CN111381158A - Circuit breaker divide-shut brake coil real-time supervision device - Google Patents
Circuit breaker divide-shut brake coil real-time supervision device Download PDFInfo
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- CN111381158A CN111381158A CN202010387626.8A CN202010387626A CN111381158A CN 111381158 A CN111381158 A CN 111381158A CN 202010387626 A CN202010387626 A CN 202010387626A CN 111381158 A CN111381158 A CN 111381158A
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- 238000012544 monitoring process Methods 0.000 claims abstract description 115
- 238000002955 isolation Methods 0.000 claims abstract description 27
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- 238000010168 coupling process Methods 0.000 claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 238000012806 monitoring device Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000005070 sampling Methods 0.000 claims description 6
- 230000005465 channeling Effects 0.000 claims description 5
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 101100162020 Mesorhizobium japonicum (strain LMG 29417 / CECT 9101 / MAFF 303099) adc3 gene Proteins 0.000 claims description 2
- 101100434411 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ADH1 gene Proteins 0.000 claims description 2
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- 238000010586 diagram Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 3
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- 238000013461 design Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Abstract
The invention relates to an early warning method, in particular to a real-time monitoring device for a circuit breaker opening and closing coil. The circuit breaker opening and closing coil real-time monitoring device comprises a closing coil, an opening coil, a circuit breaker auxiliary contact and a direct-current voltage alternating-current entering monitoring part; a closing coil current monitoring branch is arranged beside the closing coil, and an opening coil current monitoring branch is arranged beside the opening coil; a controllable optical coupling relay contact connected with the breaker auxiliary contact in parallel is added on the breaker auxiliary contact; and earth direct current voltage and alternating current voltage measuring branches thereof are arranged on the sides of the positive bus and the negative bus. The device can effectively find the problems of poor contact, coil disconnection and the like of the opening and closing coil of the direct-current operating coil, eliminate the undervoltage interference of the auxiliary contact of the circuit breaker and the direct-current bus, and monitor the problem of alternating-current voltage entering; the isolation sensor is adopted to realize complete electrical isolation between the current monitoring branch circuit of the opening and closing coil and the opening and closing coil, the monitoring current is small, and the normal operation of a control main system of the circuit breaker cannot be influenced.
Description
Technical Field
The invention relates to an early warning method, in particular to a real-time monitoring device for a circuit breaker opening and closing coil.
Background
The defects of the relay protection circuit are one of the main reasons for fault amplification, and the incorrect protection action caused by the defects of the direct current operating coil accounts for a quite high proportion, wherein the direct current operating coil or an auxiliary contact of a circuit breaker is poor in contact, the coil is broken, direct current undervoltage and the like are important reasons for causing the incorrect protection action, so that effective monitoring and early warning on the direct current operating coil are important means for preventing hidden faults and reducing the incorrect protection action.
The conventional method for directly monitoring the traffic light coil or indirectly monitoring the normally closed contact string signal coil of the position relay belongs to non-full working condition monitoring, and the opening (closing) coil loses monitoring after the circuit breaker closes (opens) the brake. The comprehensive protection devices of most manufacturers have the monitoring and warning functions, but the research on the monitoring device for the all-working-condition of the opening and closing coil of the direct-current operating coil of the circuit breaker is not paid attention to, a few manufacturers which are deeply developed in the aspect are currently engaged in independently, and the potential safety hazard exists in the monitoring of the non-all-working-condition obviously. In order to solve the above problems, in order to ensure the smooth execution of eighteen countermeasures and prevent defective products from flowing into the power grid to operate, it is necessary to develop a monitoring device for a switching-on/off coil of a direct-current operating coil of a circuit breaker.
Disclosure of Invention
The invention aims to provide a real-time monitoring device for a switching-on and switching-off coil of a circuit breaker aiming at the defects, the current value flowing through the monitoring branch of the switching-on and switching-off coil is respectively monitored on line through the current branch of the switching-on and switching-off coil, whether the coil has the problem of disconnection is judged according to the comparison between the monitoring current and an early warning set value, and the interference of an auxiliary contact of the circuit breaker is eliminated by utilizing the switching of a controllable optical coupling relay contact, so that the monitoring of the integrity of the switching-; the method comprises the steps of monitoring direct current voltage of positive and negative buses to the ground, judging whether an undervoltage problem exists or not according to comparison between the monitored voltage and an early warning set value, eliminating undervoltage interference, and judging whether a bus Alternating Current (AC) channeling problem exists or not by monitoring a small AC signal of a DC circuit; the method can realize the complete working condition monitoring of the integrity of the direct current operating coil, has small monitoring current and strong anti-interference capability, and cannot influence the normal operation of the system.
