Insulation monitoring and detection system and detection method for flameproof high-voltage power distribution equipment used in mines

Abstract

The present invention relates to an insulation monitoring detection system and detection method for a flameproof high-voltage power distribution device for mining, comprising a flameproof high-voltage power distribution device for mining, a timer trigger switch, a timer, a controller, a display screen, a precision resistance switching device, a loop resistance switching switch, an insulation resistance switching switch and a control power supply. The present invention solves the error caused by human operation in the measurement of the insulation monitoring protection action time of the flameproof high-voltage power distribution device for mining in JB / T 8739-2015, and has the characteristics of accurate measurement time, high precision and convenient control.

Description

Technical field:

[0001] The invention relates to the technical field of electronic power detection and testing, and in particular to an insulation monitoring and detection system and a detection method for a flameproof high-voltage power distribution device for mining. Background technology:

[0002] Insulation monitoring of flameproof high-voltage power distribution devices for mines is a must-test item in JB / T 8739-2015 (flameproof high-voltage power distribution devices for mines). This item mainly monitors the insulation status of high-voltage cables in coal mines, which mainly includes two conditions: ① loop resistance between the monitoring line and the ground wire; ② insulation resistance between the monitoring line and the ground wire, as well as the action time of the above two conditions.

[0003] Due to the environmental characteristics of coal mines, high-voltage cables gradually age or are damaged by external forces during operation. Monitoring the insulation condition of high-voltage cables by monitoring the loop resistance and insulation resistance between the monitoring line and the ground wire is a common practice for insulation monitoring of high-voltage cables in coal mines. Since the insulation degradation of the cable is a slowly changing process or is damaged by external factors, real-time monitoring of the insulation resistance value of the cable and real-time tripping of the high-voltage distribution device are problems that must be solved by the high-voltage distribution device. The action time requirement must be <0.1s. How to accurately measure the accurate action time of the switch when an insulation monitoring fault occurs during the operation of the switch is a problem that needs to be solved in the current type test of explosion-proof high-voltage distribution devices for mines; there is currently no test system similar to this product. Summary of the invention:

[0004] The present invention applies a control voltage of AC100V to the control circuit of a flameproof high-voltage power distribution device for mining, and combines the flameproof high-voltage power distribution device for mining, a timer trigger switch, a timer, a controller, a display screen, a precision resistance switching device, a loop resistance switching switch, an insulation resistance switching switch, a control power supply and other equipment to form a complete set of control and measurement. The test result is accurate and reliable, and the action time measurement accuracy is high.

[0005] The purpose of the present invention is to provide an insulation monitoring and detection system and detection method for a flameproof high-voltage distribution device for mining, which has the characteristics of accurate measurement time, high precision and convenient control, and solves the error caused by human operation of simulating cable insulation failure during testing of flameproof high-voltage distribution devices for mining. The main reason for the error is that it is impossible to accurately capture the action time of the high-voltage distribution device when cutting off the faulty cable when the insulation monitoring failure occurs during the operation of the high-voltage cable.

[0006] The present invention is achieved through the following technical solutions:

[0007] The invention discloses an insulation monitoring and detection system for a flameproof high-voltage power distribution device for mining, comprising a flameproof high-voltage power distribution device for mining (PJG), a timer trigger switch, a timer, a controller, a display screen, a precision resistance switching device (ZR), a loop resistance switching switch, an insulation resistance switching switch and a control power supply.

[0008] The control power supply is respectively connected to the timer and the controller;

[0009] Wherein, the controller is connected to a mine flameproof high-voltage power distribution device, a timer trigger switch, a timer, a display screen, a precision resistance switching device, a loop resistance switching switch, and an insulation resistance switching switch;

[0010] The loop resistance switching switch and insulation resistance switching switch are switches for inputting, cutting off and measuring the resistance value of the precision resistance switching device;

[0011] The chronograph trigger switch is a trigger switch for starting the chronograph to time;

[0012] The precision resistance switching device is connected to the mine flameproof high-voltage power distribution device and the controller to generate the resistance of the mine flameproof high-voltage power distribution device when the insulation monitoring fails;

[0013] The display screen displays the resistance value and the action time of the precision resistance switching device or displays the action time through a timer;

[0014] The display screen displays the working status of the loop resistance switch and the insulation resistance switch.

