CN103605041A - Non-contact multi-point grounding detection method and system for secondary circuit of current transformer - Google Patents
Non-contact multi-point grounding detection method and system for secondary circuit of current transformer Download PDFInfo
- Publication number
- CN103605041A CN103605041A CN201310565336.8A CN201310565336A CN103605041A CN 103605041 A CN103605041 A CN 103605041A CN 201310565336 A CN201310565336 A CN 201310565336A CN 103605041 A CN103605041 A CN 103605041A
- Authority
- CN
- China
- Prior art keywords
- current
- neutral line
- multipoint earthing
- iron core
- secondary circuit
- 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.)
- Granted
Links
Images
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention relates to a non-contact multi-point grounding detection method and system for a secondary circuit of a current transformer. A changing magnetic field is exerted on a neutral line in a secondary circuit; on the basis of Faraday's law of electromagnetic induction, whether a current is generated in the neutral line is determined; and only when two-point grounding occurs at the secondary circuit is the current generated in the neutral line. And if only one-point grounding occurs at the loop, no current is generated. The system comprises: a signal injection system, which is used for exerting a changing magnetic field perpendicular to the neutral line in the neutral line; a signal acquisition device, which is used for collecting the current of the neutral line; and a data processing and grounding criterion system, which is used for determining whether multi-point grounding occurs. According to the invention, the method and the system can be applied to a transformation substation for determination of current transformer secondary circuit multi-point grounding examination; and on the premise that normal running of the protection device is ensured to be not influenced, whether multi-point grounding occurs at the secondary circuit of the current transformer can be effectively detected.
Description
Technical field
The present invention relates to a kind of contactless transformer station's secondary loop of mutual inductor multipoint earthing detection method and system thereof, belong to power automation technical field.
Background technology
In electric system, secondary circuit plays very important effect to safeguards system safe and stable operation, under system normal operating mode, in order to guarantee the safety of the person and equipment, 18 the great anti-accident measures > of electrical network > of < < State Grid Corporation of China, an electrical connection of < < electric operating site safety rules > > rated current transformer secondary circuit must have a reliable earth point.Simultaneously in order to guarantee the correct work of relay protection and automatic safety device, require in current return, to only have an earth point.But because transformer station's electric current secondary loop often connects a plurality of equipment; expanded range is wide; usually due to reasons such as artificial wiring error or secondary circuit insulation ag(e)ings; in the electric current secondary loop of an electrical connection, occur a plurality of earth points, multipoint earthing causes the accident of bus protection, main transformer protection, route protection incorrect operation to occur repeatedly.
Secondary loop of mutual inductor multipoint earthing has two kinds of situations: 1) neutral line multipoint earthing; 2) protective device both sides multipoint earthing, multipoint earthing mode (as shown in Figure 1).
As shown in Figure 1, R1, R2, R3 are respectively protective device ABC three-phase sampling circuit substitutional resistance.Under normal circumstances, TA second loop grounding point has and only has one, at CT root or indoor in protection, in Fig. 1, has earth point and is connected to the mode of connection in protection screen.1., 2. distinguish analog current loop neutral line multipoint earthing and two kinds of Groundings of protection both sides multipoint earthing.
Situation for 2 ground connection of the neutral line, because grounding net of transformer substation is not actual equipotential plane, difference there will be certain potential difference (PD), potential difference (PD) will be scurried into secondary loop of mutual inductor, while especially there is short-circuit current or thunder-strike current in grounded screen, cable shield difference current potential is different, makes current flowing in screen layer, may burn out screen layer, and secondary circuit is produced and disturbed.
For protective device both sides multipoint earthing point situation; if grounding net of transformer substation is equipotential net (being without potential difference (PD) between earth point); secondary loop current shunting can be caused in the shunt circuit that two earth points and earth mat form, and makes to flow through protective device sampling circuit electric current and greatly reduces.If grounding net of transformer substation is non-equipotential net, between the earth point of protective device both sides, there is potential difference (PD), the electric current that potential difference (PD) causes flows through protective device, makes protective device sampling incorrect.
Above-mentioned analysis is known, and secondary loop of mutual inductor multipoint earthing can exert an influence to the sampling of protective device or automatic safety device, and then affects the action behavior of protective device.
