A ground fault current compensation system and method for a self-produced power supply phase power supply
A technology of ground fault and current compensation, which is applied in the field of distribution network, can solve problems such as the difficulty of complete compensation for metallic grounding and complicated current control, and achieve the effects of improving power supply security, simple control mode, and ensuring power supply reliability
Active Publication Date: 2022-06-07
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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[0009] In view of this, the object of the present invention is to provide a ground fault current compensation system and method for self-produced power supply phase power supply, through the compensation transformer to change the line power supply on the bus into a reverse phase power supply, combined with the combined switch connected to the system The neutral point is connected to the fault phase to suppress the overvoltage of the fault phase to achieve the purpose of full compensation, which effectively solves the problems of complex current control and difficulty in complete compensation of metallic grounding in the single-phase ground fault of the power distribution system. There is a coupling voltage-regulating transformer to adjust the voltage of the line power supply after changing the phase of the power supply, so as to achieve the purpose of full compensation of current and voltage in the case of a ground fault. After the invention is fully compensated, no arc occurs, avoiding the risk of personal electric shock and improving the reliability of power supply and power security
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[0049] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, those skilled in the art will All other embodiments obtained without creative work fall within the scope of protection of the present application.
[0050] like Figure 1-Figure 6 As shown, a ground fault current compensation system and method for self-produced power supply phase power supply of the present invention:
[0051] In this embodiment, Figure 5 The voltage conversion process of the typical embodiment in the first connection mode is given. The connection group of the compensation transformer (1) is Dy11, and the voltage ratio is k. The voltage ratio of the coupled regulator transformer is The connection method between the combination switch (2) and...
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The invention discloses a ground fault current compensation system and method for a self-produced power supply phase power supply, comprising a compensation transformer, a combination switch, a coupling voltage regulating transformer and a controller, the input end of the compensation transformer is connected to a bus bar, and the compensation transformer The output end of the combination switch is connected to the input end of the combination switch, the output end of the combination switch is connected to the neutral point, and the coupling voltage regulating transformer is connected in series between the combination switch and the neutral point. The system can passively generate distribution network power supply phase power supply and harmonic phase power supply, and put the reverse phase power supply phase power supply and harmonic phase power supply into the system according to the fault logic. Realize the complete compensation of ground fault reactive current, harmonic current and active current in the distribution network, and overcome the disadvantages of incomplete compensation by using the inverter injection method of power electronic devices after taking power from the bus system. The invention can fully compensate the overvoltage and overcurrent generated by the grounding fault, and completely eliminates the risk of personal electric shock.
Description
technical field [0001] The invention relates to the technical field of distribution network, in particular to a ground fault current compensation system and method for self-produced power supply phase power supply. Background technique [0002] Single-phase grounding faults in distribution networks at home and abroad account for more than 80%, which seriously affects the safe operation of power grids and equipment. Safely handling grounding faults plays an important role in social and economic development. When the capacitance current of the system is greater than 10A, the grounding method of the arc suppression coil is adopted. The arc suppression coil can reduce the fault current to a certain extent, and the system can run for 2 hours with a fault, but the arc suppression coil cannot achieve full compensation, and there is still a residual current of less than 10A at the fault point, which can cause personal electric shock and fire accidents. , and a serious threat to the...
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IPC IPC(8): H02H9/08H02J3/12
CPCH02H9/08H02J3/12
Inventor 刘红文王科赵现平张恭源黄星陈宇民柴晨超
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST