CN103605041B - 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
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- CN103605041B CN103605041B CN201310565336.8A CN201310565336A CN103605041B CN 103605041 B CN103605041 B CN 103605041B CN 201310565336 A CN201310565336 A CN 201310565336A CN 103605041 B CN103605041 B CN 103605041B
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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 substation current transformer secondary circuit multipoint earthing detection method and its
System, belongs to technical field of electric power automation.
Background technology
In power system, secondary circuit plays very important effect to safeguards system safe and stable operation, and system is just
Often under the method for operation, in order to ensure the safety of the person and equipment, " the great anti-accident measures of 18 electrical networks of State Grid Corporation of China ",
One electrical connection of " electric operating site safety code " rated current transformer secondary circuit must have one reliably to connect
Place.Simultaneously in order to ensure relay protection and automatic safety device correct work it is desirable in current loop only one of which ground connection
Point.But because transformer station's electric current secondary loop often connects multiple equipment, expanded range is wide, usually due to artificial wiring error
Or, multiple earth points in the electric current secondary loop of an electrical connection, multiple spot connects in the reasons such as secondary circuit insulation ag(e)ing
Ground leads to bus protection, main transformer protection, the accident of route protection incorrect operation to occur repeatedly.
Secondary loop of mutual inductor multipoint earthing has two kinds of situations: 1) neutral conductor multipoint earthing；2) protection device both sides
Multipoint earthing, multipoint earthing mode (as shown in Figure 1).
As shown in figure 1, r1, r2, r3 are respectively protection device abc three-phase sampling circuit substitutional resistance.Under normal circumstances, ta
Second loop grounding point one and only one, in ct root or indoor in protection, in FIG, there is earth point and be connected to sealer
The interior mode of connection.1. analog current loop neutral conductor multipoint earthing and two kinds of ground connection feelings of protection both sides multipoint earthing, are 2. distinguished
Condition.
When neutral conductor two points ground fault, due to grounding net of transformer substation not actual equipotential plane, difference meeting
Certain potential difference occurs, potential difference will scurry into secondary loop of mutual inductor, especially when occur in grounded screen short circuit current or
During thunder-strike current, cable shield difference current potential is different, makes to flow through electric current in screen layer, may burn out screen layer, and to two
Minor loop produces interference.
For protection device both sides multipoint earthing point situation, if grounding net of transformer substation is isoelectric level net (i.e. between earth point
No potential difference), the shunt circuit of two earth points and earth mat composition can cause secondary loop current to shunt so that flowing through protection device
Sampling circuit electric current greatly reduces.If grounding net of transformer substation is non-isoelectric level net, between the earth point of protection device both sides, there is electricity
Potential difference, then the electric current that potential difference causes flows through protection device, so that protection device is sampled incorrect.
Above-mentioned analysis understands, secondary loop of mutual inductor multipoint earthing can be adopted to protection device or automatic safety device
Sample produces impact, and then affects the action behavior of protection device.
Substation field checks that the method for multipoint earthing mainly removes former earth point at present, electric over the ground by measuring loop
Hinder and to determine whether there is multipoint earthing phenomenon.Related article it is also proposed the detection method of other current loop multipoint earthings,
Multipoint earthing as a kind of method measure loop of utilization low-voltage ac signal injection.This method is simply effective, can be accurate rapidly
Multipoint earthing phenomenon really is detected, however it is necessary that sealing in low-voltage signal generating meanss in former loop, being not suitable for pushing away on a large scale
Extensively, especially for the transformer station having put into operation.Therefore necessary research is a kind of not to change the contactless of primary current loop
Multipoint earthing detection method.
Content of the invention
For not enough present on prior art, it is an object of the present invention to provide a kind of based on Faraday law of electromagnetic induction
Contactless transformer substation current transformer secondary circuit multipoint earthing detection method, and build non-contact type current loop multiple spot and connect
Ground detecting system, on the premise of can guarantee that normal operation does not produce impact on protection device using this detection method, examines effectively
Measure whether secondary loop of mutual inductor occurs multipoint earthing.
