CN109119964B - Intelligent controller for preventing switch tripping coil from burning - Google Patents
Intelligent controller for preventing switch tripping coil from burning Download PDFInfo
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- CN109119964B CN109119964B CN201811266365.3A CN201811266365A CN109119964B CN 109119964 B CN109119964 B CN 109119964B CN 201811266365 A CN201811266365 A CN 201811266365A CN 109119964 B CN109119964 B CN 109119964B
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- 238000004891 communication Methods 0.000 claims description 6
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- 239000003990 capacitor Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
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- 230000005611 electricity Effects 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/06—Arrangements for supplying operative power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Keying Circuit Devices (AREA)
Abstract
The invention belongs to the technical field of relay protection of power systems, in particular relates to an intelligent controller for preventing a tripping coil of a switch from being burnt, solves the problems in a tripping control loop of a circuit breaker, and mainly increases the tripping reliability of the switch and prevents the tripping coil from being burnt. The intelligent control of the original switch control loop is realized, and the burning of the tripping coil of the switch is effectively prevented, and the switch failure accident caused by the auxiliary contact point of the switch is effectively prevented. The intelligent controller also provides a plurality of auxiliary functions such as trip coil disconnection monitoring, breaker auxiliary contact reliability monitoring, trip coil temperature monitoring, closing pulse wave recording and the like.
Description
Technical Field
The invention belongs to the technical field of relay protection of power systems, in particular relates to an intelligent controller for preventing a tripping coil of a switch from being burnt, solves the problems in a tripping control loop of a circuit breaker (switch), and mainly increases the tripping reliability of the switch and prevents the tripping coil from being burnt.
Background
The basic structure of the switch control loop formed by connecting a tripping contact loop output by a relay protection device of a power element (such as a circuit, a transformer, a bus and the like) of the current power system with a switch tripping coil loop is shown in the accompanying figures 1 and 2 of the specification.
The switch tripping circuit TBJ is an anti-tripping and tripping self-retaining relay, when the protection tripping, the tripping relay junction TJ is closed, and 220V direct current voltage is added to the two ends of the tripping coil TQ through the TBJ relay current coil and the closed breaker auxiliary junction DL, so that the switch is tripped.
In the tripping process, in order to prevent the switch from refusing to operate due to the mechanical clamping shell of the tripping mechanism, the fault is cut off by the upper-stage protection, the TJ contact of the protection is returned, if no measures are taken, the TJ contact is burnt out due to arc discharge, and therefore the two ends of the tripping contact are connected with the tripping self-holding contact of the TBJ tripping relay in parallel, so that the TJ contact is protected from being burnt out.
TBJ introduction of a self-retaining contact of a trip-proof relay brings about a problem: once the switch is not successful in tripping, the DL auxiliary contacts do not switch and break the trip circuit, and the two ends of TQ are always charged until burned out.
Another aspect is the introduction of auxiliary contacts to the trip circuit switch, which reduces the reliability of the trip of the switch and can deactivate the switch once the auxiliary contacts of the switch are in poor contact.
The conventional switch tripping circuit brings about burning accidents of the switch coil and switch failure accidents caused by poor contact of auxiliary contacts of the switch, and the accidents occur in a large number in the field operation.
Compared with the microcomputer and intellectualization of the relay protection device, the traditional structure of the switch control loop still stays at the unintelligent level for decades.
Disclosure of Invention
In order to solve the technical problems, the invention provides an intelligent controller for preventing a switch tripping coil from being burnt.
The intelligent controller for preventing the switch tripping coil from being burnt comprises a direct current operation power supply failure automatic remedying loop (1), a trip-proof relay self-holding state automatic restoration loop (3) and an intelligent control module (4), wherein the direct current operation power supply failure automatic remedying loop (1) is connected with a switch tripping loop (2), the switch tripping loop (2) is connected with the trip-proof relay self-holding state automatic restoration loop (3), a plurality of switching value input joints, a plurality of analog value input joints, a CPU logic operation module, a plurality of switching value output joints, a communication interface and an inverter power supply are arranged on the intelligent control module (4), the direct current operation power supply failure automatic remedying loop (1) provides electric energy for the inverter power supply, output joints in the switch tripping loop (2) and the trip-proof relay self-holding state automatic restoration loop (3) are connected with the switching value input joints on the intelligent control module (4), analog value output in the switch tripping loop (2) and the trip-proof self-holding state automatic restoration loop (3) are connected with the analog value input joints in the intelligent control module through the CPU logic operation module, and the analog value input joints in the intelligent control module are connected with the intelligent control module through the CPU logic operation module and the communication interface.
Further, the direct current operation power supply power failure automatic remedying loop (1) comprises a storage battery direct current circuit and an alternating current rectification output direct current circuit, wherein the storage battery direct current circuit is sequentially connected with two normally open contacts, two reverse diodes D3 and D4 of a direct current power supply monitoring relay ZJ2 from a 220V direct current positive and negative power supply terminal C, D, and finally outputs to terminals 201 and 202;
the alternating current rectification output direct current circuit is sequentially connected with a 220V/160V alternating current transformer, a rectifier bridge formed by 4 diodes and 4 capacitors from an A terminal and a B terminal which are connected with a 220V alternating current power supply, rectifies 220V alternating current into 220V direct current, and finally outputs the 220V direct current to terminals 201 and 202 through two reverse diodes D1 and D2 and two normally-closed contacts of a direct current monitoring relay ZJ 2;
the direct current operation power supply power failure automatic remedying loop (1) is connected with the switch tripping loop (2) through terminals 201 and 202.
Further, in the switch tripping circuit (2), there are provided position points 235, 237 and 239, and three current detecting transformers are provided between 235 and 237, 237 and DL, and DL and 239, respectively.
Further, the automatic reset circuit (3) of the self-holding state of the anti-jump relay comprises a switch auxiliary contact test branch, an automatic reset branch of the self-holding state of the anti-jump relay, a trip circuit switch auxiliary contact state monitoring branch, a trip coil disconnection monitoring branch and a positive electrode power supply 201 ground voltage monitoring branch;
the auxiliary switch contact test branch route R1 and the output contact SYJ are connected in series and then are connected in parallel between 237 and 239 contacts of a switch tripping loop, R1 is 110 omega resistor, and the output contact SYJ is a switching value output contact in the intelligent control module (4);
the self-holding filling automatic resetting branch route R2 of the anti-jump relay and the output contact FGJ are connected in series and then connected in parallel between the contact 201 and the contact 237 to form, R2 is a variable resistor of 0-10Ω, and the output contact FGJ is a switching value output contact in the intelligent control module (4);
the tripping circuit switch auxiliary contact state monitoring branch is formed by connecting a tripping circuit switch auxiliary contact state monitoring relay DLJ with a circuit between contacts 237 and 239 in parallel, connecting two DLF contacts with DL contacts in series and then connecting the two DLF contacts between the 237 and 239 in parallel, wherein DL is between the two DLFs, and two DLF output contacts are two switching value output contacts in an intelligent control module (4);
the trip coil broken wire monitoring branch is formed by connecting a trip coil broken wire monitor DX1 in parallel between a contact 202 and a contact 237, wherein the contact of the DX1 is a switching value output contact in an intelligent control module (4);
the positive electrode power supply 201 ground voltage monitoring branch is formed by connecting a positive electrode power supply 201 ground voltage monitoring relay JD1 in parallel between a contact 202 and a contact 235, wherein the JD1 contact is a switching value output contact in the intelligent control module (4).
Further, the contacts 201 and 202 are connected with an inverter power supply of the intelligent control module (4), the switch quantity input contacts comprise a tripping outlet standby contact TJ taken from a protection device, a manual tripping relay contact STJ taken from a protection switch operation loop, a temperature relay contact WJ arranged on a tripping coil, a contact DX1 output by a tripping coil disconnection monitoring relay DX1 in an anti-tripping relay self-holding state automatic reset loop (3), a contact JD1 output by a negative power supply ground voltage monitoring relay JD1 output by the anti-tripping relay self-holding state automatic reset loop (3) and a switch auxiliary contact DL, and the DL is led in after being output by a switch mechanism and is one-to-two contact;
the analog input contact comprises CT secondary three-phase current IABC and zero-sequence current I0 input by the protection device, and currents I235, I237 and I239 output by current detection transformers between 235 and 237, between 237 and DL and between DL and 239 in the switch tripping loop (2);
the switching value output terminal is provided with an alarm switching value output terminal in addition to the SYJ, FGJ, and two DLFs, DX1, JD1 described in claim 4.