The invention is realized by adopting the following technical scheme:
the circuit breaker opening and closing coil real-time monitoring device comprises a closing coil, an opening coil, a circuit breaker auxiliary contact and a direct-current voltage alternating-current entering monitoring part; a closing coil current monitoring branch is arranged beside the closing coil, and an opening coil current monitoring branch is arranged beside the opening coil; a controllable optical coupling relay contact connected with the breaker auxiliary contact in parallel is added on the breaker auxiliary contact; and earth direct current voltage and alternating current voltage measuring branches thereof are arranged on the sides of the positive bus and the negative bus.
The current monitoring branch circuit of the closing coil comprises a current limiting resistor of the monitoring branch circuit of the closing coil, a current measuring resistor of the monitoring branch circuit of the closing coil and a first isolation sensor thereof, a normally open auxiliary contact of a first breaker and a positive end connecting point of the closing coil which are sequentially connected;
the opening coil current monitoring branch comprises a current limiting resistor of an opening coil monitoring branch, a current measuring resistor of the opening coil monitoring branch and a second isolation sensor thereof, a normally closed auxiliary contact of a first circuit breaker and a positive end connecting point of an opening coil which are connected in sequence;
the first isolation sensor and the second isolation sensor respectively monitor voltage drops on the current measuring resistor of the closing coil monitoring branch circuit and the current measuring resistor of the opening coil monitoring branch circuit.
Two ends of a normally open auxiliary contact of a first breaker of the switching-on coil current monitoring branch circuit are connected with a contact of a first optical coupling relay in parallel; and two ends of a normally closed auxiliary contact of a first breaker of the opening coil current monitoring branch circuit are connected with a second optical coupling relay contact in parallel.
In the direct current voltage and alternating current component monitoring circuit of the positive bus and the negative bus to the ground, the positive bus passes through a third isolation sensor PTPObtaining a voltage measuring resistor (i.e. a third voltage dividing measuring resistor) R of the direct current positive bus voltage monitoring branch circuitPPUpper voltage drop, negative bus passing through a fourth isolated sensor PTNObtaining the voltage measuring resistor (i.e. the fourth voltage measuring resistor) R of the DC negative bus voltage monitoring branch circuitPNPressure drop over the pressure drop.
The current of the branch circuit is monitored by measuring the current of the closing coil and the opening coil and is respectively compared with the preset value, so that whether the closing coil and the opening coil have the problem of circuit breaking can be judged, and whether the interference of the auxiliary contact of the circuit breaker is caused can be judged simultaneously by switching the optical coupling relay connected with the auxiliary contact of the circuit breaker in parallel; bus voltage interference of the opening and closing coils can be judged by monitoring direct current voltage of the positive bus and the negative bus, and meanwhile, the problem of alternating current channeling of the positive bus and the negative bus can be monitored by monitoring alternating current component of the monitor.
The device of the invention has reasonable design and scientific structure, and has the following advantages:
1) the monitoring sensitivity is high, the problems of poor contact, coil disconnection and the like of the opening and closing coil of the direct-current operating coil can be effectively found, and meanwhile, the problems of low-voltage interference of an auxiliary contact of the circuit breaker and a direct-current bus and the problem of alternating-current voltage channeling can be solved.
2) The isolation sensor is adopted to realize complete electrical isolation between the current monitoring branch circuit of the opening and closing coil and the opening and closing coil, the monitoring current is small, the normal operation of a control main system of the circuit breaker cannot be influenced, and the circuit breaker is high in precision, quick in response and small in size.
Drawings
FIG. 1 is a circuit diagram of a current monitoring branch of a closing coil in the apparatus of the present invention;
FIG. 2 is a circuit diagram of a shunt coil current monitoring branch in the apparatus of the present invention;
FIG. 3 is a schematic diagram of a closing coil current monitoring circuit of the apparatus of the present invention;
FIG. 4 is a schematic diagram of a current monitoring circuit for the opening coil of the apparatus of the present invention;
FIG. 5 is a logic diagram for determining the disconnection of the closing coil of the apparatus of the present invention;
FIG. 6 is a logic diagram for determining the disconnection of the switching-off coil of the device of the present invention;
fig. 7 is a block diagram of the dc voltage and ac ingress monitoring branch of the apparatus of the present invention.
