Vacuum Circuit-Breaker Modules

Transcription

1 Vacuum s Medium-Voltage Equipment Catalog HG.5 998

2

3 Vacuum s Medium-Voltage Equipment Description Catalog HG Siemens AG 998

4 NXACT Vacuum vacuum circuit-breaker module, kv Features DIN EN ISO 900 The vacuum circuit-breaker modules are subjected to a routine inspection exceeding the requirements laid down in the standards: Several hundred operating cycles per routine inspection Current measured value acquisition such as, for example, operating speed and contact travel during the run-in phase in comparison with the values of the 0/ Siemens HG.5 998

5 Description BASF Ludwigshafen Contents R-HG-eps Page Environmental compatibility DIN EN ISO 400 NX ACT vacuum circuitbreaker modules are environmentally compatible: In terms of selection of materials and manufacturing processes Environmentally neutral in operation and during switching processes Simple to dispose of at the end of their service life. Maintenance-free NX ACT vacuum circuitbreaker modules are maintenance-free: Under normal ambient conditions according to IEC and VDE 0670 Part 000 Up to 0,000 operating cycles: No relubrication No readjustment Nominal performance remains within tolerance even at very high operating frequencies or after long periods of idleness. R-HG-eps Applications, typical uses, features, designs / Switching duties, typical applications / Technical data /4 Construction and mode of operation /5 /8 Additional components /9 Secondary equipment /0 / Schematic diagrams / / Standards /4 Panel of an NXAIR withdrawable circuit-breaker module switchgear with NXACT vacuum circuitbreaker module Siemens HG /

6 NXACT Vacuum Description General Designs Applications Universal circuit-breaker module for all common medium-voltage switchgear As three-pole mediumvoltage circuit-breakers for all switching duties in indoor installations For switching all resistive, inductive and capacitive currents. R-HG-4eps Typical uses Overhead transmission lines Cables Transformers Capacitors Filter circuits * Motors Reactor coils Features Integrated, mechanical interlocks between operating mechanisms. Integrated, mechanical switch position indications for circuit-breaker, withdrawable part and earthing switch function (optional). Easy to withdraw, since only withdrawable part is moved. Fixed interlocking of circuitbreaker module with a switchpanel is possible. Manual or motor operating mechanism (optional for the operating mechanisms). Enforced connection of lowvoltage plug with the switchpanel, as soon as the module is installed in a panel. Maintenance-free operating mechanisms within scope of switching cycles. Vacuum circuit-breaker module, kv, 50 A R-HG-5eps Tulip-type contact, 50 A Vacuum circuit-breaker module, kv, 500 A Tulip-type contact, 500 A * Filter circuits cause an increase in voltage at the series-connected switching device. / Siemens HG.5 998

7 Description NXACT Vacuum Switching duties, typical applications Switching duties U = Synchronization and rapid load transfer (closing time 90 ms). K = Auto-reclosing The switching duty of the circuit-breaker module depends, for example, on its type of operating mechanism: Stored-energy operating mechanism For synchronization and rapid load transfer (U) For auto-reclosing (K) Snap-action operating mechanism (snap-action CLOSED, stored-energy OPEN) For normal closing and opening. Synchronization The closing times (for switching duties U and K) are so short that, at the instant the contacts touch, the systems being paralleled are still sufficiently in synchronism. Rapid load transfer (= transfer of loads from one source of supply to another without interruption of service) The vacuum circuit-breaker modules (switching duties U and K) have the very short closing and opening times which are required for this purpose. Tests conforming to the relevant standards have been carried out on the vacuum circuit-breaker modules for switching duty U. They included tests using the sequence O-t-CO-t -CO with full rated short-circuit breaking current. O = Opening C = Closing CO = Closing with subsequent opening in the circuitbreaker module s shortest close-open time. t, t' = Dead time of min. Auto-reclosing Used in overhead line systems to eliminate transient faults or short-circuits, such as those caused by thunderstorms, lightning or animals. The vacuum circuit-breaker modules (for switching duty K) have such short dead times between opening and closing, even at full short-circuit current, that the interruption in the supply has no appreciable effect on the load. If auto-reclosing is unsuccessful, the affected circuit is completely disconnected. According to the relevant standards, circuit-breaker modules designed for autoreclosing must be able to perform the test sequence O-t-CO-t -CO; in the case of unsuccessful auto-reclosing, only the sequence O-t-CO is required. t = 0. s, t = min. Multiple auto-reclosing The vacuum circuit-breaker modules are also suitable for multiple auto-reclosing, for example the following sequence O-t-CO-t -CO-t -CO-t -CO. t = 0. s, t = 5 s Interruption of short-circuit currents (With very high initial rates-ofrise of the transient recovery voltage) When interrupting short-circuit currents arising from faults immediately behind a transformer, generator or current limiting reactor, firstly it is possible for the full short-circuit current to develop and, secondly, the initial rate-of-rise of the transient recovery voltage may be considerably higher than the values specified in IEC and VDE Initial rates-of-rise up to 0 kv/µs may occur, or even higher values in the interruption of short-circuits on the load side of reactors. The circuit-breaker modules are also designed for these types of stresses. Switching of overhead lines and cables When unloaded overhead lines and cables are being disconnected, the relatively low capacitive currents are interrupted without restrike and, therefore, without overvoltage. Switching of transformers Due to the special type of contact material used, the chopping current of circuitbreaker modules is only 4 to 5 A, which means that no dangerous overvoltages arise when unloaded transformers are disconnected. Switching of capacitors Vacuum circuit-breaker modules are primarily designed for switching operations in capacitive circuits. They are able to disconnect capacitor banks of the highest ratings without restrike and, therefore, without overvoltages. The interruption of capacitive currents has been tested up to 600 A and up to rated voltages of kv. This value depends on the test facility used. Operating experience has shown that as a guiding value in general capacitive currents up to 70 % of the rated breaker normal current can be controlled. When capacitors are connected in parallel, currents which have the same level as short-circuit currents can occur which, due to their high rate-ofrise, may cause damage to the system components. Making currents up to a peak value of 0 ka are permissible; higher values on request. Switching of filter circuits When interrupting filter circuits or disconnecting reactorconnected capacitor banks, loading of the circuit-breaker modules by recovery voltage is greater than with pure capacitors. The reason for this is that the reactor and the capacitor are connected in series. This has to be taken into account when selecting the circuit-breaker module with respect to its rated voltage. Switching of motors If small high-voltage motors are disconnected during start-up, switching overvoltages may occur. This affects high-voltage motors with a starting current of up to 600 A. The level of these overvoltages can be reduced to safe values by means of special surge limiters (see Catalog HG Overvoltage Protection ). Overvoltage protection is not required for motors with individual p.f. correction. Siemens HG /

8 NXACT Vacuum Description Technical data Electrical data, product range Rated voltage U r Rated lightning impulse voltage U p kv 75 kv 000 A A HG-4a eps Rated short-time power-frequency voltage U d 8 kv 000 Rated short-circuit 50 ka 6 ka making current I ma Rated short-circuit 0 ka ) 5 ka ) breaking current I sc up to 50x 5x 50x 50x A C 60 Operating times Vacuum circuit- Equipped with breaker module Closing time < 75 ms ) Opening time < 65 ms ) st shunt release < 50 ms ) nd shunt release Arcing time < 5 ms Break time < 80 ms st shunt release < 65 ms nd shunt release Dead time 00 ms CLOSE/OPEN time < 75 ms st shunt release < 60 ms nd shunt release Minimum command duration 45 ms Closing solenoid 40 ms st shunt release 0 ms nd shunt release Pulse time to breaker tripping signal > 5 ms st shunt release > 0 ms nd shunt release Spring-charging time for electrical operation < 0 s Synchronous operation error between the poles ms ) Shorter operating times on request. The values of rated normal current listed above were defined in accordance with the requirements of VDE 0670 Part 000 or IEC at an ambient temperature of 40 C and apply for NXAIR withdrawable circuit-breaker module switchgear. In the case of enclosed-type switchgear, the information of the switchgear manufacturer shall be applicable. In the event of ambient temperatures <40 C, higher rated normal currents may be carried (see diagram above). NXACT vacuum circuit-breaker modules have been designed to conform to the normal operating conditions laid down in the relevant standards VDE 0670 Part 000 and IEC Ambient temperature Maximum: + 40 C Maximum 4-hour mean: + 5 C Minimum: 5 C Relative air humidity (measured average values): Over 4 hours: max. 95 % Over month: max. 90 % /4 Siemens HG.5 998

