CN117650491A - Optimization method for preventing misoperation of direct current system operation loop - Google Patents
Optimization method for preventing misoperation of direct current system operation loop Download PDFInfo
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- CN117650491A CN117650491A CN202410077803.0A CN202410077803A CN117650491A CN 117650491 A CN117650491 A CN 117650491A CN 202410077803 A CN202410077803 A CN 202410077803A CN 117650491 A CN117650491 A CN 117650491A
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Abstract
The invention relates to the technical field of relay protection, and provides an optimization method for preventing misoperation of an operation loop of a direct current system, wherein the operation loop comprises a closing loop and a tripping loop, and the method comprises the following steps: extracting a closing hold relay, a tripping hold relay, an automatic closing contact, an automatic tripping contact, a manual closing contact and a manual tripping contact in an operation loop; after the extracted automatic closing contact and manual closing contact are connected in parallel, and the automatic tripping contact and manual tripping contact are connected in parallel, one end of the automatic closing contact and the manual tripping contact are respectively connected in series with a normally closed auxiliary node of the circuit breaker or a normally open auxiliary node of the circuit breaker, a closing holding relay or a tripping holding relay and a voltage dividing resistor in sequence, so that a new circuit is constructed; and connecting the newly constructed circuit head and tail to the anode and the cathode of the bus respectively. According to the invention, on the basis of the original operation loop, one open loop is added for setting the action threshold of the operation loop, so that misoperation of the operation loop is prevented.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to an optimization method for preventing misoperation of an operation loop of a direct current system.
Background
The dc system operating loop acts as an outlet loop for controlling the operation of the primary device, and strict requirements are placed on the reliability thereof. In order to avoid disturbances of the operating circuit by the dc system ground, the important outlet circuit of the dc system operating circuit generally requires that it be reliably deactivated below 55% of the rated voltage and reliably activated above 70% of the rated voltage. However, the tripping and closing circuit in the operation circuit requires that the tripping and closing current is not more than 50% of the rated action current due to the special requirement of the sensitivity, which results in that the tripping and closing current reaches 50% to exceed the tripping and closing holding relay action current in the case of direct current single point grounding at an outlet pressing plate in extreme cases, thereby causing misoperation of primary equipment.
Disclosure of Invention
The invention aims to solve at least one technical problem in the background art and provides an optimization method for preventing misoperation of a direct current system operation loop.
In order to achieve the above object, the present invention provides an optimization method for preventing malfunction of an operation circuit of a direct current system, wherein the operation circuit includes a closing circuit and a tripping circuit, and the method includes:
extracting a closing hold relay, a tripping hold relay, an automatic closing contact, an automatic tripping contact, a manual closing contact and a manual tripping contact in an operation loop;
after the extracted automatic closing contact and manual closing contact are connected in parallel, and the automatic tripping contact and manual tripping contact are connected in parallel, one end of the automatic closing contact and the manual tripping contact are respectively connected in series with a normally closed auxiliary node of the circuit breaker or a normally open auxiliary node of the circuit breaker, a closing holding relay or a tripping holding relay and a voltage dividing resistor in sequence, so that a new circuit is constructed;
and connecting the head and the tail of the constructed new circuit into the anode and the cathode of the bus respectively.
According to one aspect of the invention, the closing loop comprises a normally open contact of a closing holding relay, an anti-tripping relay contact, a normally closed auxiliary node of a first circuit breaker, a closing coil, a tripping position relay, a manual closing contact, an automatic closing contact, a normally closed auxiliary node of a second circuit breaker, a closing holding relay and a first voltage dividing resistor;
the normally open contact of the closing holding relay is connected in series with the anti-tripping relay contact, then connected in parallel with the tripping position relay, and then connected in series with a normally closed auxiliary node of the first circuit breaker and a closing coil in sequence; the two ends of the circuit are respectively connected with the anode and the cathode of the direct current power supply;
the manual closing contact is connected with the automatic closing contact in parallel, and then is connected with a normally closed auxiliary node of the second circuit breaker, a closing holding relay and a first voltage dividing resistor in series in sequence; the two ends of the circuit are respectively connected with the anode and the cathode of the direct current power supply.
