CN110729716B - Circuit for sharing auxiliary contact for double-bus inverted bus operation - Google Patents
Circuit for sharing auxiliary contact for double-bus inverted bus operation Download PDFInfo
- Publication number
- CN110729716B CN110729716B CN201810786651.6A CN201810786651A CN110729716B CN 110729716 B CN110729716 B CN 110729716B CN 201810786651 A CN201810786651 A CN 201810786651A CN 110729716 B CN110729716 B CN 110729716B
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- bus
- power supply
- relay
- loop
- circuit
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- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000003071 parasitic effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- 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
Abstract
The invention relates to the field of double-bus electric control, in particular to a circuit with auxiliary contacts shared by double-bus inverted operation. According to the invention, the monitoring relays are respectively added on the power supply sides of the two control power supply loops, and the closing contact of the disconnecting link is additionally arranged at the N end of the common contact of the inverted female operation interlocking loop, so that the two power supplies can be effectively isolated when the power supply side fails. The invention can effectively isolate one power supply from the other power supply when the other power supply fails, avoid the connection of the two power supplies, avoid the generation of a parasitic loop, eliminate the hidden danger of safety accidents and realize electric interlocking.
Description
Technical Field
The invention relates to the field of double-bus electric control, in particular to a circuit with auxiliary contacts shared by double-bus inverted operation.
Background
With the expansion of the development scale of the modern transformer substation, the number of configured intervals is correspondingly increased, the space position in a mechanism box of a shaping standard GIS produced by a manufacturer is smaller, the number of auxiliary contacts is limited, and the situation that the number of auxiliary contacts of a double-bus switching operation interlocking loop with a bus connection interval and a related interval is insufficient often occurs.
And now more and more areas are for safety reasons not allowing the original mechanical auxiliary contacts to be replaced by using the extension contacts of the reclosing relay, and the inverted mother capacity of the mother connection interval can be enlarged by utilizing a pair of auxiliary contacts of the mother connection interval to be shared with two bus disconnecting link operation interlocking loops related to each interval. However, when the knife switch control power supply is required to be in a one-to-one mode according to some areas, the problem that the positive and negative power lines or the zero line of an AC live wire of the control power supply are not matched is caused by the inverted female operation interlocking of a pair of auxiliary contacts with a female connection interval, as is obvious from the attached figure 1, when one of the 8A1 or 8A2 control power supplies is in an open manual switching-off state or fails and trips, the N power supply loops of the two control loops cannot be synchronously disconnected, the N ends of the two control loops are not disconnected, the power supplies are not independently separated, particularly when one of the 8A1 or 8A2 control power supplies is in an open manual switching-off state or fails and trips, operation maintenance personnel can mistakenly consider that one of the DS1 and DS2 control loops should be reliably disconnected from the power supply on the side by the 8A1 or 8A2 control loop, so that when the control power supply loops are subjected to inspection work, such as mistakenly touching any DC power supply positive electrode or AC power supply, the DC power supply can possibly cause short circuit of DC (AC) or grounding of the negative electrode of the live wire, serious potential safety hazards of the personal safety hazards, and serious accident such as misoperation are caused; and because other uncontrollable factors cause parasitic phenomenon between the two control power supply loops, a great potential safety hazard exists.
Disclosure of Invention
The invention aims to provide a circuit with auxiliary contacts shared by double-bus inverted operation, which is used for solving the problem that two power supplies cannot be reliably isolated when the power supply side of the existing double-bus inverted operation interlocking loop fails.
In order to achieve the above purpose, the invention provides a circuit with auxiliary contacts shared by double bus inverting operations, which comprises a first bus loop and a second bus loop, wherein an inverting operation interlocking loop is arranged between the first bus loop and the second bus loop, the inverting operation interlocking loop shares a pair of auxiliary contacts with the first bus loop or the second bus loop, a first relay and a second relay are respectively arranged on the power supply sides of the first bus loop and the second bus loop, and a first normally open contact of the first relay and a first normally open contact of the second relay are respectively connected in series in an N-end circuit of the inverting operation interlocking loop.
The beneficial effects of the invention are as follows: the monitoring relay is respectively added on the power supply sides of the two control power supply loops, and the closing contact of the disconnecting link is additionally arranged at the N end of the common contact of the inverted female operation interlocking loop, so that the two power supplies can be effectively isolated when the power supply side fails.
Furthermore, the N end of the inverted bus operation interlocking loop is also provided with a closing contact of a first disconnecting link and a second disconnecting link in series, and the first disconnecting link and the second disconnecting link are respectively arranged in the first bus loop and the second bus loop in series.
Further, the second normally open contact of the first relay and the second normally open contact of the second relay are respectively connected in series to the power end of the inverted female operation interlocking loop.
The invention can effectively isolate one power supply from the other power supply when the other power supply fails, avoid the connection of the two power supplies, avoid the generation of a parasitic loop, eliminate the hidden danger of safety accidents and realize electric interlocking.
Drawings
FIG. 1 is an electrical interlock diagram of a prior art double bus bar reverse bus operation;
FIG. 2 is an electrical interlock diagram of embodiment 1 of the present invention;
FIG. 3 is an electrical interlock diagram of embodiment 2 of the present invention;
fig. 4 is an electrical interlock diagram of embodiment 3 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
The invention provides a circuit for sharing auxiliary contacts for double-bus inverted operation, which is used for solving the problem that double buses cannot be thoroughly isolated when a power supply fails. Specific examples are given below.