In fig. 1 and 3:
RLHindicating a current limiting resistor of a monitoring branch of a closing coil;
RCHthe current measuring resistor of the monitoring branch circuit of the indicating closing coil;
CTHa current measuring sensor, namely a first isolation sensor, of the monitoring branch of the indicating closing coil;
OPHthe method comprises the steps that contacts are connected in parallel at two ends of a normally open auxiliary contact of a first breaker of a monitoring branch circuit of a closing coil, namely a first optical coupling relay contact;
in fig. 2 and 4:
RLTrepresenting the current limiting resistance of the monitoring branch of the opening coil;
RCTrepresenting the current measuring resistance of the monitoring branch of the opening coil;
CTTa second isolation sensor which is a monitoring branch current measuring sensor of the switching-off coil;
OPTthe two ends of a normally closed auxiliary contact of a first breaker of the breaking coil monitoring branch circuit are connected with contacts in parallel, namely a second optical coupling relay contact;
in fig. 7:
RLPthe voltage-dividing resistor of the monitoring branch circuit of the direct-current positive bus voltage is represented;
RPPthe voltage measuring resistor represents the voltage monitoring branch of the direct current positive bus;
PTPa third isolation sensor, representing a dc positive bus voltage monitoring branch voltage measurement sensor;
RLNthe voltage dividing resistor represents a direct current negative bus voltage monitoring branch circuit;
RPNthe voltage measuring resistor represents the voltage of the direct-current negative bus voltage monitoring branch circuit;
PTNa voltage measuring sensor, namely a fourth isolation sensor, representing the voltage monitoring branch of the direct-current negative bus;
in addition:
DSP stands for digital signal processor;
ADCs 1 to 4 represent analog-to-digital converters;
other symbols are common symbols of the circuit breaker operation circuit and are not described.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a real-time monitoring device for a switching-on and switching-off coil of a circuit breaker, which is characterized in that current monitoring branches are respectively added to a conventional switching-on coil and a conventional switching-off coil; an optical coupling relay contact connected with the auxiliary contact in parallel is added in the current monitoring branch of the closing coil and the opening coil respectively; and a direct current voltage and alternating current component monitoring branch circuit of the positive bus and the negative bus to the ground is added.
The current monitoring branch of the switching-on coil comprises a current limiting resistor R of the switching-on current monitoring branch which are connected in sequenceLHCurrent measuring resistor R of monitoring branch circuit of closing coilCHAnd its first isolation sensor CTHThe positive end connecting point of the normally open auxiliary contact of the first circuit breaker and the closing coil;
the current monitoring branch of the opening coil comprises current limiting resistors R of opening current monitoring branches which are sequentially connectedLTShunt coil monitoring branch current measuring resistorRCTAnd its second isolation sensor CTTThe positive end connecting point of the normally closed auxiliary contact and the opening coil of the first circuit breaker;
first isolation sensor CTHAnd a second isolation sensor CTTAre respectively used for monitoring current measuring resistors R of a closing coil monitoring branchCHAnd the opening coil monitors the branch current and measures the resistance RCTPressure drop over the pressure drop.
The two ends of the normally open auxiliary contact of the first breaker of the closing coil current monitoring branch circuit and the contact OP of the first optical coupling relayHAre connected in parallel; the two ends of the normally closed auxiliary contact of the first breaker of the opening coil current monitoring branch circuit and the contact OP of the second optical coupling relayTAre connected in parallel.
In the direct current voltage and alternating current component monitoring circuit of the positive bus and the negative bus to the ground, the positive bus passes through a third isolation sensor PTPObtaining a third voltage-dividing measuring resistance (DC positive bus voltage monitoring branch voltage measuring resistance R)PP) Upper voltage drop, negative bus passing through a fourth isolated sensor PTNObtaining a fourth voltage-dividing measuring resistor (DC negative bus voltage monitoring branch voltage measuring resistor R)PN) Pressure drop over the pressure drop.
