CN108630505B - Control circuit for switching on and off of direct current breaker - Google Patents
Control circuit for switching on and off of direct current breaker Download PDFInfo
- Publication number
- CN108630505B CN108630505B CN201810669067.2A CN201810669067A CN108630505B CN 108630505 B CN108630505 B CN 108630505B CN 201810669067 A CN201810669067 A CN 201810669067A CN 108630505 B CN108630505 B CN 108630505B
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- coil
- switching
- contactor
- normally open
- open contact
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- 238000007599 discharging Methods 0.000 claims description 15
- 230000005389 magnetism Effects 0.000 abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 239000011162 core material Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/121—Protection of release mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/2436—Electromagnetic mechanisms with a holding and a releasing magnet, the holding force being limited due to saturation of the holding magnet
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/24—Electromagnetic mechanisms
- H01H71/26—Electromagnetic mechanisms with windings acting in opposition
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention relates to a control circuit for switching on and off a direct current breaker, and belongs to the technical field of direct current breaker control. When the direct current breaker is used for switching off, current opposite to the main circuit of the switching-on coil is applied to the two ends of the switching-on coil, the switching-on coil is charged reversely, residual magnetism of iron core materials of the switching-on coil is eliminated, switching-off speed of the switching-on coil is improved, and guarantee is provided for quick switching-off.
Description
Technical Field
The invention relates to a control circuit for switching on and off a direct current breaker, and belongs to the technical field of direct current breaker control.
Background
In a low voltage distribution network, the most easily occurring and destroyed fault is a short circuit. Circuit breakers are the most effective electrical devices that avoid greater damage from short circuit faults and must have good short circuit turn-on and break capabilities.
In order to meet the switching-on and switching-off function requirement of the circuit breaker, a mechanical operating mechanism such as a spring and air pressure and an electromagnetic operating mechanism are generally used for an operating mechanism of the circuit breaker to be matched. However, in the faults of the circuit breaker, the proportion of mechanical faults is high, because the mechanical device is generally complex in structure, the potential safety hazards are difficult to remove, and the requirements on the working environment are high. In contrast, the electromagnetic operating mechanism has the advantages of simple structure, low manufacturing cost, high reliability and the like, so that the operating mechanism of the circuit breaker needs to use the electromagnetic mechanism as much as possible so as to ensure that the circuit breaker works more reliably.
Along with the wide popularization and application of direct current power transmission and distribution, the importance of the direct current circuit breaker is increasingly highlighted. Among the dc circuit breakers, mechanical dc circuit breakers developed from ac circuit breakers have been widely used because of low cost, mature technology, and the like. Compared with an alternating current circuit breaker, the direct current circuit breaker has quite different application environments, and the direct current circuit breaker breaks a main circuit of a closing coil in a switching-off process, so that the closing coil is powered off, switching-off operation of the circuit breaker is realized, but in the process, residual magnetism exists in the closing coil of the circuit breaker made of ferromagnetic materials, and the quick switching-off of the circuit breaker is influenced.
Disclosure of Invention
The invention aims to provide a control circuit for switching on and off of a direct current breaker, which aims to solve the problem that the switching-on speed is influenced by residual magnetism of a switching-on coil when the direct current breaker is switched on and off.
The invention provides a control circuit for opening and closing a direct current breaker, which aims to solve the technical problems, and comprises a primary part and a secondary part, wherein the primary part comprises a main circuit comprising a closing coil; the two ends of the closing coil are connected with a charging branch circuit with the current direction opposite to that of the main circuit of the closing coil in parallel, and the charging branch circuit is connected with a normally open contact of a third contactor in series; the two ends of the closing coil are also connected in parallel with a discharging branch, the discharging branch comprises a switching-off resistor, a normally closed contact of a second time relay and a freewheeling diode which are connected in series, the discharging branch is used for discharging the closing coil after the main circuit of the closing coil is disconnected, and the charging branch is used for reversely charging the closing coil after the discharging of the closing coil meets the set requirement; the two ends of the normally open contact of the first contactor are connected with a divider resistor in parallel; in the secondary part, after the first contactor coil is connected in series with the normally closed contact of the first time relay, the second part power supply is connected through the first starting switch and the second starting switch, the two ends of the first starting switch are connected with the normally open contact of the second contactor in parallel, the first time relay coil, the second contactor coil and the first diode are connected in parallel with the two ends of the normally closed contact of the first contactor and the first time relay in series, the middle relay coil is connected with the second part power supply through the second starting switch after being connected in series with the normally closed contact of the third time relay, the normally open contact of the middle relay is connected with the two ends of the second starting switch in parallel, the coil of the third time relay, the coil of the second time relay and the second diode are connected with the two ends of the normally closed contact of the third time relay in parallel, and the coil of the third contactor is connected to the second part power supply through the normally open contact of the second time relay.