To achieve these goals, the present invention is to realize by the following technical solutions:
A kind of non-contact type current transformer secondary circuit multipoint earthing detection method, fixed based on faraday electromagnetic induction
Rule, its method is: the injection of (1) non-contact type signal；Apply the vertical and neutral conductor in the secondary loop of mutual inductor neutral conductor
Variation magnetic field, make to produce the magnetic flux of change in the neutral conductor, realize non-contact type signal injection；
(2) judging whether produce electric current on the neutral conductor, if producing electric current, being multipoint earthing；Otherwise it is one point earth.
In above-mentioned steps (1), the described neutral conductor installs signal injected system, so that it is produced by signal injected system
The variation magnetic field of the vertical and neutral conductor.
Described signal injected system includes can the pliers iron core of folding, the coil being arranged on pliers iron core and connect coil
Ac current source, coil connect ac current source, the magnetic flux of alternation can be excited in iron core by the alternating current of coil,
Described pliers iron core vertical clamping, on the neutral conductor, makes to apply vertical and neutral conductor change magnetic field on the neutral conductor.
In above-mentioned steps (1), in pliers iron core vertical clamping before the neutral conductor, confirm that ac current source signal output is
Zero, frequency configuration is numerical value m, 0 ＜ m≤50 hertz；Then, by pliers iron core vertical clamping on the neutral conductor, it is gradually increased exchange
Current source output current, makes to produce magnetic flux in the neutral conductor.
In above-mentioned steps (2), for judging whether the electricity that electric current is by observing current collecting device is produced on the neutral conductor
The change of fluxion value, if current values are zero always, the numerical value that outputs current to of current source of increasing exchanges further is n, wherein,
05 amperes of ＜ n ＜, increase power frequency to numerical value is l simultaneously, wherein, and l≤150hz, if being still not detected by electric current, judge two
There is not multipoint earthing phenomenon in minor loop；
If increasing with current source output current, current collecting device detects electric current to be increased, then continue electricity of increasing exchanges
Current values measured by until data processing and the detection of multipoint earthing criterion system for the output current in stream source are more than or equal to
10ma, hereafter, should be m(using the measured power frequency of data processing and the detection of multipoint earthing criterion system conversely, then again
Detection), now, it is gradually reduced the output current of ac current source, increase power frequency numerical value to 2m simultaneously, now recycle number
Should be 2m(according to the numerical value of the measured power frequency of process and the detection of multipoint earthing criterion system conversely, then again detecting), then
Determine that loop has multipoint earthing phenomenon, and warning signal is sent by data processing and multipoint earthing criterion system.
Preferably, described signal pickup assembly uses high-precision current split-core type meter in fact, it is easy to use, improve collection
Precision.
A kind of contactless secondary loop of mutual inductor multipoint earthing detecting system, comprising:
Signal injected system, is arranged on the neutral conductor of transformer substation current transformer secondary circuit, for into the neutral conductor
Apply vertical and the neutral conductor variation magnetic field；
Signal pickup assembly, is arranged on the neutral conductor of transformer substation current transformer secondary circuit, for gathering the neutral conductor
On whether produce electric current；
Data processing and multipoint earthing criterion system, are connected with signal pickup assembly, for receipt signal harvester
The collection information sent into, and data analysiss and multipoint earthing differentiation are carried out according to collection information, according to the criterion of setting in system
Logical sum definite value discriminates whether multipoint earthing, and sending warning signal, to judge whether secondary loop of mutual inductor occurs many
Point ground connection.
Further, described data processing and multipoint earthing criterion system are according to the decision logic of setting and definite value in system
To discriminate whether multipoint earthing, if multipoint earthing send warning signal.
Differentiated according to the decision logic of setting in data processing and multipoint earthing criterion system and definite value, that is, work as alternating current
The output current in source is 5a, when output current frequency increases to 150hz, if data processing and the inspection of multipoint earthing criterion system simultaneously
Survey measured neutral current numerical value still less than 10ma, then judge multipoint earthing, if during n and m increases, number
Reach 10ma according to the neutral current numerical value processing and the detection of multipoint earthing criterion system is measured, then judged to there occurs multiple spot
Ground connection, and send warning signal；Data processing and multipoint earthing criterion function are exactly the work(that current acquisition and size of current differentiate
The controller of energy, it is embodied as prior art.
Described signal injected system includes can the pliers iron core of folding, the coil being arranged on pliers iron core and connect coil
Ac current source, coil connect ac current source, the magnetic flux of alternation can be excited in iron core by the alternating current of coil,
Described pliers iron core vertical clamping, on the neutral conductor, makes to apply vertical and neutral conductor change magnetic field on the neutral conductor.
