SF6 breaker dynamic contact resistance detection device

Abstract

The invention provides an SF6 breaker dynamic contact resistance detection device. The SF6 breaker dynamic contact resistance detection device comprises a super capacitance power source which is connected in parallel with two ends of a port of an SF6 breaker and is used for providing a stable similar current for the SF6 breaker, a current acquisition device which is connected in series with a connection line of the SF6 breaker and the super capacitance power source and is used for acquiring loop currents of the SF6 breaker in a closing and opening process, a voltage acquisition device which is connected in parallel at two ends of the port of the SF6 breaker and is used for acquiring loop voltages of the SF6 breaker in the closing and opening process, and a data processing system which is respectively connected with the current acquisition device and the voltage acquisition device and is used for receiving and displaying the currents and the voltages of the loop and calculating dynamic contact resistance of the SF6 breaker in the closing and opening process according to the currents and the voltages. The detection device is advantaged in that the structure is simple and safe, operation is convenient, and measurement precision is higher when dynamic contact resistance of the SF6 breaker is detected.

Description

technical field [0001] The invention relates to a detection device, in particular to a dynamic contact resistance detection device of an SF6 circuit breaker. Background technique [0002] The circuit breaker contact system is the key component of the SF6 circuit breaker, which consists of main contacts and arc contacts. When the circuit breaker is closed, the arcing contacts are first closed and then the main contacts are closed, and the contact system determines the electric field distribution in the arc extinguishing chamber during the closing process; , the contact system affects the initial pressure of the cylinder during the breaking process; the arc contact is mainly responsible for closing and breaking the current, and the state of the contact system directly affects the performance and service life of the circuit breaker. [0003] In order to determine the state of the circuit breaker contact system, it is generally necessary to detect the loop resistance of the cir...

AI Technical Summary

Problems solved by technology

However, this technical solution is easily affected by many factors such as the size and shape of the arcing contact, the speed of the circuit breaker, the size of the test current, the accuracy of the measuring instrument, and the energy storage power supply during the measurement process. The measurement accuracy is not high and there are many clutter.

[0008] On the other hand: the use of a 12V battery as a discharge power source has the following disadvantages, which will measure the test results and the convenience of the test operation: 1) The battery is used as a power source to measure the dynamic contact resistance of the circuit breaker. The current in the circuit is difficult to be cut off and needs to be Test the circuit breaker for opening and closing operations, or connect protective contactors in series in the circuit

If the measurement is not done properly, it will often cause the battery to burn

2) Large-capacity batteries are bulky and heavy, and are not easy to carry and move, so they are not suitable as a power supply for on-site portable measuring instruments

3) The current in the measurement circuit is not easy to adjust. Usually, the current can only be adjusted by adjusting the resistance of the measurement wire, which is inconvenient to use

4) The dynamic contact resistance measurement results vary in a large range, and the results obtained by existing measurement methods have low resolution in a small range

[0009] In summary, although the measurement of dynamic contact resistance can reflect the state of the arcing contact, the measurement process is affected by many factors such as the size of the test current, the accuracy of the measuring instrument, and the energy storage power supply.

The existing technology has the disadvantages that the test current is not easy to control, improper operation is easy to burn the measurement power supply, and the accuracy of the measurement results is not enough. It is necessary to find a new measurement method to improve the measurement accuracy and facilitate use.

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