AC-DC system fault detector and operation method thereof

Abstract

The invention discloses an AC-DC system fault detector and an operation method thereof, and belongs to the field of power monitoring equipment. The detector comprises a detector shell, a device powermodule, a signal extraction module and a processor chip module are arranged in the detector shell, the device power module is used for supplying power to the detector by a voltage stabilization circuit, the signal extraction module is used for detecting a voltage signal, the processor chip module is used for processing voltage signal data by a data processing loop, the signal extraction module comprises a data filtering loop and a data amplification loop, a core component of the data filtering loop is a lowpass filter, a core component of the data amplification loop is an operational amplifier, a core of the data processing loop is a MCU, and the detection of the detector is on the basis of a DC blocking capacitor detection technology. By the detector, the fault removal time of an AC-DC system is reduced, the running safety of a substation during fault removal is improved, the detector is convenient to carry and operate, the real-time state of the DC system is observed by the detector,and the detector is simple and clear and is high in practicability and wide in application range.

Description

【Technical field】 [0001] The invention relates to the field of electric power monitoring equipment, in particular to a fault detector for AC intrusion into a DC system and an operating method thereof. 【Background technique】 [0002] The reliable operation of the DC system plays a very important role in the safety and stability of the system. The rectification device mainly converts the AC power into the DC power required by the relay protection and automatic control device, and forms a mutual backup DC system with the battery to operate normally. The DC system and the AC system are not connected to each other, but due to the wear and tear of the AC and DC cables during long-term operation, damage to the components of the AC and DC devices, or careless human operation, the AC will flow into the DC system. When the AC is connected to the DC circuit in series, the DC circuit will be grounded. Due to the existence of the coupling capacitance between the DC cables and the distrib...

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Problems solved by technology

[0002] The reliable operation of the DC system plays a very important role in the safety and stability of the system. The rectification device mainly converts the AC power into the DC power required by the relay protection and automatic control device, and forms a mutual backup DC system with the battery to operate normally. The DC system and the AC system are not connected to each other, but due to the wear and tear of the AC and DC cables during long-term operation, damage to the components of the AC and DC devices, or careless human operation, the AC will flow into the DC system. When the AC is connected to the DC circuit in series, the DC circuit will be grounded. Due to the existence of the coupling capacitance between the DC cables and the distributed capacitance to the ground, the AC volume will cause the relay to vibrate, cause the protection device to malfunction, and the circuit breaker to trip. Many current substation configurations Fault detection devices for AC intrusion into DC systems have been developed, but these fault detection devices for AC intrusion into DC systems have the problems of long troubleshooting process, irregular operation, and high potential safety hazards

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