A device and method for inputting a black start release grid-connected signal to an excitation and speed regulator system

Abstract

The invention discloses a device for inputting a black start release grid-connected signal to an excitation and speed regulator system, comprising a battery module, a circuit breaker position input terminal, a relay module, a circuit breaker position output terminal and a release switch; the device controls the working state of a relay in the relay module through the release switch, and a grid-connected circuit breaker closing position signal is transmitted to an excitation system or a speed regulation system grid-connected circuit breaker closing signal input channel through a common terminal and a normally closed contact of the relay module; when the release switch is operated to the release position, the normally closed contact of the relay in the relay module is disconnected, and the grid-connected circuit breaker closing position signal cannot be input to the excitation system or the speed regulation system; when the release switch is operated to the normal operating position, the grid-connected circuit breaker closing position signal can be input to the excitation system or the speed regulation system; the release switch is used to drive the relay module to realize switching between two working modes of normal operation and black start of the unit, which is beneficial to the safety of the equipment body of the excitation system and the speed regulation system and convenient for on-site use and operation; a worker can realize the release of the black start release grid-connected signal by simple operation, so that the black start can be carried out smoothly, the disadvantages of the traditional manual release method are overcome, and the efficiency of adjusting the equipment state before the black start is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of black start, and in particular relates to a device and method for black start to release a grid-connected signal input to an excitation and speed regulator system. Background Art

[0002] As the black start of the power system plays an increasingly important role in the power system, it has received much attention from power generation companies, power grids, and energy regulatory agencies in recent years. Although there have been very few major blackouts caused by natural disasters in the history of the power system, it does not mean that there will be no major blackouts in the power grid. In today's world, various power generation equipment is developing towards informatization and big data, and almost all units have been transformed into digital control. However, several major blackouts caused by human attacks on network systems in the world have given the power generation industry a big warning. Any programmable automatic device may have unknown technical loopholes. These problems highlight the importance of black start in a country. The control methods of power plants in normal operation and black start are different. How to quickly switch between the two methods after a power outage can save precious operation time for black start. When the grid-connected circuit breaker is in the closed position, the excitation system and the speed control system believe that the generator has been connected to the grid, and the control logic is changed to the grid-connected operation logic mode. When the grid-connected circuit breaker is in the closed position, the excitation and speed control systems cannot achieve the fixed speed and zero-start voltage boost functions when the generator with transformer is tested during black start, which limits the zero-start voltage boost function of the generator with the main transformer and the line. At the same time, the speed governor cannot achieve normal automatic startup. The currently known black start release grid-connected signal input to the excitation and speed governor system is manual de-excitation or the speed governor system takes out the corresponding line, and the same work needs to be repeated every time a black start is performed, which brings inconvenience to the site. At the same time, when the wiring is restored, it is very likely that the terminal fixing end will be loose, resulting in poor contact, leaving hidden dangers for normal operation, which is not conducive to the maintenance and operation of the equipment. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a device and method for inputting a black start release grid-connected signal to an excitation and speed regulator system, which can realize the release of the black start grid-connected signal through simple operation of the staff, so that the black start can be carried out smoothly, overcomes the disadvantages of the traditional manual release method, and improves the efficiency of equipment status adjustment before black start.

[0004] The present invention is achieved through the following technical solutions:

[0005] A device for inputting a black start release grid-connected signal to an excitation and speed regulator system, comprising a circuit breaker position input terminal, a relay module, a circuit breaker position output terminal and a release switch;

[0006] The input end of the circuit breaker position input terminal is connected to the grid-connected circuit breaker closing position signal, and the output end is connected to the common end of the auxiliary contact of the relay module. The circuit breaker position input terminal is used to transfer the grid-connected circuit breaker closing position signal to the relay module, and the normally closed contact of the relay module is connected to the input end of the circuit breaker position output terminal;

[0007] The relay module is used to disconnect the grid-connected circuit breaker closing position signal from the circuit breaker position input terminal to the circuit breaker position output terminal;

[0008] The output end of the circuit breaker position output terminal is connected to the closing signal input channel of the grid-connected circuit breaker of the excitation system or the speed regulation system, and the circuit breaker position output terminal is used to connect the closing position signal of the grid-connected circuit breaker to the closing signal input channel of the grid-connected circuit breaker of the excitation system or the speed regulation system;