As preferential, described ac current source uses single-phase relay protection tester.
Non-contact type current secondary circuit multipoint earthing detection method of the present invention and the structure of detection platform, by secondary
Apply the magnetic field of change in the neutral conductor of loop, based on Faraday law of electromagnetic induction, judge in the neutral conductor, whether have electric current to produce,
When only there is two points ground fault in secondary circuit, in the neutral conductor, just can produce electric currentIf loop only has one point earth, will not shape
Become electric current, transformer station can be conveniently used for and check the judgement of secondary loop of mutual inductor multipoint earthing it is ensured that to protection device just
On the premise of often operation does not produce impact, effectively detect whether secondary loop of mutual inductor occurs multipoint earthing.
Brief description
To describe the present invention with reference to the accompanying drawings and detailed description in detail；
Fig. 1 is existing current transformer multipoint earthing schematic diagram；
Fig. 2 is the neutral conductor multipoint earthing schematic diagram of the present invention；
Fig. 3 is the protection both sides multipoint earthing schematic diagram of the present invention；
Fig. 4 is the non-contact type current secondary circuit multipoint earthing detecting system of the present invention；
Fig. 5 is the equivalent circuit of the non-contact type current secondary circuit multipoint earthing detecting system of the present invention；
Fig. 6 is non-contact type current secondary circuit multipoint earthing overhaul flow chart of the present invention.
Specific embodiment
Technological means, creation characteristic, reached purpose and effect for making the present invention realize are easy to understand, with reference to
Specific embodiment, is expanded on further 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-connecing
Touch current loop multipoint earthing detecting system；It is Faraday law of electromagnetic induction, neutral in secondary loop of mutual inductor
Apply vertical and the neutral conductor variation magnetic field in line, make in the neutral conductor, to produce the magnetic flux of change, realize non-contact type signal note
Enter；Then judging whether produce electric current on the neutral conductor, if producing electric current, being multipoint earthing；Otherwise it is one point earth.This enforcement
Being embodied as of example is as follows:
1. the non-contact type signal method for implanting based on electromagnetic induction；
Referring to Fig. 2 and Fig. 3, according to Faraday law of electromagnetic induction, the change of magnetic flux in wire loop can be returned in wire
Induction electromotive force is produced, magnetic flux change must be faster, and induction electromotive force is bigger in road.
The loop of bis- multipoint earthings of current transformer ta can be considered as wire loop, applies the magnetic changing in the loop
, can produce induction electromotive force, realize AC signal injection.In formula,For induction electromotive force,For change
Magnetic flux,For loop substitutional resistance,For loop current.
In figs. 2 and 3, in the case of which show two kinds of multipoint earthings of ta secondary circuit, using faraday electromagnetic induction
Law realizes the method schematic diagram of signal injection.As seen from the figure, when only there is two points ground fault in secondary circuit, in the neutral conductor
Electric current can be producedIf loop only has one point earth, electric current will not be formed, can judge that loop whether there is multiple spot and connects accordingly
Ground.
Apply the magnetic field changing in the secondary circuit neutral conductor, you can realize contactless signal injection.Based on electric power
The operation principle of transformator, the alternating current of primary coil can excite the magnetic flux of alternation in iron core, by the ferrum of current transformer
Core is made and can be formed jaw type iron core with the pliers of folding, by jaw type iron core clamp on the ta secondary circuit neutral conductor, can be in neutrality
The magnetic flux of change is produced, thus realizing the non-contact type signal injection of multipoint earthing loop in line.
2. contactless multipoint earthing detects implementation method；
As shown in figure 4, realizing the premise that the injection of multipoint earthing loop non-contact type signal source is by multipoint earthing detection,
Present embodiments provide a kind of non-contact type current loop multipoint earthing detecting system of electromagnetic induction, including three parts: signal
Injected system, signal pickup assembly data are processed and ground connection criterion system.
