CN110542783A - Current testing device for CVT secondary voltage testing device - Google Patents
Current testing device for CVT secondary voltage testing device Download PDFInfo
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- CN110542783A CN110542783A CN201810524901.9A CN201810524901A CN110542783A CN 110542783 A CN110542783 A CN 110542783A CN 201810524901 A CN201810524901 A CN 201810524901A CN 110542783 A CN110542783 A CN 110542783A
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- 238000012360 testing method Methods 0.000 title claims abstract description 46
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 10
- 230000003321 amplification Effects 0.000 claims abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 63
- 238000004891 communication Methods 0.000 claims description 8
- 238000012806 monitoring device Methods 0.000 abstract description 6
- 238000013500 data storage Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
the invention discloses a current testing device for a CVT secondary voltage testing device, which comprises a relay, a current-voltage converter, a proportional operation circuit, an AD conversion module, a voltage amplification circuit and a microprocessor chip, wherein the switch side of the relay is arranged between the secondary side of the CVT and the voltage testing device; the input end of the current-voltage converter collects the current of the secondary side of the CVT, and the output end of the current-voltage converter is electrically connected with the input end of the proportional operation circuit; the output end of the proportional operation circuit is electrically connected with the input end of the AD conversion module; the output end of the AD conversion module is electrically connected with the input end of the micro-processing chip; the first output end of the micro-processing chip is electrically connected with the input end of the voltage amplifying circuit; the output end of the voltage amplifying circuit is electrically connected with the control end of the relay. The invention can monitor the current of the CVT acquisition end, and when the current exceeds the threshold value, the test loop is disconnected, thereby preventing the short circuit phenomenon on the secondary side of the CVT and effectively protecting the CVT equipment and the CVT voltage on-line monitoring device.
Description
Technical Field
the invention relates to the field of current testing, in particular to a current testing device for a CVT secondary voltage testing device.
Background
a Capacitor Voltage Transformer (CVT) is widely used in an electric power system, mainly used for monitoring the Voltage conditions of a power bus and a line, and is an electric power device for Voltage measurement, power measurement and control, automatic control and relay protection and also used as a power line carrier Capacitor.
the CVT mainly obtains the voltage of a bus or a line in a capacitance voltage division mode, and then the actual voltage of the bus or the line is reduced to the secondary side of 100V/57.7V at the maximum through an electromagnetic transformer. Then the system such as dispatching and relay protection is used for obtaining the voltage, and the actual voltage of the bus or the line is reversely deduced. During actual operation, the voltage acquired by the dispatching and relay protection system from the CVT can only be used for monitoring the operation condition of the bus or the line, the condition of the CVT equipment is not concerned, and if the CVT fails, the voltage monitoring is abnormal, which may cause misjudgment on the dispatching and relay protection system. Therefore, ensuring the CVT healthy operation is very important for the stable operation of the power system.
Therefore, the existing electric power enterprises use the CVT voltage online monitoring device to judge the health status of the CVT by acquiring CVT voltage data from the scheduling system. But the CVT voltage goes through a long physical and communication link to the scheduling system. And the voltage of the dispatching system can be caused to be in a problem if the information is transmitted by mistake or the contact is poor. Therefore, whether the CVT is defective or not cannot be accurately judged even if the voltage is wrong. However, if a short circuit or other fault occurs on the secondary side of the CVT or on the collection port of the device, the device may be damaged, and the CVT device may even be damaged, which may cause serious problems.
disclosure of Invention
the invention overcomes the defects of the existing CVT detection and provides a novel current testing device for a CVT secondary voltage testing device. The invention realizes that the current of the CVT acquisition end can be monitored when the CVT on-line monitoring device works, and the test loop is disconnected when the current exceeds the set threshold value, thereby preventing the short circuit phenomenon on the secondary side of the CVT and effectively protecting the CVT equipment and the CVT voltage on-line monitoring device.