[0009] The release switch is connected to the relay module drive port and is used to switch the working and non-working states of the control relay module;

[0010] The circuit breaker position input terminal and the circuit breaker position output terminal adopt single-row three-terminal terminals. The input port of the circuit breaker position input terminal is a screw-fixed port on the upper part of the terminal, and the output ports are all pins at the lower part of the terminal. The input port of the circuit breaker position output terminal is a pin at the lower part of the terminal, and the output port is a screw-fixed port on the upper part of the terminal. The first pin, the second pin, and the third pin of the circuit breaker position input terminal are respectively connected to the three-phase closing signals of the grid-connected circuit breakers A, B, and C. The first pin, the second pin, and the third pin of the circuit breaker position output terminal respectively output the three-phase closing signals of the grid-connected circuit breakers A, B, and C, and provide them to the excitation system or the speed regulation system.

[0011] Preferably, it also includes a battery module, wherein the positive and negative output terminals of the battery module are connected to the relay module for powering the relay module, and the positive electrode of the battery module is connected to the common terminal of the release switch for providing a voltage control signal for the release switch.

[0012] Furthermore, the battery module is composed of three 1.5V AA batteries connected in series.

[0013] Preferably, the relay module includes a power supply interface, a relay, a working status display circuit, a driving transistor, a freewheeling diode and a base resistor. The working status display circuit is connected in parallel at both ends of the relay winding, the freewheeling diode is connected in parallel at both ends of the relay winding, the cathode of the freewheeling diode is connected to the positive pole of the relay winding, the anode of the freewheeling diode is connected to the emitter of the driving transistor, the positive pole of the power supply interface is connected to the cathode of the freewheeling diode, the negative pole is connected to the collector of the driving transistor, the emitter of the driving transistor is connected to the anode of the freewheeling diode, and the base resistor is connected to the base of the driving transistor; the working status display circuit includes a light-emitting diode and a current-limiting resistor, and the light-emitting diode and the current-limiting resistor are connected in series; the positive pole of the power supply interface is connected to the positive pole of the battery module, and the negative pole is connected to the negative pole of the battery module.

[0014] Furthermore, the relay has three pairs of normally closed auxiliary contacts and three pairs of normally open auxiliary contacts, the normally closed contacts are used to connect the A, B, and C phase closing position signals of the grid-connected circuit breaker from the circuit breaker position input terminals to the circuit breaker position output terminals, and the normally open contacts are used to disconnect the A, B, and C phase closing position signals of the grid-connected circuit breaker from the circuit breaker position input terminals to the circuit breaker position output terminals.

[0015] Preferably, the release switch has a common end, a normally open switch end and a normally closed switch end. The normally open switch end is connected to the base of the driving transistor via the base resistor in the relay module, and the common end is connected to the positive pole of the power supply interface. When the release switch is closed, the common end is connected to the normally open switch end to control the action of the relay in the relay module. When the release switch is opened, the common end is disconnected from the normally open switch end, and the relay in the relay module is in a power-off and non-actuating state; the normally open switch end is closed for the release state, and the normally open switch end is disconnected for the normal operating state.

[0016] Furthermore, the release switch adopts a key-controlled rotary self-locking switch, and when in use, the key needs to be inserted to perform a closing or opening operation.

[0017] A method for inputting a black start release grid connection signal to an excitation and speed regulator system, based on any one of the above-mentioned devices, comprising the following steps:

[0018] 1) Confirm that the electrical equipment of the unit to be started is in a power-off state and proceed to step 2);

[0019] 2) Prepare two devices for black start release grid connection signal input to the excitation and speed regulator systems, numbered as the first release device and the second release device, install the first release device on the excitation system switch input channel guide rail, install the second release device on the speed regulation system switch input channel guide rail, and proceed to step 3);

[0020] 3) Remove the original A, B, C phase closing signals of the grid-connected circuit breaker to the switch input channel signal of the excitation system, respectively connect the A, B, C phase closing signals of the grid-connected circuit breaker to the 1st, 2nd and 3rd pins of the circuit breaker position input terminal of the first device, respectively connect the 1st, 2nd and 3rd pins of the circuit breaker position output terminal to the A, B, C phase closing signal channel of the switch input of the excitation system, respectively, insert the first release device operation key into the release switch, operate the release switch to the release position, check and confirm that the A, B, C phase closing signals of the grid-connected circuit breaker have been disconnected from the A, B, C phase closing signal channel of the switch input of the excitation system, and proceed to step 4);

