CN104764998B - For replacing the simulator of circuit breaker of true primary cut-out in protection test - Google Patents

Abstract

The invention discloses a circuit breaker simulation device for replacing a real high-voltage circuit breaker in a protection test, including a circuit breaker circuit. The circuit breaker circuit includes a plurality of extended relay circuits with the same circuit structure. , the circuit breaker protection closing input is connected to the closing coil and the controller closing input circuit, the closing coil is connected in parallel with the controller closing input circuit, and the circuit breaker protection tripping input is connected to the opening coil and the controller The opening and closing circuit of the opening and closing of the gate is connected in parallel with the opening and closing circuit of the controller. Each extended relay circuit adopts a relay as a contact expansion, which is used to simulate the auxiliary switch contact of the circuit breaker to open and close the position; The opening and closing time of the 6-way simulated circuit breaker of the present invention can be set as required, and the simulated opening and closing time of the circuit breaker has high precision.

Description

A circuit breaker simulation device used to replace real high-voltage circuit breakers in protection tests

technical field

The invention relates to a simulation device capable of simulating the state of a high-voltage circuit breaker, in particular to a circuit breaker simulation device capable of replacing a real high-voltage circuit breaker in protection tests.

Background technique

Due to the large number of test items in the current relay protection test, the circuit breaker needs to be opened and closed frequently, which will affect the service life of the circuit breaker. In the transformation and new construction of substations, when the protection device has been installed and the high-voltage circuit breaker is not installed due to supply and other reasons, it will affect the progress of the protection test and the progress of the entire project.

After the automatic switching device of the incoming line of the substation and the automatic switching device of the main transformer and the backup are put into operation, the protection test of automatic switching shall be carried out in the test period. Due to the delay of the switching of the standby automatic switching, a power outage of 3-5 seconds is required. Cause short-term power failure of the substation, affecting the normal power supply to users. For a long time, the standby automatic switching device has not been tested according to the normal test cycle. With the increase of the running time, the standby automatic switching device often refuses to operate and malfunctions. In order to solve the problem of uninterrupted power failure, the whole set of protection tests for the standby automatic switching device are carried out. In order to ensure normal power supply, for a long time, ordinary relays have been used to simulate real circuit breakers, and the whole set of tests for the standby automatic switching device without power failure have been carried out. The ordinary relay starts the coil The resistance is relatively large, usually 10-20K ohms, and it is fixed and cannot be adjusted. It is quite different from the resistance (70-600 ohms) of the opening and closing coil of the actual high-voltage circuit breaker. When the starting coil is connected to the opening and closing control circuit When the current of the control circuit is too small, the current bearing capacity of the contact point of the protection device cannot be tested, and the position display of the protection device will also be too small due to the current, and the correct acquisition of the switch position cannot be carried out; the action time of the ordinary relay is usually ≤20ms, the opening time of high-voltage circuit breakers is usually >20ms, and the closing time is usually >50ms, so ordinary relays cannot simulate the opening and closing time of high-voltage circuit breakers well, so as to optimize the time for protection at all levels The cooperation is correctly verified.

The existing circuit breaker simulation devices produced by a small number of manufacturers are not comprehensive enough in function, and have the following shortcomings:

1. The opening and closing time of the circuit breaker is fixed at several positions, the opening and closing of each circuit breaker cannot be set according to the demand, and the opening and closing resistance can be adjusted in less positions;

2. The existing power input adopts a single AC power input, and does not consider the situation that the AC power supply at the work site is not easy to obtain during work;

3. The capacity of the output node of the circuit breaker is small, the opening and closing time and the opening and closing resistance have large errors, and the price is expensive, and the practicability is not strong.

Contents of the invention

In order to solve the deficiencies in the prior art, the present invention discloses a circuit breaker simulation device used in the protection test to replace the real high-voltage circuit breaker. Influenced by the status quo, solve the problem that the protection device cannot be tested because the high-voltage circuit breaker is not installed, solve the problem that the whole group of protection tests for the substation equipment automatic switching device cannot be guaranteed without power failure, and solve the problem of the existing circuit breaker simulation device The functions are not comprehensive enough, and the simulation effect is not good enough.

