A mine switch leakage testing device and a method of using the same

Abstract

The application discloses a mine switch leakage testing device and a use method thereof, and belongs to the field of mine switch leakage testing devices. The device comprises a quick plug connecting post, a power switch SA, a knob S1, a knob S2, a millisecond timer JSQ, a testing button QA-1, a testing button QA-2, a power indicator lamp HL, a transformer BK and resistors R1-R5. The device can test the reduction of the insulation of the load side of a switch, test whether the switch protection is in action when a human body contacts a live body, test the leakage locking resistance value of the switch, and comprehensively test the performance of the protector, the protection components and the protection circuit.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric power test equipment, and particularly relates to a mine-used switch leakage test device and a use method thereof. BACKGROUND

[0002] As one of the three protections in the coal mine, the leakage protection mainly functions to automatically cut off the power supply in time when the electric equipment has a leakage phenomenon, and to protect the safety of the human body and equipment. The leakage locking refers to the insulation monitoring of the power grid before the closing of the switch, and the closing cannot be performed when the insulation resistance of the power grid to the ground is lower than the locking value, thereby playing a locking role.

[0003] Since the tripping test of the low-voltage leakage protection must be performed once a day, the normal performance of the mine-used switch leakage protection directly relates to the safety of the human life. The daily leakage test can only simulate the experiment of the leakage locking and action of the protector by using the leakage test button of the switch itself. If the protection components, detection circuit lines of the switch appear faults, the protector cannot detect the existence of the faults even in the perfect condition, and the occurrence of such a situation will lead to the damage of the equipment or the electric shock accident of the human body. SUMMARY

[0004] In view of the problems of the switch leakage protector and the line faults, the present application provides a mine-used switch leakage test device, which can test the reduction of the insulation of the load side of the switch, the test of the action of the switch protection when the human body contacts the live body, and the detection of the leakage locking resistance value of the switch, and can comprehensively test the perfect performance of the protector, protection components and protection lines.

[0005] The technical solution adopted in this invention is as follows: a leakage current testing device for mining switches, comprising quick-connect terminals, a power switch SA, knobs S1 and S2, a millisecond timer JSQ, test buttons QA-1 and QA-2, a power indicator light HL, a transformer BK, and resistors R1-R5; the quick-connect terminals include quick-connect terminals U, V, W, and PE, wherein quick-connect terminals U, V, and W are all connected to the load side of the switch D1, D2, and D3, and quick-connect terminal PE is grounded; quick-connect terminal U is connected to knob S1 via the power switch SA, and normally open contacts S1-1, S1-2, S1-3, and S1-4 on knob S1 are respectively connected to resistors R1, R2, R3, and R4, wherein resistors R1 and R2 are respectively connected to knobs The normally open contact S2-1 in S2 is connected to the parallel resistors R3 and R4. Resistors R3 and R4 are both connected to the normally open contact S2-2 in knob S2. The quick-connect terminal V and quick-connect terminal W are respectively connected to the input terminal of transformer BK. The output terminal of transformer BK is connected to the millisecond timer JSQ. Button QA-1 is installed next to the quick-connect terminal V of transformer BK. One end of the power indicator HL is connected between the quick-connect terminal V and button QA-1, and the other end is connected to resistor R1 and series resistors R5 and R2 respectively. The quick-connect terminal PE is connected to the test button QA-2, and the test button QA-2 is connected to knob S2. Test button QA-1 and test button QA-2 are linked.

[0006] Furthermore, a button JSFW is installed on the millisecond timer JSQ, which is used to reset the timer JSQ.

[0007] This invention provides a method for using a leakage current testing device for mining switches, comprising the following steps:

[0008] Before testing, use alligator clips to hold the switch load side with the connecting wires; connect the connecting wires to the connecting wires respectively;

[0009] When performing leakage current interlocking tests, the operator should turn the knob S1 to the corresponding voltage level and the knob S2 to the S2-2 position according to the voltage level of the electrical equipment to be tested.

