Three-phase four-wire IT system power quality monitoring and insulation fault line selection and location method
A technology of power quality monitoring and IT system, applied in fault location, fault detection according to conductor type, measurement of electrical variables, etc., can solve the problems of fault feature quantity, fault line selection and positioning, and system complexity.
Active Publication Date: 2019-03-01
南京电科自动化有限公司
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Problems solved by technology
When the injection signal method is used to monitor the insulation of the IT system, regardless of whether the injection is a DC signal, a single-frequency AC signal, or a dual-frequency AC signal, a corresponding independent signal source is required, and the system is complex; and the effective value of the voltage of the independent signal source is not allowed to exceed 50V, which brings difficulties to the judgment of fault characteristic quantity and fault line selection and location
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[0029] The present invention will be further described below in conjunction with accompanying drawing.
[0030] Such as figure 1 Shown is a block diagram of an embodiment of an insulation on-line monitoring and insulation fault line selection and location device. figure 1 The embodiment includes a controller unit 100 , an insulation signal sampling unit 200 , a current and voltage sampling unit 300 , a verification unit 400 , an alarm unit 500 , and a human-computer interaction unit 600 . A, B, and C are phase line A, phase line B, and phase line C of the three-phase four-wire IT system, respectively; N is the neutral line of the three-phase four-wire IT system; PE is the protective conductor or ground of the IT system.
[0031] Such as figure 2 Shown is the circuit schematic diagram of the embodiment of the isolation signal sampling unit, including the first electronic switch M1, the second electronic switch M2, the third electronic switch M3, the first current limiting re...
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The invention discloses an electric energy quality monitoring and insulation fault line selection positioning method for a three-phase four-line IT system, and the method is implemented through a device which comprises a controller unit, an insulation signal sampling unit, and a current and voltage sampling unit. The current and voltage sampling unit and the insulation signal sampling unit are respectively used for obtaining three-phase voltage and current signals and a grounding narrow impulse voltage signal and transmitting the signals to the controller unit for the electric energy quality monitoring and insulation fault line selection positioning. The grounding narrow impulse voltage signal is obtained in a manner that the controller unit controls a first electronic switch, a second electronic switch and a third electronic switch in a first signal sampling branch circuit, a second signal sampling branch circuit and a third signal sampling branch circuit in the insulation signal sampling unit to be switched on. The method can judge and locate the grounding short-circuit faults of phase lines and a neutral line in the three-phase four-line IT system with no need of an additional independent signal, or judge and locate the poor grounding insulation faults of the phase lines and the neutral line, and calculates the grounding insulation resistance during a single-phase fault.
Description
technical field [0001] The invention relates to a power grid performance monitoring method, in particular to a three-phase four-wire IT system power quality monitoring and insulation fault line selection and positioning method. Background technique [0002] When power supply for loads such as mines, field medical vehicles, ships, etc., high reliability and safety are required for power supply, so it is a good choice to use IT system power supply. When the IT system fails for the first time, the fault current is small, and the metal casing of the electrical equipment will not generate dangerous contact voltage. Therefore, the electrical equipment can continue to operate without cutting off the power supply, but the power quality and insulation performance must be monitored online and monitored. Notify through the alarm device, check and eliminate the fault in time. [0003] In the current IT system insulation on-line monitoring, the detection method based on the injection si...
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IPC IPC(8): G01R31/00G01R31/08G01R31/12
CPCG01R31/00G01R31/086G01R31/12
Inventor 凌云曾红兵杨兴果肖伸平
Owner 南京电科自动化有限公司