CN102508136A - Insulation monitoring method for IT (Isolation Terre) electric system with neutral conductor - Google Patents
Insulation monitoring method for IT (Isolation Terre) electric system with neutral conductor Download PDFInfo
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- CN102508136A CN102508136A CN2011104061903A CN201110406190A CN102508136A CN 102508136 A CN102508136 A CN 102508136A CN 2011104061903 A CN2011104061903 A CN 2011104061903A CN 201110406190 A CN201110406190 A CN 201110406190A CN 102508136 A CN102508136 A CN 102508136A
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- insulation
- neutral conductor
- monitoring method
- electric system
- direct current
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Abstract
The invention relates to an insulation monitoring method for an IT (Isolation Terre) electric system insulation with a neutral conductor. The monitoring method comprises the following steps of: bunching a direct current signal source DC (direct current) and a voltage V on the neutral point of a distribution transformer, and connecting a sampling resistor R in series; and when measuring that a direct current I= of the serial sampling resistor R exists and is greater than one threshold, proving that the insulation of one phase is subjected to deterioration, and reacting the variation of the serial direct current I=. According to the invention, a simple method can be used for monitoring an insulation fault on the neutral conductor of an IT electric system, and the specific resistance value of an earthing resistor is obtained.
Description
Technical field
The present invention relates to a kind of insulated monitoring method, utilize to the method for neutral conductor injection dc signal source to come system is carried out the method that the IT power system insulation is monitored.
Technical background
IT electric system (electric power system commonly used that refers to no center conductor in the power supply industry) must be installed insulation monitoring and warning device, is used for the early warning of earth fault for the first time in the realization system.The insulating monitoring product that IT electric system at present is relevant all can only be monitored the insulation degradation on the phase conductor, does not still have producer and declares and can monitor the insulation fault on the IT electric system neutral conductor.
Summary of the invention
The objective of the invention is, propose a kind of method of coming system is carried out insulating monitoring that adopts to the method for neutral conductor injection dc signal source.
Technical scheme of the present invention is, allots the IT power system insulation monitoring method of neutral conductor, seals in a dc signal source DC at substation transformer neutral point place, and voltage is V, and the sampling resistor R that connects, and measures the sampling resistor R DC current I of series connection
=Existence and greater than a certain threshold value, then prove the insulation generation deterioration of a certain phase, be reflected at the series direct current electric current I
=Variation.The IT electric system just often, the three-phase conductor on every road and neutral conductor insulation resistance resistance R over the ground
A, R
B, R
C, R
NAll trend towards infinity, when the insulation generation deterioration of a certain phase, this relatively the insulation resistance resistance can decline to a great extent, can produce a direct current fault current I in the system
=, the terminal voltage of sampling resistor R can raise.Terminal voltage through monitoring R can be monitored the insulation degradation situation in the system, and can draw concrete stake resistance resistance through calculating the proportionate relationship of R and fault place stake resistance.
I
==V/（R+R
N），R
N=（V-?R?I
=?）/?I
=
DC current I
=Existence and greater than a certain threshold value, with the framework of IT electric system certain relation is arranged.Generally, can select 10-15mA for use greater than a certain threshold value.
The invention has the beneficial effects as follows: the present invention can monitor the insulation fault on the IT electric system neutral conductor with simple method, and draws concrete stake resistance resistance.
Description of drawings
Fig. 1 insulating monitoring system architecture schematic diagram.
Embodiment
As shown in the figure, allot the IT power system insulation monitoring method of neutral conductor, the place seals in a dc signal source DC at IT electric system substation transformer neutral point, and voltage is V, and the sampling resistor R that connects, and carries out current measurement on the sampling resistor; Suppose on the neutral conductor N insulation damages to have taken place, R
NDecline to a great extent, direct current injects signal along neutral conductor insulation against ground resistance R
N, can constitute the closed-loop path, DC current I
=Sharp increase when the pressure drop on the sampling resistor R surpasses setting valve, can trigger sound and light signal and report to the police, and through calculating, shows R in the acquisition system based on industrial computer or single-chip microcomputer structure
NSize.DC current I of the present invention
=Existence and greater than a certain threshold value, with the framework of IT electric system certain relation is arranged.Generally, can select 10-15mA for use greater than a certain threshold value.Can start warning system during greater than this threshold value.
The present invention program can not only monitor three insulation situation on the phase conductor, also can monitor the insulation situation on the neutral conductor simultaneously.
Claims (3)
1. allot the IT power system insulation monitoring method of neutral conductor, it is characterized in that sealing in a dc signal source DC at substation transformer neutral point place, voltage is V, and the sampling resistor R that connects, and measures the sampling resistor R DC current I of series connection
=Existence and greater than a certain threshold value, then prove the insulation generation deterioration of a certain phase, be reflected at the series direct current electric current I
=Variation.