[0010] (1) When S1 is rotated to the S1-1 position and S2 is rotated to the S2-2 position, after confirming that it is normal, turn on the power switch SA of the test device and press the test button QA-1. The main circuit of the switch detects the actual resistance value. If leakage lockout is displayed, the switch is normal. Otherwise, it needs to be checked and repaired.

[0011] (2) S1 is rotated to S1-2 position, S2 is rotated to S2-2 position, after confirming normal, the power switch SA of test device is opened, the test button QA-1 is pressed, the actual resistance value is detected by the main circuit of switch, if the display of leakage lockout is shown, the switch is normal, otherwise, it needs to be checked and maintained;

[0012] When the leakage action test is carried out, the operator rotates the knob S1 to the corresponding voltage level according to the voltage level of the electrical equipment to be tested, and rotates S2 to S2-1 position;

[0013] (1) S1 is rotated to S1-1 position, S2 is rotated to S2-1 position, after confirming normal, the closing operation is carried out on the equipment to be tested, the power switch SA of test device is opened, the power indicator HL is bright, the test button QA-1 is pressed, the millisecond timer JSQ works, the actual resistance value is detected by the main circuit of switch, the switch leakage fault is tripped, the power indicator HL of test device is extinguished, the action time is recorded through the timer JSQ, then the timing button is pressed to reset the timer, the power switch of test device is closed, the switch passes the test and is normal, otherwise, it needs to be checked and maintained;

[0014] (2) S1 is rotated to S1-2 position, S2 is rotated to S2-1 position, after confirming normal, the closing operation is carried out on the equipment to be tested, the power switch SA of test device is opened, the power indicator HL is bright, the test button QA-1 is pressed, the millisecond timer JSQ works, the actual resistance value is detected by the main circuit of switch, the switch leakage fault is tripped, the power indicator HL of test device is extinguished, the action time is recorded through the timer JSQ, then the timing button is pressed to reset the timer, the power switch of test device is closed, the switch passes the test and is normal, otherwise, it needs to be checked and maintained.

[0015] The application has the following beneficial effects:

[0016] 1. Real leakage test; the test is carried out through the leakage test device, the perfect performance of the internal leakage element of the switch can be detected, and the leakage damage accident caused by the leakage protection fault of the switch and the like can be avoided.

[0017] 2. Quick and intuitive test; the power indicator and the timer are reasonably distributed, the indication is clear, the power indicator is bright when the test device is electrified, the leakage action time is directly observed after the test is completed, and the test state is directly reflected. The millisecond timer is used for collecting the leakage action time of the switch protector, and the collected value can be compared with the set value of the protector, and the perfect performance of the protector can be tested.

[0018] 3. Convenient and quick operation; the control panel has a knob, and the test can be freely switched according to the need. When the device is connected with the switch, the quick plug and the alligator clip are used, which is convenient and quick, and the work efficiency is greatly improved.

[0019] 4. Comprehensive testing functions; capable of performing leakage current interlocking and leakage current action tests on electrical equipment with two voltage levels, 127V and 660V, including low-voltage mining equipment such as power supply switches, starters, and lighting protection devices, and ensuring that they do not interfere with each other. Attached Figure Description

[0020] Figure 1 This is the circuit diagram of the present invention. Detailed Implementation

