Simulation circuit breaker and method specially used for spare power automatic switching debugging

Abstract

The invention relates to a simulation circuit breaker and method specially used for spare power automatic switching debugging, and belongs to the field of power circuit breakers, and the simulation circuit breaker comprises a portable power supply, a closing loop, a closing position indication loop, a tripping position indication loop, an opening loop, an after-closing indication loop, a protection tripping loop, a stealing tripping maintaining loop and a stealing tripping indication loop. Three single simulation circuit breakers are integrated into an integrated device capable of simulating three circuit breakers at the same time, simulation of the three circuit breakers needed by spare power automatic switching logic debugging is achieved, after-closing and tripping instructions are additionally arranged, the equipment logic debugging is simple, efficiency is high, operability is good, and meanwhile the problems that the size is large, the weight is large, and the debugging cost is low are solved. And the portability is poor.

Description

Technical Field

[0001] The invention relates to a simulation circuit breaker and method specially used for standby automatic switching debugging, belonging to the field of power circuit breakers. Background Art

[0002] The circuit breaker is one of the most important and complex electrical equipment in the high-voltage switchgear of the power system. It can connect and disconnect the load current during normal operation. When the system fails, it can quickly disconnect the short-circuit current under the action of relay protection. Therefore, the circuit breaker undertakes the dual tasks of control and protection. However, due to the complexity of the circuit breaker control circuit, the action is usually completed by the operating mechanism (such as spring energy storage type, hydraulic type, electromagnetic type and other operating mechanisms), so the circuit breaker is relatively expensive and large in size. Therefore, scientific research institutions generally use simulated circuit breakers to simulate the functions of circuit breakers, which can be used for the whole set of tests of complete sets of relay protection devices. It can truly simulate the tripping and closing of the circuit breaker, avoiding the circuit breaker's repeated opening and closing due to repeated whole set tests, thereby reducing the impact on the performance of the circuit breaker itself.

[0003] However, most similar products use DC contactors to simulate circuit breaker auxiliary contacts, and wound resistors to simulate circuit breaker tripping and closing coils. The working power supply uses AC 220V, and the DC 220V voltage is output through the rectification link. Closing (manual closing, protection closing) and opening (manual opening, protection opening) require electromagnetic current type relays to form a self-holding circuit.

[0004] Therefore, similar products have many problems and shortcomings:

[0005] 1. There is no indicator light after closing and circuit breaker tripping. Manual closing and protection closing both cause the circuit breaker to close, and manual opening and protection opening also cause the circuit breaker to trip, which cannot reflect the specific closing and opening process. For the conventional logic debugging of the backup automatic transfer device, the need for tripping and closing telesignals is necessary. For special logic such as the tripping of the backup automatic transfer device, debugging is also more difficult due to the lack of a tripping indicator.

[0006] 2. When the DC contactor contacts are disconnected, the voltage generated in the circuit is too high, the arc is not easy to extinguish, and arc extinguishing measures are difficult. At the same time, because the arc extinguishing chamber is large and complex, the DC contactor is large in size, heavy in weight, and high in cost.

[0007] 3. The volume of the wound resistor is large, and the resistance value is low. Due to the structure and other reasons, its distributed capacitance and inductance coefficient are relatively large. Generally, the resistance wire made of nickel-chromium, manganese-copper and other alloys is wound on the insulating skeleton in one or more layers, which also leads to heavy weight.

[0008] 4. For electromagnetic current relays used for closing and opening, the operating current and return current must be considered. If the circuit resistance is too large, the operating current cannot be reached, causing the relay to not operate; similarly, if the circuit resistance is too small, the current is too large, causing the relay to not return.

[0009] 5. The working power supply adopts AC 220V, which needs to be rectified to output DC. There are certain safety risks in taking power from AC power (one machine, one switch, one protection). Even if there is AC power, it may be far away and difficult to get power. There is even a problem that there is no suitable AC power nearby.

[0010] 6. Each component is fixedly packaged, making it difficult to replace if damaged.

