CN110554342A - partial discharge signal calibration instrument capable of regulating voltage - Google Patents
partial discharge signal calibration instrument capable of regulating voltage Download PDFInfo
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- CN110554342A CN110554342A CN201810548553.9A CN201810548553A CN110554342A CN 110554342 A CN110554342 A CN 110554342A CN 201810548553 A CN201810548553 A CN 201810548553A CN 110554342 A CN110554342 A CN 110554342A
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- 238000012545 processing Methods 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000000919 ceramic Substances 0.000 claims description 6
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- 238000012360 testing method Methods 0.000 description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
the invention discloses a voltage-adjustable partial discharge signal calibration instrument which comprises a micro-processing chip, a signal generator, a driving amplification circuit, a controlled voltage source, a charging resistor, a discharging resistor, a first relay, a second relay and a capacitor. The working process of the invention is as follows: the signal generator is controlled by the microprocessor chip to output square wave signals, the first relay and the second relay are controlled to be switched on and off by the square wave signals, and the first relay and the second relay have opposite working logics, so that when the first relay is switched on and the second relay is switched off, the microprocessor chip controls the controlled voltage source to charge the capacitor through the charging resistor; when the first relay is disconnected and the second relay is closed, the charged capacitor is discharged through the discharge resistor, so that a local discharge generation process is simulated. The invention corrects the partial discharge tester by providing the calibration signal, reduces the error and ensures the accurate judgment of the partial discharge tester.
Description
Technical Field
the invention relates to the field of signal generation devices, in particular to a voltage-adjustable partial discharge signal calibration instrument.
Background
the partial discharge test has higher sensitivity. For newly designed and manufactured high-voltage electrical equipment, weak links in insulation can be found in time through partial discharge measurement, errors in design and manufacturing processes and improper use of materials are prevented, the method is an important method for identifying product insulation or equipment operation reliability, and equipment defects which cannot be found in a withstand voltage test can be found. Partial discharge testing is one of the important items of preventive testing of current power equipment.
however, due to the irregularity of the waveform of the partial discharge signal itself, the attenuation in the transmission process, the system interference and the error of the signal after entering the partial discharge tester, the final displayed partial discharge amount of the partial discharge tester is greatly different from the actual partial discharge amount of the cable. Therefore, the partial discharge tester is calibrated, and the method has important significance for ensuring the accuracy of the partial discharge test.
disclosure of Invention
the invention overcomes the defects of the existing GIS partial discharge test and provides a novel partial discharge signal calibration instrument capable of regulating voltage. The method comprises the steps of injecting a signal Q1 with known electric quantity into the partial discharge tester, observing the discharge quantity Q2 displayed by the partial discharge tester, and dividing the discharge quantity Q2 by the partial discharge tester to obtain a proportionality coefficient K, so that correction is completed.
in order to solve the technical problems, the technical scheme of the invention is as follows:
a voltage-adjustable partial discharge signal calibration instrument comprises a microprocessor chip, a signal generator, a drive amplifying circuit, a controlled voltage source, a charging resistor, a discharging resistor, a first relay, a second relay and a capacitor,
The first output end of the micro-processing chip is electrically connected with the input end of the signal generator;
the output end of the signal generator is electrically connected with the input end of the driving amplification circuit;
The output end of the driving amplification circuit is electrically connected with the control end of the first relay;
the output end of the driving amplification circuit is electrically connected with the control end of the second relay;
the action logic of the first relay is opposite to that of the second relay;
the second output end of the micro-processing chip is electrically connected with the control end of the controlled voltage source;
the output end of the controlled voltage source is electrically connected with one end of the charging resistor;
the other end of the charging resistor is electrically connected with one end of the switch side of the first relay;
the other end of the switch side of the first relay is electrically connected with one end of the capacitor;
the other end of the capacitor is grounded;
the other end of the switch side of the first relay is electrically connected with one end of the switch side of the second relay;
the other end of the switch side of the second relay is electrically connected with one end of the discharge resistor;
the other end of the discharge resistor is grounded.
The working process of the invention is as follows:
the signal generator is controlled by the microprocessor chip to output square wave signals, the first relay and the second relay are controlled to be switched on and off by the square wave signals, and the first relay and the second relay have opposite working logics, so that when the first relay is switched on and the second relay is switched off, the microprocessor chip controls the controlled voltage source to charge the capacitor through the charging resistor; when the first relay is disconnected and the second relay is closed, the charged capacitor is discharged through the discharge resistor, so that a local discharge generation process is simulated. And inputting the generated known partial discharge signal into the partial discharge tester, and calibrating the partial discharge tester by calculating the difference between the known partial discharge signal and the partial discharge tester.
