CN211530718U - Circuit for preventing primary equipment from inducting electrification during debugging of transformer substation protection measurement and control device - Google Patents
Circuit for preventing primary equipment from inducting electrification during debugging of transformer substation protection measurement and control device Download PDFInfo
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- CN211530718U CN211530718U CN201922121844.2U CN201922121844U CN211530718U CN 211530718 U CN211530718 U CN 211530718U CN 201922121844 U CN201922121844 U CN 201922121844U CN 211530718 U CN211530718 U CN 211530718U
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Abstract
The application provides a circuit that primary equipment response is electrified when preventing transformer substation's protection measurement and control device debugging includes: the detection circuit comprises a first detection circuit and a second detection circuit, the first detection circuit is used for detecting whether the output end of the relay protection tester is electrified or not and transmitting the information of whether the output end of the tester is electrified or not to the on-off control circuit, and the second detection circuit is used for detecting whether a secondary circuit of a bus voltage transformer of the transformer substation is communicated with a voltage terminal row of a transformer substation protection measurement and control device or not and transmitting the communicated information to the on-off control circuit; and the on-off control circuit is used for receiving the information transmitted by the detection circuit and controlling the on-off of the output voltage terminal of the relay protection tester and the voltage terminal row of the transformer substation protection measurement and control device according to the information and the output state of the relay protection tester. The circuit can effectively avoid the situation that primary equipment is electrified in an induction mode when the transformer substation protection measurement and control device is debugged.
Description
Technical Field
The utility model relates to an on-off control circuit field especially relates to an electrified circuit of primary equipment response when preventing transformer substation's protection measurement and control device debugging.
Background
After the transformer substation protection measurement and control device is newly built or operates for a period of time, a relay protection tester is required to verify the device. In the checking process, output voltage and current terminals of the relay protection tester are connected with a terminal row of a protection measurement and control screen, and in the operation process, due to the uncertainty of the technical level and the mental state of an operator, misoperation is possible, and serious potential safety hazards are brought to the safe operation of a power grid. Usually, the secondary side of the bus voltage transformer is connected with a voltage sampling terminal row of the protection measurement and control device through a terminal row connecting piece, in the test process, the voltage terminal connecting piece is cut open, and an output voltage terminal of the relay protection tester is connected to the side, close to the protection measurement and control device, of the voltage terminal row of the protection measurement and control screen through a wire. If misoperation, arrange relay protection tester output voltage terminal and protection observe and control screen voltage terminal and lean on bus voltage transformer secondary circuit side, and when secondary circuit and bus voltage transformer secondary side intercommunication, when relay protection tester output voltage, will be in bus voltage transformer primary side induction production high voltage, bring the potential safety hazard for the person, electric wire netting, equipment.
Therefore, a circuit for preventing primary equipment from being electrified by induction when a transformer substation protection measurement and control device is debugged is needed.
SUMMERY OF THE UTILITY MODEL
In view of this, the present application provides a circuit for preventing primary equipment from inducing electrification during debugging of a transformer substation protection measurement and control device, which has solved the deficiencies of the prior art.
The utility model provides a circuit that primary equipment response is electrified when preventing transformer substation's protection measurement and control device debugging, its characterized in that: the method comprises the following steps: the starting circuit, the detection circuit and the on-off control circuit;
the starting circuit is used for starting the detection circuit;
the detection circuit comprises a first detection circuit and a second detection circuit, the first detection circuit is used for detecting whether the output end of the relay protection tester is electrified or not and transmitting the information of whether the output end of the tester is electrified or not to the on-off control circuit, and the second detection circuit is used for detecting whether a secondary circuit of a bus voltage transformer of the transformer substation is communicated with a voltage terminal row of the transformer substation protection measurement and control device or not and transmitting the communication information to the on-off control circuit;
and the on-off control circuit is used for receiving the information transmitted by the detection circuit and controlling the on-off of the output voltage terminal of the relay protection tester and the voltage terminal row of the transformer substation protection measurement and control device according to the information and the output state of the relay protection tester.