Substation field checks that the method for multipoint earthing is mainly to remove former earth point, determines whether to exist multipoint earthing phenomenon by measuring circuit resistance to earth at present.Related article has also proposed the detection method of other current return multipoint earthings, utilizes the multipoint earthing in the method detection loop of low-voltage ac signal injection as a kind of.This method is simply effective, multipoint earthing phenomenon can be detected quickly and accurately, but need in former loop, seal in low-voltage signal generating means, is not suitable for large-scale promotion, especially for the transformer station having put into operation.So a kind of contactless multipoint earthing detection method that does not change primary current loop of necessary research.
Summary of the invention
For the deficiency existing in prior art; the object of the invention is to provide a kind of contactless transformer station secondary loop of mutual inductor multipoint earthing detection method based on Faraday's electromagnetic induction law; and build non-contact type current loop multipoint earthing detection system; utilize under the prerequisite that this detection method can guarantee that normal operation does not exert an influence to protective device, effectively detect secondary loop of mutual inductor whether multipoint earthing occurs.
To achieve these goals, the present invention realizes by the following technical solutions:
A non-contact type current transformer secondary circuit multipoint earthing detection method, based on Faraday's electromagnetic induction law, its method is: (1) non-contact type signal injects; In the secondary loop of mutual inductor neutral line, apply the variation magnetic field vertical and neutral line, make the magnetic flux that changes in the neutral line, realize non-contact type signal injection;
(2) whether judge on the neutral line generation current, if generation current is multipoint earthing; Otherwise be one point earth.
In above-mentioned steps (1), signal injection system is installed on the described neutral line, by signal injection system, makes it produce the variation magnetic field of vertical and the neutral line.
Described signal injection system comprise can folding pliers iron core, be arranged on coil on pliers iron core and the ac current source of connecting coil, coil connects ac current source, exchange current by coil can excite the magnetic flux of alternation in iron core, described pliers iron core vertical clamping, on the neutral line, makes to apply on the neutral line magnetic field vertical and neutral line variation.
In above-mentioned steps (1), at pliers iron core vertical clamping, before the neutral line, confirm that alternating current source signal is output as zero, set of frequency is numerical value M, 0 < M≤50 hertz; Then by pliers iron core vertical clamping on the neutral line, the current source output current of increasing exchanges gradually, makes to produce in the neutral line magnetic flux.
In above-mentioned steps (2), for judging on the neutral line, whether generation current is by observing the variation of the current values of current collecting device, if current values is zero always, the numerical value that outputs current to of the current source of further increasing exchanges is N, wherein, 05 amperes of < N <, increase power frequency to numerical value is L simultaneously, wherein, and L≤150Hz, if electric current do not detected yet, judge and in secondary circuit, do not have multipoint earthing phenomenon;
If along with current source output current increases, current collecting device detects electric current to be increased, and the output current of the current source that continues to increase exchanges is until data processing and multipoint earthing criterion system detect measured electric current number
value is more than or equal to 10mA, after this, utilize data processing and multipoint earthing criterion system to detect measured power frequency and should be M
(otherwise, again detect)
, now, graduallyreduce the output current of ac current source, increase power frequency numerical value to 2M simultaneously, now recycle the numerical value that data processing and multipoint earthing criterion system detect measured power frequency and should be 2M
(otherwise, again detect), determine that loop exists multipoint earthing phenomenon, and send alarm signal by data processing and multipoint earthing criterion system.
As preferably, described signal pickup assembly is real, and what adopt is high-precision current split-core type meter, easy to use, improves the precision gathering.
A contactless secondary loop of mutual inductor multipoint earthing detection system, it comprises:
Signal injection system, is arranged on the neutral line of transformer station's secondary loop of mutual inductor, for apply the variation magnetic field of vertical and the neutral line in the neutral line;
Signal pickup assembly, is arranged on the neutral line of transformer station's secondary loop of mutual inductor, for whether gathering on the neutral line generation current;
Data processing and multipoint earthing criterion system, be connected with signal pickup assembly, for receiving the Information Monitoring that signal pickup assembly is sent into, and carry out data analysis and multipoint earthing differentiation according to Information Monitoring, according to the criterion logic arranging in system and definite value, differentiate whether multipoint earthing occurs, and send alarm signal and judge whether secondary loop of mutual inductor multipoint earthing occurs.
Further, described data processing and multipoint earthing criterion system differentiate according to the criterion logic arranging in system and definite value whether multipoint earthing occurs, if multipoint earthing send alarm signal.
According to the criterion logic arranging in data processing and multipoint earthing criterion system and definite value, differentiate, the output current when ac current source is 5A, when output current frequency is increased to 150Hz simultaneously, if data processing and multipoint earthing criterion system detect measured neutral current numerical value and are still less than 10mA, there is not multipoint earthing in judgement, if in N and M increase process, data processing and multipoint earthing criterion system detect measured neutral current numerical value and have reached 10mA, there is multipoint earthing in judgement, and send alarm signal; Data processing and multipoint earthing criterion function are exactly the controller of the function of current acquisition and size of current differentiation, and it is embodied as prior art.
Described signal injection system comprise can folding pliers iron core, be arranged on coil on pliers iron core and the ac current source of connecting coil, coil connects ac current source, exchange current by coil can excite the magnetic flux of alternation in iron core, described pliers iron core vertical clamping, on the neutral line, makes to apply on the neutral line magnetic field vertical and neutral line variation.
As preferentially, what described ac current source adopted is single-phase relay-protection tester.
The structure of non-contact type current secondary circuit multipoint earthing detection method of the present invention and detection platform, by apply the magnetic field of variation in the secondary circuit neutral line, based on Faraday's electromagnetic induction law, whether judge in the neutral line has electric current to produce, only have while there is 2 ground connection in secondary circuit, just can generation current in the neutral line
if loop only has one point earth, can not form electric current, can conveniently for transformer station, check the judgement of secondary loop of mutual inductor multipoint earthing; under the assurance prerequisite that normal operation does not exert an influence to protective device, effectively detect secondary loop of mutual inductor whether multipoint earthing occurs.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, describe the present invention in detail;
Fig. 1 is existing current transformer multipoint earthing schematic diagram;
Fig. 2 is neutral line multipoint earthing schematic diagram of the present invention;
Fig. 3 is protection of the present invention both sides multipoint earthing schematic diagram;
Fig. 4 is non-contact type current secondary circuit multipoint earthing detection system of the present invention;
Fig. 5 is the equivalent electrical circuit of non-contact type current secondary circuit multipoint earthing detection system of the present invention;
Fig. 6 is non-contact type current secondary circuit multipoint earthing overhaul flow chart of the present invention.
embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with embodiment, further set forth the present invention.
Referring to Fig. 2-Fig. 6, the non-contact type current secondary circuit multipoint earthing detection method of the present embodiment, and build non-contact type current loop multipoint earthing detection system; It is Faraday's electromagnetic induction law,, in the secondary loop of mutual inductor neutral line, apply the variation magnetic field vertical and neutral line, make the magnetic flux that changes in the neutral line, realize non-contact type signal injection; Then whether judge on the neutral line generation current, if generation current is multipoint earthing; Otherwise be one point earth.Specifically being implemented as follows of the present embodiment:
1. the non-contact type signal method for implanting based on electromagnetic induction;
Referring to Fig. 2 and Fig. 3, according to Faraday's electromagnetic induction law, in wire loop, the variation meeting of magnetic flux produces induction electromotive force in wire loop, and magnetic flux change must be faster, and induction electromotive force is larger.
The loop of bis-multipoint earthings of current transformer TA can be considered as wire loop, applies the magnetic field of variation in loop, can produce induction electromotive force
, realize AC signal and inject.In formula,
for induction electromotive force,
for the magnetic flux changing,
for loop substitutional resistance,
for loop current.
In Fig. 2 and Fig. 3, it has provided in two kinds of multipoint earthing situations of TA secondary circuit, utilizes Faraday's electromagnetic induction law to realize the method schematic diagram of signal injection.As seen from the figure, only have while there is 2 ground connection in secondary circuit, just can generation current in the neutral line
if loop only has one point earth, can not form electric current
, can judge accordingly whether loop exists multipoint earthing.
In the secondary circuit neutral line, apply the magnetic field of variation, can realize contactless signal injection.Principle of work based on power transformer, the exchange current of primary winding can excite the magnetic flux of alternation in iron core, by the iron core of current transformer make can folding pliers, form jaw type iron core, by jaw type iron core clamp on the TA secondary circuit neutral line, the magnetic flux that can change in the neutral line, injects thereby realize multipoint earthing loop non-contact type signal.
