CN112421581B - Monitoring system and method for microcomputer protection - Google Patents
Monitoring system and method for microcomputer protection Download PDFInfo
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- CN112421581B CN112421581B CN202011012805.XA CN202011012805A CN112421581B CN 112421581 B CN112421581 B CN 112421581B CN 202011012805 A CN202011012805 A CN 202011012805A CN 112421581 B CN112421581 B CN 112421581B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The invention relates to a monitoring device for microcomputer protection, which comprises 2 outlet driving circuits, wherein any one of the outlet driving circuits comprises a parallel port, a decoder, a driving outlet, a logic gate, a delay channel and an outlet relay, the output end of the parallel port is electrically connected with the input end of the decoder, the output end of the decoder is electrically connected with the input end of the driving outlet, the output end of the driving outlet is electrically connected with the input end of the logic gate, and the input end of the logic gate is electrically connected with the input end of the delay channel and the input end of the outlet relay. The monitoring device, the system and the method for microcomputer protection can prevent the protection misoperation caused by the reasons of faults, electromagnetic interference and the like of the internal elements of the protection device, and improve the reliability of the protection operation; meanwhile, the single outlet relay failure can not cause protection refusal, and the N-1 design of a protection outlet loop is realized.
Description
Technical Field
The present invention relates to the field of relay protection, and more particularly, to a monitoring system and method for microcomputer protection.
Background
The quality of the outlet loop element in the microcomputer protection device cannot be guaranteed, and the outlet loop element cannot be tested by a traditional test method, such as the lowest action voltage, the highest action voltage, insulation and the like, and no technology is used for monitoring the outlet loop element at present, including an outlet relay action contact, a coil and an optical coupler. Only the quality of the product is guaranteed, but in recent years, the phenomenon of refusal and misoperation of the outlet of some protection devices is found many times. There is no concern that we have with the quality of some devices. For a circuit breaker control loop, a jump relay and a closing relay are adopted as a control loop disconnection monitoring method at present, but the method has defects that mechanisms such as an action contact point of an outlet relay, a coil, an optical coupler and the like cannot be monitored.
In the prior art, chinese patent No. CN111446130a discloses a "monitoring circuit for a circuit breaker protection trip circuit", the publication date is 24 of the year 2020, which includes that the positive pole of the dc power supply is connected to one end of the normally open contact of the protection trip outlet relay and one end of the protection trip position monitoring lamp, the other end of the protection trip position monitoring lamp is connected to one end of the protection trip position relay coil, the other end of the protection trip position relay coil and the other end of the normally open contact of the protection trip outlet relay are connected to one end of the protection trip pressing plate, the other end of the protection trip pressing plate is connected to one end of the auxiliary normally open contact of the circuit breaker, the other end of the auxiliary normally open contact of the circuit breaker is connected to one end of the opening coil, and the other end of the opening coil is connected to the negative pole of the dc power supply; the invention connects the protective jump position monitor lamp and the protective tripping pressing plate through the tripping position relay coil, but the method can not monitor the action contact point of the outlet relay, the coil, the optical coupler and other mechanisms, and can not monitor the whole microcomputer protective outlet and the monitoring loop.
Disclosure of Invention
The invention provides a monitoring system and a method for microcomputer protection, which are used for solving the technical defect that the whole microcomputer protection outlet and a monitoring loop cannot be monitored at present.
In order to achieve the aim of the invention, the technical scheme adopted is as follows:
the utility model provides a monitoring devices for microcomputer protection, includes 2 export drive circuit, arbitrary export drive circuit includes parallel mouth, decoder, drive export, logic gate, delay channel and export relay, the output of parallel mouth with decoder input electric connection, decoder output with the input electric connection of drive export, the output of drive export with logic gate input electric connection, logic gate input with delay channel input and export relay input all electric connection.
