Method and system for detecting mechanical characteristics of circuit breaker by utilizing SF6 gas pressure
A technology of mechanical characteristics and gas pressure, which is applied in the testing of mechanical components, instruments, measuring devices, etc., can solve problems such as a large amount of manpower and material resources, and conditions that do not meet the conditions for transformation, and achieve the effect of wide applicability
Active Publication Date: 2020-09-01
STATE GRID SHANDONG ELECTRIC POWER +1
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Problems solved by technology
These methods require the modification of equipment and the addition of sensitive sensors, which require a lot of manpower and material resources, and some equipment does not even meet the conditions for modification.
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Embodiment 1
[0029] During the opening process of the circuit breaker, since the line current cannot change suddenly, plasma will be generated between the contacts to form an arc. This arc has a strong thermal effect and releases a large amount of heat, resulting in an increase in the temperature of the SF6 gas. At the same time, according to the gas state equation, the change of SF6 gas temperature can be equivalent to the change of gas pressure, which can effectively utilize the pressure sensors widely installed on SF6 circuit breakers. When the circuit breaker starts to open, an arc is formed, and the heat released causes the pressure of SF6 gas to rise; as the arc continues to burn, the pressure of SF6 gas continues to rise until the arc is completely extinguished, and the pressure of SF6 gas reaches the maximum value; then with the heat Transferring to the outside, the pressure of SF6 gas gradually decreases, and tends to the pressure when it is in a normal state.
[0030] The larger ...
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The invention provides a method and system for detecting mechanical characteristics of a circuit breaker by using SF6 gas pressure, and the method comprises the steps of carrying out the real-time measurement and recording of an SF6 gas pressure value of the circuit breaker, and obtaining the SF6 gas pressure value at each time point; obtaining an SF6 gas pressure intensity-time curve according tothe SF6 gas pressure intensity value at each time point; extracting curve characteristic values; calculating mechanical characteristics of the circuit breaker; correcting the mechanical characteristics of the circuit breaker; and providing breaker maintenance decision. The system for detecting the mechanical characteristics of the circuit breaker comprises an acquisition module, and the acquisition module mainly comprises an SF6 gas pressure intensity sensor and can record an SF6 gas pressure intensity value in real time to obtain an SF6 gas pressure intensity-time curve; the SF6 gas pressureintensity can be fully utilized to detect the mechanical characteristics of the circuit breaker, a sensor does not need to be additionally arranged, convenience and high efficiency are achieved, themechanical characteristic calculation value can be corrected according to the maximum change amount of the SF6 pressure intensity, and wide applicability is achieved.
Description
technical field [0001] The patent of the invention belongs to the field of detection and monitoring of electric equipment, in particular to the field of detection of mechanical characteristics of SF6 circuit breakers. Background technique [0002] High-voltage circuit breaker is an important part of the power system. Its main functions include control and protection. It is used to connect the circuit and disconnect the load during normal operation. In the event of an accident, it can cut off the fault current within a certain period of time. Reclosing is performed when necessary, and its mechanical characteristics directly affect the safe and reliable operation of the power system. SF6 circuit breaker is a circuit breaker with SF6 gas as arc extinguishing and insulating medium. It has the advantages of strong breaking capacity, good breaking performance, long electrical life, good thermal stability, simple structure and maintenance, etc. It is widely used in 35kV and above ...
Claims
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IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 陈伟坤刘鹏雷敏吴寿山孙昭昌白志轩葛惠阳张倩
Owner STATE GRID SHANDONG ELECTRIC POWER