CN210693223U - A voltage transformer isolation combined device applied to non-power-off operation - Google Patents

Abstract

The utility model discloses a voltage transformer isolation combined device applied to non-power-off operation, comprising an overhead line wiring block, a grounding inspection pole, a lower terminal of the overhead line, an upper terminal of a vacuum circuit breaker, a pillar arrester, and the installation of the combined device Columns, insulating pillars, isolation switches, upper terminals of voltage transformers and fully insulated protective suits, the lower terminals of the overhead line, one end of the grounding inspection pole, and one end of the pillar arrester are connected to the overhead lines in order from top to bottom. The vertical parts of the terminal block are connected; the upper terminal of the vacuum circuit breaker is arranged on the first inclined part of the overhead line terminal block; the post arrester is provided with a fault detachment indicator. The voltage transformer isolation combined device of the utility model applied to the uninterrupted operation has the characteristics of simple and convenient construction, safety and reliability, and high efficiency, and meets the uninterrupted replacement requirements of the secondary equipment such as the voltage transformer.

Description

A voltage transformer isolation combined device applied to non-power-off operation

technical field

The utility model relates to an isolation combined device of a voltage transformer which is applied to non-power-off operation.

Background technique

A vacuum circuit breaker is a combination of a load switch and a fuse. In the power grid, the main functions of circuit breakers have two aspects: (1) Control function: that is, according to the operation needs, put in or cut off part of the power equipment or lines. (2) Protection function: that is, when the power equipment or line fails, the relay protection and automatic devices act on the circuit breaker to quickly remove the faulty part from the power grid to ensure the normal operation of the non-faulty part of the power grid. Replacing the on-column switch is mainly because the on-column switch cannot achieve short-circuit protection; in addition, the traditional on-column switch does not have the "three remote" function, and cannot realize the construction of primary and secondary integrated smart grid, that is, the construction requirements of "ubiquitous power Internet of things".

According to the construction requirements of "Ubiquitous Power Internet of Things", an important terminal equipment used by power companies on 10kV distribution overhead lines is the column vacuum circuit breaker, which can realize the functions of voltage and current acquisition, fault judgment, and remote switching operation. .

However, the vacuum circuit breaker device on the column is equipped with a parallel voltage transformer. According to the requirements of the "Circuit Part of the Electric Power Safety Work Regulations of the State Grid Corporation", it is forbidden to connect or disconnect the transformer equipment with electricity. At present, it involves the maintenance, technical transformation, and elimination of vacuum circuit breakers. One is to use isolation switches to isolate and cut off power in the maintenance line section, and the other is to conduct power outages for the entire line. Both methods are inconsistent with the current power companies' efforts to develop uninterrupted operations, reduce user power outages, and improve the reliability of power supply, and do not meet the high-quality development requirements of power companies.

At the same time, with the installation and replacement of a large number of vacuum circuit breakers, the problem of voltage transformer failure also occurs from time to time. The installation of vacuum circuit breaker and voltage transformer on the column currently requires the line to be in a power outage state, resulting in an increase in the number of line outages. However, in order to replace the faulty voltage transformer, according to the safety work regulations, the number of line power outages and the duration of power outages will inevitably increase, and the waiting time and complaint rate of equipment users will increase, which will seriously affect the power supply service quality of the power company.

Therefore, it is necessary to study the key technologies of uninterrupted connection and disconnection of voltage transformers as soon as possible, and develop an isolation combined device for 10kV column vacuum load circuit breaker voltage transformers with electrical and mechanical properties that meet the requirements, so as to fundamentally meet the requirements of uninterrupted lines. , The line is charged to replace the requirements of equipment such as voltage transformers.

Utility model content

The purpose of the utility model is to overcome the defects of the prior art, and to provide a voltage transformer isolation combined device for non-power-off operation, which is stable and reliable, does not affect the installation structure of the original line equipment, and has the advantages of simple and convenient construction, safety and reliability, High efficiency, to meet the needs of uninterrupted replacement of secondary equipment such as voltage transformers.

