A circuit breaker mechanism cabinet for a substation secondary training system

Abstract

The application relates to the technical field of circuit breakers, in particular to a circuit breaker mechanism box for a substation secondary training system, which comprises a man-machine interface controller, an operation mode switching knob, an opening button, a closing button, a lighting switch and virtual element wiring ends arranged on the circuit breaker mechanism box; the man-machine interface controller is used for controlling virtual elements in an energy storage loop and a control loop through the virtual element wiring ends, so as to simulate the energy storage state, the SF6 pressure state and the action state of an energy storage motor, a closing coil and an opening coil of a real circuit breaker. The programmable man-machine interface controller is used for realizing the secondary loop function of the circuit breaker mechanism box, replacing the actual circuit breaker and being applied to the substation secondary training system, and meanwhile, the abnormal fault of the circuit breaker can be flexibly set through a fault setting interface and an expansion switch, so that the circuit breaker has the effects of simple control principle, high flexibility, wide applicability and low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breaker, in particular to a circuit breaker mechanism box for substation secondary training system. BACKGROUND

[0002] With the rapid development of smart grid technology, the demand for personnel who can independently complete the overall debugging, acceptance, fault troubleshooting and other work of conventional stations and smart stations is growing, but there is a serious shortage of maintenance personnel who can independently complete the overall debugging, acceptance, fault troubleshooting and other work of conventional stations and smart stations in the power system, which poses a hidden danger to the safe and stable operation of the power grid. If the training of debugging, acceptance, fault troubleshooting and other operation and maintenance skills is to be realized as a whole, a real circuit breaker mechanism box consisting of primary equipment training field and secondary equipment needs to be built.

[0003] However, since the current circuit breaker mechanism box cannot be used separately from the circuit breaker body, or needs to be equipped with an energy absorption device, or needs to be redesigned with a special mechanism box, the construction of a real circuit breaker mechanism box secondary wiring consisting of a primary equipment training field and a secondary equipment will bring problems such as large floor area, high investment cost, and complicated repeated setting of equipment abnormal faults. SUMMARY

[0004] The present application provides a circuit breaker mechanism box for substation secondary training system, which solves the technical problem that the traditional real circuit breaker mechanism box secondary wiring has problems such as large floor area, high investment cost, and complicated repeated setting of equipment abnormal faults.

[0005] To solve the above technical problems, the present application provides a circuit breaker mechanism box for substation secondary training system, comprising: a human-machine interface controller, an operating mode switching knob, an opening button, a closing button, a lighting switch and a virtual component wiring end arranged on the circuit breaker mechanism box; wherein the virtual component wiring end is provided with simulated opening coil wiring end, closing coil wiring end, energy storage motor wiring end, auxiliary switch relay output contact point, energy storage auxiliary switch relay output contact point, energy storage travel switch relay output contact point and density control relay output contact point.

[0006] The human-machine interface controller is electrically connected with the energy storage circuit, the control circuit and the passive signal output wiring, and the human-machine interface controller is used to control the virtual components in the energy storage circuit and the control circuit through the virtual component wiring end, so as to simulate the energy storage state, the sulfur hexafluoride circuit breaker gas pressure state and the action state of the energy storage motor, the closing coil and the opening coil of the real circuit breaker.

[0007] In further embodiments, the energy storage circuit includes an energy storage control power supply, an energy storage power switch, an energy storage mechanism signal lamp, a motor energy storage circuit connected with an energy storage motor relay coil, and an energy storage control circuit connected with the energy storage stroke switch relay output contact; wherein the energy storage mechanism signal lamp includes an energy storage mechanism not storing energy or storing energy signal lamp and an energy storage mechanism has stored energy signal lamp;

[0008] The motor energy storage circuit is provided with two contactor normally open contacts and an energy storage motor relay coil arranged between the two contactor normally open contacts, and the two ends of the motor energy storage circuit are connected with the positive and negative poles of the energy storage control power supply through the energy storage power switch; wherein the contactor is used to control the operation of the energy storage motor;

[0009] The energy storage control circuit is provided with a normally closed contact of an energy storage stroke switch relay and a contactor coil connected in series, and the energy storage mechanism not storing energy or storing energy signal lamp is connected in parallel across the contactor coil; wherein the normally closed contact of the energy storage stroke switch relay is used to control the state of the energy storage mechanism not storing energy or storing energy signal lamp and the attraction and release of the contactor;

[0010] The energy storage mechanism has stored energy signal lamp is connected with the normally open contact of the energy storage stroke switch relay in series, and the normally open contact of the energy storage stroke switch relay is connected with the positive and negative poles of the energy storage control power supply; wherein the normally open contact of the energy storage stroke switch relay is used to control the state of the energy storage mechanism has stored energy signal lamp.