in order to solve the technical problems, the technical scheme of the invention is as follows:
A current testing device for CVT secondary voltage testing device comprises a relay, a current-voltage converter, a proportional operation circuit, an AD conversion module, a voltage amplification circuit and a microprocessor chip,
the switch side of the relay is arranged between the secondary side of the CVT and the voltage testing device, and when the switch side of the relay is disconnected, the voltage testing device cannot acquire a voltage signal of the secondary side of the CVT;
The current-voltage converter is arranged at a test point of the secondary side of the CVT, the input end of the current-voltage converter collects the current of the secondary side of the CVT, and the output end of the current-voltage converter is electrically connected with the input end of the proportional operation circuit;
The output end of the proportional operation circuit is electrically connected with the input end of the AD conversion module;
the output end of the AD conversion module is electrically connected with the input end of the micro-processing chip;
the first output end of the micro-processing chip is electrically connected with the input end of the voltage amplifying circuit;
the output end of the voltage amplifying circuit is electrically connected with the control end of the relay, and the control end of the relay can control the on/off state of the switch side of the relay.
the working process of the invention is as follows:
the current-voltage converter converts a current signal (0-1A) on the secondary side of the CVT into a voltage signal (0-24V)
) And voltage signals are subjected to voltage division through a proportional operation circuit, and then analog-to-digital conversion is performed through an AD conversion module to obtain digital voltage division signals. And the micro-processing chip judges whether the secondary side of the CVT has a short circuit phenomenon or not according to the digital voltage division signal. If the short circuit phenomenon occurs, the micro-processing chip sends out a high-voltage signal, the voltage is boosted through the voltage amplifying circuit, and therefore the relay is triggered to disconnect a test circuit on the secondary side of the CVT, and relevant equipment is protected.
In a preferred embodiment, the proportional operation circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and an operational amplifier, wherein,
one end of the first resistor is used as the input end of the proportional operation circuit, and one end of the first resistor is electrically connected with one end of the third resistor;
the other end of the third resistor is electrically connected with the non-inverting input end of the operational amplifier;
The other end of the third resistor is electrically connected with one end of a fifth resistor;
The other end of the fifth resistor is grounded;
The other end of the first resistor is electrically connected with one end of the second resistor;
the other end of the second resistor is grounded;
The other end of the first resistor is electrically connected with one end of the fourth resistor;
The other end of the fourth resistor is electrically connected with the inverting input end of the operational amplifier;
The other end of the fourth resistor is electrically connected with one end of the sixth resistor;
the other end of the sixth resistor is electrically connected with the output end of the operational amplifier, and the output end of the operational amplifier is used as the output end of the proportional operational circuit.
in a preferred embodiment, the operational amplifier is a rail-to-rail operational amplifier.
in the preferred embodiment, the rail-to-rail operational amplifier has an input overvoltage protection function, and no inversion or latch occurs in a range higher or lower than the voltage of the power supply rail within 32V. When the acquisition end is suddenly disconnected or other problems cause overlarge acquisition voltage, overvoltage protection can be carried out on the testing device.
In a preferred embodiment, the resistance of the third resistor in the proportional operation circuit is equal to the resistance of the fourth resistor; the resistance value of the fifth resistor is equal to the resistance value of the sixth resistor.
The preferred solution consists in simplifying the circuit design.
in a preferred embodiment, the resistance value of the third resistor in the proportional operation circuit is equal to the resistance value of the fifth resistor.
the preferred solution consists in simplifying the circuit design.
In a preferred embodiment, the current testing device further includes a low-pass filter circuit, an input end of the low-pass filter circuit is electrically connected to an output end of the proportional operation circuit, and an output end of the low-pass filter circuit is electrically connected to an input end of the AD conversion module.
in the preferred embodiment, the filter circuit filters out high-frequency noise in the signal at the output terminal of the proportional operation circuit.