The technical scheme for realizing the above purpose is: a voltage transformer isolation combined device for non-stop operation, comprising an overhead line terminal block, a grounding inspection pole, a lower terminal of the overhead line, an upper terminal of a vacuum circuit breaker, a pillar arrester, Combination device mounting post, insulating post, isolating switch, upper terminal of voltage transformer and fully insulated protective suit, including:

The overhead line wiring row is formed by connecting a vertical part, a first inclined part and a second inclined part in sequence;

The lower terminal of the overhead line, one end of the grounding inspection pole, and one end of the pillar arrester are sequentially connected with the vertical part of the overhead line wiring row from top to bottom;

The upper terminal of the vacuum circuit breaker is arranged on the first inclined portion of the overhead line wiring row;

The pillar arrester is arranged horizontally, and a fault detachment indicator is arranged on the pillar arrester;

The mounting post of the combination device is arranged at the other end of the post arrester, and the end of the post arrester is respectively connected with the upper end of the insulating post and the fault detachment indicator;

The upper terminal of the voltage transformer is arranged at the lower end of the insulating support;

One end of the isolation knife switch is connected with the lower end of the insulating support, and the other end is connected with the second inclined portion of the overhead line wiring row;

The fully insulated protective suit includes an insulating protective cover for an overhead wire terminal block, a knife switch insulation protective cover, a transformer wiring insulation protective cover and a disconnector insulation protective cover, and the overhead wire terminal block insulation protective cover is wrapped around the overhead wire wiring the outside of the row; the insulation shield of the knife switch is wrapped on the outside of the isolation switch; the insulation shield of the transformer wiring is wrapped on the outside of the upper terminal of the voltage transformer; the insulating shield of the disconnector is wrapped in The fault is removed from the outside of the indicator.

The above-mentioned voltage transformer isolation combination device for non-power-off operation, wherein the other end of the pillar arrester is provided with a connecting piece, and the connecting piece is vertically arranged; the upper end of the insulating support is connected to the connecting piece The lower end of the connecting piece is connected, and the fault detachment indicator is connected with the upper end of the connecting piece.

The above-mentioned isolation combination device for voltage transformers for non-power-off operation, wherein the lower end of the insulating support is connected to the upper terminal of the voltage transformer through a terminal board; The terminals and terminal blocks of the voltage transformer are wrapped in it.

The above-mentioned isolation combination device for voltage transformers applied to non-power-off operation, wherein the overhead line terminal block insulation shield wraps the overhead line terminal block, the overhead line lower terminal and the vacuum circuit breaker upper terminal. within it.

In the above-mentioned voltage transformer isolation combination device for non-power-off operation, the grounding inspection pole and the pillar arrester are respectively arranged on both sides of the vertical part of the overhead line wiring bar.

The voltage transformer isolation combined device of the utility model is stable and reliable, does not affect the installation structure of the original line equipment, and has the characteristics of simple and convenient construction, safety and reliability, and high efficiency, and can meet the requirements of secondary equipment such as voltage transformers. non-stop replacement needs.

Description of drawings

Fig. 1 is the structure diagram of the voltage transformer isolation combined device applied to non-stop operation of the present invention;

FIG. 2 is a structural diagram of a fully insulated protective suit for a voltage transformer isolation combined device for non-power-off operation according to the present invention.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the specific embodiments thereof will be described in detail below in conjunction with the accompanying drawings:

Please refer to FIG. 1 and FIG. 2 , the preferred embodiment of the present utility model, a voltage transformer isolation combined device for non-stop operation, includes an overhead line terminal block 11, a grounding inspection pole 1, and an overhead line lower terminal 2. The upper terminal 3 of the vacuum circuit breaker, the pillar arrester 4, the combined device installation pillar 6, the insulating pillar 7, the isolation knife switch 8, the upper terminal 9 of the voltage transformer and the full insulation protective suit.

The overhead line terminal block 11 is formed by connecting a vertical part, a first inclined part and a second inclined part in sequence. The grounding inspection pole 2 and the pillar arrester 4 are respectively arranged on both sides of the vertical part of the overhead line connection row 11 . The lower terminal 2 of the overhead line, one end of the grounding inspection pole 1, and one end of the pillar arrester 4 are sequentially connected to the vertical part of the overhead line terminal block 11 from top to bottom; the upper terminal 3 of the vacuum circuit breaker is arranged on the overhead line terminal block. On the first inclined part of 11; the pillar arrester 4 is arranged laterally, and the pillar arrester 4 is provided with a fault detachment indicator 5; the combination device mounting column 6 is arranged on the other end of the pillar arrester 4, and this end of the pillar arrester is provided with a connecting piece 12. The connecting piece 12 is arranged vertically; the upper end of the insulating support 7 is connected with the lower end of the connecting piece 12, and the fault detachment indicator 5 is connected with the upper end of the connecting piece 12.

