CN215728417U - Leakage current detection device for high-voltage insulation equipment - Google Patents
Leakage current detection device for high-voltage insulation equipment Download PDFInfo
- Publication number
- CN215728417U CN215728417U CN202121446558.4U CN202121446558U CN215728417U CN 215728417 U CN215728417 U CN 215728417U CN 202121446558 U CN202121446558 U CN 202121446558U CN 215728417 U CN215728417 U CN 215728417U
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- leakage current
- frequency conversion
- current detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
A leakage current detection device for high-voltage insulation equipment comprises a leakage current signal extraction module, an isolation module and a host; the leakage current signal extraction module comprises a sampling resistor, a sampling circuit, an amplifying circuit and a voltage-frequency conversion circuit which are connected in sequence; the host comprises a frequency acquisition circuit and a processor; the output end of the voltage-frequency conversion circuit is in signal connection with the frequency acquisition circuit through the isolation module, and the frequency acquisition circuit is connected with the processor.
Description
Technical Field
The utility model relates to a link of high-voltage power transmission and transformation in electric power systems and other fields, in particular to a leakage current detection device of high-voltage insulation equipment.
Background
Reliability and stability of power systems are the most basic requirements of each power utilization department for the power industry. The high-voltage insulation equipment is high in voltage, ageing or breakdown occurs inside the high-voltage insulation equipment, leakage current can be generated, insulation breakdown and failure can be caused by the leakage current, so that serious power failure is caused, and the online detection of the leakage current is significant. However, the leakage current online detection technology in the prior art has poor strong electromagnetic interference resistance, high cost and larger volume.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems, the utility model provides a leakage current detection device for high-voltage insulation equipment, which adopts the following technical scheme:
a leakage current detection device for high-voltage insulation equipment comprises a leakage current signal extraction module, an isolation module and a host;
the leakage current signal extraction module comprises a sampling resistor, a sampling circuit, an amplifying circuit and a voltage-frequency conversion circuit which are connected in sequence;
the host comprises a frequency acquisition circuit and a processor;
the isolation module is a photoelectric isolation circuit;
the output end of the voltage-frequency conversion circuit is in signal connection with the frequency acquisition circuit through the isolation module, and the frequency acquisition circuit is connected with the processor.
Furthermore, the sampling circuit comprises a sampling retainer and a voltage comparator, the output voltage and the input voltage of the sampling retainer are respectively connected with two input ends of the voltage comparator, the output end of the voltage comparator is connected with the input end of the amplifying circuit, and the output end of the amplifying circuit is connected with the input end of the voltage-frequency conversion circuit.
Furthermore, the number of the leakage current signal extraction modules is multiple, the photoelectric isolation circuit comprises a plurality of optical fiber channels, a multi-channel selection switch is arranged on the host, each optical fiber channel is connected with one leakage current signal extraction module, and the photoelectric isolation circuit is connected with the frequency acquisition circuit through the multi-channel selection switch.
Furthermore, the voltage-frequency conversion circuit comprises a voltage-frequency conversion chip, the input end of the voltage-frequency conversion chip is connected with the output end of the amplifying circuit, and the output end of the voltage-frequency conversion chip is connected with the light emitting diode of the photoelectric isolation circuit.
Further, the host computer further comprises a communication circuit, a storage circuit and a display device.
Furthermore, two ends of the sampling resistor are connected in parallel with a protection circuit.
By adopting the leakage current detection device for the high-voltage insulation equipment, the low cost of strong electromagnetic interference resistance can be realized, the size is small, the portability is realized, the cost is low, the non-contact safety coefficient is high, the leakage current detection device is suitable for online detection of the leakage current of electrical equipment such as a lightning arrester, an insulator and the like, and the application prospect is wide.
Drawings
Fig. 1 is a schematic diagram of a leakage current signal extraction module system of a leakage current detection device for high-voltage insulation equipment.
Fig. 2 is a schematic diagram of a host system of a leakage current detection device for high voltage insulation equipment.
