阅读说明：本技术 一种核电厂中压接触器合闸微动开关的监测电路 (Monitoring circuit of closing microswitch of medium-voltage contactor in nuclear power plant ) 是由 叶二锋 吴滈 杨立影 沈伟 刘家壁 黄旭 彭转敏 于 2020-04-07 设计创作，主要内容包括：一种核电厂中压接触器合闸微动开关的监测电路,其特征在于：包括接触器合闸电源模块、综合监测继电器、分合闸辅助开关、合闸回路微动开关、位置监测微动开关,其中接触器合闸电源模块、位置监测微动开关的上端均接控制电正电端,而位置监测微动开关的下一端与综合监测继电器连接组成串联电路,接触器合闸电源模块、综合监测继电器的下端均连接合闸回路微动开关的上端,合闸回路微动开关的下端接接控制电负电端,而分合闸辅助开关的两端分别连接合闸回路微动开关的两端组成并联电路。(The utility model provides a monitoring circuit of micro-gap switch that closes a floodgate of voltage contactor in nuclear power plant which characterized in that: the device comprises a contactor closing power supply module, a comprehensive monitoring relay, an opening and closing auxiliary switch, a closing loop micro-switch and a position monitoring micro-switch, wherein the upper end of the contactor closing power supply module and the position monitoring micro-switch is connected with a control electric positive end, the lower end of the position monitoring micro-switch is connected with the comprehensive monitoring relay to form a series circuit, the lower end of the contactor closing power supply module and the comprehensive monitoring relay is connected with the upper end of the closing loop micro-switch, the lower end of the closing loop micro-switch is connected with a control electric negative end, and the two ends of the opening and closing auxiliary switch are respectively connected with the two ends of the closing loop micro-switch to form a parallel circuit.)

1. The utility model provides a monitoring circuit of micro-gap switch that closes a floodgate of voltage contactor in nuclear power plant which characterized in that: including contactor combined floodgate power module (1), comprehensive monitoring relay (2), divide-shut brake auxiliary switch (3), combined floodgate return circuit micro-gap switch (4), position monitoring micro-gap switch (5), wherein contactor combined floodgate power module (1), the upper end of position monitoring micro-gap switch (5) all connects the positive electric end of control electricity, and the lower extreme of position monitoring micro-gap switch (5) is connected with comprehensive monitoring relay (2) and is constituteed series circuit, contactor combined floodgate power module (1), the upper end of combined floodgate return circuit micro-gap switch (4) is all connected to the lower extreme of comprehensive monitoring relay (2), the lower extreme of combined floodgate return circuit micro-gap switch (4) connects the negative electric end of control electricity.

2. The monitoring circuit of the closing microswitch of the medium voltage contactor in the nuclear power plant as claimed in claim 1, characterized in that: the positive end of the control circuit is + 55V.

3. The monitoring circuit of the closing microswitch of the medium voltage contactor in the nuclear power plant as claimed in claim 1, characterized in that: the negative end of the control electrode is-55V.

4. The monitoring circuit of the closing microswitch of the medium voltage contactor in the nuclear power plant as claimed in claim 1, characterized in that: two ends of the opening and closing auxiliary switch (3) are respectively connected with two ends of the closing loop microswitch (4) to form a parallel circuit.

5. The monitoring circuit of the closing microswitch of the medium voltage contactor in the nuclear power plant as claimed in claim 1, characterized in that: the positive end of the control electrode is + 50V.

6. The monitoring circuit of the closing microswitch of the medium voltage contactor in the nuclear power plant as claimed in claim 1, characterized in that: the negative electricity end of the control electricity is-50V.

7. The monitoring circuit of the closing microswitch of the medium voltage contactor in the nuclear power plant as claimed in claim 1, characterized in that: the positive end of the control electrode is + 45V.

8. The monitoring circuit of the closing microswitch of the medium voltage contactor in the nuclear power plant as claimed in claim 1, characterized in that: the negative end of the control electrode is-40V.

9. The monitoring circuit of the closing microswitch of the medium voltage contactor in the nuclear power plant as claimed in claim 1, characterized in that: the positive end of the control electrode is + 60V.

10. The monitoring circuit of the closing microswitch of the medium voltage contactor in the nuclear power plant as claimed in claim 1, characterized in that: the positive end of the control circuit is-60V.

Technical Field

The technology belongs to the field of monitoring of an electric switch control loop, and particularly relates to a design scheme for monitoring the state of a microswitch of a switch closing loop of a safety-related load medium-voltage contactor of a nuclear power plant.