In the above scheme, the control of the outlet trip is not one bit, but a so-called output password consisting of a plurality of bits or a plurality of output ports; in an outlet driving circuit, a parallel port outputs a password for protecting starting and tripping, and the password is decoded by a decoder to drive an outlet; in another output driving circuit, another parallel port outputs the cipher when the main component is normal, the device outputs when the operation is normal, and the other decoder decodes the cipher to drive the output. The two outlets of the drive constitute an AND to issue a trip command. In order to prevent two parallel ports from being interfered or failed, the two parallel ports are respectively used for outputting 1 and 0, so that each bit forming a password is designed to be staggered with 1 and 0, if the code word is 010101 during the action, two outlets are driven to drive an AND gate again, one outlet circuit is used for enabling one outlet relay to act, the other outlet circuit is used for enabling the other outlet relay to act, and the two circuits are respectively connected with the joints of the two outlet relays in series to form an overall outlet joint; the protection misoperation caused by the reasons of faults of internal elements of the protection device, electromagnetic interference and the like can be prevented, and the reliability of the protection operation is improved; meanwhile, the single outlet relay failure can not cause protection refusal, and the N-1 design of a protection outlet loop is realized.
The parallel port, the decoder, the driving outlet and the logic gate in any one of the outlet driving circuits are all set to be 2, the output end of the first parallel port is electrically connected with the input end of the first decoder, the output end of the first decoder is electrically connected with the input end of the first driving outlet, the output end of the first driving outlet is electrically connected with the input end of the first logic gate, and the output end of the first logic gate is electrically connected with the input end of the delay channel; the output end of the second parallel port is electrically connected with the input end of the second decoder, the output end of the second decoder is electrically connected with the input end of the second driving outlet, the output end of the second driving outlet is electrically connected with the input end of the second logic gate, and the output end of the second logic gate is electrically connected with the input end of the outlet relay.
The decoder is a binary decoder.
The first logic gate is an or gate.
The second logic gate is an and gate.
The monitoring system for microcomputer protection uses a monitoring device for microcomputer protection, and comprises a monitoring device U, an outlet relay K, a tripping position relay TWJ, a closing position relay HWJ, a current relay DL, a tripping coil TQ, a closing coil HQ, a tripping outlet TC and a closing outlet HC, wherein the monitoring device U comprises two outlet relays, namely an outlet relay K1 and an outlet relay K2, the number of the outlet relays K is 2, and the outlet relays K3 and the outlet relays K4; the number of the current relays DL is set to 2, one ends of the outlet relays K1 and K3 are electrically connected with positive electricity of the mains supply, the other end of the outlet relay K3 is electrically connected with one end of the monitoring device U output end and one end of the outlet relay K4, the other end of the outlet relay K2 is electrically connected with one end of the tripping outlet TC, the other end of the tripping outlet TC is electrically connected with one end of the current relay DL1, the other end of the current relay DL1 is electrically connected with one end of the tripping coil TQ, the other end of the tripping coil TQ is electrically connected with negative electricity of the mains supply, the other end of the outlet relay K4 is electrically connected with one end of the switching-on outlet HC, the other end of the switching-on outlet HC is electrically connected with the other end of the current relay DL2, the other end of the switching-on coil HQ is electrically connected with the negative electricity of the mains supply, two ends of the switching-on position HWJ are respectively electrically connected with the positive electricity of the mains supply and the other end of the tripping coil TC, and the two ends of the switching-on position HC are electrically connected with the two ends of the mains supply.
In the above scheme, the monitoring device U is connected to the positive and negative electrodes of the control power supply and the potential of the point A. When the K1 outlet relay is closed, the point A has a positive point, and when the K2 outlet relay is closed, the point A has negative electricity in a closing state of the circuit breaker. The monitoring device U can be tripped when the outlet relays K1 and K2 act simultaneously; the design and logic judgment method of the circuit breaker control loop monitoring circuit can monitor the whole control loop without leaving dead zones, and is more perfect than the method of monitoring by adopting a trip position relay.
The monitoring device U comprises 2 outlet driving circuits, wherein any one outlet driving circuit comprises a parallel port, a decoder, a driving outlet, a logic gate, a delay channel and an outlet relay, the output end of the parallel port is electrically connected with the input end of the decoder, the output end of the decoder is electrically connected with the input end of the driving outlet, the output end of the driving outlet is electrically connected with the input end of the logic gate, and the input end of the logic gate is electrically connected with the input end of the delay channel and the input end of the outlet relay.
The parallel port, the decoder, the driving outlet and the logic gate in any one of the outlet driving circuits are all set to be 2, the output end of the first parallel port is electrically connected with the input end of the first decoder, the output end of the first decoder is electrically connected with the input end of the first driving outlet, the output end of the first driving outlet is electrically connected with the input end of the first logic gate, and the output end of the first logic gate is electrically connected with the input end of the delay channel; the output end of the second parallel port is electrically connected with the input end of the second decoder, the output end of the second decoder is electrically connected with the input end of the second driving outlet, the output end of the second driving outlet is electrically connected with the input end of the second logic gate, and the output end of the second logic gate is electrically connected with the input end of the outlet relay.
The first logic gate is an OR gate; the second logic gate is an and gate.
A monitoring method for microcomputer protection is applied to a monitoring system for microcomputer protection, and comprises the following steps:
s1: the monitoring device U is connected to the switching-on position contact, when the monitoring device U is detected to be switched on, only the tripping circuit is detected, and when the monitoring device U is detected to be tripped, only the switching-on circuit is detected;
s2: when the monitoring device U is switched on, a tripping command pulse is sent to the outlet relay K1, the delay time T1 is set, the potential of the point A is detected, when the point A is positive, the K1 driving circuit, the coil or the contact is normal, the delay time T2 is set, when the point A is negative, the K1 driving circuit, the coil or the contact is failed, or the positive power supply is controlled to open;
s3: after the delay time T2 is set, detecting the potential of the point A, when the point A is positive, the K2 driving circuit, the coil or the contact is normal, and when the point A is negative, the K2 driving circuit, the coil or the contact is failed, or the tripping circuit is failed;
s4: when the detection monitoring device U is not opened, a tripping command pulse is sent to the outlet relay K3, delay time T3 is set, the potential of a point B is detected, when the point B is positive, a K3 driving loop, a coil or a contact is normal, delay time T4 is set, and when the point B is negative, the K3 driving loop, the coil or the contact is failed, or the positive power supply is controlled to be opened;
s5: after the delay time T4 is set, the potential of the point B is detected, when the point B is positive, the driving circuit, the coil or the contact of the point K4 is normal, and when the point B is negative, the driving circuit, the coil or the contact of the point K4 is faulty, or the switching-on circuit is faulty.
Compared with the prior art, the invention has the beneficial effects that:
the monitoring system and the method for microcomputer protection can prevent the protection misoperation caused by the reasons of faults, electromagnetic interference and the like of the internal elements of the protection device, and improve the reliability of the protection operation; meanwhile, the single outlet relay failure can not cause protection refusal, and the N-1 design of a protection outlet loop is realized.
Drawings
FIG. 1 is a schematic diagram of a monitoring device of the present invention;
FIG. 2 is a schematic diagram of a monitoring system according to the present invention;
fig. 3 is a flow chart of the method of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
the invention is further illustrated in the following figures and examples.
Example 1
As shown in fig. 1, a monitoring device for microcomputer protection includes 2 outlet driving circuits, where any one of the outlet driving circuits includes a parallel port, a decoder, a driving outlet, a logic gate, a delay channel and an outlet relay, where an output end of the parallel port is electrically connected with an input end of the decoder, an output end of the decoder is electrically connected with an input end of the driving outlet, an output end of the driving outlet is electrically connected with an input end of the logic gate, and an input end of the logic gate is electrically connected with an input end of the delay channel and an input end of the outlet relay.
In the above scheme, the control of the outlet trip is not one bit, but a so-called output password consisting of a plurality of bits or a plurality of output ports; in an outlet driving circuit, a parallel port outputs a password for protecting starting and tripping, and the password is decoded by a decoder to drive an outlet; in another output driving circuit, another parallel port outputs the cipher when the main component is normal, the device outputs when the operation is normal, and the other decoder decodes the cipher to drive the output. The two outlets of the drive constitute an AND to issue a trip command. In order to prevent two parallel ports from being interfered or failed, the two parallel ports are respectively used for outputting 1 and 0, so that each bit forming a password is designed to be staggered with 1 and 0, if the code word is 010101 during the action, two outlets are driven to drive an AND gate again, one outlet circuit is used for enabling one outlet relay to act, the other outlet circuit is used for enabling the other outlet relay to act, and the two circuits are respectively connected with the joints of the two outlet relays in series to form an overall outlet joint; the protection misoperation caused by the reasons of faults of internal elements of the protection device, electromagnetic interference and the like can be prevented, and the reliability of the protection operation is improved; meanwhile, the single outlet relay failure can not cause protection refusal, and the N-1 design of a protection outlet loop is realized.
The parallel port, the decoder, the driving outlet and the logic gate in any one of the outlet driving circuits are all set to be 2, the output end of the first parallel port is electrically connected with the input end of the first decoder, the output end of the first decoder is electrically connected with the input end of the first driving outlet, the output end of the first driving outlet is electrically connected with the input end of the first logic gate, and the output end of the first logic gate is electrically connected with the input end of the delay channel; the output end of the second parallel port is electrically connected with the input end of the second decoder, the output end of the second decoder is electrically connected with the input end of the second driving outlet, the output end of the second driving outlet is electrically connected with the input end of the second logic gate, and the output end of the second logic gate is electrically connected with the input end of the outlet relay.
The decoder is a binary decoder.
The first logic gate is an or gate.
The second logic gate is an and gate.
Example 2
As shown in fig. 2, a monitoring system for microcomputer protection employs a monitoring device for microcomputer protection, which comprises a monitoring device U, an outlet relay K, a trip position relay TWJ, a switch-on position relay HWJ, a current relay DL, a trip coil TQ, a switch-on coil HQ, a trip outlet TC and a switch-on outlet HC, wherein the monitoring device U comprises two outlet relays, namely an outlet relay K1 and an outlet relay K2, the number of the outlet relays K is 2, and the outlet relays K3 and the outlet relays K4; the number of the current relays DL is set to 2, one ends of the outlet relays K1 and K3 are electrically connected with positive electricity of the mains supply, the other end of the outlet relay K3 is electrically connected with one end of the monitoring device U output end and one end of the outlet relay K4, the other end of the outlet relay K2 is electrically connected with one end of the tripping outlet TC, the other end of the tripping outlet TC is electrically connected with one end of the current relay DL1, the other end of the current relay DL1 is electrically connected with one end of the tripping coil TQ, the other end of the tripping coil TQ is electrically connected with negative electricity of the mains supply, the other end of the outlet relay K4 is electrically connected with one end of the switching-on outlet HC, the other end of the switching-on outlet HC is electrically connected with the other end of the current relay DL2, the other end of the switching-on coil HQ is electrically connected with the negative electricity of the mains supply, two ends of the switching-on position HWJ are respectively electrically connected with the positive electricity of the mains supply and the other end of the tripping coil TC, and the two ends of the switching-on position HC are electrically connected with the two ends of the mains supply.
In the above scheme, the monitoring device U is connected to the positive and negative electrodes of the control power supply and the potential of the point A. When the K1 outlet relay is closed, the point A has a positive point, and when the K2 outlet relay is closed, the point A has negative electricity in a closing state of the circuit breaker. The monitoring device U can be tripped when the outlet relays K1 and K2 act simultaneously; the design and logic judgment method of the circuit breaker control loop monitoring circuit can monitor the whole control loop without leaving dead zones, and is more perfect than the method of monitoring by adopting a trip position relay.
The monitoring device U comprises 2 outlet driving circuits, wherein any one outlet driving circuit comprises a parallel port, a decoder, a driving outlet, a logic gate, a delay channel and an outlet relay, the output end of the parallel port is electrically connected with the input end of the decoder, the output end of the decoder is electrically connected with the input end of the driving outlet, the output end of the driving outlet is electrically connected with the input end of the logic gate, and the input end of the logic gate is electrically connected with the input end of the delay channel and the input end of the outlet relay.