To achieve the above object, the specific scheme of the present invention is as follows:

The circuit breaker simulation device used to replace the real high-voltage circuit breaker in the protection test, including the core controller, which is respectively connected with the circuit breaker circuit, the control power supply circuit, the human-computer interaction device, the opening and closing coil simulation device and the display panel connected;

The circuit breaker circuit includes a plurality of extended relay circuits with the same circuit structure, the circuit breaker protection closing circuit is connected to the closing coil and the controller closing circuit, and the closing coil and the controller closing circuit are connected in parallel , The circuit breaker protection tripping switch is connected to the opening coil and the controller opening and closing circuit, the opening coil is connected in parallel with the controller opening and closing circuit, and each extended relay circuit adopts a high-power relay as a contact expansion , used to simulate the auxiliary switch contact of the circuit breaker, and open the opening and closing position.

The core controller is used to realize the simulation of the inherent opening and closing time of various circuit breakers, and the control of the logical judgment of the opening and closing signals of the opening and closing signals; The programming controller can realize the simulation of 6 circuit breakers.

The control power supply circuit uses a switching power supply as the control power supply, and can provide adjustable DC output by using AC and DC two-way power input;

The human-computer interaction device adopts a text display as a human-computer interaction device, which is used to set the opening and closing time of the simulated actual circuit breaker, and monitor and alarm the opening and closing state of the circuit breaker in real time;

The opening and closing coil simulation device includes a group of opening coils that can be adjusted in steps and a group of closing coils that can be adjusted in steps;

The display panel is used to display the on-off position of each analog circuit breaker.

The extended relay circuit includes a relay, the normally closed contact of the relay is connected in series to the closing circuit of the circuit breaker, the normally open contact of the relay is connected in series to the opening circuit of the circuit breaker, and the trip terminal of the relay is connected to the trip circuit through the trip delay module. The closing end of the relay is connected to the closing circuit through the closing delay module.

The trip circuit includes a first diode and a second diode connected in reverse series, the negative terminal of the first diode is connected to the trip delay module, and the negative terminal of the first diode is connected to the trip delay module. The line between the first and second diodes is connected to the hand trip switch, the line between the first diode and the second diode is connected to the protection trip switch, and the second diode is also connected to a normally open contact of the extended relay The line between the second diode and the pair of normally open contacts of the extended relay is also connected with a voltage dividing resistor and an indicator light in series to reflect the opening state of the circuit breaker in real time.

The closing circuit includes a third diode and a fourth diode connected in reverse series, the negative terminal of the third diode is connected to the closing delay module, and the negative terminal of the third diode is connected to the closing delay module. The line between the time modules is connected to the hand switch, the line between the third diode and the fourth diode is connected to the protection closing switch, and the fourth diode is also connected to a normally closed switch of the extended relay. The contacts are connected, and the line between the fourth diode and a pair of normally closed contacts of the extended relay is also connected with a voltage dividing resistor and an indicator light in series to reflect the closing state of the circuit breaker in real time.

The control power supply circuit includes an AC220V AC input terminal and a DC power supply terminal connected from the substation DC system, the AC220V AC input terminal is connected to the DC220V output switching power supply, the AC220V AC input terminal is also provided with a switch, and the DC220V output terminal The switching power supply has an adjustable DC output of DC0-260V and 1.5-30A. The output end is equipped with a digital DC voltmeter. The working power of the digital voltmeter is taken from the incoming line side of the switching power supply. There is also a three-position switching switch between the terminal and the DC power output of the switching power supply.

The opening coil and the closing coil are respectively connected in series with four opening coils of the high-voltage circuit breaker of the CT10A mechanism, and are connected to a band switch to realize 5-speed adjustment.

The opening and closing circuits of the 6 circuit breakers are all connected in series with forward diodes to ensure that when each circuit breaker receives the closing command separately, that is, when the circuit breaker is opened and closed, it can ensure that the current is not allowed to pass through other circuit breakers. The opening and closing control loop causes malfunction.

Working principle: This device uses the programmable controller as the control core to realize the accurate simulation of the opening and closing time of the circuit breaker, the logic judgment and execution of the opening and closing commands, and the multi-level adjustable real circuit breaker. The opening and closing coils are used to simulate the resistance of the opening and closing circuit of the circuit breaker, and the auxiliary contacts of the high-power relay are used to replace the auxiliary contacts of the real circuit breaker to open the position. According to the needs of the protection test, each circuit can be simulated The circuit breaker can be manually set and closed, and the external protection trip and close switch can be connected to this device. The control core is logically judged and delayed by the delay module to realize the respective tripping of each analog circuit breaker. Close the switch and send the position of the circuit breaker to accurately simulate the action process and action state of the real circuit breaker.

