CN219553503U - Application structure of 6kV grounding disconnecting link in 0.4kV power distribution system - Google Patents

Abstract

The utility model provides an application structure of 6kV earthing knife-switch in 0.4kV distribution system, includes earthing knife-switch, earthing knife-switch one end and system's generating line electricity are connected, and the other end ground connection, the normal close auxiliary contact of earthing knife-switch inserts the closing control return circuit of inlet wire circuit breaker and forms electric shutting. The earthing knife-switch QE1 knife-switch is opened at ordinary times, at this moment, the normally closed auxiliary contact of earthing knife-switch is closed state for the return circuit of the control relay of inlet wire circuit breaker is electric under the power transmission condition that reaches, and the inlet wire circuit breaker can normally break-make or divide-shut brake, and after earthing knife-switch QE1 knife-switch was closed, the return circuit of the control relay of inlet wire circuit breaker was opened immediately, and the inlet wire circuit breaker can not normally close a floodgate, and the system is powered down immediately after having made a overhaul the ground connection, forms electric locking, guarantees personnel's safety.

Description

Application structure of 6kV grounding disconnecting link in 0.4kV power distribution system

Technical Field

The utility model relates to the technical field of power supply system equipment, in particular to an application structure of a 6kV grounding disconnecting link in a 0.4kV power distribution system.

Background

According to GB26860-2011 (regulations of electric safety regulations (electric part of power plant and substation)) 6.4.3, "when the equipment is identified to be voltage-free, the maintenance equipment should be grounded and three-phase short-circuited immediately", and when the maintenance of the electric equipment is required, the grounding must be performed.

When the 0.4kV power distribution system is overhauled, equipment is required to be reliably grounded in order to ensure the safety during overhauling, and more forms are adopted at present that a grounding wire is arranged on a 0.4kV bus; however, most of the current 0.4kV switch cabinets are fixedly separated, the bus chambers are independently separated, the bus is completely closed and inconvenient to open, the ground wire is inconvenient to hang or cannot be hung, the hung ground wire cannot be interlocked with electrical equipment, misoperation can occur, and malignant accidents of 'power transmission with the ground wire' are caused.

Disclosure of Invention

The utility model aims to solve the technical problem of providing an application structure of a 6kV grounding disconnecting link in a 0.4kV power distribution system, which is characterized in that the grounding disconnecting link applied to the 6kV power distribution cabinet in a mature mode is transferred to the 0.4kV power distribution cabinet for use, the grounding disconnecting link is arranged for a bus of the 0.4kV system, and the grounding disconnecting link is provided with mechanical locking and electric locking functions, so that equipment grounding work can be completed quickly during bus overhaul, and safety during bus overhaul is guaranteed.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides an application structure of 6kV earthing knife-switch in 0.4kV distribution system, includes earthing knife-switch, earthing knife-switch one end and system's generating line electricity are connected, and the other end ground connection, the normal close auxiliary contact of earthing knife-switch inserts the closing control return circuit of inlet wire circuit breaker and forms electric shutting.

The grounding disconnecting link is further provided with a mechanical lock, so that the grounding disconnecting link cannot be operated when the incoming line circuit breaker is in a closing state, and the grounding disconnecting link cannot be operated when the incoming line circuit breaker is in a separating state.

The structure of the mechanical locking of the grounding disconnecting link is as follows:

the grounding disconnecting link operation hole is opposite to the operation opening hole on the power distribution cabinet door, a grounding disconnecting link locking electromagnet is arranged between the grounding disconnecting link operation hole and the power distribution cabinet door, a rotating mechanism and a baffle plate driven by the rotating mechanism are arranged on the grounding disconnecting link locking electromagnet, the grounding disconnecting link locking electromagnet is controlled by an electromagnet control loop, and when the grounding disconnecting link locking electromagnet is powered on, the baffle plate is blocked between the operation opening hole and the grounding disconnecting link operation hole, so that the grounding disconnecting link cannot be operated.

The electromagnet control loop structure is as follows:

the three-phase electromagnetic switch comprises interphase voltage relays 1DY1 and DY2 connected between three-phase power supplies, and normally closed switches of the interphase voltage relays 1DY1 and DY2 are connected in series to a power supply loop of a grounding switch locking electromagnet coil DS1.

The application structure of the 6kV grounding disconnecting link in the 0.4kV power distribution system has the following beneficial effects:

1. the problem that a fully-closed bus structure of a 0.4kV power distribution system cannot be hung with a ground wire is solved;

2. the problem that the hanging ground wire cannot be locked with electrical equipment is solved.

