CN111987694A - A device and method for perimeter alarm and over-limit power-off in a test area - Google Patents

Abstract

Translated fromChinese

本发明涉及一种试验区域周界报警及越限断电装置及方法，属于变电试验设备技术领域。技术方案是：总空开（1）通过交流接触器一（2）和旋钮开关（4）连接组成启动电路；开关电源（5）、行程开关（6）和蜂鸣器（7）连接组成报警电路；红外光栅对射探测器（8）、中间继电器一（9）、中间继电器二（10）和交流接触器二（3）依次连接组成断电电路；红外光栅对射探测器、中间继电器一和复归按钮依次连接组成断电保持电路；启动电路分别与报警电路、断电电路和断电保持电路连接。本发明在进行高压试验时，打开围栏门会进行报警，且无论进/出试验场地试验电源会自动断电，强行终止试验，直到按下复归按钮方能恢复供电，保证现场人员的安全。

The invention relates to a device and method for alarming and power-off at the perimeter of a test area, belonging to the technical field of substation test equipment. The technical scheme is: the main air switch (1) is connected by the AC contactor (2) and the rotary switch (4) to form a starting circuit; the switching power supply (5), the travel switch (6) and the buzzer (7) are connected to form an alarm Circuit; infrared grating on-beam detector (8), intermediate relay one (9), intermediate relay two (10) and AC contactor two (3) connected in sequence to form a power-off circuit; infrared grating on-beam detector, intermediate relay one It is connected with the reset button in turn to form a power-off holding circuit; the starting circuit is respectively connected with the alarm circuit, the power-off circuit and the power-off holding circuit. In the present invention, when a high-voltage test is performed, an alarm will be issued when the fence door is opened, and the test power supply will be automatically cut off regardless of entering/exiting the test site, and the test will be forcibly terminated.

Description

Translated fromChinese

一种试验区域周界报警及越限断电装置及方法A device and method for alarming and over-limit power-off at the perimeter of a test area

技术领域technical field

本发明涉及一种试验区域周界报警及越限断电装置及方法，属于变电试验设备技术领域。The invention relates to a device and method for alarming and power-off at the perimeter of a test area, belonging to the technical field of substation test equipment.

背景技术Background technique

依据变电安全规范，在进行高压试验的专用场所，应设置常设遮拦或围栏，试验过程中任何人不得进出试验场所。而由于某些人员安全意识薄弱，习惯性违章的现象时有发生。在试验过程中，存在其他人员打开或翻越常设围栏的情况，违规进入试验场地后误碰带电设备导致人身伤亡；或在试验过程中，监护人临时离开现场，操作人独自进行试验项目，极易误操作，严重违反安全规程。According to the substation safety regulations, in the special place for high-voltage test, a permanent screen or fence should be set up, and no one is allowed to enter or leave the test site during the test. However, due to the weak safety awareness of some personnel, habitual violations occur from time to time. During the test, there are situations where other personnel open or climb over the permanent fence, and enter the test site illegally and accidentally touch the live equipment, resulting in personal injury or death; or during the test process, the guardian temporarily leaves the site, and the operator conducts the test project alone, which is very easy to mistake. operation, a serious violation of safety regulations.

发明内容SUMMARY OF THE INVENTION

本发明目的是提供一种试验区域周界报警及越限断电装置及方法，通过在常设围栏及其前端试验区域的边界设置报警和断电装置，在进行高压试验时，打开围栏门会进行报警，且无论进/出试验场地均会触发红外传感器，届时试验电源会自动断电，强行终止试验，直到按下复归按钮方能恢复供电，保证现场人员的安全；若进行高压试验，本系统自动带电运行，无需单独进行启动，进一步提高了试验的安全性；成本低，安全性高，也可用于其他类似生产试验场所，具有普适性，有效地解决了背景技术中存在的上述问题。The purpose of the present invention is to provide a device and method for alarming and power-off at the perimeter of the test area. Alarm, and the infrared sensor will be triggered regardless of entering/exiting the test site. At that time, the test power supply will be automatically cut off and the test will be forcibly terminated. The power supply can be restored until the reset button is pressed to ensure the safety of on-site personnel; if a high-voltage test is performed, the system will The automatic live operation does not need to be started separately, which further improves the safety of the test; the cost is low and the safety is high, and it can also be used in other similar production test sites, which is universal and effectively solves the above problems in the background technology.