[0021] 4) Remove the original A, B, C phase closing signals of the grid-connected circuit breaker to the switch input channel signal of the speed control system, respectively connect the A, B, C phase closing signals of the grid-connected circuit breaker to the 1st, 2nd and 3rd pins of the circuit breaker position input terminal of the second device, respectively connect the 1st, 2nd and 3rd pins of the circuit breaker position output terminal to the A, B, C phase closing signal channels of the switch input of the speed control system, respectively, insert the second release device operation key into the release switch, operate the release switch to the release position, check and confirm that the A, B, C phase closing signals of the grid-connected circuit breaker have been disconnected from the A, B, C phase closing signal channels of the switch input of the speed control system, and proceed to step 5);

[0022] 5) After the black start is completed, operate the first release device to release the switch to restore normal operation position, check and confirm that the A, B, C phase closing signals of the grid-connected circuit breaker are connected with the A, B, C phase closing signal channels of the excitation system switch input, pull out the key of the first release device, hand it over to a special person for safekeeping, and proceed to step 6);

[0023] 6) After the black start is completed, operate the second release device to release the switch to restore normal operation position, check and confirm that the A, B, and C phase closing signals of the grid-connected circuit breaker have been connected with the A, B, and C phase closing signal channels of the speed control system switch input, pull out the key of the second release device, and hand it over to a designated person for safekeeping.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] The present invention controls the working state of the relay in the relay module through a release switch, and the closing position signal of the grid-connected circuit breaker is transmitted to the grid-connected circuit breaker closing signal input channel of the excitation system or the speed regulation system through the common end and the normally closed contact of the relay module. When the release switch is operated to the release position, the normally closed contact of the relay in the relay module is disconnected, and the closing position signal of the grid-connected circuit breaker cannot be input to the excitation system or the speed regulation system. When the release switch is operated to the normal operating position, the closing position signal of the grid-connected circuit breaker can be input to the excitation system or the speed regulation system. The release switch is used to drive the relay module to realize the switching between the two working modes of the normal operation and the black start of the unit, which is beneficial to the equipment body safety of the excitation system and the speed regulation system and convenient for on-site use and operation.

[0026] Furthermore, the release switch of the present invention adopts a key-controlled rotary self-locking switch, which is kept and operated by a dedicated person to prevent misoperation in both normal operation and black start states, thereby ensuring the reliability of the release operation.

[0027] Furthermore, the present invention can be directly installed on the switch quantity input channel guide rail of the excitation system or the speed regulation system. On-site installation only requires connecting the device in series with the original grid-connected circuit breaker closing signal to the terminal of the excitation system or the speed regulation system, which is convenient for on-site installation and use.

[0028] Furthermore, when the unit of the present invention operates normally, the relay in the relay module is in a power-off state, and the normally closed contact is closed, thereby maintaining good conductivity of the terminal for inputting the grid-connected circuit breaker signal to the excitation system or the speed regulation system. When a black start is required, the relay in the relay module is in an energized action state, and the grid-connected circuit breaker signal cannot be input to the terminal of the excitation system or the speed regulation system, and the generator, transformer and line zero-start voltage boost and constant speed operation can be performed on site.

[0029] Furthermore, the present invention does not need to change the internal control logic of the excitation system or the speed regulation system, thus reducing the workload of releasing the closing signal of the grid-connected circuit breaker during a black start. Even when a black start is not performed, the device does not need to be dismantled, and the release switch can flexibly switch the working mode according to the application situation.

[0030] Furthermore, the present invention is easy to promote and use on site, and is particularly suitable for hydropower and gas turbine units with black start capability, and can also be used in thermal power units. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a principle block diagram of the device of the present invention.

[0032] Figure 2 The schematic diagram of the circuit of the device of the present invention is shown in FIG.

[0033] In the figure: battery module 1; circuit breaker position input terminal 2; relay module 3; circuit breaker position output terminal 4; release switch 5. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0035] The present invention can solve the shortcomings and inconveniences of manually releasing the signal from the grid-connected circuit breaker to the excitation system and the speed regulation system during black start, and fills the technical gap of the current device without black start release grid-connected signal input to the excitation and speed regulation system.