Drawings

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic layout of a grounding switch;

fig. 3 is a schematic diagram of a closing loop of the line breaker connected to the auxiliary contact of the grounding disconnecting link QE 1;

FIG. 4 is a schematic diagram of a control loop for mechanical latching of the grounding switch QE 1;

fig. 5 is a schematic structural diagram of a mechanical lock of a grounding switch on a power distribution cabinet.

In the figure: the earthing knife-switch comprises an earthing knife-switch 1, an earthing knife-switch operation hole 2, an earthing knife-switch locking electromagnet 3, an incoming line breaker 4, a power distribution cabinet door 5, a baffle 6, an operation opening 7, interphase voltage relays 1DY1 and DY2 and an earthing knife-switch locking electromagnet coil DS1.

Detailed Description

As shown in fig. 1-5, the application structure of the 6kV grounding disconnecting link in the 0.4kV power distribution system comprises a grounding disconnecting link 1, one end of the grounding disconnecting link 1 is electrically connected with a system bus, the other end of the grounding disconnecting link is grounded, and a normally closed auxiliary contact of the grounding disconnecting link 1 is connected into a closing control loop of a wire inlet circuit breaker 4 to form electric locking.

One end of the grounding disconnecting link QE1 is connected with a bus of a 0.4kV system, the other end of the grounding disconnecting link QE1 is grounded, the grounding disconnecting link QE1 is disconnected when the system normally operates, at the moment, a normally closed auxiliary contact of the grounding disconnecting link 1 is in a closed state as shown in fig. 3, a loop of a control relay of the wire incoming circuit breaker 4 is powered on under the condition that power transmission is achieved, the wire incoming circuit breaker 4 can be normally switched on and off, after the grounding disconnecting link QE1 is closed, the loop of the control relay of the wire incoming circuit breaker 4 is immediately disconnected, the wire incoming circuit breaker 4 cannot be normally switched on, the system is immediately powered off after the system is overhauled and grounded, and electric locking is formed, so that personnel safety is ensured.

The earthing knife-switch 1 is also provided with a mechanical lock, so that the earthing knife-switch 1 can not be operated when the incoming line breaker 4 is in a closing state, and the earthing knife-switch 1 can only be operated when the incoming line breaker 4 is in a breaking state.

The structure of the mechanical locking of the grounding switch 1 is as follows:

as shown in fig. 2 and 5, the grounding switch operating hole 2 is opposite to the operating hole 7 on the distribution cabinet door 5, a grounding switch locking electromagnet 3 is arranged between the grounding switch operating hole 2 and the distribution cabinet door 5, a rotating mechanism and a baffle 6 driven by the rotating mechanism are arranged on the grounding switch locking electromagnet 3, the grounding switch locking electromagnet 3 is controlled by an electromagnet control loop, and when the grounding switch locking electromagnet 3 is powered on, the baffle 6 is blocked between the operating hole 7 and the grounding switch operating hole 2, so that the grounding switch 1 cannot be operated.

The electromagnet control loop structure is as follows:

the three-phase electromagnetic switch comprises interphase voltage relays 1DY1 and DY2 connected between three-phase power supplies, and normally closed switches of the interphase voltage relays 1DY1 and DY2 are connected in series to a power supply loop of a grounding switch locking electromagnet coil DS1.

As shown in fig. 4, 1DY1 and 1DY2 are voltage relays, when the voltage of the 0.4kV bus is detected, the power supplies A1, B1 and C1 are taken from the 0.4kV system bus, the voltage relays of 1DY1 and 1DY2 are electrically connected, and auxiliary contacts thereof are in an open state as shown in fig. 51DY1 and 1DY 2; when the 0.4kV bus is detected to be pressureless, the 1DY1 and 1DY2 voltage relays are released in a power-off mode, the auxiliary contacts 1DY1 and 1DY2 are in a closed state, the grounding knife locking electromagnet DS1 is excited and attracted, the grounding knife locking electromagnet can be opened to operate Kong Dangban in the state, the grounding knife operation hole is exposed, and the grounding knife switch is closed.

Examples:

the grounding disconnecting link which is used in the 6kV power distribution cabinet in a mature mode is transferred to the 0.4kV power distribution cabinet for use, the grounding disconnecting link is arranged for a 0.4kV system bus, and the grounding disconnecting link is provided with mechanical locking and electric locking functions, so that equipment grounding work can be completed quickly when the bus is overhauled, and safety when the bus is overhauled is guaranteed.

The set of devices comprises: one set of grounding knife switch, as shown in figure 1 QE1, one locking electromagnet, one linkage shaft, one grounding knife operation hole baffle plate and two voltage relays.