This use novel well AD5292 adopts the 30V power supply, can provide 2.5A's electric current at the maximum, satisfies the quick charge target of electric capacity completely. And the AD5292 is internally provided with a memory, so that the resolution is high, the voltage precision can be accurately controlled, and 1024 adjustable voltage outputs are provided.
in a preferred scheme, the controlled voltage source comprises an AD5292 chip, a first operational amplifier, a first resistor, a first diode, a second diode, an N-channel MOS tube and a P-channel MOS tube, wherein,
the input end of the AD5292 chip is used as the control end of a controlled voltage source;
the output end of the AD5292 chip is electrically connected with the non-inverting input end of the first operational amplifier;
The output end of the first operational amplifier is electrically connected with the grid electrode of the N-channel MOS tube;
The source electrode of the N-channel MOS tube is grounded;
the source electrode of the N-channel MOS tube is electrically connected with the anode of the first diode;
the cathode of the first diode is electrically connected with the drain electrode of the N-channel MOS tube;
the drain electrode of the N-channel MOS tube is electrically connected with one end of the first resistor;
The other end of the first resistor is electrically connected with the drain electrode of the P-channel MOS tube;
The drain electrode of the P-channel MOS tube is electrically connected with the cathode of the second diode;
the anode of the second diode is electrically connected with the source electrode of the P-channel MOS tube;
the source electrode of the P-channel MOS tube is electrically connected with the inverting input end of the first operational amplifier, and the inverting input end of the first operational amplifier is used as the output end of the controlled voltage source.
in a preferred scheme, the driving amplifying circuit comprises a second resistor, a third resistor, a fourth resistor, a first diode, a second diode, an NPN triode and a PNP triode, wherein,
the cathode of the first diode is used as the input end of the driving amplifying circuit, and the anode of the first diode is electrically connected with one end of the third resistor;
The other end of the third resistor is electrically connected with a base level of the NPN triode;
the other end of the third resistor is electrically connected with one end of the second resistor;
the other end of the second resistor is connected with a positive power supply;
the collector of the NPN triode is connected with a positive power supply;
the emitting electrode of the NPN triode is electrically connected with the emitting electrode of the PNP triode, and the emitting electrode of the NPN triode is used as the output end of the driving amplifying circuit;
the cathode of the first diode is electrically connected with the anode of the second diode;
the cathode of the second diode is electrically connected with the base electrode of the PNP triode;
the cathode of the second diode is electrically connected with one end of the fourth resistor;
the other end of the fourth resistor is connected with a negative power supply;
And the collector of the PNP triode is connected with a negative power supply.
In a preferred embodiment, the capacitor is a high frequency ceramic chip capacitor.
in the preferred embodiment, the tile capacitor has a lower ESR (equivalent series resistance) than the electrolytic capacitor.
in a preferred embodiment, the first relay and the second relay are 5V relays.
in this preferred embodiment, the miniature relay is used to pass high current through the relay contacts, which may cause contact damage, so a 5V relay is required.
In a preferred embodiment, the signal generator is an ICL 8038.
In a preferred embodiment, the partial discharge signal calibration instrument further includes a display module, and an input end of the display module is electrically connected to a third output end of the microprocessor chip.
in a preferred embodiment, the first operational amplifier is an OP184 chip.
in the preferred embodiment, the OP184 chip has high slew rate, low noise and rail-to-rail input/output characteristics.
in the preferred embodiment, the display module is used for displaying the calibration signal output by the partial discharge signal calibration instrument.
compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention has simple structure and convenient operation, corrects the partial discharge tester by providing the calibration signal, reduces the error and ensures the accurate judgment of the partial discharge tester.
drawings
FIG. 1 is a block diagram of an embodiment.
fig. 2 is a block diagram of a controlled voltage source of an embodiment.
Detailed Description
the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
For the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
as shown in fig. 1, an ultrahigh frequency partial discharge signal simulator comprises an MSP430F5, an ICL8038, a driving amplifier circuit, a first 5V relay, a second 5V relay, a charging resistor, a discharging resistor, a controlled voltage source, an LCD display screen and a high frequency ceramic chip capacitor, wherein,
A first output terminal of MSP430F5 is electrically connected to an input terminal of ICL 8038;
The output end of the ICL8038 is electrically connected with the input end of the driving amplification circuit;
The output end of the driving amplification circuit is electrically connected with the control end of the first 5V relay;
The output end of the driving amplification circuit is electrically connected with the control end of the second 5V relay;
the action logic of the first 5V relay is opposite to that of the second 5V relay;
A second output terminal of the MSP430F5 is electrically connected to a control terminal of a controlled voltage source;
the output end of the controlled voltage source is electrically connected with one end of the charging resistor;
the other end of the charging resistor is electrically connected with one end of the switch side of the first 5V relay;
the other end of the switch side of the first 5V relay is electrically connected with one end of the high-frequency ceramic chip capacitor;
The other end of the high-frequency ceramic chip capacitor is grounded;
The other end of the switch side of the first 5V relay is electrically connected with one end of the switch side of the second 5V relay;
the other end of the switch side of the second 5V relay is electrically connected with one end of the discharge resistor;
the other end of the discharge resistor is grounded;
a second output of the MSP430F5 is electrically connected to an input of the LCD display screen.