[0011] In further embodiments, the density control relay output contact includes a gas pressure alarm output contact and a gas pressure locking output contact, and the control circuit includes a control power supply, a low gas pressure alarm control circuit, a low gas pressure locking control circuit, a closing circuit, an opening circuit, an electromagnetic counter, and an anti-jumping circuit;

[0012] The low gas pressure alarm control circuit includes an alarm intermediate relay and an alarm density control relay, and the normally open contact of the alarm density control relay is connected with the gas pressure alarm output contact;

[0013] The human-computer interface controller is configured to output a gas pressure alarm signal to the low gas pressure alarm control circuit through the gas pressure alarm output contact when detecting that the gas pressure of the sulfur hexafluoride circuit breaker is lower than a preset alarm threshold, so as to turn on the low gas pressure alarm control circuit.

[0014] The low gas pressure alarm control circuit is configured to control the alarm density control relay to act according to the received gas pressure alarm signal, so as to attract the alarm intermediate relay and connect the low gas pressure alarm intermediate relay terminal in the passive signal output line, and output a sulfur hexafluoride circuit breaker gas pressure alarm signal through the low gas pressure alarm intermediate relay terminal.

[0015] In further embodiments, the low pressure lockout control circuit comprises a lockout intermediate relay and a lockout density control relay, the normally open contact of the lockout density control relay being connected to the gas pressure lockout output contact;

[0016] The human-machine interface controller is configured to output a gas pressure lockout signal to the low pressure lockout control circuit through the gas pressure lockout output contact when the detected gas pressure of the SF6 circuit breaker is lower than the preset lockout threshold, so as to turn on the low pressure lockout control circuit.

[0017] The low pressure lockout control circuit is configured to control the lockout density control relay to act according to the received gas pressure lockout signal, so that the normally open contact of the lockout density control relay is closed, the lockout intermediate relay is attracted, and the normally closed contact of the lockout intermediate relay is opened, thereby disconnecting the closing circuit and the opening circuit.

[0018] In further embodiments, the closing circuit comprises the normally open contact of an energy storage auxiliary switch relay, the normally closed contact of an auxiliary switch relay, the closing relay coil, and the normally closed contact of the lockout intermediate relay, and the anti-bounce circuit comprises an anti-bounce relay.

[0019] The closing circuit is configured to, after receiving a circuit breaker closing signal, control the normally open contact of the energy storage auxiliary switch relay to be closed if it is detected that the circuit breaker mechanism box has stored energy, so that the positive power supply is led from the anti-bounce relay, the energy storage auxiliary switch relay, and the auxiliary switch relay in series to the closing relay coil and the electromagnetic counter.

[0020] In further embodiments, the control circuit is further configured to, when it is detected that the low pressure lockout control circuit is not turned on, control the normally closed contact of the lockout intermediate relay to be closed, at which time the control power supply of the control circuit is connected across the closing relay coil and the electromagnetic counter in parallel, the electromagnetic counter is incremented by one, and the closing relay coil is actuated.

[0021] The human-machine interface controller is configured to start the circuit breaker closing process by means of the closing relay coil normally open contact closing signal, and to output the circuit breaker closing state to the outside by means of the auxiliary switch relay after the circuit breaker is closed.

[0022] In further embodiments, the anti-bounce circuit is configured to, after the circuit breaker completes the closing action, control the normally open contact of the auxiliary switch relay to be closed, so that the anti-bounce relay is actuated, the normally closed contact of the anti-bounce relay and the normally closed contact of the auxiliary switch relay are opened, so as to cut off the positive power supply of the closing relay coil, and the normally open contact of the anti-bounce relay is closed, so that the anti-bounce relay remains actuated until the circuit breaker closing signal ends.

[0023] In a further embodiment, the tripping circuit comprises the normally open contact of the auxiliary switch relay, the tripping relay coil and the normally closed contact of the lockout intermediate relay;

[0024] The tripping circuit is configured to, after receiving the circuit breaker tripping signal, if it is detected that the circuit breaker has been closed, control the normally open contact of the auxiliary switch relay to be closed, and the positive power supply is led out from the normally open contact of the auxiliary switch relay to the tripping relay coil;

[0025] And if it is detected that the low pressure lockout control circuit is not turned on, the normally closed contact of the lockout intermediate relay is closed, at this time, the control power supply of the control circuit is connected across the tripping relay coil, and the tripping relay coil is actuated;

[0026] The human-computer interface controller is configured to start the circuit breaker tripping process through the tripping relay coil normally open contact closing signal, and after the circuit breaker is tripped, the circuit breaker tripping state is outputted to the outside through the auxiliary switch relay.

[0027] In a further embodiment, the operating mode switching knob is configured to switch between the on-site operation mode and the remote control operation mode of the circuit breaker mechanism box, so that in the remote control operation mode, the positive power supply is led out from the remote terminal block to the output end of the closing button or the tripping button through the changeover switch.

[0028] In a further embodiment, the circuit breaker mechanism box further comprises a heating and lighting circuit, wherein the heating and lighting circuit comprises a heating circuit and a lighting circuit.

[0029] The heating circuit is configured to automatically control the heater to work according to the temperature and humidity in the circuit breaker mechanism box.

[0030] The lighting circuit is configured to control the lighting lamp in the circuit breaker mechanism box to work through the lighting switch.