The lower end of the insulating support 7 is connected to the upper terminal 9 of the voltage transformer through the terminal board 13 . One end of the isolation knife switch 8 is connected to the lower end of the insulating support 7 , and the other end is connected to the second inclined portion of the overhead line terminal block 11 .

The full insulation protection set includes the overhead line terminal block insulation cover 101, the knife gate insulation cover 102, the transformer wiring insulation cover 103 and the disconnector insulation cover 104, the overhead line terminal block insulation cover 101 The overhead line terminal block 11 , the lower terminal 2 of the overhead line and the upper terminal 3 of the vacuum circuit breaker are wrapped in it. The knife switch insulation shield 102 is wrapped outside the isolation switch 8; the transformer wiring insulation shield 103 wraps the upper terminal 9 and the terminal board 13 of the voltage transformer in it; the disconnector insulation shield 104 is wrapped in the fault disconnection indicator outside of device 5.

When the utility model is used for the isolation combination device of voltage transformers for non-power-off operation, when in use, the grounding inspection pole 1 is used for hanging the grounding wire when the overhead line is powered off for maintenance. The lower terminal 2 of the overhead line is connected to the down conductor of the overhead line cable. The upper terminal 3 of the vacuum circuit breaker is connected to the high voltage terminal of the vacuum circuit breaker. The pillar arrester 4 is used for lightning overvoltage and operating overvoltage protection, and can cut off the power frequency freewheeling current generated by the overvoltage in time, protect the equipment on the line (voltage transformer and vacuum circuit breaker, etc.), and provide the entire combined device. Mechanical support is much better than ordinary line arresters in terms of mechanical strength. The fault detachment indicator 5 is used to prevent the ground fault of the power grid system caused by the electrical performance failure of the pillar arrester 4, as an instant detachment to protect the normal operation of the grid, and to provide a fault indication; the pillar arrester 4 can still be used as a pillar after an electrical fault. Insulators provide mechanical support. The combination device mounting column 6 is used for the entire combination device to be installed on the line cross arm. The insulating support 7 is used to support the lower contact of the isolation switch 8 and the upper terminal 9 of the voltage transformer.

The isolation knife switch 8 is an important part of the combined device, which is specially used for the live replacement of the voltage transformer of the vacuum circuit breaker on the column. The overhead line is not powered off, the isolation switch 8 is opened, and the faulty voltage transformer can be replaced after the isolation switch 8 is disconnected to form an obvious isolation fracture. After the faulty voltage transformer is replaced, the isolation switch 8 is closed again to complete the whole set of live construction work, which provides a reliable guarantee for the long-term effective operation of the power grid.

The upper terminal 9 of the voltage transformer is connected to the high voltage end of the voltage transformer. During the replacement of the voltage transformer, the isolation knife switch 8 is opened, the terminal 9 on the voltage transformer is not charged, and the cable connected to the terminal 9 on the voltage transformer is not charged, and only the high voltage terminal of the voltage transformer can be removed. The solution operation can be done.

The full-insulation protection suit provides insulation protection for all the high-voltage exposed metal parts of the isolation combination device of the present invention, which not only provides reliable insulation protection for the operation of live switching on and off and the operation of replacing the voltage transformer after switching on, but also provides reliable insulation protection. As a long-term and effective anti-break protection means for the combined device.

The voltage transformer isolation combined device of the utility model applied to non-power-off operation has the following advantages:

(1) In the process of replacing the load switch on the column with the vacuum circuit breaker on the column, the problem of fault replacement of the voltage transformer on the column encountered in the process of replacing the load switch on the column provides a reliable live replacement construction isolation operation device;

(2) Aiming at the key technologies of uninterrupted connection and disconnection of voltage transformers, the supporting combination device of on-column vacuum circuit breakers that meets the requirements of uninterrupted connection, solves the technology of uninterrupted connection and disconnection of voltage transformers in parallel with vacuum circuit breakers problem;

(3) During live operation, the isolation knife switch of the isolation combination device of the present utility model can effectively isolate the connection between the high-voltage live line and the fault voltage transformer, and the arrester function provides the operation overvoltage and voltage limiting protection when the knife switch is opened and closed. , to ensure the stability of the line voltage, and to cut off the power frequency freewheeling current generated by the overvoltage in time to protect the vacuum circuit breaker and voltage transformer on the line;