as shown in fig. 2, the controlled voltage source includes an AD5292 chip, an OP184, a first resistor, a first diode, a second diode, an N-channel MOS transistor, and a P-channel MOS transistor, wherein,
the input end of the AD5292 chip is used as the control end of the controlled voltage source;
the output end of the AD5292 chip is electrically connected with the non-inverting input end of the OP 184;
The output end of the OP184 is electrically connected with the grid electrode of the N-channel MOS tube;
the source electrode of the N-channel MOS tube is grounded;
the source electrode of the N-channel MOS tube is electrically connected with the anode of the first diode;
The cathode of the first diode is electrically connected with the drain electrode of the N-channel MOS tube;
the drain electrode of the N-channel MOS tube is electrically connected with one end of the first resistor;
The other end of the first resistor is electrically connected with the drain electrode of the P-channel MOS tube;
The drain electrode of the P-channel MOS tube is electrically connected with the cathode of the second diode;
the anode of the second diode is electrically connected with the source electrode of the P-channel MOS tube;
the source electrode of the P-channel MOS tube is electrically connected with the inverting input end of the OP184, and the inverting input end of the OP184 is used as the output end of the controlled voltage source.
Wherein the driving amplifying circuit comprises a second resistor, a third resistor, a fourth resistor, a first diode, a second diode, an NPN triode and a PNP triode,
the cathode of the first diode is used as the input end of the driving amplifying circuit, and the anode of the first diode is electrically connected with one end of the third resistor;
the other end of the third resistor is electrically connected with the base level of the NPN triode;
The other end of the third resistor is electrically connected with one end of the second resistor;
the other end of the second resistor is connected with the positive power supply;
the collector of the NPN triode is connected with the positive power supply;
an emitting electrode of the NPN triode is electrically connected with an emitting electrode of the PNP triode, and the emitting electrode of the NPN triode is used as an output end of the driving amplifying circuit;
The cathode of the first diode is electrically connected with the anode of the second diode;
The cathode of the second diode is electrically connected with the base electrode of the PNP triode;
the cathode of the second diode is electrically connected with one end of the fourth resistor;
the other end of the fourth resistor is connected with a negative power supply;
the collector of the PNP triode is connected with the negative power supply.
the working process of the embodiment is as follows:
the ICL8038 is controlled to output square wave signals through the MSP430F5, the first 5V relay and the second 5V relay are controlled to be switched on and off through the square wave signals, and due to the fact that the working logics of the first 5V relay and the second 5V relay are opposite, when the first 5V relay is closed and the second 5V relay is switched off, the MSP430F5 controls the controlled voltage source to charge the high-frequency ceramic capacitor through the charging resistor; when the first 5V relay is disconnected and the second 5V relay is closed, the charged high-frequency ceramic chip capacitor is discharged through the discharge resistor, so that a local discharge generation process is simulated. And inputting the generated known partial discharge signal into the partial discharge tester, and calibrating the partial discharge tester by calculating the difference between the known partial discharge signal and the partial discharge tester.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (9)
1. a voltage-adjustable partial discharge signal calibration instrument is characterized by comprising a micro-processing chip, a signal generator, a driving amplification circuit, a controlled voltage source, a charging resistor, a discharging resistor, a first relay, a second relay and a capacitor, wherein,
The first output end of the micro-processing chip is electrically connected with the input end of the signal generator;
the output end of the signal generator is electrically connected with the input end of the driving amplification circuit;
the output end of the driving amplification circuit is electrically connected with the control end of the first relay;
the output end of the driving amplification circuit is electrically connected with the control end of the second relay;
the action logic of the first relay is opposite to that of the second relay;
The second output end of the micro-processing chip is electrically connected with the control end of the controlled voltage source;
the output end of the controlled voltage source is electrically connected with one end of the charging resistor;
the other end of the charging resistor is electrically connected with one end of the switch side of the first relay;
The other end of the switch side of the first relay is electrically connected with one end of the capacitor;
the other end of the capacitor is grounded;
the other end of the switch side of the first relay is electrically connected with one end of the switch side of the second relay;
the other end of the switch side of the second relay is electrically connected with one end of the discharge resistor;
the other end of the discharge resistor is grounded.