In a preferred embodiment, the low-pass filter circuit includes a first adjustable capacitor, a second adjustable capacitor, a third adjustable capacitor, and an inductor, wherein,
one end of the inductor is used as the input end of the low-pass filter circuit, and the other end of the inductor is used as the output end of the low-pass filter circuit;
One end of the inductor is electrically connected with one end of the first adjustable capacitor;
the other end of the first adjustable capacitor is grounded;
one end of the inductor is electrically connected with one end of the second adjustable capacitor;
the other end of the inductor is electrically connected with the other end of the second adjustable capacitor;
The other end of the inductor is electrically connected with one end of the third adjustable capacitor;
the other end of the third adjustable capacitor is grounded.
in the preferred scheme, the filtering frequency can be adjusted by adjusting the three adjusting capacitors.
in a preferred embodiment, the voltage amplifying circuit includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second capacitor, a third capacitor, a fourth capacitor, and an NPN transistor, wherein,
one end of the second capacitor is used as the input end of the voltage amplifying circuit, and the other end of the second capacitor is electrically connected with the base level of the NPN triode;
the other end of the second capacitor is electrically connected with one end of the seventh resistor;
The other end of the second capacitor is electrically connected with one end of the eighth resistor;
the other end of the seventh resistor is connected with a power supply;
the other end of the eighth resistor is grounded;
the other end of the seventh resistor is electrically connected with one end of the ninth resistor;
the other end of the ninth resistor is electrically connected with a collector of the NPN triode;
The emitter of the NPN triode is electrically connected with one end of the tenth resistor;
the other end of the tenth resistor is electrically connected with the other end of the eighth resistor;
the emitter of the NPN triode is electrically connected with one end of the fourth capacitor;
The other end of the tenth resistor is electrically connected with the other end of the fourth capacitor;
and the collector of the NPN triode is electrically connected with one end of a third capacitor, and the other end of the third capacitor is used as the output end of the voltage amplifying circuit.
in a preferred embodiment, the current testing apparatus further includes a data storage, and an input terminal of the data storage is electrically connected to the second output terminal of the microprocessor chip.
in the preferred embodiment, the data storage is used to store relevant short circuit information on the secondary side of the CVT.
in a preferred scheme, the current testing device further comprises a wireless communication module, and an input end of the wireless communication module is electrically connected with a third output end of the micro-processing chip.
in the preferred scheme, the wireless communication module is used for sending the short-circuit information of the secondary side of the CVT to a remote system or the hands of a worker.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention realizes that the current of the CVT acquisition end can be monitored when the CVT on-line monitoring device works, and the test loop is disconnected when the current exceeds the set threshold value, thereby preventing the short circuit phenomenon on the secondary side of the CVT and effectively protecting the CVT equipment and the CVT voltage on-line monitoring device.
Drawings
fig. 1 is a module installation diagram of the 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, a current testing device for a CVT secondary voltage testing device includes a relay, a current-voltage converter, a proportional operation circuit, an AD7920, a voltage amplification circuit, a low pass filter circuit, a 4G communication module, a TF card, and an MSP430F5, wherein,
The switch side of the relay is arranged between the secondary side of the CVT and the voltage testing device, and when the switch side of the relay is disconnected, the voltage testing device cannot acquire a voltage signal of the secondary side of the CVT;
the current-voltage converter is arranged at a test point of the secondary side of the CVT, the input end of the current-voltage converter collects the current of the secondary side of the CVT, and the output end of the current-voltage converter is electrically connected with the input end of the proportional operation circuit;
the output end of the proportional operation circuit is electrically connected with the input end of the low-pass filter circuit;
the output end of the low-pass filter circuit is electrically connected with the input end of the AD conversion module;
the output end of the AD conversion module is electrically connected with the input end of the micro-processing chip;
a first output end of the MSP430F5 is electrically connected with an input end of the voltage amplifying circuit;
the output end of the voltage amplifying circuit is electrically connected with the control end of the relay, and the control end of the relay can control the on/off state of the switch side of the relay;
a second output of the MSP430F5 is electrically connected to an input of the 4G communication module;
A third output of the MSP430F5 is electrically connected to an input of the TF card.