[0031] The application provides a circuit breaker mechanism box for a substation secondary training system, which comprises a human-machine interface controller, and the human-machine interface controller controls virtual elements in an energy storage loop and a control loop through virtual element connection terminals to simulate the energy storage state, SF6 pressure state and action state of an energy storage motor, a closing coil and a tripping coil of an actual circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structure block diagram of the circuit breaker mechanism box for the substation secondary training system provided by the embodiment of the application;

[0033] Figure 2 is a front view schematic diagram of the human-machine interface controller provided by the embodiment of the application;

[0034] Figure 3 is a rear view schematic diagram of the human-machine interface controller provided by the embodiment of the application;

[0035] Figure 4 is a connection terminal schematic diagram of the human-machine interface controller provided by the embodiment of the application;

[0036] Figure 5 is a connection terminal schematic diagram of the energy storage loop provided by the embodiment of the application;

[0037] Figure 6 is a connection terminal schematic diagram of the control loop provided by the embodiment of the application;

[0038] Figure 7 is a connection terminal schematic diagram of the heating and lighting loop provided by the embodiment of the application;

[0039] Figure 8 is a connection terminal schematic diagram of the passive signal output provided by the embodiment of the application. DETAILED DESCRIPTION

[0040] The embodiments of the application are specifically described below with reference to the drawings, and the embodiments are given only for illustrative purposes and cannot be understood as limiting the application, including the drawings are only for reference and illustrative use, and do not constitute a limitation on the protection scope of the patent of the application, because many changes can be made to the application without departing from the spirit and scope of the application.

[0041] ReferenceFigure 1 The circuit breaker mechanism box for the substation secondary training system provided by the embodiment of the present application is composed of a human-machine interface controller 101, an energy storage circuit 102, a control circuit 103, a passive signal output wiring 104 and a heating lighting circuit 105, as shown in the figure. Figure 2 The front and back of the circuit breaker mechanism box are designed with box doors, the front box body of the circuit breaker mechanism box is provided with a human-machine interface controller, an operating mode switching knob, a tripping button TA, a closing button HA, a lighting switch KN and a virtual element wiring terminal, and the virtual element wiring terminal is provided with simulated closing coil wiring terminals, tripping coil 1 wiring terminals, tripping coil 2 wiring terminals, energy storage motor wiring terminals, energy storage travel switch relay output contact points, gas pressure alarm output contact points and gas pressure locking output contact points.

[0042] As shown in the figure, the back box body of the circuit breaker mechanism box is provided with an energy storage power switch 2ZK, a heater power switch 3ZK, a contactor KM, an anti-jump relay CJX, an alarm intermediate relay 1ZJ, a locking intermediate relay 2ZJ, a temperature and humidity controller WSK, an electromagnetic counter JS and an external wiring terminal row (DP, X0, X1, X2, X5). Figure 3

[0043] In the embodiment, the human-machine interface controller is electrically connected with the energy storage circuit, the control circuit and the passive signal output wiring, as shown in the figure. Figure 4 The human-machine interface controller controls the virtual elements in the energy storage circuit and the control circuit through the virtual element wiring terminal to simulate the energy storage state, the SF6 (sulfur hexafluoride) pressure state, the circuit breaker state and the action state of the energy storage motor, the closing coil and the tripping coil of the real circuit breaker.

[0044] ​The programmable human-computer interface controller of the embodiment replaces the real circuit breaker body, spring energy storage and mechanical transmission mechanism, can replace the secondary wiring of the real circuit breaker mechanism box, and can set some abnormal failures of the mechanism box on the human-computer interface of the circuit breaker mechanism box. The circuit breaker mechanism box provided by the embodiment can be matched with the terminal box, relay protection device and intelligent terminal to build a complete secondary circuit of a substation in a practical training room, and solves the problems of large occupied area and high investment cost of the secondary wiring of the real circuit breaker mechanism box.

[0045] It should be noted that the energy storage circuit, control circuit and passive signal output wiring in the embodiment are connected together through the contact of the relay with the human-computer interface controller as a bridge. The programmable human-computer interface controller of the embodiment replaces the real circuit breaker body, spring energy storage and mechanical transmission mechanism, controls the spring energy storage and release of the circuit breaker, the on-off state change transmission of the circuit breaker and the output of the SF6 gas density meter, and the like through the programmable human-computer interface controller. When the energy storage circuit needs to store energy, the relay coil representing the energy storage motor in the energy storage circuit is energized through the energy storage motor wiring end to make the relay M act, and the normally open contact of the relay M is closed. After the human-computer interface controller completes the energy storage process, the energy storage travel switch relay output contact Y14 of the human-computer interface controller controls the relay representing the energy storage travel switch CK to act, the normally closed contact of the relay CK is disconnected, and the energy storage circuit is disconnected. The human-computer interface controller controls the relay representing the energy storage auxiliary switch DT to act through the energy storage auxiliary switch relay output contacts Y10-Y13, and the contacts of the DT relay are connected to the control circuit and the passive signal output. In the embodiment, the human-computer interface controller can not only display the state of the circuit breaker, but also set common abnormalities and failures. The common abnormalities and failures include SF6 gas pressure alarm, SF6 gas pressure locking, energy storage motor failure, travel switch abnormality, closing mechanism jamming, opening mechanism jamming, auxiliary switch failure and the like. Other abnormalities or failures can be set by those skilled in the art according to specific implementation conditions, and are not limited to the embodiment of the application.