According to one aspect of the invention, the trip circuit comprises a trip hold relay normally open contact, a first breaker normally open auxiliary node, a trip coil, a closing position relay, a manual trip contact, an automatic trip contact, a second breaker normally open auxiliary node, a trip hold relay, and a second voltage divider resistor;
the normally open contact of the tripping maintaining relay is connected in parallel with the tripping position relay, and then a normally open auxiliary node of the first circuit breaker and a tripping coil are sequentially connected in series; the two ends of the circuit are respectively connected with the anode and the cathode of the direct current power supply;
the manual tripping contact is connected with the automatic tripping contact in parallel and then is connected with a normally open auxiliary node of the second circuit breaker, a tripping hold relay and a second voltage dividing resistor in series in sequence; the two ends of the circuit are respectively connected with the anode and the cathode of the direct current power supply.
According to one aspect of the invention, the switching-on loop is set by the action threshold through the first voltage dividing resistor and the switching-on holding relay, so that the switching-on loop reliably does not act on the switching-on holding relay under the condition that the rated voltage is applied by 55%, and the switching-on loop reliably acts on the switching-on holding relay over the rated voltage which is applied by 70%.
According to one aspect of the invention, the trip circuit is provided with an action threshold through the second voltage dividing resistor and the trip holding relay, so that the trip circuit reliably does not act under the condition that the rated voltage is applied by 55%, and the trip circuit reliably acts above the rated voltage which is applied by 70%.
According to an aspect of the present invention, the closing hold relay and the trip hold relay are voltage type relays.
According to one aspect of the invention, when the switching-on loop performs action threshold setting through the first voltage dividing resistor and the switching-on holding relay, the following conditions are satisfied:
the closing hold relay is reliable and does not act;
the switching-on maintaining relay reliably acts;
wherein R1 represents the resistance value of the first voltage dividing resistor, rh represents the internal resistance of the closing holding relay, un represents the rated voltage of the direct-current operation loop, and Uh represents the voltage on the closing holding relay.
According to one aspect of the invention, when the trip circuit performs action threshold setting through the second voltage dividing resistor and the trip holding relay, the following conditions are satisfied:
the tripping keeps the relay reliable and non-action;
the trip keeps the relay reliably acting;
wherein R2 represents the resistance value of the second voltage dividing resistor, rt represents the internal resistance of the trip holding relay, un represents the rated voltage of the direct current operation loop, and Ut represents the voltage on the trip holding relay.
According to one aspect of the invention, when the circuit breaker is in a tripping position, a normally closed auxiliary node of the first circuit breaker and a normally closed auxiliary node of the second circuit breaker are in a closed state, when a closing command is sent by a protection device, an automatic closing contact is closed, a first loop is formed by a positive power supply, the automatic closing contact, the normally closed auxiliary node of the second circuit breaker, a closing holding relay, a first voltage dividing resistor and a negative power supply, at the moment, the closing holding relay is electrified, and then the normally open contact of the closing holding relay is closed, and a second loop is formed by the positive power supply, the normally open contact of the closing holding relay, an anti-tripping relay contact, the normally closed auxiliary node of the first circuit breaker, a closing coil and the negative power supply, the closing coil is electrified, and the circuit breaker is closed;
after the circuit breaker finishes the closing action, the normally closed auxiliary node of the first circuit breaker and the normally closed auxiliary node of the second circuit breaker are disconnected, the first circuit and the second circuit are both powered off and wait for tripping and resetting, and the two-circuit cutting-off power supply is respectively completed by the normally closed auxiliary node of the first circuit breaker and the normally closed auxiliary node of the second circuit breaker.
According to one aspect of the invention, when the circuit breaker is in a closing position, the first normally open auxiliary node and the second normally open auxiliary node of the circuit breaker are in a closing state, when a tripping command is sent out by the protection device, an automatic tripping contact is closed, a third loop is formed by a positive power supply, the automatic tripping contact, the second normally open auxiliary node of the circuit breaker, a tripping hold relay, a second voltage dividing resistor and a negative power supply, at the moment, the tripping hold relay is electrified, and then the normally open contact of the tripping hold relay is closed, a fourth loop is formed by the positive power supply, the normally open contact of the tripping hold relay, the first normally open auxiliary node of the circuit breaker, the tripping coil and the negative power supply, and the tripping coil is electrified, so that the circuit breaker trips;
after the circuit breaker finishes tripping action, the normally open auxiliary node of the first circuit breaker is disconnected with the normally open auxiliary node of the second circuit breaker, the third circuit and the fourth circuit are all powered off and wait for closing and resetting, and the two-circuit power-off is respectively completed by the normally open auxiliary node of the first circuit breaker and the normally open auxiliary node of the second circuit breaker.
