Distribution Automation Solution SF 6 Gas Insulated Load Break Switch Pole-mounted type : PGS series (630A) DB-GS-M-630MC (Manual / Moldcon Busing Type) DB-GS-M-630TM (Manual / Terminal Busing Type) DB-GS-A-630MC (Automatic / Moldcon Bushing Type) DB-GS-A-630TM (Automatic / Terminal Bushing Type)
Overview Pole mounted SF 6 Gas Insulated Load Break Switch SF 6 gas Insulated Load Break Switch (LBS) for overhead lines operates at a voltage up to 24kV. It meets the demand for oil-less and maintenance free operation with SF 6 gas, the related parts and devices installed inside its hermetically sealed stainless steel tank. The pole-mounted LBS can be manually or motorized operated for fault isolation, remote control and automation to suit your power line requirements. The pole-mounted LBS has been fully certified in accordance with ANSI C37.71 IEC 60694(1996), IEC 60265(1998) to meet and exceed customer s requirements. Enclosure Lifting Lug & Mounting Bracket Bursting Membrane Female Receptacle (37pins) for Control Cable 1. Porcelain Bushing Operation Counter Manual Operating Handle Operation Indicator General Specification Earth Terminal Operation Locking Handle Description 24 kv class Operating Method Auto/Motorized/Manual Voltage 24 kv Current 400 A/630A Rating Frequency 50 Hz Short time Withstand Current (1 sec) 12.5 ka Making Capacity (peak) 32.5 ka Number of Making 5 times Mainly Active Load Breaking 400 A/630A Loop Current Breaking 400 A/630A Breaking Capacity Transformer Magnetizing Current 14 A Cable Charging Current (rms. Sym) 25 A Line Charging Current 1.5 A Impulse Insulation Phase to Earth 150 kv Level (1.2x50 μs ) Across Interrupter 150 kv Power Frequency Phase to Earth 60 kv Insulation Level Across Interrupter 60 kv Control Source Voltage AC 240/DC 24 V Rated Gas pressure at 20 6.5 kgf/ cm2g Endurance With Current (at rated current) 200 times Without Current 5000 times Weight Switch Body without Mounting Frames 130 kg (Auto-type) 1. Moldcone Lead Wire (EP rubber insulated copper conductor-125mm 2 or 200mm 2 ) 2
Construct Control Box All-in One Design for Distribution Automation System (DAS) 3 CT's and 6 Voltage Sensors are all fitted in DB-GS-A (Automatic type only) switching tank. These make DB- GS-A Switch to be easily applicable to DAS or SCADA System without any extra costs. DB-GS-A can be directly connected to control for remote control and tele-monitoring through DAS or locally operated by manual handle or motorized mechanism. Oil-less, Maintenance Free SF6 gas as an insulating and interrupting medium eliminates the necessity for periodical oil maintenance. Robustness and Long Life Stainless steel tank case with more than 3 mm thickness is designed for its maximum robustness and minimum welding line to minimize corrosion. The robust tulip type contact made of copper-tungsten tips ensures long contact life. Advanced TIG welding technique on stainless steel tank and double sealing technique with EPDM rubber for bushing mounting shows 0.02% gas leakage rate per year. DB-GS-A switch has so robust mechanical construction that it experienced 5,000 times mechanical operation test are guaranteed. <DB-GS-A 24kV Pole-mounted LBS Internal Structure of Interrupt Part > Fast Close/Open, Operator-independent Mechanism The simple toggle action spring mechanism shows operator-independent quick close and quick open operation (operation time below 0.7 sec in electrical manipulation). Driving motor is coupled with manual operating handle through the medium of one way rotating bearing. Even in case, therefore, driving motor gets out of order, manual operation is guaranteed. Reliable Insulation and Interrupting Capacity Experienced and mastery breaking part design including pure puffer principle makes the arcing time just half a cycle. Due to this, decomposition of SF6 gas from the arc is negligible and the insulation capacity of SF6 gas doesn t decrease during all service life. In the design of breaking part, all insulation and interrupting ratings of the switch are guaranteed at atmospheric gas pressure (0.35 kgf/cm 2 G ). The heavy-duty tulip type contacts made of coppertungsten arc resistance material ensure 5 times making current test and 200 times load current switching test. Easy-to-See Operation Indication Open/Close Indicator Operation Counter
<Bottom-side of LBS Tank> Secured Safety In the event of an internal arc fault, Safety Bursting Membrane on the side of the DB-GS-A switch tank ruptures to release over-pressure gas. This eliminates the risk of explosion or detachment from the power pole. Since DB-GS-A switch is not oil-filled, a major fire hazard is eliminated. In addition, two additional safety devices are available in the DB-GS-A switch. Firstly, Operation Locking Handle provides lockout to the operating mechanism if it is pulled down to the lock position using a hook stick. Secondly, Low Pressure Interlock or Low Pressure Sensor blocks the operating mechanism and transmits a contact signal to the controller, when the gas pressure in the tank drops down a preset value. In each case, operation of LBS is disabled on local control and remote command through RTU. <Operation Locking Handle> <Bursting Membrane> Bushing & Terminals DB-GS-A supports (insulator), Porcelain, and the line connections with Moldcone Lead Wire. <Porcelain Bushing with Moldcone Lead Wire> Ordering Information DB-GS-M Rated Short time Withstand Current (12.5kA) Rated Current (400A/630A) Operating Method (AuTo / Manual) Rated Voltage ( 24kV) Pole-mounted type 4
CONTROL : Pole-mounted LBS Control Basic functions are Fault Detection, LBS Control (Local / Remote), Status Monitoring, and Measuring of Electric Values including Harmonics. 18A-h Lead-Acid batteries and well-proven charging circuit guarantees the normal operation during 24 hours at even a faulted situation. Modem Space Control MCCB Control Control Position : Local / Remote Switch Control : Open / Close (SBO / DO) after Select FI (Fault Indication) Manual Reset, Battery Test Status Monitoring Switch Status : Open / Closed Control Position : Local / Remote LBS Handle Locked & Gas Pressure Low External AC Power Loss, Enclosure Door Open Battery Overdischarged & Charging Circuit Error
System Error (Self Diagnosis Result) Control Cable Disconnected : optional Dimensions Pole-mounted LBS (Example : DB-GS-A) Control Box 6
Pole Mounting Accessories & Installation Installation Procedures for Assembly of Mounting Frames and Hanger Band on DB-GS-A 1 Loosen the bolts of Hanger Band A and Hanger Band B for mounting on the pole easily. 2 Make Bracket Assembly to assemble the Bracket and two Cross Bars with two Hex Bolts (M16x150L), two Hex Nuts (M16), two Spring Washers (M16) and two Plate Washers (M16). 3 And then, make Mounting Frame to assemble Bracket Assembly, Hanger Bands ( A and B ) with four Hex bolts (M16x50L), four Hex Nuts (M16), four Spring Washers (M16) and four Plate Washers (M16). 4 Assemble Mounting Frames on DB-GS-A with four Hook Bolts (M16), two Hook Plates, four Hex Nuts (M16) and four Spring Washers (M16). 5 Lift DB-GS-A to the pole with suitable lifting ropes and fix the Mounting Frame with Bolts, Stud Bolts, Nuts, Spring Washers and Plate Washers of Hanger Band A and Hanger Band B on the pole. When lifting DB-GS-A, use the carrying handle located on the top of the tank and follow the approved procedures. At this point, the contacts are open. Never use to lift bushing, bushing terminals, nor manual trip handle. The careless handling will bring a damage to DB-GS-A switch body.
Removal of Bushing Protection Covers If bushing protection covers are not removed, the protection covers will cause a line fault. These covers are attached to prevent the bushings from damage in transportation and installation. Pole Mounting of Control Box Mount the control box in a convenient, accessible location with two Hanger Bands, two Hex Bolts (M16), two Hex Nuts (M16) and two Spring Washers (M16), such as suitable bands or brackets. For pole-mounted installation, a hole and keyway in the controlmounting bracket accommodates a M16 bolt. Grounding DB-GS-A and Control Box To make grounding to the earth terminal of DB-GS-A and control box, 1 Grounding DB-GS-A Make ground connections to DB-GS-A ground connector located on the side of front leg of DB-GS-A. It will accommodate 22mm 2 to 60mm 2 steel ground connector with solderless clamp type. Make ground connections in accordance with approved utility standards. 2 Grounding Control Box Make ground control box using the ground connector provided at the upper of the enclosure for connecting 22mm 2 to 38mm 2 stranded grounding cable with solderless clamp type. Make ground connections in accordance with approved utility standards. Make sure control box is grounded and properly programmed for the planned installing Control Cable and Power Cable Connection Control cable is fabricated with receptacles on both ends. The length of our standard control cable is 7m (ordering option : shorter than 8m). It must be supported along its length to prevent repeated movement due to wind or other outside forces, which can damage the cable. Connect one side of the control cable receptacle (37 pins) to the receptacle of DB-GS-A and another side of the control cable receptacle to the receptacle extending from bottom of control box. Connect one side of the power cable receptacle (3 pins) to the receptacle on the bottom of control box and the opposite end to the power source (external PT). Check if all connections are positioned correctly and securely tightened before operation. Check DB-GS-A Operation After all installation, perform several operations manually and electrically to assure the motor mechanism. During this operation, please check the function of mechanical lever. 8