Fig. 3 is a circuit schematic of a sampling circuit.
FIG. 4 is a schematic circuit diagram of a voltage-to-frequency conversion circuit
Detailed Description
The leakage current detection device for the high-voltage insulation equipment shown in fig. 1 and 2 comprises a leakage current signal extraction module, an isolation module and a host CPU; the leakage current signal extraction module comprises a sampling resistor, a sampling circuit, an amplifying circuit and a voltage-frequency conversion circuit which are connected in sequence, wherein two ends of the sampling resistor are connected with a protection circuit in parallel, and the protection circuit can adopt two voltage-stabilizing diodes which are connected in series in a reverse direction; the host comprises a frequency acquisition circuit and a processor; the isolation module is a photoelectric isolation circuit; the output end of the voltage-frequency conversion circuit is in signal connection with the frequency acquisition circuit through the isolation module, and the frequency acquisition circuit is connected with the processor.
The sampling circuit of this application is shown in fig. 3, including sample holder LF398 and voltage comparator LM311, the output voltage and the input voltage of sample holder LF398 are connected respectively voltage comparator LM 311's two inputs for the comparison of voltage, voltage comparator LM 311's output with amplifier circuit's input is connected, and when output voltage was greater than input voltage, the output low level, otherwise is the high level, amplifier circuit's output and voltage-to-frequency conversion circuit's input are connected.
This application leakage current signal draws the quantity of module and is a plurality of, photoelectric isolation circuit includes a plurality of fibre channel, be equipped with the multiple choice switch on the host computer, every fibre channel connects one the leakage current signal draws the module, photoelectric isolation circuit passes through the multiple choice switch with frequency acquisition circuit connects, adopts above-mentioned structure can realize that a host computer detects the leakage current of a plurality of check points.
The voltage-frequency conversion circuit of the present application is shown in fig. 4, and includes a voltage-frequency conversion chip MC14046, which can output a current with a set frequency according to an input voltage, an input terminal of the voltage-frequency conversion chip MC14046 is connected to an output terminal of the amplifying circuit, and an output terminal of the voltage-frequency conversion chip MC14046 is connected to a light emitting diode HFBR1404 of the optoelectronic isolation circuit, so as to realize photoelectric conversion.
As an optimization, the host of the present application further includes a communication circuit, a storage circuit, and a display device, which are respectively used for transmitting, storing, and displaying the detection data.
When the device is used, the sampling resistor is connected between an insulating device to be tested and the ground, leakage current flows through the sampling resistor, the sampling circuit obtains signals, amplifies the signals, converts the signals into certain pulse signals through the voltage-frequency conversion circuit, transmits the pulse signals to the host through the isolation module to process data, and transmits, stores and displays the data through the communication circuit, the storage circuit and the display device respectively, so that the leakage current can be monitored in real time.
The above description is only an embodiment of the present invention, and the modifications that can be easily conceived by those skilled in the art within the scope of the present invention are all covered within the protection scope of the present invention.
Claims (6)
1. A leakage current detection device of high-voltage insulation equipment is characterized by comprising a leakage current signal extraction module, an isolation module and a host;
the leakage current signal extraction module comprises a sampling resistor, a sampling circuit, an amplifying circuit and a voltage-frequency conversion circuit which are connected in sequence;
the host comprises a frequency acquisition circuit and a processor;
the isolation module is a photoelectric isolation circuit;
the output end of the voltage-frequency conversion circuit is in signal connection with the frequency acquisition circuit through the isolation module, and the frequency acquisition circuit is connected with the processor.
2. A high voltage insulating apparatus leakage current detection device as claimed in claim 1, wherein: the sampling circuit comprises a sampling retainer and a voltage comparator, the output voltage and the input voltage of the sampling retainer are respectively connected with two input ends of the voltage comparator, the output end of the voltage comparator is connected with the input end of the amplifying circuit, and the output end of the amplifying circuit is connected with the input end of the voltage-frequency conversion circuit.