Signal injected system is made up of jaw type iron core and ac current source, jaw type iron core is provided with coil, by coil
With ac current source, the ac current source of the present embodiment uses single-phase relay protection tester.This ac current source produces
The adjustable electric current of frequency-invariant, as the primary coil winding n circle of jaw type iron core, jaw type iron core is in former limit line for this current loop
The lower magnetic flux producing steady change of loop current effect.The ta secondary circuit neutral conductor constitutes closed-loop path with other earth points, makees
For the secondary coil of jaw type iron core, according to Faraday law of electromagnetic induction, induction electromotive force can be produced in secondary coil, and flow through
Electric current.
In this enforcement, signal pickup assembly uses high-precision current split-core type meter, and it collects the electric current in the neutral conductor,
And send into data processing and multipoint earthing criterion system carries out data analysiss and multipoint earthing differentiates, according to the sentencing of setting in system
Discriminating whether multipoint earthing according to logical sum definite value, if there is multipoint earthing, sending warning signal.
In the present embodiment, differentiated according to the decision logic of setting in data processing and multipoint earthing criterion system and definite value,
Its discriminant approach is: when the output current of ac current source is 5a, when output current frequency increases to 150hz, if data simultaneously
Process and multipoint earthing criterion system detects that measured neutral current numerical value still less than 10ma, then judges not occurring multiple spot to connect
Ground, if during the output current of ac current source and power frequency increase, data processing and multipoint earthing criterion system are examined
Survey measured neutral current numerical value and reached 10ma or more than 10ma, then judge to there occurs multipoint earthing, and send alarm
Signal；The controller of the function that data processing and multipoint earthing criterion function are exactly current acquisition and size of current differentiates, in fact
It is now prior art, now not in addition burden.
The jaw type iron core of a whole set of contactless multipoint earthing detecting system requires easily to clamp in current loop neutrality
So that the magnetic field energy that ac current source produces in jaw type iron core passes through the neutral conductor on line, and there is good magnetic property.Number
According to processing and being grounded criterion system, the secondary current (neutral current) of collection is analyzed calculating, fixed according to the electric current setting
Value criterion judges whether multipoint earthing phenomenon.
3. the theory analysis of multipoint earthing detection method
The reliability and feasibility setting up the detection method to contactless multipoint earthing for the corresponding mathematical model strictly divides
Analysis, ground loop resistance, the position of iron core excitation property, jaw type iron core and the neutral conductor all can have influence on final testing result.
Contactless multipoint earthing detecting system operation principle is similar to ideal transformer, and jaw type iron core can regard preferable as
The field core of transformator, the current loop that ac current source is wound around regards primary coil as, and the neutral conductor and other earth points are formed
Earth-return circuit regard secondary coil as, its equivalent circuit is as shown in Figure 4.
According to transformer working principle, when not considering iron core iron loss, leakage field,, i.e. former secondary electricity
Flow ratio value and coil turn are inversely proportional to.
Although contactless multipoint earthing detecting 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 of completely closed iron core, and magnetic property is poor compared with transformer core；
2) the possible area of secondary circuit that neutral earthing point and other earth points are constituted is very big, its space being subject to as secondary coil
Magnetic interference is very big.
The secondary current of contactless multipoint earthing detecting system can be calculated according to Faraday law of electromagnetic induction,
Secondary coil is regarded as a wire loop plane, primary current produces the magnetic flux of change in the core, meeting in secondary coil
Produce induction electromotive force.If,Virtual value for main flux in iron core is it is assumed that jaw type iron core vertical folder
On the neutral conductor, then in secondary coil, induced voltage is:
(1)
Secondary coil electric current is:
(2)
Magnetic flux in iron coreProduced by former limit current-carrying coil, for ease of analysis it is assumed that primary coil is circular coil,
Current-Carrying Circular Coil is in the magnetic field intensity in the center of circle, whereinFor the pcrmeability of iron core,For electric current in primary coil,For
The radius of former limit circular coil.If,
Then(3)
WhereinFor the sectional area of jaw type iron core,For primary current virtual value, formula (3) is substituted in (2), secondary can be obtained
Coil current is:
(4)
Can be seen that secondary coil during multipoint earthing by (4) formula is electric current in neutral return pathSize and iron core magnetic conductance
Rate, primary current frequency, primary current virtual value, core section amassIt is directly proportional, and and ground loop resistanceWith former
Side coil radiusIt is inversely proportional to.When ta secondary circuit only has one point earth,,；During multipoint earthing,
, detectionSize can discriminate whether there is multipoint earthing phenomenon.