2. contactless multipoint earthing detects implementation method;
As shown in Figure 4, realizing the injection of non-contact type signal source, multipoint earthing loop is the prerequisite of carrying out multipoint earthing detection, the present embodiment provides a kind of non-contact type current loop multipoint earthing detection system of electromagnetic induction, comprises three parts: signal injection system, signal pickup assembly and data processing and ground connection criterion system.
Signal injection system is comprised of jaw type iron core and ac current source, on jaw type iron core, is provided with coil, and by coil and ac current source, what the ac current source of the present embodiment adopted is single-phase relay-protection tester.This ac current source produces the constant adjustable electric current of frequency
, this current return is wound around n circle as the primary coil of jaw type iron core, and jaw type iron core produces the magnetic flux of steady change under the primary coil function of current
.The TA secondary circuit neutral line and other earth points form closed-loop path, as the secondary coil of jaw type iron core, according to Faraday's electromagnetic induction law, in secondary coil, can produce induction electromotive force, and current flowing
.
In this enforcement, what signal pickup assembly adopted is high-precision current split-core type meter, and it collects the electric current in the neutral line
, and send into that data processing and multipoint earthing criterion system are carried out data analysis and multipoint earthing is differentiated, and according to the criterion logic arranging in system and definite value, differentiate whether multipoint earthing occurs, if there is multipoint earthing, send alarm signal.
In the present embodiment, according to the criterion logic arranging in data processing and multipoint earthing criterion system and definite value, differentiate, its discriminant approach is: when the output current of ac current source is 5A, when output current frequency is increased to 150Hz simultaneously, if data processing and multipoint earthing criterion system detect measured neutral current numerical value and are still less than 10mA, there is not multipoint earthing in judgement, if in the output current and power frequency increase process of ac current source, data processing and multipoint earthing criterion system detect that measured neutral current numerical value has reached 10mA or more than 10mA, there is multipoint earthing in judgement, and send alarm signal, data processing and multipoint earthing criterion function are exactly the controller of the function differentiated of current acquisition and size of current, and it is embodied as prior art, existing not burden in addition.
The jaw type iron core of a whole set of contactless multipoint earthing detection system requires to clamp easily on the current return neutral line, makes the magnetic field energy that ac current source produces in jaw type iron core pass the neutral line, and has good magnetic property.Data processing and ground connection criterion system are carried out analytical calculation to the secondary current (neutral current) gathering, and according to the current ration criterion of setting, judge whether to exist multipoint earthing phenomenon.
3. the theoretical analysis of multipoint earthing detection method
Set up the reliability and feasibility Exact Analysis of corresponding mathematical model to the detection method of contactless multipoint earthing, the position of ground loop resistance, iron core excitation property, jaw type iron core and the neutral line all can have influence on final testing result.
Contactless multipoint earthing detection system principle of work is similar to ideal transformer, jaw type iron core can be regarded the field core of ideal transformer as, the current return that ac current source is wound around is regarded primary coil as, the ground loop that the neutral line and other earth points form is regarded secondary coil as, and its equivalent circuit as shown in Figure 4.
According to transformer working principle, when not considering iron core iron loss, leakage field,
, former secondary current ratio and coil turn are inversely proportional to.
Although contactless multipoint earthing detection system isoboles is similar to transformer device structure as shown in Figure 4, can not continue to use above-mentioned formula.Main cause is: 1) jaw type iron core is not completely closed iron core, and magnetic property is poor compared with transformer core; 2) neutral earthing point is very large with the secondary circuit possibility area that other earth points form, and the space magnetic field that it is subject to as secondary coil disturbs very large.