3. A high voltage insulating apparatus leakage current detection apparatus as claimed in claim 1 or 2, characterised by: the number of the leakage current signal extraction modules is multiple, the photoelectric isolation circuit comprises a plurality of optical fiber channels, a multi-channel selection switch is arranged on the host, each optical fiber channel is connected with one leakage current signal extraction module, and the photoelectric isolation circuit is connected with the frequency acquisition circuit through the multi-channel selection switch.
4. A high voltage insulating apparatus leakage current detection apparatus as claimed in claim 1 or 2, characterised by: the voltage-frequency conversion circuit comprises a voltage-frequency conversion chip, the input end of the voltage-frequency conversion chip is connected with the output end of the amplifying circuit, and the output end of the voltage-frequency conversion chip is connected with the light emitting diode of the photoelectric isolation circuit.
5. A high voltage insulating apparatus leakage current detection apparatus as claimed in claim 1 or 2, characterised by: the host further includes a communication circuit, a storage circuit, and a display device.
6. A high voltage insulating apparatus leakage current detection apparatus as claimed in claim 1 or 2, characterised by: and two ends of the sampling resistor are connected with a protection circuit in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121446558.4U CN215728417U (en) | 2021-06-28 | 2021-06-28 | Leakage current detection device for high-voltage insulation equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121446558.4U CN215728417U (en) | 2021-06-28 | 2021-06-28 | Leakage current detection device for high-voltage insulation equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215728417U true CN215728417U (en) | 2022-02-01 |
Family
ID=80045493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121446558.4U Expired - Fee Related CN215728417U (en) | 2021-06-28 | 2021-06-28 | Leakage current detection device for high-voltage insulation equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215728417U (en) |
-
2021
- 2021-06-28 CN CN202121446558.4U patent/CN215728417U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106645865B (en) | Device for measuring corona current of high-voltage transmission line | |
| CN102841301A (en) | Photovoltaic assembly monitoring system | |
| CN105527549A (en) | Partial discharge data collection circuit and detection system | |
| CN101408581A (en) | Cable wire break detection alarming device | |
| CN215728417U (en) | Leakage current detection device for high-voltage insulation equipment | |
| CN103412237B (en) | Intelligent tester for transformer coil turn-to-turn short circuit | |
| CN108333485A (en) | A kind of partial discharge of switchgear monitoring system | |
| CN201255757Y (en) | Electric cable break detecting alarm | |
| CN101777936A (en) | Surge immunity test method of high-speed signal wire | |
| CN204794059U (en) | Protection circuit of analog input port | |
| CN110162450A (en) | A kind of IT phenomenon of the failure feedback system | |
| CN204101619U (en) | A kind of for the superpotential monitoring device of GIS lightning ingress | |
| CN203203611U (en) | Quasi-distributed high voltage transmission line optical fiber monitoring network | |
| CN212159921U (en) | Transient overvoltage and overcurrent monitoring device | |
| CN202903962U (en) | Photovoltaic component monitoring system | |
| CN107677880A (en) | A kind of overvoltage intelligent identifying system based on the monitoring of leakage conductor tail current | |
| CN204028205U (en) | A kind of polarization-depolarization current pick-up unit for crosslinked polyethylene midium voltage cable | |
| CN202797953U (en) | Power management unit (PMU) with lightning stroke number detection function | |
| CN203772980U (en) | Wiring structure used for detecting passive switch signal | |
| CN212723177U (en) | Device is discerned to overhead line and mixed transmission line trouble source of underground cable | |
| CN202957660U (en) | Passive wireless transmission system | |
| CN203535235U (en) | Fragment position signal picking device | |
| CN202676780U (en) | Cvt transient overvoltage sampling device | |
| CN204631121U (en) | A kind of current sensing means for high-voltage cascade type current transformer | |
| CN208971510U (en) | The low cost transmitting-receiving timesharing of wireless communication system switches switching circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220201 |