(4) When the line is working normally, the isolation combination device of the present invention protects the vacuum circuit breaker from lightning overvoltage, and at the same time, the isolation combination device can automatically break away from the fault, and has obvious visible fractures. When overhauling the power outage operation, a grounding device that can be checked for electricity is provided to facilitate the overhaul of the line;

(5) In view of the situation where the branches are lush enough to reach the combined device and there is a metal exposed point in this part, provide insulation against external breakage to ensure the safe and stable operation of the line, and has a positive protective effect on the safety under the pole.

The voltage transformer isolation combination device of the present invention applied to the non-power-off operation is aimed at the power transmission system, and no products with similar ideas of the present invention have been found for the line operation in the above-mentioned situations of maintenance (or live maintenance). , is the necessary operation equipment to solve the urgent need for risk elimination and maintenance in the above-mentioned situations.

To sum up, the voltage transformer isolation combined device of the utility model applied to non-power-off operation is stable and reliable, does not affect the installation structure of the original line equipment, has the characteristics of simple and convenient construction, safety and reliability, high efficiency, and satisfies the voltage mutual inductance. The need for uninterrupted replacement of secondary equipment such as switches.

Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present invention, but not to limit the present invention. Changes and modifications of the embodiments will fall within the scope of the claims of the present invention.

Claims (5)

1. The utility model provides a be applied to voltage transformer isolation composite set of operation not having a power failure, a serial communication port, test pole, overhead line down the terminal, vacuum circuit breaker go up terminal, pillar arrester, composite set erection column, insulating pillar, isolation switch, voltage transformer go up terminal and full insulation protection suit including overhead line row of working, ground connection, overhead line, wherein:

the overhead line wiring bar is formed by sequentially connecting a vertical part, a first inclined part and a second inclined part;

the lower wire connecting end of the overhead wire, one end of the grounding electricity testing rod and one end of the pillar lightning arrester are sequentially connected with the vertical part of the overhead wire connecting row from top to bottom;

the upper wiring terminal of the vacuum circuit breaker is arranged on the first inclined part of the overhead line wiring bar;

the post lightning arrester is transversely arranged and is provided with a fault separation indicator;

the combined device mounting column is arranged at the other end of the pillar lightning arrester, and the end of the pillar lightning arrester is respectively connected with the upper end of the insulating pillar and the fault disconnection indicator;

the upper wiring terminal of the voltage transformer is arranged at the lower end of the insulating support;

one end of the isolation disconnecting link is connected with the lower end of the insulating support, and the other end of the isolation disconnecting link is connected with the second inclined part of the overhead line wiring bar;

the all-insulation protection suit comprises an overhead line wiring bar insulation protection cover, a disconnecting link insulation protection cover, a mutual inductor wiring insulation protection cover and a disconnector insulation protection cover, wherein the overhead line wiring bar insulation protection cover is wrapped outside the overhead line wiring bar; the disconnecting link insulating protective cover is wrapped outside the isolating disconnecting link; the transformer wiring insulation protective cover is wrapped outside the upper wiring end of the voltage transformer; the disconnector insulation shield is wrapped around the outside of the fault disconnection indicator.

2. The voltage transformer isolation combination device applied to the uninterruptible operation as claimed in claim 1, wherein a connecting sheet is provided at the other end of the post arrester, and the connecting sheet is vertically provided; the upper end of the insulating support is connected with the lower end of the connecting sheet, and the fault separation indicator is connected with the upper end of the connecting sheet.

3. The voltage transformer isolation assembly device applied to uninterrupted power operation as claimed in claim 1, wherein the lower end of the insulating support is connected with the upper terminal of the voltage transformer through a wiring board; the transformer wiring insulation protective cover wraps the upper wiring end of the voltage transformer and the wiring board in the transformer wiring insulation protective cover.

4. The isolation assembly of claim 1, wherein the insulation shield of the overhead line busbar encases the overhead line busbar, the lower terminal of the overhead line and the upper terminal of the vacuum circuit breaker.

5. The isolation combination device of the voltage transformer applied to the uninterruptible operation as claimed in claim 1, wherein the grounding test bar and the post lightning arrester are separately arranged at two sides of the vertical part of the overhead line terminal block.

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