[0046] In one embodiment, as shown in Figure 5 The energy storage control circuit 102 includes an energy storage control power supply, an energy storage power supply switch 2ZK, a mechanism energy storage signal lamp, an energy storage motor circuit connected with the energy storage motor relay coil and the contactor contact, and an energy storage control circuit connected with the energy storage travel switch relay output contact and the contactor contact. The mechanism energy storage signal lamp includes a mechanism not storing energy or storing energy signal lamp and a mechanism has stored energy signal lamp.

[0047] In the embodiment, the motor energy storage circuit 1021 is provided with the normally open contact of the contactor KM and the energy storage motor relay coil M between the normally open contact of the contactor KM, and the positive and negative poles of the energy storage control power source are connected to the 1, 2 and 3, 4 terminals of the energy storage power switch 2ZK respectively; wherein the contact of the contactor KM is used to control the working of the energy storage motor M.

[0048] The energy storage control circuit 1022 is provided with the normally closed contact of the energy storage stroke switch relay CK and the coil of the contactor KM connected in series, and the mechanism non-energy storage or energy storage signal lamp 1XD is connected in parallel to the two ends of the coil of the contactor KM; wherein the normally closed contact of the energy storage stroke switch relay CK is used to control the state of the mechanism non-energy storage or energy storage signal lamp 1XD and the attraction and release of the contactor KM; the mechanism energy storage signal lamp 2XD is connected to the positive and negative poles of the energy storage control power source respectively after being connected in series with the normally open contact of the energy storage stroke switch relay CK, and the normally open contact of the energy storage stroke switch relay CK is used to control the state of the mechanism energy storage signal lamp 2XD.

[0049] In the embodiment, the working principle of the energy storage circuit is as follows: the positive pole of the energy storage control power source is connected to the terminal row 19 and the terminal row 20 through the 3, 4 terminals of the energy storage power switch 2ZK from the terminal row X0-1; the negative pole of the energy storage control power source is connected to the terminal row 23 and the terminal row 24 through the 1, 2 terminals of the energy storage power switch 2ZK from the terminal row X0-3; when the spring of the circuit breaker mechanism box is not energy stored, the output contact Y4 of the human-computer interface controller has no output, at this time, the normally closed contact 1, 2 of the energy storage stroke switch relay CK is closed, the positive power source is connected to the terminal row 26 and the terminal row 27, the energy storage signal lamp 1XD is on, at the same time, the contactor KM is powered to be attracted, the two pairs of contacts 13, 14 and 43, 44 of the contactor KM are closed, the motor energy storage circuit is connected, the energy storage motor relay M is powered to work, the contact of the energy storage motor relay M is the energy storage motor wiring end X3 of the human-computer interface controller, and the human-computer interface controller starts the energy storage process; when the energy storage is completed, the output contact Y14 of the human-computer interface controller controls the action of the energy storage stroke switch relay CK, the normally closed contact 1, 2 of the energy storage stroke switch relay CK is disconnected from the energy storage control circuit, the energy storage signal lamp 1XD is off, at the same time, the contactor KM is released, the two pairs of contacts 13, 14 and 43, 44 of the contactor KM are disconnected, the motor energy storage circuit is disconnected, and the energy storage motor stops working; the normally open contact 1, 3 of the energy storage stroke switch relay CK is closed, the mechanism box energy storage signal lamp 2XD is connected, and the mechanism box energy storage signal lamp 2XD is on.

[0050] In one embodiment, the density control relay output contact includes a gas pressure alarm output contact Y15 and a gas pressure locking output contact Y16, as shown inFigure 6 As shown, the control circuit includes a control power supply, a low pressure alarm control circuit, a low pressure lockout control circuit, a close circuit, an open circuit, an electromagnetic counter, and an anti-jump circuit. In this embodiment, the low pressure alarm control circuit includes an alarm intermediate relay 1ZJ and an alarm density control relay MTK1, and the normally open contact of the alarm density control relay MTK1 is connected to the gas pressure alarm output contact Y15.

[0051] The human-machine interface controller is configured to output a gas pressure alarm signal to the low pressure alarm control circuit through the gas pressure alarm output contact Y15 when detecting that the gas pressure of the SF6 circuit breaker is lower than a preset alarm threshold, so as to turn on the low pressure alarm control circuit.

[0052] The low pressure alarm control circuit is configured to control the alarm density control relay MTK1 to act according to the received gas pressure alarm signal, so as to attract the alarm intermediate relay 1ZJ and connect the low pressure alarm intermediate relay terminal in the passive signal output wiring, and output a SF6 circuit breaker gas pressure alarm signal through the low pressure alarm intermediate relay terminal.

