BS0307B type isolation switch touch finger pressure tester

BS0307B type isolation switch touch finger pressure tester

BS0307B type isolation switch touch finger pressure tester

Product Introduction

Isolation switch is the most widely used high-voltage switchgear in the power system. As outdoor isolation switch is the only electrical equipment that works completely exposed to the atmosphere and is most directly and severely affected by environmental climate conditions, its operating conditions are relatively poor, which can easily cause mechanical or electrical failures. Especially, the contact part of the contact finger is easily invaded by rainwater, dust, and harmful gases, resulting in poor contact and heat generation. The spring that provides contact finger pressure will be annealed due to heat generation, causing the pressure to decrease. This further leads to a vicious cycle of contact finger heating and ultimately burns out the contact finger, causing accidents. During maintenance, attention is often only paid to replacing springs that have obvious failures or fractures, while those springs with reduced pressure cannot be judged and replaced. Therefore, in the next operation, The sentence is:, The distribution of current in each contact finger will vary depending on the pressure, and the greater the difference, the more uneven the current distribution. After long-term operation, poor contact and overheating will occur, and the heating of the contact finger will be in a vicious cycle. If one contact finger has poor contact, it will spread throughout the entire contact. At the same time, there are many adjustable contact finger pressures for isolation switches. If the adjustment pressure is not enough during maintenance or if there are differences in the adjustment pressure of each contact finger, the above phenomenon will also occur.

At present, the vast majority of maintenance personnel judge the contact quality of conductive parts by measuring their circuit resistance. They believe that if the circuit resistance is within the qualified range, the maintenance work of conductive parts can be successfully completed. In fact, the circuit resistance value given in the product manual is the value of the entire conductive circuit, including the body resistance and contact resistance of the wiring terminals, conductive tubes, contact fingers and other parts. The range is large and the margin is large, and it cannot directly reflect the change of contact resistance, but can only indicate the conductive circuit path; The experiment shows that the circuit resistance values of two pairs of contact fingers and four pairs of contact fingers are both within the qualified range, and the circuit resistance values of high and low contact finger pressure are basically unchanged.

In various maintenance procedures and standards, there are provisions for measuring the contact pressure of the touch finger. The recommended measuring tool is a spring scale. In practical work, measuring the contact pressure of the touch finger needs to be done at high altitude. Using a spring scale to measure pressure is not only inconvenient, inaccurate, but also unsafe. Some structures of isolation switches cannot be measured by a spring scale at all (such as scissor type), so the requirement to measure the contact pressure of the touch finger is just a piece of paper.

In response to the current maintenance status of the power supply system, our company has independently developed a testing instrument for measuring the contact pressure of high-voltage isolation switches. It only needs to open the sensor of the test clamp simulating the contact at each pair of contact positions to display and remember the contact pressure of the contact fingers at this time, effectively solving a major problem in measuring the contact pressure of the contact fingers. This instrument is used for detecting the contact pressure of various isolation switches. The instrument is controlled by a microcomputer and uses high-precision pressure sensors from Germany. It is easy to operate, accurate in measurement, strong in anti-interference ability, and easy to carry. It is suitable for measuring the contact pressure of isolation switches in various occasions. This product fills the gap in measuring the pressure of isolation switches in China and can also be used for inspecting the contact pressure of isolation switch manufacturers. The, Changing the shape of the pressure sensor can also measure the finger pressure of the circuit breaker.

Product Features

1. WA1401 can measure the contact pressure of domestic 10KV-500KV and imported GW4, GW5, GW6, GW7, GW10, GW16, GW17, GW22, GW23 series isolating switches by adjusting the sensor opening distance size.

2. WA1402 is specifically designed for the folding arm type (GW6, GW16, GW17, GW22, GW23, etc.) series of isolation switches. The sensor is designed with the same shape and size as the static contact (long conductive tube shape), and the clamping force of the moving contact can be measured by simply clamping the sensor with the moving contact during measurement.

Technical parameters (special parameters can be customized)

Working environment: temperature -20~40 ℃, relative humidity ≤ 80% RH.

Atmospheric pressure: 86-106 kPa

Power supply voltage: AC220V ± 10% 50Hz ± 10% or internal lithium battery power ≤ 20W

Measurement range: ≤ 1000N, error ≤ 1%

Measuring diameter (finger opening distance): 5.5mm to 90mm, greater than 90mm (customizable)

Built in lithium battery, power supply working time: ≥ 6 hours (customizable)

Charging method:

1. Dedicated charger connected to panel lithium battery charging interface for charging

2. Panel AC220V plug charging

Sensor signal line length: 10m

Insulation resistance:>2M Ω

Dielectric strength: The power supply can withstand the 1.5KV power frequency voltage of the casing for 1 minute without flashover or arcing.

Note: Due to continuous product updates, the appearance of the product is subject to the actual product. Technical parameters and models are subject to change without prior notice, and our company reserves the right of interpretation; If there is any act of theft or copying, legal responsibility will be pursued.