Sieyuan. Sieyuan JIANGSU SIEYUAN HERTZ INSTRUMENT TRANSFORMER CO., LTD.

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1 ! Sieyuan Address: No. 5, West Huimin Road, Economic Development Zone, Rugao, Jiangsu Province, P.R.China. Zip code: Tel: Fax: JIANGSU SIEYUAN HERTZ INSTRUMENT TRANSFORMER CO.,LTD.

2 Company Brief Jiangsu Sieyuan Hertz Instrument Transformer Co., Ltd. ( ) covers the land area of more than 100,000 square meters and the construction area of over 60,000 square meters, which is within the factory area of more than 50,000 square meters. With a sealing & purifying workshop up to 100,000 grade, it is regarded as a world-class instrument transformer production base in China. Sieyuan Hertz has a R&D and management team with the most competitive power, it now has more than 400 employees, among the employees, the percent of engineering and technology talents who got Ph. D or master degree or graduated from universities is 45%, and the Company also invites foreign professionals to take charge of the technology and quality management. Jiangsu Sieyuan Hertz Instrument Transformer Co., Ltd. conducts research and development on technically advanced and safe quality products on its own, including: kv Oil Impregnated Inverted Current Transformers, kv Sulfur Hexafluoride Gas Insulated Inverted Current Transformers, kv Capacitor Voltage Transformers, kv Sulfur Hexafluoride Gas Insulated Voltage Transformers for mounting in GIS, 5- kv Inductive Voltage Transformers, 10- kv Oil Impregnated Tank type Current Transformers, kv Dry type Current Transformers and Dry Graded Wall Bushing, etc. The products have obtained KEMA test certification in Holland, as well as inspection and examination Comp any Brief by national authorities. Sieyuan Hertz leads the instrument transformer trade to a higher level at a sustained speed, with ardent enthusiasm, prudent attitude and customer orientation. Sieyuan Hertz leads the instrument transformer trade to a higher level at a sustained speed, with ardent enthusiasm, prudent attitude and customer orientation. 1 2

3 Advanced Facilities World Class Testing Condition In order to realize the product design concept and reduce the uncertainty brought by manual operation, during the production process, Siyuan Hertz adopts automatic production equipments. Sieyuan Hertz has the world-classy testing conditions and perfect testing equipments, including three six-facet shielding high voltage testing laboratory with the rated voltage 1000 kilovolt, 600 kilovolt, 00 kilovolt and also an impulse voltage generator up to 000 kilovolt with automatic measuring system. In the profession field, the company introduces firstly the partial discharge test in power frequency withstand voltage, which is more stringent than national and IEC standards, and ensures much more reliance and safety for product running. German Leybold Vacuum Treatment System 600kV Power Frequency Testing Transformer 00kV Power Frequency Testing Transformer High Frequency Capacitance and Stray Capacitance Meter German B&R Aptitude Coil Machine Assembly Shop for SF6 Gas Insulated Current Transformer Capacitance Graded Bushings Winding Machine for SF6 Gas Insulated Products Ferro-resonance Testing Analysis System for Capacitor Voltage Transformer (CVT) Secondary Coil Winding Machine Capacitance Graded Bushings Winding Machines German Welding Robots 1000kV Power Frequency Testing Transformer 000kV Lightning Impulse Generator Transient Characteristics Tester for Current Transformer 4

4 Reliable Products & Quality General Customer Service ISO9000 Quality System Certificate (SGS) Sieyuan Hertz consistently follows the mission of "service creates value" by professional, speedy, sincere and quality service. We endeavor to help lower our customer' operation costs while improving their business efficiency and competitiveness. Sieyuan Hertz is committed to offer our customers with products featuring "high-safety", "highreliance", "high-accuracy" and "high-standardization". Since our foundation, the company has gained earnest support from users in all lines. At present, our sales network covers all the cities in China and overseas markets. In north, east, south, and mid China, northwest and northeast China, sales offices and after-sale service stations have been established. In addition, the company has established perfect partnership with State Grid Corporation of China, and China Southern Power Grid Co., Ltd., Sieyuan Hertz has continuously won bids in major power station projects in Vietnam, Burma and Nigeria, which marks that our products have known worldwide. Jiangsu Electric Power Corporation, China 500kV SF6 Gas Insulated Inverted Current Transformers Guangdong Electric Power Corporation, China Sieyuan Hertz promotes total quality management and strictly abiding by ISO9000 quality management system, the regulation of technical requirement is quite clear and uniform from parts inspection to routine test, so as to ensure the whole production under control and the products can be traced back. To ensure the product quality meeting international standards, all major raw materials are imported from foreign countries, such as: cable paper, semiconducting paper, aluminum foil, transformer oil, insulating material for sulfur hexafluoride gas insulated products, Zhejiang Electric Power Corporation, China 500kV Oil Impregnated Inverted Current Transformers Jiangsu Electric Power Corporation, China Nanjing Electric Power Corporation, China enameled wire and compacting material for product etc. Hebei Electric Power Corporation, China Jilin Electric Power Corporation, China Shanxi Electric Power Corporation, China Shanxi Electric Powr Corporation, China Ningxia Electric Power Corporation, China 5 6

5 LVB Series Oil Immersed Inverted Current Transformers Introduction to Structure Symbol Explanation L V B (T) == Stainless Steel Expander Primary Terminal Plate on P1 Side Oil Level Observation Window Primary Terminal Plate on P2 Side Antipollution Class (W2, W) Voltage Grade (kv) With Transient Protection With Protection Inverted Current Transformer Bushing Secondary Terminal Box Nameplate Core and winding assembly Porcelain Cover Oil Drain Value LVB (T) series current transformer has an inverted structure with oil-immersed paper insulation (Please see the left figure). It is connected in series with electric energy measurement, measuring, relay protection and transient protection functions. Primary coil has a through-type conducting rod structure with good dynamic and thermal stability; its maximum thermal current can be up to 6kA/s (when primary coil is connected in series). Primary coil passes through the center of secondary coil without flux leakage. Measurement precision can be up to 0.1and 0.2S grades. Secondary coil is fixed in an aluminum shielded-case by casting organic materials; secondary measurement and protection circuits cannot be damaged by insulation breakdown. Optimal capacitor screen bushing is made of a complete piece of imported broadsheet cable paper; it is coiled by an automatic wrapping machine which is controlled by a computer with high performance. It has a technological de-centrality and an excellent insulation property. Partial discharge test is carried out under power frequency test voltage. Use the automatic vacuum drying treatment system produced by LEYBOLD in Germany, carry out pressure-changing vacuum drying treatment and oiling after a product is assembled completely, and all insulation materials are imported from foreign countries. All these ensure that the dielectric dissipation factor of complete product tan_ is less than 0.%. External insulation uses a porcelain cover with high strength, optimal surface field intensity together with lower field intensity of internal bushing make the porcelain cover avoid explosion. Secondary outlet box is a complete structure by casting the aluminum alloy; its sealing structure meets the requirement of IP55, which is dust proof, water proof and air permeable; secondary terminal for wiring uses Phoenix special terminal; it is more convenient for operations such as plug-in, pull-out and wiring etc. Connection between components uses argon-arc welding, fill in high pressure nitrogen to detect leakage after assembly is complete, so oil penetration and oil leakage caused by oil-immersed products are resolved at root. Use an aluminum alloy cast case, all components including the base, connection box, stainless steel expander, and nameplate etc do not rust forever. It is light and handy with a small volume and light weight. This product is free-maintenance. 7 8

6 Technical Parameters of LVB (T) - 5 Type LVB-5W2/1X LVB(T)-5W2/2X LVB-5W/1X LVB(T)-5W/2X Highest voltage for equipment kv 40.5 Rated frequency Hz 50/60 Rated power-frequency withstand voltage (rms) kv 95 Rated lightning impulse withstand voltage(full wave)(peak)kv 200 Rated lightning impulse withstand voltage (Chopped wave) (Peak) kv 20 Flashover distance mm 500 Creepage distance mm 1015/1260 Rated primary current (Maximum) A 4000(8000) Rated secondary current A 1; 5 Accuracy classes (they can be combined if necessary) 0.1;0.2;0.5;0.2S;0.5S;5P;10P;TPY;TPS Rated output VA Safety factor FS 5;10 Accuracy limit factor ALF 10; 15; 20; 0 Short-time thermal current (Maximum) ka 6kA/s (In series) Dynamic current (Maximum) ka 160 Allowable mechanical load of transformer (Static) N 000 Allowable mechanical load of transformer (Dynamic) N 5000 Net weight kg Note: 1 The Company reserves the right to change the parameters in the table. There are several current ratios for one-time switch of the transformer. Technical Parameters of LVB 66 Type LVB-66W2/1X LVB-66W/2X LVB-66W/1X LVB-66W/2X Highest voltage for equipment kv 72.5 Rated frequency Hz 50/60 Rated power-frquency withstand voltage (rms) kv 160 Rated lightning impulse withstand voltage (full wave)(peak) kv 50 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 40 Flashover distance mm 700 Creepage distance mm 1812/2250 Rated primary current (Maximum) A 4000 Rated secondary current A 1; 5 Accuracy classes (they can be combined if necessary) 0.1; 0.2; 0.5; 0.2S;0.5S;5P;10P;TPU;TPS Rated output VA Safety factor FS 5; 10 Accuracy limit factor ALF 10; 15; 20; 0 Short-time thermal current (Maximum) ka 6kA/s (In series) Dynamic current (Maximum) ka 160 Allowable mechanical load of transformer: Static N 000 Allowable mechanical load of transformer: Dynamic N 5000 Net weight kg Note: 1 The parameters in the table are not changeless; the Company reserves the right to change them. There are several current ratios for one-time switch of the transformer. LVB-5W2/1X LVB-5W/1X LVB(T)-5W2/2X LVB(T)-5W/2X LVB-66W2/1X LVB-66W/1X LVB-66W2/2X LVB-66W/2X 9 10

7 Technical Parameters of LVB-110 Type LVB-110W2/1X LVB-110W2/2X LVB-110W2/X LVB-110W/1X LVB-110W/2X LVB-110W/X Highest voltage for equipment kv 126 Rated frequency Hz 50/60 Rated power-frequency withstand voltage (rms) kv 20 Rated lightning impulse withstand voltage (full wave)(peak) kv 550 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 6 Flashover distance mm 1200 Creepage distance mm 150/910 Rated primary current (Maximum) A 4000 Rated secondary current A 1;5 Accuracy classes (they can be combined if necessary) 0.1; 0.2; 0.5; 0.2S; 0.5S; 5P; 10P; TPY; TPS Rated output VA 10~50 Safety factor FS 5; 10 Accuracy limit factor ALF 10; 15; 20; 0 Short-time thermal current (Maximum) ka 50kA/s (In series) Dynamic current (Maximum) ka 125 Allowable mechanical load of transformer (Static) N 000 Allowable mechanical load of transformer (Dynamic) N 5000 Net weight kg Note: 1 The Company reserves the right to change the parameters in the table. There are several current ratios for one-time switch of the transformer. Technical Parameters of LVB-12 LVB-110(12)W2/1X LVB-110(12)W/1X Type LVB-12W2/1X LVB-12W2/2X LVB-12W2/X LVB-12W/1X LVB-12W/2X LVB-12W/X Highest voltage for equipment kv 145 Rated frequency Hz 50/60 Rated power-frequency withstand voltage (rms) kv 275 Rated lightning impulse withstand voltage (full wave)(peak) kv 650 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 748 Flashover distance mm 1200 Creepage distance mm 625/4495 Rated primary current (Maximum) A 4000 Rated secondary current A 1;5 Accuracy classes (they can be combined if necessary) 0.1; 0.2; 0.5; 0.2S; 0.5S; 5P; 10P; TPY; TPS Rated output VA 10~50 Safety factor FS 5; 10 Accuracy limit factor ALF 10; 15; 20; 0 Short-time thermal current (Maximum) ka 50kA/s (In series) Dynamic current (Maximum) ka 125 Allowable mechanical load of transformer (Static) N 000 Allowable mechanical load of transformer (Dynamic) N 5000 Net weight kg Note: 1 The Company reserves the right to change the parameters in the table. There are several current ratios for one-time switch of the transformer. LVB-110(12)W2/2X LVB-110(12)W/2X LVB-110(12)W2/X LVB-110(12)W/X 11 12

