CN105180879A - Circuit breaker contact engagement depth measurement method enabling convenient and accurate measurement - Google Patents

Abstract

The invention discloses a convenient and accurate method for measuring the meshing depth of contacts of a circuit breaker. When the handcart-type circuit breaker is pushed into the switch cabinet, the counting starts when the moving contact enters the static contact, that is, the ejector rod of the displacement sensor reaches the Counting starts when the handcart moves to the working position, and a displacement stroke will be generated. The displacement stroke is detected and output by the sensor, read and processed by the data processing module, and finally the displacement stroke data is directly displayed in the man-machine interface display module. ; After the staff judges whether the engagement depth requirements of the dynamic and static contacts of the handcart circuit breaker of the high-voltage switchgear are met, if the requirements are met, the handcart can be removed, the measuring device is dismantled, and the working position of the handcart is reset; if the requirements are not met , the staff is required to remove the handcart, increase or decrease the number of static contact installation gaskets as needed, and then repeat the above work until the requirements are met. The invention has convenient and accurate measurement.

Description

A Convenient and Accurate Method for Measuring Engagement Depth of Circuit Breaker Contacts

This application is a divisional application with application number 201410341260.5, application date 2014.7.18, and name "Method for Measuring Engagement Depth of Handcart Circuit Breaker Contacts in Closed Armored High Voltage Switchgear".

technical field

The invention relates to a method for measuring the engaging depth of contacts of a handcart type circuit breaker in a closed armored high-voltage switch cabinet.

Background technique

High-voltage switchgear refers to the role of on-off, control or protection in power system power generation, transmission, distribution, power conversion and consumption. High-voltage switchgear is used as electrical products with a voltage level of 3.6kV~550kV, and high-voltage isolating switches And grounding switch, high-voltage load switch, high-voltage automatic recloser and sectionalizer, high-voltage operating mechanism, high-voltage explosion-proof power distribution device and high-voltage switchgear and other major categories.

The high-voltage switchgear has functions such as overhead incoming and outgoing lines, cable incoming and outgoing lines, and bus connection. It is mainly applicable to various fields such as power plants, substations, petrochemicals, metallurgical steel rolling, light industry and textiles, factories and mines, residential quarters, and high-rise buildings.

The high-voltage switchgear should meet the relevant requirements of the "AC metal-enclosed switchgear" standard. It consists of two parts: the cabinet and the circuit breaker. line etc.

According to the installation method of the circuit breaker, the high-voltage switchgear is divided into removable type (handcart type) and fixed type; according to the installation location, it is divided into indoor and outdoor; according to the structure of the cabinet, it can be divided into metal-enclosed armored switchgear, metal-enclosed compartment There are four types of switchgear, metal-enclosed box-type switchgear and open-type switchgear.

Indoor, metal-enclosed armored high-voltage switchgear with handcart circuit breakers is usually called armored removable AC metal-enclosed switchgear (hereinafter referred to as switchgear), and its common voltage levels include 10kV, 20kV, 35kV etc. Mainly used in power plants, substations, power transmission of small and medium generators, power distribution of industrial and mining enterprises and institutions, and starting of large high-voltage motors. It is used to receive and distribute electrical energy, and to control, protect and monitor circuits.

The switchgear is composed of two parts: a fixed cabinet and a removable part (handcart). The removable part (handcart) consists of the chassis and the circuit breaker body, and the propulsion mechanism is installed inside the chassis. Two wheels are installed on each side of the chassis, and needle bearings are installed inside, which makes the handcart light and flexible when pushing and pulling out. Handcarts are divided into circuit breaker handcarts, isolation handcarts, voltage transformer handcarts, grounding handcarts, etc. According to the function of the electrical equipment in the cabinet, the cabinet body is divided into four different functional units with partitions, including: circuit breaker room, busbar room, cable room and instrument room. The shell of the cabinet and the partitions between the functional units are made of bent aluminum-zinc plates. The static contact of the circuit breaker is installed on one side of the fixed cabinet in the circuit breaker room, and the paired moving contact (plum blossom contact) of the circuit breaker is installed on the side of the removable part (handcart). In the closed circuit breaker chamber, the engagement depth of the two cannot be visually observed.

In the operation of high-voltage switchgear, the handcart switch is moved from the test position to the working position, and the handcart switch is hand-operated. When the moving contact enters the static contact, it starts counting, and the journey until it reaches the working position is called the meshing of the moving and static contacts (insertion). )depth.

After the switch cabinet is newly installed, the meshing depth of the moving and static contacts of the handcart circuit breaker must be checked. The meshing depth of the moving and static contacts of the 10kV~35kV handcart circuit breaker is 15~30mm, and the measurement size must be accurate to the millimeter level. The traditional measurement method is: apply a small amount of Vaseline on the static contacts, push the handcart to the running position, then pull the handcart out of the cabinet, and then measure the indentation left on the static contacts when the moving and static contacts of the handcart are engaged . Handcart switch, the process of cranking to the working position cannot be seen or touched by hand, so this original measurement method can only be used, and the size data error is very large, especially in summer high temperature season, when the temperature is above 35 ℃ Vaseline liquefies, and the indentation cannot be seen clearly, or even has no indentation, which brings great difficulties to the on-site measurement and acceptance, and cannot guarantee the accurate and reliable contact of the dynamic and static contacts of the handcart circuit breaker (must be in the case of power failure on the bus side and feeder side) ) and are prone to errors.

Contents of the invention

The purpose of the present invention is to provide a convenient and accurate method for measuring the engagement depth of the contacts of the handcart type circuit breaker of the enclosed armored high-voltage switchgear.

Technical solution of the present invention is:

A method for measuring the engagement depth of the handcart-type circuit breaker contacts of a closed armored high-voltage switchgear, which is characterized in that: at the position where the handcart moves out of the switchgear, the metal-enclosed armored high-voltage switchgear handcart-type circuit breaker contacts The 6 sets of displacement sensor modules of the meshing depth intelligent measuring device are installed in the internal counterbore holes of the 6 moving contacts of the three phases A, B, and C of the handcart circuit breaker of the high-voltage switchgear, and the power lines and signal lines pass through the plum blossom contacts. It is drawn out from the space of the circle of the handcart circuit breaker, and leads out to the high-voltage switchgear through the space of the handcart circuit breaker, and is connected with the power module and the data processing module. When the handcart-type circuit breaker is pushed into the switch cabinet, the counting starts when the moving contact enters the static contact, that is, the counting starts when the ejector rod of the displacement sensor pushes against the static contact, until the handcart moves to the working position, a displacement stroke will be generated , this section of stroke is called the meshing depth of the dynamic and static contacts. The displacement stroke is detected and output by the sensor, read and processed by the data processing module, and finally the human-machine interface display module directly displays the displacement stroke data; the staff judges whether it reaches the high-voltage switch. The meshing depth requirements of the dynamic and static contacts of the cabinet handcart circuit breaker, if the requirements are met, the handcart can be removed, the measuring device is removed, and the working position of the handcart is reset; if the requirements are not met, the staff is required to remove the handcart , increase or decrease the number of static contact mounting gaskets as needed, and then repeat the above work until the requirements are met.

The invention has a reasonable scheme, can realize the accurate measurement of the engagement of the dynamic and static contacts of the handcart circuit breaker, is convenient and reliable, solves the problems of traditional measurement methods such as large measurement difficulty, large size data error, and low reliability, and is beneficial to the realization of metal-enclosed armoring It is of great significance to accurately measure the meshing depth of the contacts of the handcart circuit breaker of the high-voltage switchgear and ensure the reliable contact of the moving and static contacts. The final measurement and display accuracy of the measuring device can reach ±0.1mm.

Description of drawings

The present invention will be further described below in conjunction with drawings and embodiments.

Fig. 1 is a flow chart of the measurement method of the present invention.

Fig. 2 is a schematic diagram of the measuring device used in the present invention.

Detailed ways

A method for measuring the engagement depth of the contacts of a handcart-type circuit breaker in a closed armored high-voltage switchgear. At the position where the handcart is removed from the switchgear 1, the engagement depth of the contacts of the handcart-type circuit breaker 2 in a metal-enclosed armored high-voltage switchgear is measured. The 6 sets of displacement sensor modules 7 of the intelligent measuring device are installed in the counterbore holes of the 6 moving contacts 3 of the three phases A, B, and C of the handcart circuit breaker of the high-voltage switchgear, and the power lines and signal lines pass through the moving contacts. (Tube-blossom contact) leads out from the space of the circle, and leads out to the high-voltage switchgear through the space of the handcart circuit breaker, and connects with the power module 4 and the data processing module 5. When the handcart-type circuit breaker is pushed into the switch cabinet, the counting starts when the moving contact enters the static contact, that is, the counting starts when the ejector rod of the displacement sensor pushes against the static contact 6, until the handcart moves to the working position, a certain displacement will occur Stroke, this section of the stroke is called the meshing depth of the dynamic and static contacts. The displacement stroke is detected and output by the sensor, read and processed by the data processing module, and finally the human-machine interface display module 8 directly displays the displacement stroke data; the staff judges whether it reaches The engagement depth requirements of the moving and static contacts of the handcart circuit breaker of the high-voltage switchgear, if the requirements are met, the handcart can be removed, the measuring device is removed, and the working position of the handcart is reset; if the requirements are not met, the staff is required to remove it Handcart, increase or decrease the number of static contact mounting gaskets as needed, and then repeat the above work until the requirements are met.

Claims (1)

1. measure convenience, accurately contact of breaker depth of engagement measuring method for one kind, it is characterized in that: the position of shifting out from switch cubicle at handcart, 6 of metal enclosed armouring high-voltage switch cubicle handcart formula contact of breaker depth of engagement intelligent measuring device cover displacement sensor module are arranged in the inner counter sink of A, B, C three-phase 6 moving contacts of high-voltage switch cubicle handcart formula isolating switch, power lead and signal wire are drawn in the space, border of moving contact, and draw high-tension switch cabinet through the space of handcart type breaker, be connected with power module, data processing module; When after handcart type breaker push-on switch cabinet, moving contact starts counting when entering static contact, namely the push rod top of displacement transducer is to starting counting during static contact, until handcart moves to working position, one section of displacement stroke can be produced, this LAP is the depth of engagement of dynamic/static contact, and this displacement stroke detects through sensor and reads and process with output, data processing module, directly shows displacement stroke data in final man-machine interface display module; Determine whether through staff the dynamic/static contact depth of engagement requirement reaching high-voltage switch cubicle handcart formula isolating switch, if reach requirement, can handcart be removed, remove this measurement mechanism, reset handcart working position; If do not reach requirement, then require that staff removes handcart, increase or reduce the quantity that static contact installs pad as required, then repeat above-mentioned work, till meeting the demands; Measurement and display precision reach ± 0.1mm.