[0015] The present invention also provides a detection method for the above-mentioned mine flameproof high-voltage power distribution device insulation monitoring detection system, comprising the following steps:

[0016] (1) Before conducting the insulation monitoring test, the timer and controller are powered by the control power supply, and the three-phase AC100V power supply is connected to the mine flameproof high-voltage distribution device;

[0017] (2) When the loop resistance switch is turned on, the controller records the state of the loop resistance switch and displays it on the display screen, and serves as a basis for further judgment; when the insulation resistance switch is turned on, the controller records the state of the insulation resistance switch and displays it on the display screen, and serves as a basis for further judgment; wherein the loop resistance switch and the insulation resistance switch are mutually exclusive;

[0018] (3) When debugging the insulation resistance, switch the insulation resistance switch to the debugging position, and slowly adjust the resistance value of the precision resistance switching device connected in parallel at both ends of the insulation monitoring detection terminals of the mine flameproof high-voltage power distribution device until the insulation monitoring of the mine flameproof high-voltage power distribution device does not display insulation faults;

[0019] (4) Connect the normally open auxiliary switch of the flameproof high-voltage power distribution device for mining use to the controller, set the timing mode of the controller, and the insulation resistance timing mode is "start timing when closed, and stop timing when the flameproof high-voltage power distribution device for mining use is disconnected"; close the flameproof high-voltage power distribution device for mining use;

[0020] (5) Test the insulation resistance action time: close the contacts of the insulation resistance switch; trigger the timer to start timing, the mine explosion-proof high-voltage power distribution device will trip quickly, and the timer will record the action time just now; switch the insulation resistance switch to the measurement state, and the controller measures the precision resistance switching device to measure and display the input resistance value;

[0021] (6) When conducting a loop resistance test, remove one end of the insulation monitoring detection terminal of the mine flameproof high-voltage power distribution device, and connect the precision resistance switching device in series in the insulation monitoring detection loop of the mine flameproof high-voltage power distribution device;

[0022] (7) Connect the auxiliary switch of the flameproof high-voltage power distribution device for mines to the controller, set the timing mode of the controller, and set the loop resistance timing mode to "start timing when disconnected, and stop timing when the flameproof high-voltage power distribution device for mines is disconnected"; close the flameproof high-voltage power distribution device for mines;

[0023] (8) When debugging the loop resistance, switch the insulation resistance switch to the debugging position, and slowly adjust the resistance value of the precision resistance switching device connected in series with the insulation monitoring detection terminal of the mine flameproof high-voltage power distribution device until the insulation monitoring of the mine flameproof high-voltage power distribution device does not show a loop fault;

[0024] (9) Test the loop resistance action time: Trigger the timer and start timing. The mine flameproof high-voltage power distribution device will trip quickly and the action time will be recorded by the timer.

[0025] (10) Switch the loop resistance switch to the measurement state, and the controller measures the resistance value input by the precision resistance switching device;

[0026] (11) The measured resistance value is displayed on the display screen.

[0027] The beneficial effects of the present invention are as follows: the present invention solves the error caused by human operation in the measurement process of the insulation monitoring protection action time of JB / T 8739-2015-mine flameproof high-voltage distribution device, and has the characteristics of accurate measurement time, high precision and convenient control. Description of the drawings:

[0028] Figure 1 It is a structural schematic diagram of the insulation monitoring and detection system of the mine flameproof high-voltage power distribution device of the present invention;

[0029] Figure 2 It is a circuit principle diagram of the insulation monitoring and detection system of the mine flameproof high-voltage power distribution device of the present invention; Specific implementation method:

[0030] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0031] like Figure 1 The insulation monitoring and detection system of a flameproof high-voltage power distribution device for mining is shown, comprising a flameproof high-voltage power distribution device for mining, a timer trigger switch, a timer, a controller, a display screen, a precision resistance switching device, a loop resistance switching switch, an insulation resistance switching switch and a control power supply.

