CN103364673A - Rapid identification method of resonant grounding system single-phase grounding end time - Google Patents

Rapid identification method of resonant grounding system single-phase grounding end time Download PDF

Info

Publication number
CN103364673A
CN103364673A CN2012100873757A CN201210087375A CN103364673A CN 103364673 A CN103364673 A CN 103364673A CN 2012100873757 A CN2012100873757 A CN 2012100873757A CN 201210087375 A CN201210087375 A CN 201210087375A CN 103364673 A CN103364673 A CN 103364673A
Authority
CN
China
Prior art keywords
delta
sampling
sampled point
values
resonant
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN2012100873757A
Other languages
Chinese (zh)
Inventor
张洋
李慧
王浩先
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
XUZHOU RUNZE ELECTRIC Co Ltd
Original Assignee
XUZHOU RUNZE ELECTRIC Co Ltd
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 XUZHOU RUNZE ELECTRIC Co Ltd filed Critical XUZHOU RUNZE ELECTRIC Co Ltd
Priority to CN2012100873757A priority Critical patent/CN103364673A/en
Publication of CN103364673A publication Critical patent/CN103364673A/en
Pending legal-status Critical Current

Links

Images

Abstract

The invention discloses a fault removal identification method in the field of a power system, and especially discloses a rapid identification method of a resonant grounding system single-phase grounding end time, belonging to the field of power monitoring. The method comprises the steps of sampling power grid voltage transformer PT opening delta voltage (which is zero sequence voltage), calculating the values of |Delta Uk1| to |Delta Uki|, calculating the values of zero sequence voltage jump amount of ||Delta Uk1|| to ||Delta Uki||, comparing the values of ||Delta Uk1|| to ||Delta Uki|| with a constant value 1, and when the values are larger than the constant value for three times continuously, judging that a single-phase grounding fault is removed. The method has the advantages of simplicity and easy implementation, high judgment precision, simple design and convenient operation, and the method is easy to realize by using a single chip microcomputer and is suitable for a resonant system with a single-phase grounding fault.

