CN101241156A - Method for loading direct current mutual-inductor for applying to converter transformer bias magnet monitoring - Google Patents

Method for loading direct current mutual-inductor for applying to converter transformer bias magnet monitoring Download PDF

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Publication number
CN101241156A
CN101241156A CNA2007101956582A CN200710195658A CN101241156A CN 101241156 A CN101241156 A CN 101241156A CN A2007101956582 A CNA2007101956582 A CN A2007101956582A CN 200710195658 A CN200710195658 A CN 200710195658A CN 101241156 A CN101241156 A CN 101241156A
Authority
CN
China
Prior art keywords
transformer
current
converter transformer
converter power
converter
Prior art date
Application number
CNA2007101956582A
Other languages
Chinese (zh)
Inventor
常浩
石岩
韩伟
张民
Original Assignee
国网直流工程建设有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 国网直流工程建设有限公司 filed Critical 国网直流工程建设有限公司
Priority to CNA2007101956582A priority Critical patent/CN101241156A/en
Publication of CN101241156A publication Critical patent/CN101241156A/en

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Abstract

The present invention provides a method for inspecting DC bias of converter transformer by mounting DC current transformer on neutral point of converter transformer, which can measure DC current real value from neutral point of converter transformer to converter transformer and avoid iron heating caused by DC bias of converter transformer to reduce service life of converter transformer. According to saturation curve of converter transformer, the highest DC current amount is able to bear by transformer from neutral point of converter transformer to transformer is determined, DC bias grade of converter transformer is estimated exactly by DC current value measured by DC current transformer.

Description

Install DC current transformer additional and be applied to the new method that the change of current becomes the magnetic bias monitoring
Technical field
The present invention relates to the monitoring method of converter transformer DC magnetic bias electric current in the DC transmission system, monitor the method for converter power transformer neutral point direct current bias current specifically with DC current transformer with Hall coil.
Background technology
At present in the DC transmission engineering by DC power transmission line or constitute the flow cycle of DC current greatly.When getting flow cycle as DC current,, particularly work as electric current and can not enter crust deep part fast, then spread at ground surface because earthing pole is relatively more responsive to the conductive characteristic of geology soil by the earth.Face of land electric current forms potential difference (PD) in big scope, and on possible path, the face of land, produce electric current, operation produces adverse influence to power system device, produce DC current as transformer neutral point, make transformer magnetic bias occur, cause that transformer magnetic circuit is saturated, efficient reduces, so that damage transformer.
The monitoring method of converter power transformer magnetic bias is generally by installing AC current transformer additional at present, obtain the current value of the third harmonic that flows through change of current change neutral point by wave filter, the triple harmonic current value that provides according to transformer producer and the corresponding relation curve of DC component draw the DC current that flows through the converter power transformer neutral point, determine the direct current flow that passes through converter power transformer neutral point inflow transformer that the transformer maximum can tolerate according to the saturation curve of converter power transformer, judge with this whether converter power transformer magnetic bias takes place.
Adopt above-mentioned method to need converter power transformer producer that the corresponding relation curve of triple harmonic current value and DC component is provided, at present converter power transformer can only no-load running before dispatching from the factory, the corresponding relation curve of triple harmonic current value and DC component can only obtain by calculating according to the converter power transformer Differential Equation Model, because all characteristics when the converter power transformer model can not accurately be expressed the converter power transformer hanging net operation, thereby cause by the corresponding relation curve of the triple harmonic current value that calculates and DC component inaccurately, and then cause can not accurately judging the degree of converter power transformer generation magnetic bias.
Summary of the invention
The new method that the object of the present invention is to provide a kind of new converter power transformer magnetic bias to detect.Utilize DC current transformer to detect the direct current flow that passes through the converter power transformer neutral point, and then accurately judge the DC magnetic biasing degree of converter power transformer according to converter power transformer protection curve.
Description of drawings
Accompanying drawing 1 is illustrated in the system construction drawing that the converter power transformer neutral point installs DC transmission system after the DC current transformer additional.Wherein each Reference numeral is expressed as:
1. current conversion station ac bus; 2. converter power transformer; 3. the DC current transformer that installs additional of converter power transformer star winding neutral point; 4. converter valve; 5. smoothing reactor; 6. direct current is failed the wire system neutral ground utmost point; 7. DC power transmission line (not having DC power transmission line) for back-to-back DC power transmission system.
Embodiment
Install AC current transformer at employing additional at the converter power transformer neutral point and can not directly measure DC component, and the corresponding relation curve of triple harmonic current value and DC component is inaccurate, and then cause judging the degree of converter power transformer generation magnetic bias and the problem that exists, the present invention proposes and a kind ofly install DC current transformer method monitoring 3. flows into converter power transformer by the converter power transformer neutral point DC magnetic bias current additional at the converter power transformer neutral point.Employing has the DC current transformer of Hall coil can carry out non-cpntact measurement to DC current, advantage such as have that precision height, the linearity are good, bandwidth, response are fast, good reliability, security are good.In engineering is used, be convenient to very much implement, only the AC current transformer that install additional at the converter power transformer neutral point position usually directly need be replaced to the DC current transformer with Hall coil and just can realize, can not increase new working procedure.
Adopt DC current transformer to measure the DC current that flows into converter power transformer by the converter power transformer neutral point; the DC quantity value of measuring is accurate; and DC current transformer secondary side waveform truly reflects the waveform of primary current; according to the DC current values of measuring, just can accurately judge converter power transformer in conjunction with the protection curve of converter power transformer and get the DC magnetic biasing degree.