2. the partial discharge signal calibration instrument according to claim 1, wherein the controlled voltage source comprises an AD5292 chip, a first operational amplifier, a first resistor, a first diode, a second diode, an N-channel MOS transistor and a P-channel MOS transistor, wherein,
the input end of the AD5292 chip is used as the control end of a controlled voltage source;
the output end of the AD5292 chip is electrically connected with the non-inverting input end of the first operational amplifier;
The output end of the first operational amplifier is electrically connected with the grid electrode of the N-channel MOS tube;
the source electrode of the N-channel MOS tube is grounded;
the source electrode of the N-channel MOS tube is electrically connected with the anode of the first diode;
the cathode of the first diode is electrically connected with the drain electrode of the N-channel MOS tube;
The drain electrode of the N-channel MOS tube is electrically connected with one end of the first resistor;
The other end of the first resistor is electrically connected with the drain electrode of the P-channel MOS tube;
the drain electrode of the P-channel MOS tube is electrically connected with the cathode of the second diode;
the anode of the second diode is electrically connected with the source electrode of the P-channel MOS tube;
The source electrode of the P-channel MOS tube is electrically connected with the inverting input end of the first operational amplifier, and the inverting input end of the first operational amplifier is used as the output end of the controlled voltage source.
3. The partial discharge signal calibration instrument according to claim 1 or 2, wherein the driving amplification circuit comprises a second resistor, a third resistor, a fourth resistor, a first diode, a second diode, an NPN triode, and a PNP triode, wherein,
The cathode of the first diode is used as the input end of the driving amplifying circuit, and the anode of the first diode is electrically connected with one end of the third resistor;
the other end of the third resistor is electrically connected with a base level of the NPN triode;
The other end of the third resistor is electrically connected with one end of the second resistor;
The other end of the second resistor is connected with a positive power supply;
the collector of the NPN triode is connected with a positive power supply;
the emitting electrode of the NPN triode is electrically connected with the emitting electrode of the PNP triode, and the emitting electrode of the NPN triode is used as the output end of the driving amplifying circuit;
The cathode of the first diode is electrically connected with the anode of the second diode;
The cathode of the second diode is electrically connected with the base electrode of the PNP triode;
the cathode of the second diode is electrically connected with one end of the fourth resistor;
the other end of the fourth resistor is connected with a negative power supply;
and the collector of the PNP triode is connected with a negative power supply.
4. the partial discharge signal calibration instrument according to claim 3, wherein said capacitor is a ceramic chip capacitor.
5. the partial discharge signal calibration instrument according to any one of claims 1 to 4, wherein the first relay and the second relay are 5V relays.
6. the partial discharge signal calibration instrument according to claim 5, wherein said signal generator is ICL 8038.
7. The partial discharge signal calibration instrument according to claim 1, 2 or 4, wherein the signal generator is ICL 8038.
8. The partial discharge signal calibration instrument according to claim 1, 2, 4 or 6, further comprising a display module, wherein an input terminal of the display module is electrically connected to the third output terminal of the microprocessor chip.
9. The partial discharge signal calibration instrument according to claim 7, further comprising a display module, wherein an input terminal of the display module is electrically connected to the third output terminal of the microprocessor chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810548553.9A CN110554342A (en) | 2018-05-31 | 2018-05-31 | partial discharge signal calibration instrument capable of regulating voltage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810548553.9A CN110554342A (en) | 2018-05-31 | 2018-05-31 | partial discharge signal calibration instrument capable of regulating voltage |
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| CN110554342A true CN110554342A (en) | 2019-12-10 |
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Citations (3)
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|---|---|---|---|---|
| CN104793679A (en) * | 2015-03-30 | 2015-07-22 | 苏州锟恩电子科技有限公司 | Programmable high-voltage source device |
| CN107561468A (en) * | 2017-06-27 | 2018-01-09 | 广东电网有限责任公司佛山供电局 | A kind of superfrequency partial enlargement signal generator |
| CN208569014U (en) * | 2018-05-31 | 2019-03-01 | 广东电网有限责任公司 | A kind of Partial discharge signal marking apparatus of pressure-adjustable |
-
2018
- 2018-05-31 CN CN201810548553.9A patent/CN110554342A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104793679A (en) * | 2015-03-30 | 2015-07-22 | 苏州锟恩电子科技有限公司 | Programmable high-voltage source device |
| CN107561468A (en) * | 2017-06-27 | 2018-01-09 | 广东电网有限责任公司佛山供电局 | A kind of superfrequency partial enlargement signal generator |
| CN208569014U (en) * | 2018-05-31 | 2019-03-01 | 广东电网有限责任公司 | A kind of Partial discharge signal marking apparatus of pressure-adjustable |
Non-Patent Citations (1)
| Title |
|---|
| 杜林等: "多参数调节的超高频局部放电信号模拟源研制", 高电压技术, vol. 42, no. 1, pages 163 - 171 * |
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