CN217882818U - Circuit breaker control interlocking circuit of primary equipment double-bus wiring in transformer substation - Google Patents

Abstract

The utility model relates to a circuit breaker control interlock circuit of two bus connection of primary equipment in transformer substation, including first isolator, second isolator, third isolator and circuit breaker, first isolator's one end and first bus connection, second isolator's one end and second bus connection, first isolator with second isolator in addition one end respectively with the one end of circuit breaker is connected, the other end of circuit breaker is connected third isolator's one end, transmission line and load are connected to the other end of third isolator. The utility model discloses a judge that circuit breaker both sides isolator is in closing the position simultaneously or is in the branch position simultaneously, open circuit breaker control circuit, can effectively avoid the malignant electrical maloperation of "taking the ground wire" power transmission, first isolator, second isolator, third isolator are furnished with the auxiliary contact group simultaneously, introduce redundant mechanism, avoid influencing circuit breaker divide-shut brake operation because of single contact damages.

Description

Circuit breaker control interlocking circuit of primary equipment double-bus wiring in transformer substation

Technical Field

The utility model belongs to the technical field of transformer fortune dimension professional technique and specifically relates to a circuit breaker control interlock circuit of two bus-bar connection of primary equipment in transformer substation is related to.

Background

The transformer substation is a place for converting voltage and current, receiving electric energy and distributing electric energy in an electric power system. The disconnecting link is an important device in the transformer substation, is also called as an isolating switch, can conduct load current when in operation, plays a role in isolating voltage when equipment is overhauled, and has important significance for ensuring normal and safe work of the transformer substation.

The isolating switch, especially the bus isolating switch, not only belongs to the switch interval equipment and simultaneously connects with the bus and the breaker, the interlocking relationship generally exists between the breaker and the isolating switch of the current power system operation, but the wiring is not reasonable, in the closing interlocking loop of the breaker, the bus side isolating switch and the line side isolating switch are both at the closing position, are both at the opening position or are one at the opening position and the other at the closing position, the opening and closing of the breaker can be controlled, when the ground wire is hung on any one side of the breaker, the other side isolating switch is at the closing position, if the breaker is closed again, the vicious electrical misoperation event with the ground wire power transmission can be caused, and the great hidden danger is brought to the power grid operation.

SUMMERY OF THE UTILITY MODEL

The utility model provides a circuit breaker control interlock circuit of primary equipment double bus wiring in reasonable transformer substation of working a telephone switchboard to guarantee the reliability of staff's maloperation.

The utility model provides a its technical problem take following technical scheme to realize:

the utility model provides a circuit breaker control interlock circuit of two generating lines of primary equipment wiring in transformer substation, including first isolator, second isolator, third isolator and circuit breaker, first isolator's one end is connected with first generating line, second isolator's one end is connected with the second generating line, first isolator with the other one end of second isolator respectively with the one end of circuit breaker is connected, the other end of circuit breaker is connected the one end of third isolator, the other end of third isolator is connected transmission line and load, first generating line passes through first isolator, circuit breaker and third isolator supplies power to the load, the second generating line passes through second isolator, circuit breaker and third isolator supplies power to the load;

the first isolating switch, the second isolating switch and the third isolating switch are respectively provided with an auxiliary contact group,

one end of an auxiliary contact group of the first isolating switch is connected with the positive electrode of a direct-current power supply of a transformer substation, the other end of the auxiliary contact group of the first isolating switch is connected with one end of an auxiliary contact group of the second isolating switch, the other end of the auxiliary contact group of the second isolating switch is connected with one end of an auxiliary contact group of the third isolating switch, the other end of the auxiliary contact group of the third isolating switch is connected with the negative electrode of the direct-current power supply of the transformer substation through an interlocking relay, and the auxiliary contact groups of the first isolating switch, the second isolating switch and the third isolating switch are matched for opening a control loop of the circuit breaker when the circuit breaker is subjected to power transmission or power failure maintenance;

