CN203301163U - Composite switch of 10-kV no-impact switched multi-group capacitor group - Google Patents

Abstract

The composite switch of 10kV non-impact switching multi-group capacitor banks involves the field of 10kV reactive power compensation, especially the classification of multi-group switching capacitor banks by 10kV composite switches; it is to solve the problem of existing 10kV switching reactive power compensation capacitor banks. The composite switch cannot realize the problem of multi-group switching of a valve group and the problem that the valve group cannot work in a single group. It includes a photoelectric transceiver module, a controller, a high-voltage thyristor valve group, a high-frequency pulse power supply, a pulse energy-taking coil, and a SCR drive box, valve group failure and zero-crossing detection main board, three-phase vacuum circuit breaker and N units; the unit includes 2 photoelectric transceiver modules, 2 three-phase vacuum contactors, 1 three-phase reactor and 1 three-phase capacitor; the zero-crossing switching of three-phase capacitors with reactors in series is realized through the high-voltage thyristor valve group. There is no impact and no inrush during the switching process, which greatly improves the life of three-phase capacitors and mechanical switches and reduces The impact of switching three-phase capacitors on the 10kV system is mainly used in the 10kV system.

Description

10kV Composite Switch for Non-Impact Switching of Multiple Capacitor Banks

technical field

The utility model relates to the field of 10kV reactive power compensation, in particular to a 10kV composite switch graded multi-set switching capacitor bank. the

Background technique

With the increase of power system load, the demand for reactive power is also increasing. Obviously, it is unreasonable and usually impossible for these large amounts of reactive power to be provided by the engine and transmitted over a long distance. Since the transmission of reactive power in the grid will cause network loss and voltage drop at the receiving end, the transmission of a large amount of reactive power in the grid will inevitably reduce the utilization rate of electric energy and seriously affect the quality of power supply. Installing reactive power compensation devices at appropriate locations in the power grid has become a necessary means to meet the reactive power requirements of the power grid. Reactive power compensation is of great significance to improve the power factor, ensure the full utilization of the active power of the grid, reduce line loss, improve the power supply efficiency and voltage quality of the power system, and reduce the cost of power distribution circuits. In recent years, the importance of reactive power compensation to power systems has been widely recognized by people. At present, the switching of compensation capacitors in substations adopts ordinary switches, which cannot realize intelligent zero-crossing switching. Therefore, switching capacitors generates large transient impulse voltage and current to the system, to the capacitor body, and to the switching switch. It will cause great harm to the safe operation of power grid equipment, compensation capacitors and switching switches. Theoretical research, actual test and operation experience show that frequent non-zero switching of capacitors will lead to the reduction of switch life, overcurrent explosion of capacitors, and interference to some sensitive electrical equipment in the power grid. the

With the increase of nonlinear loads such as frequency converters, rectifiers, and electric arc furnaces in the system, the harmonic pollution of the power system is becoming more and more serious, and the operation of reactive power compensation equipment realized by capacitors alone in the system becomes more and more dangerous. , the harmonics will cause the resonant overvoltage or overcurrent of the compensation capacitor bank, resulting in the burning of the capacitor or the overvoltage fault of other electrical equipment in the system. Wave reactor, and the series connection of the suppression harmonic reactor greatly reduces the life of the high-voltage switching switch. When the compensation branch is cut off, it will cause arc burnout, so the high-voltage thyristor valve group switching series has a suppression harmonic reactor The capacitor composition is the most reliable switching switch at present, but the current price of the high-voltage thyristor valve group is relatively expensive, and the cost of switching in multiple groups is very high, so the high-voltage composite switch has become the best choice. the

In the low-voltage system, the composite switch has been widely used. The structure of the composite switch is to connect a small-capacity bidirectional thyristor in parallel at both ends of the contactor. The action process of the composite switch is:

When inputting, the bidirectional thyristor first conducts at zero crossing, and then the contactor pulls in, and completes the input process without impact;

When cutting off, give the drive box of the bidirectional thyristor a driving signal to make the bidirectional thyristor conduct, and then give the contactor a disconnection signal. After the contactor is disconnected, cut off the driving signal of the thyristor, and there is no completion of arc pulling Excision process. the