[0053] In this embodiment, the working principle of the low pressure alarm control circuit is as follows: the positive pole of the control power supply is connected to the terminal row 34 and the terminal row 35 from the terminal row X1-2; the negative pole of the control power supply is connected to the terminal row 40 and the terminal row 41 from the terminal row X1-8; when the gas pressure of the SF6 circuit breaker is lower than a preset alarm threshold, the gas pressure alarm output contact Y15 of the human-machine interface controller controls the alarm density control relay MTK1 to act, the 1 and 2 terminals of the alarm density control relay MTK1 are closed, the low pressure alarm control circuit is turned on, the alarm intermediate relay 1ZJ is attracted, and the passive signal output wiring is connected through the contacts 13, 14, 43, and 44 of the alarm intermediate relay 1ZJ.

[0054] In one embodiment, the low pressure lockout control circuit includes a lockout intermediate relay 2ZJ and a lockout density control relay MTK2, and the lockout density control relay MTK2 is connected to the gas pressure lockout output contact Y16.

[0055] The human-machine interface controller is configured to output a gas pressure lockout signal to the low pressure lockout control circuit through the gas pressure lockout output contact Y16 when detecting that the gas pressure of the SF6 circuit breaker is lower than a preset lockout threshold, so as to turn on the low pressure lockout control circuit.

[0056] The low pressure locking control circuit is used for controlling the action of the locking density control relay MTK2 according to the received gas pressure locking signal, so that the A1 and A2 terminals of the locking intermediate relay 2ZJ are electrified, the locking intermediate relay is attracted, the normally closed contacts 51 and 52 of the locking intermediate relay 2ZJ are disconnected, and the closing circuit and the opening circuit are disconnected.

[0057] In the embodiment, the working principle of the low pressure locking control circuit is specifically as follows: in the low pressure locking control circuit, when the SF6 circuit breaker gas pressure is lower than the preset locking threshold, the gas pressure locking output contact Y16 of the human-computer interface controller controls the action of the locking density control relay MTK2 representing the density controller MTK, the 3 and 4 terminals of the locking density control relay MTK2 are closed, the low pressure locking control circuit is connected, the locking intermediate relay 2ZJ is attracted, the normally closed contacts 51 and 52 of the locking intermediate relay 2ZJ are disconnected, the closing circuit and the opening circuit are disconnected, and the circuit breaker closing and opening are prohibited.

[0058] In one embodiment, the closing circuit includes the normally open contacts of the energy storage auxiliary switch relay DT, the normally closed contacts of the auxiliary switch relay DL, the closing relay coil HQ connected with the closing coil connection terminal X0 and the normally closed contacts of the locking intermediate relay, and the anti-jump circuit includes the anti-jump relay CJX.

[0059] The closing circuit is used for, after receiving the circuit breaker closing signal, if it is detected that the circuit breaker mechanism box has stored energy, then the normally open contacts 2 and 4 of the energy storage auxiliary switch relay DT are closed, the positive power supply is led out from the 21 and 22 contacts of the anti-jump relay CJX in series, the 2 and 4 terminals of the energy storage auxiliary switch relay DT and the normally closed contacts 1 and 2 of the auxiliary switch relay DL to the closing relay coil HQ and the electromagnetic counter JS, and when it is detected that the low pressure locking control circuit is not connected, the normally closed contacts 51 and 52 of the locking intermediate relay 2ZJ are closed, at this time, the control power supply of the control circuit is connected across the closing relay coil HQ and the electromagnetic counter JS in parallel, the electromagnetic counter JS is incremented by one, and the closing relay coil HQ is actuated.

[0060] The human-computer interface controller is used for starting the circuit breaker closing process through the closing relay coil normally open contact closing signal, and outputting the circuit breaker closing state to the outside through the auxiliary switch relay after the circuit breaker is closed.

[0061] The anti-jump circuit is used for, after the circuit breaker completes the closing action, closing the normally open contacts 18 and 20 of the auxiliary switch relay DL, so that the normally open contacts 13 and 14 of the anti-jump relay CJX are closed and the anti-jump relay CJX is kept actuated until the circuit breaker closing signal ends.

[0062] In the embodiment, the operation mode switching knob is used to switch the on-site operation mode and the remote control operation mode of the relay mechanism box, so that the closing circuit or the opening circuit in the remote control operation mode leads the positive power supply from the remote terminal row X1-4, X1-6 to the output end of the closing button HA or the opening button TA through the change-over switch. In order to facilitate understanding, the closing control process will be specifically described below.

[0063] In the closing control process, when switching to the on-site operation mode, the positive power supply enters the terminal row 48 from the terminal row 34 through the 1, 2 terminals of the change-over switch HK, and the closing button HA is pressed to make the positive power supply enter the terminal row 30; when switching to the remote control mode, the positive power supply enters the terminal row 30 from the terminal row X1-4 through the 3, 4 terminals of the change-over switch HK.

