CN211980489U - Isolator and vacuum circuit breaker interlocking circuit - Google Patents

Abstract

An interlocking circuit of an isolating switch and a vacuum circuit breaker comprises the isolating switch, the vacuum circuit breaker and a control circuit miniature circuit breaker; the vacuum circuit breaker is internally provided with a vacuum circuit breaker closing coil, a vacuum circuit breaker opening coil and a vacuum circuit breaker locking coil which are connected in parallel, and each coil is respectively connected with a vacuum circuit breaker auxiliary contact in series; the isolating switch comprises a main switch, an isolating switch normally closed auxiliary contact and an isolating switch normally open auxiliary contact; between the control loop power supplies, a closing button, an auxiliary contact of the vacuum circuit breaker and a closing coil of the vacuum circuit breaker are connected in series to form a closing loop; a brake separating button, an auxiliary contact of the vacuum circuit breaker and a brake separating coil of the vacuum circuit breaker are connected in series to form a brake separating loop; the normally open auxiliary contact of the isolating switch, the auxiliary contact of the vacuum circuit breaker and the locking coil of the vacuum circuit breaker are connected in series to form a locking loop; the normally closed auxiliary contacts of the isolating switch are connected in parallel at two ends of the closing button.

Description

Isolator and vacuum circuit breaker interlocking circuit

Technical Field

The utility model relates to a power equipment technical field, concretely relates to isolator and vacuum circuit breaker interlock circuit.

Background

Fixed looped netowrk cabinet is as a simple structure, low cost's distribution equipment is in 10kV middling pressure occasion wide application, wherein isolator cooperation vacuum circuit breaker's combination form also receives distribution workman's liking deeply, as shown in fig. 1, looped netowrk cabinet's the internal isolator 2 that is provided with of cabinet, isolator 2 is connected to current transformer 4 through vacuum circuit breaker 3, high-voltage arrester 5, voltage sensor 6 and electrically conductive female arranging 7, it has been gathered many functions such as break-make, protection, control, regulation and has been put into a whole, and small, easy operation, use in a large number in the distribution station of small capacity.

However, the disconnector cannot be operated under load and there is a strict sequence of operation with the vacuum circuit breaker, i.e. the vacuum circuit breaker can only be closed after the disconnector has been closed. Therefore, the mechanical interlocking and the professional level of electricians are often depended on, and if a mechanical fault occurs, the power distribution operation is easy to fail, and a serious condition, even a power utilization safety accident can be caused.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an isolator and vacuum circuit breaker interlocking circuit, make it can guarantee just can close a floodgate to vacuum circuit breaker after the isolator is closed.

The utility model provides a technical scheme that technical problem adopted is: an interlocking circuit of a disconnecting switch and a vacuum circuit breaker comprises the disconnecting switch and the vacuum circuit breaker, and is characterized by also comprising a control circuit miniature circuit breaker; a vacuum circuit breaker closing coil, a vacuum circuit breaker opening coil and a vacuum circuit breaker locking coil which are connected in parallel are arranged in the vacuum circuit breaker, and each coil is respectively connected with a vacuum circuit breaker auxiliary contact in series; the isolating switch comprises a main switch, an isolating switch normally closed auxiliary contact and an isolating switch normally open auxiliary contact; the vacuum circuit breaker locking coil is used for locking a closing button of the vacuum circuit breaker when the vacuum circuit breaker is not electrified and releasing the closing button of the vacuum circuit breaker when the vacuum circuit breaker is electrified;

between the control loop power supplies, a closing button, an auxiliary contact of the vacuum circuit breaker and a closing coil of the vacuum circuit breaker are connected in series to form a closing loop; a brake separating button, an auxiliary contact of the vacuum circuit breaker and a brake separating coil of the vacuum circuit breaker are connected in series to form a brake separating loop; the normally open auxiliary contact of the isolating switch, the auxiliary contact of the vacuum circuit breaker and the locking coil of the vacuum circuit breaker are connected in series to form a locking loop; the normally closed auxiliary contact of the isolating switch is connected in parallel with two ends of the closing button;

the vacuum circuit breaker auxiliary contacts on the closing loop and the closing loop are normally closed, and the vacuum circuit breaker auxiliary contacts on the opening loop are normally open; a control loop miniature circuit breaker is disposed proximate one end of the control loop power supply.

The utility model discloses an isolator and open circuit interlock circuit, it can guarantee just can close a floodgate to vacuum circuit breaker after the isolator is closed, can prevent the maloperation.

Drawings

Fig. 1 is a schematic structural diagram of an interlock circuit of a disconnecting switch and a vacuum circuit breaker according to a preferred embodiment of the present invention;

fig. 2 is a secondary schematic diagram of a disconnector and vacuum interrupter interlock circuit according to a preferred embodiment of the invention;

Detailed Description

The technical solution of the present invention will be clearly and completely described with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Please refer to fig. 2.

The utility model discloses an isolator and vacuum circuit breaker interlocking circuit, including control circuit miniature circuit breaker QF, isolator and vacuum circuit breaker. The vacuum circuit breaker is internally provided with a vacuum circuit breaker closing coil HQ, a vacuum circuit breaker opening coil TQ and a vacuum circuit breaker locking coil Y1 which are connected in parallel, and each coil is respectively connected with a vacuum circuit breaker auxiliary contact in series.