the auxiliary contact group of the first isolating switch comprises a first group of normally open contacts of the first isolating switch, a second group of normally open contacts of the first isolating switch, a first group of normally closed contacts of the first isolating switch, a second group of normally closed contacts of the first isolating switch, a third group of normally closed contacts of the first isolating switch and a fourth group of normally closed contacts of the first isolating switch,

the auxiliary contact group of the second isolating switch comprises a first group of normally open contacts of the second isolating switch, a second group of normally open contacts of the second isolating switch, a first group of normally closed contacts of the second isolating switch, a second group of normally closed contacts of the second isolating switch, a third group of normally closed contacts of the second isolating switch and a fourth group of normally closed contacts of the second isolating switch,

the auxiliary contact group of the third isolating switch comprises a first group of normally open contacts of the third isolating switch, a second group of normally open contacts of the third isolating switch, a third group of normally closed contacts of the third isolating switch and a fourth group of normally closed contacts of the third isolating switch.

Preferably, one end of the first group of normally open contacts of the first isolating switch and one end of the second group of normally open contacts of the first isolating switch are connected with the positive pole of the direct-current power supply of the transformer substation, the other end of the first group of normally open contacts of the first isolating switch and the other end of the second group of normally open contacts of the first isolating switch are connected with each other and are respectively connected with one end of the first group of normally closed contacts of the second isolating switch and one end of the second group of normally closed contacts of the second isolating switch,

the other ends of the first group of normally closed contacts of the second isolating switch and the second group of normally closed contacts of the second isolating switch are connected and are respectively connected with one ends of the first group of normally open contacts of the second isolating switch, the second group of normally open contacts of the second isolating switch, the first group of normally open contacts of the third isolating switch and the second group of normally open contacts of the third isolating switch, the other ends of the first group of normally open contacts of the third isolating switch and the second group of normally open contacts of the third isolating switch are connected and are respectively connected with the negative pole of the direct-current power supply of the transformer substation through an interlocking relay,

the other ends of the first group of normally open contacts of the second isolating switch and the second group of normally open contacts of the second isolating switch are connected and are respectively connected with one ends of the first group of normally closed contacts of the first isolating switch and the second group of normally closed contacts of the first isolating switch, the other ends of the first group of normally closed contacts of the first isolating switch and the second group of normally closed contacts of the first isolating switch are connected with the positive pole of the direct-current power supply of the transformer substation,

the transformer substation direct-current power supply is characterized in that one ends of a third group of normally closed contacts of the first isolating switch and a third group of normally closed contacts of the first isolating switch are connected with the positive electrode of the direct-current power supply of the transformer substation, the other ends of the third group of normally closed contacts of the first isolating switch and the third group of normally closed contacts of the first isolating switch are connected with each other and are respectively connected with one ends of the third group of normally closed contacts of the second isolating switch and the fourth group of normally closed contacts of the second isolating switch, the other ends of the third group of normally closed contacts of the second isolating switch and the fourth group of normally closed contacts of the second isolating switch are connected with each other and are respectively connected with one ends of the third group of normally closed contacts of the third isolating switch and the fourth group of normally closed contacts of the third isolating switch, and the other ends of the third group of normally closed contacts of the third isolating switch and the fourth group of the third isolating switch are connected with the negative electrode of the direct-current power supply of the transformer substation through a linkage relay.

The utility model has the advantages that:

the utility model relates to a circuit breaker control interlock circuit of primary equipment double bus wiring in transformer substation borrows the operating principle that before closing the disconnecting switch, the earthing wire is necessarily removed first or the earthing switch is separated, and the circuit breaker control loop is opened by judging whether the disconnecting switches on the two sides of the circuit breaker are in the closing position or in the separating position at the same time, so that the vicious electrical misoperation event of 'grounding wire' power transmission can be effectively avoided; meanwhile, the first isolating switch, the second isolating switch and the third isolating switch are provided with auxiliary contact sets, a redundancy mechanism is introduced, and the condition that the opening and closing operation of the circuit breaker is influenced due to the damage of a single contact is avoided.

Drawings

Fig. 1 is an overall connection schematic diagram of the circuit breaker control interlock circuit of the double bus connection of the present invention;

fig. 2 is a schematic diagram of the interlocking relationship between the circuit breaker and the disconnecting switch of the present invention;

fig. 3 is a schematic diagram of a circuit breaker and a disconnector according to the prior art.