[0064] If the circuit breaker mechanism box has stored energy, the normally open contacts 2, 4 of the energy storage auxiliary switch relay DT are closed, the positive power supply enters the terminal row 7 from the terminal row 2 through the 21, 22 contacts of the anti-jump relay CJX, and then through the 2, 4 terminals of the energy storage auxiliary switch relay DT and the 1, 2 normally closed contacts of the auxiliary switch relay DL; if the circuit breaker has no SF6 pressure reduction lock, the normally closed contacts 51, 52 of the lock intermediate relay 2ZJ are closed, at this time, the control power supply is applied to the closing coil HQ and the electromagnetic counter JS, the number of actions of the electromagnetic counter JS is increased by one, the closing relay HQ is connected to the control circuit through the coil of the relay HQ, the closing relay HQ is actuated, and the human-machine interface controller starts the circuit breaker closing process.

[0065] When the circuit breaker completes the closing, the human-machine interface controller controls the auxiliary switch relay DL to actuate, the normally closed contacts of the auxiliary switch relay DL are opened and the normally open contacts are closed, the normally closed contacts 1, 2 of the auxiliary switch relay DL are opened to cut off the positive power supply of the closing relay HQ to prevent the closing relay HQ from being energized for a long time; the normally open contacts 18, 20 of the auxiliary switch relay DL are closed to actuate the anti-jump relay CJX, the normally open contacts 13, 14 of the anti-jump relay CJX are closed to keep the anti-jump relay CJX in the actuated state until the closing signal ends, and the normally closed contacts 21, 22 of the anti-jump relay CJX are opened to disconnect the closing circuit and prevent the circuit breaker from repeatedly opening and closing when the closing encounters a line fault.

[0066] In one embodiment, the opening circuit includes the normally open contacts of the auxiliary switch relay, the opening relay coil TQ, and the normally closed contacts of the lock intermediate relay.

[0067] The opening circuit is used to, after receiving the circuit breaker opening signal, if detecting that the circuit breaker has been closed, control the normally open contact 10, 12 of the auxiliary switch relay DL to be closed, the positive power supply reaches the opening relay coil TQ from the normally open contact 10, 12 of the auxiliary switch relay DL, and if detecting that the low pressure locking control circuit is not connected, the normally closed contact 51, 52 of the locking intermediate relay 2ZJ is closed, at this time, the control power supply of the control circuit is connected across the opening relay coil TQ, and the opening relay coil TQ is activated.

[0068] The human-computer interface controller is used to start the circuit breaker opening process through the normally open contact closing signal of the opening relay coil TQ, and after the circuit breaker is opened, the opening state of the circuit breaker is outputted to the outside through the auxiliary switch relay.

[0069] In the embodiment, the opening control process is specifically as follows: when switching to the local operation mode, the positive power supply enters the terminal row 49 from the terminal row 34 through the 1, 2 terminals of the conversion switch HK, the opening button TA is pressed, and the positive power supply enters the terminal row 36; when switching to the remote control mode, the positive power supply enters the terminal row 36 from the terminal row X1-6 through the 7, 8 terminals of the conversion switch HK.

[0070] If the circuit breaker has been closed, the normally open contact 10, 12 of the circuit breaker auxiliary switch DL is controlled to be closed, the positive power supply reaches the terminal row 15 from the terminal row DP-36 through the normally open contact 10, 12 of the auxiliary switch relay DL, if the circuit breaker has no SF6 pressure reduction locking, the normally closed contact 51, 52 of the locking intermediate relay 2ZJ is controlled to be closed, at this time, the control power supply is connected across the opening relay coil TQ, the opening relay coil TQ is connected to the control circuit through the coil of the relay TQ, and the opening relay coil TQ is activated to control the circuit breaker opening process. When the circuit breaker is completed, the human-computer interface controller controls the auxiliary switch relay DL to stop working, the normally closed contact of the auxiliary switch relay DL is closed, the normally open contact is opened, then the normally open contact 10, 12 of the auxiliary switch relay DL is opened, the positive power supply of the opening relay coil TQ is cut off, and the opening relay coil TQ is prevented from being energized for a long time.

[0071] In one embodiment, the circuit breaker mechanism box further comprises a heating and lighting circuit, the heating and lighting circuit comprises a heating circuit and a lighting circuit; the heating circuit is used to automatically control the heater to work according to the temperature and humidity in the circuit breaker mechanism box; and the lighting circuit is used to control the lighting lamp in the circuit breaker mechanism box to work through the lighting switch.

[0072] As Figure 7As shown, the positive terminal of the control power supply is connected from terminal block X0-11 through terminals 3 and 4 of the heating power switch ZK3 to terminal blocks 45 and 46; the negative terminal of the control power supply is connected from terminal block X0-13 through terminals 1 and 2 of the heating power switch ZK3 to terminal blocks 43 and 44; in the heating circuit, the temperature and humidity controller WSK automatically controls the heater DJR to work according to the temperature and humidity inside the chamber; in the lighting circuit, the lighting switch KN controls the lighting lamp 3XD to work.

