CN104062508A - Live detection auxiliary device for dielectric loss of voltage transformer - Google Patents
Live detection auxiliary device for dielectric loss of voltage transformer Download PDFInfo
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- CN104062508A CN104062508A CN201410280065.6A CN201410280065A CN104062508A CN 104062508 A CN104062508 A CN 104062508A CN 201410280065 A CN201410280065 A CN 201410280065A CN 104062508 A CN104062508 A CN 104062508A
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- voltage transformer
- dielectric loss
- signal
- chromacoder
- voltage
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Abstract
The invention discloses a live detection auxiliary device for the dielectric loss of a voltage transformer. The live detection auxiliary device for the dielectric loss of the voltage transformer comprises a small-sized mutual inductor, signal converting devices, a signal amplifier and a protective portion. The small-sized mutual inductor is installed on an earthed down lead of an end screen of the voltage transformer and extracts current signals. The signal converting devices convert the extracted current signals into voltage signals. The two ends of the signal amplifier are connected to the two ends of the signal converting devices. The protective portion comprises a discharge gap and a rapidly switched-on diode. The two ends of the discharge gap are connected to the two ends of the signal converting devices. The rapidly switched-on diode is connected to the two ends of the signal converting devices. A shell of the live detection auxiliary device for the dielectric loss of the voltage transformer is connected with the GND end. According to the live detection auxiliary device for the dielectric loss of the voltage transformer, the small-sized mutual inductor extracts the current signals on the earthed down lead of the end screen of the voltage transformer, the signal converting devices convert the extracted current signals into the voltage signals, and the voltage signals are amplified by the digital signal amplifier; in this way, the output signals are enhanced, signal phase shift is small, and a reliable signal source is provided for measurement of the dielectric loss of the voltage transformer.
Description
Technical field
The invention belongs to grid equipment state inspection field, relate in particular to a kind of voltage transformer (VT) dielectric loss band electro-detection servicing unit.
Background technology
In recent years the development General Promotion of charged detection technique basic data quality and expanded Data Source, for capacitive voltage transformer (VT), dielectric dissipation factor detect for apparatus insulated entirety make moist, the defect such as aging, insulation breath electric discharge can be sensitive reflects, it is the important test item of equipment, therefore can significantly reduce the power failure of voltage transformer (VT) with electro-detection dielectric loss, do not need to have a power failure, can grasp flexibly equipment state, discovering device hidden danger and defect in time, work efficiency is higher, reduces largely interruption maintenance cost.But voltage transformer (VT) band electro-detection need to be passed through bottom shielding of bushing obtaining current signal, but cover pipe insulation is equivalent to a string concentric column capacitor, outermost one deck (end shield) is drawn ground connection by small casing, once there is end shield imperfect earth phenomenon, will cause end shield to form over the ground electric capacity, this electric capacity is far smaller than the electric capacity of sleeve pipe itself, according to capacitances in series principle, very high suspended voltage will be formed between end shield and ground, cause end shield to discharge over the ground, serious may cause bushing explosion, brings threat to personal safety and electrical network reliability service.
Therefore to capacitive voltage mutual inductor be with electro-detection need to end shield downlead increase servicing unit, with ensure test safety and the not impact of tested person of operational outfit, operational outfit is played a protective role.
Summary of the invention
The object of the present invention is to provide a kind of voltage transformer (VT) dielectric loss band electro-detection servicing unit, be intended to ensure safety and the not impact of tested person of operational outfit of capacitive voltage transformer (VT) test.
The present invention is achieved in that a kind of voltage transformer (VT) dielectric loss band electro-detection servicing unit comprises small-sized mutual inductor, chromacoder, signal amplifier, protection part; Described small-sized mutual inductor is arranged on voltage transformer (VT) end shield down conductor and extracts current signal; chromacoder converts the current signal of extraction to voltage signal; signal amplifier two ends are connected on chromacoder two ends; protection part comprises discharging gap and fast conducting diode; discharging gap two ends are connected on chromacoder two ends; fast conducting diode is connected on chromacoder two ends; connection terminal two ends are connected on chromacoder two ends, the outer shell joint GND end of voltage transformer (VT) dielectric loss band electro-detection servicing unit.
The present invention extracts current signal by small-sized mutual inductor on voltage transformer (VT) end shield down conductor; chromacoder converts the current signal of extraction to voltage signal; amplify through digital amplifier; protection part comprises small-sized discharging gap and fast conducting diode; not only strengthen the signal of output; and signal phase shift is little, reliable signal source is provided to the dielectric loss measurement of voltage transformer (VT).