Utility model content

The utility model is to solve the problem that the compound switch of the existing 10kV switching reactive power compensation capacitor group cannot realize the multi-group switching of a valve group and the valve group cannot work in a single group, thus proposing a 10kV non-impact switching multi-group Composite switch for capacitor banks. the

10kV non-impact switching composite switch for multi-capacitor banks, which includes the first photoelectric transceiver module, controller, high-voltage thyristor valve group, high-frequency pulse power supply, pulse energy-taking coil, thyristor drive box, valve group failure and zero-crossing detection main board, three-phase vacuum circuit breaker and N units;

Each unit includes a second photoelectric transceiver module, a third photoelectric transceiver module, two three-phase vacuum contactors, one three-phase reactor and one three-phase capacitor;

The first control signal output end of the controller is connected to the control signal input end of the first photoelectric transceiver module, the first state signal input end of the controller is connected to the state signal output end of the first photoelectric transceiver module, and the The control signal output terminal of the first photoelectric transceiver module is connected to the control terminal of the three-phase vacuum circuit breaker;

The second control signal output end of the controller is connected with the control signal input end of the second photoelectric transceiver module, the second state signal input end of the controller is connected with the state signal output end of the second photoelectric transceiver module,

The control signal output end of the second photoelectric transceiver module is connected to the control end of the first three-phase vacuum contactor;

The third control signal output end of the controller is connected to the control signal input end of the third photoelectric transceiver module, the third state signal input end of the controller is connected to the state signal output end of the third photoelectric transceiver module, and the The control signal output terminal of the third photoelectric transceiver module is connected to the control terminal of the second three-phase vacuum contactor;

The trigger signal output end of the controller is connected to the trigger signal input end of the high-frequency pulse power supply, the fault signal input end of the controller is connected to the fault signal output end of the high-frequency pulse power supply, and the high-frequency pulse power supply The power signal output end is connected to the power signal input end of the valve group failure and zero-crossing detection main board, and the failure signal output end of the valve group failure and zero-crossing detection main board is connected to the valve group failure signal input end of the controller. The zero-crossing signal output end of the valve group fault and zero-crossing detection main board is connected with the zero-crossing signal input end of the controller, and the control signal output end of the high-voltage thyristor valve group is connected with the valve group fault and zero-crossing detection main board The control signal input terminal is connected, the high-frequency pulse power supply passes through the pulse energy-taking coil through a high-voltage silicone wire, one end of the pulse energy-taking coil is connected to the signal input terminal of the thyristor drive box, and the controllable The drive signal output terminal of the silicon drive box is connected to the drive signal input terminal of the high-voltage thyristor valve group,

The three-phase input end of the high-voltage thyristor valve group is connected to one end of the three-phase vacuum circuit breaker and one end of the first three-phase vacuum contactor at the same time, and the control end of the three-phase vacuum circuit breaker is connected to the first photoelectric The control signal output terminal of the transceiver module is connected,

The three-phase output end of the high-voltage thyristor valve group is connected to one end of the second three-phase vacuum contactor, and the other end of the first three-phase vacuum contactor is simultaneously connected to the other end of the second three-phase vacuum contactor. One end is connected to one end of a three-phase reactor, and the other end of the three-phase reactor is connected to a three-phase capacitor. the

Said N is a positive integer greater than or equal to 2. the

The high-pressure thyristor valve group is a two-phase high-pressure thyristor valve group, and the two-phase high-pressure thyristor valve group includes phase A and phase C. the

Through the setting of the internal parameters of the controller, the composite switch of the 10kV non-impact switching multi-group capacitor bank described in the utility model can work in three kinds of operations: "composite switch state", "mechanical switch state" and "comprehensive switch state". model. the

(1) Composite switch state

When everything is normal and the reactive power fluctuation of the system is not very fast, it generally works in this state. the

Taking a group of three-phase capacitors as an example, the process of switching on and removing the three-phase capacitors is introduced:

Three-phase capacitor input process: the controller first sends a control signal to the three-phase vacuum circuit breaker. After the three-phase vacuum circuit breaker is closed, the controller judges the closing signal of the three-phase vacuum circuit breaker. If the controller does not receive the first If the closing signal of the photoelectric transceiver module is received, the controller will send the three-phase vacuum circuit breaker refusal fault signal; if the controller receives the closing signal of the first photoelectric transceiver module, the controller will close the second three-phase vacuum contactor signal, if the controller does not receive the closing signal of the second three-phase vacuum contactor, the controller sends the second three-phase vacuum contactor rejection fault signal; if the controller receives the closing signal of the second three-phase vacuum contactor Gate signal, the controller detects valve group failure and zero-crossing detection The zero-crossing signal and valve group failure signal of the high-voltage thyristor valve group sent by the main board, if no zero-crossing signal is detected, the controller reports a synchronization signal failure; if detected When the fault signal of the valve group is detected, the controller reports the fault of the valve group; if the controller detects the fault of the valve group and the zero-crossing signal of the zero-crossing detection main board, the controller sends a trigger signal to the high-frequency pulse power supply and detects whether the high-frequency pulse power supply is faulty signal, if the high-frequency pulse power supply has a fault signal, the controller will report the high-frequency pulse power supply fault signal, if the high-frequency pulse power supply has no fault signal, the high-frequency pulse power supply will supply energy to the pulse energy coil through the high-voltage silicone wire, and the pulse energy The coil drives the high-voltage thyristor valve group to conduct through the thyristor trigger box; the three-phase capacitor is put into the 10kV system, and the controller sends the closing signal to the first three-phase vacuum contactor. If the controller does not receive the second photoelectric transceiver If the closing signal sent by the module, the controller sends the first three-phase vacuum contactor failure signal, if the controller receives the closing signal sent by the second photoelectric transceiver module, the controller stops sending the high-frequency pulse power supply trigger signal , the high-voltage thyristor valve group is turned off and turned on, and the controller sends an opening signal to the second three-phase vacuum contactor. If the controller does not receive the opening signal from the third photoelectric transceiver module, the controller sends the second three-phase The vacuum contactor rejects the fault signal, which completes the input process of a group of three-phase capacitors. the

Three-phase capacitor removal process: the controller detects the opening and closing state signal of the first three-phase vacuum contactor through the second photoelectric transceiver module,

When the controller detects that the first three-phase vacuum contactor is in the closing state, the controller sends a closing signal to the second three-phase vacuum contactor,

The controller detects the valve group failure and the zero-crossing signal and the valve group failure signal sent by the zero-crossing detection main board. When the controller detects the valve group failure and the valve group failure signal of the zero-crossing detection board, the controller reports the valve group failure;

When the controller detects the failure of the valve group and the zero-crossing signal of the zero-crossing detection main board, the controller sends a trigger signal to the high-frequency pulse power supply and detects whether the high-frequency pulse power supply has a fault signal. If the controller detects that the high-frequency pulse power supply has If there is a fault signal, the controller will report a power failure signal. If the controller detects that the high-frequency pulse power supply has no fault signal, the high-frequency pulse power supply supplies energy to the pulse energy-taking coil through the high-voltage silicone wire, and the pulse energy-taking coil drives the high-voltage thyristor valve group to conduct through the thyristor trigger box; The controller sends an opening signal to the first three-phase vacuum contactor. If the controller does not receive the opening signal from the second photoelectric transceiver module, the controller sends the first three-phase vacuum contactor a failure signal. When the device receives the opening signal from the second photoelectric transceiver module, the controller stops sending the high-frequency pulse power supply trigger signal, the high-voltage thyristor valve group is turned off, and the controller gives the second three-phase vacuum contactor an opening signal. If the controller does not receive the opening signal sent by the third photoelectric transceiver module, the controller sends the second three-phase vacuum contactor rejection fault signal. In summary, the removal process of a group of three-phase capacitors is completed. the

(2) Mechanical switch status

Taking a group of three-phase capacitors as an example, the process of switching on and removing the three-phase capacitors is introduced:

When the controller detects a valve group failure signal, synchronization failure or power failure, the controller controls the three-phase vacuum circuit breaker to close. After the three-phase vacuum circuit breaker is closed, the controller judges the closing signal of the three-phase vacuum circuit breaker. If If the controller does not receive the closing signal from the first photoelectric transceiver module, the controller sends a three-phase vacuum circuit breaker refusal fault signal;