According to the scheme of the invention, the invention is modified on the basis of the original relay protection direct current operation loop, and one open-in loop is added for setting the action threshold of the operation loop, so that the misoperation of the operation loop is prevented, the auxiliary contacts of the relay are fully and reasonably utilized, the risk of arc discharge damage of the modified operation loop is prevented, the reliability of the original operation loop is increased, the misoperation under the conditions of hardware fault, direct current single-point grounding at the outlet pressing plate and the like is prevented, and meanwhile, the technical route of the original traditional open-in loop is adopted, so that the device selection and actual application in the later stage are facilitated.
Drawings
FIG. 1 schematically illustrates a flow chart of an optimization method for preventing malfunction of a DC system operating loop in accordance with one embodiment of the present invention;
fig. 2 schematically shows a ground diagram of a closing circuit at an outlet hold-down plate according to an embodiment of the invention;
fig. 3 schematically illustrates a trip circuit ground map at an outlet pressure plate in accordance with one embodiment of the present invention;
FIG. 4 schematically illustrates a grounding diagram of a closing circuit at an outlet pressure plate in a conventional approach;
fig. 5 schematically illustrates a ground map of the trip circuit at the outlet hold-down in a conventional approach.
Detailed Description
The present disclosure will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are merely to enable those of ordinary skill in the art to better understand and thus practice the teachings of the present invention and do not imply any limitation on the scope of the invention.
As used herein, the term "comprising" and variants thereof are to be interpreted as meaning "including but not limited to" open-ended terms. The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment.
Fig. 1 schematically shows a flow chart of an optimization method for preventing malfunction of an operating loop of a direct current system according to an embodiment of the invention. As shown in fig. 1, in the present embodiment, an optimization method for preventing malfunction of an operation circuit of a direct current system, where the operation circuit includes a closing circuit and a tripping circuit, specifically, the method includes:
a. extracting a closing hold relay, a tripping hold relay, an automatic closing contact, an automatic tripping contact, a manual closing contact and a manual tripping contact in an operation loop;
b. after the extracted automatic closing contact and manual closing contact are connected in parallel, and the automatic tripping contact and manual tripping contact are connected in parallel, one end of the automatic closing contact and the manual tripping contact are respectively connected in series with a normally closed auxiliary node of the circuit breaker or a normally open auxiliary node of the circuit breaker, a closing holding relay or a tripping holding relay and a voltage dividing resistor in sequence, so that a new circuit is constructed;
c. and connecting the head and the tail of the constructed new circuit into the anode and the cathode of the bus respectively.
The voltage dividing resistor is used for being matched with the relay to ensure that the relay is reliably not operated below 55% of rated voltage and the relay is reliably operated above 70% of rated voltage.
According to the scheme of the invention, on the basis of the original operation loop, one open loop is added for setting the action threshold of the operation loop, so that misoperation of the operation loop is prevented; the method not only increases the reliability of the operation loop, but also facilitates the later device model selection and practical application by adopting the original technical route of the traditional open loop.
Further, fig. 2 schematically shows a map of the closing circuit at the outlet pressure plate according to an embodiment of the invention. As shown in fig. 2, in the present embodiment, the closing circuit includes a closing holding relay normally open contact HBJ1, an anti-trip relay contact TBJV, a first breaker normally closed auxiliary node QF1, a closing coil HQ, a trip position relay TWJ, a manual closing contact SHJ, an automatic closing contact ZHJ, a second breaker normally closed auxiliary node QF2, a closing holding relay HBJ, and a first voltage dividing resistor R;
in the embodiment, after a normally open contact HBJ1 of a closing hold relay and a tripping-prevention relay contact TBJV are connected in series, the normally open contact HBJ1 and the tripping-prevention relay contact TBJV are connected in parallel with a tripping position relay TWJ, and then a normally closed auxiliary node QF1 of a first circuit breaker and a closing coil HQ are connected in series in sequence; the two ends of the circuit are respectively connected with the anode and the cathode of the direct current power supply;
the manual closing contact SHJ and the automatic closing contact ZHJ are connected in parallel, and then are connected in series with a normally closed auxiliary node QF2 of the second circuit breaker, a closing holding relay HBJ and a first voltage dividing resistor R in sequence; the two ends of the circuit are respectively connected with the anode and the cathode of the direct current power supply.
Further, fig. 3 schematically illustrates a trip circuit ground map at the outlet platen according to one embodiment of the present invention. As shown in fig. 3, in the present embodiment, the trip circuit includes a trip hold relay normally open contact TBJ1, a first breaker normally open auxiliary node QF3, a trip coil TQ, a closing position relay HWJ, a manual trip contact STJ, an automatic trip contact ZTJ, a second breaker normally open auxiliary node QF4, a trip hold relay TBJ, and a second voltage divider resistor r;
in the present embodiment, the trip hold relay normally open contact TBJ1 is connected in parallel with the trip position relay TWJ, and then sequentially connected in series with the first breaker normally open auxiliary node QF3 and the trip coil TQ; the two ends of the circuit are respectively connected with the anode and the cathode of the direct current power supply;
the manual trip contact STJ and the automatic trip contact ZTJ are connected in parallel and then are connected in series with a normally open auxiliary node QF4 of the second circuit breaker, a trip holding relay TBJ and a second voltage dividing resistor r in sequence; the two ends of the circuit are respectively connected with the anode and the cathode of the direct current power supply.
In this embodiment, the switching-on circuit performs the operation threshold setting through the first voltage dividing resistor R and the switching-on holding relay HBJ, so that the switching-on circuit is ensured to reliably not operate under the rated voltage of 55% and the switching-on holding relay HBJ is ensured to reliably operate over the rated voltage of 70%.
In the present embodiment, the trip circuit is provided with an operation threshold by the second voltage dividing resistor r and the trip holding relay TBJ, so that the trip circuit reliably does not operate the trip holding relay TBJ when the rated voltage of 55% or less is applied, and the trip circuit reliably operates the trip holding relay TBJ when the rated voltage of 70% or more is applied.
In the present embodiment, the closing holding relay HBJ and the trip holding relay TBJ are voltage type relays.
Further, in this embodiment, when the switching-on loop performs the operation threshold setting through the first voltage dividing resistor R and the switching-on holding relay HBJ, it satisfies the following conditions:
the closing holding relay HBJ is reliable and does not act;
the switching-on holding relay HBJ reliably acts;
wherein, R1 represents the resistance value of the first voltage dividing resistor R, rh represents the internal resistance of the closing holding relay HBJ, un represents the rated voltage of the direct current operation loop, and Uh represents the voltage on the closing holding relay HBJ.
Further, in the present embodiment, when the trip circuit is set to the operation threshold by the second voltage dividing resistor r and the trip hold relay TBJ, the following conditions are satisfied:
the tripping keeps the relay reliable and non-action;
the trip keeps the relay reliably acting;
where R2 represents the resistance of the second voltage dividing resistor R, rt represents the internal resistance of the trip hold relay TBJ, un represents the dc operating loop rated voltage, and Ut represents the voltage across the trip hold relay TBJ.
Further, in this embodiment, when the circuit breaker is in the trip position, the first circuit breaker normally-closed auxiliary node QF1 and the second circuit breaker normally-closed auxiliary node QF2 are in the closed state, and when the protection device issues a closing command, the automatic closing contact ZHJ is closed, and a first loop is formed by the positive power supply, the automatic closing contact ZHJ, the second circuit breaker normally-closed auxiliary node QF2, the closing holding relay HBJ, the first voltage dividing resistor R and the negative power supply, at this time, the closing holding relay HBJ is powered on;
the normally open contact HBJ1 of the switching-on hold relay is further closed, a second loop is formed by a positive power supply, the normally open contact HBJ1 of the switching-on hold relay, the anti-tripping relay contact TBJV, a normally closed auxiliary node QF1 of the first breaker, a switching-on coil HQ and a negative power supply, the switching-on coil HQ is electrified, and the breaker is switched on;
after the circuit breaker completes the closing action, the normally closed auxiliary node QF1 of the first circuit breaker and the normally closed auxiliary node QF2 of the second circuit breaker are disconnected, the first circuit and the second circuit are powered off, the tripping is waited for resetting, and the two circuit breaking power supplies are respectively completed by the normally closed auxiliary node QF1 of the first circuit breaker and the normally closed auxiliary node QF2 of the second circuit breaker, so that arcing damage is avoided.
