阅读说明：本技术 一种有功剩余电流漏电开关 (Active residual current leakage switch ) 是由 徐秉绶 于 2020-06-04 设计创作，主要内容包括：一种有功剩余电流漏电开关,由剩余电流、电压相位、有功剩余电流检测器、阀值控制器、脱口执行器和断路器组成；有功剩余电流检测器将剩余电流和电压相位进行运算,将剩余电流中的有功剩余电流检测出来输入阀值控制器,经阀值比较后由脱口执行器带动断路器切断电源起到漏电保护功能。(An active residual current leakage switch comprises a residual current, a voltage phase, an active residual current detector, a valve controller, a shedding actuator and a circuit breaker; the active residual current detector calculates the residual current and the voltage phase, detects the active residual current in the residual current, inputs the active residual current into the valve controller, and drives the breaker to cut off the power supply by the shedding actuator after the threshold value comparison so as to realize the electric leakage protection function.)

1. An active residual current leakage switch comprises a residual current, a voltage phase, an active residual current detector, a valve controller, a shedding actuator and a circuit breaker; the method is characterized in that: the active residual current detector calculates the residual current and the voltage phase, detects the active residual current in the residual current, inputs the active residual current into the valve controller, and drives the breaker to cut off the power supply by the shedding actuator after the threshold value comparison so as to realize the electric leakage protection function.

Technical Field

The invention relates to the field of residual current leakage switches, in particular to an active residual current leakage switch.

Background

In the commonly used residual current leakage switch series products in the market, residual currents sensed by the zero sequence transformers are all apparent power residual currents which comprise active residual currents and reactive residual currents, and the reactive residual currents in the power circuit are all small enough to be ignored under the general condition, so that the apparent power residual currents are used for judging the leakage degree of the power circuit in the commonly used residual current leakage switch; however, when the ground-to-ground distributed capacitance in the power circuit is large, the residual current will contain large reactive residual current, for example, in an electric floor heating system, the ground-to-ground distributed capacitance of the heating circuit is very large, and the generated capacitive reactive residual current can reach as much as hundreds of milliamperes, so that the common residual current leakage switch cannot work normally.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an active residual current leakage switch, which only takes the active component in the residual current as the basis of open circuit and disconnection and eliminates the interference of the reactive component.

The invention relates to an active residual current leakage switch which comprises a residual current, a voltage phase, an active residual current detector, a valve value controller, an opening-off actuator and a circuit breaker, wherein the active residual current leakage switch comprises a first switch, a second switch and a third switch; the active residual current detector calculates the residual current and the voltage phase, detects the active residual current in the residual current, inputs the active residual current into the valve controller, and drives the breaker to cut off the power supply by the shedding actuator after the threshold value comparison so as to realize the electric leakage protection function.

The invention only uses the active component in the residual current as the basis of breaking and opening, eliminates the interference of the reactive current to the leakage control, ensures that the residual current leakage switch can be accurately used in a power supply loop with large ground distributed capacitance, and has obvious technical and economic effects.

Drawings

Fig. 1 is a block diagram of an active residual current leakage switch.

Detailed Description

The invention relates to an active residual current leakage switch which comprises a residual current 1, a voltage phase 2, an active residual current detector 3, a valve value controller 4, a shedding actuator 5 and a circuit breaker 6; the active residual current detector 3 calculates the residual current 1 and the voltage phase 2, detects the active residual current in the residual current 1, inputs the active residual current into the valve controller 4, and drives the breaker 6 to cut off the power supply by the shedding actuator 5 after the threshold value comparison so as to achieve the electric leakage protection function.

The invention adopts only the active component in the residual current as the basis of breaking and opening, so that the residual current leakage switch can be accurately used in a power supply loop with large ground distributed capacitance, plays a role in protecting the safety of people and has obvious technical and economic effects.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention shall be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such changes and modifications that fall within the scope and bounds of the appended claims, or equivalents of such scope and bounds.