If the controller receives the closing signal sent by the first photoelectric transceiver module,

When put into operation, the controller sends the closing signal to the first three-phase vacuum contactor. If the controller does not receive the closing signal from the second photoelectric transceiver module, the controller sends the second three-phase vacuum contactor a refusal fault signal. If the controller receives the closing signal sent by the second photoelectric transceiver module, the input process is completed;

When cutting off, the controller sends an opening signal to the first three-phase vacuum contactor. If the controller does not receive the opening signal from the second photoelectric transceiver module, the controller sends a failure signal to the second three-phase vacuum contactor. If When the controller receives the opening signal sent by the second photoelectric transceiver module, the cutting process is completed. the

Mechanical switch state, only applicable to system emergency. the

(3) Comprehensive switch status

When the system has reactive power loads fluctuating faster, and all the others are normal, the composite switch of the 10kV non-impact switching multi-group capacitor bank described in the utility model generally works in the comprehensive switch state. the

The switching process of the comprehensive switch state is consistent with the switching process of the composite switch state, that is, for the rapidly fluctuating reactive load, the controller detects the basic reactive power, and puts the basic reactive power into the 10kV system in the composite switch working state mode. Leave a group of three-phase capacitors to work in the state of thyristor switching, quickly track the fluctuating reactive load, and ensure that the 10kV system does not compensate and the power factor is high;

Take a group of three-phase capacitors as an example for the state of thyristor switching,

The controller puts other groups of three-phase capacitors into the 10kV system in the action process of composite switch state, and the remaining group of three-phase capacitors works in the switching state of the thyristor. After the controller detects the closing signal of the three-phase vacuum circuit breaker , the third photoelectric transceiver module sends the closing signal to the second three-phase vacuum contactor, if the controller does not receive the closing signal from the third photoelectric transceiver module, the controller sends the second three-phase vacuum contactor a failure signal ;

If the controller receives the closing signal sent by the third photoelectric transceiver module, the controller detects the valve group failure and zero crossing detection board sends the zero crossing signal and the valve group failure signal, if the controller does not detect the valve group failure and over If the zero-crossing signal sent by the zero-crossing detection board is sent by the controller, the controller will report a failure of the synchronous signal; After the zero-crossing signal sent by the valve group failure and zero-crossing detection main board, the controller sends a trigger signal to the high-frequency pulse power supply and detects whether there is a fault signal for the high-frequency pulse power supply. If there is a fault signal for the high-frequency pulse power supply, the controller reports a power failure signal, if the high-frequency pulse power supply has no fault signal, the high-frequency pulse power supply supplies energy to the pulse energy-taking coil through the high-voltage silicone wire, and the pulse energy-taking coil drives the thyristor conductor in the high-voltage thyristor valve group through the thyristor trigger box. If it is on, the high-pressure silicon controlled rectifier valve group will be on,

A group of three-phase capacitors are put into the 10kV system. When cutting off, the controller stops triggering the high-frequency pulse power supply, then the high-voltage thyristor valve group is cut off and turned on, and a group of three-phase capacitors are cut off from the 10kV system; the switching process Completed within 20ms. the

10kV non-impact switching multi-capacitor bank composite switch works in the composite switch state and comprehensive state, which can comprehensively solve the reactive power compensation requirements of the 10kV system. There is no impact and no inrush during the switching process, which increases the life and mechanical strength of the three-phase capacitors. The life of the switch improves the reliability of the system power supply. the

The beneficial effect brought by the utility model is that the utility model proposes a 10kV non-impact switching multi-group capacitor group composite switch, and the composite switch realizes multi-group switching of one valve group and single-group operation of the valve group; three There is no impact and no inrush during the switching process of phase capacitors, which greatly improves the life of three-phase capacitors and mechanical switches, reduces the impact of switching three-phase capacitors on the system, and improves the reliability of power supply; in addition, the 10kV described in the utility model The composite switch of multi-capacitor banks without impact switching can work in three working modes of "composite switch state", "mechanical switch state" and "comprehensive switch state" to realize compensation for various reactive loads. High power factor, high cost performance. the

Description of drawings

Fig. 1 is a structural schematic diagram of a composite switch for 10kV non-impact switching multi-group capacitor banks described in the present invention. the

