CN218546873U - Insulation resistance tester based on capacitance partial pressure restraines induced voltage - Google Patents
Insulation resistance tester based on capacitance partial pressure restraines induced voltage Download PDFInfo
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- CN218546873U CN218546873U CN202222758096.0U CN202222758096U CN218546873U CN 218546873 U CN218546873 U CN 218546873U CN 202222758096 U CN202222758096 U CN 202222758096U CN 218546873 U CN218546873 U CN 218546873U
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Abstract
The utility model discloses an insulation resistance tester based on electric capacity partial pressure restraines induced voltage, including switch constant voltage power supply, induced voltage suppression circuit, bleeder circuit, analog signal gathers and converting circuit, the master control unit, switch constant voltage power supply includes reference voltage and switch constant voltage power supply circuit, reference voltage is connected to induced voltage suppression circuit through switch constant voltage power supply circuit, induced voltage suppression circuit includes circuit coupling electric capacity and circuit capacitor to ground, circuit coupling electric capacity is connected between operation circuit and the circuit under test, the circuit capacitor to ground is connected between circuit under test and ground, the circuit capacitor to ground is parallelly connected to have bleeder capacitor, bleeder circuit is connected to induced voltage suppression circuit's output, bleeder circuit is connected to the master control unit through analog signal gathers and converting circuit. The utility model discloses can effectively reduce the induced voltage on the tested article, guarantee that the high-pressure megohmmeter accomplishes the test work of tested article insulation resistance characteristic.
Description
Technical Field
The utility model relates to an insulation resistance test field specifically is an insulation resistance tester based on electric capacity partial pressure restraines induced voltage.
Background
When testing the insulation resistance of a transformer, a motor, a generator, a cable, an overhead line and a tubular bus, the tested product has very high induced electricity due to the parallel erection of a transformer substation, a power plant, a cable or a line and the like, and the voltage can reach hundreds of kilovolts to thousands of kilovolts or even tens of thousands of volts. At this moment, if a common megohmmeter is used for carrying out insulation resistance test, the instrument can be directly burnt out due to overhigh induction voltage, insulation resistance test cannot be carried out, and the risk of electric shock injury caused by testers also exists.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide an insulation resistance tester based on electric capacity partial pressure restraines induced voltage, to alternating current induced voltage on the tested article to forming alternating current low resistance discharge channel, to direct current isolation completely, effectively reduces the induced voltage on the tested article, guarantees that high-pressure megohmmeter accomplishes the test work of tested article insulation resistance characteristic.
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 electric capacity partial pressure restraines induced voltage, including switching regulator power supply, induced voltage suppression circuit, bleeder circuit, analog signal gathers and converting circuit, the main control unit, switching regulator power supply includes reference voltage and switching regulator power supply circuit, reference voltage is connected to induced voltage suppression circuit through switching regulator power supply circuit, induced voltage suppression circuit includes circuit coupling capacitance and circuit to ground capacitance, circuit coupling capacitance connects between operation circuit and circuit under test, circuit to ground capacitance connects between circuit under test and ground, circuit to ground capacitance parallel connection has bleeder capacitor, bleeder circuit is connected to induced voltage suppression circuit's output, bleeder circuit is connected to the main control unit through analog signal collection and converting circuit.
Furthermore, the voltage division circuit comprises a tested resistor Rx, an operational amplifier U1 and a plurality of adjusting resistors, wherein the tested resistor Rx is connected to the inverting input end of the operational amplifier U1, the inverting input end of the operational amplifier U1 is connected with an input voltage, the non-inverting input end of the operational amplifier U1 is grounded, the adjusting resistors are connected between the inverting input end and the output end of the operational amplifier U1 in parallel, each adjusting resistor is connected with a switching switch in series, and the tested resistor Rx and each adjusting resistor form a negative feedback amplification circuit.
Furthermore, the analog signal acquisition and conversion circuit comprises a signal acquisition circuit and an A/D converter, the signal acquisition circuit is connected with the output end of the voltage division circuit, and the signal acquisition circuit is connected to the main control unit through the A/D converter.
Furthermore, the main control unit is connected with a liquid crystal display screen and a keyboard.
The utility model has the advantages that: the utility model discloses an inhibit induced voltage with the capacitive voltage-sharing method, parallelly connected electric capacity can attenuate by a wide margin because the power frequency induced voltage that capacitive coupling produced for tester and test equipment's safe risk greatly reduced has solved because induced voltage is too high and can not carry out the difficult problem that insulation resistance measured with the insulation resistance meter. The induction voltage suppression circuit forms an alternating current low-resistance discharge channel for alternating current induction voltage on the tested object under the condition of the alternating current voltage of 20kV, direct current is completely isolated, the induction voltage on the tested object is effectively reduced, and the high-voltage megohmmeter is ensured to complete the test work of the insulation resistance characteristic of the tested object.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a schematic diagram of the capacitor voltage division suppressing the induced voltage;
fig. 3 is a schematic diagram of a voltage divider 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 electric capacity partial pressure restraines induced voltage, as shown in fig. 1, including switching regulator power supply, induced voltage suppression circuit, bleeder circuit, analog signal gathers and converting circuit, the master control unit, switching regulator power supply includes reference voltage and switching regulator power supply circuit, reference voltage is connected to induced voltage suppression circuit through switching regulator power supply circuit, induced voltage suppression circuit includes line coupling capacitance and line to ground capacitance, line coupling capacitance connects between operation line and the circuit under test, line to ground capacitance connects between circuit under test and ground, line to ground capacitance is parallelly connected with bleeder capacitor, bleeder circuit is connected to induced voltage suppression circuit's output, bleeder circuit is connected to the master control unit through analog signal gathers and converting circuit. The main control unit is connected with a liquid crystal display screen and a keyboard.
The induced voltage suppression circuit of the embodiment adopts a parallel capacitance method, as shown in fig. 2, the upper three lines are live operation lines, the lower three lines are detected power failure lines, and a coupling capacitor C exists between the two lines due to the fact that the live operation lines and the power failure detected lines are in the same tower and are in parallel or parallel AA 、C AB 、C AC ，C AA For the capacitance between live A phase and dead line, C AB Capacitance between live B phase and dead line, C AC The capacitor is a capacitor between the live C phase and the power failure line. Taking phase A of power failure as an example, the coupling capacitance generated by a 100 kilometer live line and the phase A power failure line does not exceed 0.2uf, phase A has a ground capacitance C AG If a capacitance C is applied 0 And ensure C 0 Has a capacity value of 2uf, C 0 And C AG The capacitance value after parallel connection is larger than 2uf, so that due to the voltage division effect of the capacitor, when the induced voltage generated by the tested product is 20kV, the A phase can divide the induced voltage to 2000V after being connected into the suppressor, and the induced voltage is reduced.
As shown in fig. 3, the voltage divider circuit includes a resistor Rx to be measured, an operational amplifier U1, and a plurality of adjusting resistors, wherein the resistor Rx to be measured is connected to the inverting input terminal of the operational amplifier U1, the inverting input terminal of the operational amplifier U1 is connected to the input voltage, the non-inverting input terminal of the operational amplifier U1 is connected to the ground, the adjusting resistors are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U1, and each adjusting resistor is connected in series with a switch hook, and the resistor Rx to be measured and each adjusting resistor form a negative feedback amplifier circuit. The analog signal acquisition and conversion circuit comprises a signal acquisition circuit and an A/D converter, the signal acquisition circuit is connected with the output end of the voltage division circuit, and the signal acquisition circuit is connected to the main control unit through the A/D converter.
The voltage division circuit is based on the virtual short of the input end of the operational amplifier U1，V + =V - =0; according to the virtual interruption of the operational amplifier U1, flows through R x Is equal to the current flowing through the precision standard resistor. If the switch SW0 is closed, the voltage V is sampled out Has a value of V out =V in *R 0 /R x When sampling the voltage V out When smaller, the resistance of the regulating resistor can be increased, and the sampling voltage V is similar to the resistance out When the voltage is larger, the resistance value can be reduced, the change of the resistance value is realized by switching on and off the selector switch, and the sampling voltage is ensured to meet the voltage range of 15mV to 2V.
