CN110729716A

CN110729716A - Circuit of double-bus inverted bus operation shared auxiliary contact

Info

Publication number: CN110729716A
Application number: CN201810786651.6A
Authority: CN
Inventors: 王新姻; 刘彦军; 董建安; 刘露旋; 姜凤华; 库敖沛; 马学文; 李莹莹; 黄所旭; 李少鹏
Original assignee: Henan Pingzhi High Voltage Switchgear Co Ltd; State Grid Corp of China SGCC; Pinggao Group Co Ltd
Current assignee: Henan Pingzhi High Voltage Switchgear Co Ltd; State Grid Corp of China SGCC; Pinggao Group Co Ltd
Priority date: 2018-07-17
Filing date: 2018-07-17
Publication date: 2020-01-24
Anticipated expiration: 2038-07-17
Also published as: CN110729716B

Abstract

The invention relates to the field of double-bus electrical control, in particular to a circuit for sharing an auxiliary contact in double-bus inverted bus 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-bus operation interlocking loop, so that the two power supplies can be effectively isolated when the power supply sides are in fault. The invention can effectively isolate one power supply from the other power supply when the other power supply fails, thereby avoiding the connection of the two power supplies, avoiding the generation of parasitic loops, eliminating potential safety hazards and realizing electrical interlocking.

Description

Circuit of double-bus inverted bus operation shared auxiliary contact

Technical Field

The invention relates to the field of double-bus electrical control, in particular to a circuit for sharing an auxiliary contact in double-bus inverted bus operation.

Background

With the expansion of the development scale of modern transformer substations, the number of configured intervals is correspondingly increased and limited by sites, the internal space position of a mechanism box of a standard GIS produced by a manufacturer is small, the configuration number of auxiliary contacts is limited, and the situation that the number of bus-bar intervals and the number of auxiliary contacts of a double-bus switching operation interlocking loop at the related intervals are not enough often occurs.

And at present, due to safety considerations, more and more regions do not allow the use of a re-acting relay expansion contact to replace an original mechanical auxiliary contact, and a pair of auxiliary contacts of the bus-coupled interval are used for operating an interlocking loop together with two bus knife switches related to each interval, so that the bus-coupled interval bus reversing capacity can be expanded. However, when the disconnecting link control power supply is required to be in a one-to-one state according to some regions, the problem that the zero lines of the positive and negative or AC live wires of the control power supply are not matched by using a pair of auxiliary contacts spaced by a bus connection is caused by interlocking of the inverted bus connection, as is apparent from fig. 1, when one control power supply of 8A1 or 8A2 is disconnected manually or tripped by failure, the N power supply loop cannot be synchronously disconnected, the N ends of the two control loops are not disconnected, the power supply is not separated independently, particularly when one control power supply of 8A1 or 8A2 is disconnected manually and tripped by failure, an operation and maintenance person can mistakenly think that one control loop of DS1 and DS2 is disconnected reliably from the 8A1 or 8A2, so that when the control power supply loop of the control power supply is disconnected manually, the DC power supply short circuit or the AC live wire can be caused by mistakenly touching any DC power supply positive electrode or AC live wire when the control power supply is checked, The negative pole of the DC power supply is grounded or the personal safety is endangered, thus causing serious potential safety hazards such as misoperation and the like; and because other uncontrollable factors cause that parasitics can also be generated between the two control power supply loops, a larger potential safety hazard exists.

Disclosure of Invention

The invention aims to provide a circuit for sharing an auxiliary contact in double-bus inverted bus operation, which is used for solving the problem that two power supplies cannot be reliably isolated when the power supply side of the conventional double-bus inverted bus operation interlocking circuit fails.

In order to achieve the purpose, the invention provides a circuit with a double-bus inverted bus operation shared auxiliary contact, which comprises a first bus circuit and a second bus circuit, wherein an inverted bus operation interlocking circuit is arranged between the first bus circuit and the second bus circuit, the inverted bus operation interlocking circuit shares a pair of auxiliary contacts with the first bus circuit or the second bus circuit, a first relay and a second relay are respectively arranged on the power supply sides of the first bus circuit and the second bus circuit, and a first normally open contact of the first relay and a first normally open contact of the second relay are respectively arranged in series in an N-end circuit of the inverted bus operation interlocking circuit.