The invention can judge whether the switching-on coil and the switching-off coil have the problem of circuit breaking or not by measuring the current of the current monitoring branch of the switching-on coil and the switching-off coil and comparing the measured current with the preset value respectively, and simultaneously judge whether the current is the interference of the auxiliary contact of the circuit breaker or not by switching the optical coupling relay which is connected with the auxiliary contact of the circuit breaker in parallel.
Bus voltage interference of the opening and closing coils can be judged by monitoring direct current voltage of the positive bus and the negative bus, and meanwhile, the problem of alternating current channeling of the positive bus and the negative bus can be monitored by monitoring alternating current component of the monitor.
The current monitoring process of the closing coil is shown in fig. 1, and comprises the following steps:
the branch starts from the positive bus connecting point, and the current limiting resistor R of the branch is monitored through a closing coilLHThen sampling the current measuring resistor R of the closing coil monitoring branch circuitCHThe first breaker normally open auxiliary contact QF3Closing lineThe positive end of the loop is connected. The circuit does not need to change other control coil branches of the original comprehensive protection, and only needs to reserve a positive bus connecting point, a positive end connecting point of a closing coil and a normally-open auxiliary contact QF of a circuit breaker3. Fig. 3 is a specific circuit implementation diagram of the above circuit, a voltage within 200mV is obtained by sampling the resistance, and the voltage is sent to an ADC1 interface of a DSP (digital signal processor) through a first isolation sensor and a corresponding conditioning circuit, and the DSP converts the collected data into a corresponding actual current value. The current flowing through the actual circuit is about 10mA, so that whether the open circuit phenomenon exists or not can be preliminarily judged by comparing the acquired current value with the early warning set value of 8 mA. In addition, the device is arranged at the normally open auxiliary contact QF of the circuit breaker3The two ends of the optical coupling normally open relay contact are connected in parallel, after the monitored value of the collected current is smaller than the early warning set value of 8mA, the DSP starts a corresponding IO1 outlet to close the optical coupling normally open relay contact, and if the monitored value of the collected current is still smaller than the early warning set value of 8mA within a short period of time, the existence of an open circuit phenomenon can be basically judged. The specific early warning logic is shown in fig. 5, and through the AND operation, the interference of the normally open auxiliary contact and the direct-current voltage can be eliminated, and the situation that the normally open auxiliary contact is not in place can be monitored.
The current monitoring process of the opening coil is shown in fig. 2, and comprises the following steps:
the branch starts from the positive bus connection point and firstly passes through a current limiting resistor RLTThen sampling the resistor RCTSecond breaker normally open auxiliary contact QF4And the positive end of the opening coil is connected with the point. The specific execution circuit and process are the same as the current monitoring of the closing coil, and are shown in detail in fig. 4, and the corresponding specific early warning logic is shown in fig. 6.
The circuit principle of the alternating current entering early warning is shown in figure 7, and a positive and negative bus divider resistor (direct current positive bus voltage monitoring branch voltage measuring resistor) RPP(DC negative bus voltage monitoring branch voltage measuring resistance) RPNThe voltages on the transformer are respectively sent to ADC3 and ADC4 of DSP (digital signal processor) after passing through respective isolation sensor and conditioning circuit, finally corresponding alternating voltage values are obtained after FFT calculation of DSP,and comparing with the set reference value, if any one side or both sides are greater than the set reference value (10V), judging that the positive and negative buses have the problem of alternating current entering, and immediately reporting an early warning signal. In addition, the branch circuit also needs to take a corresponding direct current voltage value, and compares the direct current voltage value with a direct current voltage under-voltage reference value (80%. 220V or 80%. 110V), so as to participate in the logic judgment of the figures 5 and 6, and avoid the error alarm of the switching-on and switching-off coil caused by under-voltage.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person of ordinary skill in the art can make modifications or equivalents to the specific embodiments of the present invention with reference to the above embodiments, and such modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as set forth in the claims.
Claims (10)
1. The utility model provides a circuit breaker divide-shut brake coil real-time supervision device which characterized in that: the circuit breaker comprises a closing coil, an opening coil, a breaker auxiliary contact and a direct-current voltage alternating-current entering monitoring part; a closing coil current monitoring branch is arranged beside the closing coil, and an opening coil current monitoring branch is arranged beside the opening coil; a controllable optical coupling relay contact connected with the breaker auxiliary contact in parallel is added on the breaker auxiliary contact; and earth direct current voltage and alternating current voltage measuring branches thereof are arranged on the sides of the positive bus and the negative bus.