Further, the first detection circuit comprises a transformer T1, a transformer T2, a transformer T3, a three-phase rectifier bridge D1, a resistor R1, a capacitor C1 and an optocoupler G1;
one end of the primary side of a transformer T1 is electrically connected with the phase A of the output end of the relay protection tester, the other end of the primary side of a transformer T1 is grounded, one end of the secondary side of a transformer T1 is connected with the phase A input end of a three-phase rectifier bridge D1, one end of the primary side of a transformer T2 is electrically connected with the phase B of the output end of the relay protection tester, the other end of the primary side of a transformer T2 is grounded, one end of the secondary side of a transformer T2 is connected with the phase B input end of the three-phase rectifier bridge D1, one end of the primary side of a transformer T3 is electrically connected with the phase C of the output end of the relay protection tester, the other end of the primary side of a transformer T3 is grounded, one end of the secondary side of a transformer T3 is connected with the phase C input end of the three-phase rectifier bridge D1, the other end of the, the positive output end of the rectifier bridge D1 is connected with one end of a capacitor C1, the other end of the capacitor C1 is grounded, one end of a resistor R1 is connected with a common connection point of the positive output ends of the capacitor C1 and the rectifier bridge D1, the other end of the resistor R1 is connected with the anode of a light-emitting diode of the optocoupler G1, the cathode of the light-emitting diode of the optocoupler G1 is grounded, the collector of a triode of the optocoupler G1 is connected with a direct current power supply, and the emitter of the triode of the optocoupler G1 is grounded.
Further, the second detection circuit comprises a resistor R2, a resistor R3, a resistor R4, an adjustable resistor R5, a resistor R6, a comparator U1, a comparator U2, a comparator U3, a NOR gate circuit U4 and an optical coupler G2;
one end of a resistor R2 is connected with a direct-current power supply, the other end of the resistor R2 is electrically connected with a phase A of a transformer substation protection and control device voltage terminal row, one end of a resistor R3 is connected with the direct-current power supply, the other end of a resistor R3 is electrically connected with a phase B of the transformer substation protection and control device voltage terminal row, one end of a resistor R4 is connected with the direct-current power supply, the other end of a resistor R4 is electrically connected with a phase C of the transformer substation protection and control device voltage terminal row, one end of an adjustable resistor R5 is connected with the direct-current power supply, the other end of an adjustable resistor R5 is grounded, a control end of the adjustable resistor is respectively connected with the same-phase ends of a comparator U1, a comparator U2 and a comparator U3, an inverting end of the comparator U1 is connected with a common connection point of the resistor R2 and the phase A, an inverting end of the comparator U2 is connected with a common connection point of the resistors R3 and the phase B, an inverting, the output ends of the comparator U1, the comparator U2 and the comparator U3 are connected with the input end of the NOR gate circuit U4, the output end of the NOR gate U4 is connected with the negative electrode of the light-emitting diode of the optocoupler G2, the positive electrode of the light-emitting diode of the optocoupler G2 is connected with a direct current power supply through a resistor R6, the collector electrode of the triode of the optocoupler G2 is connected with the direct current power supply, and the emitter electrode of the triode of the optocoupler G2 is grounded.
Further, the on-off control circuit comprises a relay KA1, a relay KA3 and a relay KA 4;
the normally open contact of relay KA4 is established ties with relay KA 3's normally closed contact, relay KA 4's normally open contact's the other end is connected with DC power supply, the one end and the DC power supply of relay KA 4's coil are connected, relay KA 4's the other end with the collecting electrode of first detection circuitry's opto-coupler G1's triode is connected, the one end and the DC power supply of relay KA3 coil are connected, the other end and the collecting electrode of second detection circuitry's opto-coupler G2's triode of relay KA3 are connected, relay KA 1's coil one end is connected with relay KA 3's normally closed contact's one end, the other end ground connection of relay KA 1's coil, relay KA 1's normally open contact's one end is connected with relay protection tester's output, relay KA 1's normally open contact's the other end and transformer substation protection.
