Device and method for detecting resistance of bus bar to ground in DC system with silicon chain
A bus-to-ground, DC system technology, applied in the direction of grounding resistance measurement, etc., can solve the problems of large deviation, false alarm, and large deviation of the insulation resistance detection value
Active Publication Date: 2019-02-15
INTEGRATED ELECTRONICS SYST LAB
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Problems solved by technology
However, in a DC system containing a silicon chain, due to the influence of the voltage at both ends of the silicon chain, when an insulation fault occurs on the closing bus or the control bus, the resistance values of the positive and negative buses to ground calculated by the balanced bridge method and the unbalanced bridge method will be There is a large deviation, and the greater the voltage drop of the silicon chain, the greater the deviation
[0005] In summary, when the existing balanced bridge method and unbalanced bridge method are applied to a DC system with a silicon chain, due to the influence of the voltage drop of the silicon chain, there is a problem of large deviations in the detection value of the insulation resistance of the positive and negative busbars to the ground, and even cause errors. Serious consequences such as reporting and omission
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[0029] A detection device for the ground resistance of the bus bar of the DC system with a silicon chain, such as Figure 9 As shown, it includes CPU, positive and negative bus-to-ground voltage measurement circuit, balanced bridge and unbalanced bridge switching circuit, branch circuit leakage current sensor signal detection circuit, A / D conversion circuit, RS485 communication circuit, multi-way conversion switch circuit, dialing code Switch address setting circuit, LED display circuit, watchdog circuit, such as figure 1 The positive and negative bus bar-to-ground voltage measurement circuit shown is: the closing bus bar HM and the control bus bar KM on both sides of the silicon chain are respectively connected to the second switch K2 and the third switch K3 which are electrically interlocked. One end of a detection resistor R1 and the other end of the first detection resistor R1 are grounded through the first grounding switch K1; the negative bus FM is grounded through the f...
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The invention relates to a ground insulation resistance detection device and method for positive and negative buses of an ungrounded DC system with a silicon chain. A double balance bridge is used to detect the ground voltages of the positive and negative buses, namely a closing bus and a control bus, and the signal value of a branch leakage current sensor, data of the branch leakage current sensor is analyzed to determine the insulation grounding condition, and a corresponding calculation formula is used. Voltage drop of the silicon chain is taken into consideration, the problem that grounding insulation resistance calculation error of buses of the DC system with the silicon chain is too large in the prior art is solved, the detection precision for the grounding insulation resistance of the buses of a DC system without the silicon chain can be reached, and severe results as false alarm and missing alarm caused by too large calculation error can be avoided.
Description
technical field [0001] The invention belongs to the field of insulation monitoring of an ungrounded DC system, and in particular relates to a device and method for detecting the insulation resistance of positive and negative busbars to ground in an ungrounded DC system with a silicon chain. Background technique [0002] The DC power supply of power plants and substations is the operating power supply and control signal power supply of the main electrical equipment. It is a very large multi-branch power supply network, and its common fault is a point ground fault. Under normal circumstances, grounding at one point does not immediately affect the operation of the DC system, but if the grounding fault point cannot be quickly found and repaired, when another point is grounded, it may cause malfunction of signal loops, control loops, relay protection devices, etc. Or refuse to move, resulting in serious consequences. Therefore, there must be an insulation resistance detection de...
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IPC IPC(8): G01R27/20
CPCG01R27/20
Inventor 李鹏夏业启孙兴伟田宝进崔怀磊王宝莹石涛
Owner INTEGRATED ELECTRONICS SYST LAB