本发明的技术方案是：一种试验区域周界报警及越限断电装置，包含总空开、交流接触器一、交流接触器二、旋钮开关、开关电源、行程开关、蜂鸣器、红外光栅对射探测器、中间继电器一、中间继电器二、复归按钮、试验电源和常设围栏，所述总空开通过交流接触器一和旋钮开关连接组成启动电路，并与试验电源连接；开关电源、行程开关和蜂鸣器连接组成报警电路，安装在常设围栏的围栏门连接处；红外光栅对射探测器、中间继电器一、中间继电器二和交流接触器二依次连接组成断电电路，红外光栅对射探测器安装在常设围栏前端试验区域的边界；红外光栅对射探测器、中间继电器一和复归按钮依次连接组成断电保持电路；启动电路分别与报警电路、断电电路和断电保持电路连接，开关电源分别为报警电路、断电电路和断电保持电路供电。The technical scheme of the present invention is: a perimeter alarm and limit power-off device in a test area, comprising a total air circuit breaker, an AC contactor, a second AC contactor, a knob switch, a switching power supply, a travel switch, a buzzer, an infrared Grating beam detector,intermediate relay 1,intermediate relay 2, reset button, test power supply and standing fence. The travel switch and the buzzer are connected to form an alarm circuit, which is installed at the connection of the fence door of the permanent fence; the infrared grating on-beam detector, theintermediate relay 1, theintermediate relay 2 and theAC contactor 2 are connected in turn to form a power-off circuit, and the infrared grating pair The radiation detector is installed at the boundary of the test area at the front end of the permanent fence; the infrared grating on-radiation detector, theintermediate relay 1 and the reset button are connected in turn to form a power-off hold circuit; the starting circuit is respectively connected with the alarm circuit, power-off circuit and power-off hold circuit. , the switching power supply supplies power to the alarm circuit, the power-off circuit and the power-off hold circuit respectively.

所述行程开关型号为D4V-8108SZ-N，蜂鸣器为低功率的小型蜂鸣器。The model of the travel switch is D4V-8108SZ-N, and the buzzer is a small buzzer with low power.

所述红外光栅对射探测器由发射杆及接收杆配对组成。The infrared grating on-beam detector is composed of a pair of transmitting rods and receiving rods.

所述试验电源包含空开及插座，空开及插座的数量为一个以上。The test power supply includes air switches and sockets, and the number of air switches and sockets is more than one.

还设有试验电源箱，总空开、交流接触器一、交流接触器二、开关电源、中间继电器一、中间继电器二和试验电源安装在试验电源箱的内部，旋钮开关和复归按钮安装在试验电源箱的外表面。There is also a test power box. The main air circuit breaker,AC contactor 1,AC contactor 2, switching power supply,intermediate relay 1,intermediate relay 2 and test power supply are installed inside the test power box, and the knob switch and reset button are installed in the test power supply box. The outer surface of the power box.

一种试验区域周界报警及越限断电方法，采用上述装置，包含如下步骤：A method for alarming and power-off at the perimeter of a test area, using the above-mentioned device, comprising the following steps:

①在进行高压试验前的准备工作结束后，关闭常设围栏的围栏门，开始试验；① After the preparatory work before the high-voltage test is completed, close the fence gate of the permanent fence and start the test;

②试验时先合上总空开，报警电路、断电电路以及试验电源同时带电，此时可开始进行试验；② During the test, first close the main air circuit breaker, the alarm circuit, the power-off circuit and the test power supply are charged at the same time, and the test can be started at this time;

③若试验过程中有人试图进入试验区域，打开常设围栏的围栏门会带动行程开关的转臂，行程开关的触点动作导通报警电路，蜂鸣器报警，提醒此人违规进入试验区域；③ If someone tries to enter the test area during the test, opening the fence door of the permanent fence will drive the arm of the travel switch, the contact action of the travel switch will turn on the alarm circuit, and the buzzer will alarm, reminding the person to enter the test area in violation of regulations;

④若此人不理会报警并走进试验区域，会经过红外光栅对射探测器，红外光栅对射探测器的常开触点会先闭合然后分开，闭合时导通断电电路，此时中间继电器一的导磁体（线圈）带电，衔铁被吸向导磁体，同时衔铁压动触点弹片，使其三个常开触点闭合，其中一个触点导通断电保持电路，在红外光栅对射探测器的常开触点分开后可继续为中间继电器一供电；其余两个触点闭合后为中间继电器二供电，中间继电器二导磁体（线圈）带电后，其常闭触点断开，致使交流接触器二断电，试验电源失电，试验被强制中断；④If the person ignores the alarm and walks into the test area, he will pass the infrared grating opposite-beam detector. The normally open contact of the infrared grating opposite-beam detector will be closed first and then separated. When closed, the power-off circuit will be turned on. The magnet guide (coil) ofrelay 1 is charged, the armature is attracted to the magnet guide, and at the same time the armature presses the contact shrapnel to close the three normally open contacts, and one of the contacts conducts the power-off holding circuit. After the normally open contacts of the detector are separated, it can continue to supply power to theintermediate relay 1; after the other two contacts are closed, theintermediate relay 2 is powered. The second AC contactor is powered off, the test power supply is powered off, and the test is forcibly interrupted;

⑤断电保持电路会将此状态一直保持下去，直到按下复归按钮，中间继电器一失电，常开触点复位，继而中间继电器二失电，常闭触点复位，而后交流接触器二导通，恢复对试验电源的供电；⑤ The power-off hold circuit will keep this state until the reset button is pressed, once the intermediate relay is de-energized, the normally open contact is reset, and then the second intermediate relay is de-energized, the normally closed contact is reset, and then the second AC contactor leads Turn on, restore the power supply to the test power supply;

⑥若试验过程中，任何试验人员离开试验区域，也会经过红外光栅对射探测器，继而试验被强制中断，从而避免不良后果的产生。⑥ If any test personnel leave the test area during the test, they will also pass through the infrared grating to reflect the detector, and then the test is forcibly interrupted, thereby avoiding adverse consequences.

本发明的有益效果是：通过在常设围栏及其前端试验区域的边界设置报警和断电装置，在进行高压试验时，打开围栏门会进行报警，且无论进/出试验场地均会触发红外传感器，届时试验电源会自动断电，强行终止试验，直到按下复归按钮方能恢复供电，保证现场人员的安全；若进行高压试验，本系统自动带电运行，无需单独进行启动，进一步提高了试验的安全性；成本低，安全性高，也可用于其他类似生产试验场所，具有普适性。The beneficial effects of the present invention are: by setting the alarm and power-off device at the boundary of the permanent fence and its front-end test area, when the high-voltage test is performed, the fence door will be opened to give an alarm, and the infrared sensor will be triggered regardless of entering/exiting the test site. At that time, the test power supply will be automatically cut off, the test will be forcibly terminated, and the power supply will be restored until the reset button is pressed to ensure the safety of the on-site personnel; if the high-voltage test is performed, the system will automatically run with power on, and there is no need to start it separately, which further improves the test performance. Safety; low cost, high safety, can also be used in other similar production test sites, with universality.

附图说明Description of drawings

图1是本发明的总电路图；Fig. 1 is the general circuit diagram of the present invention;

图2是本发明的启动电路图；Fig. 2 is the starting circuit diagram of the present invention;

图3是本发明的报警电路图；Fig. 3 is the alarm circuit diagram of the present invention;

图4是本发明的断电电路图；Fig. 4 is the power-off circuit diagram of the present invention;

图5是本发明的断电保持电路图；Fig. 5 is the power-off holding circuit diagram of the present invention;

图6是本发明的结构示意图；Fig. 6 is the structural representation of the present invention;

图中：总空开1、交流接触器一2、交流接触器二3、旋钮开关4、开关电源5、行程开关6、蜂鸣器7、红外光栅对射探测器8、中间继电器一9、中间继电器二10、复归按钮11、试验电源12、常设围栏13、试验电源箱14、绝缘垫15。In the figure:total air switch 1,AC contactor 1 2,AC contactor 2 3,rotary switch 4,switching power supply 5,travel switch 6,buzzer 7, infraredgrating beam detector 8,intermediate relay 1 9, Intermediate relay two 10 ,reset button 11 ,test power supply 12 ,standing fence 13 , testpower supply box 14 ,insulating pad 15 .

具体实施方式Detailed ways

下面结合附图与实施例对本发明技术方案作进一步详细的说明。The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

一种试验区域周界报警及越限断电装置，包含总空开1、交流接触器一2、交流接触器二3、旋钮开关4、开关电源5、行程开关6、蜂鸣器7、红外光栅对射探测器8、中间继电器一9、中间继电器二10、复归按钮11、试验电源12和常设围栏13，所述总空开1通过交流接触器一2和旋钮开关4连接组成启动电路，并与试验电源12连接；开关电源5、行程开关6和蜂鸣器7连接组成报警电路，安装在常设围栏13的围栏门连接处；红外光栅对射探测器8、中间继电器一9、中间继电器二10和交流接触器二3依次连接组成断电电路，红外光栅对射探测器8安装在常设围栏13前端试验区域的边界；红外光栅对射探测器8、中间继电器一9和复归按钮11依次连接组成断电保持电路；启动电路分别与报警电路、断电电路和断电保持电路连接，开关电源5分别为报警电路、断电电路和断电保持电路供电。A test area perimeter alarm and limit power-off device, including atotal air switch 1, anAC contactor 2, anAC contactor 2 3, arotary switch 4, aswitching power supply 5, atravel switch 6, abuzzer 7, an infrared Thegrating beam detector 8, theintermediate relay 1 9, theintermediate relay 2 10, thereset button 11, thetest power supply 12 and thepermanent fence 13, thetotal air switch 1 is connected by theAC contactor 1 2 and therotary switch 4 to form a starting circuit, It is connected with thetest power supply 12; theswitching power supply 5, thetravel switch 6 and thebuzzer 7 are connected to form an alarm circuit, which is installed at the connection of the fence door of thepermanent fence 13; the infraredgrating beam detector 8, theintermediate relay 9, the intermediate relay Two 10 and AC contactor two 3 are connected in sequence to form a power-off circuit, and the infrared grating opposite-beam detector 8 is installed on the boundary of the front end test area of the standingfence 13; Connected to form a power-off hold circuit; the starting circuit is respectively connected with the alarm circuit, the power-off circuit and the power-off hold circuit, and the switchingpower supply 5 supplies power to the alarm circuit, the power-off circuit and the power-off hold circuit respectively.

所述行程开关6型号为D4V-8108SZ-N，蜂鸣器7为低功率的小型蜂鸣器。The model of thetravel switch 6 is D4V-8108SZ-N, and thebuzzer 7 is a small buzzer with low power.

所述红外光栅对射探测器8由发射杆及接收杆配对组成。The infrared grating on-beam detector 8 is composed of a pair of transmitting rods and receiving rods.

所述试验电源12包含空开及插座，空开及插座的数量为一个以上，满足试验用电要求。Thetest power supply 12 includes an air switch and a socket, and the number of the air switch and the socket is more than one, which meets the test power requirements.

还设有试验电源箱14，将总空开1、交流接触器一2、交流接触器二3、开关电源5、中间继电器一9、中间继电器二10和试验电源12安装在试验电源箱14的内部，旋钮开关4和复归按钮11安装在试验电源箱14的外表面。There is also a testpower supply box 14, and themain air switch 1, AC contactor one 2, AC contactor two 3, switchingpower supply 5, intermediate relay one 9, intermediate relay two 10 andtest power supply 12 are installed in the testpower supply box 14. Inside, therotary switch 4 and thereset button 11 are installed on the outer surface of thetest power box 14 .

一种试验区域周界报警及越限断电方法，采用上述装置，包含如下步骤：A method for alarming and power-off at the perimeter of a test area, using the above-mentioned device, comprising the following steps:

①在进行高压试验前的准备工作结束后，关闭常设围栏13的围栏门，开始试验；① After the preparatory work before the high-voltage test is completed, close the fence gate of thepermanent fence 13 and start the test;

②试验时先合上总空开1，报警电路、断电电路以及试验电源12同时带电，此时可开始进行试验；② During the test, first close themain air switch 1, the alarm circuit, the power-off circuit and thetest power supply 12 are charged at the same time, and the test can be started at this time;

③若试验过程中有人试图进入试验区域，打开常设围栏13的围栏门会带动行程开关6的转臂，行程开关6的触点动作导通报警电路，蜂鸣器7报警，提醒此人违规进入试验区域；③ If someone tries to enter the test area during the test, opening the fence door of thepermanent fence 13 will drive the arm of thetravel switch 6, the contact action of thetravel switch 6 will turn on the alarm circuit, and thebuzzer 7 will alarm, reminding the person to enter illegally. test area;

④若此人不理会报警并走进试验区域，会经过红外光栅对射探测器8，红外光栅对射探测器8的常开触点会先闭合然后分开，闭合时导通断电电路，此时中间继电器一9的导磁体（线圈）带电，衔铁被吸向导磁体，同时衔铁压动触点弹片，使其三个常开触点闭合，其中一个触点导通断电保持电路，在红外光栅对射探测器8的常开触点分开后可继续为中间继电器一9供电；其余两个触点闭合后为中间继电器二10供电，中间继电器二10导磁体（线圈）带电后，其常闭触点断开，致使交流接触器二3断电，试验电源12失电，试验被强制中断；④If the person ignores the alarm and walks into the test area, he will pass through the infrared grating opposite-beam detector 8. The normally open contacts of the infrared grating opposite-beam detector 8 will be closed first and then separated, and the power-off circuit will be turned on when closed. When the magnet conductor (coil) of theintermediate relay 9 is charged, the armature is attracted to the magnet, and at the same time the armature presses the contact shrapnel to close the three normally open contacts, and one of the contacts conducts the power-off holding circuit, and the infrared After the normally open contacts of the grating to-beam detector 8 are separated, it can continue to supply power to theintermediate relay 1 9; after the other two contacts are closed, theintermediate relay 2 10 is powered. The closed contact is disconnected, causing the AC contactor 23 to be powered off, thetest power supply 12 to lose power, and the test is forcibly interrupted;

⑤断电保持电路会将此状态一直保持下去，直到按下复归按钮11，中间继电器一9失电，常开触点复位，继而中间继电器二10失电，常闭触点复位，而后交流接触器二3导通，恢复对试验电源12的供电；⑤ The power-off holding circuit will keep this state until thereset button 11 is pressed, theintermediate relay 1 9 is de-energized, the normally open contact is reset, and then theintermediate relay 2 10 is de-energized, the normally closed contact is reset, and then the AC contact Thedevice 2 3 is turned on, and the power supply to thetest power supply 12 is restored;

⑥若试验过程中，任何试验人员离开试验区域，也会经过红外光栅对射探测器8，继而试验被强制中断，从而避免不良后果的产生。⑥ If any test personnel leave the test area during the test, they will also pass through the infraredgrating beam detector 8, and then the test is forcibly interrupted, thereby avoiding adverse consequences.

Claims (5)

Translated fromChinese

1.一种试验区域周界报警及越限断电装置，其特征在于：包含总空开（1）、交流接触器一（2）、交流接触器二（3）、旋钮开关（4）、开关电源（5）、行程开关（6）、蜂鸣器（7）、红外光栅对射探测器（8）、中间继电器一（9）、中间继电器二（10）、复归按钮（11）、试验电源（12）和常设围栏（13），所述总空开（1）通过交流接触器一（2）和旋钮开关（4）连接组成启动电路，并与试验电源（12）连接；开关电源（5）、行程开关（6）和蜂鸣器（7）连接组成报警电路，安装在常设围栏（13）的围栏门连接处；红外光栅对射探测器（8）、中间继电器一（9）、中间继电器二（10）和交流接触器二（3）依次连接组成断电电路，红外光栅对射探测器（8）安装在常设围栏（13）前端试验区域的边界；红外光栅对射探测器（8）、中间继电器一（9）和复归按钮（11）依次连接组成断电保持电路；启动电路分别与报警电路、断电电路和断电保持电路连接，开关电源（5）分别为报警电路、断电电路和断电保持电路供电。1. A test area perimeter alarm and limit power-off device, characterized in that: it comprises a total air switch (1), one (2) AC contactor, two (3) AC contactors, a rotary switch (4), Switching power supply (5), travel switch (6), buzzer (7), infrared grating beam detector (8), intermediate relay one (9), intermediate relay two (10), reset button (11), test The power supply (12) and the permanent fence (13), the total air switch (1) is connected to the AC contactor (2) and the rotary switch (4) to form a starting circuit, and is connected to the test power supply (12); the switching power supply ( 5) The travel switch (6) and the buzzer (7) are connected to form an alarm circuit, which is installed at the connection of the fence door of the permanent fence (13); the infrared grating beam detector (8), the intermediate relay one (9), The intermediate relay two (10) and the AC contactor two (3) are connected in turn to form a power-off circuit, and the infrared grating on-beam detector (8) is installed on the boundary of the front end test area of the permanent fence (13); the infrared grating on-beam detector ( 8), the intermediate relay one (9) and the reset button (11) are connected in turn to form a power-off holding circuit; the starting circuit is respectively connected with the alarm circuit, the power-off circuit and the power-off holding circuit, and the switching power supply (5) is the alarm circuit, The power-off circuit and the power-off hold circuit are powered.2.根据权利要求1所述的一种试验区域周界报警及越限断电装置，其特征在于：所述红外光栅对射探测器（8）由发射杆及接收杆配对组成。2 . The device for alarming and over-limit power-off at the perimeter of the test area according to claim 1 , wherein the infrared grating on-beam detector ( 8 ) is composed of a pair of a transmitting rod and a receiving rod. 3 .3.根据权利要求1所述的一种试验区域周界报警及越限断电装置，其特征在于：所述试验电源（12）包含空开及插座，空开及插座的数量为一个以上。3 . The device of claim 1 , wherein the test power supply ( 12 ) includes an air switch and a socket, and the number of the air switch and the socket is more than one. 4 .4.根据权利要求1所述的一种试验区域周界报警及越限断电装置，其特征在于：还设有试验电源箱（14），总空开（1）、交流接触器一（2）、交流接触器二（3）、开关电源（5）、中间继电器一（9）、中间继电器二（10）和试验电源（12）安装在试验电源箱（14）的内部，旋钮开关（4）和复归按钮（11）安装在试验电源箱（14）的外表面。4. A test area perimeter alarm and over-limit power-off device according to claim 1, characterized in that: a test power supply box (14) is also provided, a total air switch (1), an AC contactor (2) ), AC contactor two (3), switching power supply (5), intermediate relay one (9), intermediate relay two (10) and test power supply (12) are installed inside the test power supply box (14), the knob switch (4) ) and the reset button (11) are mounted on the outer surface of the test power box (14).5.一种试验区域周界报警及越限断电方法，采用权利要求1-4任意一项所限定的装置，其特征在于包含如下步骤：5. A test area perimeter alarm and a power-off method for exceeding the limit, adopting the device defined in any one of claims 1-4, is characterized in that comprising the steps:①在进行高压试验前的准备工作结束后，关闭常设围栏（13）的围栏门，开始试验；① After the preparatory work before the high-voltage test is completed, close the fence gate of the permanent fence (13) and start the test;②试验时先合上总空开，报警电路、断电电路以及试验电源（12）同时带电，此时可开始进行试验；② During the test, first close the main air circuit breaker, the alarm circuit, the power-off circuit and the test power supply (12) are charged at the same time, and the test can be started at this time;③若试验过程中有人试图进入试验区域，打开常设围栏（13）的围栏门会带动行程开关（6）的转臂，行程开关的触点动作导通报警电路，蜂鸣器（7）报警，提醒此人违规进入试验区域；③If someone tries to enter the test area during the test, opening the fence door of the permanent fence (13) will drive the arm of the travel switch (6), the contact action of the travel switch will turn on the alarm circuit, and the buzzer (7) will alarm. Remind the person to enter the test area illegally;④若此人不理会报警并走进试验区域，会经过红外光栅对射探测器（8），红外光栅对射探测器（8）的常开触点会先闭合然后分开，闭合时导通断电电路，此时中间继电器一（9）带电，衔铁被吸向导磁体，同时衔铁压动触点弹片，使其三个常开触点闭合，其中一个触点导通断电保持电路，在红外光栅对射探测器的常开触点分开后可继续为中间继电器一供电；其余两个触点闭合后为中间继电器二（10）供电，中间继电器二带电后，其常闭触点断开，致使交流接触器二（3）断电，试验电源（12）失电，试验被强制中断；④If the person ignores the alarm and walks into the test area, he will pass the infrared grating opposite-beam detector (8), the normally open contact of the infrared grating opposite-beam detector (8) will be closed first and then separated, and will be turned on and off when closed. Electric circuit, at this time, the intermediate relay one (9) is charged, the armature is attracted to the magnet, and at the same time the armature presses the contact shrapnel to close the three normally open contacts, and one of the contacts conducts the power-off holding circuit. After the normally open contacts of the grating to-beam detector are separated, it can continue to supply power to the first intermediate relay; after the other two contacts are closed, it supplies power to the second intermediate relay (10). As a result, the AC contactor two (3) is powered off, the test power supply (12) is powered off, and the test is forcibly interrupted;⑤断电保持电路会将此状态一直保持下去，直到按下复归按钮（11），中间继电器一失电，常开触点复位，继而中间继电器二失电，常闭触点复位，而后交流接触器二导通，恢复对试验电源的供电；⑤ The power-off hold circuit will keep this state until the reset button (11) is pressed, once the intermediate relay loses power, the normally open contact is reset, and then the second intermediate relay loses power, the normally closed contact is reset, and then the AC contact The second device is turned on, and the power supply to the test power supply is restored;⑥若试验过程中，任何试验人员离开试验区域，也会经过红外光栅对射探测器，继而试验被强制中断，从而避免不良后果的产生。⑥ If any test personnel leave the test area during the test, they will also pass through the infrared grating to reflect the detector, and then the test is forcibly interrupted, thereby avoiding adverse consequences.

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