When the direct current breaker is used for switching off, current opposite to the main circuit of the switching-on coil is applied to the two ends of the switching-on coil, the switching-on coil is charged reversely, residual magnetism of iron core materials of the switching-on coil is eliminated, switching-off speed of the switching-on coil is improved, and guarantee is provided for quick switching-off.
Drawings
Fig. 1 is a schematic circuit diagram of a control circuit for opening and closing a dc breaker according to the present invention.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings.
The embodiment of the invention relates to a control method for opening and closing a direct current breaker
The control method for switching on and off of the direct current breaker is that when the direct current breaker is switched on and off, a main circuit of a switching-on coil of the direct current breaker is disconnected, so that the switching-on coil is powered off, current opposite to the current of the main circuit is applied to two ends of the switching-on coil, and the switching-on coil is charged reversely, so that residual magnetism of iron core materials of the switching-on coil is eliminated, switching-on speed of the switching-on coil is improved, and guarantee is provided for quick switching-on and switching-off. The implementation of this method is described in detail in the following embodiments of the control circuit, and will not be described in detail here.
Embodiments of a control circuit for opening and closing a DC breaker of the present invention
The control circuit for switching on and off of the direct current breaker comprises a primary part and a secondary part, wherein the primary part comprises a switching-on coil main circuit, two ends of the switching-on coil are connected with charging branches with the current direction opposite to that of the switching-on coil main circuit in parallel, the charging branches are used for reversely charging the switching-on coil when the direct current breaker is switched on and the main circuit of the switching-on coil is switched off, so that residual magnetism of iron core materials of the switching-on coil is eliminated, and a guarantee is provided for quick switching-on.
Specifically, as shown in fig. 1, the primary part is powered by a 220V direct current power supply, the switching-on coil main circuit of the primary part comprises a miniature circuit breaker QF1, a normally open contact of a first contactor KM2, a first normally open contact of a second contactor KM1 and a switching-on coil which are connected in series at two ends of the primary power supply (220V direct current), a charging branch circuit with opposite current direction to the switching-on coil main circuit is connected in parallel at two ends of the switching-on coil, the normally open contact of a third contactor KM3 is connected in series on the charging branch circuit, when the direct current circuit breaker performs switching-off operation, any one of the normally open contact of the first contactor KM2 and the first normally open contact of the second contactor KM1 is controlled to be disconnected, the main circuit of the switching-on coil is controlled to be closed, and the switching-on coil is reversely charged.
In order to ensure that the switching-on coil can thoroughly discharge when the direct-current breaker is switched off, two ends of the switching-on coil are also connected with a discharging branch, the discharging branch comprises a switching-off resistor and a freewheeling diode which are connected in series, the discharging branch is used for discharging the switching-on coil after the main circuit of the switching-on coil is disconnected, and the contact point of the discharging branch and the switching-on coil is connected with a primary power supply through a normally closed contact of a third contactor KM 3; when the main circuit of the closing coil is disconnected, the energy of the closing coil is rapidly released through the freewheel diode and the opening resistor, after the current in the freewheel loop is reduced to zero, the KM3 coil is electrified, the normally open contact is closed, the normally closed contact is disconnected, the closing coil is reversely charged, and the residual magnetism of the iron core material is eliminated.