Detailed Description

The utility model provides a circuit breaker control interlock circuit of primary equipment double bus wiring in transformer substation, as shown in figure 1 and figure 2, comprising a first isolating switch, a second isolating switch, a third isolating switch and a circuit breaker, wherein one end of the first isolating switch is connected with a first bus, one end of the second isolating switch is connected with a second bus, the other ends of the first isolating switch and the second isolating switch are respectively connected with one end of the circuit breaker, the other end of the circuit breaker is connected with one end of the third isolating switch, the other end of the third isolating switch is connected with a power transmission line and a load, the first bus supplies power to the load through the first isolating switch, the circuit breaker and the third isolating switch, the second bus supplies power to the load through the second isolating switch, the circuit breaker and the third isolating switch, one of the two power supply modes is selected under the normal power supply mode,

the first isolating switch, the second isolating switch and the third isolating switch are respectively provided with an auxiliary contact group,

one end of an auxiliary contact group of the first isolating switch is connected with the positive electrode of a direct-current power supply of a transformer substation, the other end of the auxiliary contact group of the first isolating switch is connected with one end of an auxiliary contact group of the second isolating switch, the other end of the auxiliary contact group of the second isolating switch is connected with one end of an auxiliary contact group of the third isolating switch, the other end of the auxiliary contact group of the third isolating switch is connected with the negative electrode of the direct-current power supply of the transformer substation through an interlocking relay, and the auxiliary contact group of the first isolating switch, the auxiliary contact group of the second isolating switch and the auxiliary contact group of the third isolating switch are matched for opening a control loop of the circuit breaker when the circuit breaker is used for power transmission or power failure maintenance;

the auxiliary contact group of the first isolating switch comprises a first group of normally open contacts of the first isolating switch, a second group of normally open contacts of the first isolating switch, a first group of normally closed contacts of the first isolating switch, a second group of normally closed contacts of the first isolating switch, a third group of normally closed contacts of the first isolating switch and a fourth group of normally closed contacts of the first isolating switch,

the auxiliary contact group of the second isolating switch comprises a first group of normally open contacts of the second isolating switch, a second group of normally open contacts of the second isolating switch, a first group of normally closed contacts of the second isolating switch, a second group of normally closed contacts of the second isolating switch, a third group of normally closed contacts of the second isolating switch and a fourth group of normally closed contacts of the second isolating switch,

and the auxiliary contact group of the third isolating switch comprises a first group of normally open contacts of the third isolating switch, a second group of normally open contacts of the third isolating switch, a third group of normally closed contacts of the third isolating switch and a fourth group of normally closed contacts of the third isolating switch.

In this embodiment, one end of the first group of normally open contacts of the first isolating switch and one end of the second group of normally open contacts of the first isolating switch are connected with the positive electrode of the direct-current power supply of the transformer substation, the other end of the first group of normally open contacts of the first isolating switch and the other end of the first group of normally open contacts of the first isolating switch are connected with one end of the first group of normally closed contacts of the second isolating switch and one end of the second group of normally closed contacts of the second isolating switch respectively,

the other ends of the first group of normally closed contacts of the second isolating switch and the second group of normally closed contacts of the second isolating switch are connected and are respectively connected with one ends of the first group of normally open contacts of the second isolating switch, the second group of normally open contacts of the second isolating switch, the first group of normally open contacts of the third isolating switch and the second group of normally open contacts of the third isolating switch, the other ends of the first group of normally open contacts of the third isolating switch and the second group of normally open contacts of the third isolating switch are connected and are respectively connected with the negative pole of the direct-current power supply of the transformer substation through an interlocking relay,

the other ends of the first group of normally open contacts of the second isolating switch and the second group of normally open contacts of the second isolating switch are connected and are respectively connected with one ends of the first group of normally closed contacts of the first isolating switch and the second group of normally closed contacts of the first isolating switch, the other ends of the first group of normally closed contacts of the first isolating switch and the second group of normally closed contacts of the first isolating switch are connected with the positive pole of the direct-current power supply of the transformer substation,