The invention has the beneficial effects that: 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-bus operation interlocking loop, so that the two power supplies can be effectively isolated when the power supply sides are in fault.

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.

Furthermore, a second normally open contact of the first relay and a second normally open contact of the second relay are respectively connected in series with the power supply ends of the inverted-bus operation interlocking loop.

The invention can effectively isolate one power supply from the other power supply when the other power supply fails, thereby avoiding the connection of the two power supplies, avoiding the generation of parasitic loops, eliminating potential safety hazards and realizing electrical interlocking.

Drawings

FIG. 1 is an electrical interlock diagram of a prior art double bus bar inversion operation;

FIG. 2 is an electrical interlock diagram according to embodiment 1 of the present invention;

FIG. 3 is an electrical interlock diagram according to embodiment 2 of the present invention;

fig. 4 is an electrical interlock diagram of embodiment 3 of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The invention provides a circuit for sharing an auxiliary contact in double-bus-bar reversing 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 one

As shown in FIG. 2, the system comprises a DS1 side control power supply and a DS2 side control power supply, and monitoring relays 1CAX and 2CAX are respectively connected to the power supply sides of control power supply loops of a disconnecting link DS1 and a disconnecting link DS2, 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 ends of the disconnecting link DS1 and DS2 in the interlocking loop, and when a certain control power supply of the disconnecting link DS1 or the disconnecting link DS2 is disconnected in a disconnection state or the loop of the disconnecting link DS2 is in power failure abnormal condition, the contact 12-8 of the relays 1CAX and 2CAX connected in the interlocking loop in series is disconnected, so that the two power supplies are thoroughly separated.

Example two

As shown in fig. 3, a further improvement can be made on the basis of the first embodiment, in which a closing contact of DS1 and DS2 is added to the N-terminal of the common contact of the interlocking circuits for switching operations of the DS1 and DS2, and when the power supplies of the switches DS1 and DS2 are both in a normal power supply state, because the switches are in an open state, the closing contact is in an open state, and the N-terminal of the power supply is connected in series with the closing contact of another switch, so that the N-terminals of the two switch circuits are prevented from being connected in series when the switches are in the open state.

EXAMPLE III

As shown in fig. 4, on the basis of the second embodiment, after the improvement, the other normally open contact 9-5 of the relays 1CAX and 2CAX can be connected to the upper end, i.e., the power supply side, of the interlocking circuits of the disconnecting switches DS1 and DS2, and when a certain control power supply of the disconnecting switch DS1 or the disconnecting switch DS2 is disconnected in the open position or the circuit thereof loses power abnormally, the contact 9-5 of the relays 1CAX and 2CAX connected in series in the interlocking circuits is also disconnected.

The technical scheme can reliably disconnect and withdraw the fault loop and the pair of auxiliary contact switching operation interlocking loops at intervals of the bus coupler, the power-off loop and the normal power-on loop are thoroughly isolated and separated from each other without mutual influence, parasitic generation caused by other factors is avoided, and the safety of the loops is greatly improved.

In other embodiments, the number of normally open contacts of the relay may be increased, or the specific positions of the relay and the contacts may be changed, or other equivalent devices may be used instead of the relay to achieve the same function, and the technical solution formed in this way is formed by performing fine adjustment on the above embodiments, and still falls within the protection scope of the present invention.

Claims

1. A circuit for sharing an auxiliary contact point by double-bus inverted bus operation comprises a first bus loop and a second bus loop, wherein an inverted bus operation interlocking loop is arranged between the first bus loop and the second bus loop, and shares a pair of auxiliary contact points with the first bus loop or the second bus loop, and the circuit is characterized in that: and the power supply sides of the first bus circuit and the second bus circuit 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 circuit.

2. The circuit of claim 1, wherein the auxiliary contact is shared by the double-bus inverted bus operation, and the circuit comprises: and 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 operating a common auxiliary contact for a double bus bar inverted bus bar according to claim 1 or 2, wherein: and the second normally open contact of the first relay and the second normally open contact of the second relay are respectively connected in series at the power supply ends of the inverted-bus operation interlocking loop.