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An automatic control method of capacity-adjusting arc-suppression coil

A technology of arc suppression coil and capacity adjustment, which is applied in the direction of emergency protection circuit devices, electrical components, circuit devices, etc. used to limit overcurrent/overvoltage, and can solve the problem of arc suppression coils, arc suppression coils, Problems such as arc suppressing coil put into resonance gear

Active Publication Date: 2015-09-23
苏州四方智电能源科技有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The traditional automatic control of the arc suppression coil adopts the method of timing tracking, which cannot automatically calculate the gear that the arc suppression coil should be put into during compensation according to the change of the system.
When calculating the capacitance of the power grid to the ground, the traditional two-point method and the displacement voltage method have the problem of inaccurate calculation, and at the same time, the arc suppression coil may be put into the resonance gear, resulting in the neutral point voltage exceeding the limit

Method used

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  • An automatic control method of capacity-adjusting arc-suppression coil
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  • An automatic control method of capacity-adjusting arc-suppression coil

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Embodiment Construction

[0029] The present invention will be further described below by specific embodiment:

[0030] The automatic control method of the capacity-adjusting arc-suppression coil, the steps are as follows:

[0031] Step 1: According to the change of the amplitude and phase of the neutral point voltage of the system, judge whether the operation mode of the system has changed. If the amplitude or phase change of the neutral point voltage reaches 20% of the value before the change, trigger the arc suppression coil controller To detect the capacitance of the power grid to the ground, the detection method is first based on the following figure 1 The equivalent circuit diagram of the neutral point grounded grid system through the arc suppression coil is shown, and the formula (1) is derived as follows:

[0032]

[0033] in , with They are the first phase voltage of the power grid, the second phase voltage of the power grid and the third phase voltage of the power grid; is the neu...

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Abstract

The invention provides a method for automatically controlling a capacity modulating type arc suppression coil. According to the operation characteristics of the capacity modulating type arc suppression coil, a novel three-point method is used for detecting the ground capacitance of a power grid and under the condition that a damping resistor is not additionally arranged, neutral point voltage can not excess the limit in the process of tracking. According to the change condition of the amplitude value of the neutral point voltage in the system and the phase change condition of the neutral point voltage in the system, change of the operation mode of the system is judged, and therefore tracking and detection of the capacity modulating type arc suppression coil are triggered.

Description

technical field [0001] The invention belongs to the field of resonance grounding of electric power systems, and in particular relates to an automatic control method of a capacity-adjusting arc suppression coil. Background technique [0002] In most distribution networks in my country, the neutral point is compensated by the arc-suppression coil. When a single-phase ground fault occurs, the system capacitor current can be compensated to reduce the residual current at the ground point, prevent the expansion of the accident, and greatly improve the reliability of the system. power supply reliability. [0003] The capacity-adjustable arc suppression coil changes the capacitance in parallel with the arc suppression coil inductance by switching the thyristor to change the equivalent inductance of the arc suppression coil, which can be quickly put into the specified gear, and has obvious advantages compared with the turn-adjustable arc suppression coil . The traditional automatic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/08
Inventor 王一刘建政
Owner 苏州四方智电能源科技有限公司
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