The parallel port, the decoder, the driving outlet and the logic gate in any one of the outlet driving circuits are all set to be 2, the output end of the first parallel port is electrically connected with the input end of the first decoder, the output end of the first decoder is electrically connected with the input end of the first driving outlet, the output end of the first driving outlet is electrically connected with the input end of the first logic gate, and the output end of the first logic gate is electrically connected with the input end of the delay channel; the output end of the second parallel port is electrically connected with the input end of the second decoder, the output end of the second decoder is electrically connected with the input end of the second driving outlet, the output end of the second driving outlet is electrically connected with the input end of the second logic gate, and the output end of the second logic gate is electrically connected with the input end of the outlet relay.
The first logic gate is an OR gate; the second logic gate is an and gate.
Example 3
As shown in fig. 3, a monitoring method for microcomputer protection, which employs a monitoring system for microcomputer protection, includes the steps of:
s1: the monitoring device U is connected to the switching-on position contact, when the monitoring device U is detected to be switched on, only the tripping circuit is detected, and when the monitoring device U is detected to be tripped, only the switching-on circuit is detected;
s2: when the monitoring device U is switched on, a tripping command pulse is sent to the outlet relay K1, the delay time T1 is set, the potential of the point A is detected, when the point A is positive, the K1 driving circuit, the coil or the contact is normal, the delay time T2 is set, when the point A is negative, the K1 driving circuit, the coil or the contact is failed, or the positive power supply is controlled to open;
s3: after the delay time T2 is set, detecting the potential of the point A, when the point A is positive, the K2 driving circuit, the coil or the contact is normal, and when the point A is negative, the K2 driving circuit, the coil or the contact is failed, or the tripping circuit is failed;
s4: when the detection monitoring device U is not opened, a tripping command pulse is sent to the outlet relay K3, delay time T3 is set, the potential of a point B is detected, when the point B is positive, a K3 driving loop, a coil or a contact is normal, delay time T4 is set, and when the point B is negative, the K3 driving loop, the coil or the contact is failed, or the positive power supply is controlled to be opened;
s5: after the delay time T4 is set, the potential of the point B is detected, when the point B is positive, the driving circuit, the coil or the contact of the point K4 is normal, and when the point B is negative, the driving circuit, the coil or the contact of the point K4 is faulty, or the switching-on circuit is faulty.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (6)
1. A monitoring system for microcomputer protection is characterized by comprising a monitoring device U, an outlet relay K, a trip position relay TWJ, a closing position relay HWJ, a current relay DL, a trip coil TQ, a closing coil HQ, a trip outlet TC and a closing outlet HC, wherein the monitoring device U comprises an outlet relay K1, an outlet relay K2, an outlet relay K3 and an outlet relay K4; the current relay DL includes a current relay DL1 and a current relay DL2; the number of the current relays DL is set to be 2, one ends of the outlet relays K1 and K3 are electrically connected with positive electricity of the mains supply, the other end of the outlet relay K3 is electrically connected with one end of the monitoring device U output end and one end of the outlet relay K4, the other end of the outlet relay K1 is electrically connected with one end of the outlet relay K2, the other end of the outlet relay K2 is electrically connected with one end of the tripping outlet TC, the other end of the tripping outlet TC is electrically connected with one end of the current relay DL1, the other end of the current relay DL1 is electrically connected with one end of the tripping coil TQ, the other end of the tripping coil TQ is electrically connected with negative electricity of the mains supply, the other end of the outlet relay K4 is electrically connected with one end of the closing outlet HC, the other end of the closing outlet HC is electrically connected with the other end of the current relay DL2, the other end of the closing coil HQ is electrically connected with one end of the mains supply, the other end of the closing coil HQ is electrically connected with the negative electricity of the mains supply, the other end of the closing coil TQ is electrically connected with the two ends of the tripping coil TQ, and the other end of the tripping coil TQ is electrically connected with the two ends of the mains supply, and the two ends of the outlet HC are electrically connected with the position of the outlet and the outlet TQ and the outlet;
the monitoring device U further comprises 2 outlet driving circuits, wherein any one of the outlet driving circuits comprises a parallel port, a decoder, a driving outlet, a logic gate, a delay channel and an outlet relay, the output end of the parallel port is electrically connected with the input end of the decoder, the output end of the decoder is electrically connected with the input end of the driving outlet, the output end of the driving outlet is electrically connected with the input end of the logic gate, and the output end of the logic gate is electrically connected with the input end of the delay channel and the input end of the outlet relay;
the parallel port, the decoder, the driving outlet and the logic gate in any one of the outlet driving circuits are all set to be 2, the output end of the first parallel port is electrically connected with the input end of the first decoder, the output end of the first decoder is electrically connected with the input end of the first driving outlet, the output end of the first driving outlet is electrically connected with the input end of the first logic gate, and the output end of the first logic gate is electrically connected with the input end of the delay channel; the output end of the second parallel port is electrically connected with the input end of the second decoder, the output end of the second decoder is electrically connected with the input end of the second driving outlet, the output end of the second driving outlet is electrically connected with the input end of the second logic gate, and the output end of the second logic gate is electrically connected with the input end of the outlet relay.
