CN211236110U - Novel insulating oil withstand voltage tester - Google Patents
Novel insulating oil withstand voltage tester Download PDFInfo
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- CN211236110U CN211236110U CN201922086838.8U CN201922086838U CN211236110U CN 211236110 U CN211236110 U CN 211236110U CN 201922086838 U CN201922086838 U CN 201922086838U CN 211236110 U CN211236110 U CN 211236110U
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Abstract
The utility model discloses a novel insulating oil withstand voltage tester, which comprises an electric voltage regulating circuit, a step-up transformer, a high-voltage detection circuit, an AD converter and a processor which are connected in sequence, and also comprises a low-voltage current detection circuit and a high-voltage discharge pulse detection module; the input end of the low-voltage current detection circuit is connected with the output end of the electric voltage regulation circuit, and the output end of the low-voltage current detection circuit is connected with the AD converter; the input end of the high-voltage discharge pulse detection module is connected with the high-voltage side winding of the boosting transformer through an isolation induction transformer, and the output end of the high-voltage discharge pulse detection module is connected with the input end of the processor. The utility model relates to a detector, which simultaneously utilizes a low-voltage current detection circuit and a high-voltage discharge pulse detection module to carry out discharge detection, so that the detection result is more accurate; the delay reset of the processor accurately avoids the influence of high-voltage discharge on the circuit, and ensures the working reliability of the tester.
Description
Technical Field
The utility model relates to a detector, more specifically say, it relates to a novel insulating oil withstand voltage tester.
Background
The insulating oil voltage-withstanding tester is used for measuring the breakdown voltage of an insulating oil medium, and is one of the most widely applied insulating property detecting instruments in an electric power system. The working principle of the insulating oil voltage resistance tester is that alternating current high voltage with the phase difference of 180 degrees is applied to electrodes on two sides of an insulating oil testing oil cup, the voltage is continuously boosted until a sample in the oil cup breaks down and discharges, and the discharge voltage value is used as the breakdown voltage value.
The current technology has the following problems: the first is that the existing insulating oil withstand voltage tester adopts two AC high-voltage transformers to generate high voltage and records the AC effective value of the low-voltage side of the transformer or the instrument terminal as the final breakdown voltage, and the measured and displayed index only contains the environment condition when the instrument outputs the test high voltage without much information to indicate oil measurement. Secondly, in order to avoid destructive influence on the instrument caused by strong interference of primary discharge, the existing insulating oil voltage resistance tester generally adopts a mode of secondary overcurrent of a transformer to detect whether breakdown discharge occurs to a sample in an insulating oil testing oil cup. In the design, when the discharge spark of the tested oil sample is small, the secondary current cannot reach the set breakdown discharge current threshold value, the discharge voltage is mistakenly ignored and continuously boosted, and a higher discharge voltage value is reached, so that an error measurement result is obtained. Thirdly, the existing insulating oil tester detects the actual discharge voltage value based on an effective value, so that when the waveform distortion rate of the grid voltage is high, the waveform distortion can also cause the insulating oil withstand voltage tester to give an incorrect breakdown voltage reading.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is not enough to the above-mentioned of prior art, provides a novel insulating oil withstand voltage tester, comes to carry out withstand voltage detection to insulating oil, guarantees that the testing result is accurate and reliable.
The technical scheme of the utility model is like this: a novel insulating oil withstand voltage tester comprises an electric voltage regulating circuit, a step-up transformer, a high-voltage detection circuit, an AD converter and a processor which are sequentially connected, and further comprises a low-voltage current detection circuit and a high-voltage discharge pulse detection module; the input end of the low-voltage current detection circuit is connected with the output end of the electric voltage regulation circuit, and the output end of the low-voltage current detection circuit is connected with the AD converter; the input end of the high-voltage discharge pulse detection module is connected with the high-voltage side winding of the boosting transformer through an isolation induction transformer, and the output end of the high-voltage discharge pulse detection module is connected with the input end of the processor.
Furthermore, the high-voltage discharge pulse detection module comprises a pulse adjusting circuit, a delay trigger circuit and a reset circuit; the input end of the pulse adjusting circuit is connected with the low-voltage side winding of the isolation induction transformer, and the output end of the pulse adjusting circuit is connected with the input end of the delay triggering circuit; the output end of the delay trigger circuit is connected with the input end of the reset circuit; and the output end of the reset circuit is connected with the input end of the processor.
Furthermore, the pulse adjusting circuit comprises a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first diode, a second diode and a diode array; the first input end of the first operational amplifier is connected with the inductor through a first resistor, and the second input end of the first operational amplifier is connected with the output end through a second resistor and a third resistor respectively; the first input end of the second operational amplifier is connected with the output end of the first operational amplifier, the second input end of the second operational amplifier is connected with the output end, and the output end of the second operational amplifier is connected with the input end of the delay trigger circuit through a fourth resistor; after the first diode and the second diode are reversely connected in parallel, one end of the first diode is grounded, and the other end of the first diode is connected with the first input end of the first operational amplifier; and after the diode array is connected with the fifth resistor in parallel, one end of the cathode is grounded, and the other end of the diode array is connected with the input end of the delay trigger circuit.
Furthermore, the electric voltage regulating circuit comprises a power supply relay, an electric voltage regulator and a current limiting resistor; the input end of the voltage relay is connected with a power supply, and the output end of the voltage relay is connected with an input winding of the electric voltage regulator; the output winding of the electric voltage regulator is connected with a current-limiting resistor in series and is connected with the low-voltage side winding of the step-up transformer.
Furthermore, the low-voltage current detection circuit takes a current transformer as an input end and is in induction connection with an output winding of the electric voltage regulator; the output end of the low-voltage current detection circuit is connected with the input end of the AD converter.
Furthermore, the number of the step-up transformers is two, low-voltage side windings of the two step-up transformers are connected with an output winding of the electric voltage regulator through a current-limiting resistor, and the connection polarities are opposite; one end of a high-voltage side winding of each of the two step-up transformers is connected with an electrode of the test oil cup, and the other end of the high-voltage side winding of each of the two step-up transformers is grounded; and the metering windings of the two step-up transformers are respectively connected with the input end of the high-voltage detection circuit.
Compared with the prior art, the utility model, have following advantage:
1. the utility model discloses a novel insulating oil withstand voltage tester utilizes low-voltage current detection circuit and high-voltage discharge pulse detection module to come the detection that discharges simultaneously, makes the testing result more accurate.
2. The utility model discloses a novel insulating oil withstand voltage tester utilizes high-pressure discharge pulse detection module to make the treater time delay reset accuracy avoid the high-pressure discharge to the influence of circuit, guarantees the reliability of tester work.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a block diagram of a high voltage discharge pulse detection module;
wherein: OP 1-first operational amplifier, OP 2-second operational amplifier, R1-first resistor, R2-second resistor, R3-third resistor, R4-fourth resistor, R5-fifth resistor, D1-first diode, D2-second diode, DA-diode array.
Detailed Description
The invention will be further described with reference to specific embodiments shown in the drawings.
Referring to the attached drawings 1-2, the utility model discloses a novel insulating oil withstand voltage tester, including consecutive electronic regulator circuit, step up transformer, high voltage detection circuitry, AD converter and treater, still include low-voltage current detection circuitry and high-pressure discharge pulse detection module. The input end of the low-voltage current detection circuit is connected with the output end of the electric voltage regulation circuit, and the output end of the low-voltage current detection circuit is connected with the AD converter; the input end of the high-voltage discharge pulse detection module is connected with the high-voltage side winding of the boosting transformer through an isolation induction transformer, and the output end of the high-voltage discharge pulse detection module is connected with the input end of the processor. Meanwhile, the discharge detection is carried out by utilizing the low-voltage current detection circuit and the high-voltage discharge pulse detection module, so that the detection result is more accurate.
Preferably, the high-voltage discharge pulse detection module comprises a pulse adjusting circuit, a delay trigger circuit and a reset circuit. The input end of the pulse adjusting circuit is connected with the low-voltage side winding of the isolation induction transformer, and the output end of the pulse adjusting circuit is connected with the input end of the delay triggering circuit; the output end of the delay trigger circuit is connected with the input end of the reset circuit; the output end of the reset circuit is connected with the input end of the processor.
