CN103983831A - Voltmeter and voltmeter pen special for protecting pressure plate - Google Patents

Abstract

The invention relates to a special voltmeter and test leads for protecting a pressure plate, belonging to the technical field of electric power detection equipment. The technical solution is: data acquisition module (12), analog-to-digital conversion module (13), single-chip microcomputer (14), function self-inspection module (15), data display module (16), and voice broadcast module (17) are arranged on the voltmeter ( 1) Inside, the voltmeter display (2), horn (3), self-test button (4), power switch (5), test lead negative jack (6), test lead positive jack (7) are set on the voltmeter of the outer surface. The present invention overcomes the disadvantages of the existing multimeter, such as the possibility of using the wrong gear, poor fixation of the grounding point, difficulty in observing the reading, and inability to detect whether the function is normal, etc., when the existing multimeter measures the voltage at both ends of the pressure plate, reduces false tripping factors, and increases the automatic detection of the voltmeter function, increase the voice broadcast function of the voltmeter, and reduce the number of measuring personnel by improving the structure of the voltmeter pen.

Description

A special voltmeter and test leads for protecting the pressure plate

technical field

The invention relates to a special voltmeter and test leads for protecting a pressure plate, belonging to the technical field of electric power detection equipment.

Background technique

In the power system, when the circuit breaker is put into the protective trip outlet pressure plate when it is in the closing position, if there is a fault in the relay protection or the trip circuit of the automatic device, such as the trip circuit is connected to the wrong line, there is a ground point, or the protection setting value is too low, if this If the trip outlet pressure plate is put into operation at the same time, the trip circuit may be connected and the circuit breaker may malfunction. Therefore, the on-site regulations of the substation clearly stipulate that: for the circuit breaker in operation, before putting into the protection or automatic device pressure plate, use a high internal resistance voltmeter to measure that there is no voltage at both ends of the protection pressure plate before putting it into protection or automatic device pressure plate. Practice has proved that measuring the voltage across the pressure plate of the protection or automatic device is an effective measure to prevent false tripping. However, in the actual operation process, when measuring the voltage at both ends of the pressure plate of the protection or automatic device, the phenomenon of circuit breaker malfunction due to the misuse of the current of the multimeter to block the voltage at both ends of the pressure plate often occurs. Conventional multimeters do not have the self-check function, and it is difficult to judge whether the readings of the multimeter are accurate before use. Therefore, due to multimeter failure, there have been cases where the voltage at both ends of the protection or automatic device pressure plate was not detected at the same time, causing the circuit breaker to trip by mistake; When using a multimeter to measure the voltage at both ends of the protective or automatic device pressure plate, the grounding point is usually selected on the screw of the protective screen cabinet. The conventional multimeter pen needs another person to cooperate to fix it on the screw or grounding wire of the protective screen cabinet; When reading the multimeter, it is inconvenient to observe the display reading due to the problem of light or observation angle, which causes inconvenience in use.

Contents of the invention

The object of the present invention is to provide a special voltmeter and test leads for protecting the pressure plate, which adopts a self-check module to detect whether the voltmeter is in good condition before use, and the crocodile clip test leads with circular serrations at the mouth can be clamped more conveniently and reliably on the side of the protective screen cabinet Screws or ground wires, adding the voltage voice broadcast function can facilitate reading and solve the above-mentioned problems in the background technology.

The technical solution of the present invention is: a special voltmeter and test leads for protecting the pressure plate, including a voltmeter, a voltmeter display screen, a horn, a self-test button, a power switch, a test lead negative jack, a test lead positive jack, a needle test lead, an alligator clip-type test leads, data acquisition module, analog-to-digital conversion module, single-chip microcomputer, functional self-inspection module, data display module and voice broadcast module, the data acquisition module, analog-to-digital conversion module, single-chip microcomputer, functional self-inspection module, data display module, The voice broadcast module is arranged inside the voltmeter, and the data acquisition module, the analog-to-digital conversion module, and the single-chip microcomputer are connected in sequence, and the output terminals of the single-chip microcomputer are respectively connected with the function self-check module, the data display module, and the voice broadcast module. , self-test button, power switch, test lead negative jack, test lead positive jack are set on the outer surface of the voltmeter, the voltmeter display is connected to the data display module, the speaker is connected to the voice broadcast The detection modules are connected to each other, the needle-type test leads are connected to the voltmeter through the positive jack of the test lead, and the crocodile-clip test leads are connected to the voltmeter through the negative-pole jack of the test lead; The mouth of the crocodile clip has a sawtooth structure.

The beneficial effect of the present invention is: when the existing multimeter measures the voltage at both ends of the pressure plate, it may use the wrong gear, the ground point is not fixed, the reading is not easy to observe, and it is impossible to detect whether the function is normal, etc., reducing the false tripping factors. The special voltmeter can prevent misuse of other gears; the automatic detection function of the voltmeter can be added to check whether the voltmeter is in good condition before use; the voice broadcast function of the voltmeter can be added to obtain the detection results conveniently; Surveyor.