[0011] To sum up, similar products have the problems of no closing and tripping indication, which makes the backup automatic logic debugging complicated, inefficient and poor operability; they are large in size and weight, and have poor portability; the working power supply is 220V, which makes it difficult to obtain power and poses safety risks; the electromagnetic current relay needs to consider the operating current and return current caused by the loop resistance, and the design is complicated; each component is fixedly packaged, and it is difficult to replace it if it is damaged. Summary of the invention

[0012] According to the problem described in the background, the problem to be solved by the present invention is: to provide a simulation circuit breaker and method specially used for standby automatic switching debugging. On the basis of a single simulation circuit breaker, a modular and integrated design is carried out, and three single simulation circuit breakers are concentrated into an integrated device that can simulate three circuit breakers at the same time, so as to realize the simulation of three circuit breakers required for standby automatic switching logic debugging, and add closing and tripping indications to make the equipment logic debugging simple, efficient and easy to operate, and at the same time solve the problems of large size, heavy weight and poor portability.

[0013] To achieve the above object, the present invention provides the following technical solutions: Provide a simulated circuit breaker specially used for standby automatic commissioning, including a portable power supply, a closing circuit, a closing position indication circuit, a tripping position indication circuit, an opening circuit, a closing indication circuit, a protection tripping circuit, a sneak tripping holding circuit, a sneak tripping indication circuit, a tripping position output circuit and a closing output circuit;

[0014] The closing circuit, the closing position indication circuit, the tripping position indication circuit, the opening circuit, the closing indication circuit, the protection closing circuit, the sneak trip holding circuit and the sneak trip indication circuit are sequentially connected in parallel to form a parallel circuit;

[0015] The closing circuit includes a closing button SB1 contact, an opening button SB2 contact, a protection closing input contact, a relay KA1, a relay KA1 contact and a relay KA3 contact. The closing button SB1 contact, the opening button SB2 contact, the relay KA1 and the relay KA3 contact are connected in series, the protection closing input contact is connected in parallel with the closing button SB1 contact and the opening button SB2 contact, and the relay KA1 contact is connected in parallel with the closing button SB1 contact, so as to ensure that KA1 is closed after the SB1 button is pressed;

[0016] The closing position indicating circuit comprises a relay KA1 contact and a closing position lamp HD, and the relay KA1 contact is connected in series with the closing position lamp HD;

[0017] The jump position indication circuit comprises a relay KA1 contact and a jump position lamp LD, and the relay KA1 contact is connected in series with the jump position lamp LD;

[0018] The opening circuit includes a closing button SB1 contact, an opening button SB2 contact, a relay KA2 and a relay KA2 contact. The closing button SB1 contact, the opening button SB2 contact and the relay KA2 are connected in series, and the relay KA2 contact is connected in parallel with the opening button SB2 contact.

[0019] The after-closing indication circuit comprises a relay KA2 contact and a after-closing lamp HHD, and the relay KA2 contact and the after-closing lamp HHD are connected in series;

[0020] The protection trip circuit includes a protection trip opening contact and a relay KA3, and the protection trip opening contact and the relay KA3 are connected in series;

[0021] The steal jump holding circuit includes a KA1 contact, a KA2 contact, a KA3 contact, a relay KA4 and a relay KA4 contact, wherein the KA1 contact, the KA2 contact, the KA3 contact and the relay KA4 are connected in series, and the relay KA4 contact is connected in parallel with the KA3 contact;

[0022] The said tripping indication circuit comprises KA1 contact, KA2 contact, KA4 contact and tripping indicator TTD, and the KA1 contact, KA2 contact, KA4 contact and tripping indicator TTD are connected in series;

[0023] The jump output circuit and the closed output circuit are connected in parallel with other circuits;

[0024] The jump output circuit includes a KA1 contact and a relay KM1, and the KA1 contact and the relay KM1 are connected in series;

[0025] The post-closing output circuit includes a KA2 contact and a relay KM2, and the KA2 contact and the relay KM2 are connected in series.

[0026] Preferably, the portable power supply is a rechargeable DC 24V lithium battery, which provides power to all circuits, is compact and easy to carry, does not require an external power supply, and utilizes a rechargeable DC 24V lithium battery instead of an AC 220V and rectification link, thus avoiding safety issues and difficulty in obtaining power.

[0027] Preferably, the relay KA1, relay KA2, relay KA3 and relay KA4 all use power relays instead of winding resistors and electromagnetic current relays, simulate the opening and closing of the circuit breaker by the action of the power relays, and realize the circuit breaker position indication and self-holding function through their contacts. They have a modular design, a small size and convenient wiring.

[0028] Preferably, the relay KM1 and the relay KM2 are both solid-state relays, which can achieve isolation between the control end and the load end, and can directly drive a large current load with a tiny control signal; they have the switching characteristics of semiconductors such as switching transistors and bidirectional controllable, and can connect and disconnect the circuit without sparks. They have higher reliability, longer life, faster speed, and less interference from the outside world.

