On-line detection method of insulation performance of three-phase it system
A technology of insulation performance and IT system, applied in the direction of testing dielectric strength, etc., can solve problems such as difficulty in fault line selection and location of fault characteristic quantity, complex system, etc.
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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[0031] The present invention will be further described below in conjunction with accompanying drawing.
[0032] Such as figure 1 Shown is a block diagram of an embodiment of an on-line detection device for insulation performance. figure 1 The embodiment includes a controller unit 100 , an insulation signal sampling unit 200 , a 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 AC IT system, respectively. The three-phase AC IT system is a three-wire system without a neutral line; PE is the protective conductor or protective ground of the IT system .
[0033] 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 resistor R E1 , the second ...
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The invention relates to an online detection method for the insulation performance of a three-phase IT system, which is implemented by a device comprising a controller unit, an insulation signal sampling unit and a voltage sampling unit. The voltage sampling unit and the insulation signal sampling unit are respectively used for acquiring monitoring narrow-pulse voltage signals and grounding narrow-pulse voltage signals and sending the monitoring narrow-pulse voltage signals and the grounding narrow-pulse voltage signals to the controller unit. The insulation signal sampling unit is composed of a first signal sampling branch circuit comprising a first electronic switch, a second signal sampling branch circuit comprising a second electronic switch, a third signal sampling branch circuit comprising a third electronic switch and a sampling resistor. The controller unit controls the first electronic switch, the second electronic switch and the third electronic switch to be turned on to acquire the grounding narrow-pulse voltage signals. The online detection method can realize online monitoring for the insulation performance of a three-phase three-wire-system AC IT system without a need of injecting additional independent signals; grounding insulation resistance values of three buses can be calculated accurately, and the online detection method can further judge the insulation aging degree of the buses in addition to monitoring a short-circuit fault.
Description
technical field [0001] The invention relates to a circuit system insulation monitoring method, in particular to an on-line detection method for the insulation performance of a three-phase IT system. 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 colle...
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IPC IPC(8): G01R31/12
CPCG01R31/12
Inventor 凌云肖伸平王兵文定都
Owner BAIHE POWER SUPPLY BUREAU OF GUANGXI POWER GRID CO LTD