Combined type grounding system of reactor and resistor in power distribution network
A technology for grounding systems and power distribution networks, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, protection against overcurrents, electrical components, etc. Ungrounded, unable to ensure the safe operation of the power system, etc., to achieve the effect of improving the reliability of power supply and eliminating the grounding fault of the power grid
Inactive Publication Date: 2012-08-01
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology
At present, in order to solve the problems caused by the ungrounded neutral point, two methods are generally used: the arc suppression coil grounding method or the small resistance grounding method. Among them, the arc suppression coil grounding method can realize arc extinguishing, but it is difficult to find the grounding line. shortcoming
The small resistance grounding method has the disadvantages of no distinction between instantaneous grounding and permanent grounding faults, and a high tripping rate.
Therefore, the existing neutral point grounding system cannot effectively eliminate the grid grounding fault and cannot guarantee the safe operation of the power system
Method used
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Embodiment Construction
[0016] The present invention will be further described below in conjunction with accompanying drawing.
[0017] see figure 1 , the combined grounding system of reactance and resistance in the distribution network of the present invention includes a reactor 1 resistance 2, a controller 3 and a grounding transformer 4 connected to the busbar, wherein:
[0018] The grounding transformer 4 is connected to the neutral point 5 of the distribution network;
[0019] One end of the reactor 1 is connected to the neutral point 5 and the phase terminal of the grounding transformer 4, and the other end is grounded;
[0020] One end of the resistor 2 is connected to the neutral point 5 through a switch 6, and the other end is grounded;
[0021] The input terminal of the controller 3 is connected to the neutral point 5 through the voltage transformer 7 and the current transformer 8 respectively, one output terminal is grounded, and the other output terminal is connected to the switch 6 . ...
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The invention discloses a combined type grounding system of a reactor and a resistor in a power distribution network. The combined type grounding system comprises the reactor, the resistor, a controller and a grounding transformer for connecting a bus, wherein the grounding transformer is connected with a neutral point of a power distribution network; one end of the reactor is connected with the end of the neutral point, which is connected with the grounding transformer, the other end of the reactor is grounded; one end of the resistor is connected with the neutral point through a switch, the other end of the resistor is grounded; and input ends of the controller are respectively connected with the neutral point through a voltage transformer and a current transformer, one output end is grounded and the other output end is connected with the switch. According to the invention, the grounding failure of a power grid can be effectively eliminated, and safety operation of a power system is ensured.
Description
technical field [0001] The invention relates to a combined grounding system of reactance and resistance in a distribution network. Background technique [0002] At present, the neutral point grounding methods of the low-voltage distribution network in the power system mainly include the following types: 1. The neutral point is not grounded; 2. The neutral point is grounded through a resistor; 3. The resonance grounding method. [0003] In the neutral point ungrounded system, when a phase fault occurs, the weak point of the non-faulty phase voltage rises and the insulation may be broken down, causing a phase-to-ground short circuit and damaging electrical equipment. At present, in order to solve the problems caused by the ungrounded neutral point, two methods are generally used: the arc suppression coil grounding method or the small resistance grounding method. Among them, the arc suppression coil grounding method can realize arc extinguishing, but it is difficult to find the...
Claims
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IPC IPC(8): H02H9/00H02H7/26H02H3/08
Inventor 姚建歆顾临峰徐剑曹扬邵峥达沙征周鑫顾晓鸣章日华沈道义
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO