CN111781551A - Protection circuit of pulse calibrator is put in office - Google Patents
Protection circuit of pulse calibrator is put in office Download PDFInfo
- Publication number
- CN111781551A CN111781551A CN202010738967.5A CN202010738967A CN111781551A CN 111781551 A CN111781551 A CN 111781551A CN 202010738967 A CN202010738967 A CN 202010738967A CN 111781551 A CN111781551 A CN 111781551A
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- Prior art keywords
- pulse
- pulse output
- inductor
- output circuit
- calibrator
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- 239000003990 capacitor Substances 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Classifications
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Tests Of Electronic Circuits (AREA)
Abstract
The invention discloses a protection circuit of a partial discharge pulse calibrator. The invention comprises a grounding inductance module and a pulse output circuit; one end of an inductor L is grounded through a grounding inductor module, and the other end of the inductor L is connected with one end of a capacitor C in the pulse output circuit and then connected to the pulse output end; the other end of the capacitor C is connected with a pulse input signal. The parameters of the inductance L are determined according to the capacitance C in the actual pulse output circuit. The invention prevents the potential safety hazard problem of high voltage at the moment of contact when the pulse calibrator and the tester calibrate the pulse of unknown power equipment.
Description
Technical Field
The invention relates to the technical field of high voltage detection, in particular to a protection circuit of a partial discharge pulse calibrator.
Background
In the partial discharge test, a calibration pulse generator is generally used to inject a pulse signal between the high-voltage terminal and the ground terminal of the power equipment in order to calibrate the whole test loop. In the power failure detection of power equipment such as a transformer, because the equipment grounding is unreliable, induced voltage can be generated, when the equipment is subjected to pulse calibration, the condition of damaging the pulse calibrator can occur, certain potential safety hazards are brought to the pulse calibrator and testing personnel, and therefore the design of the protection circuit suitable for the pulse calibrator during the partial discharge detection has great significance.
Disclosure of Invention
The invention provides a protection circuit of a partial discharge pulse calibrator aiming at the defects of the prior art.
The protection circuit comprises a grounding inductance module and a pulse output circuit;
the grounding inductor module grounds one end of an inductor L, and the other end of the inductor L is connected with one end of a capacitor C in the pulse output circuit and then is connected to the pulse output end; the other end of the capacitor C is connected with a pulse input signal.
The parameters of the inductance L are determined according to the capacitance C in the actual pulse output circuit, and the following principles are followed:
wherein f is the lower limit frequency set during working, and C is the capacitance in the actual pulse output circuit;
the benefits produced by the invention are as follows:
the invention provides a protection circuit of a partial discharge pulse calibrator, which prevents the potential safety hazard problem of high voltage at the moment of contact when the pulse calibrator and a tester calibrate the pulse of unknown power equipment.
Drawings
Fig. 1 is a schematic diagram of a protection circuit of a partial discharge pulse calibrator;
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1, a protection circuit of an partial discharge pulse calibrator includes a ground inductor circuit, wherein one end of a ground inductor L is grounded, and the other end of the ground inductor L is serially connected to a pulse output circuit, and the pulse output circuit includes a pulse input signal source, a capacitor C and a pulse output end; the pulse input signal source is a non-power output voltage U during pulse calibration, the voltage selection of 0-10V gears can be met, and the capacitor C can be adjusted to meet the adjustment of the size of the grounding inductor according to the experimental requirement; the pulse output end is a contact device and is used for contacting the power equipment needing pulse calibration;
as shown in fig. 1, one end of a capacitor C is connected to a pulse input signal source to output a charge q required for calibration, the other end is connected to an inductor L in a pulse calibration protection circuit and is connected to a pulse output end, one end of a grounded inductor L is grounded, and the other end is serially connected between the capacitor C and the pulse output end;
the calibration charge amount q satisfies the formula: q is UC; wherein U is a calibration voltage pulse, and C is a capacitor;
the parameters of the inductance L are determined according to the coupling capacitance C in the actual pulse output circuit, and the following principles are followed:
wherein f is the lower limit frequency set during working, and C is the capacitance in the actual pulse output circuit;
when the electric equipment is subjected to pulse calibration on site, the pulse output end is contacted with the electric equipment needing pulse calibration, and the inductive high voltage of kilovolt which possibly appears at the calibration contact point at the moment can form a loop ground through the protective inductance circuit, so that a tester and a calibration instrument are protected. The test loop can be calibrated by adjusting the pulse input signal source to output the pulse signal corresponding to the pulse charge quantity and injecting the pulse signal into the two ends of the tested object.
Claims (2)
1. A protection circuit of a partial discharge pulse calibrator is characterized by comprising a grounding inductance module and a pulse output circuit;
the grounding inductor module grounds one end of an inductor L, and the other end of the inductor L is connected with one end of a capacitor C in the pulse output circuit and then is connected to the pulse output end; the other end of the capacitor C is connected with a pulse input signal.
2. The protection circuit of claim 1, wherein the parameter of the inductance L is determined according to the capacitance C in the actual pulse output circuit, following the following principle:
wherein f is the lower limit frequency set during working, and C is the capacitance in the actual pulse output circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010738967.5A CN111781551A (en) | 2020-07-28 | 2020-07-28 | Protection circuit of pulse calibrator is put in office |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010738967.5A CN111781551A (en) | 2020-07-28 | 2020-07-28 | Protection circuit of pulse calibrator is put in office |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111781551A true CN111781551A (en) | 2020-10-16 |
Family
ID=72766072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010738967.5A Pending CN111781551A (en) | 2020-07-28 | 2020-07-28 | Protection circuit of pulse calibrator is put in office |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111781551A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201429647Y (en) * | 2009-08-11 | 2010-03-24 | 惠州市龙鼎盛电力科技有限公司 | Triphase electronic multifunction electric meter |
| KR20130113643A (en) * | 2012-04-06 | 2013-10-16 | 최대규 | Resonant sensor and apparatus for correcting surface deviation using the same |
| CN106559104A (en) * | 2015-09-21 | 2017-04-05 | 中国航天科工集团第四研究院指挥自动化技术研发与应用中心 | A kind of portable covered wire simulates box |
| CN206759047U (en) * | 2017-02-15 | 2017-12-15 | 广州视源电子科技股份有限公司 | A kind of RF joints lightning prevention circuit |
| CN207743689U (en) * | 2017-12-12 | 2018-08-17 | 四川升华电源科技有限公司 | Pulse signal protects circuit and output of pulse signal device |
| CN209446685U (en) * | 2018-12-06 | 2019-09-27 | 郑州云海信息技术有限公司 | A kind of system for eliminating electrical fast transient (eft) interference |
-
2020
- 2020-07-28 CN CN202010738967.5A patent/CN111781551A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201429647Y (en) * | 2009-08-11 | 2010-03-24 | 惠州市龙鼎盛电力科技有限公司 | Triphase electronic multifunction electric meter |
| KR20130113643A (en) * | 2012-04-06 | 2013-10-16 | 최대규 | Resonant sensor and apparatus for correcting surface deviation using the same |
| CN106559104A (en) * | 2015-09-21 | 2017-04-05 | 中国航天科工集团第四研究院指挥自动化技术研发与应用中心 | A kind of portable covered wire simulates box |
| CN206759047U (en) * | 2017-02-15 | 2017-12-15 | 广州视源电子科技股份有限公司 | A kind of RF joints lightning prevention circuit |
| CN207743689U (en) * | 2017-12-12 | 2018-08-17 | 四川升华电源科技有限公司 | Pulse signal protects circuit and output of pulse signal device |
| CN209446685U (en) * | 2018-12-06 | 2019-09-27 | 郑州云海信息技术有限公司 | A kind of system for eliminating electrical fast transient (eft) interference |
Non-Patent Citations (2)
| Title |
|---|
| 徐晓森 等: "《电工基础》", 30 June 1989, 中国铁道出版社 * |
| 邹玲 等: "《电路理论》", 31 August 2009, 华中科技大学出版社 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201016 |
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| RJ01 | Rejection of invention patent application after publication |