Fig. 4 schematically shows a grounding diagram of the closing circuit at the outlet pressing plate in the conventional scheme. As shown in fig. 4, in the conventional closing circuit, when the circuit breaker is at the trip position, it is assumed that the ground fault occurs at the point G1 (at the outlet pressing plate), the potential at the point G1 is pulled up to 0V from-kM, and due to the influence of the negative power end on the ground capacitance, the voltage difference kM between the point G1 and the negative power source is maintained for a period of time, so that the closing maintaining relay HBJ is electrically triggered, and the circuit breaker is closed and malfunction occurs.
As shown in fig. 2, in the closing circuit of the present invention, when the circuit breaker is in the trip position, assuming that the ground fault occurs at the G3 point (at the outlet pressing plate), the potential at the G3 point is pulled up to 0V from-kM, and the voltage difference kM between the G1 point and the negative power supply is maintained for a period of time due to the influence of the negative power supply end to the ground capacitance, but the voltage difference is only 50% of the rated voltage, so that the closing circuit is reliable and the circuit breaker is not likely to malfunction.
Further, in the present embodiment, when the circuit breaker is in the closing position, the first circuit breaker normally open auxiliary node QF3 and the second circuit breaker normally open auxiliary node QF4 are in the closed state, and when the protection device issues the trip command, the automatic trip contact ZTJ is closed, and a third loop is formed by the positive power supply, the automatic trip contact ZTJ, the second circuit breaker normally open auxiliary node QF4, the trip hold relay TBJ, the second voltage dividing resistor r and the negative power supply, and at this time, the trip hold relay TBJ is powered on;
further, the normally open contact TBJ1 of the tripping maintaining relay is closed, a fourth loop is formed by the positive power supply, the normally open contact TBJ of the tripping maintaining relay, the normally open auxiliary node QF3 of the first breaker, the tripping coil TQ and the negative power supply, the tripping coil TQ is electrified, and the breaker trips;
after the breaker finishes tripping action, the first breaker normally open auxiliary node QF3 and the second breaker normally open auxiliary node QF4 are disconnected, the third loop and the fourth loop are all powered off and wait for closing and resetting, and the two loops of cut-off power supply are respectively completed by the first breaker normally open auxiliary node QF3 and the second breaker normally open auxiliary node QF4, so that arc discharge damage is avoided.
Fig. 5 schematically illustrates a ground map of the trip circuit at the outlet hold-down in a conventional approach. As shown in fig. 5, in the conventional trip circuit, when the circuit breaker is at the closing position, assuming that the ground fault occurs at the G2 point (at the outlet pressing plate), the potential at the G2 point is pulled up to 0V from-kM, and the voltage difference kM between the G2 point and the negative power supply is maintained for a period of time due to the influence of the negative power supply end on the ground capacitance, so that the trip hold relay TBJ is electrically triggered, and thus the circuit breaker trips to malfunction.
As shown in fig. 3, in the trip circuit of the present invention, when the circuit breaker is in the closing position, assuming that the ground fault occurs at the G4 point (at the outlet pressing plate), the potential at the G4 point is pulled up to 0V from-kM, and the voltage difference kM between the G4 point and the negative power supply is maintained for a period of time due to the influence of the negative power supply end to the ground capacitance, but at this time, the voltage difference is only 50% of the rated voltage, and the trip circuit is reliable and does not operate, so that the circuit breaker is not likely to malfunction.