[0036] The present invention provides a device and method for inputting a black start release grid-connected signal to an excitation and speed regulator system, such as Figure 1 As shown, it includes a circuit breaker position input terminal 2, a relay module 3, a circuit breaker position output terminal 4 and a release switch 5. The input end of the circuit breaker position input terminal 2 is connected to the grid-connected circuit breaker closing position signal, and the output end is connected to the common end of the auxiliary contact of the relay module 3. The circuit breaker position input terminal 2 is used to transfer the grid-connected circuit breaker closing position signal to the relay module 3. The normally closed contact of the relay module 3 is connected to the input end of the circuit breaker position output terminal 4. The relay module 3 is used to disconnect the grid-connected circuit breaker closing position signal from the circuit breaker position input terminal 2 to the circuit breaker position output terminal 4. The output end of the circuit breaker position output terminal 4 is connected to the excitation system or speed regulation system grid-connected circuit breaker closing signal input channel. The circuit breaker position output terminal 4 is used to connect the grid-connected circuit breaker closing position signal to the excitation system or speed regulation system grid-connected circuit breaker closing signal input channel. The release switch 5 is connected to the drive port of the relay module 3 and is used to switch the control relay module 3 between the working and non-working states.

[0037] In this embodiment, a battery module 1 is also included, and the positive and negative output terminals of the battery module 1 are connected to the relay module 3 for powering the relay module 3. The positive electrode of the battery module 1 is connected to the common terminal of the release switch 5 for providing a voltage control signal for the release switch 5.

[0038] In this embodiment, the battery module 1 is composed of three 1.5V AA batteries connected in series.

[0039] In this embodiment, the circuit breaker position input terminal 2 and the circuit breaker position output terminal 4 adopt single-row three-terminal terminals. The input port of the circuit breaker position input terminal 2 is a screw-fixed port on the upper part of the terminal, and the output ports are all pins on the lower part of the terminal. The input port of the circuit breaker position output terminal 4 is a pin on the lower part of the terminal, and the output port is a screw-fixed port on the upper part of the terminal. The first pin, the second pin, and the third pin of the circuit breaker position input terminal 2 are respectively connected to the three-phase closing signals of the grid-connected circuit breakers A, B, and C. The first pin, the second pin, and the third pin of the circuit breaker position output terminal 4 respectively output the three-phase closing signals of the grid-connected circuit breakers A, B, and C, and provide them to the excitation system or the speed regulation system.

[0040] In this embodiment, the relay module 3 includes a power interface, a relay, a working status display circuit, a driving transistor, a freewheeling diode and a base resistor. The working status display circuit is connected in parallel at both ends of the relay winding, the freewheeling diode is connected in parallel at both ends of the relay winding, the cathode of the freewheeling diode is connected to the positive pole of the relay winding, the anode of the freewheeling diode is connected to the emitter of the driving transistor, the positive pole of the power interface is connected to the cathode of the freewheeling diode, the negative pole is connected to the collector of the driving transistor, the emitter of the driving transistor is connected to the anode of the freewheeling diode, and the base resistor is connected to the base of the driving transistor; the working status display circuit includes a light-emitting diode and a current-limiting resistor, and the light-emitting diode and the current-limiting resistor are connected in series; the positive pole of the power interface is connected to the positive pole of the battery module 1, and the negative pole is connected to the negative pole of the battery module 1.

[0041] In this embodiment, the relay has three pairs of normally closed auxiliary contacts and three pairs of normally open auxiliary contacts. The normally closed contacts are used to connect the A, B, and C phase closing position signals of the grid-connected circuit breaker from the circuit breaker position input terminal 2 to the circuit breaker position output terminal 4, and the normally open contacts are used to disconnect the A, B, and C phase closing position signals of the grid-connected circuit breaker from the circuit breaker position input terminal 2 to the circuit breaker position output terminal 4.

[0042] In this embodiment, the release switch 5 has a common end, a normally open switch end and a normally closed switch end. The normally open switch end is connected to the base of the driving transistor via the base resistor in the relay module 3, and the common end is connected to the positive pole of the power supply interface. When the release switch 5 is closed, the common end is connected to the normally open switch end to control the action of the relay in the relay module 3. When the release switch 5 is opened, the common end is disconnected from the normally open switch end, and the relay in the relay module 3 is in a power-off and non-actuating state; the normally open switch end is closed for the release state, and the normally open switch end is opened for the normal operating state.