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] like Figure 1 As shown, this invention is a leakage current testing device for mine switches, including quick-connect terminals U, V, W, PE, a power switch SA, knobs S1 and S2, a millisecond timer JSQ, test buttons QA-1 and QA-2, a power indicator light HL, a transformer BK, and resistors R1-R5. The quick-connect terminals U, V, and W are all connected to the load side of the switch D1, D2, and D3, respectively, and the quick-connect terminal PE is grounded. The quick-connect terminal U is connected to the knob S1 via the power switch SA. The normally open contacts S1-1, S1-2, S1-3, and S1-4 on the knob S1 are respectively connected to resistors R1, R2, R3, and R4. Resistors R1 and R2 are respectively connected to the normally open contact S2-1 in the knob S2 and the parallel resistors R3 and R4. R4 is connected to the normally open contact S2-2 in knob S2; ​​the quick-connect terminal V and quick-connect terminal W are respectively connected to the input terminal of transformer BK, and the output terminal of transformer BK is connected to millisecond timer JSQ; a button JSFW is installed on the millisecond timer JSQ, and the button JSFW is used to reset the timer; button QA-1 is installed next to the quick-connect terminal V of transformer BK; one end of the power indicator HL is connected between the quick-connect terminal V and button QA-1, and the other end is connected to resistor R1 and series resistors R5 and R2 respectively; the quick-connect terminal PE is connected to test button QA-2, and test button QA-2 is connected to knob S2; ​​test button QA-1 and test button QA-2 are linked.

[0023] The working principle of this invention is:

[0024] After the switch load side and the leakage current testing device are connected, D1 and U are turned on. Through the power switch of the testing device, the states of S1 and S2 are selected according to the testing requirements.

[0025] (1) Rotate to S1-1 and S2-2, that is, carry out 127V leakage lockout test, D1 and U are turned on, the power supply switch is closed, pass through normally open point S1-1 (127V), resistance R1, normally open point S2-2 (lockout value), press the test button QA, normally open point QA-1 becomes normally closed point (QA-2 simultaneously becomes normally closed point, the millisecond level timer starts timing), PE and the ground are connected, the actual resistance value of the switch load side is detected, and then the test purpose is achieved.

[0026] (2) Rotate to S1-1 and S2-1, that is, carry out 127V leakage action test, D1 and U are turned on, the power supply switch is closed, pass through normally open point S1-1 (127V), resistance R1, normally open point S1-3, resistance R3, normally open point S2-1 (action value). Press the test button QA, normally open point QA-1 becomes normally closed point (QA-2 simultaneously becomes normally closed point, the millisecond level timer starts timing), PE and the ground are connected, the actual resistance value of the switch load side is detected, and then the test purpose is achieved.

[0027] (3) Rotate to S1-2 and S2-2, that is, carry out 660V leakage lockout test, D1 and U are turned on, the power supply switch is closed, pass through normally open point S1-2 (660V), resistance R2, normally open point S2-2 (lockout value). Press the test button QA, normally open point QA-1 becomes normally closed point (QA-2 simultaneously becomes normally closed point, the millisecond level timer starts timing), PE and the ground are connected, the actual resistance value of the switch load side is detected, and then the test purpose is achieved.

[0028] (4) Rotate to S1-2 and S2-1, that is, carry out 660V leakage action test, D1 and U are turned on, the power supply switch is closed, pass through normally open point S1-2 (660V), resistance R2, normally open point S1-4, resistance R4, normally open point S2-1 (action value). Press the test button QA, normally open point QA-1 becomes normally closed point (QA-2 simultaneously becomes normally closed point, the millisecond level timer starts timing), PE and the ground are connected, the actual resistance value of the switch load side is detected, and then the test purpose is achieved.

[0029] The use method of the application is:

[0030] The operating personnel first use the connecting wire to clamp the switch load side (D1, D2, D3, grounding bolt) by using the alligator clip, and the test device is quickly connected to (U, V, W, PE) by using the fast plug type terminal post.

[0031] When the leakage lockout test is performed, the operator selects the voltage level and the content to be tested according to the switch, and rotates the knob S1, S2 to the required position. After confirming the normality, the test device power switch is turned on, and the test button is pressed. The switch main circuit detects the actual resistance value. If the leakage lockout is displayed, the switch is normal, otherwise it needs to be checked and repaired.

[0032] When the leakage action test is performed, the operator selects the voltage level and the content to be tested according to the switch, and rotates the knob S1, S2 to the required position. After confirming the normality, the switch is closed, the test device power switch is turned on, the power indicator light is on, the test button is pressed, the timer works, the switch main circuit detects the actual resistance value, the switch leakage fault trips, the test device power indicator light is off, the action time is recorded by the timer, then the timer is reset, the test device power switch is turned off, the switch passes the test performance, otherwise it needs to be checked and repaired.