4th, non-contact type current transformer secondary circuit multipoint earthing detection specific implementation method is as follows:
When there is multipoint earthing in loop, the method injected by non-contact type signal, truly have electric current to produce in the neutral conductor
Raw, non-contact type current loop multipoint earthing detection basic skills be in detection neutral return path the presence or absence of electric current judging whether
Occur in that multipoint earthing.
Multipoint earthing method of discrimination is simple, but how true the current ration still needing to be considered as criterion during practical operation is
Fixed.Consider current clamp meter accuracy and protection device is affected, current ration is set to 10ma by the present embodiment.Most of at present
High-precision electric current split-core type meter can accurately measure the electric current of 10ma, and this electric current also will not produce big impact to protection sampling simultaneously.
Do not know in loop, whether there is multipoint earthing due to before test, ground loop resistance size is unknown, therefore can not be straight
Connect injection high current, high-frequency signal, in case exist multipoint earthing and loop resistance less when,Excessive cause protection device
Malfunction.Through research, as shown in figure 5, non-contact type current transformer secondary circuit multipoint earthing detection method, concrete steps are such as
Under:
(1) in pliers iron core vertical clamping before the neutral conductor, confirm that ac current source signal output is 0, frequency configuration is
Numerical value 50hz；
(2) and then by pliers iron core vertical clamping on the neutral conductor, it is gradually increased ac current source output current, makes neutrality
Produce magnetic flux in line, and electric current split-core type meter on the neutral conductor for the moment concern pincers is the current values of signal pickup assemblyBecome
Change；If=0, that is, current values are zero always, and the numerical value that outputs current to of current source of increasing exchanges further is 5a, increases simultaneously
Plus power frequency is up to 150hz, if being still not detected by electric current, that is, neutral current is still zero, then judge in secondary circuit not
There is multipoint earthing phenomenon；If, then enter step (3).
(3) if increasing with current source output current, current collecting device detects electric current to be increased, then continue to increase exchanges
The numerical value that outputs current to of current source is more than 10ma, now, is detected measured using data processing and multipoint earthing criterion system
Electric currentFrequency should be 50hz；First judges can there is multipoint earthing phenomenon in primitive decision loop.
(4) on the basis of the above, suitably it is gradually reduced the output current amplitude of ac current source, improve output current simultaneously
Frequency values are to guaranteeing during 100hz(It is not more than 20ma), finally recycle data processing and the inspection of multipoint earthing criterion system
Survey and detectedFrequency should be 100hz(if not then again detecting) it is determined that there is multipoint earthing phenomenon in loop, and by number
Send warning signal according to process and multipoint earthing criterion system.Can determine in loop in conjunction with current amplitude criterion and frequency criterion
With the presence of multipoint earthing phenomenon.
Applicable cases
The non-contact type current loop multipoint earthing detection method proposing in the present embodiment has carried out testing in laboratory
Card, tests as shown in Figure 5 in labs, and current source is provided by single-phase relay protection tester, and iron core is current transformer
Iron core used, vice-side winding is using the cable loop sealing in adjustable resistance.By experimental verification the feasibility of said method and
The correctness of theory analysis, result of the test shows, be can guarantee that using this detection method and does not produce shadow to the normal operation of protection device
On the premise of sound, effectively detect whether secondary loop of mutual inductor occurs multipoint earthing, transformer station's inspection can be conveniently used for
Look into sentencing of secondary loop of mutual inductor multipoint earthing.
Ultimate principle and principal character and the advantages of the present invention of the present invention have been shown and described above.The technology of the industry
, it should be appreciated that the present invention is not restricted to the described embodiments, the simply explanation described in above-described embodiment and description is originally for personnel
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes
Change and improvement both falls within scope of the claimed invention.Claimed scope by appending claims and its
Equivalent thereof.