[0032] Combination Figure 2 As shown, the detection method of the insulation monitoring and detection system of the mine flameproof high-voltage distribution device is as follows:

[0033] Before the insulation monitoring test is carried out, the timer 3 and the controller 1 are powered by the control power supply 2; the three-phase AC100V power supply is connected to the mine flameproof high-voltage power distribution device 5;

[0034] The connection terminals X1 and X2 of the flameproof high-voltage power distribution device 5 for mining use have a terminal matching resistor R, i.e., a sampling resistor, which is exclusive to the flameproof high-voltage power distribution device 5 for mining use;

[0035] The insulation resistance switch SA1 is mainly used to simulate a mode selection of insulation resistance fault of a mine flameproof high-voltage power distribution device (PJG). When this mode is turned on, the controller records the state of the switch and displays it on the display screen as a basis for further judgment.

[0036] The loop resistance switch SA2 is mainly used to simulate a loop resistance fault in a mining flameproof high-voltage power distribution device (PJG). When this mode is turned on, the controller records the state of the switch and displays it on the display screen as a basis for further judgment.

[0037] The insulation resistance switch SA1 and the loop resistance switch SA2 are mutually exclusive;

[0038] When debugging the insulation resistance, switch the insulation resistance switch SA1 to the debugging position, close the contacts ③④ of the insulation resistance switch SA1, and disconnect the contacts ①②, ⑤⑥. Slowly adjust the resistance of the precision resistance switching device 6 connected in parallel at both ends of the insulation monitoring detection terminal of the mine flameproof high-voltage power distribution device (PJG) to R1 until the insulation monitoring of the mine flameproof high-voltage power distribution device does not show insulation fault;

[0039] Further, the auxiliary switch (PJG / FK) of the mine flameproof high-voltage power distribution device (PJG) is connected to the controller;

[0040] The timing mode of the controller is further set, and the insulation resistance timing mode is "start timing when closed, and stop timing when the mine flameproof high-voltage power distribution device is disconnected";

[0041] Further, the mine flameproof high-voltage power distribution device (PJG) is closed;

[0042] Further test the insulation resistance action time: the insulation resistance switching switch SA1 contacts ③④ are disconnected, and ⑤⑥, ⑦⑧ are closed; the triggering timer triggers the switch SB, and the triggering timer starts timing. The mine flameproof high-voltage power distribution device will trip quickly, and the action time just now will be recorded by the timer;

[0043] Further switch the insulation resistance switch SA1 to the measuring state;

[0044] Further, the contacts ③④, ⑤⑥, ⑦⑧ of the insulation resistance switching switch SA1 are disconnected, and ①② are closed, and the controller measures the precision resistance switching device (ZR) and displays the input resistance value;

[0045] When conducting the loop resistance test, disassemble one end of the insulation monitoring detection terminal of the mine flameproof high-voltage power distribution device, and connect the precision resistance switching device in series in the insulation monitoring detection loop of the mine flameproof high-voltage power distribution device;

[0046] Further, the auxiliary switch (PJG / FK) of the mine flameproof high-voltage power distribution device (PJG) is connected to the controller;

[0047] Further set the timing mode of the controller, the loop resistance timing mode is "start timing when disconnected, stop timing when the mine flameproof high-voltage power distribution device is disconnected";

[0048] To further debug the loop resistance, switch the loop resistance switch SA2 to the debugging position, and slowly adjust the resistance of the precision resistance switching device (ZR) in series with the insulation monitoring detection terminal of the mine flameproof high-voltage power distribution device (PJG) to R2, until the insulation monitoring of the mine flameproof high-voltage power distribution device does not show a loop fault;

[0049] Further, the mine flameproof high-voltage power distribution device (PJG) is closed;

[0050] Further test the loop resistance action time: the loop resistance switching switch SA2 contacts ⑦⑧ are closed;

[0051] Further test the loop resistance action time: trigger the timer trigger switch SB to start timing, the mine flameproof high-voltage power distribution device will trip quickly, and the timer will record the action time just now;

[0052] Further, the loop resistance switch (SA2) is switched to the measurement state;

[0053] The loop resistance switching switch (SA2) further opens ⑤⑥, ⑦⑧, and closes ①②, and the controller measures the resistance value input by the precision resistance switching device (ZR);

[0054] The measured resistance value is further displayed on the display screen 4 to complete the detection.