Detailed ways

Specific embodiment one: Referring to Fig. 1 to illustrate this embodiment, the composite switch of 10kV non-impact switching multi-group capacitor banks described in this embodiment includes a first photoelectric transceiver module 1-1, a controller 3, a high-voltage controllable Silicon valve group 2, high-frequency pulse power supply 4, pulse energy harvesting coil 5, thyristor drive box 6, valve group failure and zero-crossing detection main board 7, three-phase vacuum circuit breaker 8 and N units;

Each of the units includes a second photoelectric transceiver module 1-2, a third photoelectric transceiver module 1-3, 2 three-phase vacuum contactors, a three-phase reactor and a three-phase capacitor;

The first control signal output end of the controller 3 is connected to the control signal input end of the first photoelectric transceiver module 1-1, and the first state signal input end of the controller 3 is connected to the first photoelectric transceiver module 1-1. The state signal output terminal is connected, and the control signal output terminal of the first photoelectric transceiver module 1-1 is connected to the control terminal of the three-phase vacuum circuit breaker 8;

The second control signal output end of the controller 3 is connected with the control signal input end of the second photoelectric transceiver module 1-2, and the second state signal input end of the controller 3 is connected with the state of the second photoelectric transceiver module 1-2. The signal output terminal is connected, and the control signal output terminal of the second photoelectric transceiver module 1-2 is connected to the control terminal of the first three-phase vacuum contactor 9-1;

The third control signal output end of the controller 3 is connected to the control signal input end of the third photoelectric transceiver module 1-3, and the third state signal input end of the controller 3 is connected to the third photoelectric transceiver module 1-3. The status signal output terminal is connected, and the control signal output terminal of the third photoelectric transceiver module 1-3 is connected to the control terminal of the second three-phase vacuum contactor 9-2;

The trigger signal output end of described controller 3 is connected with the trigger signal input end of high-frequency pulse power supply 4, and the fault signal input end of this controller 3 is connected with the fault signal output end of high-frequency pulse power supply 4, and described high The power signal output end of the frequency pulse power supply 4 is connected with the power signal input end of the valve group fault and zero-crossing detection main board 7, and the fault signal output end of the valve group fault and zero-crossing detection main board 7 is connected with the valve group of the controller 3 The fault signal input terminal is connected, the zero-crossing signal output terminal of the valve group failure and zero-crossing detection main board 7 is connected with the zero-crossing signal input terminal of the controller 3, and the control signal output of the high-voltage thyristor valve group 2 is end is connected with the control signal input end of the valve group failure and zero-crossing detection main board 7, the high-frequency pulse power supply 4 passes through the pulse energy-taking coil 5 through a high-voltage silicone wire, and one end of the pulse energy-taking coil 5 can be connected with the The signal input end of the thyristor drive box 6 is connected, and the drive signal output end of the thyristor drive box 6 is connected with the drive signal input end of the high-voltage thyristor valve group 2,

The three-phase input end of the high-voltage thyristor valve group 2 is connected with one end of the three-phase vacuum circuit breaker 8 and one end of the first three-phase vacuum contactor 9-1 at the same time, and the three-phase vacuum circuit breaker 8 The control terminal is connected to the control signal output terminal of the first photoelectric transceiver module 1-1,

The three-phase output end of the high-voltage thyristor valve group 2 is connected to one end of the second three-phase vacuum contactor 9-2, and the other end of the first three-phase vacuum contactor 9-1 is connected to the second three-phase vacuum contactor 9-1 at the same time. The other end of the three-phase vacuum contactor 9-2 is connected to one end of the three-phase reactor, and the other end of the three-phase reactor is connected to one end of the three-phase capacitor. the

In this embodiment, the three-phase capacitor is used for reactive power compensation, and the three-phase reactor is used for suppressing harmonic signals. the

Specific embodiment 2: Referring to Fig. 1 to illustrate this embodiment, the difference between this embodiment and the 10kV non-impact switching multi-group capacitor bank composite switch described in specific embodiment 1 is that the said N is greater than or equal to 2 positive integer. the

