CN216160802U - Remote electric leakage test device with voltage doubling circuit - Google Patents
Remote electric leakage test device with voltage doubling circuit Download PDFInfo
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- CN216160802U CN216160802U CN202122029591.3U CN202122029591U CN216160802U CN 216160802 U CN216160802 U CN 216160802U CN 202122029591 U CN202122029591 U CN 202122029591U CN 216160802 U CN216160802 U CN 216160802U
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Abstract
The utility model provides a remote electric leakage test device with a voltage doubling circuit, which comprises: the voltage doubling circuit provides at least two power supplies with different voltage values for the leakage test circuit; one end of each of the leakage test circuits is connected to the load side of the switch to be tested, and the other end of each of the leakage test circuits is connected with the grounding terminal; a selection switch provided between the voltage doubler circuit and the leakage test circuit, for selectively turning on one of the leakage test circuits; and the state switching switch is arranged between the output end of the voltage doubling circuit and the selection switch and between the leakage test circuit and the grounding terminal. The remote electric leakage test device with the voltage doubling circuit is suitable for different electric leakage test resistors, is provided with the voltage doubling circuit, the selection switch for determining connection of one of the voltage doubling circuit and the selection switch, and is also provided with the state change-over switch, so that electric shock accidents caused by voltage existing at a clamp can be avoided.
Description
Technical Field
The utility model belongs to the field of coal mine electric power, and particularly relates to a remote electric leakage test device with a voltage doubling circuit.
Background
The method is characterized in that a remote manual leakage test tripping test is performed on the leakage detection protection device in operation at least once per month according to the requirements of the installation, operation, maintenance and overhaul rules of the underground low-voltage leakage detection protection device of the coal mine.
Test methods and requirements: test resistance: test resistors are connected according to different voltage levels (2 k omega and 10w resistors are used for 127v, 11k omega and 10w resistors are used for 660v, and 20k omega and 10w resistors are used for 1140 v); testing the resistance access position: the load side of the wiring cavity of the magnetic starter at the farthest point of the power supply line and the grounding bolt. ③ test objects: a feed switch with selective leakage protection function, lighting integrated protection, etc. Fourthly, the test method: the method comprises the steps of firstly opening a test switch, then removing an electric leakage locking loop in a magnetic starter at the farthest point, connecting one side of a test resistor to a wiring column at the side of a load in a wiring cavity of the magnetic starter, connecting one side of the test resistor to a grounding bolt, and recovering power supply of the test switch after completion.
As shown in fig. 1, the switch a is a feed switch with an earth leakage protection device, and the quality of the earth leakage protection device of the switch a is tested according to the regulation of 'distant earth leakage operation test' every month; the switch B is the switch (magnetic starter) at the farthest end of the power supply line. The test method comprises the following steps: under the switching-off power-off state of the switch A, a lead is connected in series with the test resistor, one side of the lead is connected with the load side (any binding post of U, V, W) of the switch B, and the other side of the lead is connected with the grounding bolt of the switch B. At the moment, the switch A is switched on, power supply is recovered, then the switch B is switched on, if the switch A trips and leakage faults are displayed, the leakage protection device serving as the master control switch A is normal in function, and the reverse leakage protection device is abnormal in function and needs to be replaced.
At present, a plurality of coal mines are automatically and simply assembled according to the pictures through research and research, and then are applied to practical tests, but two faults, namely open circuit or short circuit, generally exist in a resistor.
If the resistor in the product is broken, the resistance of the product is infinite, and the resistance is difficult to find by artificial observation, when the leakage test is carried out under the condition, the protection action can not occur even if the leakage protection device is normal, an error conclusion that the protection device is abnormal can be obtained, and the error can bring great misleading to the test.
If the resistance in the product is in short circuit, the resistance of the product is infinitely close to zero, an electric leakage test is carried out under the condition that the resistance cannot be found by naked eyes, at the moment, if the electric leakage protection device has a fault, the electric leakage tripping cannot be realized, a large electric leakage current can be generated at the test point of the magnetic starter, great potential safety hazards exist in a gas accumulation place, and the electric leakage protection device is absolutely not allowed in a high gas mine.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to provide a remote leakage test device having a voltage doubler circuit and providing at least the advantages described hereinafter.
The utility model also aims to provide a remote electric leakage test device with a voltage doubling circuit, which is suitable for different electric leakage test resistors, is provided with the voltage doubling circuit, a selection switch for determining connection of one of the voltage doubling circuit and the selection switch, and is also provided with a state change-over switch, so that electric shock accidents caused by voltage existing at a clamp can be avoided.
The technical scheme of the utility model is as follows: a remote leakage test device having a voltage doubler circuit, comprising: the voltage doubling circuit provides at least two power supplies with different voltage values for the leakage test circuit; one end of each of the leakage test circuits is connected to the load side of the switch to be tested, and the other end of each of the leakage test circuits is connected with the grounding terminal; a selection switch provided between the voltage doubler circuit and the leakage test circuit, for selectively turning on one of the leakage test circuits; and the state switching switch is arranged between the output end of the voltage doubling circuit and the selection switch and between the leakage test circuit and the grounding terminal.
Preferably, the remote leakage testing device with the voltage doubling circuit further comprises a light emitting diode, which is arranged between the input end of the voltage doubling circuit and the output end of the leakage testing circuit.
Preferably, in the remote leakage testing device with the voltage doubling circuit, the voltage doubling circuit comprises a direct-current constant-voltage power supply, a time-base circuit and a boosting module; the time-base circuit is an NE555 chip; the direct-current constant-voltage power supply is 5V; the voltage doubling circuit provides power supplies with three different voltage values of 5V, 25V and 50V.
Preferably, in the remote electric leakage test apparatus having the voltage doubling circuit, the electric leakage test circuit includes: the first leakage test circuit is provided with a 2K omega resistor and is provided with a power supply with voltage of 5V by the voltage doubling circuit; the second leakage test circuit is provided with an 11K omega resistor and is provided with a power supply with voltage of 25V by the voltage doubling circuit; and the third leakage test circuit is provided with a 22K omega resistor and is provided with a power supply with the voltage of 50V by the voltage doubling circuit.
Preferably, in the remote leakage testing device with the voltage doubling circuit, 2 light emitting diodes are arranged in parallel.
The utility model has the following beneficial effects: the state change-over switch is arranged, so that electric shock accidents caused by voltage at the clamp can be avoided; a voltage doubling circuit and a selection switch are arranged to determine to switch on one of the leakage test circuits and provide different voltage values; the light-emitting diode is arranged, so that the connection, disconnection or short circuit of the electric leakage test resistor can be visually observed, and the safety and reliability of the test are greatly improved. Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.
Drawings
FIG. 1 is a schematic diagram of a remote leakage test;
fig. 2 is a circuit diagram of an embodiment of the remote leakage testing device with the voltage doubling circuit provided by the utility model.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the utility model by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
The present invention needs to overcome the following difficulties: 1) how to carry out preliminary detection on the intact condition of the test resistor before the test; 2) the voltage doubling circuit is skillfully utilized, the test resistors in different voltage states are integrated on the same circuit board, and the device is integrated and simplified, so that an operator can carry and use the device conveniently; 3) the misleading situation during the test is avoided, and the safety and reliability are practically improved.
As shown in fig. 2, the present invention provides a remote leakage test device having a voltage doubler circuit, comprising: the voltage doubling circuit provides at least two power supplies with different voltage values for the leakage test circuit; one end of each of the leakage test circuits is connected to the load side of the switch to be tested, and the other end of each of the leakage test circuits is connected with the grounding terminal; selection switches K1, K2, and K3 provided between the voltage doubler circuit and the leakage test circuit to selectively turn on one of the leakage test circuits; and a state switching switch QK arranged between the output end of the voltage doubling circuit and the selection switch and between the leakage test circuit and the grounding terminal.
In an embodiment of the remote leakage testing device with the voltage doubling circuit, the device further comprises a light emitting diode, and the light emitting diode is arranged between the input end of the voltage doubling circuit and the output end of the leakage testing circuit.
In one embodiment of the remote electric leakage test device with the voltage doubling circuit provided by the utility model, the voltage doubling circuit comprises a direct-current constant-voltage power supply, a time-base circuit and a boosting module A; the time-base circuit is an NE555 chip; the direct current constant voltage power supply is 5V; the voltage doubling circuit provides power supplies with three different voltage values of 5V, 25V and 50V. The NE555 chip is used for manufacturing a voltage-doubling integrated circuit, and is a common means for those skilled in the art, so that a detailed description is not needed here, and those skilled in the art can select the voltage-doubling integrated circuit according to actual needs.
In one embodiment of the present invention, the remote leakage testing device with voltage doubling circuit comprises: the first leakage test circuit is provided with a 2K omega resistor R1, and the voltage doubling circuit provides a power supply with voltage of 5V for the first leakage test circuit; the second leakage test circuit is provided with an 11K omega resistor R2, and the voltage doubling circuit provides a power supply with voltage of 25V for the second leakage test circuit; and the third leakage test circuit is provided with a 22K omega resistor R3, and the voltage doubling circuit provides a power supply with voltage of 50V for the third leakage test circuit.
In one embodiment of the remote leakage testing device with the voltage doubling circuit provided by the utility model, 2 light emitting diodes are arranged in parallel. Firstly, selecting a patch type low-current light-emitting diode, and judging the on-off condition of a circuit by the light emission of the diode; the working current of the low-current LED is below 2mA, so that the self luminescence can be realized; A5V direct current constant voltage source is selected on the V + + side, 5V transient direct current voltage can be output on the V + + side, 25V transient direct current voltage is output on the 5V + + side, and 50V transient direct current voltage is output on the 10V + + side through a voltage doubling integrated circuit.
The device has two working modes, namely a test mode and a working mode. The principle is as follows: when the test/working button is selected to be in a test state, the resistance condition is pre-detected, and the normally closed point of the button is disconnected, so that the voltage existing at the clamp is prevented from causing electric shock accidents; on the other hand, the button can be selected to three gears, namely V + +, 5V + +, 10V + +, which correspond to 2K Ω, 11K Ω, and 22K Ω, respectively, through the toggle button. According to the principle of a circuit diagram, the condition of completeness of the resistor can be reflected through the states of the surface-mounted light-emitting diode no matter which gear is selected, and when the diode emits light and the brightness of the three states is basically consistent, the tested resistor can be judged to be completeness; if both the two diodes are not bright, the circuit resistance is open circuit; if two diodes are damaged at the moment of electrifying, the circuit resistance is short-circuited. In conclusion, under the condition that the resistance is determined to be intact, the device can be used for the underground remote electric leakage test, and the principle is as follows: dial test/operating button to operating condition from experimental condition, the normally closed point of disconnection will be closed this moment, can realize through dial-up button under the different voltage levels, the selection of different resistance resistor participates in the electric leakage test, will greatly improve experimental security, reliability through this device.
The remote electric leakage test device with the voltage doubling circuit provided by the utility model performs pre-detection on the intact condition of the remote electric leakage resistor, and can visually judge whether the resistor has short circuit or open circuit faults or not through the brightness of the light emitting diode; meanwhile, at present, the power integration technology is mature day by day, a multi-voltage integrated direct-current circuit is ingeniously utilized, and detection of resistors with different resistance values can be realized on an extremely small device through simple selection of a dial button. Although the resistance values of the test resistors are different for different voltage levels, the voltage-multiplying integrated circuit can provide power supplies with different voltage levels to make the light emission of the diodes basically consistent.
Although the 'remote electric leakage test' is required in the 'three protection implementation rules' of coal mines, since no regular product exists in the market, many coal mine electromechanical units deal with the higher level inspection, the data counterfeiting phenomenon exists, or self-processing and modified equipment is used for the electric leakage test, the test error exists, meanwhile, the potential safety hazard is also great, and the action of facing a high gas mine is a great challenge to the safety. The remote electric leakage test device with the voltage doubling circuit is simple in structure, low in price and convenient to manufacture, utilizes an electronic forming board to skillfully avoid large investment, is convenient to carry and simple in principle, improves reliability of remote electric leakage test, and avoids great hidden danger brought to safety by large current during test.
While embodiments of the utility model have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the utility model pertains, and further modifications may readily be made by those skilled in the art, it being understood that the utility model is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (5)
1. A remote leakage test device with a voltage doubling circuit, comprising:
the voltage doubling circuit provides at least two power supplies with different voltage values for the leakage test circuit;
one end of each of the leakage test circuits is connected to the load side of the switch to be tested, and the other end of each of the leakage test circuits is connected with the grounding terminal;
a selection switch provided between the voltage doubler circuit and the leakage test circuit, for selectively turning on one of the leakage test circuits;
and the state switching switch is arranged between the output end of the voltage doubling circuit and the selection switch and between the leakage test circuit and the grounding terminal.
2. The remote leakage test apparatus having a voltage doubling circuit as claimed in claim 1, further comprising a light emitting diode disposed between said voltage doubling circuit input and said leakage test circuit output.
3. The remote leakage test apparatus having a voltage doubling circuit according to claim 2,
the voltage doubling circuit comprises a direct-current constant-voltage power supply, a time-base circuit and a boosting module;
the time-base circuit is an NE555 chip;
the direct-current constant-voltage power supply is 5V;
the voltage doubling circuit provides power supplies with three different voltage values of 5V, 25V and 50V.
4. A remote leakage test device having a voltage doubling circuit as in claim 3, wherein said leakage test circuit comprises:
the first leakage test circuit is provided with a 2K omega resistor and is provided with a power supply with voltage of 5V by the voltage doubling circuit;
the second leakage test circuit is provided with an 11K omega resistor and is provided with a power supply with voltage of 25V by the voltage doubling circuit;
and the third leakage test circuit is provided with a 22K omega resistor and is provided with a power supply with the voltage of 50V by the voltage doubling circuit.
5. The remote leakage test apparatus having a voltage doubling circuit as claimed in claim 4, wherein said light emitting diodes are arranged in 2 parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122029591.3U CN216160802U (en) | 2021-08-26 | 2021-08-26 | Remote electric leakage test device with voltage doubling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122029591.3U CN216160802U (en) | 2021-08-26 | 2021-08-26 | Remote electric leakage test device with voltage doubling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216160802U true CN216160802U (en) | 2022-04-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122029591.3U Expired - Fee Related CN216160802U (en) | 2021-08-26 | 2021-08-26 | Remote electric leakage test device with voltage doubling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216160802U (en) |
-
2021
- 2021-08-26 CN CN202122029591.3U patent/CN216160802U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220401 |