When the switching-on is completed, if the DC220V power supply is directly applied to the switching-on coil, the heating is serious and the switching-on performance is affected because the switching-on coil is too high in voltage.
The secondary part of the control circuit is shown in fig. 1, and is powered by 24V direct current, a coil of a first contactor KM2 is connected with a normally closed contact of a first time relay KT1 in series, then the 24V direct current is connected through starting switches SB1 and SB2, normally open contacts of a second contactor KM1 are connected at two ends of the first starting switch in parallel, and the coil of the first time relay KT1, the coil of the second contactor and a first diode are connected at two ends of the normally closed contact of the first time relay KT1 in series in parallel; after the coil of the intermediate relay KA is connected in series with the normally closed contact of the third time relay KT3, 24V direct current is connected through a starting switch SB2, the normally open contact of the intermediate relay KA is connected in parallel with two ends of SB2, and the coil of the third time relay KT3, the coil of the second time relay KT2 and the second diode are connected in parallel with two ends of the serially connected KA coil and the normally closed contact of KT 3; the coil of the third contactor KM3 is connected to 24V dc via the normally open contact of the second time relay KT 2.
The specific control process of the circuit is as follows: when the circuit breaker is switched on, miniature circuit breakers QF1 and QF2 are closed, a switch SB1 is closed, a first time relay KT1 coil, a first contactor KM2 coil and a second contactor KM1 coil are all electrified, normally open contacts KM1 and KM2 are closed, DC220V voltage is directly applied to two sides of a switching-on coil, current in the coil is large, rapid switching-on is carried out, and meanwhile, a switching-off spring is charged. After the closing action of the circuit breaker is finished, the KT1 normally-closed contact delay switch is disconnected, the KM2 coil is powered off, the KM2 contact is disconnected, the divider resistor is connected into the main circuit, the voltage of the closing coil is reduced, proper closing holding force is provided for the circuit breaker, meanwhile, power consumption is reduced, and overheating of the electromagnet is avoided.
When the switching-off operation is performed, an SB2 button is pressed, the KM1 coil is powered off, the KM1 contact is disconnected, and the main loop of the switching-on coil is powered off; the coils of the time relays KT2 and KT3 are powered; after the main loop is powered off, the energy of the closing coil is quickly released through the freewheeling diode and the opening resistor, after the current in the freewheeling loop is reduced to zero, the KT2 normally-closed contact delay switch is opened, the normally-open delay switch is closed, the KM3 coil is electrified, the normally-open contact is closed, the normally-closed contact is opened, the closing coil is reversely charged, the remanence of the iron core material is eliminated, and finally the KT3 normally-closed contact delay switch is opened, so that the whole circuit is powered off.
Claims (1)
1. The control circuit for switching on and off of the direct current breaker comprises a primary part and a secondary part, wherein the primary part comprises a main circuit of a switching-on coil; the two ends of the closing coil are connected with a charging branch circuit with the current direction opposite to that of the main circuit of the closing coil in parallel, the charging branch circuit is connected with a normally open contact of a third contactor in series, when the direct current breaker executes a switching-off operation, any one of the normally open contact of the first contactor and the first normally open contact of the second contactor is controlled to be disconnected, the main circuit of the closing coil is disconnected, the normally open contact of the third contactor is controlled to be closed, and the closing coil is reversely charged; the two ends of the closing coil are also connected in parallel with a discharging branch, the discharging branch comprises a switching-off resistor, a normally closed contact of a second time relay and a freewheeling diode which are connected in series, the discharging branch is used for discharging the closing coil after the main circuit of the closing coil is disconnected, and the connection point of the discharging branch and the closing coil is connected with a primary power supply through the normally closed contact of a third contactor; after the discharge of the closing coil reaches the set requirement, the charging branch is used for reversely charging the closing coil; the