The process of using this device instead of the real circuit breaker to test the line protection device is as follows: according to the simulated opening and closing time of the real circuit breaker, set the opening and closing time of each circuit breaker on the text display, Adjust the opening and closing resistance on the panel so that the opening and closing resistance of each circuit breaker is close to the opening and closing circuit resistance of the simulated real circuit breaker, and press the manual closing button on the panel to close the corresponding circuit breaker In the opening position, press the opening button to put the corresponding circuit breaker in the opening position. Connect the closing input of this device to the closing output of the protection device, connect the tripping input to the tripping output of the protection device, connect the closing output of this device to the position opening of the protection device, and connect the sub-position of this device The output is connected to the split switch input of the protection device. After simulating the action of the circuit breaker, the indicator light corresponding to the circuit breaker on the surface will light up, and the text display will also have an alarm indication corresponding to the opening and closing action of the circuit breaker, displaying "xx# circuit breaker Opening", "xx# circuit breaker closing", thus completing the entire test process of protection action, tripping and closing successfully, and verifying the protection device. This device can be used to test the whole group of backup and automatic switching devices, and can guarantee a non-stop power supply, and can also test the protection devices such as the main transformer differential protection and backup protection.

Beneficial effects of the present invention:

The opening and closing time of the 6-way analog circuit breaker of the present invention can be set according to needs, and the accuracy of the simulated circuit breaker opening and closing time is high; the opening and closing coil of the actual high-voltage circuit breaker is used as the opening and closing coil of the simulated circuit breaker to simulate The effect is real and effective, and the resistance precision of the loop is large; the working power supply adopts AC and DC dual power input, and has an adjustable DC power output; , the current can only pass through the coil; each analog circuit breaker can operate more than 100,000 times, and has a long service life; the structure is simple, the volume is small, and the cost is low.

The present invention can simulate a real circuit breaker, and replace the real circuit breaker to check the relay protection device, so as to reduce the service life of the circuit breaker due to frequent opening and closing of the circuit breaker in the protection test; In order to ensure that the two incoming lines of the substation are not powered off, a whole set of protection tests are carried out on the automatic input device for the incoming line of the substation; when the protection device has been installed but the circuit breaker is not installed when the substation is newly built or renovated, this device can also be used The test of the protection device can be carried out to shorten and advance the installation period; the device can also be used to supply the protection device with the DC power output of the device when the DC system of the substation is not in use, and the test can be carried out in advance.

The device described in the present invention is suitable for the electric power industry, protection equipment manufacturers, scientific research institutes, professional colleges, as the actual replacement equipment for relay protection and automatic device belt switch system transmission test. The action of this equipment is accurate and reliable. The number of actions is not limited, and it can simulate the real circuit breaker to the greatest extent, which can greatly improve the accuracy and integrity of the test.

Description of drawings

Fig. 1a is a schematic diagram of the PC66201 circuit breaker simulation device of the present invention;

Fig. 1 b is an enlarged view of each phase circuit in the PC66201 type circuit breaker of the present invention;

Fig. 2 is a figure for adjusting the opening and closing coil positions of the PC66201 circuit breaker simulation device of the present invention;

Fig. 3 is the circuit diagram of the control power supply of the PC66201 circuit breaker simulation device of the present invention;

Fig. 4 is the overall appearance diagram of the panel of the PC66201 circuit breaker simulation device of the present invention;

Fig. 5 is a schematic diagram of the internal structure of the PC66201 circuit breaker simulation device of the present invention;

In the figure, 1. Digital DC voltmeter, 2. 220V output switching power supply, 3. AC input, 4. Adjustable voltage DC output, 5. DC input, 6. 24V output switching power supply, 7. Text display, 8. One expansion relay circuit, 9, the second expansion relay circuit, 10, the third expansion relay circuit, 11, the fourth expansion relay circuit, 12, the fifth expansion relay circuit, 13, the sixth expansion relay circuit.

detailed description:

The present invention is described in detail below in conjunction with accompanying drawing:

The circuit breaker simulation device of the present invention is composed of a control core part, an extended relay part, an opening and closing coil simulation part, a control power supply part, a man-machine interaction part, an operation and a display panel.

The control core part, the E part shown in Figure 5, is a programmable controller with 12 inputs and 6 outputs. The simulation of opening and closing time, the function of logical judgment control of opening and closing signals.

