CN105698667A - Reasonable-scheme-based measuring device for engagement depth of circuit breaker contacts - Google Patents

Abstract

Disclosed in the invention is a reasonable-scheme-based measuring device for the engagement depth of circuit breaker contacts. The measuring device comprises six sets of displacement sensors that are installed in counter sinks inside six moving contacts of an A phase, a B phase, and a C phase of a handcart type circuit breaker of a high-voltage switch cabinet. A power line and a signal line are led out from a surrounding gap of a plum-blossom contact and are led out of the high-voltage switch cabinet by the space of the handcart type circuit breaker and then are connected with a data processing device; and the data processing device is connected with a display device. The provided measuring device has advantages of reasonable structure and convenient and accurate measurement.

Description

Reasonable Measuring Device for Contact Engagement Depth of Circuit Breaker

This application is a divisional application with application number 201410341258.8, application date 2014.7.18, and name "measuring device for contact engagement depth of handcart-type circuit breaker in closed armored high-voltage switchgear".

technical field

The invention relates to a device for measuring engagement 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 object of the present invention is to provide a device for measuring engagement depth of contacts of a handcart type circuit breaker in a closed armored high-voltage switchgear cabinet with reasonable structure, convenient and accurate measurement.

Technical solution of the present invention is:

A closed and armored high-voltage switchgear handcart-type circuit breaker contact engagement depth measurement device is characterized in that it includes six sets of displacement sensors, and the six sets of displacement sensors are respectively installed in A, B, and B of the high-voltage switchgear handcart-type circuit breaker. C three-phase 6 moving contacts internal counterbore, the power line and signal line are led out from the space around the moving contact, and lead to the high-voltage switchgear through the space of the handcart circuit breaker, and are connected with the data processing device. The data processing device is connected to the man-machine interface display module; the displacement sensor is a contact type or guided rebound type displacement sensor, the sensor range is 10mm~100mm, the sensor accuracy is 0.1%~1%, and the sensor power supply is DC 5V, 10V, 12V or 24V voltage level, the output of the displacement sensor can be selected as a voltage of 0~5V or 0~10V; or the output of the displacement sensor can be selected as a current signal of 0~10mA, 0~20mA or 4~20mA;

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 travel is called the meshing depth of the dynamic and static contacts. The displacement travel is detected and output by the sensor, read and processed by the data processing device, and finally the displacement travel data can be directly displayed in the man-machine interface display module of the measuring device; The personnel determine 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; The staff removes the handcart, increases or decreases the number of static contact installation gaskets as needed, and then repeats the above work until the requirements are met.

The invention provides an intelligent measuring device for the engagement depth of the handcart-type circuit breaker contacts of metal-enclosed armored high-voltage switchgear, which will solve the problem of "complicated process, difficult measurement, and error-prone" in field installation, debugging, measurement, and acceptance It is of great significance to ensure the accuracy of measurement and the reliable contact of moving and static contacts.

The scheme of the present invention is reasonable. When in use, the displacement sensor module is installed in the inner counterbore hole of the moving contact (plum blossom contact) of the high-voltage switch cabinet handcart circuit breaker, so as to ensure that the displacement sensor ejector rod (needle) can be connected with the moving contact. Synchronous contact with the static contact, the power line and the signal line are drawn out through the gap of the plum blossom contact, and lead out to the high-voltage switchgear through the space of the handcart 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 counting starts when the ejector rod (needle) of the displacement sensor pushes against the static contact, until the handcart moves to the working position, it will generate A displacement stroke, which is called the engagement (insertion) depth of the moving and static contacts, and the displacement stroke can be displayed on the man-machine interface of the measuring device. It can realize the accurate measurement of the engagement of the dynamic and static contacts of the handcart circuit breaker, which is convenient and reliable, and solves the problems of traditional measurement methods such as difficult measurement, large dimensional data errors, and low reliability. It is of great significance to accurately measure the meshing depth of the contact of the type circuit breaker 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 structural schematic diagram of an embodiment of the present invention.

detailed description

A closed armored high-voltage switchgear handcart-type circuit breaker contact engagement depth measurement device, including six sets of displacement sensors 1, six sets of displacement sensors are respectively installed in the A, B, C three-phase of the high-voltage switchgear handcart-type circuit breaker In the counterbore holes inside the six moving contacts 6, the power lines and signal lines are led out through the gaps in the circle of the moving contacts (plum blossom contacts), and lead out to the high-voltage switchgear through the space of the handcart circuit breaker, and the data processing device 2 are connected, and the data processing device is connected to a display device (such as a human-machine interface) 3. There is also a power supply unit 8 among the figures.

The data processing device adopts the existing mature data processing equipment (such as data acquisition card, etc.), and the display device can choose digital quantity display instrument, PDA or directly display in the computer.

The displacement sensor should be a contact type or guided rebound displacement sensor, such as a differential transformer displacement sensor, the sensor range should be 10mm~100mm, the sensor accuracy should be 0.1%~1%, and the sensor power supply should be DC 5V, 10V, 12V or 24V The voltage level of commonly used measuring devices, the output of the displacement sensor is selected as a common voltage (0~5V or 0~10V) or a common current signal (0~10mA, 0~20mA or 4~20mA).

Including six sets of displacement sensors, the six sets of displacement sensors are respectively installed in the counterbore holes of the six moving contacts of the A, B, and C three-phase three-phase of the high-voltage switchgear. Lead out from the gap in the circle, and lead out to the high-voltage switchgear through the space of the handcart circuit breaker, and connect with the data processing device, which is connected to the man-machine interface display module; the displacement sensor can choose contact type or guided rebound type displacement sensor, sensor Range selection is 10mm~100mm, sensor accuracy selection is 0.1%~1%, sensor power supply selection is DC 5V, 10V, 12V or 24V voltage level, displacement sensor output selection is voltage 0~5V or 0~10V; or displacement sensor The output selection of the current signal is 0~10mA, 0~20mA or 4~20mA;

When the handcart-type circuit breaker 4 is pushed into the switch cabinet 5, the counting starts when the moving contact 6 enters the static contact 7, that is, the counting starts when the ejector pin of the displacement sensor pushes against the static contact, until the handcart moves to the working position, it will A displacement stroke is generated, which 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 device, and finally can be directly displayed in the man-machine interface display module of the measuring device. Data; the staff judges whether the meshing depth of the dynamic and static contacts of the high-voltage switchgear handcart circuit breaker is met. If the requirements are met, the handcart can be removed, the measuring device can be removed, and the working position of the handcart can be reset; Requirements, 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.

Claims (1)

1. the rational contact of breaker depth of engagement measurement apparatus of scheme, it is characterized in that: include six set displacement transducers, six set displacement transducers are loaded in the internal counter sink of 6 moving contacts of A, B, C three-phase of high-voltage switch cubicle handcart formula chopper respectively, power line and holding wire are drawn in the space, border of moving contact, and draw high-tension switch cabinet through the space of handcart type breaker, being connected with data processing equipment, data processing equipment is connected to man machine interface display module；Displacement transducer selects contact or guiding back springing type displacement transducer, transducer range is chosen as 10mm ~ 100mm, sensor accuracy is chosen as 0.1% ~ 1%, and sensor power power supply selects direct current 5V, 10V, 12V or 24V electric pressure, and the output of displacement transducer is chosen as voltage 0 ~ 5V or 0 ~ 10V；Or the output of displacement transducer is chosen as current signal 0 ~ 10mA, 0 ~ 20mA or 4 ~ 20mA；Display device adopts PDA；

When after handcart type breaker push-on switch cabinet, moving contact starts counting up when entering static contact, namely the push rod top of displacement transducer to static contact time start counting up, until handcart moves to operating position, one section of displacement stroke can be produced, this LAP is the depth of engagement of dynamic/static contact, and this displacement stroke reads through sensor detection and output, data processing equipment and processes, and may finally directly display displacement stroke data in the man machine interface display module of this measurement apparatus；Determining whether the dynamic/static contact depth of engagement requirement reaching high-voltage switch cubicle handcart formula chopper through staff, if reaching requirement, handcart can be removed, remove this measurement apparatus, reset handcart operating position；If not reaching requirement, then requiring that staff removes handcart, increasing or reducing static contact as required and the quantity of pad is installed, then repeating above-mentioned work, till meeting requirement。