9 NXACT Vacuum Construction and mode of operation Arc-quenching system As the contacts open, the current that is to be interrupted initiates a metal-vapor arc discharge. Current continues flowing through the metalvapor plasma until the next current zero. The arc extinguishes at approximately current zero. The metal vapor loses its conductivity within a few microseconds, which very quickly re-establishes the dielectric strength of the contact gap. A certain minimum current is needed in order to maintain the metal-vapor arc discharge. The arc will be chopped before the natural current zero if the current falls below this value. In order to prevent impermissible overvoltages when performing switching operations in inductive circuits, the chopping current must be limited to the lowest possible value. Due to the use of a special contact material, the chopping current is only 4 to 5 A. Due to the rapid recovery of the dielectric strength of the contact gap, the arc is safely quenched even in cases where contact separation occurs immediately before a current zero. Consequently, the arcing time of the last poles to clear is no more than 5 ms. With radial magnetic field contacts, the arc burns diffusely while the current is up to approx. 0 ka (instantaneous value). At higher current values the arc is contracted, so that local overheating of the contact pieces must be avoided. HG-6 eps An additional radial magnetic field produces a force which causes the arc to run around the arcing rings of the contact pieces. This allows the contact erosion that occurs at the root of the arc to be distributed over the whole circumference of the rings. Siemens HG /5

10 NXACT Vacuum Description Construction and mode of operation Assemblies Operating mechanism unit for accommodating: Control board with operating, indication and interlocking elements Operating mechanism for circuit-breaker, withdrawable part and earthing switches (optional) Withdrawable part (pole column) consisting of: Vacuum interrupters Isolating contacts Pole shells Operating mechanism crosspiece Carrier element for operating mechanism unit and withdrawable part Guides for moving the pole column to the connected/ disconnected position Accommodates the pole linkage and operating mechanism shafts. Legend Upper connection for isolating contacts Vacuum interrupter Lower connection for isolating contacts 4 Pole shell 5 Guide rods for moving pole column 6 Pole linkage 7 Travel of pole column from disconnected to connected position 8 Travel of pole column from connected to disconnected position 9 Operating mechanism unit 0 Closing spring Circuit-breaker operating mechanism linkage Control board Lockable operating mechanism shaft for withdrawable part 4 Lockable operating mechanism shaft for feeder and busbar earthing switches Withdrawable part (pole column) Circuit-breaker module (section), 50 A 7 8 Operating mechanism cross-piece Operating mechanism unit HG-5a eps Control board Operating safety by virtue of Clear arrangement of operating and indicating elements Orientation of switch position indication with reference to mimic diagram Optional: Plant-related modifiable mimic diagram Mutual mechanical and electrical interlocks for Breaker operating mechanism Operating mechanism of withdrawable part Operating mechanisms for feeder and busbar earthing switches (optional) Additional locking of all operating mechanism functions by means of padlocks Control board can be integrated in switchgear front. Legend Disconnector function Switch position indication Manual operation with locking valve Earthing switch function for feeder (optional) Switch position indication 4 Manual operation ON/OFF Circuit-breaker 5 Hand crank coupling for energy storage spring 6 Closing spring charged indicator 7 Operating cycle counter 8 Pushbutton CLOSED 9 Pushbutton OPEN 0 Switch position indication Earthing switch function for busbar (optional) Switch position indication Manual operation ON/OFF R-HG-5eps 4 Control board with mimic diagram /6 Siemens HG.5 998

11 Description NXACT Vacuum Construction and mode of operation Interlocks Mechanical interlocks according to VDE 0670 Part 6 and IEC Circuit-breaker withdrawable part: Circuit-breaker can be closed only in connected and disconnected positions Circuit-breaker can be closed only in connected position if auxiliary voltage is available Withdrawable part can be moved into open or closed position only when circuit-breaker is open Withdrawable part can be operated only when circuit-breaker is open Withdrawable part earthing switch: Earthing switch can be closed only with withdrawable part in disconnected position Circuit-breaker module: Circuit-breaker module can be moved out of panel only with withdrawable part in disconnected position Shock-hazard protection: Shutters for shock-hazard protection are operated by the withdrawable part of the circuit-breaker module. HG-7 eps 4 4 Electrical interlocks Required with the auxiliary circuit plug connector withdrawn as a Plug connector withdrawn signal With manual operating mechanism and interlocks acting across several panels (e.g. solenoid interlocking of busbar earthing switches against feeder breakers) With motor operating mechanism with interlocks acting within a panel and across several panels All electrical interlocks between assemblies of circuit-breaker module and their positions attainable Additionally to mechanical interlocks between circuit-breaker, withdrawable part and earthing switch Conventionally via contactors and connections at auxiliary switch contacts of switching devices. Electromagnetic interlocks As higher-level interlock Disconnecting and earthing possible only when enabled by a higher-level control Options Interlocking by means of built-in cylinder locks for the operating mechanisms of withdrawable part and earthing switch Interlocking by means of padlocks for operating mechanisms of circuit-breaker, withdrawable part and earthing switch. Siemens HG /7

12 NXACT Vacuum Description Construction and mode of operation Stored-energy mechanism Features Stored-energy mechanism via closing and opening spring Charging of springs manually or electrically Storage of switching sequence Trip-free mechanism Features To VDE 0670 To IEC The operating mechanism is generally of the stored-energy type. The mechanism operates the pole assemblies through rods. The closing spring can be charged either electrically or manually. It latches in when charging is complete. The closing spring acts as the stored-energy mechanism. For closing, the closing spring can be unlatched either mechanically by means of the local CLOSE pushbutton or electrically by remote control. The closing spring charges the contact-pressure/opening springs as the breaker closes. The now discharged closing spring will be charged again automatically by the mechanism motor if this exists. The breaker is now capable of performing the OPEN CLOSE OPEN switching sequence that is required for an unsuccessful auto-reclosing operation. All stored-energy mechanisms perform the switching duties of synchronizing and rapid load transfer (U) as well as autoreclosing (K). In the event of an opening command being given after a closing operation has been initiated, the moving contacts return to the open position and remain there even if the closing command is sustained. This means that the contacts of the circuit-breaker module reach the closed position under these circumstances, as is permitted by IEC and VDE Operating mechanism unit with stored-energy mechanism and secondary equipment Operating mechanism for disconnector function Motor and gearbox Closing spring 4 Closing solenoid 5 Auxiliary switch for disconnector function 6 Operating mechanism for feeder earthing switch R-HG-6eps 7 Low-voltage plug connector 8 Auxiliary switches for switching function 9 Opening block 0 st shunt release Operating mechanism motors Features DC or AC motors Short-time duty Varistor circuitry The motors operate in shorttime duty. Therefore, the voltage and power consumption need not agree with the data on the rating plate. Protection of operating mechanism motors (see adjacent table) The inrush current in the operating mechanism motor can be neglected due to its very short duration. Power consumption and rated normal currents for motor short-circuit protection Rated voltage Voltage Power Smallest possible of operating range consumption rated normal current mechanism of the of the m.c.b. with motor G-characteristic max. min. V V V W VA A DC AC /8 Siemens HG.5 998

13 Description NXACT Vacuum Additional components (in preparation) The NXACT vacuum circuit-breaker module can be completed with additional components to form a switching device: Switching device with tulip-type contacts Switching device with flat contacts Features Modular integration in medium-voltage installations Variable circuit-breaker module solutions from economy type to complete installations For switchgear width of 800 mm: Rated normal current up to 500 A Rated short-circuit breaking current up to 5 ka. Switching device with tuliptype contacts Consisting of NXACT vacuum circuitbreaker module with tuliptype contacts (radiallyarranged, spring-loaded contact pieces) Withdrawable rails for circuitbreaker module Shutters as shock-hazard protection 4 Bushing-type transformer or post insulator with mating contacts as complete unit integral with shutters and the withdrawable rails 5 Option: Truck for withdrawing circuit-breaker module from panel. HG-57a eps 4 Designs On request. 5 Switching device with flat contacts Consisting of NXACT vacuum circuitbreaker module with flat contacts Withdrawable rails for circuitbreaker module Bushings with mating contacts in partition of panel 4 Mounting angle brackets as mating contacts (copper). Option: Truck for withdrawing circuitbreaker module from panel (see Fig. above, detail 5) HG-58a eps 4 Siemens HG /9

14 NXACT Vacuum Description Secondary equipment The extent of the secondary equipment of the circuitbreaker module depends on the particular application and offers a great variety of possibilities to satisfy nearly every requirement. All secondary modules are described below and combination possibilities are stated in Part of this catalog. Releases A release is a device which transfers commands from an external source, such as a control room, to the latching mechanism of the circuitbreaker module so that it can be opened or closed. The various types of releases available are described in detail below. The VDE designations for the devices are also given (in parentheses) when they differ from the terms used in this catalog. AY5 0 closing solenoid (shunt-closing release) The closing solenoid unlatches the charged closing spring and thus closes the circuit-breaker module electrically. It is available for either DC or AC operation. Shunt release (shunt-opening release) Shunt releases are used for automatic tripping of the circuit-breaker module by suitable protective relays and for deliberate tripping by electrical means. They are intended for connection to an external power supply (DC or AC) but, in special cases, may also be connected to a voltage transformer for manual operation. Two different types of shunt release are available: The st shunt release AY5 0 is normally included in the basic equipment of the circuit-breaker module. With this design, the electric tripping pulse is fed to the OPEN latching mechanism by means of a direct-acting solenoid armature in order to open the circuit-breaker module. The AX 0 release is fitted if more than one shunt release is required (nd shunt release possible). With this design, the electrical operning command is boosted by means of a solenoid armature unlatching a stored-energy mechanism before being fed to the OPEN latching mechanism in order to open the circuitbreaker module. Shorter opening times are possible with this release than with the AY5 0 type. For the maximum possible number of releases that may be fitted, see selection and ordering data in Part of this catalog. AX 0 undervoltage release An undervoltage release comprises a stored-energy mechanism, an unlatching mechanism and an electromagnetic system which is permanently energized while the circuit-breaker module is closed. If the voltage falls below a predetermined value, unlatching of the release is enabled and the circuit-breaker module is opened via the stored-energy mechanism. Manual tripping of the undervoltage release is generally performed with an NC contact in the tripping circuit, but may also be performed with an NO contact by short-circuiting the solenoid coil. With this type of release, the short-circuit current is limited by the built-in resistors. Undervoltage releases can also be connected to voltage transformers. The circuitbreaker module is then tripped automatically if the operating voltage drops to impermissibly low levels. Unsuccessful attempts at closing when the solenoid coil of the undervoltage release is not energized can be prevented in the following ways: By normally fitting electrical local closing in conjunction with the undervoltage release By connecting the undervoltage release, operated through an NO contact and closing solenoid, to the same operating voltage. Undervoltage release with delay For delayed tripping, the undervoltage release can be combined with type AN 90 stored-energy mechanisms (for AC) and type AN 90 (for DC), both types manufactured by Bender *. Adjustable delay times: s,.8 s and.5 s. For combination with the stored-energy mechanisms, matched undervoltage releases must be fitted. The storedenergy mechanisms are not included in the scope of supply but must be ordered separately from Bender *. Current transformer-operated release Consisting of: Stored-energy mechanism Unlatching mechanism Electromagnetic system. Current transformer-operated releases are used where no external auxiliary voltage (battery) is available. Tripping is effected by means of a protective relay (e.g. overcurrent-time protection) acting on the current transformeroperated release. * Ordering address Dipl.-Ing. W. Bender GmbH & Co. KG P.O. Box 6 D-50 Grünberg Germany Two different current transformer-operated releases are used: AX 0 current transformer-operated release with a rated current of 0.5 A which requires auxiliary transformers (e.g. type 4AM5 see catalog sheet LSA..6 Auxiliary current transformers for differential relays for overhead lines, cables and transformers ) in addition to the main current transformers. The stored-energy mechanism is unlatched when the tripping current is exceeded (90 % of the rated current of the current transformeroperated release), thus causing the circuit-breaker module to be opened. AX 04 current transformer-operated release, lowenergy version for a tripping pulse of min. 0. Ws. It is always used in conjunction with the 7SJ4 protective system (independent overcurrent-time protection with three-phase current transformer) or with similar protective systems. The protective system takes its supply and release energy for the circuit-breaker module from its own current transformer and is thus not dependent on external auxiliary voltages. The transformer current ensures that the protective relay is supplied with energy and fills an energy store, the charge of which is available as a tripping pulse at the time of tripping. This tripping pulse with 0. Ws is switched by the command contact and is capable of activating the current transformer-operated release. Anti-pumping (mechanical and electrical) If constant CLOSE and OPEN commands are present at the circuit-breaker module at the same time, the circuit-breaker module will return to the open position after closing. It remains in this position until a new CLOSE command is given. In this manner, continual closing and opening (= pumping ) is prevented. /0 Siemens HG.5 998

15 Description NXACT Vacuum Secondary equipment Power consumption and operating ranges of releases Releases Order No. Power consumption Operating ranges Trippof ing Operation Operation with Release voltage Release voltage releases pulse with DC, AC 50/60 Hz, with DC or current consumption consumption with AC 50/60 Hz approx. W approx. VA Ws Closing solenoid AY to 0 % U 85 to 0 % U st shunt release (without AY to 0 % U 85 to 0 % U stored-energy mechanism) nd shunt release (with AX to 0 % U 85 to 0 % U stored-energy mechanism) Undervoltage AY to 0 % U 5 to 0 % U release Current transformer- AX 0 0 * 90 to 0 % I a operated release (rated current 0.5 A) Current transformer- AX operated release (low-energy version) Breaker tripping signal The NO contact S6 makes brief contact while the circuitbreaker module is opening and this is often used to operate a hazard-warning system which, however, is only allowed to respond to automatic tripping of the circuit-breaker module. Therefore, the signal from the NO contact must be interrupted when the breaker is being opened intentionally. This is accomplished under local control with the S7 cutout switch that is connected in series with the NO contact (see circuit example on page /). Position switch for signalling closing spring charged The charging status of the closing spring of the circuitbreaker module can be interrogated electrically by means of the position switch. Varistor module When inductive loads are being disconnected in DC circuits, it is possible for switching overvoltages to be produced which may pose a risk to solid-state devices. This risk can be eliminated by connecting varistors across the inductances of the circuit-breaker module (motor, closing solenoid, releases). A suitable varistor module for operating voltages 60 V DC to 50 V DC is fitted when ordered. It limits the overvoltage to approx. 500 V. Electrical local closing In the standard version, the circuit-breaker modules can be remote-closed electrically. In addition, they can be mechanically closed locally by direct unlatching of the closing spring. In this version, the closing circuit of the circuit-breaker module is triggered electrically by means of a pushbutton. This arrangement allows interlocking conditions arising from the system to be accepted in the local mode so that the circuit-breaker cannot close accidentally. For example, the circuit-breaker module can be interlocked through the auxiliary contact of a disconnector (see section on interlocking and also schematic diagrams on page /). Circuit-breaker modules fitted with electrical local closing cannot be closed mechanically. Interlocking Mechanical interlocking The sensing devices on the system side check the status of the circuit-breaker module and prevent it from closing if the associated disconnector is not in a position to allow safe operation. The system also prevents the disconnector from being operated while the circuit-breaker module is closed. Similarly, the mechanical interlocking system can also be used for interlocking breaker trucks or withdrawable circuitbreakers. Electrical interlocking Circuit-breaker modules can be incorporated in electromagnetic interlocking schemes for feeders and substations. With electrical interlocking, a magnetic lockout is fitted to the disconnector or its operating mechanism. The lockout is operated through an auxiliary contact of the circuit-breaker module so that the disconnector can only be operated when the circuit-breaker module is open. The circuit-breaker module, on the other hand, is controlled by the disconnector or its operating mechanism so that it may only be closed when the disconnector is in its end positions. For this purpose, the operating mechanism must be fitted with the electrical local closing system (see section on electrical local closing). Operating cycle counter An operating cycle counter is integrated in the control board to indicate the number of operating cycles performed by the circuit-breaker module. The number of operating cycles can be used to derive the operating life or servicing cycles. Secondary connections (for control circuit) 64-pole plug connector (e.g. type Han 64 D of Harting make) with crimping connections (a Harting crimping tool is necessary to connect the wiring). For availability of secondary connectors see under Secondary equipment in Part of this catalog. The upper plug part and sleeve of the connector are supplied loose. No tools are required for plugging and unplugging the upper and lower plug parts. The schematic diagrams show the factory assignment of the secondary connections. All circuit-breaker modules have the same assignment of terminals if they have the same secondary connections, with the result that it is easy to replace any breaker modules. Other terminal assignments on request. SV9 auxiliary switches The following versions are available (NO = normally-open contact, NC = normally-closed contact): 6 NO + 6 NC NO + NC For availability and possible use by customers see under Secondary equipment in Part of this catalog. Rated insulation voltage Insulation Continuous current Making current Breaking capacity at 0 V DC 50 V AC/DC Class C to VDE 00 0 A 50 A A * Consumption with operating current (90 % of the rated current) and open-circuit armature. Siemens HG /

16 NXACT Vacuum Description Schematic diagrams (not binding examples only) Q0 circuit-breakers K Contactor (anti-pumping) M Motor operating mechanism R Resistor S Auxiliary switch S, Position switches for S switching off motor operating mechanism after charging of closing spring S Position switch (opens as soon as closing spring charged) S4 Position switch (for signalling charged status of closing spring) S6 Breaker tripping signal S7 Cut-out switch for breaker tripping signal V, Varistor V, modules V X0 Plug connector Y st shunt release Y nd shunt release Y7 Undervoltage release Y9 Closing solenoid HG-47a eps Secondary equipment for circuit-breaker (standard version) -Q0 -S A -M A AC M DC Option: Releases DC D -S Motor operating mechanism C 4 -S A4 Closing and anti-pumping Shunt release Closing spring charged signal Breaker tripping signal -V B -V 4 -S -K A A 4 -K -Y9 -S -K A A D 4 -S B -V -Y7 D D 4 D MANUAL OFF -Y MANUAL ON A A 4 B A -V C 4 B4 -S4 -S7 C4 -S6 4 D4 A5 -Y D D HG-48 eps -R D Undervoltage release for circuit-breaker HG-49 eps A nd shunt release for circuit-breaker Rectifier (only with AC) Earthing switch OFF Withdrawable part OFF 4 Interlocking of withdrawable part end position/circuit-breaker 5 Interlocking of withdrawable part solenoid/circuit-breaker 6 Interlocking shutter for manual operation closed / Siemens HG.5 998

17 Description NXACT Vacuum Schematic diagrams (not binding examples only) 4 4 -S C5 D5 A6 C6 Option: Manual actuation A7 C B6 D6 B7 D7 A8 7 B Auxiliary switches -Q0 -S8 HG-5a eps 9 9 -S -Y 4 D D D5 For withdrawable part A6 C8 D8 B9 D9 5 A9 C HG-5 eps -Q8 -S -Y8 7 7 D D B A HG-50 eps Secondary equipment for withdrawable unit (standard version) -Q -V For feeder earthing switch -S B6 C S8 4 D C4 A5 4 4 C A4 B4 D4 B5 HG-5 eps C5 D S -S -Q5 -Y5 A0 B D D -S D C 6 -V 4 For busbar earthing switch C Auxiliary switches D0 6 -S C B A Q withdrawable unit M Motor operating mechanisms for withdrawable part, feeder and busbar earthing switches Q0 Circuit-breaker Q8 Feeder earthing switch (manual operating mechanism) Q5 Busbar earthing switch S Auxiliary switch S Position switch for check-back signal S5 Position switch for check-back signal S8 Position switch for check-back signal S8 Position switch for Earthing switch OFF V Varistor module X0 Plug connector Y Closing solenoid for withdrawable part Y8 Closing solenoid for feeder earthing switch Y5 Closing solenoid for busbar earthing switch D5 A C A -Q8 -S8 4 6 Option: Motor actuation -M A M DC D -V -M A M DC D -V -M A M DC D -V -Q -S -Q5 4 6 HG-54a eps A6 For withdrawable part HG-55a eps B For feeder earthing switch HG-56a eps For busbar earthing switch D HG-6 eps -S5 4 Check-back signal * B 6 * Check-back signal of Mechanical operation and interlocking for withdrawable part, feeder earthing switch and busbar earthing switch Siemens HG /

18 NXACT Vacuum Standards The NXACT vacuum circuitbreaker modules conform to the following standards: IEC IEC BS 5 VDE 0670 with reference to: IEC 6007 IEC 607 IEC 6098 Insulating capacity The NXACT vacuum circuitbreaker modules are suitable for site altitudes up to 000 m. They can be used in buildings with poor heat insulation or low heating capacity, heated or cooled, without temperature monitoring. The heating or cooling system can fail for several days. The specified values are referred to sea level. When installed at altitudes above 000 m, an allowance must be made for the resulting decrease in insulating capacity (see correction factor a in the diagram below). Ambient conditions The NXACT vacuum circuitbreaker module meets the following ambient conditions according to IEC 607--, 990: Climatic: Class K4 (minimum temperature limit -5 C) Class K6 (without ice formation and wind-driven precipitation) Class Z Class Z5 Biological: Class B Chemically active materials: Class C (without occurrence of saline fog with simultaneous condensation) Mechanically active materials: Class S (restriction according to operating instructions: clean insulating components) Mechanical: Class SM. The following expression thus applies for the selection of the devices and equipment: /4 Siemens HG.5 998

19 Bereich Energieübertragung und -verteilung Geschäftsgebiet Mittelspannung Postfach 0 D-9050 Erlangen Siemens Aktiengesellschaft Order No.: E5000-K5-A5-A-7600