8 Technical Parameters of LVB (T)- Type LVB-W2/2X LVB (T)-W2/X LVB-W/2X LVB (T)-W/X Highest voltage for equipment kv 252 Rated frequency Hz 50/60 Rated power-frequency withstand voltage (rms) kv 460 Rated lightning impulse withstand voltage (full wave)(peak) kv 1050 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 1208 Flashover distance mm 0 Creepage distance mm 600/7900 Rated primary current (Maximum) A 4000 Rated secondary current A 1 5 Accuracy classes (they can be combined if necessary) 0.1; 0.2; 0.5; 0.2S; 0.5S; 5P; 10P; TPY; TPS Rated output VA 10~50 Safety factor FS 5; 10 Accuracy limit factor ALF 10; 15; 20; 0 Short-time thermal current (Maximum) ka 6kA/s (In series) Dynamic current (Maximum) ka 160 Allowable mechanical load of transformer: Static N 4000 Allowable mechanical load of transformer: Dynamic N 6000 Net weight kg Note: 1 The Company reserves the right to change the parameters in the table. There are several current ratios for one-time switch of the transformer. Technical Parameters of LVB (T) Type LVB (T) -0W2 LVB (T) -500W2 Highest voltage for equipment kv Rated frequency Hz 50/60 Rated power-frequency withstand voltage (rms) kv Rated lightning impulse withstand voltage (full wave)(peak) kv Rated lightning impulse withstand voltage (chopped wave)(peak) kv Impulse withstand voltage (Wet Test) kv Flashover distance mm Creepage distance mm Rated primary current (Maximum) A Rated secondary current A 5; 1 5; 1 Accuracy classes (they can be combined if necessary) 0.2S; 0.5S; 0.1; 0.2S; 0.5S; 0.1; 0.2; 0.5; 5P; 10P; TPY 0.2; 0.5; 5P; 10P; TPY Rated output VA 10~50 10~50 Safety factor FS 5; 10 5; 10 Accuracy limit factor ALF 10; 15; 20; 0; 40 10; 15; 20; 0; 40 Times of symmetry short-circuit current Kssc 10, 15, 20, 25, 0 TPY Parameter Operating cycle C-O-C-O Output capacity VA 10, 15 Thermal current (Maximum) ka 6 ka / s ( in series ) Dynamic current (Maximum) ka 160 ( in series ) Weight of oil Net weight Gross weight Note: 1 The Company reserves the right to change the parameters in the table. There are several current ratios for one-time switch of the transformer. Outline and dimensional drawings for Outline and dimensional drawings for LVB-W2/1X LVB-W/1X LVB-W2/2X LVB-W/2X LVB(T)-0W2 Current Transformer LVB(T)-500W2 Current Transformer 1 14

9 LVQB Series SF6 Gas-insulated Inverted Current Transformer Introduction to Structure Symbol Explanation L V Q B (T) Shell Rupture Disc Main Body Conducting Block Antipollution Class (W2, W) Voltage Grade (kv) With Transient protection With Protection SF6 Gas-insulation Inverted Current Transformer Silicon Rubber Bushing Secondary Lead Pipe Outlet Box Nameplate Electrode Base LVQB series current transformer has an inverted structure with SF6 gas insulation (Please see the figure). It is connected in series with electric energy measurement, measuring, and relay protection functions. Primary coil has a through-type conducting rod structure with good dynamic and thermal stability; its maximum thermal current can be up to 6kA/s (when primary coil is connected in series). Primary coil passes through the center of secondary coil without flux leakage. Measurement precision can be up to 0.1 and 0.2S grades. Secondary coil is fixed in an aluminum shielded-case by casting organic materials; measurement and protection circuits cannot be damaged by insulation breakdown. Optimal Electrode shielded structure improves internal and external field distribution of the product. It has an excellent insulation property. Partial discharge test is carried out under power frequency test voltage. There are two types of external insulation bushing for customers: they have excellent explosion-resistant and shockresistant behaviors. External bushing uses silicon rubber umbrella type apron reinforced by glass fiber. Optimal external surface field makes silicon rubber avoid electrical erosion. Porcelain bushing shell with high-strength. Secondary outlet box is a complete structure by casting the aluminum alloy; its sealing structure meets the requirement of IP55, which is dust proof, water proof and air permeable; secondary terminal for wiring uses Phoenix special terminal; it is more convenient for operations such as plug-in, pull-out and wiring etc. Seal ring is made of imported fluorocarbon silicone rubber, it is suitable for using in the area where there is great temperature change or the environmental temperature is extreme. The leakage rate per year is less than 0.5%. Product performance keeps changeless after severe transporting test. Use an aluminum alloy cast case, all components including the base, connection box, stainless steel expander, and nameplate etc do not rust forever. A density meter is installed on the base, this meter can show the gas pressure and density in the transformer (The show value is turned to be the internal gas pressure at 20 automatically). A signal for refilling gas is sent out when the pressure in the transformer drops down to the alarm pressure

10 Technical Parameters of LVQB-66 Type LVQB-66W2 LVQB-66W Highest voltage for Equipment kv 72.5 Rated Frequency Hz 50/60 Rated power-frequency withstand voltage (rms) kv 160 Rated lightning impulse withstand voltage (full wave)(peak) kv 50 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 40 Flashover Distance mm 650 Creepage Distance mm 1812, 2250 Rated Primary Current In (Maximum) A 4000 Rated Secondary Current A 1; 5 Accuracy Classes (They can be combined if necessary) 0.1; 0.2; 0.5; 0.2S; 0.5S; 5P; 10P Rated Output VA 10~50 Safety Factor FS 5; 10 Accuracy Limit Factor ALF 10; 15; 20; 0 Thermal Current (Maximum) ka 50kA/s (In series) Dynamic Current (Maximum) ka 125 Air Pressure (Absolute Value) MPa 0.5 Outline and Installation Dimensions Fig.1 Net Weight kg 400 Gross Weight kg 490 Note: 1 The parameters in the table are not changeless; the Company reserves the right to change them. There are several current ratios for one-time switch of the transformer. Technical Parameters of LVQB-110 Type LVQB-110W2/1X LVQB-110W2/2X LVQB-110W/1X LVQB-110W/2X Highest Voltage for Equipment kv 126 Rated Frequency Hz 50 Rated power-frequency withstand voltage (rms) kv 20 Rated lightning impulse withstand voltage (full wave)(peak) kv 550 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 6 Flashover Distance mm 1100 Creepage Distance mm 150, 950 Rated Primary Current In (Maximum) A 2400 (1:2; 1:2:4 available) Rated Secondary Current A 1; 5 Accuracy Classes (They can be combined if necessary) 0.1; 0.2; 0.5; 0.2S; 0.5S; 5P; 10P Rated Output VA 10~50 Safety Factor FS 5; 10 Accuracy limit Factor ALF 10; 15; 20; 0 Thermal Current (Maximum) ka 50kA/s Dynamic Current (Maximum) ka 125 Air Pressure (Absolute value) MPa 0.5 Outline and Installation Dimensions Fig.2 Net Weight kg Gross Weight kg Note: 1 The Company reserves the right to change the parameters in the table. There are several current ratios for one-time switch of the transformer. Fig.1 LVQB-66W2 LVQB-110W2/1X LVQB-110W/1X Fig. 2 LVQB-110W2/2X LVQB-110W/2X 17 18