The corresponding input and output of the programmable controller are:

I1: #1 circuit breaker closing command input, I2: #1 circuit breaker opening command input

I3: #2 circuit breaker closing command input, I4: #2 circuit breaker opening command input

I5: #3 circuit breaker closing command input, I6: #3 circuit breaker opening command input

I7: #4 circuit breaker closing command input, I8: #4 circuit breaker opening command input

I9: #5 circuit breaker closing command input, I10: #5 circuit breaker opening command input

I11: #6 circuit breaker closing command input, I12: #6 circuit breaker opening command input

The corresponding output contacts are:

(Paired contacts, contact open for opening, contact closed for closing)

Q1: #1 circuit breaker opens and closes

Q2: #1 circuit breaker opens and closes

Q3: Opening and closing of #1 circuit breaker

Q4: Opening and closing of #1 circuit breaker

Q5: Opening and closing of #1 circuit breaker

Q6: Opening and closing of #1 circuit breaker

Use the programmable controller programming software to write the logic function diagram program and download it to the programmable controller.

The input logic module in the function diagram is a non-logic module, and the delay function module is a hold-on delay module, which is directly output from the RS relay module to the output relay. Programmable controller is a mature industrial control equipment with high reliability, strong anti-interference ability and long service life.

The specific working principle is described as follows:

The logic module shown in the logic function diagram of this programmable controller is selected as a non-logic module, and the function module is selected as a delay connection module and an RS circuit breaker module. The tripping and closing command is connected by the I-break, and enters the analysis and judgment of the logic function module. The purpose of connecting the tripping and closing command with the inverter is to effectively control the state when the test bench is powered on for the first time and prevent the analog circuit breaker from appearing. Random state, by delaying the connection of the intermediate relay to prevent jitter, ensuring reliable signals can trigger the flipping of the RS two-position relay, effectively isolating the instantaneous interference signal, the RS two-position relay simulates a real circuit breaker, and the outlet sends power components to ensure the actual power of the tripping and closing circuit And impedance, output by O1-O8 port pairs.

The extended relay part is the D1-D6 part in Figure 5, corresponding to the 6-way circuit breaker. As shown in Figure 1a-1b, each simulated circuit breaker uses a high-power DC relay as a contact extension to simulate the auxiliary switch contacts of the high-voltage circuit breaker for opening and closing positions. DC relay model: JQX-38F, output contacts: three open and three closed, contact capacity 40A/28VDC 40A/240VAC, coil voltage: DC220V, coil power: 2.5W. Each analog circuit breaker is provided by the relay with a pair of normally open contacts to open, the analog switch is set, and a pair of normally closed contacts is opened to simulate close. Each analog circuit breaker opening circuit is connected in series with a pair of normally open contacts of this extended relay, and each circuit breaker closing circuit is connected in series with a pair of normally closed contacts of this extended relay, so as to cut off the opening and closing after opening and closing The coil circuit and the relay contact capacity are large enough to effectively cut off the DC arc generated by opening and closing, ensuring that the coil will not be burned by current for a long time. The electrical life of this relay is 100,000 times and the mechanical life is 10 million times. The contact action time is fast, within 5ms.

As shown in Figure 1a, the extended relay includes: a first extended relay circuit 8, corresponding to 1-way circuit breaker, 1-way circuit breaker phase A, a second extended relay circuit 9, corresponding to 2-way circuit breaker, 1-way circuit breaker phase B, The third extended relay circuit 10 corresponds to 3-way circuit breaker, 1-way circuit breaker phase C, the fourth extended relay circuit 11 corresponds to 4-way circuit breaker, 2-way circuit breaker phase A, and the fifth extended relay circuit 12 corresponds to 5-way Circuit breaker, 2-way circuit breaker phase B, sixth expansion relay circuit 13, corresponding to 6-way circuit breaker, 2-way circuit breaker phase C.

The opening and closing coil simulation part is part A1-A8 in Fig. 5, A1, A3, A5, A7 are connected in series to form a closing coil, and A2, A4, A6, A8 are connected in series to form a closing coil. The opening and closing circuits are respectively connected in series with 4 opening coils of the high-voltage circuit breaker of the CT10A mechanism, and are connected to the band switch to realize 5-speed adjustment, and each coil is 125Ω. E is programmable controller, H1-H2 simple integrated circuit board, D1-D6 extended relay, C terminal.

The closing coil resistance is:

Level 1: A1＝125Ω

Level 2: A1+A3＝250Ω

Level 3: A1+A3+A5＝275Ω

4 gears: A1+A3+A5+A7＝500Ω

5th gear: ∞Ω.

