System and method for monitoring stroke of circuit breaker contact
A monitoring system and contact travel technology, applied in instruments, measuring devices, electrical devices, etc., can solve the problems of being susceptible to electromagnetic interference, low monitoring rate, inconvenient installation, etc., to improve monitoring resolution and sampling rate, sampling High rate and low cost effect
Pending Publication Date: 2019-07-26
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology
[0007] Aiming at the problems of high cost, inconvenient installation, low monitoring rate and susceptibility to electromagnetic interference in the existing circuit breaker contact travel monitoring system, the present invention provides a circuit breaker contact travel monitoring system, including:
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Embodiment 2
[0086] In this embodiment, each device of a specific model is used for illustration, specifically including:
[0087] The metal target is made of aluminum alloy material. image 3 The shape shown is installed on the main shaft of the circuit breaker; the outer diameter of the metal target is 4cm, the inner diameter is 2cm, and the thickness is 0.6mm.
[0088] The PCB coil is composed of a printed circuit board and a spiral wire on the circuit board and a chip ceramic capacitor; the PCB coil is not in contact with the metal target.
[0089] The model of the inductance-to-digital converter is LDC1101; the model of the microcontroller is STM32F207; the host computer is an ordinary desktop or notebook computer.
[0090] The inductance-to-digital converter and the microcontroller are installed in the low-voltage room of the switch cabinet; the inductance-to-digital converter is connected to the PCB coil through a shielded cable.
[0091] This embodiment monitors the contact strok...
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The invention provides a system and a method for monitoring the stroke of a circuit breaker contact. The system comprises a metal target, a PCB coil, a measuring chip and a controller; the metal target is arranged on a main shaft of the circuit breaker to be monitored or below the insulating pull rod; the PCB coil and the plane of the metal target are arranged in parallel, and the PCB coil and themetal target are not in contact with each other; the measuring chip is connected with the PCB coil and used for monitoring a resonance signal of the PCB coil and obtaining an inductance value based on the resonance signal when the relative position of the metal target and the PCB coil moves due to the action of the circuit breaker main shaft or the insulating pull rod; the controller is connectedwith the measuring chip and used for receiving the inductance value sent by the measuring chip and determining the stroke of the circuit breaker contact. The system and the method for monitoring thestroke of the circuit breaker contact solves the problems of sensor installation and electromagnetic interference in the circuit breaker contact stroke monitoring system through a non-contact measurement technology.
Description
technical field [0001] The invention relates to a power monitoring system, in particular to a monitoring system and a monitoring method for a contact stroke of a circuit breaker. Background technique [0002] As a very important high-voltage switchgear, the circuit breaker is not only responsible for the normal connection and disconnection of the circuit in the power system, but also plays a role in safety protection for the circuit and electrical appliances. , The key to safe operation. The stroke-time characteristic of the moving contact when the circuit breaker opens and closes is the basis for calculating the opening and closing speed, and it is also an important parameter to characterize its mechanical characteristics and breaking circuit capability. Improving the safety and reliability of power systems is critical, but the contacts of circuit breakers are located in a fully enclosed vacuum bubble, which cannot be directly monitored. [0003] At present, the sensors u...
Claims
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Login to View More IPC IPC(8): G01B7/02
CPCG01B7/02
Inventor 李玉凌李二霞杨红磊张波何连杰孙智涛许保平樊勇华常方圆亢超群李立生孙勇
Owner CHINA ELECTRIC POWER RES INST