2. the IT power system insulation monitoring method of allotting neutral conductor according to claim 1 is characterized in that the insulation generation deterioration resistance of three-phase conductor and neutral conductor is measured R
N=(V-R I
=)/I
=
3. the IT power system insulation monitoring method of allotting neutral conductor according to claim 1 is characterized in that DC current I
=Greater than a threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104061903A CN102508136A (en) | 2011-12-09 | 2011-12-09 | Insulation monitoring method for IT (Isolation Terre) electric system with neutral conductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104061903A CN102508136A (en) | 2011-12-09 | 2011-12-09 | Insulation monitoring method for IT (Isolation Terre) electric system with neutral conductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102508136A true CN102508136A (en) | 2012-06-20 |
Family
ID=46220241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104061903A Pending CN102508136A (en) | 2011-12-09 | 2011-12-09 | Insulation monitoring method for IT (Isolation Terre) electric system with neutral conductor |
Country Status (1)
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|---|---|
| CN (1) | CN102508136A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852643A (en) * | 2012-12-04 | 2014-06-11 | 本德尔有限两合公司 | Insulation monitoring device with measuring circuit interruption |
| CN103884930A (en) * | 2014-03-04 | 2014-06-25 | 王金全 | Full bridge uncontrolled rectifier fault diagnosis method based on insulation monitoring |
| CN104007396A (en) * | 2014-05-19 | 2014-08-27 | 广西电网公司电力科学研究院 | Device and method for searching for loop channeling electric fault in direct current systems |
| CN106443384A (en) * | 2016-10-13 | 2017-02-22 | 湖南工业大学 | Single-phase AC IT system insulation monitoring apparatus |
| CN106501639A (en) * | 2016-10-13 | 2017-03-15 | 湖南工业大学 | Three-phase and four-line IT system electric energy quality monitoring and insulation fault line selection and location method |
| CN106546842A (en) * | 2016-10-13 | 2017-03-29 | 湖南工业大学 | The micro-capacitance sensor IT system quality of power supply and insulating properties monitoring device |
| CN109142932A (en) * | 2018-09-11 | 2019-01-04 | 江苏镇安欣润电力科技有限公司 | A kind of monitoring of isolated neutral power supply system and protection system |
| CN109557400A (en) * | 2016-10-13 | 2019-04-02 | 湖南工业大学 | Micro-capacitance sensor three-phase IT system power quality and insulation performance online test method |
| CN110632469A (en) * | 2019-09-10 | 2019-12-31 | 江苏镇安电力设备有限公司 | Low-frequency alternating current injection insulation performance online monitoring system and detection method for ITN system |
| CN113097977A (en) * | 2014-03-05 | 2021-07-09 | 本德尔有限两合公司 | Method and apparatus for selective insulation monitoring within ungrounded IT power supply systems |
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| EP0864873B1 (en) * | 1997-03-12 | 2003-11-19 | Siemens Aktiengesellschaft | Procedure for determining the grounding resistance and house wiring adapted for same |
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2011
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Patent Citations (4)
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|---|---|---|---|---|
| EP0864873B1 (en) * | 1997-03-12 | 2003-11-19 | Siemens Aktiengesellschaft | Procedure for determining the grounding resistance and house wiring adapted for same |
| JP2005062124A (en) * | 2003-08-20 | 2005-03-10 | Chugoku Electric Power Co Inc:The | Diagnostic system and method for insulation deterioration region in electric wire or cable |
| KR20070024362A (en) * | 2006-08-16 | 2007-03-02 | 김보경 | Low voltage on-line insulation monitoring system |
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Non-Patent Citations (1)
| Title |
|---|
| 王巍等: "IT系统配出中性导体问题简析", 《建筑电气》 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852643A (en) * | 2012-12-04 | 2014-06-11 | 本德尔有限两合公司 | Insulation monitoring device with measuring circuit interruption |
| CN103884930A (en) * | 2014-03-04 | 2014-06-25 | 王金全 | Full bridge uncontrolled rectifier fault diagnosis method based on insulation monitoring |
| CN113097977A (en) * | 2014-03-05 | 2021-07-09 | 本德尔有限两合公司 | Method and apparatus for selective insulation monitoring within ungrounded IT power supply systems |
| CN104007396A (en) * | 2014-05-19 | 2014-08-27 | 广西电网公司电力科学研究院 | Device and method for searching for loop channeling electric fault in direct current systems |
| CN104007396B (en) * | 2014-05-19 | 2017-01-25 | 广西电网公司电力科学研究院 | Device and method for searching for loop channeling electric fault in direct current systems |
| CN106443384A (en) * | 2016-10-13 | 2017-02-22 | 湖南工业大学 | Single-phase AC IT system insulation monitoring apparatus |
| CN106501639A (en) * | 2016-10-13 | 2017-03-15 | 湖南工业大学 | Three-phase and four-line IT system electric energy quality monitoring and insulation fault line selection and location method |
| CN106546842A (en) * | 2016-10-13 | 2017-03-29 | 湖南工业大学 | The micro-capacitance sensor IT system quality of power supply and insulating properties monitoring device |
| CN106501639B (en) * | 2016-10-13 | 2019-03-01 | 湖南工业大学 | Three-phase and four-line IT system electric energy quality monitoring and insulation fault line selection and location method |
| CN109557400A (en) * | 2016-10-13 | 2019-04-02 | 湖南工业大学 | Micro-capacitance sensor three-phase IT system power quality and insulation performance online test method |
| CN109142932A (en) * | 2018-09-11 | 2019-01-04 | 江苏镇安欣润电力科技有限公司 | A kind of monitoring of isolated neutral power supply system and protection system |
| CN110632469A (en) * | 2019-09-10 | 2019-12-31 | 江苏镇安电力设备有限公司 | Low-frequency alternating current injection insulation performance online monitoring system and detection method for ITN system |
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Application publication date: 20120620 |