[0043] In this embodiment, the release switch 5 is a key-controlled rotary self-locking switch, and when in use, the staff needs to insert the key to perform the closing and opening operations.

[0044] In this embodiment, Figure 2As shown, the circuit breaker position input terminal 2 is the closing position input terminal DL1, the circuit breaker position output terminal 4 is the closing position output terminal L1, the release switch 5 is the switch S1, the relay module 3 includes a power interface P1, a relay J1, a working state display circuit, a driving transistor Q1, a freewheeling diode D1 and a base resistor R1, and the working state display circuit includes a current limiting resistor R2 and a light emitting diode D2; the first pin, the second pin, and the third pin of the closing position input terminal DL1 are respectively connected to the grid-connected circuit breaker A The 1st, 2nd and 3rd pins of the closing position input terminal DL1 are connected to the 8th, 6th and 3rd pins of the relay J1 respectively. The 1st, 2nd and 3rd pins of the closing position output terminal L1 are connected to the A, B and C phase closing signal input ports of the excitation system or the speed regulation system grid-connected circuit breaker respectively. The 1st, 2nd and 3rd pins of the closing position output terminal L1 are connected to the 9th, 7th and 4th pins of the relay J1 respectively. The power interface P 1The first pin is connected to the positive electrode of the battery module 1, the second pin of the power interface P1 is connected to the negative electrode of the battery module 1, the collector of the driving transistor Q1 is connected to the second pin of the power interface P1, the emitter of the driving transistor Q1 is connected to the first pin of the power interface P1 through the second pin and the first pin of the relay J1, the anode of the freewheeling diode D1 is connected to the second pin of the relay J1, and the cathode is connected to the first pin of the relay J1, one end of the current limiting resistor R2 is connected to the first pin of the power interface P1, and the other end is connected to the first pin of the power interface P1 through the light emitting diode D2 It is connected to the second pin of relay J1, the common end of switch S1 is connected to the first pin of power interface P1, and the normally open port is connected to the base of driving transistor Q1 through base resistor R1; the first, second and third pins of closing position output terminal L1 are the closing position input ports of grid-connected circuit breaker of the device, and the first, second and third pins of closing position output terminal L1 are the closing position output ports of grid-connected circuit breaker, and the power interface P1 is connected to the positive and negative poles of the output of battery module 1 to provide working power for the entire device.

[0045] A method for inputting a black start disconnection signal to an excitation and speed regulator system comprises the following steps:

[0046] 1. Confirm that the electrical equipment of the unit to be started is in a power-off state, and proceed to step 2;

[0047] 2 Prepare two devices for black start release grid connection signal input to the excitation and speed regulator systems, numbered as the first release device and the second release device, install the first release device on the excitation system switch input channel rail, install the second release device on the speed regulation system switch input channel rail, and go to step 3;

[0048] 3. Remove the original A, B, C phase closing signals of the grid-connected circuit breaker to the excitation system switch input channel signal, respectively connect the A, B, C phase closing signals of the grid-connected circuit breaker to the 1st, 2nd, and 3rd pins of the circuit breaker position input terminal 2 of the first device, respectively connect the 1st, 2nd, and 3rd pins of the circuit breaker position output terminal 4 to the excitation system switch input A, B, and C phase closing signal channels, respectively, insert the first release device operation key into the release switch 5, operate the release switch 5 to the release position, check and confirm that the A, B, and C phase closing signals of the grid-connected circuit breaker have been disconnected from the A, B, and C phase closing signal channels of the excitation system switch input, and go to step 4;

[0049] 4. Remove the original A, B, C phase closing signals of the grid-connected circuit breaker to the switch input channel signal of the speed control system, respectively connect the A, B, C phase closing signals of the grid-connected circuit breaker to the 1st, 2nd, and 3rd pins of the circuit breaker position input terminal 2 of the second device, respectively connect the 1st, 2nd, and 3rd pins of the circuit breaker position output terminal 4 to the A, B, and C phase closing signal channels of the switch input of the speed control system, respectively, insert the second release device operation key into the release switch 5, operate the release switch 5 to the release position, check and confirm that the A, B, and C phase closing signals of the grid-connected circuit breaker have been disconnected from the A, B, and C phase closing signal channels of the switch input of the speed control system, and go to step 5;