The opening coil resistance is:

Level 1: A2＝125Ω

Level 2: A2+A4＝250Ω

Level 3: A2+A4+A6＝275Ω

4 gears: A2+A4+A6+A8＝500Ω

5 gears: ∞Ω

The purpose of introducing 5 gears (∞Ω) is to cooperate with the protection device and simulate the protection test of the disconnection of the control circuit. During the protection test, adjust the gear to a gear close to the resistance of the simulated high-voltage circuit breaker opening and closing coil, so as to test the current bearing capacity of the tripping and closing contacts of the protection device. In order to avoid mutual inductance of the coils, the position of the coils is arranged so that there is a distance of 3cm between each two coils, and the two opening coils are connected in series after a closing coil is separated, and they are kept away from the programmable controller and other components to avoid electromagnetic interference. interference. As shown in Figure 2, the 6-way analog circuit breaker shares a set of adjustable opening coils and a set of adjustable closing coils. The opening and closing coil loops of each circuit breaker are connected in series with diodes, and the unidirectional conductivity of the diodes is used to avoid causing damage to other circuits when an external closing command is input.

close. When the hand is opened and closed, no current will pass through the opening and closing coil, and only when the external tripping and closing is opened, the current will pass through the coil.

The control power supply part is the control power supply circuit part as shown in Figure 3, including the 220V output switching power supply 2, the input terminal of the 220V output switching power supply 2 is connected to the AC input 3, and there is also a connection between the AC input and the 220V output switching power supply 2 Switch, a digital DC voltmeter 1 is also connected between the input terminal of the 220V output switching power supply 2 and the adjustable voltage DC output terminal 4, and the output terminal of the 220V output switching power supply 2 is also connected to the DC input terminal 5 through a three-position switch. The other end of the three-position switch is connected to the text display 7 through the 24V output switching power supply 6 .

The control power circuit part adopts AC220V AC input DC0-260V 2.2A 500W adjustable switching power supply as the device control power supply, working power supply and signal loop power supply. When the AC power supply is inconvenient, it can also be connected from the DC system of the substation (+110V, -110V) DC power supply, the operation panel is equipped with a three-position switching switch, which is convenient for switching, and avoids mixing the DC power converted by the switching power supply with the DC power of the DC system of the substation, which will affect the DC system of the entire substation. The 500W switching power supply can provide 0-260V, 1.5-30A adjustable DC output, so that when the substation is newly built or renovated, when the DC system has not been completed, it can provide DC power for preliminary testing of the protection device. The control power supply voltage and adjustable DC output voltage are monitored and displayed by a digital DC voltmeter. ICL7135 digital voltmeter is used, panel type, digital display, displaying four and a half digits, high precision, and beautiful appearance.

The layout of the internal power supply module of the instrument is shown in the B, G, and F parts of Figure 5. B is a 500W 0-220V adjustable DC output switching power supply, G is a 24V switching power supply, F is a 5V switching power supply, and the 24V switching power supply is designed for text displays. Provide working power, 5V switching power supply is designed to provide working power for ICL7135 digital voltmeter.

The human-computer interaction part refers to the use of a panel-type embedded text display as an interactive tool with the experimenter and the controller. The programmable control can be modified on the text display according to the actual opening and closing time of the circuit breaker on the simulated site. The opening and closing time of the analog circuit breaker can be changed by the value of the time register inside the circuit breaker. The opening and closing time of each analog circuit breaker can be changed on the panel, which is convenient and quick to operate. The text display can also monitor and alarm the opening and closing status of each circuit breaker in real time. Each circuit breaker is equipped with an external protection switch to trip and close, and can be opened and closed manually.

The operation and display panel part refers to the part shown in Figure 4. The operation panel is divided into 7 areas, namely the analog circuit breaker position output area, the opening and closing command input area, and the manual opening and closing operation is the indicator light display area. Adjustable voltage monitoring and output area, opening and closing circuit resistance adjustment area, AC and DC power input and operation switching area, text display area, each area is divided reasonably, convenient for wiring and operation, and the overall layout is beautiful. All banana sockets on the panel are distinguished according to the technical standards of A, yellow, B, green, C, red, and DC power supply according to the technical standards of red + and blue -. The panel-type LED indicator light is used as the monitoring indicator, red and green. The panel-type manual opening and closing operation button is used for manual opening and closing operations, and red closing and green opening. The operation panel is made of two-color plastic acrylic board, and laser engraving is used to open holes and engrave characters. The bottom of the panel is closely attached to an insulating board for strength support.