Specific embodiment three: Referring to Fig. 1 to illustrate this embodiment, the difference between this embodiment and the 10kV non-impact switching multi-group capacitor bank composite switch described in specific embodiment 1 or specific embodiment 2 is that the high voltage can be The silicon-controlled valve group 2 is a two-phase high-pressure silicon-controlled valve group, and the two-phase high-pressure silicon-controlled valve group includes phase A and phase C. the

Claims (3)

1.10kV non-impact switching composite switch for multi-capacitor banks, characterized in that it includes a first photoelectric transceiver module (1-1), a controller (3), a high-voltage thyristor valve group (2), a high-frequency pulse Power supply (4), pulse energy coil (5), thyristor drive box (6), valve block failure and zero-crossing detection main board (7), three-phase vacuum circuit breaker (8) and N units; Each unit includes a second photoelectric transceiver module (1-2), a third photoelectric transceiver module (1-3), two three-phase vacuum contactors, one three-phase reactor and one three-phase capacitor; The first control signal output end of the controller (3) is connected to the control signal input end of the first photoelectric transceiver module (1-1), and the first state signal input end of the controller (3) is connected to the first photoelectric transceiver module (1-1). The status signal output terminal of the transceiver module (1-1) is connected, and the control signal output terminal of the first photoelectric transceiver module (1-1) is connected to the control terminal of the three-phase vacuum circuit breaker (8); The second control signal output terminal of the controller (3) is connected to the control signal input terminal of the second photoelectric transceiver module (1-2), and the second state signal input terminal of the controller (3) is connected to the second photoelectric transceiver module (1-2). The state signal output terminal of the module (1-2) is connected, and the control signal output terminal of the second photoelectric transceiver module (1-2) is connected to the control terminal of the first three-phase vacuum contactor (9-1); The third control signal output terminal of the controller (3) is connected to the control signal input terminal of the third photoelectric transceiver module (1-3), and the third state signal input terminal of the controller (3) is connected to the third photoelectric transceiver module (1-3). The state signal output terminal of the transceiver module (1-3) is connected, and the control signal output terminal of the third photoelectric transceiver module (1-3) is connected to the control terminal of the second three-phase vacuum contactor (9-2); The trigger signal output terminal of the controller (3) is connected to the trigger signal input terminal of the high-frequency pulse power supply (4), and the fault signal input terminal of the controller (3) is connected to the fault signal of the high-frequency pulse power supply (4). The output terminal is connected, the power signal output terminal of the high-frequency pulse power supply (4) is connected to the power signal input terminal of the valve group fault and zero-crossing detection main board (7), and the valve group fault and zero-crossing detection main board ( 7) The fault signal output end of the controller (3) is connected to the valve group fault signal input end, and the zero-crossing signal output end of the valve group fault and zero-crossing detection main board (7) is connected to the fault signal input end of the controller (3). The zero signal input terminal is connected, the control signal output terminal of the high-voltage thyristor valve group (2) is connected to the control signal input terminal of the valve group failure and zero-crossing detection main board (7), and the high-frequency pulse power supply ( 4) Through the high-voltage silicone wire through the pulse energy acquisition coil (5), one end of the pulse energy acquisition coil (5) is connected to the signal input end of the thyristor drive box (6), and the thyristor drive The drive signal output end of the box (6) is connected to the drive signal input end of the high-voltage thyristor valve group (2), The three-phase input end of the high-voltage thyristor valve group (2) is simultaneously connected with one end of the three-phase vacuum circuit breaker (8) and one end of the first three-phase vacuum contactor (9-1), The three-phase output end of the high-voltage thyristor valve group (2) is connected to one end of the second three-phase vacuum contactor (9-2), and the other end of the first three-phase vacuum contactor (9-1) is simultaneously It is connected with the other end of the second three-phase vacuum contactor (9-2) and one end of the three-phase reactor, and the other end of the three-phase reactor is connected with one end of the three-phase capacitor. the 2 . The composite switch for 10 kV non-impact switching multi-capacitor banks according to claim 1 , wherein said N is a positive integer greater than or equal to 2. 3 . the 3. The composite switch for 10kV non-impact switching multi-capacitor banks according to claim 1 or 2, characterized in that, the high-voltage thyristor valve group (2) is a two-phase high-voltage thyristor valve group, The two-phase high-pressure thyristor valve group includes phase A and phase C. the

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