Further, the starting circuit comprises a button switch S1 and a relay KA2, one end of the button switch S1 is connected with a direct-current power supply, the other end of the button switch S1 is connected with one end of a coil of the relay KA2, the other end of the relay KA2 is grounded, and a normally open contact of the relay KA2 is arranged between a voltage terminal bar of the transformer substation protection measurement and control device and connecting lines of a resistor R2, a resistor R3 and a resistor R4.
Further, the circuit also comprises an alarm circuit A1, which is used for sending out warning information when a voltage terminal row of the transformer substation protection measurement and control device is communicated with a secondary circuit of a transformer substation bus voltage transformer, and two ends of the alarm circuit A1 are connected with a coil of the relay KA3 in parallel.
The utility model has the advantages that: the utility model provides a circuit that primary equipment response is electrified when preventing transformer substation protection measurement and control device debugging, when carrying out the check-up to transformer substation protection measurement and control device, can the automatic detection protection observe and control the connection status of screen voltage terminal row with bus voltage transformer secondary side return circuit, when the voltage terminal row that detects transformer substation protection measurement and control device communicates with bus voltage transformer secondary side, can be connected and report to the police between the output of automatic disconnection relay protection tester and the voltage terminal row, can effectively avoid leading to voltage to send back to bus voltage transformer because of staff misoperation once and cause the person, the electric wire netting, equipment incident, thereby improve the security of transformer substation protection measurement and control device check-up work.
Drawings
The invention will be further described with reference to the following figures and examples:
fig. 1 is a circuit block diagram of the present invention.
Fig. 2 is a schematic diagram of a first detection circuit according to the present invention.
Fig. 3 is a schematic diagram of a second detection circuit and an alarm circuit a1 according to the present invention.
Fig. 4 is a schematic diagram of the on-off control circuit of the present invention.
Fig. 5 is a schematic diagram of the starting circuit of the present invention.
Detailed Description
The invention is further explained by the following combined with the attached drawings of the specification:
the utility model provides a circuit that primary equipment response is electrified when preventing transformer substation's protection measurement and control device debugging, its characterized in that: the method comprises the following steps: the starting circuit, the detection circuit and the on-off control circuit; as shown in figure 1 of the drawings, in which,
the starting circuit is used for starting the detection circuit;
the detection circuit comprises a first detection circuit and a second detection circuit, the first detection circuit is used for detecting whether the output end of the relay protection tester is electrified or not and transmitting the information of whether the output end of the tester is electrified or not to the on-off control circuit, and the second detection circuit is used for detecting whether a secondary circuit of a bus voltage transformer of the transformer substation is communicated with a voltage terminal row of the transformer substation protection measurement and control device or not and transmitting the communication information to the on-off control circuit;
and the on-off control circuit is used for receiving the information transmitted by the detection circuit and controlling the on-off of the output voltage terminal of the relay protection tester and the voltage terminal row of the transformer substation protection measurement and control device according to the information and the output state of the relay protection tester.
Through the technical scheme, when the transformer substation protection measurement and control device is checked, the connection state of the protection measurement and control screen voltage terminal row and the secondary side loop of the bus voltage transformer can be automatically detected, when the voltage terminal row is communicated with the secondary side of the bus voltage transformer, the connection between the relay protection tester and the voltage terminal row can be automatically disconnected, and an alarm is given, so that the situation that the person, the power grid and the equipment safety accident are caused when the voltage is returned to the primary side of the bus voltage transformer due to the operation error of workers can be effectively avoided, and the safety of the checking work of the protection measurement and control device is improved.