The secondary current of contactless multipoint earthing detection system can calculate according to Faraday's electromagnetic induction law, regards secondary coil as a wire loop plane, the magnetic flux that primary current changes in iron core
, in secondary coil, can produce induction electromotive force
.If
,
for the effective value of main flux in iron core, suppose that jaw type iron core vertical folder is on the neutral line, in secondary coil, induced voltage is:
（1）
Secondary coil electric current is:
Magnetic flux in iron core
by former limit current-carrying coil, produced, for ease of analyzing, suppose that primary coil is circular coil, Current-Carrying Circular Coil is in the magnetic field intensity in the center of circle
, wherein
for the magnetic permeability of iron core,
for electric current in primary coil,
radius for former limit circular coil.If
,
Wherein
for the sectional area of jaw type iron core,
for primary current effective value, by formula (3) substitution (2), can obtain secondary coil electric current and be:
By (4) formula, can be found out electric current in secondary coil neutral return path during multipoint earthing
size and iron core magnetic permeability
, primary current frequency
, primary current effective value
, core section is long-pending
be directly proportional, and with ground loop resistance
with primary coil radius
be inversely proportional to.When TA secondary circuit only has one point earth,
,
; During multipoint earthing,
, detect
size can differentiate whether there is multipoint earthing phenomenon.
4, non-contact type current transformer secondary circuit multipoint earthing detection specific implementation method is as follows:
While there is multipoint earthing in loop, the method of injecting by non-contact type signal, in the neutral line, truly have electric current to produce, non-contact type current loop multipoint earthing detect basic skills be detect electric current in neutral return path have or not to judge whether to have occurred multipoint earthing.
Multipoint earthing method of discrimination is simple, but still needs to be considered as the current ration how to confirm of criterion during practical operation.Consider current clamp meter accuracy and protective device is affected, the present embodiment is made as 10mA by current ration.The electric current of current most of high-precision electric current split-core type meter energy Measurement accuracy 10mA, this electric current also can not produce large impact to protection sampling simultaneously.
Owing to not knowing whether there is multipoint earthing in loop before test, ground loop resistance sizes is unknown, therefore can not directly inject large electric current, radio-frequency signal, in case exist multipoint earthing and loop resistance hour,
excessively cause protective device malfunction.After deliberation, as shown in Figure 5, non-contact type current transformer secondary circuit multipoint earthing detection method, concrete steps are as follows:
(1) at pliers iron core vertical clamping before the neutral line, confirm that alternating current source signal is output as 0, set of frequency is numerical value 50Hz;
(2) then by pliers iron core vertical clamping on the neutral line, the current source output current of increasing exchanges gradually, makes to produce in the neutral line magnetic flux, and constantly to pay close attention to the electric current split-core type meter of pincers on the neutral line be the current values of signal pickup assembly
change; If
=0, current values is zero always, and the numerical value that outputs current to of the current source of further increasing exchanges is 5A, increase power frequency simultaneously and be up to 150Hz, if electric current do not detected yet, neutral current is still zero, judges and in secondary circuit, does not have multipoint earthing phenomenon; If
, enter step (3).
(3) if along with current source output current increases, current collecting device detects electric current to be increased, and the numerical value that outputs current to of the current source that continues to increase exchanges is greater than 10MA, now, utilizes data processing and multipoint earthing criterion system to detect measured electric current
frequency should be 50Hz; Can there is multipoint earthing phenomenon in primitive decision loop in the first judgement.
(4) on the basis of the above, suitable
graduallyreduce the output current amplitude of ac current source, improve output current frequency numerical value simultaneously and guarantee during 100Hz(
be not more than 20mA), finally recycle data processing and multipoint earthing criterion system and detect institute and detect
frequency should be 100Hz(if not again detect), determine that loop exists multipoint earthing phenomenon, and send alarm signal by data processing and multipoint earthing criterion system.In conjunction with current amplitude criterion and frequency criterion, can determine in loop have multipoint earthing phenomenon to exist.
applicable cases
The non-contact type current loop multipoint earthing detection method proposing in the present embodiment has been carried out verification experimental verification in laboratory; in laboratory, carry out test as shown in Figure 5; current source is provided by single-phase relay-protection tester; iron core is current transformer iron core used, and secondary winding adopts the cable loop that seals in adjustable resistance.The feasibility of said method and the correctness of theoretical analysis have been verified by experiment; test findings shows; utilize under the prerequisite that this detection method can guarantee that normal operation does not exert an influence to protective device; effectively detect secondary loop of mutual inductor whether multipoint earthing occurs, can conveniently for transformer station, check sentencing of secondary loop of mutual inductor multipoint earthing.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (9)
1. a non-contact type current transformer secondary circuit multipoint earthing detection method, based on Faraday's electromagnetic induction law, its method is: (1) non-contact type signal injects; In the secondary loop of mutual inductor neutral line, apply the variation magnetic field perpendicular to the neutral line, make the magnetic flux that changes in the neutral line, realize non-contact type signal and inject;
(2) whether judge on the neutral line generation current, if generation current is multipoint earthing; Otherwise be one point earth.