11 Technical Parameters of LVQB- Type LVQB-W2/1X LVQB(T)-W2/2X LVQB-W/1X LVQB(T)-W/2X Highest voltage for equipment kv 252 Rated frequency Hz 50 Rated power-frequency withstand voltage (rms) kv 460 Rated lightning impulse withstand voltage (full wave)(peak) kv 1050 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 1208 Flashover distance mm 2250 Creepage distance mm 600, 7900 Rated primary current In (Maximum) A 4000 Rated secondary current A 1; 5 Accuracy classes (they can be combined if necessary) 0.1;0.2;0.5;0.2S;0.5S;5P;10P 0.1;0.2;0.5;0.2S;0.5S5P;10PTPY;TPS Rated output VA 10~50 Safety factor FS 5; 10 Accuracy limit factor ALF 10; 15; 20; 0 Thermal current (Maximum) ka 6kA/s Dynamic current (Maximum) ka 160 Rated gas pressure (Absolute value) MPa 0.5 Outline and installation dimensions Fig. Net weight kg Gross weight kg Note: 1 The Company reserves the right to change the parameters in the table. There are several current ratios for one-time switch of the transformer. Technical Parameters of LVB (T) Type LVQB(T)-0W LVQB(T) -500W Highest voltage for equipment kv Rated frequency Hz 50/60 Rated power-frequency withstand voltage (rms) kv 510/ Rated lightning impulse withstand voltage (full wave)(peak) kv 1175/ Rated lightning impulse withstand voltage (chopped wave)(peak) kv 152/ Impulse withstand voltage (Wet Test) kv 950/ Flashover distance mm Creepage distance mm Rated primary current (Maximum) A 5000(2 2500) 5000(2 2500) Rated secondary current A 5; 1 5; 1 Accuracy classes (they can be combined if necessary) 0.2S;0.5S;0.1;0.2; 0.2S;0.5S;0.1;0.2; 0.5;5P;10P;TPY 0.5;5P;10P;TPY Rated output VA 10~50 10~50 Safety factor FS 5; 10 5; 10 Accuracy limit factor ALF 10; 15; 20; 0; 40 10; 15; 20; 0; 40 Times of symmetry short-circuit current Kssc 10, 15, 20, 25, 0 TPY Parameter Operating cycle C - O - C - O Output capacity VA 10, 15 Thermal current (Maximum) ka 6 ka / s ( in series ) Dynamic current (Maximum) ka 160 ( in series ) Weight of oil Net weight Gross weight Note: 1 The Company reserves the right to change the parameters in the table. There are several current ratios for one-time switch of the transformer. Outline and dimensional drawings for Outline and dimensional drawings for LVQB-W2/1X LVQB-W/1X Fig. LVQB(T)-W2/2X LVQB(T)-W/2X LVQB(T)-0W Current Transformer LVQB(T)-500W Current Transformer 19 20

12 JDQXF Series SF6 Gas-insulated Voltage Transformer Symbol Explanation J D Q X F Antipollution Class W2 or W Rated Voltage Grade Measurement Coil and Protection Coil Being Separate With Residual Voltage Coil Gas-insulation Single Phase Voltage Transformer Introduction to Structure Transformer cabinet is at the bottom of product, main body is in it, there is a silicon rubber composite insulation bushing or high Explosion Resistant Device strength porcelain bushing at the middle and primary terminals are at top both sides of product. Primary Terminal Block A SF6 gas density controller is equipped on the transformer cabinet; it can monitor the SF6 gas pressure in-line. There is a pressure-relief device on the top; the rupture (relief) pressure is 0. Silicon Rubber Insulated Bushing 7 MPa without oil or explosion risk, and it is free-maintenance. Main body is inside the cabinet, use the composite insulation of polyester film and SF6 as interlayer insulation, so it has high Bushing Electrode strength insulation. Coil uses single-staged tower structure, so it Primary Conducting Pipe has a good shock resistant performance. Product shell is carried out hot galvanizing or uses cast aluminum Main Body alloy, all components including stainless steel fasteners and nameplate etc work in outdoor for long time without rust. Cabinet Primary terminal block uses cast aluminum part, the static test Secondary Outlet Box load it can bear is no less than 000N. Secondary outlet box is a complete structure by casting the aluminum alloy; its sealing structure meets the requirement of IP55, which is dust proof, water proof and air permeable; secondary terminal for wiring uses Phoenix special terminal; it is more convenient for operations such as plug-in, pull-out and wiring etc. Optimal Electrode shielded structure improves internal and external field distribution of the product. It has an excellent insulation property. Partial discharge test is carried out under power frequency test voltage. Seal ring is made of imported fluorocarbon silicone rubber, it is suitable for using in the area where there is great temperature change or the environmental temperature is extreme. The leakage rate per year is less than 0.5%. High voltage coil is made of imported polyester film and conducting wires with high insulation strength and stable performance; use imported automatic winding equipment to complete the wire winding and the wrapping of interlayer insulation automatically according to entered instructions. It can be designed and made with three coils (one primary coil, one secondary coil and one residual voltage coil) or four coils (one primary coil, two secondary coils and one residual voltage coil) according to the requirement of customer. Integrated design is reasonable; it shows capacitive character under certain voltage. Technical Parameters Type JDQXF-110W2 / JDQXF-110W Highest voltage for equipment kv 126 Rated frequency Hz 50 Rated power-frequency withstand voltage (rms) kv 20 Rated lightning impulse withstand voltage (full wave)(peak) kv 550 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 6 Flashover distance mm 1160 Creepage distance mm 150 / 950 Rated gas pressure (Absolute value) MPa 0.5 Rated voltage factor/time1.2/continual 1.5/0s Accuracy class and rated output Secondary coil 1 Secondary coil 2 Residual voltage coil Accuracy class orP P Rated output VA Thermal limit output VA 2000 Outline and installation dimensions See the figure Net weight kg 450 Gross weight kg 550 Note: 1 The Company reserves the right to change the parameters in the table. We also can provide with products which meet the requirement of IEC and ANSI. JDQXF-110W

13 GIS Gas-insulated Voltage Transformer Symbol Explanation Leading wire of secondary coil and leading wire of ground terminal of primary coil are connected with Phoenix special terminal in the secondary terminal box via the terminal block cast as a whole with epoxy on the shell. It is more convenient for operations such as plug-in, pull-out and wiring etc. The sealing performance meets the requirement of IP55. The transformer can be installed horizontally or vertically. J D Q X F Technical Parameters Introduction to Structure Voltage transformer matched with GIS is used for SF6 close combined apparatus; it is connected between the phase and ground. It uses SF6 gas as main insulation, and uses polyester film, which is used for interlayer insulation, as additional insulation. Main components of transformer There are lifting blocks, a ground terminal, a nameplate, an instruction plate and a secondary terminal box on the metal shell. The shell body is formed by welding steel plates and hot galvanizing, all connecting bolts uses stainless standard parts, they can work in outdoor place for long time, and do not rust forever. A metal rupture disc is installed on the base. If a high energy discharge occurs in it, the rupture disc will break to relief pressure, so the safety of product is improved. Main body is installed in the shell, high voltage electrode Outlet Box Core and Winding Assembly Conduit Rated Voltage Measurement Coil and Protection Coil Being Separate With Residual Voltage Coil Gas-insulation D for Single Phase; S for Three Phases Voltage Transformer Secondary Insulator Explosion Resistant Device Supporting rack Shell Charging Connection Lifting Block Grounding Base and low voltage shielded plate use aluminum plates, which are rotated and pressed to form and carried out polishing treatment. Optimal Electrode shielded structure improves internal and external field distribution of the product. It has an excellent insulation property. Partial discharge test is carried out under power frequency test voltage. High voltage coil uses single-staged tower structure, so it has a good shock resistant performance. Use imported polyester films and high strength enameled wires, so it has high insulation strength. Use imported automatic winding equipment to complete the wire winding and the wrapping of interlayer insulation automatically according to entered instructions. It can be designed and made with three coils (one primary coil, one secondary coil and one residual voltage coil) or four coils (one primary coil, two secondary coils and one residual voltage coil) according to the requirement of customer. Disc insulator is used as the partition between the gas chamber of transformer and that of composite apparatus. Transformer and composite apparatus can have SF6 gas with different pressure. The connection between high voltage conductor and high voltage electrode on main body uses elastic structure. Type JDQXF-110ZH Highest voltage for equipment kv 126/145 Rated frequency Hz 50/60 Rated power-frequency withstand voltage (rms) kv 20/275 Rated lightning impulse withstand voltage (full wave)(peak) kv 550/650 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 6/748 Rated gas pressure (Absol ute value) MPa 0.5/0.6 Rated voltage factor/time 1.2/continual 1.5/0s Accuracy class and rated output Secondary coil 1 Secondary coil 2 Residual voltage coil Accuracy class orP P Rated output VA Thermal limit output VA 2000 Outline and installation dimensions See the figure Net weight kg 400 Gross weight kg 500 Note: 1 The Company reserves the right to change the parameters in the table. We also can provide with products which meet the requirement of IEC and ANSI. 2 24

14 LB6-110 type Current Transformer Symbol Explanation L B Voltage Grade, kv Design No. With Protection Current Transformer Except for the above basic symbol, suffix W2 means that it is suitable for using in Grade area, suffix W means that it is suitable for using in Grade area, and suffix GY means that it is suitable for using in plateau area. Introduction to Structure LB6-110 type current transformer has an oil-immersed fullysealed structure. The primary coil is U-shape, the main body is fixed on the bracket, the main insulation uses capacitor type oilpaper, use the high voltage cable paper to wrap the core of primary coil, and set up several capacitor shields among it, the internal shield is connected to high potential, and the external shield is connected to ground reliably. There is a porcelain bushing at the upper part of oil tank, and an oil conservator is set up on top of porcelain bushing, primary outlet terminal is on the oil conservator, series-parallel connection uses an external switch device, i.e., the switching operation is carried out outside the oil conservator. Use a stainless steel expander as the oil compensation device to ensure oil quality. Oil level is indicated by the pointer at the upper window of expander. Main technical Parameters Type LB6-110(W2) LB6-110(W) GY Rated primary voltage kv 110 Highest Voltage for Equipment kv 126 Rated frequency Hz 50/60 Rated power-frequency withstand voltage (rms) kv 20 Rated lightning impulse withstand voltage (full wave)(peak) kv 550 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 6 Flashover distance mm 1000 Creepage distance mm 150, 906 Rated primary current In (Maximum) A 2 50~ Rated secondary current A 1; 5 Accuracy classes (they can be combined if necessary) 0.2; 0.5; 0.2S; 0.5S; 5P; 10P Rated output (Maximum) VA 50 (Pigtail 0) Safety factor FS 5; 10 Accuracy limit factor ALF 10; 15; 20; 0 Short-time thermal current (depend on the number of turns of primary and secondary coils) ka 1.5~45kA / 1s Dynamic current (Maximum) ka 80~115 Allowable mechanical load of transformer: Static 2000N Outline and installation dimensions Fig.1 Net weight kg Gross weight kg Note: 1 The parameters in the table are not changeless; the Company reserves the right to change them. There are several current ratios for one-time switch of the transformer. A nameplate is set up on the oil tank to show the technical data. There are four lifting blocks for hoisting, an oil-discharge valve and earthing bolts at the bottom of oil tank. The product can have four to six secondary coils, the secondary measurement coil is made by microcrystalline alloy with high magnetic conductivity, thus can ensure that the measurement precision reaches up to 0.2 grade or 0.2S grade A or above current transformer has a pigtail at measurement secondary coil, in order to get two current ratios. Use new technology and new materials such as hot galvanizing or stainless steel standard parts etc for outside of the product to make complete equipment rustless. Reasonable and originative structure as well as advanced technology ensures that the product runs reliably, safely and durably. Fig.1 Outline and Installation Dimensions of LB6-110 type Current Transformer (Primary Coil is in series) 25 26

15 LB7- type Current Transformer Symbol Explanation L B 7 Voltage Grade, kv Design No. With Protection Current Transformer Except for the above basic symbol, suffix W2 means that it is suitable for using in Grade area, suffix W means that it is suitable for using in Grade area, and suffix GY means that it is suitable for using in plateau area. Introduction to Product This product has an oil-immersed fully-sealed structure. It consists of metal expander, oil conservator, main body and other accessories. The primary coil is U-shape, the main insulation uses capacitor type oilpaper, use the high voltage cable paper to wrap the core of primary coil, and set up several main shields among it. The secondary coil is set up at the lower part of primary coil; the whole main body is fixed in the oil tank. There is a bushing at upper part of oil tank, and an oil conservator is set up on top of bushing, the primary wire is lead out via the hole of oil conservator, the seriesparallel switching operation is carried out outside the oil conservator. Use a stainless steel expander as the oil compensation device to ensure oil quality. Oil level is indicated by the pointer at the upper window of expander. A nameplate showing the technical data and a description plate showing the coils arrangement schematic diagram are set up on the oil tank. There are four holes or lifting blocks on the under-frame for hoisting the product, and an oil-discharge valve and earthing bolts at bottom of oil tank. The product can have five or six secondary coils, the secondary measurement coil is made by microcrystalline alloy with high magnetic conductivity, thus can ensure that the measurement precision reaches up to 0.2 grade or 0.2S grade. The secondary terminal has limit and double sealing functions. The outlet box is made by stretching wholly; it is elaborate and practical. The oil tank is carried out surface treatment; it is bright and durable. Complete transformer is fully sealed. New technology and new materials such as hot galvanizing or stainless steel standard parts etc are used for outside of the product to prevent from rustless and get long working life. Reasonable and originative structure as well as advanced technology ensures that the product runs reliably, safely and durably. Technical Parameters of LB7- Type LB7- Highest Voltage for Equipment kv 252 Rated frequency Hz 50/60 Rated power-frequency withstand voltage (rms) kv 460 Rated lightning impulse withstand voltage (full wave)(peak) kv 1050 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 1208 Flashover distance mm 0 Creepage distance mm 600 W2) 7900 W Rated primary current (Maximum) A Rated secondary current A 1; 5 Accuracy classes (they can be combined if necessary) 0.2; 0.5; 0.2S; 0.5S; 5P; 10P Rated output VA 10~50 Safety factor FS 5; 10 Accuracy limit factor ALF 10; 15; 20; 0 Short-time thermal current (Maximum) ka 50kA/s (In series) Dynamic current (Maximum) ka 125 Allowable mechanical load of transformer (Static) N 000 Net weight kg 1180 Note: 1 The Company reserves the right to change the parameters in the table. There are several current ratios for one-time switch of the transformer. s for LB7- type Current Transformer 27 28

16 LAB6-5 type Current Transformer Main Technical Parameters Type LAB6-5 Rated primary voltage kv 5 Highest voltage for the equipment kv 40.5 Rated frequency Hz 50 Rated power-frequency withstand voltage (rms) kv 95 Rated lightning impulse withstand voltage (full wave)(peak) 185 Flashover distance mm 450 Creepage distance mm Rated primary current A Rated secondary current A 1; 5 Accuracy classes (they can be combined if necessary) 40. 2; 0.5; 0.2S; 0.5S; 5P; 10P Rated output VA 10~40 Safety factor FS 10 Accuracy limit factor ALF 10; 15; 20; 0 Thermal current (Maximum) ka 40 ka/ 1s Dynamic current (Maximum) ka 100 Symbol explanation L A B 6 5 Voltage Grade, kv Design No. With Protection Chain type Current Transformer Except for the above basic symbol, suffix W2 means that it is suitable for using in Grade polluted area, suffix W means that it is suitable for using in Grade polluted area. Introduction to product LAB6-5 type current transformer uses oilpaper insulation for outdoor use, it is a fully sealed product. It is used as a current, electric energy measurement and relay protective device for AC power system with highest voltage for the equipment of the equipment 40.5 kv and rated frequency 50Hz. The product can have three or four secondary coils, the magnetic core uses microcrystalline alloy with high magnetic conductivity, the measurement precision of secondary coil can be up to 0.2 grade or 0.2S grade. The oil conservator of this product is made of aluminum alloy. The oil tank is made by high-quality steel plate stretching to form as a whole, in order to reduce welding seam leakage points; it has not exposed sealing structure, so it can lengthen the aging period of seal ring, ensure that the sealing performance is reliable, improve the run quality of insulation oil, and ensure that the run is safe and reliable. for LAB6-5 type Current Transformer with Expander 29 0

17 LGBJ type Current Transformer Technical Parameters of LGBJ-5 Current Transformer Type LGBJ-5W2 LGBJ-5W Symbol explanation L G B J 110 GY W2 Antipollution Class Tableland type Voltage Class, kv With High Insulation With Protection Dry type Current Transformer Introduction to Product This product uses the capacitor equalizing theory; it uses optimal structural design by special electric field analysis and calculation; it is light and handy, and it is convenient for installation. The product is made of fire resistant and corrosion resistant material without oil or porcelain. It not only can be used in the city with high sanitary requirement, but also can be used in the area with severe pollution. This series product consists of primary coil, secondary coil, shell and base plate etc components. The secondary coil is set up at the bottom; it is covered by shell completely to prevent from dust and outer matters entering, and prevent from being corroded by sand blown by wind. The end shield or ground shield is led out separately to be convenient for test, and it also has good humidity resistance. The insulation resistance is stable and reliable. The secondary terminal block uses cast as a whole. This is a patented product of our company, and the patent No. is ZL This product uses organic composite material as its main insulation, so it has a long working life, and can be up to 0 years. No oil: there is not explosion risk, it is safe and does not leak forever. No porcelain: small and light. No gas: there is not possibility to pollute environment. Non-epoxy cast: it is used in the open air, it is stable and reliable. Advanced technology: use the optimal design concept with uniform voltage distribution; partial discharge is small and dielectric loss factor is low. Use special technology, carry out 1% NaCl water cooking test for 42 hours, the data do not change obviously before and after the test. The primary terminal uses copper or aluminium; it is led out horizontally, so it is convenient for wiring. Highest voltage for the equipment kv 40.5 Rated frequency Hz 50 Rated power-frequency withstand voltage (rms) kv 95 Rated lightning impulse withstand voltage (full wave)(peak)kv 200 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 20 Flashover distance mm 80 Creepage distance mm 1020/1260 Rated primary current (Maximum) A 2000 Rated secondary current A 1; 5 Accuracy classes (they can be combined if necessary) 0.2; 0.5; 0.2S; 0.5S; 5P; 10P Rated output VA 10~50 Safety factor FS 5; 10 Accuracy limit factor ALF 10; 15; 20; 0 Short-time thermal current (depend on the number of turns of 50kA/s (In series) primary and secondary coils) Maximum ka Dynamic Current (Maximum) ka 125 Allowable mechanical load of transformer: Static 2000N Outline and installation dimensions Fig.1 Net weight kg 100 Gross weight kg 120 Note: 1 The parameters in the table are not changeless; the Company reserves the right to change them. There are several current ratios for one-time switch of the transformer. for LGBJ-5 type Current Transformer 1 2

18 Technical Parameters of LGBJ-66 type Current Transformer Type LGBJ-66W2 LGBJ-66W Highest voltage for the equipment kv 72.5 Rated frequency Hz 50 Rated power-frequency withstand voltage (rms) kv 140 Rated lightning impulse withstand voltage (full wave)(peak) kv 25 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 74 Flashover distance mm 700 Creepage distance mm 1820/2250 Rated primary current (Maximum) A 1250 Rated secondary current A 1; 5 Accuracy classes (they can be combined if necessary) 0.2; 0.5; 0.2S; 0.5S; 5P; 10P Rated output VA 10~50 Safety factor FS 5; 10 Accuracy limit factor ALF 10; 15; 20; 0 Short-time thermal current (depend on the number of turns of primary 50kA/s (In series) and secondary coils) (Maximum) ka Dynamic current (Maximum) ka 125 Allowable mechanical load of transformer: Static N 2000N Net weight kg Gross weight kg 20 Note: 1 The parameters in the table are not changeless; the Company reserves the right to change them. There are several current ratios for one-time switch of the transformer. Technical Parameters of LGBJ-110 type Current Transformer Type LGBJ -110W2 LGBJ -110W Highest voltage for the equipment kv 126 Rated frequency Hz 50 Rated power-frequency withstand voltage (rms) kv 20 Rated lightning impulse withstand voltage (full wave)(peak) kv 550 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 6 Flashover distance mm 1000 Creepage distance mm 150/910 Rated primary current (Maximum) A 2000 Rated secondary current A 1; 5 Accuracy classes (they can be combined if necessary) 0.2; 0.5; 0.2S; 0.5S; 5P; 10P Rated output VA 10~50 Safety factor FS 5; 10 Accuracy limit factor ALF 10; 15; 20; 0 Short-time thermal current (depend on the number of turns of primary and 50kA/s (In series) secondary coils) (Maximum) ka Dynamic current (Maximum) ka 125 Allowable mechanical load of transformer: Static N 2000N Outline and installation dimensions Fig. Net weight kg 00 Gross weight kg 50 Note: 1 The parameters in the table are not changeless; the Company reserves the right to change them. There are several current ratios for one-time switch of the transformer. for LGBJ-66 type Current Transformer for LGBJ-110 type Current Transformer 4

19 JDC6-110 and JDCF-110 type Inductive Voltage Transformers Main Technical Parameters Symbol explanation J D C W Anti Fouling Rated Voltage, kv Design Number With Residual Voltage Winding in Cascade Stage Single Phase Voltage Transformer Type JDC6-110 JDCF-110 Highest voltage for equipment kv 126 Rated frequency Hz 50 Rated power-frequency withstand voltage (rms) kv 200 Rated lightning impulse withstand voltage (full wave)(peak) kv 480 Flashover distance mm 552 Creepage distance mm 150/910 Rated voltage factor 1.2/ continual 1.5/ 0s 1.2/ continual 1.5/ 0s Rated voltage ratio 110/ /0.1/ / / /0.1/ /0.1/ /0.1 Accuracy class 0.2(0.5, P)/P 0.2/0.5/P Rated output VA 150(00,500)/00 100/250/00 Limit output VA Oil weight kg 10/165 10/165 Total weight kg 675/ /695 Note: 1 We can supply the plateau type product which is suitable for altitude 000m or above according to the requirement of customer, its technical parameters are the same as that of the product with 1mm/kV ratio of creepage distance and the highest voltage for equipment of the system; 2 We also can provide with products which meet the requirement of IEC and ANSI. J D C F 110 W Anti Fouling Rated Voltage, kv With Secondary Winding for Measurement and Protection respectively With Residual Voltage Winding in Cascade Stage Single Phase Voltage Transformer Introduction to Product JDC6-110 and JDCF-110 type voltage transformers use electromagnetic oilpaper insulation for outdoor use; it is a fully sealed product. It is used as a current, electric energy measurement and relay protective device for the system with effectively earthed neutral with the highest voltage for equipment 126 kv and rated frequency 50Hz. This product has a reliable design and low magnetic density, it can avoid ferroresonance over-voltage, the secondary coil can separate measurement from protection; the measuring precision can be up to grade 0.2 to meet the different requirement of customers and the high precision measuring requirement required by power departments. This product uses a stainless steel expander; it is carried out advanced vacuum drying and vacuum oiling treatment technology, so it has small dielectric loss and low partial discharge, and can ensure that the operation of product is safe and reliable. JDCF-110 type Inductive Voltage Transformer (Creepage Distance 25mm/kV JDCF-110 type Inductive Voltage Transformer Creepage Distance 1mm/kV 5 6

20 JD6-5 and JDX6-5 type Inductive Voltage Transformers Main Technical Parameters Type JD6-5 JDX6-5 Highest voltage for equipment kv 40.5 Rated frequency Hz 50 Rated power-frequency withstand voltage (rms) kv 95 Rated lightning impulse withstand voltage (full wave)(peak) kv 200 Rated lightning impulse withstand voltage (chopped wave)(peak) kv 20 Creepage distance 1 Rated voltage factor 1.2 continual 1.2 continual/ 1.98h Rated voltage ratio 5/0.1 5/ /0.1/ /0.1/ 5/ /0.1/ /0.1/ /0.1/ Accuracy class 0.2(0.5) 0.2(0.5)/P 0.2/1.5/P Rated output VA 80(150) 80(150)/10 0/80/1000 Limit output VA Oil weight kg Total weight kg JD6-5 JDX6-5 Symbol explanation J D (X) 6 5 W Anti Fouling Rated Voltage, kv Design Number With Residual Voltage Winding Single Phase Voltage Transformer of JD6-5W Inductive Voltage Transformer Introduction to Product JD6-5 and JDX6-5 type voltage transformers use oilpaper insulation for outdoor use; it is a fully sealed product. It is used as a current, electric energy measurement and relay protective device for the system with the highest voltage for equipment 40.5 kv and rated frequency 50Hz. JD6-5 type voltage transformer has a structure with single phase and double coils, it is suitable for connecting at the place between the phase and phase in a system with ineffectively earthed neutral. JDX6-5 type voltage transformer has a structure with single phase and triple coils; it is suitable for connecting at the place between the phase and ground in a system with ineffectively earthed neutral. The core of product uses high quality silicon steel sheets, the measuring precision can be up to grade 0.2; the oil tank has a form structure, it is formed by stretching high quality steel plate wholly to reduce the number of welding seam leakage points. The rubber ring uses double sealing to ensure that the operation of product is reliable. of JDX6-5W Inductive Voltage Transformer(Accuracy Class 0.2/0.5/P) of JDX6-5W Inductive Voltage Transformer(Accuracy Class 0.5/P) 7 8

21 TYD110/ type Capacitor Voltage Transformer Symbol explanation T YD 110/ Introduction to Product 0.01 H Anti Fouling Rated Capacitance, μf Rated Phase Voltage Capacitor Voltage Transformer Integrated Equipment Capacitor voltage transformer series products are suitable for current, electric energy measurement and relay protection in a system with effectively earthed neutral with rated voltage 5kV, 66kV, 110kV or kv and rated frequency 50Hz. It can also be used for carrier wave communication concurrently. This product consists of capacitor voltage divider and electromagnetic unit the medium voltage terminal and low voltage terminal of capacitor voltage divider are lead out into an oil tank equipped with electromagnetic unit. The electromagnetic unit consists of middle transformer, a compensation reactor and a damper The capacitor voltage divider consists of a bushing, a core and a metal expander. The core of capacitor is combined by several film-paper composite media and serial parts which are made by coiling aluminum foils, it is carried out vacuum dipping treatment, the porcelain bushing is filled with transformer oil, and it is equipped with the metal expander to compensate the change of oil volume at different temperatures. This series transformer has a quick saturation damping device with a quick transient response speed, and it also can damp ferroresonance reliably. There is a carrier wave communication terminal in the secondary outlet box, and it also has an over-voltage protection clearance. There are an oil level gauge, an outlet box, a nameplate, an oil-discharge plug and an earthing base outside the oil tank. The sealing structure of product is optimized, so it has a good sealing performance. Main technical parameters Highest Rated Primary Rated Secondary Rated Output (VA) Insulation Ratio of creepage distance S/N Type Voltage Voltage Voltage(kV) / Accuracy Class Level(kV) and Highest voltage for Weight (kv) (kv) 1a-1n 2a-2n da-dn 1a-1n 2a-2n da-dn Power Frequency/Lightnin equipment (mm/kv) (kg) 1 TYD5/ -0.02W / 0.1/ 0.1/ 0.1/ P 95/ TYD66/ -0.02W / 0.1/ 0.1/ 0.1/ P 140/ TYD110/ H / 0.1/ / / /P 200/ TYD110/ H / 0.1/ / / /P 200/ TYD110/ H / 0.1/ / / /P 200/ TYD110/ -0.01H / 0.1/ / / /P 200/ TYD110/ -0.01H / 0.1/ 0.1/ / / /P 100/P 200/ TYD110/ H / 0.1/ 0.1/ / / /P 100/P 200/ TYD110/ -0.02H / 0.1/ 0.1/ / / /P 100/P 200/ TYD/ -0.00H 252 / 0.1/ / / /P 95/ TYD/ H 252 / 0.1/ / / /P 95/ TYD/ H 252 / 0.1/ / / /P 95/ TYD/ H 252 / 0.1/ / / /P 95/ TYD/ H 252 / 0.1/ 0.1/ / / /P 100/P 95/ TYD/ H 252 / 0.1/ 0.1/ / / /P 100/P 95/ TYD/ -0.01H 252 / 0.1/ 0.1/ / / /P 100/P 95/ Note: 1 The parameters in the table are not changeless; the Company reserves the right to change them. We can supply the product with 1mm/kV ratio of creepage distance and highest voltage for equipment of the system; 4 We also can provide with products which meet the requirement of IEC and ANSI 9 40

22 CWG type Dry Wall Bushing Symbol explanation C W G / Whether used in plateau Supplemental feature code Installation mode Rated current (A) Rated voltage (kv) With current transformer Dry type Outdoor bushing Through the wall TYD5/ -0.02W type Inductive Voltage Transformers TYD5/ -0.02W type Inductive Voltage Transformers Outline and dimensional drawing of TYD-110 type voltage transformer Outline and dimensional drawing of TYD- type voltage transformer Introduction to Structure and Features This product uses the capacitor equalizing theory; it uses optimal structural design by special electric field analysis and calculation; it is light and handy, and it is convenient for installation. The product is made of fire resistant and corrosion resistant material without oil or porcelain. It not only can be used in the city with high sanitary requirement, but also can be used in the area with severe pollution. This series product consists of primary coil, bushing flanges, and terminal block etc components. The end shield or ground shield is lead out separately to be convenient for test, and it also has good humidity resistance. The insulation resistance is stable and reliable. The secondary terminal block is formed by casting as a whole, it can prevent from turning, so the insulation resistance is stable and reliable

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