[0073] like Figure 8 As shown, in the passive signal output wiring, terminals X5-1 to X5-13 in terminal block X5 are common terminals for output signals. Terminal X5-28 outputs a signal to switch to local operation mode, terminal X5-29 outputs a signal to switch to remote control mode, terminal X5-30 outputs a motor circuit power-off signal, terminal X5-31 outputs a heating and lighting circuit power-off signal, terminals X5-34 and X5-35 output SF6 pressure reduction alarm signals, terminals X5-36 and X5-37 output a mechanism not charged signal, terminals X5-38 and X5-39 output a mechanism charged signal, and terminals X5-40 and X5-41 output SF6 pressure reduction interlocking signals.

[0074] The circuit breaker mechanism box provided in this embodiment only retains the mechanism box in the primary part, saving investment and floor space. At the same time, the abnormal faults of the circuit breaker can be flexibly set in the human-machine interface controller of the circuit breaker mechanism box. The circuit breaker mechanism box of this embodiment can be used with terminal boxes, relay protection devices and intelligent terminals to build a complete secondary circuit of the substation in the training room.

[0075] This invention provides a circuit breaker mechanism box for a substation secondary training system. The circuit breaker mechanism box includes a human-machine interface (HMI) controller and virtual component terminals mounted on it. The HMI controller controls virtual components in the energy storage circuit and control circuit via the virtual component terminals to simulate the energy storage state of a real circuit breaker, the gas pressure state of a sulfur hexafluoride (SF6) circuit breaker, and the operating states of the energy storage motor, closing coil, and opening coil. Compared with existing technologies, this invention implements the functions of a real circuit breaker body, spring energy storage, and mechanical transmission mechanism through a programmable HMI controller. It has realistic control circuit wiring, can replace the secondary wiring of a real circuit breaker mechanism box, and has a simple control principle. Furthermore, the HMI controller allows for flexible setting of abnormal faults in the circuit breaker through a fault setting interface, greatly improving the flexibility and ease of use of the circuit breaker mechanism box. It has advantages such as simple structure, easy operation, and good safety.

[0076] The above embodiments only express several preferred embodiments of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation to the patent scope of the application. It should be pointed out that, for ordinary skilled in the art, several improvements and replacements can be made without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the protection scope of the claims.

Claims

1. A circuit breaker mechanism box for a substation secondary training system, characterized in that, include: The circuit breaker mechanism box includes a human-machine interface controller, an operation mode switching knob, a trip button, a closing button, a lighting switch, and virtual element terminals; wherein, the virtual element terminals are equipped with simulated trip coil terminals, closing coil terminals, energy storage motor terminals, auxiliary switch relay output contacts, energy storage auxiliary switch relay output contacts, energy storage limit switch relay output contacts, and density control relay output contacts; The human-machine interface controller is electrically connected to the energy storage circuit, the control circuit, and the passive signal output wiring. The human-machine interface controller is used to control the virtual elements in the energy storage circuit and the control circuit through the virtual element wiring terminals to simulate the energy storage state of the real circuit breaker, the gas pressure state of the sulfur hexafluoride circuit breaker, and the operating state of the energy storage motor, the closing coil, and the opening coil. The energy storage circuit includes an energy storage control power supply, an energy storage power switch, a mechanism energy storage indicator light, a motor energy storage circuit connected to the energy storage motor relay coil, and an energy storage control circuit connected to the output contact of the energy storage limit switch relay; wherein, the mechanism energy storage indicator light includes an indicator light for the mechanism not storing energy or storing energy and an indicator light for the mechanism having stored energy. The motor energy storage circuit is provided with two normally open contacts of the contactors and an energy storage motor relay coil disposed between the two normally open contacts of the contactors. The two ends of the motor energy storage circuit are respectively connected to the positive and negative terminals of the energy storage control power supply through the energy storage power switch; wherein, the contactors are used to control the operation of the energy storage motor. The energy storage control circuit is equipped with a normally closed contact of an energy storage limit switch relay and a contactor coil connected in series. The indicator light for when the mechanism is not storing energy or is storing energy is connected in parallel across the two ends of the contactor coil. The normally closed contact of the energy storage limit switch relay is used to control the state of the indicator light for when the mechanism is not storing energy or is storing energy, as well as the engagement and disengagement of the contactor. The normally open contact of the energy storage indicator light and the energy storage limit switch relay are connected in series to the positive and negative terminals of the energy storage control power supply, respectively. The normally open contact of the energy storage limit switch relay is used to control the state of the energy storage indicator light.