2. The circuit breaker opening and closing coil real-time monitoring device according to claim 1, characterized in that: the current monitoring branch circuit of the closing coil comprises a current limiting resistor of the monitoring branch circuit of the closing coil, a current measuring resistor of the monitoring branch circuit of the closing coil, a first isolation sensor of the current measuring resistor, a normally open auxiliary contact of a first breaker and a positive end connecting point of the closing coil which are sequentially connected.
3. The circuit breaker opening and closing coil real-time monitoring device according to claim 2, characterized in that: the opening coil current monitoring branch comprises a current limiting resistor of an opening coil monitoring branch, a current measuring resistor of the opening coil monitoring branch and a second isolation sensor thereof, a normally closed auxiliary contact of a first circuit breaker and a positive end connecting point of an opening coil which are connected in sequence;
the first isolation sensor and the second isolation sensor respectively monitor voltage drops on the current measuring resistor of the closing coil monitoring branch circuit and the current measuring resistor of the opening coil monitoring branch circuit.
4. The circuit breaker opening and closing coil real-time monitoring device according to claim 3, characterized in that: two ends of a normally open auxiliary contact of a first breaker of the switching-on coil current monitoring branch circuit are connected with a contact of a first optical coupling relay in parallel; and two ends of a normally closed auxiliary contact of a first breaker of the opening coil current monitoring branch circuit are connected with a second optical coupling relay contact in parallel.
5. The circuit breaker opening and closing coil real-time monitoring device according to claim 4, wherein: in the direct current voltage and alternating current component monitoring circuit of the positive bus and the negative bus to the ground, the positive bus passes through a third isolation sensor PTPVoltage measuring resistor R for acquiring direct-current positive bus voltage monitoring branch circuitPPUpper voltage drop, negative bus passing through a fourth isolated sensor PTNMeasuring resistor R for acquiring voltage of monitoring branch circuit of direct-current negative busPNPressure drop over the pressure drop.
6. The monitoring method of the circuit breaker opening and closing coil real-time monitoring device according to claim 1, characterized in that: the current of a current monitoring branch of a closing coil and a current monitoring branch of an opening coil are measured and compared with preset values respectively, whether the closing coil and the opening coil have the problem of circuit breaking is judged, and whether the interference of an auxiliary contact of a circuit breaker is judged by switching an optical coupling relay connected with the auxiliary contact of the circuit breaker in parallel;
bus voltage interference of the switching-on and switching-off coils is judged by monitoring direct current voltage of the positive bus and the negative bus, and meanwhile, alternating current channeling of the positive bus and the negative bus is monitored by monitoring alternating current components of the monitor.
7. The monitoring method of the real-time monitoring device for the opening and closing coils of the circuit breaker according to claim 6, wherein the current monitoring process of the closing coils comprises the following steps:
(1) the branch starts from the positive bus connecting point, and the current limiting resistor R of the branch is monitored through a closing coilLHThen sampling the current measuring resistor R of the closing coil monitoring branch circuitCHThe first breaker normally open auxiliary contact QF3The positive end connecting point of the closing coil; the circuit does not need to change other control coil branches of the original comprehensive protection, and only needs to reserve a positive bus connecting point, a positive end connecting point of a closing coil and a normally-open auxiliary contact QF of a circuit breaker3；
(2) The sampling resistor is divided into voltages within 200mV and is sent to an ADC1 interface of the DSP digital signal processor through the first isolation sensor and the corresponding conditioning circuit, and the DSP converts the acquired data into corresponding actual current values; the current flowing through the actual circuit is about 10mA, and whether the open circuit phenomenon exists can be preliminarily judged by comparing the collected current numerical value with the early warning set value of 8 mA;
(3) the device is at circuit breaker normally open auxiliary contact QF3The two ends of the optical coupling normally open relay contact are connected in parallel, after the monitored value of the collected current is smaller than the early warning set value of 8mA, the DSP starts a corresponding IO1 outlet to close the optical coupling normally open relay contact, and if the monitored value of the collected current is still smaller than the early warning set value of 8mA within a short period of time, the phenomenon of circuit break is basically judged;
through and operation, the interference of the normally open auxiliary contact and direct current voltage can be eliminated, and the condition that the normally open auxiliary contact is not in place can be monitored.