Compared with the prior art, the invention has the advantages that:
1. the intelligent control module is utilized to prevent the switch tripping circuit from being electrified for a long time and prevent the switch coil TQ from being burnt;
2. the intelligent control module only increases the reliability of tripping without negative influence;
3. the monitoring circuit is provided with a tripping circuit whether the tripping circuit is good or not, and the resistance value of the tripping circuit is given at any time;
4. the tripping coil temperature monitoring circuit is provided, when the temperature of the tripping coil is too high, alarm information is given, and the tripping circuit is automatically disconnected for 200 milliseconds and then is connected;
5. the automatic switching function of the standby tripping power supply is provided. The switch refusing action caused by the fault reason of the storage battery and the charger is prevented;
6. the tripping pulse wave recording function: providing an analysis basis for searching the theft jump reason of the switch;
7. the switch auxiliary contact forced-connection function is provided with: the intelligent control module is provided with a switch auxiliary contact forced switch-on button, and contacts of the switch auxiliary contact forced switch-on button are connected in parallel with two ends of an original switch auxiliary contact. When a control loop disconnection signal appears, the intelligent control module automatically and temporarily turns on the button contact, if the control loop disconnection disappears, the auxiliary contact of the switch is not good, and one of the common reasons of the control loop disconnection is automatically judged;
8. the system has the function of real-time communication with a transformer substation background monitoring system.
Drawings
FIG. 1 is a typical prior art switch trip circuit;
FIG. 2 is a simplified prior art switch trip circuit;
FIG. 3 is a schematic diagram of an automatic remedy loop for power loss of a DC operating power supply;
FIG. 4 is a schematic diagram of a switch trip circuit;
FIG. 5 is a self-holding state automatic reset circuit of the anti-trip relay;
FIG. 6 is a schematic diagram of the intelligent control module;
fig. 7 is a block diagram of an automatic reset logic of the anti-trip relay.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 3, in order to prevent the direct current operation power supply in the intelligent controller of the switch tripping coil from burning out from losing electricity and automatically remedying the loop (1), wherein, the A, B terminal is respectively connected with the 220V alternating current power supply used by the transformer substation or the 220V alternating current power supply outside, the 220V alternating current power supply is output to the terminals 201 and 202 through the reverse diodes D1 and D2 and two normally closed contacts of the direct current monitoring relay ZJ2 after being reduced by the 1000 watt alternating current transformer with the transformation ratio of 220V/160V, and then is output to the terminals 201 and 202 through the rectifier bridge composed of four diodes of G1, G2, G3 and G4 which can pass through 10A current, and the capacitors of C1, C2, C3 and C4 which withstand 300 volts and have the capacity of 2000 microfarads;
C. the terminals D are 220V direct current positive and negative power terminals of the transformer substation respectively, the terminals C are connected with the 220V positive power terminal 101, and the terminals D are connected with the 220V negative power terminal 102.ZJ2 is a transformer substation direct current power supply monitoring relay, when the transformer substation has a normal 220V direct current power supply, the ZJ2 relay is in an action state, and 101 and 102 direct currents are output to terminals 201 and 202 through normally open contacts of the two ZJ2 and two reverse diodes D3 and D4, and the direct current is a storage battery direct current circuit.
The final function of the direct current operation power supply power failure automatic remedying loop (1) is as follows: the 220V alternating current in the transformer substation is changed into 220V direct current with the same voltage as the direct current storage battery in the transformer substation through voltage regulation, rectification and filtering. When the direct current of the storage battery in the transformer substation is electrified, the direct current of the storage battery is used by the operation direct currents 201 and 202 of the switch, and when the direct current of the storage battery disappears, the direct current output by alternating current rectification is adopted. The problem of how to realize correct tripping of the switch under the condition that the power supply of the direct-current storage battery pack of the transformer substation is damaged is solved.
Referring to fig. 4, a switch tripping circuit is shown, wherein 201 and 202 are positive and negative terminals of the dc 220V power supply output in fig. 3, TJ is a tripping contact output by a protection device, TBJ is an anti-tripping relay of an original switch control circuit, DL is a switch auxiliary contact (switched on when the switch is turned on), TQ is a switch tripping coil, 235, 237 and 239 are current detecting transformers between 235 and 237, between 237 and DL, and between DL and 239 respectively in different positions of the tripping circuit, and I235, I237 and I239 are current detecting transformers between 235 and 237, between DL and 239 respectively, when current flows through the wire of the section, the transformer has current output for the second time.