Claims (3)
1. a kind of non-contact type current transformer secondary circuit multipoint earthing detection method, based on Faraday law of electromagnetic induction,
The steps include: that (1) non-contact type signal injects；Apply the change perpendicular to the neutral conductor in the secondary loop of mutual inductor neutral conductor
Magnetizing field, makes to produce the magnetic flux of change in the neutral conductor, realizes non-contact type signal injection；
(2) judging whether produce electric current on the neutral conductor, if producing electric current, being multipoint earthing；Otherwise it is one point earth；
In above-mentioned steps (1), the described neutral conductor installs signal injected system, so that it is produced vertically by signal injected system
Variation magnetic field in the neutral conductor；Described signal injected system includes can the pliers iron core of folding, the line being arranged on pliers iron core
Circle and the ac current source connecting coil, coil connects ac current source, by the meeting in pliers iron core of the alternating current of coil
Excite the magnetic flux of alternation, described pliers iron core vertical clamping is on the neutral conductor so as to apply perpendicular to the neutral conductor on the neutral conductor
The magnetic field of change；
In above-mentioned steps (1), in pliers iron core vertical clamping before the neutral conductor, confirm that ac current source signal output is zero, frequently
Rate is set to numerical value m, 0 ＜ m≤50 hz；Then, by pliers iron core vertical clamping on the neutral conductor, it is gradually increased alternating current
Source output current, makes to produce magnetic flux in the neutral conductor；
In above-mentioned steps (2), for judging whether the electric current number that electric current is by observing current collecting device is produced on the neutral conductor
The change of value, if current values are zero always, the numerical value that outputs current to of current source of increasing exchanges further is n, wherein, 0 ＜ n
5 amperes of ＜, increase power frequency to numerical value is l simultaneously, wherein, and l≤150hz, if being still not detected by electric current, judge secondary returning
There is not multipoint earthing phenomenon in road；
If increasing with current source output current, current collecting device detects electric current to be increased, then continue current source of increasing exchanges
Output current be more than or equal to 10ma until data processing and the measured current values of multipoint earthing criterion system detection, this
When, it is m using the measured power frequency of data processing and the detection of multipoint earthing criterion system, then, be gradually reduced alternating current
The output current in stream source, increases power frequency numerical value to 2m simultaneously, now recycles data processing and multipoint earthing criterion system
If the numerical value 2m of the measured power frequency of detection is it is determined that there is multipoint earthing phenomenon in loop, and by data processing and
Multipoint earthing criterion system sends warning signal；
Current collecting device, is arranged on the neutral conductor of transformer substation current transformer secondary circuit, for gathering on the neutral conductor is
No generation electric current；
Data processing and multipoint earthing criterion system, are connected with current collecting device, send into for receiving current collecting device
Collection information, and data analysiss and multipoint earthing carried out according to collection information differentiate, electricity is differentiated according to decision logic and definite value
Whether current transformer secondary circuit there is multipoint earthing, if multipoint earthing, then sends warning signal and judges.
2. a kind of non-contact type current transformer secondary circuit multipoint earthing detecting system, comprising:
Signal injected system, is arranged on the neutral conductor of transformer substation current transformer secondary circuit, for applying into the neutral conductor
Variation magnetic field perpendicular to the neutral conductor；
Current collecting device, is arranged on the neutral conductor of transformer substation current transformer secondary circuit, for gathering on the neutral conductor is
No generation electric current；
Data processing and multipoint earthing criterion system, are connected with current collecting device, send into for receiving current collecting device
Collection information, and data analysiss and multipoint earthing carried out according to collection information differentiate, electricity is differentiated according to decision logic and definite value
Whether current transformer secondary circuit there is multipoint earthing, if multipoint earthing, then sends warning signal and judges；
Described current collecting device uses high-precision current split-core type meter；Described signal injected system include can folding pliers ferrum
Core, the coil being arranged on pliers iron core and the ac current source connecting coil, coil connects ac current source, by coil
Alternating current can excite the magnetic flux of alternation in pliers iron core, and described pliers iron core vertical clamping, on the neutral conductor, makes neutrality
Magnetic field perpendicular to neutral conductor change is applied on line.
3. non-contact type current transformer secondary circuit multipoint earthing detecting system according to claim 2, its feature exists
In described ac current source uses single-phase relay protection tester.
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| CN106772192A (en) * | 2016-12-12 | 2017-05-31 | 国家电网公司 | Secondary Circuit of Potential Transformer multipoint earthing detection means |
| 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 |
| 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 |
| CN115811035B (en) * | 2023-01-29 | 2023-07-25 | 国网山西省电力公司电力科学研究院 | Device and method for selecting optimal current limiting impedance of multipoint grounding current of transformer core |
| CN116087866B (en) * | 2023-04-11 | 2023-07-28 | 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 |
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