2. contactless transformer station according to claim 1 secondary loop of mutual inductor multipoint earthing detection method, it is characterized in that, in above-mentioned steps (1), signal injection system is installed on the described neutral line, by signal injection system, makes it produce the variation magnetic field of vertical and the neutral line.
3. non-contact type current transformer secondary circuit multipoint earthing detection method according to claim 2, it is characterized in that, described signal injection system comprise can folding pliers iron core, be arranged on coil on pliers iron core and the ac current source of connecting coil, coil connects ac current source, exchange current by coil can excite the magnetic flux of alternation in iron core, described pliers iron core vertical clamping, on the neutral line, makes to apply on the neutral line magnetic field changing perpendicular to the neutral line.
4. non-contact type current transformer secondary circuit multipoint earthing detection method according to claim 3, it is characterized in that, in above-mentioned steps (1), at pliers iron core vertical clamping before the neutral line, confirm that alternating current source signal is output as zero, set of frequency is numerical value M, 0 < M≤50 hertz; Then by pliers iron core vertical clamping on the neutral line, the current source output current of increasing exchanges gradually, makes to produce in the neutral line magnetic flux.
5. contactless transformer station according to claim 4 secondary loop of mutual inductor multipoint earthing detection method, it is characterized in that, in above-mentioned steps (2), for judging on the neutral line, whether generation current is by observing the variation of the current values of current collecting device, if current values is zero always, the numerical value that outputs current to of current source of further increasing exchanges is N, wherein, 05 amperes of < N <, increase power frequency to numerical value is L simultaneously, wherein, L≤150Hz, if electric current do not detected yet, judge and in secondary circuit, do not have multipoint earthing phenomenon,
If along with current source output current increases, current collecting device detects electric current to be increased, the output current of current source of continuing to increase exchanges is more than or equal to 10mA until data processing and multipoint earthing criterion system detect measured current values, now, utilize data processing and multipoint earthing criterion system to detect measured power frequency for M, then, reduce gradually the output current of ac current source, increase power frequency numerical value to 2M simultaneously, if now recycle the numerical value 2M that data processing and multipoint earthing criterion system detect measured power frequency, determine that loop exists multipoint earthing phenomenon, and send alarm signal by data processing and multipoint earthing criterion system.
6. a non-contact type current transformer secondary circuit multipoint earthing detection system, it comprises:
Signal injection system, is arranged on the neutral line of transformer station's secondary loop of mutual inductor, for apply the variation magnetic field of vertical and the neutral line in the neutral line;
Signal pickup assembly, is arranged on the neutral line of transformer station's secondary loop of mutual inductor, for whether gathering on the neutral line generation current;
Data processing and multipoint earthing criterion system, be connected with signal pickup assembly, for receiving the Information Monitoring that signal pickup assembly is sent into, and carry out data analysis and multipoint earthing differentiation according to Information Monitoring, according to criterion logic and definite value differentiation secondary loop of mutual inductor, whether there is multipoint earthing, if multipoint earthing, sends alarm signal judgement.
7. contactless secondary loop of mutual inductor multipoint earthing detection system according to claim 6, is characterized in that, what described signal pickup assembly adopted in fact is high-precision current split-core type meter.
8. non-contact type current transformer secondary circuit multipoint earthing detection system according to claim 6, it is characterized in that, described signal injection system comprise can folding pliers iron core, be arranged on coil on pliers iron core and the ac current source of connecting coil, coil connects ac current source, exchange current by coil can excite the magnetic flux of alternation in iron core, described pliers iron core vertical clamping, on the neutral line, makes to apply on the neutral line magnetic field vertical and neutral line variation.
9. non-contact type current transformer secondary circuit multipoint earthing detection system according to claim 6, is characterized in that, what described ac current source adopted is single-phase relay-protection tester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310565336.8A CN103605041B (en) | 2013-11-14 | 2013-11-14 | Non-contact multi-point grounding detection method and system for secondary circuit of current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310565336.8A CN103605041B (en) | 2013-11-14 | 2013-11-14 | Non-contact multi-point grounding detection method and system for secondary circuit of current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103605041A true CN103605041A (en) | 2014-02-26 |
| CN103605041B CN103605041B (en) | 2017-01-18 |
Family
ID=50123281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310565336.8A Active CN103605041B (en) | 2013-11-14 | 2013-11-14 | Non-contact multi-point grounding detection method and system for secondary circuit of current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103605041B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772192A (en) * | 2016-12-12 | 2017-05-31 | 国家电网公司 | Secondary Circuit of Potential Transformer multipoint earthing detection means |
| CN108710098A (en) * | 2018-05-18 | 2018-10-26 | 深圳供电局有限公司 | A kind of secondary loop of mutual inductor load detection method |
| CN109991517A (en) * | 2019-04-16 | 2019-07-09 | 华能山东石岛湾核电有限公司 | For judging the structure and its test method of position of failure point |
| CN111505533A (en) * | 2020-05-06 | 2020-08-07 | 南京四联共创电气工程有限公司 | Ground wire test terminal and system and ground wire test method under uninterrupted power supply working condition |
| CN115811035A (en) * | 2023-01-29 | 2023-03-17 | 国网山西省电力公司电力科学研究院 | Transformer core multipoint grounding current optimal current-limiting impedance selection device and method |
| CN116087866A (en) * | 2023-04-11 | 2023-05-09 | 山东泰开互感器有限公司 | Short-circuit resistance test system and method for secondary grounding system of current transformer |
| CN109991517B (en) * | 2019-04-16 | 2024-05-03 | 华能山东石岛湾核电有限公司 | Structure for judging fault point position and test method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009168664A (en) * | 2008-01-17 | 2009-07-30 | Chugoku Electric Power Co Inc:The | Clamp meter and dc ground fault line exploration method |
| CN201569718U (en) * | 2009-11-27 | 2010-09-01 | 山西晋能电力科技有限公司 | On-line monitoring device for two-point earthing of AC voltage and current secondary loop |
| CN101968524A (en) * | 2010-09-30 | 2011-02-09 | 王道龙 | Division test method and tester for multi-point grounding of common loop |
| CN102288868A (en) * | 2011-08-12 | 2011-12-21 | 安徽省电力公司淮南供电公司 | One-point grounding detector and detection method for voltage transformer secondary coil neutral line |
| CN202815129U (en) * | 2012-08-03 | 2013-03-20 | 山东电力集团公司日照供电公司 | Novel voltage transformer secondary circuit multipoint earthing detector |
| CN202886524U (en) * | 2012-09-13 | 2013-04-17 | 温州市科星电子有限公司 | Transformer station voltage transformer secondary circuit grounding monitoring device |
| CN202975229U (en) * | 2012-12-17 | 2013-06-05 | 山西省电力公司运城供电分公司 | Multipoint earthing detection locator for secondary circuits of transformer substations |
| CN103197195A (en) * | 2013-03-29 | 2013-07-10 | 国家电网公司 | Detecting method and detecting system for multipoint earthing of voltage second loop neutral conductor network |
-
2013
- 2013-11-14 CN CN201310565336.8A patent/CN103605041B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009168664A (en) * | 2008-01-17 | 2009-07-30 | Chugoku Electric Power Co Inc:The | Clamp meter and dc ground fault line exploration method |
| CN201569718U (en) * | 2009-11-27 | 2010-09-01 | 山西晋能电力科技有限公司 | On-line monitoring device for two-point earthing of AC voltage and current secondary loop |
| CN101968524A (en) * | 2010-09-30 | 2011-02-09 | 王道龙 | Division test method and tester for multi-point grounding of common loop |
| CN102288868A (en) * | 2011-08-12 | 2011-12-21 | 安徽省电力公司淮南供电公司 | One-point grounding detector and detection method for voltage transformer secondary coil neutral line |
| CN202815129U (en) * | 2012-08-03 | 2013-03-20 | 山东电力集团公司日照供电公司 | Novel voltage transformer secondary circuit multipoint earthing detector |
| CN202886524U (en) * | 2012-09-13 | 2013-04-17 | 温州市科星电子有限公司 | Transformer station voltage transformer secondary circuit grounding monitoring device |
| CN202975229U (en) * | 2012-12-17 | 2013-06-05 | 山西省电力公司运城供电分公司 | Multipoint earthing detection locator for secondary circuits of transformer substations |