Referring to fig. 5, in order to provide an automatic return circuit for the self-holding state of the anti-trip relay, R1 is 110 ohms, the resistance power is 300W, 2A current can be passed in a short time, SYJ is a contact point output from the intelligent control module, when the switch is at the closing position and the disconnection phenomenon of the control circuit occurs, the intelligent control module closes the SYJ contact point for 10 seconds, and judges whether the disconnection phenomenon of the control circuit disappears, and if so, the contact failure of the auxiliary contact point of the switch is judged.
R2 is an adjustable resistor (changing between 0 and 10 ohms), FGJ is an automatic reset relay contact of the self-holding state of the anti-jump relay, the node is output by intelligent control, and when the intelligent control module judges that the switch is tripped for a few seconds, the protection fault current IABC is disappeared, but the auxiliary contact DL of the switch is not changed, the switch is automatically turned on FGJ for a certain time and then is automatically turned off.
The DLJ is an auxiliary contact state monitoring relay of the tripping circuit switch, when the switch is in a closing state, if the direct current voltage of more than 110V appears at the two ends of the DLJ relay, the poor contact of the auxiliary contact of the switch is indicated, the intelligent control module automatically outputs a pair of contacts DLF, and the tripping circuit is forcibly switched on after the intelligent control module is connected with an external DL contact in series, so that the switching refusal operation of the switch is prevented.
The DX1 relay is a tripping coil wire breakage monitoring relay, 220V voltage appears at two ends of the relay to act when the tripping coil wire breakage occurs, the relay contact DX1 is connected into an intelligent control module, and a tripping coil wire breakage signal is sent out through the intelligent control module.
JD1 is a relay for monitoring the voltage of the positive electrode power supply 201 to the ground, when the positive electrode power supply is grounded, the relay acts, and the relay contact JD1 is connected to the intelligent control module.
201, 202, 235, 237, 239 in fig. 5 are directly connected to the 201, 202, 235, 237, 239 terminals in fig. 4 in one-to-one correspondence.
Referring to fig. 6, for the construction of the intelligent control module, the operating power supply 201, 202 of the inverter power module is taken from the terminals 201, 202 of fig. 3. Contact point input by the switching value input module: TJ is taken from the trip outlet backup contact of the protection device; the STJ is taken from the manual trip relay contacts of the protection switch operating circuit; WJ is a temperature relay contact mounted on the trip coil; DX1 is the junction of the output of the trip coil wire break monitoring relay DX1 of fig. 5; JD1 is the contact point of the negative power supply ground voltage monitoring relay JD1 output in fig. 5; DL is the auxiliary contact of the switch, which is introduced after being output by the switch mechanism, and is one opening and one closing two contacts.
Input quantity of analog quantity input module: IABC and I0 are CT secondary three-phase current and zero sequence current input by the protection device, and are used for judging whether the primary current of the switch disappears and whether the switch refuses to operate; i235, I237, I239 are currents output from the current detecting transformers between 235 and 237, 237 and DL, and DL and 239 in fig. 4, respectively. When electricity is generated, the section of wire is indicated to have tripping pulse, which provides wave recording data for analyzing the reasons of the switch stealing.
The contact point output by the switching value output module: FGJ is an automatic reset contact of the anti-jump relay in a self-holding state, and when the intelligent control module judges that the switch is tripped for a few seconds, the protection fault current IABC is disappeared, but the auxiliary contact DL of the switch is not changed, the switch is automatically turned on FGJ for a certain time and then is automatically turned off.
DLF is an alternative auxiliary contact output after the contact failure of the auxiliary contact, and if a dc voltage of 110V or more appears at both ends of the DLJ relay in fig. 5, it indicates the contact failure of the auxiliary contact, and the intelligent control module fig. 6 automatically outputs a pair of DLF contacts.
The DX1 contact is a trip coil disconnection signal contact which is output to a transformer substation monitoring system.
JD1 is the direct current positive electrode ground monitoring contact, and the output is given transformer substation background monitored control system.
The SYJ junction output determines whether the switch auxiliary junction contacts the defective test junction. When the switch is at a closing position and the control loop is broken, the intelligent control module enables the SYJ contact to be closed for 10 seconds and then to be opened, whether the control loop is broken or not is judged during closing, and if the control loop is broken, poor contact of the auxiliary contact of the switch is judged.