In the present embodiment, as shown in fig. 2,
the first detection circuit comprises a transformer T1, a transformer T2, a transformer T3, a three-phase rectifier bridge D1, a resistor R1, a capacitor C1 and an optical coupler G1;
one end of the primary side of a transformer T1 is electrically connected with the phase A of the output end of the relay protection tester, the other end of the primary side of a transformer T1 is grounded, one end of the secondary side of a transformer T1 is connected with the phase A input end of a three-phase rectifier bridge D1, one end of the primary side of a transformer T2 is electrically connected with the phase B of the output end of the relay protection tester, the other end of the primary side of a transformer T2 is grounded, one end of the secondary side of a transformer T2 is connected with the phase B input end of the three-phase rectifier bridge D1, one end of the primary side of a transformer T3 is electrically connected with the phase C of the output end of the relay protection tester, the other end of the primary side of a transformer T3 is grounded, one end of the secondary side of a transformer T3 is connected with the phase C input end of the three-phase rectifier bridge D1, the other end of the, the positive output end of the rectifier bridge D1 is connected with one end of a capacitor C1, the other end of the capacitor C1 is grounded, one end of a resistor R1 is connected with a common connection point of the positive output ends of the capacitor C1 and the rectifier bridge D1, the other end of the resistor R1 is connected with the anode of a light-emitting diode of the optocoupler G1, the cathode of the light-emitting diode of the optocoupler G1 is grounded, the collector of a triode of the optocoupler G1 is connected with a direct current power supply, and the emitter of the triode of the optocoupler G1 is grounded.
Through the technical scheme, when one or more of three phases of a voltage output terminal A, B, C of the relay protection tester are electrified, the voltage is reduced through a transformer T1, a transformer T2 or a transformer T3, alternating current is converted into direct current through a rectifier bridge D1, and the direct current is electrified and conducted through a resistor R1 and an optical coupler Q1; and on the contrary, the optical coupler Q1 is cut off.
In this embodiment, as shown in fig. 3, the second detection circuit includes a resistor R2, a resistor R3, a resistor R4, an adjustable resistor R5, a resistor R6, a comparator U1, a comparator U2, a comparator U3, a nor gate circuit U4, and an optical coupler G2;
one end of a resistor R2 is connected with a direct-current power supply, the other end of the resistor R2 is electrically connected with a phase A of a transformer substation protection and control device voltage terminal row, one end of a resistor R3 is connected with the direct-current power supply, the other end of a resistor R3 is electrically connected with a phase B of the transformer substation protection and control device voltage terminal row, one end of a resistor R4 is connected with the direct-current power supply, the other end of a resistor R4 is electrically connected with a phase C of the transformer substation protection and control device voltage terminal row, one end of an adjustable resistor R5 is connected with the direct-current power supply, the other end of an adjustable resistor R5 is grounded, a control end of the adjustable resistor is respectively connected with the same-phase ends of a comparator U1, a comparator U2 and a comparator U3, an inverting end of the comparator U1 is connected with a common connection point of the resistor R2 and the phase A, an inverting end of the comparator U2 is connected with a common connection point of the resistors R3 and the phase B, an inverting, the output ends of the comparator U1, the comparator U2 and the comparator U3 are connected with the input end of the NOR gate circuit U4, the output end of the NOR gate U4 is connected with the negative electrode of the light-emitting diode of the optocoupler G2, the positive electrode of the light-emitting diode of the optocoupler G2 is connected with a direct current power supply through a resistor R6, the collector electrode of the triode of the optocoupler G2 is connected with the direct current power supply, and the emitter electrode of the triode of the optocoupler G2 is grounded.
Through above-mentioned technical scheme, when detecting starting circuit during operation, relay KA2 normally open contact is closed, if transformer protection measurement and control device voltage terminal row A, B, C three-phase or when certain phase communicates with bus voltage transformer secondary circuit, comparator U1, U2, U3 correspond the output high level, NOR gate U4 output low level, opto-coupler G2 gets the electricity and switches on, relay KA3 coil gets the electricity, relay KA 3's normally closed contact action, move from the closed state for the off-state.