wherein the proportional operation circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and ADA4096,
one end of the first resistor is used as the input end of the proportional operation circuit, and one end of the first resistor is electrically connected with one end of the third resistor;
The other end of the third resistor is electrically connected with the non-inverting input end of the ADA 4096;
The other end of the third resistor is electrically connected with one end of the fifth resistor;
the other end of the fifth resistor is grounded;
The other end of the first resistor is electrically connected with one end of the second resistor;
the other end of the second resistor is grounded;
the other end of the first resistor is electrically connected with one end of the fourth resistor;
the other end of the fourth resistor is electrically connected with the inverting input end of the ADA 4096;
The other end of the fourth resistor is electrically connected with one end of the sixth resistor;
the other end of the sixth resistor is electrically connected with the output end of the ADA4096, and the output end of the ADA4096 is used as the output end of the proportional operation circuit;
the resistance value of the third resistor is equal to that of the fourth resistor;
the resistance value of the fifth resistor is equal to that of the sixth resistor;
the resistance value of the third resistor is equal to that of the fifth resistor.
the low-pass filter circuit comprises a first adjustable capacitor, a second adjustable capacitor, a third adjustable capacitor and an inductor, wherein one end of the inductor is used as the input end of the low-pass filter circuit, and the other end of the inductor is used as the output end of the low-pass filter circuit;
one end of the inductor is electrically connected with one end of the first adjustable capacitor;
the other end of the first adjustable capacitor is grounded;
One end of the inductor is electrically connected with one end of the second adjustable capacitor;
the other end of the inductor is electrically connected with the other end of the second adjustable capacitor;
the other end of the inductor is electrically connected with one end of the third adjustable capacitor;
the other end of the third adjustable capacitor is grounded.
The voltage amplifying circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second capacitor, a third capacitor, a fourth capacitor and an NPN triode, wherein one end of the second capacitor is used as the input end of the voltage amplifying circuit, and the other end of the second capacitor is electrically connected with the base level of the NPN triode;
The other end of the second capacitor is electrically connected with one end of the seventh resistor;
the other end of the second capacitor is electrically connected with one end of the eighth resistor;
the other end of the seventh resistor is connected with a power supply;
the other end of the eighth resistor is grounded;
the other end of the seventh resistor is electrically connected with one end of the ninth resistor;
the other end of the ninth resistor is electrically connected with a collector of the NPN triode;
the emitter of the NPN triode is electrically connected with one end of the tenth resistor;
the other end of the tenth resistor is electrically connected with the other end of the eighth resistor;
the emitter of the NPN triode is electrically connected with one end of the fourth capacitor;
the other end of the tenth resistor is electrically connected with the other end of the fourth capacitor;
And the collector of the NPN triode is electrically connected with one end of a third capacitor, and the other end of the third capacitor is used as the output end of the voltage amplifying circuit.
the working process of the embodiment is as follows:
the MSP430F5 receives the data, when the voltage output by the proportional operation circuit is larger than 1.2V, the secondary side of the CVT can be judged to have a fault, and the single chip microcomputer generates a high level on the P1. And then the voltage amplifying circuit is connected to a coil of the relay, so that the normally closed contact is controlled to be disconnected, and the whole test circuit is disconnected for protecting the secondary side.
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 (10)
1. a current testing device for CVT secondary voltage testing device comprises a relay, a current-voltage converter, a proportional operation circuit, an AD conversion module, a voltage amplification circuit and a microprocessor chip,
the switch side of the relay is arranged between the secondary side of the CVT and the voltage testing device, and when the switch side of the relay is disconnected, the voltage testing device cannot acquire a voltage signal of the secondary side of the CVT;
the current-voltage converter is arranged at a test point of the secondary side of the CVT, the input end of the current-voltage converter collects the current of the secondary side of the CVT, and the output end of the current-voltage converter is electrically connected with the input end of the proportional operation circuit;
the output end of the proportional operation circuit is electrically connected with the input end of the AD conversion module;
the output end of the AD conversion module is electrically connected with the input end of the micro-processing chip;
the first output end of the micro-processing chip is electrically connected with the input end of the voltage amplifying circuit;
the output end of the voltage amplifying circuit is electrically connected with the control end of the relay, and the control end of the relay can control the on/off state of the switch side of the relay.
