CN202854210U - Device used for on-line detection of voltage of insulator of power transmission line - Google Patents
Device used for on-line detection of voltage of insulator of power transmission line Download PDFInfo
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- CN202854210U CN202854210U CN 201220458079 CN201220458079U CN202854210U CN 202854210 U CN202854210 U CN 202854210U CN 201220458079 CN201220458079 CN 201220458079 CN 201220458079 U CN201220458079 U CN 201220458079U CN 202854210 U CN202854210 U CN 202854210U
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Abstract
The utility model relates to a device used for the on-line detection of the voltage of the insulator of a power transmission line, which comprises a voltage sensing pole plate, a connecting rod, a sampling resistor and a voltage measuring unit. A capacitor is formed by the voltage sensing pole plate together with an insulator pin fitting. One end of the connecting rod is connected with the voltage sensing pole plate, and the other end of the connecting rod is connected with the sampling resistor through a signal line. In this way, the sampling resistor is connected in series with a capacitor. The voltage measuring unit is connected with the sampling resistor to measure the magnitude of voltage across the sampling resistor. By means of the device, the position of a zero-resistance insulator in an insulator string can be specifically detected by the monitoring personnel only according to judging results, so that the periodical maintenance mode can be completely converted into the real-time monitoring mode. Therefore, the operation intensity of examining and repairing the state of the line is greatly reduced, and both the operation efficiency and the detection accuracy are improved.
Description
Technical field
The utility model relates to a kind of circuit checker, relates in particular to a kind of device that detects insulator voltage.
Background technology
Exchange aerial power transmission line insulator chain voltage skewness except outside the Pass having with the insulator chain ground capacitance, to high-voltage conducting wires electric capacity and insulator selfcapacity, also with in the string whether exist deteriorated insulator relevant.If there is deteriorated insulator in the electric power line pole tower insulator chain, in case there is superpotential to occur, will cause the insulator internal breakdown, porcelain completely loses insulating capacity, thereby produces faulty insulator.The transient short-circuit current that thunderbolt and pollution flashover produce may cause the thermal explosion of crossing of faulty insulator when serious, thereby produces the string accident, and the transmission line of electricity safe operation is consisted of great threat.
A lot of experiments and theoretical research are verified, the voltage of normal insulation substring is distributed as incomplete saddle-shape, the voltage that namely bears near wire place insulator is the highest, be about the 1.7-3.0 of earth terminal voltage that insulator bears doubly, and the voltage that insulator chain pars intermedia branch bears is minimum.When the poor insulation period of the day from 11 p.m. to 1 a.m occurring, the voltage on the insulator chain will redistribute, and as the actual voltage voltage on the insulator chain that distributes when normal that records is distributed and makes comparisons, be conducive to judge whether poor insulator exists.
According to the feature that the Ageing of Insulators reason and characteristics and faulty insulator present, produced the detecting instrument of various different mechanism, the detecting sensor of quantitative reference data especially can be provided for testing result.
Through the retrieval of prior art is found: it is a kind of based on pulse leakage stream detector that document number is that the Chinese patent of CN1782724 has been put down in writing, and this detector can draw quantitative measurement to insulator on-line operation situation.But its shortcoming is to need that before measurement the insulator chain spread voltage is had a qualitative estimation, and accuracy also is subjected to environmental factor (such as humidity, pollution level) and the impact of human factor larger.Can the measurement of accurate quantitative analysis be provided and help the comprehensive data of judging the Ageing of Insulators degree, particularly in the situation that may exist multi-disc to hang down null value in the insulator string, it is on the books that the surveying instrument that can quantitatively make zero resistance insulator sheet location is also never seen pertinent literature so far.
Summary of the invention
The purpose of this utility model provides a kind of device of online detection electric transmission line isolator voltage, utilize this device, the monitoring personnel only need just can specifically detect according to judged result the position of zero resistance insulator in the insulator chain, so that the work of prophylactic repair can be converted to the mode of Real-Time Monitoring fully, greatly reduce the working strength of line status maintenance, improved work efficiency and accuracy of detection.
The inventive concept of the technical program is: with in the insulator chain near the insulator of earth terminal as the supposition sensitive insulator, combine with the leakage current method, finish simultaneously on-line measurement, thereby obtain judging the quantitative comprehensive evaluation that has or not zero resistance insulator in this string, when namely an insulator string is without faulty insulator, the spread voltage of each insulator is called standard profile voltage, if the measuring voltage value of earth terminal insulator is higher than this standard profile voltage, whether the insulator chain that just can judge the place exists poor insulator.
According to above-mentioned purpose, the utility model provides a kind of device of online detection electric transmission line isolator voltage, and it comprises:
One voltage sensor pole plate, itself and insulator pin gold utensil form an electric capacity;
One connecting link, the one end is connected with the voltage sensor pole plate;
One sampling resistor, it is connected with the other end of connecting link by signal wire, so that sampling resistor is connected with capacitances in series;
One voltage measuring apparatus, it is connected with sampling resistor, to measure the magnitude of voltage on the sampling resistor.
Preferably, described connecting link is a curved support, and the one end is connected with the voltage sensor pole plate, and its other end is connected with signal wire.
Preferably, the end that curved support is connected with signal wire also is connected with an insulator and is connected and fixed assembly, and this insulator is connected and fixed assembly and comprises a circular connector, is fixed in insulator surface.
Preferably, circular connector comprises two semi-circular arcuate members that mutually are rotationally connected.
Preferably, the other end of curved support is connected on the semi-circular arcuate member that insulator is connected and fixed assembly by a bent plate, and the shape of this bent plate and the radian of semi-circular arcuate member are complementary.
Owing to having adopted technique scheme, whether the device of online detection electric transmission line isolator voltage described in the utility model only need to be higher than according to the measuring voltage value of earth terminal insulator standard profile voltage just can be judged the insulator chain at place and whether have poor insulator, then specifically detect the position of zero resistance insulator in the insulator chain according to this judged result, so that the work of prophylactic repair can be converted to the mode of Real-Time Monitoring fully, greatly reduce the working strength of line status maintenance, improved work efficiency and accuracy of detection.
Description of drawings
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the structural representation of the device of a kind of online detection electric transmission line isolator voltage among a kind of embodiment of the present utility model.
Fig. 2 is the structural representation of closure state after the device of a kind of online detection electric transmission line isolator voltage among a kind of embodiment of the present utility model is installed.
Fig. 3 is the structural representation of the device of a kind of online detection electric transmission line isolator voltage among a kind of embodiment of the present utility model open mode when not installing.
Reference numeral:
1. voltage sensor pole plate 2. curved support 3. sampling resistors 4. signal wires 5. voltage measuring apparatus 6. insulators 7. insulators are connected and fixed assembly 8. circular connectors 9. semi-circular arcuate member 10. screws
Embodiment
Be further described in detail below with reference to the insulator spread voltage on-line measurement sensor of Figure of description to a kind of transmission line of electricity described in the utility model.
As shown in Figure 1, the device of the online detection electric transmission line isolator voltage in the present embodiment comprises voltage sensor pole plate 1, and the bulb gold utensil of itself and insulator 6 forms an electric capacity; One end of curved support 2 is connected with voltage sensor pole plate 1, and its other end is connected with signal wire 4, and the end that this curved support 2 is connected with signal wire 4 also is connected with insulator and is connected and fixed assembly 7, in order to voltage sensor pole plate 1 is fixed on the insulator 6; Sampling resistor 3, it is connected with the other end of curved support 2 by signal wire 4, so that the capacitances in series of the bulb gold utensil formation that sampling resistor 3 and voltage sensor pole plate 1 are connected with insulator is connected; Voltage measuring apparatus 5 is connected with sampling resistor 3, to measure the magnitude of voltage on the sampling resistor 3.
As shown in Figures 2 and 3, in the present embodiment, insulator is connected and fixed assembly 7 and comprises circular connector 8, thereby circular connector 8 comprises the open and close of two semi-circular arcuate members that mutually are rotationally connected, 9 realization circular connectors 8, and circular connector 8 is fixed in the surface of insulator 6 by screw 10.