Preferably, the pulse adjusting circuit includes a first operational amplifier OP1, a second operational amplifier OP2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first diode D1, a second diode D2, and a diode array DA. The first operational amplifier OP1 has a first input terminal connected to the inductor through a first resistor R1, a second input terminal connected to ground through a second resistor R2, and a third resistor R3 connected to the output terminal. The first input end of the second operational amplifier OP2 is connected to the output end of the first operational amplifier OP1, the second input end is connected to the output end, and the output end is connected to the input end of the delay trigger circuit through a fourth resistor R4. After being connected in parallel in the reverse direction, the first diode D1 and the second diode D2 have one end grounded and the other end connected to the first input terminal of the first operational amplifier OP 1. After the diode array DA is connected with the fifth resistor R5 in parallel, one end of the cathode is grounded, and the other end of the cathode is connected with the input end of the delay trigger circuit.
Preferably, the electric voltage regulating circuit comprises a power supply relay, an electric voltage regulator and a current limiting resistor. The input end of the voltage relay is connected with a power supply, and the output end of the voltage relay is connected with an input winding of the electric voltage regulator; the output winding of the electric voltage regulator is connected with a current-limiting resistor in series and is connected with the low-voltage side winding of the step-up transformer. The electric voltage regulating circuit regulates the voltage and supplies power to the whole circuit according to the requirement.
Preferably, the low-voltage current detection circuit is in inductive connection with an output winding of the electric voltage regulator by taking a current transformer as an input end. The current output by the electric voltage regulator is converted into low current, then converted into voltage signals through level conversion, and then output to the AD converter for high-speed sampling. And after sampling, the processor is used for processing, and when the processor detects that the instantaneous current value exceeds a set maximum allowable value, the input power supply of the voltage regulator is immediately cut off so as to cut off high-voltage output.
Preferably, the number of the step-up transformers is two, low-voltage side windings of the two step-up transformers are connected with an output winding of the electric voltage regulator through a current-limiting resistor, and the connection polarities are opposite, so that the voltage phase difference between two poles of the test oil cup is 180 degrees. One end of a high-voltage side winding of each of the two step-up transformers is connected with the electrode of the test oil cup, and the other end of the high-voltage side winding is grounded. And the metering windings of the two step-up transformers are respectively connected with the input end of the high-voltage detection circuit to measure the high-voltage.
The working principle of the novel insulating oil pressure resistance tester is as follows:
when the tester works, 220V alternating current is supplied to the step-up transformer after passing through the electric voltage regulating circuit, and the two poles of the test oil cup can be punctured by the voltage with the phase difference of 180 degrees through the continuous boosting of the step-up transformer to generate a voltage pulse. The isolation induction transformer connected with the high-voltage side of the booster transformer can generate voltage pulses, the voltage pulses enter the pulse detection circuit, are amplified through the operational amplifier, and then are subjected to voltage tracing, and voltage drop is generated on the diode array to form a high-level signal. The high level signal enters the trigger to generate a pulse to the reset circuit to reset the processor.
The metering windings of the step-up transformer are connected end to end, and the sum of the voltage vectors of the two windings is used as the measured voltage and enters a high-voltage detection circuit. The processor acquires the high-voltage waveform in the test process at a high speed in real time through the AD converter, and takes the peak value of the measured waveform as the basis for calculating the effective value. The processor divides the peak voltage by root number two as the current breakdown voltage measurement, and at the same time, the effective value voltage calculated according to the root mean square is displayed on the instrument as a reference.
The low-voltage current detection circuit collects current in breakdown by a current transformer, converts the current into a voltage signal through level conversion, outputs the voltage signal to an AD converter for high-speed sampling, and enters a processor for processing after sampling. The processor analyzes signals collected by the low-voltage current detection circuit and the high-voltage discharge pulse detection module to obtain an accurate and reliable detection result.
The work flow of the processor is as follows: before the step-up transformer starts to step up, the processor stores the test data and the state into the EEPROM memory, and then starts to step up until the high-voltage side discharges. If the pulse detection circuit senses the pulse and the reset circuit is started by the high-voltage discharge pulse, the input relay of the tester circuit power supply is tripped, and the tester circuit is reset completely. Therefore, even if the high-voltage discharge pulse generates interference to the circuit at the moment, all the high-voltage discharge pulses are cleared again. The time delay circuit and the reset circuit enable the reset process to continue for a period of time so as to avoid the interference of discharge pulses and ensure that the circuit can reliably and normally work after the reset is finished. After the processor is reset, the test state stored in the memory and the last high-voltage peak value and effective value read in the test process are checked firstly and are used as the actually measured breakdown voltage value.