Claims

1. A mine switch leakage testing device, characterized in that: It includes fast plug terminal, power switch SA, knob S1, knob S2, millisecond timer JSQ, test button QA-1, test button QA-2, power indicator HL, transformer BK and resistors R1-R5; the fast plug terminal includes fast plug terminal U, V, W and PE, the fast plug terminal U, V and W are connected with switch load side D1, D2 and D3, and the fast plug terminal PE is grounded; the fast plug terminal U is connected with power switch SA and knob S1, the normally open points S1-1, S1-2, S1-3 and S1-4 on knob S1 are connected with resistors R1, R2, R3 and R4 respectively, wherein resistor R1 and R2 are connected with normally open point S2-1 in knob S2 and parallel resistors R3 and R4 respectively, and resistors R3 and R4 are connected with normally open point S2-2 in knob S2; the fast plug terminal V and W are connected with input end of transformer BK, and the output end of transformer BK is connected with millisecond timer JSQ; the millisecond timer JSQ is provided with button JSFW, which is used for resetting timer JSQ; button QA-1 is installed beside fast plug terminal V of transformer BK; one end of power indicator HL is connected between fast plug terminal V and button QA-1, and the other end is connected with resistor R1 and series resistors R5 and R2 respectively; fast plug terminal PE is connected with test button QA-2, and test button QA-2 is connected on knob S2; test button QA-1 and test button QA-2 are linked.

2. A method of using the device according to claim 1, characterized in that It includes the following steps: Before testing, use the connecting wire to hold the switch load side with alligator clip; the connecting wire is connected on the connecting wire respectively; When carrying out leakage lockout test, the operator rotates knob S1 to the corresponding voltage level and rotates S2 to S2-2 position according to the voltage level of the electrical equipment to be tested; (1) when S1 is rotated to S1-1 position and S2 is rotated to S2-2 position, after confirming normal, open the power switch SA of the test device, press the test button QA-1, the switch main circuit detects the actual resistance value, if the leakage lockout is displayed, the switch is normal, otherwise it needs to be checked and repaired; (2) when S1 is rotated to S1-2 position and S2 is rotated to S2-2 position, after confirming normal, open the power switch SA of the test device, press the test button QA-1, the switch main circuit detects the actual resistance value, if the leakage lockout is displayed, the switch is normal, otherwise it needs to be checked and repaired; When carrying out leakage action test, the operator rotates knob S1 to the corresponding voltage level and rotates S2 to S2-1 position according to the voltage level of the electrical equipment to be tested; (1) S1 rotates to S1-1 position, S2 rotates to S2-1 position, after confirming normal, the closing operation is carried out to the device to be tested, the power switch SA of the testing device is turned on, the power indicator HL is bright, the testing button QA-1 is pressed, the millisecond timer JSQ works, the actual resistance value is detected by the main circuit of the switch, the switch trips for leakage fault, the power indicator HL of the testing device is off, the action time is recorded by the timer JSQ, then the timing button is pressed to reset the timer, the power switch of the testing device is turned off, the switch passes the test and its performance is normal, otherwise it needs to be checked and repaired; (2) S1 rotates to S1-2 position, S2 rotates to S2-1 position, after confirming normal, the closing operation is carried out to the device to be tested, the power switch SA of the testing device is turned on, the power indicator HL is bright, the testing button QA-1 is pressed, the millisecond timer JSQ works, the actual resistance value is detected by the main circuit of the switch, the switch trips for leakage fault, the power indicator HL of the testing device is off, the action time is recorded by the timer JSQ, then the timing button is pressed to reset the timer, the power switch of the testing device is turned off, the switch passes the test and its performance is normal, otherwise it needs to be checked and repaired.

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