[0050] 5 After the black start is completed, operate the first release device release switch 5 to restore the normal operation position, check and confirm that the A, B, C phase closing signals of the grid-connected circuit breaker are connected with the A, B, C phase closing signal channels of the excitation system switch input, pull out the first release device key, hand it over to a special person for safekeeping, and go to step 6;

[0051] 6 After the black start is completed, operate the second release device to release the switch 5 to restore the normal operation position, check and confirm that the A, B, and C phase closing signals of the grid-connected circuit breaker have been connected with the A, B, and C phase closing signal channels of the speed control system switch input, pull out the key of the second release device, and hand it over to a designated person for safekeeping.

[0052] The above is only a preferred embodiment of the patent of the present invention, and does not impose any limitation on the patent of the present invention. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A device for inputting a black start release grid connection signal to an excitation and speed regulator system, characterized in that: It comprises a circuit breaker position input terminal (2), a relay module (3), a circuit breaker position output terminal (4) and a release switch (5); The input end of the circuit breaker position input terminal (2) is connected to the grid-connected circuit breaker closing position signal, and the output end is connected to the common end of the auxiliary contact of the relay module (3). The circuit breaker position input terminal (2) is used to transfer the grid-connected circuit breaker closing position signal to the relay module (3), and the normally closed contact of the relay module (3) is connected to the input end of the circuit breaker position output terminal (4); The relay module (3) is used to disconnect the grid-connected circuit breaker closing position signal from the circuit breaker position input terminal (2) to the circuit breaker position output terminal (4); The output end of the circuit breaker position output terminal (4) is connected to the excitation system or the speed regulation system grid-connected circuit breaker closing signal input channel, and the circuit breaker position output terminal (4) is used to connect the grid-connected circuit breaker closing position signal to the excitation system or the speed regulation system grid-connected circuit breaker closing signal input channel; The release switch (5) is connected to the driving port of the relay module (3) and is used to switch the working and non-working states of the control relay module (3); The circuit breaker position input terminal (2) and the circuit breaker position output terminal (4) adopt single-row three-terminal terminals. The input port of the circuit breaker position input terminal (2) is a screw-fixed port on the upper part of the terminal, and the output ports are all pins on the lower part of the terminal. The input port of the circuit breaker position output terminal (4) is a pin on the lower part of the terminal, and the output port is a screw-fixed port on the upper part of the terminal. The first pin, the second pin, and the third pin of the circuit breaker position input terminal (2) are respectively connected to the three-phase closing signals of the grid-connected circuit breakers A, B, and C. The first pin, the second pin, and the third pin of the circuit breaker position output terminal (4) respectively output the three-phase closing signals of the grid-connected circuit breakers A, B, and C, and provide them to the excitation system or the speed regulation system.

2. The device for inputting a black start release grid connection signal to an excitation and speed regulator system according to claim 1, characterized in that: It also comprises a battery module (1), wherein the positive and negative output terminals of the battery module (1) are connected to the relay module (3) for supplying power to the relay module (3), and the positive terminal of the battery module (1) is connected to the common terminal of the release switch (5) for providing a voltage control signal to the release switch (5).

3. The device for inputting a black start release grid connection signal to an excitation and speed regulator system according to claim 2, characterized in that: The battery module (1) is composed of three 1.5V AA batteries connected in series.

4. The device for inputting a black start release grid connection signal to an excitation and speed regulator system according to claim 1, characterized in that: The relay module (3) comprises a power supply interface, a relay, a working state display circuit, a driving transistor, a freewheeling diode and a base resistor. The working state display circuit is connected in parallel at both ends of the relay winding package, the freewheeling diode is connected in parallel at both ends of the relay winding package, the cathode of the freewheeling diode is connected to the positive electrode of the relay winding package, the anode of the freewheeling diode is connected to the emitter of the driving transistor, the positive electrode of the power supply interface is connected to the cathode of the freewheeling diode, the negative electrode is connected to the collector of the driving transistor, the emitter of the driving transistor is connected to the anode of the freewheeling diode, and the base resistor is connected to the base of the driving transistor; the working state display circuit comprises a light emitting diode and a current limiting resistor, and the light emitting diode and the current limiting resistor are connected in series; the positive electrode of the power supply interface is connected to the positive electrode of the battery module (1), and the negative electrode is connected to the negative electrode of the battery module (1).