1. Structure of grounding knife switch

The grounding disconnecting link is provided in a complete set of components, comprising a set of preassembled moving contact systems and corresponding grounding fixed contacts, and the components are correctly installed on a switch cabinet, thus forming a set of grounding disconnecting link with complete functions. The grounding disconnecting link is provided with 3 pairs of movable contacts arranged on the main shaft and can freely rotate. The movable contacts are mutually communicated through a short-circuit bridge, are grounded through two annealed copper wires fixed on the support, and are arranged on a transmission main shaft of the support and are used for transmitting force generated in the opening and closing process.

2. Locking of grounding knife switch

The circuit breaker and the grounding disconnecting link can be electrically locked through an electric secondary circuit or mechanically locked through an operation hole,

1) Electric locking: the grounding disconnecting link QE1 is provided with a group of auxiliary normally closed contacts, the auxiliary normally closed contacts are connected into a closing loop of the incoming line circuit breaker, and when the grounding disconnecting link is in a disconnecting state, the auxiliary contacts are in a closing state, and the incoming line circuit breaker can normally close at the moment; if the grounding disconnecting link is in a closing state, namely, the 0.4kV power distribution system bus is in a grounding maintenance state, an auxiliary contact of the grounding disconnecting link is in an opening state, and at the moment, the incoming line circuit breaker cannot be closed, so that an electric locking effect is achieved.

2, mechanical locking: the earthing knife switch, abbreviated as 'earthing knife', is operated and needs to reserve an operation hole in a corresponding cabinet door of the power distribution cabinet, the operation hole is provided with a mechanical baffle which is matched with an earthing knife locking electromagnet for use, when the earthing knife locking electromagnet is excited, the mechanical baffle can be opened, the earthing knife operation hole is exposed, and an earthing knife operation handle can be inserted into the hole to complete the opening or closing of the earthing knife switch and can be operated.

As shown in the figure, 1DY1 and 1DY2 are voltage relays, when the voltage of the 0.4kV bus is detected, the power supplies A1, B1 and C1 are taken from the 0.4kV system bus, the voltage relays of 1DY1 and 1DY2 are electrically attracted, and auxiliary contacts of the voltage relays are in an open state as shown in fig. 41DY1 and 1DY 2; when the 0.4kV bus is detected to be pressureless, the 1DY1 and 1DY2 voltage relays are released in a power-off mode, the auxiliary contacts 1DY1 and 1DY2 are in a closed state, the grounding knife locking electromagnet DS1 is excited and attracted, the grounding knife locking electromagnet can be opened to operate Kong Dangban in the state, the grounding knife operation hole is exposed, and the grounding knife switch is closed.

Claims (4)

1. An application structure of a 6kV grounding disconnecting link in a 0.4kV power distribution system is characterized in that: the electric locking device comprises a grounding disconnecting link (1), wherein one end of the grounding disconnecting link (1) is electrically connected with a system bus, the other end of the grounding disconnecting link is grounded, and a normally closed auxiliary contact of the grounding disconnecting link (1) is connected with a closing control loop of a wire inlet circuit breaker (4) to form electric locking.

2. The application structure of the 6kV grounding disconnecting link in the 0.4kV power distribution system according to claim 1, wherein the grounding disconnecting link (1) is further provided with a mechanical lock, so that the grounding disconnecting link (1) cannot be operated when the incoming line circuit breaker (4) is in a closing state, and the grounding disconnecting link (1) cannot be operated when the incoming line circuit breaker (4) is in a disconnecting state.

3. The application structure of the 6kV grounding disconnecting link in the 0.4kV power distribution system according to claim 2, wherein the structure of the mechanical locking of the grounding disconnecting link (1) is as follows:

the earthing knife-switch operating hole (2) is opposite to an operating hole (7) on the power distribution cabinet door (5), an earthing knife-switch locking electromagnet (3) is arranged between the earthing knife-switch operating hole (2) and the power distribution cabinet door (5), a rotating mechanism and a baffle plate (6) driven by the rotating mechanism are arranged on the earthing knife-switch locking electromagnet (3), the earthing knife-switch locking electromagnet (3) is controlled by an electromagnet control loop, and when the earthing knife-switch locking electromagnet (3) is powered on, the baffle plate (6) is blocked between the operating hole (7) and the earthing knife-switch operating hole (2), so that the earthing knife-switch (1) cannot operate.

4. The application structure of the 6kV grounding disconnecting link in the 0.4kV power distribution system according to claim 3, wherein the electromagnet control loop structure is as follows:

the three-phase electromagnetic switch comprises interphase voltage relays 1DY1 and DY2 connected between three-phase power supplies, and normally closed switches of the interphase voltage relays 1DY1 and DY2 are connected in series to a power supply loop of a grounding switch locking electromagnet coil DS1.