[0029] The present invention also provides a method for simulating a circuit breaker specifically for standby automatic switching debugging, including simulating manual closing and simulating manual opening;

[0030] The simulated manual closing comprises the following steps:

[0031] (1) Power on the device, all circuit breakers are in the tripped state and there is no manual opening, protection tripping and protection closing. At this time, all circuits are operating normally. The indicator lights are the tripped position light LD, the closed position light HHD and the stolen tripping light TTD on, and the closed position light HD off;

[0032] (2) When the closing button SB1 is pressed to simulate manual closing, the relay KA1 is activated, the KA1 contacts are activated, and the other contacts are not activated. The indicator lights are: the closed position light HD and the closed after light HHD are on, and the tripped position light LD and the stolen tripped light TTD are off.

[0033] The simulated manual opening comprises the following steps:

[0034] (1) Power on the device, all circuit breakers are in the tripped state and there is no manual opening, protection tripping and protection closing. At this time, all circuits are operating normally. The indicator lights are the tripped position light LD, the closed position light HHD and the stolen tripping light TTD on, and the closed position light HD off;

[0035] (2) When the opening button SB2 is pressed to simulate manual opening, the relay KA2 is actuated, the KA2 contacts are actuated, and the other contacts are not actuated. The indicator lights are: the trip light LD is on, the closed light HD, the after-close light HHD and the trip light TTD are off.

[0036] It also includes simulating protection tripping, including the following steps:

[0037] When the protection trip contact is opened to simulate protection trip after simulating manual closing, the relay KA3 is actuated and the KA3 contact is actuated, causing the KA1 relay to stop and the KA1 contact to recover. The indicator lights are: the tripping light LD and the closing light HHD are on, and the closing light HD and the stolen tripping light TTD are off.

[0038] It also includes simulating protection closing, including the following steps:

[0039] When the protection closing contact is opened to simulate protection closing after simulating manual opening, relay KA1 is actuated, KA1 contact is actuated, and the indicator light HD is on, while the tripping light LD, the post-closing light HHD and the stolen tripping light TTD are off.

[0040] The beneficial effects of the present invention are:

[0041] 1. High work efficiency: By adding the closing and tripping conditions, the various states of the circuit breaker can be clearly and intuitively reflected, which is more conducive to the logical judgment of the debugging personnel and greatly improves the work efficiency.

[0042] 2. High safety performance: Rechargeable DC 24V lithium battery is used to replace AC 220V and rectification link, and safe 24V voltage is used to greatly improve safety. At the same time, the built-in battery solves the problem of difficulty in obtaining electricity.

[0043] 3. High convenience: The device is modular and centralized, small in size, light in weight, easy to carry, and easy to replace components and maintain.

[0044] 4. High reliability: The device uses solid-state relays instead of DC contactors, which perfectly solves the DC arcing problem and realizes the isolation of the control end and the load end. It can use a tiny control signal to directly drive a large current load; it has the switching characteristics of switching transistors, bidirectional controllable and other semiconductors, can connect and disconnect the circuit without sparks, and the device operates stably; power relays and their contacts are used instead of winding resistors and electromagnetic current relays, and the opening and closing of the circuit breaker are simulated by the action of the power relay, and the circuit breaker position indication and self-holding function are realized through its contacts. Solid-state relays are used for high reliability.

[0045] 5. Wide applicability: It can be applied to various scenarios, and the standby automatic switching logic debugging can be carried out without power outage of primary equipment. Due to its small size and small space occupation, it solves the problem of conventional analog circuit breakers being limited in narrow working scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a circuit schematic diagram of the present invention with a stealing jump device;

[0047] In the figure: SB1 is the closing button; SB2 is the opening button; KA1 is the power relay and its contacts; KA2 is the power relay and its contacts; KA3 is the power relay and its contacts; KA4 is the power relay and its contacts; HD is the closing position light; LD is the tripping position light; HHD is the closing light; TTD is the stealing tripping light; KM1 is the solid-state relay; KM2 is the solid-state relay. The protection closing and protection tripping are both external input signals. DETAILED DESCRIPTION

[0048] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0049] Example 1

[0050] like Figure 1 As shown, the present invention is a simulated circuit breaker specially used for standby automatic switching debugging, including a portable power supply, a closing circuit, a closing position indication circuit, a tripping position indication circuit, an opening circuit, a closing indication circuit, a protection tripping circuit, a sneak tripping holding circuit and a sneak tripping indication circuit, and is provided with a closing indication to facilitate standby automatic switching logic debugging;

[0051] The closing circuit, the closing position indication circuit, the tripping position indication circuit, the opening circuit, the closing indication circuit, the protection closing circuit, the sneak trip holding circuit and the sneak trip indication circuit are sequentially connected in parallel to form a parallel circuit;

[0052] The closing circuit includes a closing button SB1 contact, an opening button SB2 contact, a protection closing input contact, a relay KA1, a relay KA1 contact and a relay KA3 contact. The closing button SB1 contact, the opening button SB2 contact, the relay KA1 and the relay KA3 contact are connected in series, the protection closing input contact is connected in parallel with the closing button SB1 contact and the opening button SB2 contact, and the relay KA1 contact is connected in parallel with the closing button SB1 contact.

[0053] The closing position indicating circuit comprises a relay KA1 contact and a closing position lamp HD, and the relay KA1 contact is connected in series with the closing position lamp HD;

[0054] The jump position indication circuit comprises a relay KA1 contact and a jump position lamp LD, and the relay KA1 contact is connected in series with the jump position lamp LD;

[0055] The opening circuit includes a closing button SB1 contact, an opening button SB2 contact, a relay KA2 and a relay KA2 contact. The closing button SB1 contact, the opening button SB2 contact and the relay KA2 are connected in series, and the relay KA2 contact is connected in parallel with the opening button SB2 contact.

[0056] The after-closing indication circuit comprises a relay KA2 contact and a after-closing lamp HHD, and the relay KA2 contact and the after-closing lamp HHD are connected in series;

[0057] The protection trip circuit includes a protection trip opening contact and a relay KA3, and the protection trip opening contact and the relay KA3 are connected in series;

[0058] The steal jump holding circuit includes a KA1 contact, a KA2 contact, a KA3 contact, a relay KA4 and a relay KA4 contact, wherein the KA1 contact, the KA2 contact, the KA3 contact and the relay KA4 are connected in series, and the relay KA4 contact is connected in parallel with the KA3 contact;

[0059] The terminal stealing indication circuit comprises a KA1 contact, a KA2 contact, a KA4 contact and a terminal stealing lamp TTD, and the KA1 contact, KA2 contact, KA4 contact and the terminal stealing lamp TTD are connected in series.

[0060] It also includes a jump output circuit and a post-closing output circuit;

[0061] The jump output circuit and the closed output circuit are connected in parallel with other circuits;

[0062] The jump output circuit includes a KA1 contact and a solid-state relay KM1, and the KA1 contact and the solid-state relay KM1 are connected in series;

[0063] The post-closing output circuit includes a KA2 contact and a solid-state relay KM2, and the KA2 contact and the solid-state relay KM2 are connected in series;

[0064] The portable power supply is a rechargeable DC 24V lithium battery, which provides power to all circuits. The portable power supply is small and easy to carry, does not require an external power supply, and uses a rechargeable DC 24V lithium battery to replace the AC 220V and rectification links, avoiding safety issues and difficulties in obtaining power.

[0065] The relays KA1, KA2, KA3 and KA4 all use power relays instead of winding resistors and electromagnetic current relays. The opening and closing of the circuit breaker is simulated by the action of the power relays, and the circuit breaker position indication and self-holding functions are realized through their contacts. They have a modular design, a small size and are easy to connect.

[0066] The relay KM1 and the relay KM2 are both solid-state relays, which can achieve isolation between the control end and the load end, and can directly drive a large current load with a tiny control signal; they have the switching characteristics of semiconductors such as switching transistors and bidirectional controllable, and can connect and disconnect the circuit without sparks. They are more reliable, have a long life, are fast, and are less susceptible to external interference.

