CN218546874U - Insulation resistance tester based on high voltage generator restraines induced voltage - Google Patents
Insulation resistance tester based on high voltage generator restraines induced voltage Download PDFInfo
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- CN218546874U CN218546874U CN202222758098.XU CN202222758098U CN218546874U CN 218546874 U CN218546874 U CN 218546874U CN 202222758098 U CN202222758098 U CN 202222758098U CN 218546874 U CN218546874 U CN 218546874U
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Abstract
The utility model discloses an insulation resistance tester based on high voltage generator restraines induced voltage, its characterized in that: the high-voltage generation module is connected with the measurement module with the function of inhibiting induced voltage, the measurement module comprises a rheostat T1, a transformer T2, a capacitor C and a microammeter, the test voltage is connected to the primary side of the transformer T2 through the rheostat T1, the secondary side of the transformer T2 is connected with the capacitor C, the insulation resistor to be tested is connected with the microammeter in series, and the insulation resistor to be tested after series connection is connected with the microammeter in parallel with the capacitor C. The utility model discloses can restrain insulation resistance's induced voltage, guarantee that insulation test goes on safely.
Description
Technical Field
The utility model relates to an insulation resistance test field specifically is an insulation resistance tester based on high voltage generator restraines induced voltage.
Background
When testing the insulation resistance of transformer, motor, generator, cable, overhead line and tubular bus, the tested product has high induced electricity due to the parallel erection of transformer substation, power plant, cable or line, and the voltage can reach hundreds to thousands of volts, even tens of thousands of volts. At this moment, if a common insulation resistance meter is used for insulation resistance test, the instrument can be directly burnt due to overhigh induction voltage, and insulation resistance test cannot be carried out.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide an insulation resistance tester based on high voltage generator restraines induced voltage, restraines insulation resistance's induced voltage, guarantees that insulation test goes on safely.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides an insulation resistance tester based on high voltage generator restraines induced voltage which characterized in that: the high-voltage generation module is connected with a measurement module with an induced voltage suppression function, the measurement module comprises a rheostat T1, a transformer T2, a capacitor C and a microammeter, the test voltage is connected to the primary side of the transformer T2 through the rheostat T1, the secondary side of the transformer T2 is connected with the capacitor C, the insulation resistor to be tested is connected with the microammeter in series, and the insulation resistor to be tested after series connection is connected with the microammeter in parallel with the capacitor C.
Further, a diode D and a resistor R are connected between the capacitor C and the secondary side of the transformer T2, the cathode of the diode D is connected with the secondary side of the transformer T2, the anode of the diode D is connected with one end of the resistor R, and the other end of the resistor R is connected with the capacitor C.
Furthermore, a photoelectric isolation module is arranged between the input module and the master control system.
The utility model has the advantages that: the utility model discloses a high voltage generator restraines induced voltage, and the interference killing feature who adds the direct current high voltage test mainly depends on the direct current and reveals the proportion of electric current with exchanging, and both effective values differ more better, and when measuring insulating leakage current with direct current high pressure, compare with the megohmmeter and have following advantage:
the test voltage is high and can adjust the test voltage value wantonly, adds corresponding test voltage to the tested article of certain voltage class, can make the weak point of insulating itself show more easily, can monitor the instruction one of microampere table at any time and know insulating situation simultaneously in the process of stepping up: if the insulation is good, the leakage current should be proportional to the voltage; if the insulation is defective or damp, the leakage current increases faster than the voltage, and if the voltage is higher, the leakage current increases sharply, and there are some abnormal phenomena.
The measuring accuracy of the microammeter is higher than that of a megameter, and the leakage current and the direct current withstand voltage can be measured simultaneously.
Drawings
FIG. 1 is a schematic diagram of the present invention;
fig. 2 is a schematic diagram of a measurement circuit.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments.
Example 1
The embodiment discloses an insulation resistance tester based on induced voltage suppression of a high-voltage generator, which comprises an input module, a photoelectric isolation module, a main control module, a high-voltage generation module, a measurement module, a display unit and a voice prompt module, as shown in fig. 1. The input module is connected with the main control system through the photoelectric isolation module, the main control system is connected with the high-voltage generation module, the high-voltage generation module is connected with the measurement module, the measurement module is connected with the display unit, and the voice prompt module is connected between the main control system and the display unit.
As shown in fig. 2, the induced voltage suppression module adopts a high voltage generation method, specifically, the measurement module includes a varistor T1, a transformer T2, a capacitor C, and a microammeter, the test voltage is connected to the primary side of the transformer T2 through the varistor T1, the secondary side of the transformer T2 is connected to the capacitor C, the insulation resistance to be tested is connected in series with the microammeter, and the insulation resistance to be tested after the series connection is connected in parallel with the microammeter and the capacitor C. And a diode D and a resistor R are connected between the capacitor C and the secondary side of the transformer T2, the cathode of the diode D is connected with the secondary side of the transformer T2, the anode of the diode D is connected with one end of the resistor R, and the other end of the resistor R is connected with the capacitor C.
In this embodiment, U i In order to test the voltage, the test voltage value can be adjusted at will and transmitted to the insulation resistor to be tested through the transformer. Applying corresponding test voltage to the insulation resistance to be tested with a certain voltage grade to make it be insulatedThe weakness of the rim itself is more easily manifested.
In this embodiment, the microammeter is used to detect the insulation characteristic of the insulation resistor to be tested, and the indication of the microammeter can be monitored at any time during the boosting process to know the insulation condition: if the insulation is good, the leakage current should increase proportionally with the voltage; if the insulation is defective or damp, the leakage current increases faster than the voltage, and if the voltage is higher, the leakage current increases sharply, and there are some abnormal phenomena. The measuring precision of the microammeter is higher than that of a megameter, and the measurement of the leakage current and the direct-current withstand voltage can be carried out simultaneously.
In this embodiment, the optoelectronic isolation module adopts a photoelectric coupler for isolating the input module from the main control system and preventing high-voltage interference.
In order to display the test result and the voice prompt in real time, the embodiment is further provided with a display unit and a voice prompt module, the measurement module is connected with the display unit, and the voice prompt module is connected between the main control system and the display unit. The display unit adopts a large-screen digital/analog display screen, can automatically measure and memorize the R15S, R60S, R min value, and automatically display the test value and the test time of the Polarization Index (PI) and the absorption ratio (DAR).
The working process of the tester in this embodiment is as follows: after the main control system sends an instruction through the input module, the high-voltage generator is adjusted to output test voltage according to an input numerical value, the test voltage charges the capacitor C through the transformer T2, the insulation resistance to be tested is connected behind the capacitor C and rises along with the charging process of the capacitor C, the insulation resistance to be tested is connected with the microampere meter, and the insulation condition of the insulation resistance to be tested can be known by monitoring the indication of the microampere meter at any time in the boosting process.
The foregoing description is only for the basic principles and preferred embodiments of the present invention, and modifications and substitutions made by those skilled in the art according to the present invention belong to the protection scope of the present invention.
Claims (4)
1. The utility model provides an insulation resistance tester based on high voltage generator restraines induced voltage which characterized in that: the high-voltage generation module is connected with a measurement module with an induced voltage suppression function, the measurement module comprises a rheostat T1, a transformer T2, a capacitor C and a microammeter, the test voltage is connected to the primary side of the transformer T2 through the rheostat T1, the secondary side of the transformer T2 is connected with the capacitor C, the insulation resistor to be tested is connected with the microammeter in series, and the insulation resistor to be tested after series connection is connected with the microammeter in parallel with the capacitor C.
2. The insulation resistance tester based on the high voltage generator suppressed induction voltage according to claim 1, characterized in that: and a diode D and a resistor R are connected between the capacitor C and the secondary side of the transformer T2, the cathode of the diode D is connected with the secondary side of the transformer T2, the anode of the diode D is connected with one end of the resistor R, and the other end of the resistor R is connected with the capacitor C.
3. The insulation resistance tester based on the suppression induced voltage of the high voltage generator according to claim 1, characterized in that: and a photoelectric isolation module is arranged between the input module and the master control system.
4. The insulation resistance tester based on the suppression induced voltage of the high voltage generator according to claim 1, characterized in that: the measurement module is connected with the display unit, and the voice prompt module is connected between the main control system and the display unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222758098.XU CN218546874U (en) | 2022-10-20 | 2022-10-20 | Insulation resistance tester based on high voltage generator restraines induced voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222758098.XU CN218546874U (en) | 2022-10-20 | 2022-10-20 | Insulation resistance tester based on high voltage generator restraines induced voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218546874U true CN218546874U (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222758098.XU Active CN218546874U (en) | 2022-10-20 | 2022-10-20 | Insulation resistance tester based on high voltage generator restraines induced voltage |
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| CN (1) | CN218546874U (en) |
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2022
- 2022-10-20 CN CN202222758098.XU patent/CN218546874U/en active Active
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