[0055] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A detection method for an insulation monitoring and detection system of a flameproof high-voltage power distribution device for mining, characterized in that: The insulation monitoring and detection system for flameproof high-voltage power distribution device for mines includes flameproof high-voltage power distribution device for mines, a timer trigger switch, a timer, a controller, a display screen, a precision resistance switching device, a loop resistance switching switch, an insulation resistance switching switch and a control power supply; The control power supply is respectively connected to the timer and the controller, the controller is respectively connected to the mine flameproof high-voltage power distribution device, the timer trigger switch, the timer, the display screen, the precision resistance switching device, the loop resistance switching switch, and the insulation resistance switching switch, the timer trigger switch is connected to the timer, and the precision resistance switching device is connected to the mine flameproof high-voltage power distribution device; The connection terminals of the flameproof high-voltage power distribution device for mining are provided with terminal matching resistors; The auxiliary switch access controller of the mine flameproof high-voltage power distribution device; The detection method of the insulation monitoring detection system of the flameproof high-voltage power distribution device for mining comprises the following steps: (1) Before conducting the insulation monitoring test, the timer and controller are powered by the control power supply, and the three-phase AC100V power supply is connected to the mine flameproof high-voltage distribution device; (2) When the loop resistance switch is turned on, the controller records the state of the loop resistance switch and displays it on the display screen, which also serves as a basis for further judgment; when the insulation resistance switch is turned on, the controller records the state of the insulation resistance switch and displays it on the display screen, which also serves as a basis for further judgment; wherein, the loop resistance switch and the insulation resistance switch are mutually exclusive; (3) When debugging the insulation resistance, switch the insulation resistance switch to the debugging position, and slowly adjust the resistance value of the precision resistance switching device connected in parallel at both ends of the insulation monitoring detection terminals of the mine flameproof high-voltage power distribution device until the insulation monitoring of the mine flameproof high-voltage power distribution device does not display insulation faults; (4) Connect the auxiliary switch of the flameproof high-voltage power distribution device for mines to the controller, set the timing mode of the controller, and the insulation resistance timing mode is "start timing when closed, and stop timing when the flameproof high-voltage power distribution device for mines is disconnected"; close the flameproof high-voltage power distribution device for mines; (5) Test the insulation resistance action time: close the contacts of the insulation resistance switch; trigger the timer and start timing. The mine flameproof high-voltage power distribution device will trip quickly and record the action time just now through the timer; switch the insulation resistance switch to the measurement state, and the controller measures the precision resistance switching device to measure and display the input resistance value; (6) When conducting a loop resistance test, remove one end of the insulation monitoring detection terminal of the mine flameproof high-voltage power distribution device and connect the precision resistance switching device in series in the insulation monitoring detection loop of the mine flameproof high-voltage power distribution device; (7) Connect the auxiliary switch of the flameproof high-voltage power distribution device for mines to the controller, set the timing mode of the controller, and the loop resistance timing mode to "start timing when disconnected, and stop timing when the flameproof high-voltage power distribution device for mines is disconnected"; close the flameproof high-voltage power distribution device for mines; (8) When debugging the loop resistance, switch the loop resistance switch to the debugging position, and slowly adjust the resistance value of the precision resistance switching device connected in series with the insulation monitoring detection terminal of the mine flameproof high-voltage power distribution device until the insulation monitoring of the mine flameproof high-voltage power distribution device does not show a loop fault; (9) Test the loop resistance action time: trigger the timer trigger switch to start timing, the mine flameproof high-voltage power distribution device will trip quickly, and the action time just now will be recorded by the timer; (10) Switch the loop resistance switch to the measurement state, and the controller measures the resistance value input by the precision resistance switching device; (11) The measured resistance value is displayed on the display.

2. The detection method of the insulation monitoring detection system of the flameproof high-voltage power distribution device for mining according to claim 1 is characterized in that: The mine flameproof high-voltage power distribution device is connected to a three-phase AC100V power supply.

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