Brief description of the drawings
Fig. 1 is the circuit diagram of the voltage transformer (VT) dielectric loss band electro-detection servicing unit that provides of the embodiment of the present invention;
In figure: 1, voltage transformer (VT); 2, small-sized mutual inductor; 3, chromacoder; 4, signal amplifier; 5, discharging gap; 6, fast conducting diode; 7, connection terminal; 8, shell.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the structure of voltage transformer (VT) dielectric loss band electro-detection servicing unit of the present invention, as shown in the figure, the present invention is achieved in that a kind of voltage transformer (VT) dielectric loss band electro-detection servicing unit comprises small-sized mutual inductor 2, chromacoder 3, signal amplifier 4, protection part; Described small-sized mutual inductor 2 is arranged on voltage transformer (VT) 1 end shield down conductor and extracts current signal; chromacoder 3 converts the current signal of extraction to voltage signal; 4 liang of ends of signal amplifier are connected on chromacoder 3 two ends; protection part comprises discharging gap 5 and fast conducting diode 6; 5 liang of ends of discharging gap are connected on chromacoder 3 two ends; fast conducting diode 6 is connected on chromacoder 3 two ends; 7 liang of ends of connection terminal are connected on chromacoder 3 two ends, and the shell 8 of voltage transformer (VT) dielectric loss band electro-detection servicing unit connects GND end.
When test, the small-sized mutual inductor 2 first this device front end being extracted for current signal is connected on voltage transformer (VT) 1 end shield down conductor, measuring equipment is connected on the connection terminal 7 of this device, measures.
The present invention extracts current signal by small-sized mutual inductor 2 on voltage transformer (VT) end shield down conductor; chromacoder 3 converts the current signal of extraction to voltage signal; amplify through digital amplifier 4; protection part comprises small-sized discharging gap 5 and fast conducting diode 6; not only strengthen the signal of output; and signal phase shift is little, reliable signal source is provided to the dielectric loss measurement of voltage transformer (VT).
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendments that performing creative labour can make or distortion still within protection scope of the present invention.
Claims (1)
1. a voltage transformer (VT) dielectric loss band electro-detection servicing unit, is characterized in that, described voltage transformer (VT) dielectric loss band electro-detection servicing unit comprises small-sized mutual inductor, chromacoder, signal amplifier, protection part; Described small-sized mutual inductor is arranged on voltage transformer (VT) end shield down conductor and extracts current signal; chromacoder converts the current signal of extraction to voltage signal; signal amplifier two ends are connected on chromacoder two ends; protection part comprises discharging gap and fast conducting diode; discharging gap two ends are connected on chromacoder two ends; fast conducting diode is connected on chromacoder two ends; connection terminal two ends are connected on chromacoder two ends, the outer shell joint GND end of voltage transformer (VT) dielectric loss band electro-detection servicing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410280065.6A CN104062508A (en) | 2014-06-20 | 2014-06-20 | Live detection auxiliary device for dielectric loss of voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410280065.6A CN104062508A (en) | 2014-06-20 | 2014-06-20 | Live detection auxiliary device for dielectric loss of voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104062508A true CN104062508A (en) | 2014-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410280065.6A Pending CN104062508A (en) | 2014-06-20 | 2014-06-20 | Live detection auxiliary device for dielectric loss of voltage transformer |
Country Status (1)
| Country | Link |
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| CN (1) | CN104062508A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02208574A (en) * | 1989-02-09 | 1990-08-20 | Shikoku Sogo Kenkyusho:Kk | Method for measuring dielectric loss of cable |
| CN1793990A (en) * | 2005-12-29 | 2006-06-28 | 西安电子科技大学 | On-line monitoring system for capacitor type equipment dielectricless |
| CN202837407U (en) * | 2012-05-31 | 2013-03-27 | 保定天腾电气有限公司 | Capacitive equipment and lightning arrester medium loss live line measuring device |
| CN103063931A (en) * | 2013-01-05 | 2013-04-24 | 江苏省电力公司电力科学研究院 | 500 kV constant-voltage transformer (CVT) multiple-project dielectric loss testing system and testing method thereof |
| CN203216999U (en) * | 2013-04-19 | 2013-09-25 | 保定市力兴电子设备有限公司 | Capacitive equipment dielectric loss live line measurement sampling device |
-
2014
- 2014-06-20 CN CN201410280065.6A patent/CN104062508A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02208574A (en) * | 1989-02-09 | 1990-08-20 | Shikoku Sogo Kenkyusho:Kk | Method for measuring dielectric loss of cable |
| CN1793990A (en) * | 2005-12-29 | 2006-06-28 | 西安电子科技大学 | On-line monitoring system for capacitor type equipment dielectricless |
| CN202837407U (en) * | 2012-05-31 | 2013-03-27 | 保定天腾电气有限公司 | Capacitive equipment and lightning arrester medium loss live line measuring device |
| CN103063931A (en) * | 2013-01-05 | 2013-04-24 | 江苏省电力公司电力科学研究院 | 500 kV constant-voltage transformer (CVT) multiple-project dielectric loss testing system and testing method thereof |
| CN203216999U (en) * | 2013-04-19 | 2013-09-25 | 保定市力兴电子设备有限公司 | Capacitive equipment dielectric loss live line measurement sampling device |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 300010 Tianjin city Hebei District Wujing Road No. 39 Applicant after: State Grid Corporation of China Applicant after: State Grid Tianjin Electric Power Company Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: State Grid Tianjin Electric Power Company |
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| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140924 |
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| RJ01 | Rejection of invention patent application after publication |