the transformer substation direct-current power supply is characterized in that one ends of a third group of normally closed contacts of the first isolating switch and a third group of normally closed contacts of the first isolating switch are connected with the positive pole of the transformer substation direct-current power supply, the other ends of the third group of normally closed contacts of the first isolating switch and the third group of normally closed contacts of the first isolating switch are connected with each other and are respectively connected with one ends of the third group of normally closed contacts of the second isolating switch and the fourth group of normally closed contacts of the second isolating switch, the other ends of the third group of normally closed contacts of the second isolating switch and the fourth group of normally closed contacts of the second isolating switch are connected with each other and are respectively connected with one ends of the third group of normally closed contacts of the third isolating switch and the fourth group of normally closed contacts of the third isolating switch, and the other ends of the third group of normally closed contacts of the third isolating switch and the fourth group of normally closed contacts of the third isolating switch are connected with the negative pole of the transformer substation direct-current power supply through a linkage relay.

The working principle is as follows:

when the loop among the first isolating switch, the second isolating switch and the third isolating switch is connected, the control loop of the circuit breaker is opened,

under the condition of meeting the power transmission requirement of equipment, a first group of normally open contacts of the first isolating switch and a second group of normally open contacts of the first isolating switch are closed, a first group of normally closed contacts of the second isolating switch and a second group of normally closed contacts of the second isolating switch are closed, a first group of normally open contacts of the third isolating switch and a second group of normally open contacts of the third isolating switch are closed, and the opening and closing loop of the circuit breaker is opened;

under the condition of meeting the power transmission requirement of equipment, a first group of normally closed contacts of the first isolating switch and a second group of normally closed contacts of the first isolating switch are closed, a first group of normally open contacts of the second isolating switch and a second group of normally open contacts of the second isolating switch are closed, a first group of normally open contacts of the third isolating switch and a second group of normally open contacts of the third isolating switch are closed, and the opening and closing loop of the circuit breaker is opened;

under the condition that needs have a power failure to overhaul equipment, first isolator third group normally closed contact and first isolator fourth group normally closed contact are closed, second isolator third group normally closed contact and second isolator fourth group normally closed contact are closed, third isolator third group normally closed contact, third isolator fourth group normally closed contact are closed, realize opening circuit breaker's divide-shut brake return circuit.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific installation and working processes of the above-described apparatus may refer to the corresponding processes in the above-described embodiments, and are not described herein again.

First, it should be noted that the specific structure, features, advantages, etc. of the present invention will be specifically described below by way of example, but all the descriptions are only for illustrative purposes and should not be construed as forming any limitation on the present invention. Furthermore, any individual technical features described or implicit in the embodiments mentioned herein may continue to be combined or subtracted between any of these technical features (or their equivalents) to obtain still further embodiments of the present invention that may not be directly mentioned herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and furthermore, the terms "comprise" and "have" and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be emphasized that the embodiments described herein are illustrative and not restrictive, and thus the present invention includes but is not limited to the embodiments described in the detailed description, as well as other embodiments derived from the technical solutions of the present invention by those skilled in the art, which also belong to the scope of the present invention.

Claims (2)

1. The utility model provides a circuit breaker control interlock circuit of primary equipment double bus wiring in transformer substation which characterized in that: the power supply system comprises a first isolating switch, a second isolating switch, a third isolating switch and a circuit breaker, wherein one end of the first isolating switch is connected with a first bus, one end of the second isolating switch is connected with a second bus, the other ends of the first isolating switch and the second isolating switch are respectively connected with one end of the circuit breaker, the other end of the circuit breaker is connected with one end of the third isolating switch, the other end of the third isolating switch is connected with a power transmission line and a load, the first bus supplies power to the load through the first isolating switch, the circuit breaker and the third isolating switch, and the second bus supplies power to the load through the second isolating switch, the circuit breaker and the third isolating switch;

the first isolating switch, the second isolating switch and the third isolating switch are respectively provided with an auxiliary contact group,