In the present embodiment, as shown in fig. 4, the on-off control circuit includes a relay KA1, a relay KA3, and a relay KA 4;
the normally open contact of relay KA4 is established ties with relay KA 3's normally closed contact, relay KA 4's normally open contact's the other end is connected with DC power supply, the one end and the DC power supply of relay KA 4's coil are connected, relay KA 4's the other end with the collecting electrode of first detection circuitry's opto-coupler G1's triode is connected, the one end and the DC power supply of relay KA3 coil are connected, the other end and the collecting electrode of second detection circuitry's opto-coupler G2's triode of relay KA3 are connected, relay KA 1's coil one end is connected with relay KA 3's normally closed contact's one end, the other end ground connection of relay KA 1's coil, relay KA 1's normally open contact's one end is connected with relay protection tester's output, relay KA 1's normally open contact's the other end and transformer substation protection.
The working principle is as follows:
when the detection starting circuit works, a normally open node of the relay KA2 is closed, if a voltage terminal row A, B, C of the transformer protection measurement and control device is communicated with three phases or a certain phase of the transformer protection measurement and control device is communicated with a secondary circuit of a bus voltage transformer, high levels are correspondingly output by the comparators U1, U2 and U3, a NOR gate U4 outputs low levels, an optical coupler G2 is electrified and conducted, a coil of the relay KA3 is electrified, a normally closed contact of the relay KA3 acts, and the relay KA3 acts from a closed state to an open state; the coil of the relay KA1 is not powered, the normally open contact of the relay KA1 does not act, and the relay protection tester voltage output terminal and the transformer substation protection measurement and control device voltage terminal row are kept in a disconnected state, so that when any phase of the transformer protection measurement and control device voltage terminal row A, B, C is communicated with the bus voltage transformer secondary circuit, the relay protection tester voltage output terminal is disconnected with the transformer protection measurement and control device voltage terminal row, and primary equipment is prevented from being electrified in an induction mode during debugging of the transformer substation protection measurement and control device;
when any phase of the voltage terminal row A, B, C of the transformer protection measurement and control device is not communicated with a secondary circuit of the bus voltage transformer, the comparators U1, U2 and U3 correspondingly output low levels, the NOR gate U4 outputs high levels, the optocoupler G2 is powered off and cut off, the coil of the relay KA3 is not powered, the normally closed contact of the relay KA3 does not act, and the closed state is kept; meanwhile, when a certain three-phase or multiple phases of the voltage output terminal A, B, C of the relay protection tester are electrified, the voltage is reduced through the transformer T1, the transformer T2 or the transformer T3, the alternating current is converted into the direct current through the rectifier bridge D1, and the direct current is electrified and conducted through the resistor R1 and the optical coupler G1; the coil of relay KA1 is electrified, and the normally open contact action of relay KA1 is from the normally open state action for closed state, and relay protection tester voltage output terminal is connected with transformer substation protection measurement and control device voltage terminal row to the realization is ensured when transformer protection measurement and control device voltage terminal row A, B, C arbitrary looks all not communicate with bus voltage transformer secondary circuit, and when relay protection tester voltage output terminal A, B, C certain looks of three-phase or multi-phase was electrified, realizes the check-up.
In this embodiment, as shown in fig. 5, the starting circuit includes a button switch S1 and a relay KA2, one end of the button switch S1 is connected to the dc power supply, the other end of the button switch S1 is connected to one end of a coil of the relay KA2, the other end of the relay KA2 is grounded, and a normally open contact of the relay KA2 is disposed between a voltage terminal row of the substation protection measurement and control device and a connection line of a resistor R2, a resistor R3 and a resistor R4.
Through above-mentioned technical scheme, when start button switch S1 pressed, start button switch S1 normally open the node closure, relay KA2 coil is electrified, and relay KA2 normally open the node closure.