The control core part, extended relay part, control power supply part, human-computer interaction part, opening and closing coil simulation part, operation and display panel are assembled and placed in a 42cm long 32cm wide 20.5cm high instrument box to form a Complete PC66201 circuit breaker simulation device, the weight of the instrument is 8.8 kg, and the overall is light and beautiful.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than limit them. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent replacements to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all of them should be included in the scope of the present invention. within the scope of the claims.

Claims (6)

1. The circuit breaker simulation device used to replace the real high-voltage circuit breaker in the protection test is characterized in that it includes a core controller, and the core controller is respectively connected with the circuit breaker circuit, the control power supply circuit, the human-computer interaction device, the opening and closing The coil simulation device is connected to the display panel; The circuit breaker circuit includes a plurality of extended relay circuits connected in parallel with the same circuit structure, one end of the circuit breaker circuit is connected to the closing coil, and the other end is connected to the opening coil, and each extended relay circuit uses a relay as a contact extension , used to simulate the auxiliary switch contact of the circuit breaker, and open the opening and closing position; The extended relay circuit includes a relay, the normally closed contact of the relay is connected in series to the closing circuit of the circuit breaker, the normally open contact of the relay is connected in series to the opening circuit of the circuit breaker, and the trip terminal of the relay is connected to the trip circuit through the trip delay module. The closing end of the relay is connected to the closing circuit through the closing delay module; The trip circuit includes a first diode and a second diode connected in reverse series, the negative terminal of the first diode is connected to the trip delay module, and the negative terminal of the first diode is connected to the trip delay module. The line between the first diode and the second diode is connected to the trip switch, the line between the first diode and the second diode is connected to the protection trip switch, and the second diode is also connected to a normally open contact of the extended relay. The line between the two diodes and the pair of normally open contacts of the extended relay is also connected with a series voltage dividing resistor and an indicator light; The closing circuit includes a third diode and a fourth diode connected in reverse series, the negative terminal of the third diode is connected to the closing delay module, and the negative terminal of the third diode is connected to the closing delay module. The line between the time modules is connected to the hand switch, the line between the third diode and the fourth diode is connected to the protective closing switch, and the fourth diode is also connected to a normally closed contact of the extended relay. The line between the fourth diode and a pair of normally closed contacts of the extended relay is also connected with a series voltage dividing resistor and an indicator light. 2. The circuit breaker simulation device for replacing real high-voltage circuit breakers in protection tests as claimed in claim 1, wherein the control power supply circuit adopts a switching power supply as a control power supply, and utilizes AC and DC two-way power input, which can Provide adjustable DC output; The human-computer interaction device adopts a text display as a human-computer interaction device, which is used to set the opening and closing time of the simulated actual circuit breaker, and monitor and alarm the opening and closing state of the circuit breaker in real time; The opening and closing coil simulation device includes a set of adjustable opening coils and a set of adjustable closing coils; The display panel is used to display the on-off position of each analog circuit breaker. 3. The circuit breaker simulation device for replacing real high-voltage circuit breakers in protection tests as claimed in claim 1, wherein the core controller is used to realize the simulation of the inherent opening and closing times of various circuit breakers, Controlling the logic judgment of opening and closing signals; the control core adopts programmable controllers with 12 inputs and 6 outputs, which can realize the simulation of 6 circuit breakers. 4. The circuit breaker simulator for replacing real high-voltage circuit breakers in protection tests as claimed in claim 1, wherein said control power supply circuit includes an AC220V AC input terminal and a DC power supply terminal connected from a substation DC system , the AC220V AC input terminal is connected to the DC220V output switching power supply, the AC220V AC input terminal is also provided with a switch, the DC220V output switching power supply has an adjustable DC output of DC0-260V, 1.5-30A, and the output terminal is equipped with a digital DC voltmeter, the working power supply of the digital voltmeter is taken from the incoming line side of the switching power supply, and a three-position switching switch is also set between the DC power terminal connected to the DC system of the substation and the DC power output of the switching power supply. 5. The circuit breaker simulation device for replacing real high-voltage circuit breakers in protection tests as claimed in claim 1, wherein the opening coil and the closing coil are respectively connected in series with four high-voltage circuit breakers of CT10A mechanism The opening coil is connected to the band switch to realize 5-speed adjustment. 6. The circuit breaker simulation device for replacing real high-voltage circuit breakers in protection tests according to claim 3, characterized in that, the opening and closing circuits of the six circuit breakers are all connected in series with forward diodes.