According to the scheme of the invention, the invention is improved on the basis of the original relay protection direct current operation loop, and one open loop is added for setting the action threshold of the operation loop, so that misoperation of the operation loop is prevented, auxiliary contacts of the relay are fully and reasonably utilized, the risk of arc discharge damage of the improved operation loop is prevented, the reliability of the original operation loop is improved, misoperation under the conditions of hardware faults, direct current single-point grounding at an outlet pressing plate and the like is prevented, and meanwhile, the technical route of the original traditional open loop is adopted, so that the device selection and actual application in the later stage are facilitated.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (10)
1. An optimization method for preventing misoperation of an operation loop of a direct current system, wherein the operation loop comprises a closing loop and a tripping loop, and the optimization method is characterized by comprising the following steps:
extracting a closing hold relay, a tripping hold relay, an automatic closing contact, an automatic tripping contact, a manual closing contact and a manual tripping contact in an operation loop;
after the extracted automatic closing contact and manual closing contact are connected in parallel, and the automatic tripping contact and manual tripping contact are connected in parallel, one end of the automatic closing contact and the manual tripping contact are respectively connected in series with a normally closed auxiliary node of the circuit breaker or a normally open auxiliary node of the circuit breaker, a closing hold relay or a tripping hold relay and a voltage dividing resistor in sequence, so that a new circuit is constructed;
and connecting the head and the tail of the constructed new circuit into the anode and the cathode of the bus respectively.
2. The optimization method for preventing malfunction of an operation loop of a direct current system according to claim 1, wherein the closing loop comprises a normally open contact of a closing hold relay, an anti-tripping relay contact, a normally closed auxiliary node of a first circuit breaker, a closing coil, a trip position relay, a manual closing contact, an automatic closing contact, a normally closed auxiliary node of a second circuit breaker, a closing hold relay and a first voltage dividing resistor;
the normally open contact of the closing holding relay is connected in series with the anti-tripping relay contact, then connected in parallel with the tripping position relay, and then connected in series with a normally closed auxiliary node of the first circuit breaker and a closing coil in sequence; the two ends of the circuit are respectively connected with the anode and the cathode of the direct current power supply;
the manual closing contact is connected with the automatic closing contact in parallel, and then is connected with a normally closed auxiliary node of the second circuit breaker, a closing holding relay and a first voltage dividing resistor in series in sequence; the two ends of the circuit are respectively connected with the anode and the cathode of the direct current power supply.
3. The optimization method for preventing malfunction of a dc system operating circuit of claim 1, wherein the trip circuit includes a trip hold relay normally open contact, a first breaker normally open auxiliary node, a trip coil, a closing position relay, a manual trip contact, an automatic trip contact, a second breaker normally open auxiliary node, a trip hold relay, and a second voltage divider resistor;
the normally open contact of the tripping maintaining relay is connected in parallel with the tripping position relay, and then a normally open auxiliary node of the first circuit breaker and a tripping coil are sequentially connected in series; the two ends of the circuit are respectively connected with the anode and the cathode of the direct current power supply;
the manual tripping contact is connected with the automatic tripping contact in parallel and then is connected with a normally open auxiliary node of the second circuit breaker, a tripping hold relay and a second voltage dividing resistor in series in sequence; the two ends of the circuit are respectively connected with the anode and the cathode of the direct current power supply.
4. The optimization method for preventing malfunction of operation circuit of direct current system according to claim 2, wherein the operation threshold setting is performed by the first voltage dividing resistor and the closing holding relay in the closing circuit, so that the closing holding relay is reliably not operated when the closing circuit is applied with a rated voltage of 55% or less, and the closing holding relay is reliably operated when the closing circuit is applied with a rated voltage of 70% or more.
5. The optimization method for preventing malfunction of operation circuit of direct current system according to claim 3, wherein the trip circuit is set by action threshold through the second voltage dividing resistor and the trip holding relay, so that the trip circuit can reliably not act under the rated voltage of 55%, and the trip circuit can reliably act under the rated voltage of 70%.
6. The optimization method for preventing malfunction of an operation circuit of a direct current system according to claim 1, wherein the closing hold relay and the trip hold relay are voltage type relays.