The above is only the preferred embodiment of the present invention, and it should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which will not affect the utility model and the utility of the patent.
Claims (6)
1. The novel insulating oil withstand voltage tester comprises an electric voltage regulating circuit, a step-up transformer, a high-voltage detection circuit, an AD converter and a processor which are sequentially connected, and is characterized by also comprising a low-voltage current detection circuit and a high-voltage discharge pulse detection module; the input end of the low-voltage current detection circuit is connected with the output end of the electric voltage regulation circuit, and the output end of the low-voltage current detection circuit is connected with the AD converter; the input end of the high-voltage discharge pulse detection module is connected with the high-voltage side winding of the boosting transformer through an isolation induction transformer, and the output end of the high-voltage discharge pulse detection module is connected with the input end of the processor.
2. The novel insulating oil withstand voltage tester as claimed in claim 1, wherein the high voltage discharge pulse detection module comprises a pulse adjusting circuit, a delay trigger circuit and a reset circuit; the input end of the pulse adjusting circuit is connected with the low-voltage side winding of the isolation induction transformer, and the output end of the pulse adjusting circuit is connected with the input end of the delay triggering circuit; the output end of the delay trigger circuit is connected with the input end of the reset circuit; and the output end of the reset circuit is connected with the input end of the processor.
3. The new insulating oil withstand voltage tester according to claim 2, wherein the pulse adjusting circuit comprises a first operational amplifier (OP1), a second operational amplifier (OP2), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a first diode (D1), a second diode (D2), and a Diode Array (DA); the first input end of the first operational amplifier (OP1) is connected with the inductor through a first resistor (R1), and the second input end of the first operational amplifier is respectively connected with the ground through a second resistor (R2) and the output end of the first operational amplifier through a third resistor (R3); the first input end of the second operational amplifier (OP2) is connected with the output end of the first operational amplifier (OP1), the second input end of the second operational amplifier is connected with the output end, and the output end of the second operational amplifier is connected with the input end of the delay trigger circuit through a fourth resistor (R4); after the first diode (D1) and the second diode (D2) are connected in parallel in an inverted mode, one end of the first diode is grounded, and the other end of the first diode is connected with a first input end of a first operational amplifier (OP 1); and after the Diode Array (DA) is connected with the fifth resistor (R5) in parallel, one end of the cathode is grounded, and the other end of the cathode is connected with the input end of the delay trigger circuit.
4. The novel insulating oil withstand voltage tester as claimed in claim 1, wherein the electric voltage regulating circuit comprises a power supply relay, an electric voltage regulator and a current limiting resistor; the input end of the voltage relay is connected with a power supply, and the output end of the voltage relay is connected with an input winding of the electric voltage regulator; the output winding of the electric voltage regulator is connected with a current-limiting resistor in series and is connected with the low-voltage side winding of the step-up transformer.
5. The novel insulating oil withstand voltage tester as claimed in claim 1, wherein the low-voltage current detection circuit is inductively connected with an output winding of the electric voltage regulator by taking a current transformer as an input end; the output end of the low-voltage current detection circuit is connected with the input end of the AD converter.
6. The novel insulating oil withstand voltage tester as claimed in claim 1, wherein the number of the step-up transformers is two, and low-voltage side windings of the two step-up transformers are connected with an output winding of the electric voltage regulator through a current-limiting resistor, and the connection polarities are opposite; one end of a high-voltage side winding of each of the two step-up transformers is connected with an electrode of the test oil cup, and the other end of the high-voltage side winding of each of the two step-up transformers is grounded; and the metering windings of the two step-up transformers are respectively connected with the input end of the high-voltage detection circuit.
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| CN201922086838.8U CN211236110U (en) | 2019-11-28 | 2019-11-28 | Novel insulating oil withstand voltage tester |
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| CN201922086838.8U CN211236110U (en) | 2019-11-28 | 2019-11-28 | Novel insulating oil withstand voltage tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748316A (en) * | 2020-12-31 | 2021-05-04 | 安徽新皖能检测有限公司 | Withstand voltage detection device for insulating oil and withstand voltage detection method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748316A (en) * | 2020-12-31 | 2021-05-04 | 安徽新皖能检测有限公司 | Withstand voltage detection device for insulating oil and withstand voltage detection method thereof |
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