Background

In the design of the general medium-voltage emergency power distribution system contactor switch of the nuclear power plant, a closing loop monitoring function is not designed, a group of micro switches are generally designed on a switch cabinet body and a contactor handcart, a group of micro switches located in the cabinet body is used for monitoring the closing connection state of the handcart when the handcart is in a working position, a group of micro switches located in the contactor handcart is used for closing the closing loop when the handcart is in the working position, but the two groups of micro switches have the condition that the micro switches are closed but the micro switches of the closing loop are not closed because of the difference of the structure and the installation. Found by domestic nuclear power operation, the following problems exist:

the handcart of the switch cabinet contactor is shaken into a working position and is not completely operated, and the phenomenon that the handcart cannot be found is not completely operated, the position monitoring microswitch acts to lead an operator to think that the handcart is operated in place, but the microswitch of a closing loop is not closed, the closing loop is not conducted, so that the handcart cannot be closed when receiving a closing signal, and safety related facilities cannot be reliably started;

faults of a microswitch of a closing circuit of the contactor cannot be timely found and processed, so that the contactor cannot be closed when receiving a closing signal, and safety related facilities cannot be reliably started;

in order to solve the problem, Fujian Fuqing nuclear power company Limited designs a set of closing loop monitoring scheme by analyzing and demonstrating and combining a medium-voltage contactor used on site, and the on-site implementation verifies that the using effect is good and the popularization value is good.

Before the monitoring scheme is implemented, the Fujian Fuqing nuclear power company Limited indirectly judges the closing condition of a microswitch of a closing circuit by measuring the voltage to earth of the closing circuit, and the inspection mode causes manual measurement to be carried out when a contactor is operated to a working position to be in a standby state every time, so that manpower waste is formed, and the grounding fault of a nuclear island direct current system of a nuclear power plant can be formed due to the fact that the closing circuit is grounded due to measurement errors or tool defects.

Disclosure of Invention

The invention aims to: a visual monitoring circuit for the hot standby state of a switch is designed, and the problem that the hot standby switch cannot be reliably switched on due to the fact that a microswitch of a switch closing loop does not act is avoided.

The technical scheme of the invention is as follows: the utility model provides a monitoring circuit of micro-gap switch that closes a floodgate of voltage contactor in nuclear power plant which characterized in that: the device comprises a contactor closing power supply module, a comprehensive monitoring relay, an opening and closing auxiliary switch, a closing loop micro-switch and a position monitoring micro-switch, wherein the upper end of the contactor closing power supply module and the position monitoring micro-switch is connected with a control electric positive end, the lower end of the position monitoring micro-switch is connected with the comprehensive monitoring relay to form a series circuit, the lower end of the contactor closing power supply module and the comprehensive monitoring relay is connected with the upper end of the closing loop micro-switch, the lower end of the closing loop micro-switch is connected with a control electric negative end, and the two ends of the opening and closing auxiliary switch are respectively connected with the two ends of the closing loop micro-switch to form a parallel circuit.

The positive end of the control circuit is + 55V.

The negative end of the control electrode is-55V.

Two ends of the opening and closing auxiliary switch are respectively connected with two ends of the closing loop microswitch to form a parallel circuit.

The positive end of the control electrode is + 50V.

The negative electricity end of the control electricity is-50V.

The positive end of the control electrode is + 45V.

The negative end of the control electrode is-40V.

The positive end of the control electrode is + 60V.

The positive end of the control circuit is-60V.

The invention has the following remarkable effects: the monitoring of the switch state of the closing loop of the safety-related medium-voltage contactor of the nuclear power plant is realized, the problem that the hot standby switch cannot be reliably closed due to the fact that the operation is not in place or the fault of the microswitch is unknown is solved, and the verification effect is good.

Drawings

Fig. 1 is a circuit schematic diagram of a medium voltage contactor closing and comprehensive monitoring loop without closing loop monitoring;

FIG. 2 is a schematic diagram of a circuit of a medium voltage contactor switching-on and comprehensive monitoring loop for increasing monitoring of a switching-on microswitch in the invention;

in the figure: contactor closing power supply module 1, comprehensive monitoring relay 2, opening and closing auxiliary switch 3, closing loop microswitch 4 and position monitoring microswitch 5

Detailed Description

The utility model provides a monitoring circuit of voltage contactor combined floodgate micro-gap switch in nuclear power plant, including contactor combined floodgate power module 1, comprehensive monitoring relay 2, divide closing auxiliary switch 3, combined floodgate return circuit micro-gap switch 4, position monitoring micro-gap switch 5, as shown in figure 2, wherein contactor combined floodgate power module 1, the upper end of position monitoring micro-gap switch 5 all connects the positive electric end of control electricity, and the lower end of position monitoring micro-gap switch 5 is connected with comprehensive monitoring relay 2 and is constituteed the series circuit, contactor combined floodgate power module 1, the upper end of combined floodgate return circuit micro-gap switch 4 is all connected to the lower extreme of comprehensive monitoring relay 2, the lower end of combined floodgate return circuit micro-gap switch 4 connects the negative electric end of control electricity, and the both ends of dividing and shutting auxiliary switch 3 are connected the both ends of.

A method for monitoring a circuit of a closing microswitch of a medium-voltage contactor in a nuclear power plant comprises the following steps:

s1: the medium-voltage contactor is swung to a working position from a switch cabinet isolation position, and a closing loop microswitch and a position monitoring microswitch are switched on and off;

s2: the medium-voltage contactor controls the power supply of a loop and comprehensively monitors the normal power supply of the relay.

If the microswitch of the switching-on loop is not switched on because the medium-voltage contactor shakes to a working position and the operation is not in place, or the microswitch of the switching-on loop is not switched on due to faults, the comprehensive monitoring relay cannot be electrified, and a monitoring alarm signal is sent out.