two ends of the normally open contact of the first contactor are connected with a divider resistor in parallel; one end of a first normally open contact of the second contactor is connected with a primary power supply, and the other end of the first normally open contact of the second contactor is connected with a contact point of a normally open contact of the first contactor and a voltage dividing resistor; in the secondary part, a first contactor coil is connected with a normally closed contact of a first time relay in series and then connected with a secondary part power supply through a first starting switch and a second starting switch, two ends of the first starting switch are connected with a second normally open contact of a second contactor in parallel, the first time relay coil, the second contactor coil and a first diode are connected with two ends of the normally closed contact of the first time relay in series in parallel, an intermediate relay coil is connected with a secondary part power supply through the second starting switch after being connected with a normally closed contact of a third time relay in series, the normally open contact of the intermediate relay is connected with two ends of the second starting switch in parallel, the coil of the third time relay, the coil of the second time relay and the second diode are connected with two ends of the normally closed contact of the intermediate relay in series in parallel, and the coil of the third contactor is connected with the secondary part power supply through the normally open contact of the second time relay in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810669067.2A CN108630505B (en) | 2018-06-26 | 2018-06-26 | Control circuit for switching on and off of direct current breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810669067.2A CN108630505B (en) | 2018-06-26 | 2018-06-26 | Control circuit for switching on and off of direct current breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108630505A CN108630505A (en) | 2018-10-09 |
| CN108630505B true CN108630505B (en) | 2024-03-26 |
Family
ID=63688296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810669067.2A Active CN108630505B (en) | 2018-06-26 | 2018-06-26 | Control circuit for switching on and off of direct current breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108630505B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1332951A (en) * | 1961-09-02 | 1963-07-19 | Tridon Mfg Ltd | Control system for motor vehicle signaling devices |
| CN2266795Y (en) * | 1996-08-28 | 1997-11-05 | 李博 | Universal contact silent operation leakage protector |
| US5696661A (en) * | 1996-09-24 | 1997-12-09 | Vieira; Marisa Barbosa | Remanence switching device |
| CN101221863A (en) * | 2007-09-07 | 2008-07-16 | 西安交通大学 | Double coil variable current control circuit of vacuum circuit breaker permanent magnet mechanism |
| CN202695293U (en) * | 2012-08-13 | 2013-01-23 | 华通机电股份有限公司 | Energy storage type energy-saving ac contactor |
| CN104157509A (en) * | 2014-07-29 | 2014-11-19 | 东南大学 | Control device and method of bistable permanent-magnet vacuum circuit breaker rapid divide-shut brake |
| CN104167327A (en) * | 2014-07-31 | 2014-11-26 | 东南大学 | Control circuit and method for five-coil high-voltage permanent magnet operating mechanism with auxiliary opening coils |
| CN208352237U (en) * | 2018-06-26 | 2019-01-08 | 河南森源电气股份有限公司 | A kind of control circuit of dc circuit breaker divide-shut brake |
-
2018
- 2018-06-26 CN CN201810669067.2A patent/CN108630505B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1332951A (en) * | 1961-09-02 | 1963-07-19 | Tridon Mfg Ltd | Control system for motor vehicle signaling devices |
| CN2266795Y (en) * | 1996-08-28 | 1997-11-05 | 李博 | Universal contact silent operation leakage protector |
| US5696661A (en) * | 1996-09-24 | 1997-12-09 | Vieira; Marisa Barbosa | Remanence switching device |
| CN101221863A (en) * | 2007-09-07 | 2008-07-16 | 西安交通大学 | Double coil variable current control circuit of vacuum circuit breaker permanent magnet mechanism |
| CN202695293U (en) * | 2012-08-13 | 2013-01-23 | 华通机电股份有限公司 | Energy storage type energy-saving ac contactor |
| CN104157509A (en) * | 2014-07-29 | 2014-11-19 | 东南大学 | Control device and method of bistable permanent-magnet vacuum circuit breaker rapid divide-shut brake |
| CN104167327A (en) * | 2014-07-31 | 2014-11-26 | 东南大学 | Control circuit and method for five-coil high-voltage permanent magnet operating mechanism with auxiliary opening coils |
| CN208352237U (en) * | 2018-06-26 | 2019-01-08 | 河南森源电气股份有限公司 | A kind of control circuit of dc circuit breaker divide-shut brake |
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| Publication number | Publication date |
|---|---|
| CN108630505A (en) | 2018-10-09 |
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