Claims (3)

1, the new method of monitoring converter power transformer magnetic bias in a kind of DC transmission system is characterized in that: utilize DC current transformer monitoring converter transformer DC magnetic bias electric current.
2, the method for claim 1 is characterized in that: DC current transformer is installed in converter power transformer star side neutral ground point place.
3, the method for claim 1, its feature is at the current transformer of DC current transformer for the closed loop compensation formula of employing Hall coil.
CNA2007101956582A 2007-12-05 2007-12-05 Method for loading direct current mutual-inductor for applying to converter transformer bias magnet monitoring CN101241156A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2007101956582A CN101241156A (en) 2007-12-05 2007-12-05 Method for loading direct current mutual-inductor for applying to converter transformer bias magnet monitoring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2007101956582A CN101241156A (en) 2007-12-05 2007-12-05 Method for loading direct current mutual-inductor for applying to converter transformer bias magnet monitoring

Publications (1)

Publication Number Publication Date
CN101241156A true CN101241156A (en) 2008-08-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2007101956582A CN101241156A (en) 2007-12-05 2007-12-05 Method for loading direct current mutual-inductor for applying to converter transformer bias magnet monitoring

Country Status (1)

Country Link
CN (1) CN101241156A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101893691A (en) * 2010-06-18 2010-11-24 上海纳杰电气成套有限公司 Forward power transformer iron core magnetic bias online detection method
CN103033695A (en) * 2011-09-28 2013-04-10 特变电工股份有限公司 Detection method of transformer direct current bias magnetic tolerance ability
CN103344808A (en) * 2013-06-20 2013-10-09 国家电网公司 Method for detecting transformer neutral point current direct-current component
CN103995177A (en) * 2014-04-22 2014-08-20 国家电网公司 Power transformer neutral point direct current measurement and wave-recording device and detection method
CN104374990A (en) * 2014-12-02 2015-02-25 国家电网公司 System and method for monitoring ground potential difference
CN105467241A (en) * 2015-12-08 2016-04-06 国家电网公司 A distributed converter transformer direct current bias detection system and a detection method thereof
CN109103847A (en) * 2018-08-01 2018-12-28 西南交通大学 A kind of converter power transformer saturation protecting method based on DC component estimation

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101893691A (en) * 2010-06-18 2010-11-24 上海纳杰电气成套有限公司 Forward power transformer iron core magnetic bias online detection method
CN103033695B (en) * 2011-09-28 2016-03-02 特变电工股份有限公司 The detection method of transformer tolerance DC magnetic biasing ability
CN103033695A (en) * 2011-09-28 2013-04-10 特变电工股份有限公司 Detection method of transformer direct current bias magnetic tolerance ability
CN103344808A (en) * 2013-06-20 2013-10-09 国家电网公司 Method for detecting transformer neutral point current direct-current component
CN103344808B (en) * 2013-06-20 2016-08-10 国家电网公司 A kind of detection method of transformer neutral point current direct-current component
WO2014201808A1 (en) * 2013-06-20 2014-12-24 国家电网公司 Method for detecting dc component of current at neutral-point of transformer
CN103995177B (en) * 2014-04-22 2016-06-08 国家电网公司 The measurement of power transformer neutral point direct current and wave recording device and detection method
CN103995177A (en) * 2014-04-22 2014-08-20 国家电网公司 Power transformer neutral point direct current measurement and wave-recording device and detection method
CN104374990A (en) * 2014-12-02 2015-02-25 国家电网公司 System and method for monitoring ground potential difference
CN104374990B (en) * 2014-12-02 2017-11-28 国家电网公司 A kind of system and method for carrying out ground potential difference monitoring
CN105467241A (en) * 2015-12-08 2016-04-06 国家电网公司 A distributed converter transformer direct current bias detection system and a detection method thereof
CN105467241B (en) * 2015-12-08 2018-04-13 国家电网公司 A kind of distribution converter transformer DC magnetic bias detecting system and its detection method
CN109103847A (en) * 2018-08-01 2018-12-28 西南交通大学 A kind of converter power transformer saturation protecting method based on DC component estimation
CN109103847B (en) * 2018-08-01 2019-12-20 西南交通大学 Converter transformer saturation protection method based on direct current component estimation

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