Three-phase AC IT system insulation performance on-line testing device
An IT system, three-phase AC technology, applied in the direction of testing circuits, testing dielectric strength, etc., can solve problems such as system complexity, fault feature quantity, fault line selection and positioning difficulties, and achieve the effect of eliminating the impact
Active Publication Date: 2019-03-01
邳州市铁富九龙公共服务有限公司
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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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Embodiment Construction
[0038] The present invention will be further described below in conjunction with accompanying drawing.
[0039] Such as figure 1 Shown is a block diagram of an embodiment of an on-line detection device for the insulation performance of a three-phase AC IT system. 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 .
[0040] 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 lim...
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Disclosed is a three-phase AC IT system insulating performance online detection apparatus. The three-phase AC IT system insulating performance online detection apparatus comprises a controller unit, an insulation signal sampling unit and a voltage sampling unit, wherein the voltage sampling unit and the insulation signal sampling unit are respectively used for obtaining monitoring narrow pulse voltage signals and grounding narrow pulse voltage signals and sending the signals to the controller unit; the insulation signal sampling unit comprises a first signal sampling branch including a first electronic switch, a second signal sampling branch including a second electronic switch, a third signal sampling branch including a third electronic switch, and a sampling resistor; and the controller unit controls the first electronic switch, the second electronic switch and the third electronic switch to be switched on so as to obtain the grounding narrow pulse voltage signals. The apparatus can realize online monitoring of insulation performance of a three-phase three-wire-system AC IT system without injection of additional independent signals, can accurately calculate respective grounding insulation resistance values of three phase wires, and can also determine the insulation deterioration degrees of the phase wires apart from monitoring short-circuit faults.
Description
technical field [0001] The invention relates to a circuit system insulation monitoring device, in particular to an on-line detection device for the insulation performance of a three-phase AC 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 co...
Claims
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IPC IPC(8): G01R31/12G01R31/14
CPCG01R31/12G01R31/14
Inventor 凌云孔玲爽张晓虎
Owner 邳州市铁富九龙公共服务有限公司