Grounding reliability monitoring method and system of tt system based on injected signal
A technology of injecting signals and reliability, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of high cost, poor grounding of grounding resistance, increased grounding resistance, etc., to reduce manufacturing costs, use costs, and accuracy. High and stable effect
Active Publication Date: 2019-09-10
CHONGQING UNIV
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Problems solved by technology
[0004] In the prior art, the detection of the grounding performance of the TT system is to directly detect whether the grounding wire is disconnected, but it cannot detect the change of the grounding resistance, so that the current grounding performance cannot be accurately judged. For example, if the grounding resistance increases, at this time It just means that the grounding resistance is poorly grounded, and there is no disconnection; in addition, the means of the existing technology are generally expensive, such as direct measurement by a resistance measuring instrument, and the current grounding status information cannot be fed back in time
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[0079] Example: Based on the above two constraints, when RAmax=100Ω, with a step size of 5°, Table 1 can be obtained:
[0080]
[0081] Table 1
[0082] It can be seen from Table 1 that when the conduction angle of the thyristor is 10°, the effective value of the disturbance current signal is less than the operating current of the RCD device, and when the disturbance current signal is loaded on the equipment shell, the charged voltage of the shell is less than the safe The voltage is 33V, and when the above two conditions are met, and the conduction angle is 10°, I p min and I p max The value of is the largest.
[0083] When δ is selected as 10°, take 10 ohms as the step size to value the resistance RO, and Table 2 can be obtained:
[0084]
[0085]
[0086] Table 2
[0087] It can be obtained from Table 2 that when the conduction angle of the thyristor is 10° and the resistance R0 is 60Ω, the effective value of the disturbance current signal is less than the oper...
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The invention proposes an injection-signal-based TT system's grounding reliability monitoring method, comprising: S1) injecting a disturbance current signal to the grounding loop circuit of the TT system; and S2) detecting the disturbance signal and comparing the signal with a determining threshold; and based on the comparison result, determining the grounding performance of the TT system. According to the invention, it is possible to realize accurate monitoring to the changing conditions of the grounding resistors of a TT system without compromising the normal working of the loop circuit in order to dynamically respond to the grounding change information of the TT system. In addition, the monitoring accuracy is high and practical in real time. Beyond that, the manufacturing cost and the using cost can be reduced effectively.
Description
technical field [0001] The invention relates to a power monitoring method, in particular to a grounding reliability monitoring method of a TT system based on injected signals and a system thereof. Background technique [0002] The TT system is a grounding system in which the neutral point of the transformer on the power side of the low-voltage power distribution system is directly connected to the earth, while the exposed conductive part on the equipment side is directly connected to the earth nearby, and there is no metallic connection between the power ground and the equipment ground. The electrical devices in the TT system have their own grounding electrodes and are not connected to each other. When a fault voltage occurs on the PE line of a certain device, the fault voltage will not spread through the PE line to the exposed conductive parts of each device. It is suitable for outdoor distribution Electrical equipment, outdoor lighting, agricultural electricity and other o...
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IPC IPC(8): G01R31/00
Inventor 雍静王晓静陆家明曾礼强华国栋
Owner CHONGQING UNIV