In this embodiment, the circuit further includes an alarm circuit a1, which is used for sending out warning information when a voltage terminal strip of the substation protection measurement and control device is communicated with a secondary circuit of a substation bus voltage transformer, and two ends of the alarm circuit a1 are connected in parallel with a coil of the relay KA 3. As shown in FIG. 3, the alarm is a conventional audible and visual alarm, and will not be described in detail herein. When opto-coupler G2 switched on, when transformer substation protected measurement and control device voltage terminal and bus voltage transformer secondary side return circuit intercommunication promptly, the alarm got to send audible and visual alarm for inform the present circuit situation of staff, thereby realize the information transfer of staff and circuit.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (6)
1. The utility model provides a circuit that electrified is responded to primary equipment when preventing transformer substation's protection measurement and control device debugging which characterized in that: the method comprises the following steps: the starting circuit, the detection circuit and the on-off control circuit;
the starting circuit is used for starting the detection circuit;
the detection circuit comprises a first detection circuit and a second detection circuit, the first detection circuit is used for detecting whether the output end of the relay protection tester is electrified or not and transmitting the information of whether the output end of the tester is electrified or not to the on-off control circuit, and the second detection circuit is used for detecting whether a secondary circuit of a bus voltage transformer of the transformer substation is communicated with a voltage terminal row of the transformer substation protection measurement and control device or not and transmitting the communication information to the on-off control circuit;
and the on-off control circuit is used for receiving the output information of the first detection circuit and the second detection circuit to control the on-off of the output voltage terminal of the relay protection tester and the voltage terminal row of the transformer substation protection measurement and control device.
2. The circuit for preventing the primary equipment from being electrified in an induction mode during debugging of the substation protection measurement and control device according to claim 1, is characterized in that: the first detection circuit comprises a transformer T1, a transformer T2, a transformer T3, a three-phase rectifier bridge D1, a resistor R1, a capacitor C1 and an optical coupler G1;
one end of the primary side of a transformer T1 is electrically connected with the phase A of the output end of the relay protection tester, the other end of the primary side of a transformer T1 is grounded, one end of the secondary side of a transformer T1 is connected with the phase A input end of a three-phase rectifier bridge D1, one end of the primary side of a transformer T2 is electrically connected with the phase B of the output end of the relay protection tester, the other end of the primary side of a transformer T2 is grounded, one end of the secondary side of a transformer T2 is connected with the phase B input end of the three-phase rectifier bridge D1, one end of the primary side of a transformer T3 is electrically connected with the phase C of the output end of the relay protection tester, the other end of the primary side of a transformer T3 is grounded, one end of the secondary side of a transformer T3 is connected with the phase C input end of the three-phase rectifier bridge D1, the other end of the, the positive output end of the rectifier bridge D1 is connected with one end of a capacitor C1, the other end of the capacitor C1 is grounded, one end of a resistor R1 is connected with a common connection point of the positive output ends of the capacitor C1 and the rectifier bridge D1, the other end of the resistor R1 is connected with the anode of a light-emitting diode of the optocoupler G1, the cathode of the light-emitting diode of the optocoupler G1 is grounded, the collector of a triode of the optocoupler G1 is connected with a direct current power supply, and the emitter of the triode of the optocoupler G1 is grounded.