one end of an auxiliary contact group of the first isolating switch is connected with the positive electrode of a direct-current power supply of a transformer substation, the other end of the auxiliary contact group of the first isolating switch is connected with one end of an auxiliary contact group of the second isolating switch, the other end of the auxiliary contact group of the second isolating switch is connected with one end of an auxiliary contact group of the third isolating switch, the other end of the auxiliary contact group of the third isolating switch is connected with the negative electrode of the direct-current power supply of the transformer substation through an interlocking relay, and the auxiliary contact groups of the first isolating switch, the second isolating switch and the third isolating switch are matched for opening a control loop of the circuit breaker when the circuit breaker is subjected to power transmission or power failure maintenance;

the auxiliary contact group of the first isolating switch comprises a first group of normally open contacts of the first isolating switch, a second group of normally open contacts of the first isolating switch, a first group of normally closed contacts of the first isolating switch, a second group of normally closed contacts of the first isolating switch, a third group of normally closed contacts of the first isolating switch and a fourth group of normally closed contacts of the first isolating switch,

the auxiliary contact group of the second isolating switch comprises a first group of normally open contacts of the second isolating switch, a second group of normally open contacts of the second isolating switch, a first group of normally closed contacts of the second isolating switch, a second group of normally closed contacts of the second isolating switch, a third group of normally closed contacts of the second isolating switch and a fourth group of normally closed contacts of the second isolating switch,

the auxiliary contact group of the third isolating switch comprises a first group of normally open contacts of the third isolating switch, a second group of normally open contacts of the third isolating switch, a third group of normally closed contacts of the third isolating switch and a fourth group of normally closed contacts of the third isolating switch.

2. The substation primary equipment double-bus-connected circuit breaker control interlock circuit according to claim 1, characterized in that: one end of the first group of normally open contacts of the first isolating switch and one end of the second group of normally open contacts of the first isolating switch are connected with the positive pole of the direct-current power supply of the transformer substation, the other ends of the first group of normally open contacts of the first isolating switch and the second group of normally open contacts of the first isolating switch are connected with each other and are respectively connected with one end of the first group of normally closed contacts of the second isolating switch and one end of the second group of normally closed contacts of the second isolating switch,

the other ends of the first group of normally closed contacts of the second isolating switch and the second group of normally closed contacts of the second isolating switch are connected and are respectively connected with one ends of the first group of normally open contacts of the second isolating switch, the second group of normally open contacts of the second isolating switch, the first group of normally open contacts of the third isolating switch and the second group of normally open contacts of the third isolating switch, the other ends of the first group of normally open contacts of the third isolating switch and the second group of normally open contacts of the third isolating switch are connected and are respectively connected with the negative pole of the direct-current power supply of the transformer substation through an interlocking relay,

the other ends of the first group of normally open contacts of the second isolating switch and the second group of normally open contacts of the second isolating switch are connected and respectively connected with one ends of the first group of normally closed contacts of the first isolating switch and the second group of normally closed contacts of the first isolating switch, the other ends of the first group of normally closed contacts of the first isolating switch and the second group of normally closed contacts of the first isolating switch are connected with the positive pole of the direct-current power supply of the transformer substation,

the transformer substation direct-current power supply is characterized in that one ends of a third group of normally closed contacts of the first isolating switch and a third group of normally closed contacts of the first isolating switch are connected with the positive electrode of the direct-current power supply of the transformer substation, the other ends of the third group of normally closed contacts of the first isolating switch and the third group of normally closed contacts of the first isolating switch are connected with each other and are respectively connected with one ends of the third group of normally closed contacts of the second isolating switch and the fourth group of normally closed contacts of the second isolating switch, the other ends of the third group of normally closed contacts of the second isolating switch and the fourth group of normally closed contacts of the second isolating switch are connected with each other and are respectively connected with one ends of the third group of normally closed contacts of the third isolating switch and the fourth group of normally closed contacts of the third isolating switch, and the other ends of the third group of normally closed contacts of the third isolating switch and the fourth group of the third isolating switch are connected with the negative electrode of the direct-current power supply of the transformer substation through a linkage relay.

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