2. A monitoring system for microcomputer protection as defined in claim 1, wherein said decoder is a binary decoder.
3. A monitoring system for microcomputer protection as defined in claim 1, wherein the first logic gate is an or gate.
4. A monitoring system for microcomputer protection as defined in claim 1, wherein the second logic gate is an and gate.
5. A monitoring system for microcomputer protection as defined in claim 1, wherein the first logic gate is an or gate; the second logic gate is an and gate.
6. A monitoring method for microcomputer protection, applied to a monitoring system for microcomputer protection as claimed in claim 1, characterized by comprising the steps of:
s1: the monitoring device U is connected to the switching-on position contact, when the monitoring device U is detected to be switched on, only the tripping circuit is detected, and when the monitoring device U is detected to be tripped, only the switching-on circuit is detected;
s2: when the monitoring device U is switched on, a tripping command pulse is sent to the outlet relay K1, the delay time T1 is set, the potential of the point A is detected, when the point A is positive, the K1 driving circuit, the coil or the contact is normal, the delay time T2 is set, when the point A is negative, the K1 driving circuit, the coil or the contact is failed, or the positive power supply is controlled to open;
s3: after the delay time T2 is set, detecting the potential of the point A, when the point A is positive, the K2 driving circuit, the coil or the contact is normal, and when the point A is negative, the K2 driving circuit, the coil or the contact is failed, or the tripping circuit is failed;
s4: when the detection monitoring device U is not opened, a tripping command pulse is sent to the outlet relay K3, delay time T3 is set, the potential of a point B is detected, when the point B is positive, a K3 driving loop, a coil or a contact is normal, delay time T4 is set, and when the point B is negative, the K3 driving loop, the coil or the contact is failed, or the positive power supply is controlled to be opened;
s5: after the delay time T4 is set, the potential of the point B is detected, when the point B is positive, the driving circuit, the coil or the contact of the point K4 is normal, and when the point B is negative, the driving circuit, the coil or the contact of the point K4 is faulty, or the switching-on circuit is faulty.
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| 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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| JP4208825B2 (en) * | 2004-12-02 | 2009-01-14 | 株式会社東芝 | Protection relay logic circuit test equipment |
| CN101202440B (en) * | 2007-10-23 | 2010-11-24 | 北京英华达电力电子工程科技有限公司 | Protection circuit of relay right action and method for preventing error action of relay |
| CN109884521B (en) * | 2019-03-28 | 2024-03-12 | 山东钢铁股份有限公司 | Circuit breaker divide-shut brake control circuit broken wire monitoring alarm circuit |
| CN110473724A (en) * | 2019-08-14 | 2019-11-19 | 珠海存中信息技术有限公司 | A kind of automatic three-phase control system of medium voltage electricity switch |
| CN210536277U (en) * | 2019-09-27 | 2020-05-15 | 无锡锡自电力自动化系统有限公司 | Circuit breaker control loop of microcomputer protection device |
| CN111446130A (en) * | 2020-03-30 | 2020-07-24 | 山东钢铁股份有限公司 | Monitoring circuit of circuit breaker protection tripping circuit |
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| 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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