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 the input numerical value, the voltage and current variables are sampled and recorded through the resistance measuring module, the test numerical value is displayed on the display module in real time, and the induced voltage suppression module reduces the induced voltage applied to the insulation resistance tester to the range which can be borne by the instrument below 1000V by adopting a parallel capacitance method. Therefore, the insulation resistance of the tested object can be tested, the discharging module is connected after the test is finished, the display module can display the discharging voltage value in real time, and the voice module can prompt the discharging result.
The embodiment matches the induced voltage suppression circuit with the insulation resistance tester, and when the insulation resistance test is performed on a test article with higher induced voltage, the induced voltage suppression circuit is connected between the output terminal of the high-voltage megohmmeter and the ground in parallel, so that the induced voltage suppressor is ensured to form an alternating current low-resistance discharge channel on the alternating current induced voltage of the test article under the condition of the alternating current voltage of 20kV, the direct current is completely isolated, the induced voltage on the test article is effectively reduced, and the high-voltage megohmmeter is ensured to complete the test work of the insulation resistance characteristic of the test article.
The foregoing description is only for the basic principle and the preferred embodiments of the present invention, and the modifications and replacements 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 electric capacity partial pressure restraines induced voltage which characterized in that: including switching regulated power supply, induced voltage suppression circuit, bleeder circuit, analog signal gathers and converting circuit, the main control unit, switching regulated power supply includes reference voltage and switching regulated power supply circuit, reference voltage is connected to induced voltage suppression circuit through switching regulated power supply circuit, induced voltage suppression circuit includes line coupling electric capacity and line capacitance to ground, line coupling electric capacity is connected between operation circuit and circuit under test, the line capacitance to ground is connected between circuit under test and ground, the line capacitance to ground is parallelly connected with bleeder capacitor, bleeder circuit is connected to induced voltage suppression circuit's output, bleeder circuit is connected to the main control unit through analog signal collection and converting circuit.
2. The insulation resistance tester based on the capacitance voltage division suppression induced voltage according to claim 1, characterized in that: the voltage division circuit comprises a detected resistor Rx, an operational amplifier U1 and a plurality of adjusting resistors, wherein the detected resistor Rx is connected to the inverting input end of the operational amplifier U1, the inverting input end of the operational amplifier U1 is connected with input voltage, the non-inverting input end of the operational amplifier U1 is grounded, the adjusting resistors are connected between the inverting input end and the output end of the operational amplifier U1 in parallel, each adjusting resistor is connected with a switching switch in series, and the detected resistor Rx and each adjusting resistor form a negative feedback amplification circuit.
3. The insulation resistance tester based on the capacitive voltage division suppression induced voltage of claim 2, characterized in that: the analog signal acquisition and conversion circuit comprises a signal acquisition circuit and an A/D converter, the signal acquisition circuit is connected with the output end of the voltage division circuit, and the signal acquisition circuit is connected to the main control unit through the A/D converter.
4. The insulation resistance tester based on the capacitance voltage division suppression induced voltage of claim 1, characterized in that: the main control unit is connected with a liquid crystal display screen and a keyboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222758096.0U CN218546873U (en) | 2022-10-20 | 2022-10-20 | Insulation resistance tester based on capacitance partial pressure restraines induced voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222758096.0U CN218546873U (en) | 2022-10-20 | 2022-10-20 | Insulation resistance tester based on capacitance partial pressure restraines induced voltage |
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| CN218546873U true CN218546873U (en) | 2023-02-28 |
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| CN202222758096.0U Active CN218546873U (en) | 2022-10-20 | 2022-10-20 | Insulation resistance tester based on capacitance partial pressure restraines induced voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117471175A (en) * | 2023-10-30 | 2024-01-30 | 国网四川省电力公司超高压分公司 | Method and device for reducing induced voltage |
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2022
- 2022-10-20 CN CN202222758096.0U patent/CN218546873U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117471175A (en) * | 2023-10-30 | 2024-01-30 | 国网四川省电力公司超高压分公司 | Method and device for reducing induced voltage |
| CN117471175B (en) * | 2023-10-30 | 2024-06-11 | 国网四川省电力公司超高压分公司 | Method and device for reducing induced voltage |
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