5. The device for inputting a black start release grid connection signal to an excitation and speed regulator system according to claim 4, characterized in that: The relay has three pairs of normally closed auxiliary contacts and three pairs of normally open auxiliary contacts, the normally closed contacts are used to connect the A, B, and C phase closing position signals of the grid-connected circuit breaker from the circuit breaker position input terminal (2) to the circuit breaker position output terminal (4), and the normally open contacts are used to disconnect the A, B, and C phase closing position signals of the grid-connected circuit breaker from the circuit breaker position input terminal (2) to the circuit breaker position output terminal (4).

6. The device for inputting a black start release grid connection signal to an excitation and speed regulator system according to claim 1, characterized in that: The release switch (5) has a common end, a normally open switch end and a normally closed switch end. The normally open switch end is connected to the base of the driving transistor via the base resistor in the relay module (3), and the common end is connected to the positive electrode of the power supply interface. When the release switch (5) is closed, the common end is connected to the normally open switch end to control the action of the relay in the relay module (3). When the release switch (5) is opened, the common end is disconnected from the normally open switch end, and the relay in the relay module (3) is in a power-off and non-actuating state. The normally open switch end is closed in the release state, and the normally open switch end is opened in the normal operating state.

7. The device for inputting a black start release grid connection signal to an excitation and speed regulator system according to claim 6, characterized in that: The release switch (5) is a key-controlled rotary self-locking switch, and when in use, a key needs to be inserted to perform a closing or opening operation.

8. A method for inputting a black start disconnection signal to an excitation and speed regulator system, characterized in that: The device according to any one of claims 1 to 7 comprises the following steps: 1) Confirm that the electrical equipment of the unit to be started is in a power-off state and proceed to step 2); 2) Prepare two devices for black start release grid connection signal input to the excitation and speed regulator systems, numbered as the first release device and the second release device, install the first release device on the excitation system switch input channel guide rail, install the second release device on the speed regulation system switch input channel guide rail, and proceed to step 3); 3) Remove the original A, B, C phase closing signals of the grid-connected circuit breaker to the excitation system switch input channel signal, respectively connect the A, B, C phase closing signals of the grid-connected circuit breaker to the 1st, 2nd, and 3rd pins of the circuit breaker position input terminal of the first device, respectively connect the 1st, 2nd, and 3rd pins of the circuit breaker position output terminal to the A, B, and C phase closing signal channels of the excitation system switch input, respectively, insert the first release device operation key into the release switch (5), operate the release switch to the release position, check and confirm that the A, B, and C phase closing signals of the grid-connected circuit breaker have been disconnected from the A, B, and C phase closing signal channels of the excitation system switch input, and enter step 4); 4) Remove the original A, B, C phase closing signals of the grid-connected circuit breaker to the switch input channel signal of the speed control system, respectively connect the A, B, C phase closing signals of the grid-connected circuit breaker to the first, second and third pins of the circuit breaker position input terminal (2) of the second device, respectively connect the first, second and third pins of the circuit breaker position output terminal to the A, B, C phase closing signal channels of the switch input of the speed control system, respectively, insert the second release device operation key into the release switch (5), operate the release switch to the release position, check and confirm that the A, B, C phase closing signals of the grid-connected circuit breaker have been disconnected from the A, B, C phase closing signal channels of the switch input of the speed control system, and enter step 5); 5) After the black start is completed, operate the first release device to release the switch to restore normal operation position, check and confirm that the A, B, C phase closing signals of the grid-connected circuit breaker are connected with the A, B, C phase closing signal channels of the excitation system switch input, pull out the key of the first release device, hand it over to a special person for safekeeping, and proceed to step 6); 6) After the black start is completed, operate the second release device to release the switch to restore normal operation position, check and confirm that the A, B, and C phase closing signals of the grid-connected circuit breaker have been connected with the A, B, and C phase closing signal channels of the speed control system switch input, pull out the key of the second release device, and hand it over to a designated person for safekeeping.

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