2. the current testing device of claim 1, wherein the proportional operational circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and an operational amplifier,
one end of the first resistor is used as the input end of the proportional operation circuit, and one end of the first resistor is electrically connected with one end of the third resistor;
the other end of the third resistor is electrically connected with the non-inverting input end of the operational amplifier;
the other end of the third resistor is electrically connected with one end of a fifth resistor;
The other end of the fifth resistor is grounded;
The other end of the first resistor is electrically connected with one end of the second resistor;
The other end of the second resistor is grounded;
The other end of the first resistor is electrically connected with one end of the fourth resistor;
The other end of the fourth resistor is electrically connected with the inverting input end of the operational amplifier;
The other end of the fourth resistor is electrically connected with one end of the sixth resistor;
the other end of the sixth resistor is electrically connected with the output end of the operational amplifier, and the output end of the operational amplifier is used as the output end of the proportional operational circuit.
3. the current testing device of claim 2, wherein the operational amplifier is a rail-to-rail operational amplifier.
4. the current testing device of claim 3, wherein the third resistor and the fourth resistor in the proportional operation circuit have the same resistance value; the resistance value of the fifth resistor is equal to the resistance value of the sixth resistor.
5. the current testing device of claim 4, wherein the third resistor and the fifth resistor in the proportional operation circuit have the same resistance.
6. The current testing device according to any one of claims 1 to 5, further comprising a low pass filter circuit, wherein an input terminal of the low pass filter circuit is electrically connected to an output terminal of the proportional operation circuit, and an output terminal of the low pass filter circuit is electrically connected to an input terminal of the AD conversion module.
7. the current testing device according to claim 6, wherein the low pass filter circuit comprises a first tunable capacitor, a second tunable capacitor, a third tunable capacitor, and an inductor, wherein,
one end of the inductor is used as the input end of the low-pass filter circuit, and the other end of the inductor is used as the output end of the low-pass filter circuit;
One end of the inductor is electrically connected with one end of the first adjustable capacitor;
the other end of the first adjustable capacitor is grounded;
one end of the inductor is electrically connected with one end of the second adjustable capacitor;
the other end of the inductor is electrically connected with the other end of the second adjustable capacitor;
The other end of the inductor is electrically connected with one end of the third adjustable capacitor;
the other end of the third adjustable capacitor is grounded.
8. the current testing device according to claim 1, 2, 3, 4, 5 or 7, wherein the voltage amplifying circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second capacitor, a third capacitor, a fourth capacitor and an NPN transistor, wherein,
one end of the second capacitor is used as the input end of the voltage amplifying circuit, and the other end of the second capacitor is electrically connected with the base level of the NPN triode;
the other end of the second capacitor is electrically connected with one end of the seventh resistor;
The other end of the second capacitor is electrically connected with one end of the eighth resistor;
the other end of the seventh resistor is connected with a power supply;
the other end of the eighth resistor is grounded;
The other end of the seventh resistor is electrically connected with one end of the ninth resistor;
the other end of the ninth resistor is electrically connected with a collector of the NPN triode;
the emitter of the NPN triode is electrically connected with one end of the tenth resistor;
The other end of the tenth resistor is electrically connected with the other end of the eighth resistor;
The emitter of the NPN triode is electrically connected with one end of the fourth capacitor;
The other end of the tenth resistor is electrically connected with the other end of the fourth capacitor;
and the collector of the NPN triode is electrically connected with one end of a third capacitor, and the other end of the third capacitor is used as the output end of the voltage amplifying circuit.
9. the current testing device of claim 8, further comprising a data memory, wherein an input of the data memory is electrically connected to the second output of the microprocessor chip.
10. The current testing device according to claim 1, 2, 3, 4, 5, 7 or 9, wherein the current testing device further comprises a wireless communication module, and an input terminal of the wireless communication module is electrically connected to the third output terminal of the microprocessor chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810524901.9A CN110542783A (en) | 2018-05-28 | 2018-05-28 | Current testing device for CVT secondary voltage testing device |
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| CN201810524901.9A CN110542783A (en) | 2018-05-28 | 2018-05-28 | Current testing device for CVT secondary voltage testing device |
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| CN208607278U (en) * | 2018-05-28 | 2019-03-15 | 广东电网有限责任公司 | A kind of current testing device for CVT secondary voltage test device |
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| CN104266760A (en) * | 2014-09-18 | 2015-01-07 | 电子科技大学 | Bias voltage generating circuit of uncooled infrared detector |
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