[0067] This embodiment 1 also includes a method for simulating a circuit breaker specifically for standby automatic commissioning, including simulating manual closing and simulating manual opening;

[0068] The simulated manual closing comprises the following steps:

[0069] (1) Power on the device, all circuit breakers are in the tripped state and there is no manual opening, protection tripping and protection closing. At this time, all circuits are operating normally. The indicator lights are the tripped position light LD, the closed position light HHD and the stolen tripping light TTD on, and the closed position light HD off;

[0070] (2) When the closing button SB1 is pressed to simulate manual closing, the relay KA1 is activated, the KA1 contact is activated, and the other contacts are not activated. The closing circuit is connected, the closing position indication circuit is connected, the tripping position indication circuit is disconnected, the opening circuit is disconnected, the after-closing indication circuit is connected, the protection tripping circuit is disconnected, the sneak tripping holding circuit is disconnected, the sneak tripping indication circuit is disconnected, the tripping position output circuit is disconnected, and the after-closing output circuit is connected. The indicator lights are: the closing position light HD and the after-closing light HHD are on, and the tripping position light LD and the sneak tripping light TTD are off.

[0071] The simulated manual opening comprises the following steps:

[0072] (1) Power on the device, all circuit breakers are in the tripped state and there is no manual opening, protection tripping and protection closing. At this time, all circuits are operating normally. The indicator lights are the tripped position light LD, the closed position light HHD and the stolen tripping light TTD on, and the closed position light HD off;

[0073] (2) When the opening button SB2 is pressed to simulate manual opening, the relay KA2 operates, the KA2 contact operates, and the other contacts do not operate. The opening circuit is connected, the closing circuit is disconnected, the closed position indication circuit is disconnected, the trip position indication circuit is connected, and the closed indication circuit is disconnected, the protection trip circuit is disconnected, the sneak trip holding circuit is disconnected, the sneak trip indication circuit is disconnected, the trip position output circuit is connected, and the closed output circuit is disconnected. The indicator light is that the trip position light LD is on, and the closed position light HD, the closed light HHD and the sneak trip light TTD are off.

[0074] It also includes simulating protection tripping, including the following steps:

[0075] After simulating manual closing, when the protection tripping contact is opened to simulate protection tripping, relay KA3 operates, KA3 contact operates, the protection tripping circuit is connected, and the closing circuit is disconnected, causing KA1 relay to stop, KA1 contact to recover, closing position indication circuit is disconnected, tripping position indication circuit is connected, opening circuit is disconnected, closing indication circuit is connected, stealing tripping holding circuit is connected, stealing tripping indication circuit is disconnected, tripping position output circuit is connected, closing position output circuit is connected, and indicator light status is that the tripping position light LD and closing position light HHD are on, and the closing position light HD and stealing tripping light TTD are off;

[0076] It also includes simulating protection closing, including the following steps:

[0077] When the protection closing contact is opened to simulate protection closing after simulating manual opening, the closing circuit is connected, relay KA1 is actuated, KA1 contact is actuated, the closing position indication circuit is connected, the tripping position indication circuit is disconnected, the opening circuit is connected, the closing indication circuit is disconnected, the protection tripping circuit is disconnected, the sneak tripping holding circuit is disconnected, the sneak tripping indication circuit is disconnected, the tripping position output circuit is disconnected, and the closing position output circuit is disconnected. The indicator lights are as follows: the closing position light HD is on, the tripping position light LD, the closing position light HHD and the sneak tripping light TTD are off.

Claims

1. A simulated circuit breaker specially used for standby automatic commissioning, characterized in that: It includes a portable power supply, a closing circuit, a closing position indication circuit, a tripping position indication circuit, an opening circuit, a closing indication circuit, a protection tripping circuit, a sneak tripping holding circuit and a sneak tripping indication circuit; The closing circuit, the closing position indication circuit, the tripping position indication circuit, the opening circuit, the closing indication circuit, the protection closing circuit, the sneak trip holding circuit and the sneak trip indication circuit are sequentially connected in parallel to form a parallel circuit; The closing circuit includes a closing button SB1 contact, an opening button SB2 contact, a protection closing input contact, a relay KA1, a relay KA1 contact and a relay KA3 contact. The closing button SB1 contact, the opening button SB2 contact, the relay KA1 and the relay KA3 contact are connected in series, the protection closing input contact is connected in parallel with the closing button SB1 contact and the opening button SB2 contact, and the relay KA1 contact is connected in parallel with the closing button SB1 contact. The closing position indicating circuit comprises a relay KA1 contact and a closing position lamp HD, and the relay KA1 contact is connected in series with the closing position lamp HD; The jump position indication circuit comprises a relay KA1 contact and a jump position lamp LD, and the relay KA1 contact is connected in series with the jump position lamp LD; The opening circuit includes a closing button SB1 contact, an opening button SB2 contact, a relay KA2 and a relay KA2 contact. The closing button SB1 contact, the opening button SB2 contact and the relay KA2 are connected in series, and the relay KA2 contact is connected in parallel with the opening button SB2 contact. The after-closing indication circuit comprises a relay KA2 contact and a after-closing lamp HHD, and the relay KA2 contact and the after-closing lamp HHD are connected in series; The protection trip circuit includes a protection trip opening contact and a relay KA3, and the protection trip opening contact and the relay KA3 are connected in series; The steal jump holding circuit includes a KA1 contact, a KA2 contact, a KA3 contact, a relay KA4 and a relay KA4 contact, wherein the KA1 contact, the KA2 contact, the KA3 contact and the relay KA4 are connected in series, and the relay KA4 contact is connected in parallel with the KA3 contact; The terminal stealing indication circuit comprises a KA1 contact, a KA2 contact, a KA4 contact and a terminal stealing lamp TTD, and the KA1 contact, KA2 contact, KA4 contact and the terminal stealing lamp TTD are connected in series.

2. According to claim 1, a simulated circuit breaker specially used for standby automatic commissioning, characterized in that: It also includes a jump output circuit and a post-closing output circuit; The jump output circuit and the closed output circuit are connected in parallel with other circuits; The jump output circuit includes a KA1 contact and a relay KM1, and the KA1 contact and the relay KM1 are connected in series; The post-closing output circuit includes a KA2 contact and a relay KM2, and the KA2 contact and the relay KM2 are connected in series.

3. According to claim 1, a simulated circuit breaker specially used for standby automatic commissioning, characterized in that: The portable power source is a rechargeable DC 24V lithium battery, and the portable power source provides power to all circuits.

4. According to claim 1, a simulated circuit breaker specially used for standby automatic commissioning, characterized in that: The relay KA1, the relay KA2, the relay KA3 and the relay KA4 all use power relays to realize the circuit breaker position indication and self-holding functions.

5. According to claim 2, a simulated circuit breaker specially used for standby automatic commissioning, characterized in that: The relay KM1 and the relay KM2 both use solid-state relays to isolate the control end from the load end, and a small control signal drives a large current load.

6. A method for simulating a circuit breaker specifically for standby automatic commissioning, characterized in that: Including simulated manual closing and simulated manual opening; The simulated manual closing comprises the following steps: (1) Power on the device, all circuit breakers are in the tripped state and there is no manual opening, protection tripping and protection closing. At this time, all circuits are operating normally. The indicator lights are the tripped position light LD, the closed position light HHD and the stolen tripping light TTD on, and the closed position light HD off; (2) When the closing button SB1 is pressed to simulate manual closing, the relay KA1 is activated, the KA1 contacts are activated, and the other contacts are not activated. The indicator lights are: the closed position light HD and the closed after light HHD are on, and the tripped position light LD and the stolen tripped light TTD are off.

7. A method for simulating a circuit breaker specially used for standby automatic commissioning according to claim 4, characterized in that: The simulated manual opening comprises the following steps: (1) Power on the device, all circuit breakers are in the tripped state and there is no manual opening, protection tripping and protection closing. At this time, all circuits are operating normally. The indicator lights are the tripped position light LD, the closed position light HHD and the stolen tripping light TTD on, and the closed position light HD off; (2) When the opening button SB2 is pressed to simulate manual opening, the relay KA2 is actuated, the KA2 contacts are actuated, and the other contacts are not actuated. The indicator lights are: the trip light LD is on, the closed light HD, the after-close light HHD and the trip light TTD are off.

8. A method for simulating a circuit breaker specially used for standby automatic commissioning according to claim 4, characterized in that: It also includes simulating protection tripping, including the following steps: When the protection tripping contact is opened to simulate protection tripping after simulating manual closing, relay KA3 is actuated and KA3 contact is actuated, causing KA1 relay to stop and KA1 contact to recover. The indicator lights are: the tripping light LD and the closed light HHD are on, and the closed light HD and the stolen tripping light TTD are off.

9. A method for simulating a circuit breaker specially used for standby automatic commissioning according to claim 5, characterized in that: It also includes simulating protection closing, including the following steps: When the protection closing contact is opened to simulate protection closing after simulating manual opening, relay KA1 is actuated, KA1 contact is actuated, and the indicator light HD is on, while the tripping light LD, the post-closing light HHD and the stolen tripping light TTD are off.

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