2. The circuit breaker mechanism box for a substation secondary training system as described in claim 1, characterized in that: The density control relay output contacts include a gas pressure alarm output contact and a gas pressure interlock output contact. The control circuit includes a control power supply, a low gas pressure alarm control circuit, a low gas pressure interlock control circuit, a closing circuit, a opening circuit, an electromagnetic counter, and an anti-pumping circuit. The low gas pressure alarm control circuit includes an alarm intermediate relay and an alarm density control relay, wherein the normally open contact of the alarm density control relay is connected to the gas pressure alarm output contact. The human-machine interface controller is used to output a gas pressure alarm signal to the low gas pressure alarm control circuit through a gas pressure alarm output contact when the gas pressure of the sulfur hexafluoride circuit breaker is detected to be lower than a preset alarm threshold, so as to connect the low gas pressure alarm control circuit. The low-pressure alarm control circuit is used to control the alarm density control relay to operate according to the received gas pressure alarm signal, so that the alarm intermediate relay is energized and connected to the low-pressure alarm intermediate relay terminal in the passive signal output wiring, and outputs the sulfur hexafluoride circuit breaker gas pressure alarm signal through the low-pressure alarm intermediate relay terminal.

3. A circuit breaker mechanism box for a substation secondary training system as described in claim 2, characterized in that: The low-pressure interlock control circuit includes an interlock intermediate relay and an interlock density control relay, wherein the normally open contact of the interlock density control relay is connected to the gas pressure interlock output contact. The human-machine interface controller is used to output a gas pressure lockout signal to the low-pressure lockout control circuit through the gas pressure lockout output contact when the gas pressure of the sulfur hexafluoride circuit breaker is detected to be lower than the preset lockout threshold, so as to connect the low-pressure lockout control circuit. The low-pressure interlocking control circuit is used to control the interlocking density control relay to operate according to the received gas pressure interlocking signal. The normally open contact of the interlocking density control relay closes, causing the interlocking intermediate relay to engage. The normally closed contact of the interlocking intermediate relay opens, disconnecting the closing circuit and the opening circuit.

4. A circuit breaker mechanism box for a substation secondary training system as described in claim 3, characterized in that: The closing circuit includes a normally open contact of an energy storage auxiliary switch relay, a normally closed contact of an auxiliary switch relay, a closing relay coil, and a normally closed contact of a lockout intermediate relay; the anti-pumping circuit includes an anti-pumping relay. The closing circuit is used to control the normally open contact of the energy storage auxiliary switch relay to close after receiving the circuit breaker closing signal and detecting that the circuit breaker mechanism box has stored energy. The positive power supply is led out from the anti-pumping relay, the energy storage auxiliary switch relay and the auxiliary switch relay connected in series to the closing relay coil and the electromagnetic counter.

5. A circuit breaker mechanism box for a substation secondary training system as described in claim 4, characterized in that: The control circuit is also used to close the normally closed contact of the interlocking intermediate relay when the low pressure interlocking control circuit is detected to be not connected. At this time, the control power supply of the control circuit is connected to the two ends of the parallel closing relay coil and the electromagnetic counter. The electromagnetic counter is incremented by one, and the closing relay coil is activated. The human-machine interface controller is used to initiate the circuit breaker closing process by closing the normally open contact of the closing relay coil. After the circuit breaker is closed, the closing status of the circuit breaker is output to the outside through the auxiliary switch relay.

6. A circuit breaker mechanism box for a substation secondary training system as described in claim 5, characterized in that: The anti-pumping circuit is used to close the normally open contact of the auxiliary switch relay after the circuit breaker completes the closing action, so as to activate the anti-pumping relay. The normally closed contact of the anti-pumping relay and the normally closed contact of the auxiliary switch relay are opened to cut off the positive power supply to the closing relay coil. The normally open contact of the anti-pumping relay is closed to keep the anti-pumping relay activated until the circuit breaker closing signal ends.

7. A circuit breaker mechanism box for a substation secondary training system as described in claim 6, characterized in that: The tripping circuit includes the normally open contact of the auxiliary switch relay, the tripping relay coil, and the normally closed contact of the interlocking intermediate relay. The tripping circuit is used to control the normally open contact of the auxiliary switch relay to close after receiving the circuit breaker tripping signal and detecting that the circuit breaker has been closed. Positive power is then drawn from the normally open contact of the auxiliary switch relay to the tripping relay coil. Furthermore, if the low-pressure interlocking control circuit is detected to be not connected, the normally closed contact of the interlocking intermediate relay is closed. At this time, the control power supply of the control circuit is connected to both ends of the trip relay coil, and the trip relay coil is activated. The human-machine interface controller is used to initiate the circuit breaker tripping process by closing the normally open contact of the tripping relay coil. After the circuit breaker trips, the tripping status is output to the outside through the auxiliary switch relay.

8. A circuit breaker mechanism box for a substation secondary training system as described in claim 2, characterized in that: The operation mode switching knob is used to switch between the local operation mode and the remote control operation mode of the circuit breaker mechanism box, so that in the remote control operation mode, the positive power supply of the closing circuit or the opening circuit is led out from the remote terminal block through the changeover switch to the output terminal of the closing button or the opening button.

9. A circuit breaker mechanism box for a substation secondary training system as described in claim 1, characterized in that: It also includes a heating and lighting circuit, which comprises a heating circuit and a lighting circuit; The heating circuit is used to automatically control the operation of the heater according to the temperature and humidity inside the circuit breaker mechanism box; The lighting circuit is used to control the operation of the lights inside the circuit breaker mechanism box via a lighting switch.

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