The isolating switch comprises a main switch, an isolating switch normally closed auxiliary contact GN1 and an isolating switch normally open auxiliary contact GN 2. As shown in fig. 2, when the main switch of the disconnector is opened, the normally closed auxiliary contact GN1 of the disconnector is closed, the normally closed auxiliary contact GN2 of the disconnector is opened, and when the main switch of the disconnector is closed, the states of the normally closed auxiliary contact GN1 of the disconnector and the normally open auxiliary contact GN2 of the disconnector are reversed.

And a closing button SBH, the auxiliary contact DL1 of the vacuum circuit breaker and a closing coil HQ of the vacuum circuit breaker are connected in series to form a closing loop. An opening button SBF, the vacuum circuit breaker auxiliary contact DL2 and the vacuum circuit breaker opening coil TQ are connected in series to form an opening loop. The normally open auxiliary contact GN2 of the isolating switch, the auxiliary contact DL3 of the vacuum circuit breaker and the locking coil Y1 of the vacuum circuit breaker are connected in series to form a locking loop. And an isolation switch normally-closed auxiliary contact GN1 is connected in parallel at two ends of the closing button SBH.

The two ends of the control circuit power supply are an L end and an N end, and the control circuit small circuit breaker QF is arranged at the near end of one end.

The vacuum circuit breaker auxiliary contact DL1 on the closing loop is normally closed with the vacuum circuit breaker auxiliary contact DL3 on the closing loop, and the vacuum circuit breaker auxiliary contact DL2 on the opening loop is normally open.

The vacuum circuit breaker locking coil Y1 is interlocked with the vacuum circuit breaker closing button SBH for locking the vacuum circuit breaker closing button SBH when not energized and releasing the vacuum circuit breaker closing button SBH when energized.

The utility model discloses an interlock circuit, its theory of operation does:

when the isolating switch is not switched on, the locking loop is not electrified, and at the moment, the switching-on coil HQ of the vacuum circuit breaker is locked by the locking coil Y1 of the vacuum circuit breaker and cannot be switched on; even if the switch-on button is closed by the misoperation of switch-on, the state of the auxiliary contacts DL 1-DL 3 of the vacuum circuit breaker is switched, and the switching-off loop works under the connection of the normally closed auxiliary contact GN1 of the isolating switch, so that the vacuum circuit breaker is instantly switched off after the switching-off coil of the vacuum circuit breaker is electrified.

After the disconnecting switch is switched on, the normally closed auxiliary contact GN1 of the disconnecting switch is converted into a disconnected state, the normally open auxiliary contact GN2 of the disconnecting switch is closed, the vacuum circuit breaker locking coil Y1 is electrified to release the vacuum circuit breaker closing coil HQ, the closing button is pressed at the moment, the closing loop starts the vacuum circuit breaker to be smoothly switched on, the auxiliary contacts DL 1-DL 3 are converted, the closing coil can be prevented from being in an electrified state for a long time, and the service life of the vacuum circuit breaker coil is prolonged.

The utility model discloses an isolator and vacuum circuit breaker interlock circuit, it can guarantee just can close a floodgate to vacuum circuit breaker after the isolator is closed, and then prevents the maloperation.

Other parts not described in detail in the present invention belong to the prior art, and are not described herein again.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (1)

1. An interlocking circuit of a disconnecting switch and a vacuum circuit breaker comprises the disconnecting switch and the vacuum circuit breaker, and is characterized by also comprising a control circuit miniature circuit breaker; the vacuum circuit breaker is internally provided with a vacuum circuit breaker closing coil, a vacuum circuit breaker opening coil and a vacuum circuit breaker locking coil which are connected in parallel, and each coil is respectively connected with a vacuum circuit breaker auxiliary contact in series; the isolating switch comprises a main switch, an isolating switch normally closed auxiliary contact and an isolating switch normally open auxiliary contact; the vacuum circuit breaker locking coil is used for locking a closing button of the vacuum circuit breaker when the vacuum circuit breaker is not electrified and releasing the closing button of the vacuum circuit breaker when the vacuum circuit breaker is electrified;

between the control loop power supplies, a closing button, an auxiliary contact of the vacuum circuit breaker and a closing coil of the vacuum circuit breaker are connected in series to form a closing loop; a brake separating button, an auxiliary contact of the vacuum circuit breaker and a brake separating coil of the vacuum circuit breaker are connected in series to form a brake separating loop; the normally open auxiliary contact of the isolating switch, the auxiliary contact of the vacuum circuit breaker and the locking coil of the vacuum circuit breaker are connected in series to form a locking loop; the normally closed auxiliary contact of the isolating switch is connected in parallel with two ends of the closing button;

the vacuum circuit breaker auxiliary contacts on the closing loop and the closing loop are normally closed, and the vacuum circuit breaker auxiliary contacts on the opening loop are normally open; a control loop miniature circuit breaker is disposed proximate one end of the control loop power supply.

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