8. The monitoring method of the real-time monitoring device for the opening and closing coils of the circuit breaker according to claim 6, wherein the current monitoring process of the opening coils comprises the following steps:
(1) the branch starts from the positive bus connection point and firstly passes through a current limiting resistor RLTThen sampling the resistor RCTSecond breaker normally open auxiliary contact QF4The positive end connecting point of the opening coil; the specific execution circuit and the specific execution process are the same as the current monitoring of the closing coil;
(2) positive and negative bus divider resistor RPPNamely a direct current positive bus voltage monitoring branch voltage measuring resistor and a direct current negative bus voltage monitoring branch voltage measuring resistor RPNThe voltages on the bus are respectively transmitted into an ADC3 and an ADC4 of a DSP digital signal processor after passing through respective isolation sensors and conditioning circuits, finally, after FFT calculation of the DSP, a corresponding alternating current voltage value is obtained and compared with a set reference value, if any one side or both sides of the alternating current voltage value are larger than the set reference value, the fact that alternating current flees into the positive bus or the negative bus is judged, and an early warning signal is reported immediately.
9. The monitoring method for the circuit breaker opening and closing coil real-time monitoring device according to claim 8, wherein the set reference value is 10V.
10. The monitoring method of the real-time monitoring device for the opening and closing coils of the circuit breaker according to claim 8, wherein the branch circuit further requires a corresponding direct-current voltage value, compares the direct-current voltage value with a direct-current voltage under-voltage reference value, and avoids false alarm of the opening and closing coils caused by under-voltage through logic judgment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010387626.8A CN111381158A (en) | 2020-05-09 | 2020-05-09 | Circuit breaker divide-shut brake coil real-time supervision device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010387626.8A CN111381158A (en) | 2020-05-09 | 2020-05-09 | Circuit breaker divide-shut brake coil real-time supervision device |
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| CN111381158A true CN111381158A (en) | 2020-07-07 |
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| CN202010387626.8A Pending CN111381158A (en) | 2020-05-09 | 2020-05-09 | Circuit breaker divide-shut brake coil real-time supervision device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112259415A (en) * | 2020-09-29 | 2021-01-22 | 许继集团有限公司 | Jump position monitoring circuit for relieving circuit heating by utilizing relay switching |
| CN112394283A (en) * | 2020-12-09 | 2021-02-23 | 广东电网有限责任公司 | Detection apparatus for direct current female gang switch closing state and electric power system |
| CN112750638A (en) * | 2020-12-31 | 2021-05-04 | 江苏韬博智能科技有限公司 | Judging device for on-off state of breaker on-off mechanical contact and working method |
| CN113092997A (en) * | 2021-03-29 | 2021-07-09 | 南方电网数字电网研究院有限公司 | Circuit breaker monitoring circuit and low-voltage protection device |
| CN114217218A (en) * | 2021-12-15 | 2022-03-22 | 宿迁阳光送变电工程有限公司 | Circuit breaker switch tripping and operation loop real-time monitoring device |
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2020
- 2020-05-09 CN CN202010387626.8A patent/CN111381158A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112259415A (en) * | 2020-09-29 | 2021-01-22 | 许继集团有限公司 | Jump position monitoring circuit for relieving circuit heating by utilizing relay switching |
| CN112394283A (en) * | 2020-12-09 | 2021-02-23 | 广东电网有限责任公司 | Detection apparatus for direct current female gang switch closing state and electric power system |
| CN112394283B (en) * | 2020-12-09 | 2022-07-29 | 广东电网有限责任公司 | Detection apparatus for direct current female gang switch closing state and electric power system |
| CN112750638A (en) * | 2020-12-31 | 2021-05-04 | 江苏韬博智能科技有限公司 | Judging device for on-off state of breaker on-off mechanical contact and working method |
| CN113092997A (en) * | 2021-03-29 | 2021-07-09 | 南方电网数字电网研究院有限公司 | Circuit breaker monitoring circuit and low-voltage protection device |
| CN114217218A (en) * | 2021-12-15 | 2022-03-22 | 宿迁阳光送变电工程有限公司 | Circuit breaker switch tripping and operation loop real-time monitoring device |
| CN114217218B (en) * | 2021-12-15 | 2024-02-13 | 宿迁阳光送变电工程有限公司 | Real-time monitoring device for switch stealing and tripping and operation loop of circuit breaker |
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