Example 1
As shown in FIG. 2, the control power supply comprises a DS1 side control power supply and a DS2 side control power supply, and the power supply sides of the control power supply loops of the disconnecting link DS1 and the disconnecting link DS2 are respectively connected with one monitoring relay 1CAX and one monitoring relay 2CAX in a matched mode, so that the whole loops of the control power supplies of the disconnecting link DS1 and the disconnecting link DS2 can be monitored respectively. One normally open contact 12-8 of the relays 1CAX and 2CAX is connected to the N end in the interlocking loop of the disconnecting link DS1 and DS2, and when a certain control power supply of the disconnecting link DS1 or DS2 is empty to be separated or the loop is in power failure abnormality, the contact 12-8 of the relays 1CAX and 2CAX connected in series into the interlocking loop is disconnected, so that the two power supplies are thoroughly separated.
Example two
As shown in fig. 3, the improvement can be further performed on the basis of the first embodiment, in which the switching-on contact of DS1 and DS2 is additionally arranged at the N end of the common contact of the interlocking circuit of the switching operation of the disconnecting link DS1 and DS2, when the power supplies of the disconnecting link DS1 and DS2 are in the normal power supply state, the switching-on contact is in the disconnected state when the disconnecting link is in the separated state, the N end of the power supply is connected with the switching-on contact of the other disconnecting link in series, so that the N end of the two disconnecting link circuits are prevented from being connected in series when the disconnecting link is in the separated state.
Example III
As shown in fig. 4, on the basis of the second embodiment, after improvement, the other normally open contact 9-5 of the relays 1CAX and 2CAX is connected to the upper end, i.e. the power supply side, in the interlocking circuit of the knife switches DS1 and DS2, and when a certain control power supply of the knife switch DS1 or the knife switch DS2 is empty and is in a split position or the circuit thereof loses power under the abnormal condition, the contact 9-5 of the relays 1CAX and 2CAX connected in series to the interlocking circuit is also disconnected.
The technical scheme can reliably disconnect and withdraw the fault loop and the bus-tie interval auxiliary contact switching operation interlocking loop, thoroughly isolate and separate the power-losing loop from the normal power-on loop, avoid parasitic caused by other factors, and greatly improve the safety of the loop.
In other embodiments, the number of normally open contacts of the relay may be increased, or specific positions of the relay and the contacts may be changed, or other equivalent devices may be adopted to replace the relay to realize the same function, so that the technical scheme formed by fine tuning the above embodiments still falls within the protection scope of the present invention.
Claims (3)
1. The utility model provides a circuit of two bus bar operation sharing auxiliary contact, includes first bus bar return circuit and second bus bar return circuit, be provided with between first bus bar return circuit and the second bus bar return circuit and fall female operation interlocking loop, fall female operation interlocking loop with first bus bar return circuit or second bus bar return circuit sharing a pair of auxiliary contact, its characterized in that: the power supply sides of the first bus loop and the second bus loop are respectively provided with a first relay and a second relay, and a first normally open contact of the first relay and a first normally open contact of the second relay are respectively connected in series in an N-end circuit of the inverted bus operation interlocking loop; the first relay and the second relay are used for monitoring power supplies of power supply sides of the two bus loops respectively, and when a certain power supply fails, the first normally open contacts of the first relay and the second relay are disconnected, so that the two power supplies are thoroughly isolated.
2. A circuit for sharing auxiliary contacts for double bus bar reversing operation according to claim 1, wherein: the N end of the inverted bus operation interlocking loop is also provided with a closing contact of a first disconnecting link and a second disconnecting link in series, and the first disconnecting link and the second disconnecting link are respectively arranged in the first bus loop and the second bus loop in series.
3. A circuit for sharing auxiliary contacts for double bus bar reverse bus operation according to claim 1 or 2, wherein: the second normally open contact of the first relay and the second normally open contact of the second relay are respectively connected in series with the power end of the inverted female operation interlocking loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810786651.6A CN110729716B (en) | 2018-07-17 | 2018-07-17 | Circuit for sharing auxiliary contact for double-bus inverted bus operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810786651.6A CN110729716B (en) | 2018-07-17 | 2018-07-17 | Circuit for sharing auxiliary contact for double-bus inverted bus operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110729716A CN110729716A (en) | 2020-01-24 |
| CN110729716B true CN110729716B (en) | 2023-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810786651.6A Active CN110729716B (en) | 2018-07-17 | 2018-07-17 | Circuit for sharing auxiliary contact for double-bus inverted bus operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110729716B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113471939B (en) * | 2021-06-07 | 2024-03-29 | 深圳供电局有限公司 | Method for monitoring and alarming fault of interlocking loop in disconnecting link control loop |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203747412U (en) * | 2014-04-02 | 2014-07-30 | 国电大渡河流域水电开发有限公司龚嘴水力发电总厂 | Electricity breaker with charges prevention apparatus when double bus bar changes its operation state |
| CN205920338U (en) * | 2016-07-12 | 2017-02-01 | 四川电器成套设备有限公司 | Double -bus control circuit's interlocking control circuit |
| CN206412754U (en) * | 2017-01-23 | 2017-08-15 | 广西平班水电开发有限公司 | A kind of switch operation self-sustaining control circuit with faulty action preventing defencive function |
-
2018
- 2018-07-17 CN CN201810786651.6A patent/CN110729716B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203747412U (en) * | 2014-04-02 | 2014-07-30 | 国电大渡河流域水电开发有限公司龚嘴水力发电总厂 | Electricity breaker with charges prevention apparatus when double bus bar changes its operation state |
| CN205920338U (en) * | 2016-07-12 | 2017-02-01 | 四川电器成套设备有限公司 | Double -bus control circuit's interlocking control circuit |
| CN206412754U (en) * | 2017-01-23 | 2017-08-15 | 广西平班水电开发有限公司 | A kind of switch operation self-sustaining control circuit with faulty action preventing defencive function |
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| Publication number | Publication date |
|---|---|
| CN110729716A (en) | 2020-01-24 |
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