3. The circuit for preventing the primary equipment from being electrified in an induction mode during debugging of the substation protection measurement and control device according to claim 1, is characterized in that: the second detection circuit comprises a resistor R2, a resistor R3, a resistor R4, an adjustable resistor R5, a resistor R6, a comparator U1, a comparator U2, a comparator U3, a NOR gate circuit U4 and an optical coupler G2;
one end of a resistor R2 is connected with a direct-current power supply, the other end of the resistor R2 is electrically connected with a phase A of a transformer substation protection and control device voltage terminal row, one end of a resistor R3 is connected with the direct-current power supply, the other end of a resistor R3 is electrically connected with a phase B of the transformer substation protection and control device voltage terminal row, one end of a resistor R4 is connected with the direct-current power supply, the other end of a resistor R4 is electrically connected with a phase C of the transformer substation protection and control device voltage terminal row, one end of an adjustable resistor R5 is connected with the direct-current power supply, the other end of an adjustable resistor R5 is grounded, a control end of the adjustable resistor is respectively connected with the same-phase ends of a comparator U1, a comparator U2 and a comparator U3, an inverting end of the comparator U1 is connected with a common connection point of the resistor R2 and the phase A, an inverting end of the comparator U2 is connected with a common connection point of the resistors R3 and the phase B, an inverting, the output ends of the comparator U1, the comparator U2 and the comparator U3 are connected with the input end of the NOR gate circuit U4, the output end of the NOR gate U4 is connected with the negative electrode of the light-emitting diode of the optocoupler G2, the positive electrode of the light-emitting diode of the optocoupler G2 is connected with a direct current power supply through a resistor R6, the collector electrode of the triode of the optocoupler G2 is connected with the direct current power supply, and the emitter electrode of the triode of the optocoupler G2 is grounded.
4. The circuit for preventing the primary equipment from being electrified in an induction mode during debugging of the substation protection measurement and control device according to claim 1, is characterized in that: the on-off control circuit comprises a relay KA1, a relay KA3 and a relay KA 4;
the normally open contact of relay KA4 is established ties with relay KA 3's normally closed contact, relay KA 4's normally open contact's the other end is connected with DC power supply, the one end and the DC power supply of relay KA 4's coil are connected, relay KA 4's the other end with the collecting electrode of first detection circuitry's opto-coupler G1's triode is connected, the one end and the DC power supply of relay KA3 coil are connected, the other end and the collecting electrode of second detection circuitry's opto-coupler G2's triode of relay KA3 are connected, relay KA 1's coil one end is connected with relay KA 3's normally closed contact's one end, the other end ground connection of relay KA 1's coil, relay KA 1's normally open contact's one end is connected with relay protection tester's output, relay KA 1's normally open contact's the other end and transformer substation protection.
5. The circuit for preventing the primary equipment from being electrified in an induction mode during debugging of the substation protection measurement and control device according to claim 1, is characterized in that: the starting circuit comprises a button switch S1 and a relay KA2, one end of the button switch S1 is connected with a direct-current power supply, the other end of the button switch S1 is connected with one end of a coil of the relay KA2, the other end of the relay KA2 is grounded, and a normally open contact of the relay KA2 is arranged between a voltage terminal bar of the transformer substation protection measurement and control device and a connecting line of a resistor R2, a resistor R3 and a resistor R4.
6. The circuit for preventing the primary equipment from being electrified in an induction mode during debugging of the substation protection measurement and control device according to claim 1, is characterized in that: the circuit further comprises an alarm circuit A1, wherein the alarm circuit A1 is used for sending out alarm information when a voltage terminal row of the transformer substation protection measurement and control device is communicated with a secondary circuit of a transformer substation bus voltage transformer, and two ends of the alarm circuit A1 are connected with coils of the relay KA3 in parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922121844.2U CN211530718U (en) | 2019-11-29 | 2019-11-29 | Circuit for preventing primary equipment from inducting electrification during debugging of transformer substation protection measurement and control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922121844.2U CN211530718U (en) | 2019-11-29 | 2019-11-29 | Circuit for preventing primary equipment from inducting electrification during debugging of transformer substation protection measurement and control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113917219A (en) * | 2021-10-08 | 2022-01-11 | 广东电网有限责任公司东莞供电局 | Automatic detection alarm device |
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2019
- 2019-11-29 CN CN201922121844.2U patent/CN211530718U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113917219A (en) * | 2021-10-08 | 2022-01-11 | 广东电网有限责任公司东莞供电局 | Automatic detection alarm device |
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