Description

The method for quickly identifying of a kind of resonant earthed system singlephase earth fault finish time
Technical field
The present invention relates to a kind of method for quickly identifying, relate in particular to a kind of resonant earthed system singlephase earth fault method for quickly identifying of the finish time, belong to electric power system fault recognition technology field.
Background technology
In current neutral ground field, the application of arc suppression coil automatic tracking and compensating equipment has become a kind of universal phenomenon.The compensation switching of damping resistance and arc suppression coil compensating system is constantly by judging whether electric power system fault exists decision.The judgement of whether excising for singlephase earth fault is at present mainly determined by this simplex criteria of size of residual voltage, because the simple and ambiguity of criterion, so that motionless or malfunction appears in damping resistance and arc suppression coil automatic tracking and compensating equipment, caused damping resistance to burn and had electric system that the neutral point displacement voltage that illusory ground connection causes occurs raising.
Summary of the invention
Problem for above-mentioned prior art existence, the invention provides a kind of resonant earthed system singlephase earth fault method for quickly identifying of the finish time, have simple, judge that precision is high, simplicity of design, computing is convenient, is easy to use chip microcontroller, is applicable to exist the effect of the resonator system of singlephase earth fault.
To achieve these goals, the technical solution used in the present invention is: the method for quickly identifying of a kind of resonant earthed system singlephase earth fault finish time may further comprise the steps:
(1) line voltage mutual inductor PT open delta voltage (being residual voltage) is sampled, establish an one periodic sampling and count and be N, U K1Expression k the sampled point in N the sampled point of sampling for the first time, U K2The expression sampling period second time is N the k in the sampled point, by that analogy, and U iK sampled point of N sampling number of i the sampling in expression ground;
(2) calculate
Figure 42001DEST_PATH_IMAGE001
,
Figure 685472DEST_PATH_IMAGE002
Figure 338082DEST_PATH_IMAGE001
Value, formula is:
Figure 67004DEST_PATH_IMAGE003
Figure 208135DEST_PATH_IMAGE004
Figure 706112DEST_PATH_IMAGE005
；
(3) calculate the residual voltage Sudden Changing Rate
Figure 477759DEST_PATH_IMAGE006
,
Figure 241447DEST_PATH_IMAGE007
Figure 123952DEST_PATH_IMAGE008
Value, computing formula is:
Figure 476436DEST_PATH_IMAGE009
Figure 481301DEST_PATH_IMAGE010
Figure 919236DEST_PATH_IMAGE011
；
(4) judge
Figure 651438DEST_PATH_IMAGE006
,
Figure 124007DEST_PATH_IMAGE007
Figure 237457DEST_PATH_IMAGE008
Whether greater than definite value 1, if then N zero setting enters step (8); If not, then enter step (5);
(5) carry out formula N=0, N=N+1;
(6) whether the N in the determining step (5) is more than or equal to 3, if then enter step (7); If not, then enter step (8);
(7) set " singlephase earth fault disappearance ";
(8) process ends.
The invention has the beneficial effects as follows: simple, judge that precision is high, simplicity of design, computing is convenient, is easy to use chip microcontroller, is applicable to exist the resonator system of singlephase earth fault.
Description of drawings
Fig. 1 is system software analysis process flow diagram of the present invention;
Fig. 2 is the cut-open view of control system of the present invention;
Fig. 3 is the local enlarged diagram of Fig. 2.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, the present invention includes following steps:
(1) line voltage mutual inductor PT open delta voltage (being residual voltage) is sampled, establish an one periodic sampling and count and be N, U K1Expression k the sampled point in N the sampled point of sampling for the first time, U K2The expression sampling period second time is N the k in the sampled point, by that analogy, and U iK sampled point of N sampling number of i the sampling in expression ground;
(2) calculate
Figure 225004DEST_PATH_IMAGE001
,
Figure 449312DEST_PATH_IMAGE002
Figure 510809DEST_PATH_IMAGE001
Value, formula is:
Figure 608209DEST_PATH_IMAGE003
Figure 20736DEST_PATH_IMAGE004
Figure 111052DEST_PATH_IMAGE012
；
(3) calculate the residual voltage Sudden Changing Rate
Figure 292634DEST_PATH_IMAGE006
,
Figure 693715DEST_PATH_IMAGE008
Value, computing formula is:
Figure 561494DEST_PATH_IMAGE010
；
(4) judge
Figure 371504DEST_PATH_IMAGE006
,
Figure 741305DEST_PATH_IMAGE007
Figure 444950DEST_PATH_IMAGE008
Whether greater than definite value 1, if then N zero setting enters step (8); If not, then enter step (5);
(5) carry out formula N=0, N=N+1;
(6) whether the N in the determining step (5) is more than or equal to 3, if then enter step (7); If not, then enter step (8);
(7) set " singlephase earth fault disappearance ";
(8) process ends.
The present invention adjusts inductance value and makes it away from tuning-points for for the debugging arc-extinguishing coil automatic tuning device; For the preset arc suppression coil automatic tuning apparatus, drop into damping resistance.After electric network single-phase earth fault is by excision failed equipment excision, judge electrical network earth fault finish time by measuring the variation of calculating the residual voltage Sudden Changing Rate.When measuring electrical network residual voltage Sudden Changing Rate, determine a bit first, then get its first two differs one and two cycle in the cycle point, with corresponding formula it is become our required residual voltage Sudden Changing Rate.According to the comparison of Sudden Changing Rate and default definite value, judge whether singlephase earth fault removes, identify fast fault finish time.Have simplely, judge that precision is high, simplicity of design, computing is convenient, is easy to use chip microcontroller, is applicable to exist the effect of the resonator system of singlephase earth fault.

Claims (1)

1. the method for quickly identifying of resonant earthed system singlephase earth fault finish time may further comprise the steps:
(1) line voltage mutual inductor PT open delta voltage (being residual voltage) is sampled, establish an one periodic sampling and count and be N, U K1Expression k the sampled point in N the sampled point of sampling for the first time, U K2The expression sampling period second time is N the k in the sampled point, by that analogy, and U iK sampled point of N sampling number of i the sampling in expression ground;
(2) calculate
Figure 2012100873757100001DEST_PATH_IMAGE001
,
Figure 2012100873757100001DEST_PATH_IMAGE002
Figure 842816DEST_PATH_IMAGE001
Value, formula is:
Figure 2012100873757100001DEST_PATH_IMAGE003
Figure 2012100873757100001DEST_PATH_IMAGE004
；
(3) calculate the residual voltage Sudden Changing Rate
Figure 2012100873757100001DEST_PATH_IMAGE006
,
Figure 2012100873757100001DEST_PATH_IMAGE007
Value, computing formula is:
Figure 2012100873757100001DEST_PATH_IMAGE009
Figure DEST_PATH_IMAGE010
Figure 2012100873757100001DEST_PATH_IMAGE011
；
(4) judge
Figure 510688DEST_PATH_IMAGE006
,
Figure 290426DEST_PATH_IMAGE007
Figure 747952DEST_PATH_IMAGE008
Whether greater than definite value 1, if then N zero setting enters step (8); If not, then enter step (5);
(5) carry out formula N=0, N=N+1;
(6) whether the N in the determining step (5) is more than or equal to 3, if then enter step (7); If not, then enter step (8);
(7) set " singlephase earth fault disappearance ";
(8) process ends.
CN2012100873757A 2012-03-29 2012-03-29 Rapid identification method of resonant grounding system single-phase grounding end time Pending CN103364673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012100873757A CN103364673A (en) 2012-03-29 2012-03-29 Rapid identification method of resonant grounding system single-phase grounding end time

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012100873757A CN103364673A (en) 2012-03-29 2012-03-29 Rapid identification method of resonant grounding system single-phase grounding end time

Publications (1)

Publication Number Publication Date
CN103364673A true CN103364673A (en) 2013-10-23

Family

ID=49366464

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2012100873757A Pending CN103364673A (en) 2012-03-29 2012-03-29 Rapid identification method of resonant grounding system single-phase grounding end time

Country Status (1)

Country Link
CN (1) CN103364673A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106771491A (en) * 2016-12-26 2017-05-31 国网北京市电力公司 Residual voltage measuring method and device
CN108802573A (en) * 2018-06-28 2018-11-13 西门子电力自动化有限公司 Detect the method and apparatus that earth fault disappears in electric system compensation network
CN111880110A (en) * 2019-04-15 2020-11-03 山东大学 Single-phase earth fault disappearance judgment method and system for neutral point non-effective earthing system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000308252A (en) * 1999-04-15 2000-11-02 Hitachi Ltd Digital protective relay device
CN102135591A (en) * 2011-02-28 2011-07-27 长沙理工大学 Resonant grounding power grid single-phase ground fault db wavelet transient component line selection method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000308252A (en) * 1999-04-15 2000-11-02 Hitachi Ltd Digital protective relay device
CN102135591A (en) * 2011-02-28 2011-07-27 长沙理工大学 Resonant grounding power grid single-phase ground fault db wavelet transient component line selection method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
李晓波等: "一起消弧线圈控制装置异常动作事件分析及改进措施", 《电力系统保护与控制》, vol. 39, no. 10, 16 May 2011 (2011-05-16) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106771491A (en) * 2016-12-26 2017-05-31 国网北京市电力公司 Residual voltage measuring method and device
CN106771491B (en) * 2016-12-26 2020-06-19 国网北京市电力公司 Zero sequence voltage measuring method and device
CN108802573A (en) * 2018-06-28 2018-11-13 西门子电力自动化有限公司 Detect the method and apparatus that earth fault disappears in electric system compensation network
CN111880110A (en) * 2019-04-15 2020-11-03 山东大学 Single-phase earth fault disappearance judgment method and system for neutral point non-effective earthing system
CN111880110B (en) * 2019-04-15 2021-08-27 山东大学 Single-phase earth fault disappearance judgment method and system for neutral point non-effective earthing system

Similar Documents

Publication Publication Date Title
CN100386637C (en) Fault line selection method for single-phase-to-ground fault in small ground current distribution network
WO2018094862A1 (en) Method for identifying single pole ground fault in vsc-dc power distribution network, and single pole ground fault protection method for vsc-dc power distribution network
Zhalefar et al. A high-speed adaptive single-phase reclosing technique based on local voltage phasors
CN104538940B (en) A kind of single-ended guard method of extra high voltage direct current transmission line
Khodadadi et al. A noncommunication adaptive single-pole autoreclosure scheme based on the ACUSUM algorithm
CN101726692B (en) Single-phase ground fault positioning method for ground protective device of low-current system
CN103293446A (en) Small-current grounding fault line selection method based on arc suppression coil
CN103760465A (en) Single-phase earth fault direction judgment and processing method of small current grounding system
CN104218523B (en) detecting circuit for circuit breaker
CN203688722U (en) Single-phase grounding fault processing device for small-current grounding system
CN103368151A (en) Method of realizing line-to-ground fault phase selection by using sequence voltage phase characteristic
CN107505539B (en) Distribution network arc light grounding fault identification method
CN112285601A (en) Multi-terminal low-current grounding flexible direct current system single-pole grounding fault line selection method
CN105606955B (en) A kind of faulty line method of discrimination based on numerical differentiation and empirical mode decomposition
CN110865278A (en) Ground fault positioning method based on transient mutation energy capturing method
Suonan et al. A novel single-phase adaptive reclosure scheme for transmission lines with shunt reactors
CN105262069A (en) High-voltage DC line pilot protection method based on fault DC component
CN103777114A (en) Method for recognizing single-phase permanent fault of single-ended electric transmission line with paralleling reactor
CN103364673A (en) Rapid identification method of resonant grounding system single-phase grounding end time
CN102879671A (en) Method for judging inrush current locking of equivalent instantaneous inductance for protection of extra-high voltage regulating transformer
Zadeh et al. An adaptive HV transmission lines reclosing based on voltage pattern in the complex plane
CN105931823A (en) Method for automatic tracking adjustment of resonance elimination resistor of voltage transformer
CN102879710B (en) System and method for detecting single-phase ground fault point of power distribution line
CN103166176A (en) Under-voltage protection tripper for low-voltage circuit breaker
CN104133144A (en) Magnetizing inrush current discrimination method based on differential current wavelet packet decomposition

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20131023