7. The optimization method for preventing malfunction of dc system operation circuit according to claim 4, wherein when the switching-on circuit performs operation threshold setting through the first voltage dividing resistor and the switching-on holding relay, simultaneously:
the closing hold relay is reliable and does not act;
the switching-on maintaining relay reliably acts;
wherein R1 represents the resistance value of the first voltage dividing resistor, rh represents the internal resistance of the closing holding relay, un represents the rated voltage of the direct-current operation loop, and Uh represents the voltage on the closing holding relay.
8. The optimization method for preventing malfunction of dc system operation circuit according to claim 5, wherein when the trip circuit performs operation threshold setting through the second voltage dividing resistor and the trip holding relay, simultaneously:
the tripping keeps the relay reliable and non-action;
the trip keeps the relay reliably acting;
wherein R2 represents the resistance value of the second voltage dividing resistor, rt represents the internal resistance of the trip holding relay, un represents the rated voltage of the direct current operation loop, and Ut represents the voltage on the trip holding relay.
9. The optimization method for preventing misoperation of an operation loop of a direct current system according to claim 2, 4 or 7, wherein when the circuit breaker is in a tripping position, a normally closed auxiliary node of the first circuit breaker and a normally closed auxiliary node of the second circuit breaker are in a closed state, when a closing command is sent by a protection device, an automatic closing contact is closed, a first loop is formed by a positive power supply, the automatic closing contact, the normally closed auxiliary node of the second circuit breaker, a closing holding relay, a first voltage dividing resistor and a negative power supply, at the moment, the closing holding relay is electrified, and then a normally open contact of the closing holding relay is closed, a second loop is formed by the positive power supply, the normally open contact of the closing holding relay, the anti-tripping relay contact, the normally closed auxiliary node of the first circuit breaker, a closing coil and the negative power supply, and the closing coil is electrified;
after the circuit breaker finishes the closing action, the normally closed auxiliary node of the first circuit breaker and the normally closed auxiliary node of the second circuit breaker are disconnected, the first circuit and the second circuit are both powered off and wait for tripping and resetting, and the two-circuit cutting-off power supply is respectively completed by the normally closed auxiliary node of the first circuit breaker and the normally closed auxiliary node of the second circuit breaker.
10. The optimizing method for preventing misoperation of the operation loop of the direct current system according to claim 3, 5 or 8, characterized in that when the circuit breaker is in a closing position, the first circuit breaker normally open auxiliary node and the second circuit breaker normally open auxiliary node are in a closing state, when the protection device sends out a tripping command, an automatic tripping contact is closed, a third loop is formed by a positive power supply, the automatic tripping contact, the second circuit breaker normally open auxiliary node, a tripping hold relay, a second voltage dividing resistor and a negative power supply, at the moment, the tripping hold relay is electrified, and then the tripping hold relay normally open contact is closed, a fourth loop is formed by the positive power supply, the tripping hold relay normally open contact, the first circuit breaker normally open auxiliary node, the tripping coil and the negative power supply, the tripping coil is electrified, and the circuit breaker trips;
after the circuit breaker finishes tripping action, the normally open auxiliary node of the first circuit breaker is disconnected with the normally open auxiliary node of the second circuit breaker, the third circuit and the fourth circuit are all powered off and wait for closing and resetting, and the two-circuit power-off is respectively completed by the normally open auxiliary node of the first circuit breaker and the normally open auxiliary node of the second circuit breaker.
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| CN111458633A (en) * | 2020-04-28 | 2020-07-28 | 广东电网有限责任公司揭阳供电局 | Tripping and closing monitoring circuit and fault alarming method |
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2024
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| CN105006806A (en) * | 2015-08-18 | 2015-10-28 | 安阳工学院 | Circuit breaker series connection type electrical trip prevention circuit |
| CN204858540U (en) * | 2015-08-18 | 2015-12-09 | 安阳工学院 | Circuit breaker serial -type is electric prevents rebound way |
| US10340678B1 (en) * | 2018-04-23 | 2019-07-02 | Richard W. Sorenson | Electronic circuit breaker with physical open-contact construction and fail-safe protection |
| CN109509658A (en) * | 2018-12-29 | 2019-03-22 | 国网北京市电力公司 | A kind of relay protection DC control circuit and its full working scope monitoring and fault early warning method |
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