Three-phase four-wire IT system power quality and insulation performance monitoring device
An IT system, three-phase four-wire technology, applied in measuring devices, measuring electrical variables, measuring electricity, etc., can solve the problems of fault feature quantity, fault line selection and positioning, and complex system.
Inactive Publication Date: 2019-03-01
BAIHE POWER SUPPLY BUREAU OF GUANGXI POWER GRID CO LTD
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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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Embodiment Construction
[0033] The present invention will be further described below in conjunction with accompanying drawing.
[0034] like figure 1 Shown is a block diagram of the embodiment of the power quality and insulation performance monitoring 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.
[0035] like 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 resistor R E1 , the second curre...
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Provided is an electric energy quality and insulating performance monitoring device of a three-phase four-wire IT system. The monitoring device comprises a controller unit, an insulation signal sampling unit and a current and voltage sampling unit; and the current and voltage sampling unit and the insulation signal sampling unit obtain three-phase voltage and current signals and narrow pulse voltage signals to ground respectively and send the signals to the controller unit for insulation performance and electric energy quality monitoring. The controller unit switches on first, second and third electronic switches in first, second and third signal sampling branches in the insulation signal sampling unit to obtain the narrow pulse voltage signals to ground. The device can monitor the insulation performance of the three-phase four-wire IT system online needless of addition of extra independent signals, determine short-circuit faults to ground of positioning phase lines and neutral lines or determine and locate a grounding insulation failure fault of the phase lines, and calculate the grounding insulating resistance during the insulation fault of the single phase line.
Description
technical field [0001] The invention relates to a power grid performance monitoring device, in particular to a three-phase four-wire IT system power quality and insulation performance monitoring device. 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 signal is widely used. By c...
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IPC IPC(8): G01R31/12G01R31/00G01R31/02
CPCG01R31/00G01R31/12G01R31/50
Inventor 凌云郑伟华刘建华周维龙
Owner BAIHE POWER SUPPLY BUREAU OF GUANGXI POWER GRID CO LTD