Description of drawings

Fig. 1 is a structural diagram of the present invention;

Fig. 2 is an external structural diagram of the present invention;

Fig. 3 is the structural diagram of needle type test lead of the present invention;

Fig. 4 is the structural diagram of alligator clip type test lead of the present invention;

Fig. 5 is the structural diagram of the tip of the alligator clip type test lead of the present invention;

In the figure: voltmeter 1, voltmeter display 2, speaker 3, self-test button 4, power switch 5, test lead negative jack 6, test lead positive jack 7, needle test lead 8, crocodile clip test lead 9, carp clip Middle part 10, crocodile clamp mouth part 11, data acquisition module 12, analog-to-digital conversion module 13, single-chip microcomputer 14, function self-test module 15, data display module 16, voice broadcast module 17, voltage signal 18.

Detailed ways

The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

A special voltmeter and test leads for protecting a pressure plate, including a voltmeter 1, a voltmeter display screen 2, a speaker 3, a self-test button 4, a power switch 5, a test lead negative jack 6, a test lead positive jack 7, a needle test lead 8, Alligator clip type probe 9, data acquisition module 12, analog-to-digital conversion module 13, single-chip microcomputer 14, function self-inspection module 15, data display module 16 and voice broadcast module 17, described data acquisition module 12, analog-to-digital conversion module 13, single-chip microcomputer 14, function self-inspection module 15, data display module 16, voice broadcast module 17 are arranged on the inside of voltmeter 1, and data collection module 12, analog-to-digital conversion module 13, single-chip microcomputer 14 are connected successively, and the output end of single-chip microcomputer 14 is connected with function self-contained respectively. The detection module 15, the data display module 16, and the voice broadcast module 17 are connected to each other, and the voltmeter display screen 2, the speaker 3, the self-test button 4, the power switch 5, the test lead negative pole jack 6, and the test lead positive pole jack 7 are arranged on the voltmeter 1 The outer surface of the voltmeter, the voltmeter display screen 2 is connected to the data display module 16, the speaker 3 is connected to the voice broadcast module 17, the self-test button 4 is connected to the function self-test module 15, and the needle test lead 8 is connected to the test lead positive jack 7. It is connected with the voltmeter 1, and the alligator clip test lead 9 is connected with the voltmeter 1 through the test lead negative jack 6.

The alligator-clip test lead 9 includes a carp-clip middle part 10 and an alligator-clip mouth 11, and the alligator-clip mouth 11 is provided with a sawtooth structure.

In practical application, according to the accompanying drawing 2, turn on the power switch 5 of the voltmeter 1, then the screen will light up after a few seconds, press the self-test button 4, the self-test circuit will start, and compare the voltmeter 1 with its own battery after a stable If the voltage error is less than or equal to 5%, the voltmeter display 2 will display the Chinese characters "Voltmeter is normal" and the voltmeter can be used normally. If the error value is greater than 5%, the voltmeter display screen 2 will display the Chinese characters "Voltmeter is abnormal, please check carefully", then the voltmeter 1 cannot be used, and further inspection or replacement of the voltmeter is required.

According to accompanying drawing 3, if the self-test of the voltmeter is normal, then the alligator clip mouth portion 11 of the alligator clip type test pen 9 is clipped to the screw on the protective screen cabinet door or the middle part 10 of the alligator clip is clipped to the ground wire on the protective screen cabinet door, Point the tip of the needle test pen 8 to the pressure plate to be measured. At this time, the pressure plate of the voltmeter and the ground terminal form a loop, and the voltmeter display screen 2 displays the ground voltage of the pressure plate.

Claims (1)

1. protection pressing plate specialized voltages table and a test pencil, is characterized in that: comprise voltage table (1), voltage table display screen (2), loudspeaker (3), self-inspection button (4), power switch (5), test pencil negative pole jack (6), the anodal jack of test pencil (7), pin type test pencil (8), crocodile clip test pencil (9), data acquisition module (12), analog-to-digital conversion module (13), single-chip microcomputer (14), function selftest module (15), data disaply moudle (16) and voice broadcast module (17), described data acquisition module (12), analog-to-digital conversion module (13), single-chip microcomputer (14), function selftest module (15), data disaply moudle (16), voice broadcast module (17) is arranged on the inside of voltage table (1), data acquisition module (12), analog-to-digital conversion module (13), single-chip microcomputer (14) connects successively, the output terminal of single-chip microcomputer (14) respectively with function selftest module (15), data disaply moudle (16), voice broadcast module (17) is connected to each other, voltage table display screen (2), loudspeaker (3), self-inspection button (4), power switch (5), test pencil negative pole jack (6), the anodal jack of test pencil (7) is arranged on the outside surface of voltage table (1), voltage table display screen (2) is connected to each other with data disaply moudle (16), loudspeaker (3) are connected to each other with voice broadcast module (17), self-inspection button (4) is connected to each other with function selftest module (15), pin type test pencil (8) is connected to each other by the anodal jack of test pencil (7) and voltage table (1), and crocodile clip test pencil (9) is connected to each other by test pencil negative pole jack (6) and voltage table (1), described crocodile clip test pencil (9) comprises carp folder middle part (10) and crocodile clip oral area (11), and crocodile clip oral area (11) is provided with broached-tooth design.