Adopt the device of above-mentioned online detection electric transmission line isolator voltage to carry out insulator voltage when measuring, the distance between the hardware ball-head of sensor plate 1 and insulator 6 is d, according to capacitance equation
Just can learn that sensor plate 1 and the capacitance C(S of the hardware ball-head formation electric capacity of insulator 6 represent the area of sensor plate, ε
0The expression air dielectric, the two is known quantity), basis then
Just can learn its impedance Z, then can record voltage on the sampling resistor 3 by voltage measuring apparatus 5, can obtain thus the distributed current I on the sampling resistor 3, in conjunction with distributed current value I, just obtain the actual magnitude of voltage U=IZ that bears of insulator.
Be noted that above enumerate only for specific embodiment of the utility model, obviously the utility model is not limited to above embodiment, and many similar variations are arranged thereupon.If those skilled in the art all should belong to protection domain of the present utility model from all distortion that the disclosed content of the utility model directly derives or associates.
Claims (5)
1. an online device that detects electric transmission line isolator voltage is characterized in that, comprising:
One voltage sensor pole plate, itself and insulator pin gold utensil form an electric capacity;
One connecting link, the one end is connected with described voltage sensor pole plate;
One sampling resistor, it is connected with the other end of described connecting link by signal wire, so that sampling resistor is connected with described capacitances in series;
One voltage measuring apparatus, it is connected with described sampling resistor, to measure the magnitude of voltage on the sampling resistor.
2. the device of online detection electric transmission line isolator voltage as claimed in claim 1 is characterized in that, described connecting link is a curved support, and the one end is connected with described voltage sensor pole plate, and its other end is connected with described signal wire.
3. the device of online detection electric transmission line isolator voltage as claimed in claim 2, it is characterized in that, the end that described curved support is connected with signal wire also is connected with an insulator and is connected and fixed assembly, and described insulator is connected and fixed assembly and comprises a circular connector, is fixed in insulator surface.
4. the device of online detection electric transmission line isolator voltage as claimed in claim 3 is characterized in that, described circular connector comprises two semi-circular arcuate members that mutually are rotationally connected.
5. the device of online detection electric transmission line isolator voltage as claimed in claim 4, it is characterized in that, the other end of described curved support is connected on the semi-circular arcuate member that insulator is connected and fixed assembly by a bent plate, and the shape of described bent plate and the radian of semi-circular arcuate member are complementary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220458079 CN202854210U (en) | 2012-09-10 | 2012-09-10 | Device used for on-line detection of voltage of insulator of power transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220458079 CN202854210U (en) | 2012-09-10 | 2012-09-10 | Device used for on-line detection of voltage of insulator of power transmission line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202854210U true CN202854210U (en) | 2013-04-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220458079 Expired - Fee Related CN202854210U (en) | 2012-09-10 | 2012-09-10 | Device used for on-line detection of voltage of insulator of power transmission line |
Country Status (1)
| Country | Link |
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| CN (1) | CN202854210U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510682A (en) * | 2016-03-04 | 2016-04-20 | 云南电网有限责任公司电力科学研究院 | Movable over-voltage monitoring device for transformer substations |
| CN108181496A (en) * | 2018-01-11 | 2018-06-19 | 国网山东省电力公司夏津县供电公司 | Electric power circuit insulator safety device |
| CN113376052A (en) * | 2021-05-20 | 2021-09-10 | 贵州电网有限责任公司 | Composite insulator core rod performance evaluation method |
| CN114062794A (en) * | 2021-10-27 | 2022-02-18 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Insulator surface electric field intensity measuring device and insulator system |
-
2012
- 2012-09-10 CN CN 201220458079 patent/CN202854210U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510682A (en) * | 2016-03-04 | 2016-04-20 | 云南电网有限责任公司电力科学研究院 | Movable over-voltage monitoring device for transformer substations |
| CN108181496A (en) * | 2018-01-11 | 2018-06-19 | 国网山东省电力公司夏津县供电公司 | Electric power circuit insulator safety device |
| CN113376052A (en) * | 2021-05-20 | 2021-09-10 | 贵州电网有限责任公司 | Composite insulator core rod performance evaluation method |
| CN114062794A (en) * | 2021-10-27 | 2022-02-18 | 中国南方电网有限责任公司超高压输电公司贵阳局 | Insulator surface electric field intensity measuring device and insulator system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130403 Termination date: 20140910 |
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| EXPY | Termination of patent right or utility model |