| CN103197195A (en) * | 2013-03-29 | 2013-07-10 | 国家电网公司 | Detecting method and detecting system for multipoint earthing of voltage second loop neutral conductor network |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772192A (en) * | 2016-12-12 | 2017-05-31 | 国家电网公司 | Secondary Circuit of Potential Transformer multipoint earthing detection means |
| CN108710098A (en) * | 2018-05-18 | 2018-10-26 | 深圳供电局有限公司 | A kind of secondary loop of mutual inductor load detection method |
| CN108710098B (en) * | 2018-05-18 | 2021-02-19 | 深圳供电局有限公司 | Current transformer secondary circuit load detection method |
| CN109991517A (en) * | 2019-04-16 | 2019-07-09 | 华能山东石岛湾核电有限公司 | For judging the structure and its test method of position of failure point |
| CN109991517B (en) * | 2019-04-16 | 2024-05-03 | 华能山东石岛湾核电有限公司 | Structure for judging fault point position and test method thereof |
| CN111505533A (en) * | 2020-05-06 | 2020-08-07 | 南京四联共创电气工程有限公司 | Ground wire test terminal and system and ground wire test method under uninterrupted power supply working condition |
| CN115811035A (en) * | 2023-01-29 | 2023-03-17 | 国网山西省电力公司电力科学研究院 | Transformer core multipoint grounding current optimal current-limiting impedance selection device and method |
| CN116087866A (en) * | 2023-04-11 | 2023-05-09 | 山东泰开互感器有限公司 | Short-circuit resistance test system and method for secondary grounding system of current transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103605041B (en) | 2017-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Huang et al. | A novel approach for fault location of overhead transmission line with noncontact magnetic-field measurement | |
| CN102680798B (en) | Online measurement method and device for grounding resistor of rod tower | |
| CN205080251U (en) | Through -flow calibration system of current transformer secondary circuit | |
| CN103605041B (en) | Non-contact multi-point grounding detection method and system for secondary circuit of current transformer | |
| CN102608485B (en) | Detection method for zero-sequence current loops of transformer substations | |
| CN102565618A (en) | Method for detecting zero-sequence voltage circuit of transformer substation | |
| CN101216524A (en) | 1000KV alternating-current ultrahigh voltage transmission lines earth fault positioning technology and apparatus | |
| CN105093058B (en) | Current Transformer Secondary side open circuit method of discrimination and corresponding discriminating gear | |
| CN103454544B (en) | A kind of detection method based on the linear magnetism elimination circuit of electronic jumper | |
| CN105467192B (en) | A kind of method for measuring current conversion station ground potential and rising | |
| Schöttke et al. | Transfer characteristic of a MV/LV transformer in the frequency range between 2 kHz and 150 kHz | |
| CN105954633A (en) | Method for detecting interturn fault of reactor through loss vector angle change and detection structure | |
| CN103424627B (en) | The method of double-end measurement parallel grid line zero-sequence impedance | |
| CN103439682B (en) | A kind of portable type current transformer combination misalignment proving installation is adopted to carry out the method for methods of composite errors on current transformer test | |
| CN114184980A (en) | Low-voltage leakage positioning equipment and online leakage evaluation method | |
| Yan et al. | Research on measurement technology of transformer no-load loss based on Internet of Things | |
| CN205861822U (en) | A kind of assay device detecting open circuit of secondary loop of current transformer | |
| CN102879657B (en) | Method for checking phase sequences of lines | |
| CN106526527B (en) | A method of it finding minimum angle and differentiates four line wiring of low voltage three-phase | |
| CN114184981B (en) | Low-voltage electric leakage positioning equipment and off-line electric leakage assessment method | |
| CN105403808B (en) | A kind of localization method and device of DC line earth fault | |
| CN107219443A (en) | A kind of transient state recording indicator | |
| CN208172234U (en) | A kind of no-load voltage ratio of current transformer, Check up polarity experimental rig | |
| Karmakar et al. | Machine learning approach to estimation of internal parameters of a single phase transformer | |
| CN103176048B (en) | A kind of method of quick measuring transformer delta connection mode winding D.C. resistance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |