Electric energy quality and insulating performance monitoring device of three-phase four-wire IT system
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.
Active Publication Date: 2017-04-19
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
Method used
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[0033] The present invention will be further described below with reference to the accompanying drawings.
[0034] like figure 1 Shown is a block diagram of an embodiment of a 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 the phase line A, phase line B, and phase line C of the three-phase four-wire IT system, respectively, and N is the neutral line of the three-phase four-wire IT system; PE is the protective conductor or protective ground of the IT system.
[0035] like figure 2 Shown is a circuit schematic diagram of an embodiment of the insulating signal sampling unit, including a first electronic switch M1, a second electronic switch M2, a third electronic switch M3, and a first current limiting resistor R E1 , the...
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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 power quality and insulation performance monitoring device of a three-phase four-wire IT system. Background technique [0002] When supplying power to loads such as mines, field medical vehicles, ships, etc., high reliability and safety of power supply are required. It is a good choice to use IT system for 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 power supply can not be cut off and the electrical equipment can continue to operate. However, it is necessary to monitor the power quality and insulation performance online and check the Through the alarm device notification, timely inspection and elimination of faults. [0003] In the current on-line monitoring of IT system insulation, the detection method based on inj...
Claims
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Login to View More 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