An online measuring device for insulation resistance of surge protector in power supply system
A technology for surge protectors and power supply systems, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc. It can solve the problems of not being suitable for surge protectors, and achieve the effects of simple structure, high precision, and stable and reliable performance.
Inactive Publication Date: 2017-05-03
南京旦茨电子科技有限公司
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Problems solved by technology
The methods for online detection of insulation resistance of high-voltage equipment include: DC component method, low-frequency overlapping method, dielectric loss angle factor measurement method, partial discharge method and grounding current method, but experiments show that these methods are not suitable for online insulation of surge protectors. Resistance detection
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[0021] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0022] Such as figure 1 The structure diagram of the present invention is shown as an on-line measurement device for the insulation resistance of surge protectors in power supply systems, which is used to measure the insulation resistance value of surge protectors in power supply systems, including adjustable DC high voltage sources, reactors, voltage detection unit and first to third reference resistors R1 to R3, the reactor includes first to third inductances, and one end of the first to third inductances R1 to R3 is connected to the three-phase live wires in the power supply system in one-to-one correspondence, The other ends of the first to third inductors and the neutral line in the power supply system are connected to the positive output terminal of the adjustable DC high voltage source through the first reference resistor R1, and the...
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The invention discloses an on-line measurement device for power supply system surge protection device insulation resistance. The on-line measurement device comprises an adjustable direct current high voltage source, an electric reactor, a voltage detection unit, a first reference resistor, a second reference resistor and a third reference resistor. The electric reactor comprises a first inductor, a second inductor and a third inductor. One end of the first inductor, one end of the second inductor and one end of the third inductor are connected with three phases of live wires in a power supply system in a one-to-one corresponding mode. The other end of the first inductor, the other end of the second inductor, the other end of the third inductor and a center wire in the power supply system are connected with the positive output end of the adjustable direct current high voltage source through the first reference resistor. The positive output end of the adjustable direct current high voltage source passes through the second reference resistor and then is grounded. The negative output end of the adjustable direct current high voltage source passes through the third reference resistor and then is grounded. The positive input end of the voltage detection unit is connected with the center wire in the power supply system. The negative input end of the voltage detection unit is grounded. The grounded end of a surge protection device is connected with the negative output end of the adjustable direct current high voltage source after being disconnected with the ground. The on-line measurement device judges the aging and degradation conditions of the surge protection device and analyzes the working conditions of the surge protection device by measuring the surge protection device insulation resistance.
Description
technical field [0001] The invention belongs to the field of lightning science and technology, and in particular relates to an on-line measuring device for the insulation resistance of a power supply system surge protector. Background technique [0002] The surge protector is installed in the power supply line. Under the action of line voltage or overvoltage for a long time, the components in the surge protector will age and the insulation performance will decline. When the insulation performance declines, the surge protector loses the function of releasing the energy of lightning waves and suppressing lightning overvoltage, the insulation resistance becomes smaller, the leakage current becomes larger, and even affects the normal operation of the power transmission system. Therefore, the surge protector in operation The detection of insulation performance is very important. [0003] The insulation resistance test method of the surge protector is tested in the laboratory, an...
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IPC IPC(8): G01R31/00G01R27/02
Inventor 李祥超周中山李鹏飞陈璞阳
Owner 南京旦茨电子科技有限公司