The alarm contact is a self running state monitoring contact output by the intelligent control module, and when the CPU logic goes wrong, the power fails, and the like, the contact is closed and output to a transformer substation background monitoring system so as to be known by a running operator on duty.
CPU logic operation module: and carrying out logic operation, analysis, wave recording and the like on information of switching value input and analog value input, and finally enabling the switching value output module to output corresponding command signals so as to enable the communication interface module to communicate with the external connection.
Referring to fig. 7, in order to automatically reset the anti-trip relay, when a short circuit fault occurs in the system, a switch is initially in the on position, a trip command is sent to a circuit breaker by a protective trip junction TJ action, or the circuit breaker is manually switched off, the STJ action is performed, after a delay of T1, the switch is proved to be in a refusal action (the anti-trip self-holding loop is always operated at this time), after a delay of T2, the FGJ relay is driven to be operated for 100 milliseconds and then returned, and during a period of 100 milliseconds of the FGJ relay action, a normally-closed contact of the FGJ relay is connected in parallel with two ends of a current holding coil of the anti-trip relay TBJ, so that TBJ is reset in a magnetic loss, and the trip holding loop is disconnected.
The intelligent control of the original switch control loop is realized after the connection of the figures 3, 4, 5, 6 and 7 according to the numbers and the modes described above, so that the burning of the tripping coil of the switch and the switch refusing accident caused by the auxiliary contact point of the switch are effectively prevented.
The intelligent control module also provides a plurality of auxiliary functions such as trip coil disconnection monitoring, breaker auxiliary contact reliability monitoring, trip coil temperature monitoring, closing pulse wave recording and the like.
Claims (2)
1. The intelligent controller is characterized by comprising a direct current operation power supply failure automatic remedying loop (1), an anti-jump relay self-holding state automatic remedying loop (3) and an intelligent control module (4), wherein the direct current operation power supply failure automatic remedying loop (1) is connected with a switch tripping loop (2), the switch tripping loop (2) is connected with the anti-jump relay self-holding state automatic remedying loop (3), the intelligent control module (4) is provided with a plurality of switching value input contacts, a plurality of analog value input contacts, a CPU logic operation module, a plurality of switching value output contacts, a communication interface and an inverter power supply, the direct current operation power supply failure automatic remedying loop (1) provides electric energy for the inverter power supply, output contacts in the switch tripping loop (2) and the anti-jump relay self-holding state automatic remedying loop (3) are connected with switching value input contacts on the intelligent control module (4), analog value output in the switch tripping loop (2) and the anti-jump relay self-holding state automatic remedying loop (3) are connected with analog value input contacts in the intelligent control module through the analog control module input contacts, and the analog value input control module is connected with the input control module through the communication interface;
the direct-current operation power supply power failure automatic remedying loop (1) comprises a storage battery direct-current circuit and an alternating-current rectification output direct-current circuit, wherein the storage battery direct-current circuit is sequentially connected with two normally-open contacts, two reverse diodes D3 and D4 of a direct-current power supply monitoring relay ZJ2 from a 220V direct-current positive and negative power supply terminal C, D and finally outputs to terminals 201 and 202;
the alternating current rectification output direct current circuit is sequentially connected with a 220V/160V alternating current transformer, a rectifier bridge formed by 4 diodes and 4 capacitors from an A terminal and a B terminal which are connected with a 220V alternating current power supply, rectifies 220V alternating current into 220V direct current, and finally outputs the 220V direct current to terminals 201 and 202 through two reverse diodes D1 and D2 and two normally-closed contacts of a direct current monitoring relay ZJ 2;
connecting the direct-current operation power supply power failure automatic remedying loop (1) with the switch tripping loop (2) through terminals 201 and 202;
in the switch tripping loop (2), position points 235, 237 and 239 are arranged, and three current detection transformers are respectively arranged between 235 and 237, between 237 and DL and between DL and 239;
the automatic reset circuit (3) of the self-holding state of the anti-jump relay comprises a switch auxiliary contact test branch, an automatic reset branch of the self-holding state of the anti-jump relay, a trip circuit switch auxiliary contact state monitoring branch, a trip coil broken line monitoring branch and a positive electrode power supply 201 grounding voltage monitoring branch;
the auxiliary switch contact test branch route R1 and the output contact SYJ are connected in series and then connected in parallel between 237 and 239 contacts of a switch tripping loop, R1 is 110 omega resistor, and the output contact SYJ is a switching value output contact in the intelligent control module (4);
the self-holding filling automatic resetting branch route R2 of the anti-jump relay and the output contact FGJ are connected in series and then connected between the 201 contact and the 237 contact in parallel, R2 is a variable resistor of 0-10Ω, and the output contact FGJ is a switching value output contact in the intelligent control module (4);
the tripping circuit switch auxiliary contact state monitoring branch is formed by connecting a tripping circuit switch auxiliary contact state monitoring relay DLJ with a circuit between contacts 237 and 239 in parallel, connecting two DLF contacts with DL contacts in series and then connecting the two DLF contacts between the 237 and 239 in parallel, wherein DL is between the two DLFs, and two DLF output contacts are two switching value output contacts in an intelligent control module (4);
the trip coil broken wire monitoring branch is formed by connecting a trip coil broken wire monitor DX1 in parallel between a contact 202 and a contact 237, wherein the contact of the DX1 is a switching value output contact in an intelligent control module (4);
the positive electrode power supply 201 ground voltage monitoring branch is formed by connecting a positive electrode power supply 201 ground voltage monitoring relay JD1 in parallel between a contact 202 and a contact 235, wherein the JD1 contact is a switching value output contact in the intelligent control module (4).
2. The intelligent controller for preventing the burnout of a switching trip coil according to claim 1, wherein the contacts 201 and 202 are connected with an inverter power supply of an intelligent control module (4), the plurality of switching value input contacts comprise a trip outlet standby contact TJ taken from a protection device, a manual trip relay contact STJ taken from a protection switch operation loop, a temperature relay contact WJ installed on the trip coil, a contact DX1 output by a trip coil broken wire monitoring relay DX1 in an anti-trip relay self-holding state automatic reset loop (3), a contact JD1 output by a negative power supply ground voltage monitoring relay JD1 output by the anti-trip relay self-holding state automatic reset loop (3) and a switch auxiliary contact DL, and the DL is introduced after being output by a switching mechanism to open and close two contacts;
the analog input contact comprises CT secondary three-phase current IABC and zero-sequence current I0 input by the protection device, and currents I235, I237 and I239 output by current detection transformers between 235 and 237, between 237 and DL and between DL and 239 in the switch tripping loop (2);
the switching value output contact is provided with an alarm switching value output contact in addition to the SYJ, FGJ, two DLFs, DX1 and JD 1.
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| CN201811266365.3A CN109119964B (en) | 2018-10-29 | 2018-10-29 | Intelligent controller for preventing switch tripping coil from burning |
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| 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 |
| CN110601148B (en) * | 2019-09-03 | 2021-08-10 | 积成电子股份有限公司 | Automatic protection method for high-voltage switch motor |
| CN111308333B (en) * | 2019-11-07 | 2024-07-02 | 广东电网有限责任公司 | Relay protection tripping circuit contact resistance detection device and method |
| CN111934291B (en) * | 2020-07-21 | 2022-07-26 | 广东电网有限责任公司 | Method for judging circuit breaker tripping due to stealing and electrical tripping |
| CN112332402A (en) * | 2020-09-18 | 2021-02-05 | 北京潞电电气设备有限公司 | Dual-power measurement and control device |
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| US5729119A (en) * | 1996-06-28 | 1998-03-17 | Siemens Energy & Automation, Inc. | Dual mode power supply and under voltage trip device |
| CN2290136Y (en) * | 1997-03-17 | 1998-09-02 | 罗昌林 | On-off coil protector for circuit braker |
| JP2005065424A (en) * | 2003-08-14 | 2005-03-10 | Tm T & D Kk | Automatic monitoring circuit for protective relay system |
| CN201698628U (en) * | 2010-06-23 | 2011-01-05 | 邢台供电公司 | Simulator of circuit breaker |
| CN202586261U (en) * | 2012-03-27 | 2012-12-05 | 杭州华光电气有限公司 | Breaker tripping and closing protective device |
| CN103943396A (en) * | 2013-01-22 | 2014-07-23 | 珠海优特电力科技股份有限公司 | Circuit breaker operation loop |
| CN103618282A (en) * | 2013-11-26 | 2014-03-05 | 江苏国网自控科技股份有限公司 | Intelligent tripping control system and method of anti-interference module |
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