CN102946086A - Transformer protection realizing method based on multi-dimensional information - Google Patents
Transformer protection realizing method based on multi-dimensional information Download PDFInfo
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Abstract
The invention provides a transformer protection realizing method based on multi-dimensional information. The method comprises the steps of (1) acquiring interval information, substation area information and zone information that cover electrical equipment, (2) extracting characteristic dimensional information from spatial dimensional information, and (3) constructing a main protection criterion, a backup protection criterion and a transformer protection and stability control coordination strategy of a transformer with the multi-dimensional information. The method comprehensively utilizes fault information of spatial dimension and characteristic dimension to achieve a relay protection criterion, so that the adaptability and movement performance of a protective device are improved.
Description
Technical field
The invention belongs to field of relay protection in power, be specifically related to a kind of tranformer protection implementation method based on various dimensions information.
Background technology
Traditional relay protection is the single electric equipment of protection; the electric parameters that the protection criterion adopts only limits to the electric parameters of each side of protection component or a side; do not utilize the information of other elements of transformer station; when the protective device fault; need to utilize the backup protection excision faulty equipment of adjacent elements; because the backup protection performance is subjected to system operation mode; transition resistance; the impact of the factors such as fault moment; cooperate difficulty between the backup protection; the risk that has mismatch; utilize entirely the stand backup protection of information realization transformer of transformer station, can take full advantage of the redundant information of transformer station, identify fast abort situation; the excision fault element is simplified adjusting of traditional protection reserve section.
Tranformer protection when transformer overload, is sent out alarm signal take the protection transformer as main target at present, reminds the operations staff in time to adjust the transformer operational mode, avoids causing because of overload the harm of transformer.By delivering to stabilization control device on the overload information with transformer, utilize stability control device to carry out prevention and control, take to cut machine, cutting load measure, reduce the load of transformer, eliminate the overload phenomenon, can improve the automatization level of device, improve Systems balanth.
Transformer device structure is complicated; can produce a large amount of fault messages during fault; traditional tranformer protection adopts the establishing protective criterions such as electric current, voltage, gas density, oil pressure; by deep excavation fault signature; extract the component that characterizes fault, utilize these components to realize that protection philosophy can improve the performance of tranformer protection.
Fully utilize the fault message of different range, different characteristic, can improve the reliability of tranformer protection, by cooperating with stabilization control device, in time eliminating transformer overload improves Systems balanth simultaneously.
Summary of the invention
In order effectively to utilize fault message; promote the relaying protection performance; the invention provides a kind of tranformer protection implementation method based on various dimensions information; the fault message of comprehensive utilization Spatial Dimension and characteristic dimension; structure tranformer protection criterion, adaptability and the performance of raising protective device.
In order to understand better thought of the present invention, now the technical name that occurs among the present invention is illustrated or is defined as follows:
Spatial Dimension: be from the protection range angle; ascending; comprise respectively interval (single electric component), the territory of standing (whole transformer station) and zone (one or more transformer station), above-mentioned interval, stand territory and zone are referred to as Spatial Dimension.
Spatial Dimension information: comprise interval information, stand domain information and area information, the domain information of wherein standing comprises a plurality of interval information, and area information comprises one or more stations domain information, comprises simultaneously a plurality of interval information.
Interval information: the interval refers to single electric component, and interval information is the information that obtains from single electric component collection, and for transformer, interval information comprises the electric current that flows through each side of transformer, voltage, transformer temperature, gas density, oil pressure etc.
The domain information of standing: the information that gathers from all electric components of transformer station (comprising circuit, transformer, bus and reactor etc.).The domain information of standing comprises electric current, voltage, temperature, wherein, current acquisition has circuit both sides, each side of transformer, reactor both sides from the substation, voltage acquisition is from all buses of transformer station, and temperature acquisition has circuit, transformer, bus and reactor from the substation.
Area information: the one or more transformer stations of district inclusion, the area information collection has circuit, transformer, bus and reactor from substation that this zone comprises.Area information comprises electric current, voltage, temperature, and current acquisition is each circuit both sides in the zone, and voltage acquisition is each bus in the zone, and temperature acquisition is circuit, transformer and bus in the zone.
Characteristic dimension: refer to characterize the amount of fault signature, and can utilize it to realize protection philosophy.The information of characteristic dimension comprises electric current, voltage, direction, impedance, energy, frequency spectrum, oil pressure, oil level, gas, chromatogram.Electric current in the characteristic dimension information, voltage, direction, impedance, energy, frequency spectrum, temperature, oil pressure, oil level, gas, chromatogram are extracted from interval information.
The present invention specifically by the following technical solutions.
A kind of tranformer protection implementation method based on various dimensions information is characterized in that, described scheme may further comprise the steps:
(1) gathers the Spatial Dimension information relevant with transformer, described Spatial Dimension information comprises the interval information of protected transformer, the domain information of standing, area information, the domain information of wherein standing comprises a plurality of interval information, and area information comprises one or more stations domain information;
(2) from described each the Spatial Dimension information of step (1), extract the characteristic dimension information relevant with protected transformer, comprise electric current, voltage, direction, impedance, temperature, gas, oil pressure, chromatogram, current waveform etc.;
(3) utilize step (2) from the interval information of spatial transformer dimension, to extract the main protection of the protected transformer of characteristic dimension information structuring;
(4) backup protection that utilizes step (2) from the interval information of spatial transformer dimension and station domain information, to extract the protected transformer of characteristic dimension information structuring;
(5) utilize step (2) from the area information of spatial transformer dimension, to extract characteristic dimension information structuring tranformer protection and stable control coordination control strategy.
Compared with the prior art; the invention provides a kind of tranformer protection implementation method based on various dimensions information; the method can fully utilize Spatial Dimension and characteristic dimension realizes the protection criterion, improves the adaptability of tranformer protection criterion, the performance of lifting protection device.
Description of drawings
Fig. 1 is based on the tranformer protection scheme schematic diagram of multidimensional information;
Fig. 2 is the transformer protection method flow chart that the present invention is based on various dimensions information;
Fig. 3 is based on the tranformer protection flow chart of interval information;
Fig. 4 is based on the transformer backup protection flow chart of interval information and station domain information;
Fig. 5 is based on the tranformer protection and stable control cooperation flow chart of area information.
Embodiment
Be described in further detail below in conjunction with Figure of description and the specific embodiment technical scheme to the application.
The information of utilizing Spatial Dimension and characteristic dimension shown in Figure 1, the technical scheme schematic diagram of structure tranformer protection.Wherein Spatial Dimension information comprise the interval, the territory of standing, area information, characteristic dimension information comprises electric current, voltage, impedance, temperature, energy, waveform, gas density, oil pressure, chromatogram.Protective device can be realized main protection, backup protection, tranformer protection and stabilization control device Cooperation Strategy.
Figure 2 shows that the transformer protection method flow chart that the present invention is based on various dimensions information.The transformer protection method that the present invention is based on various dimensions information may further comprise the steps:
In a kind of preferred embodiment of the application, interval information and station domain information collection can be transmitted by the SV/GOOSE net, and area information can transmit by PMU.
Step 2, from described each the Spatial Dimension information of step 1, extract the characteristic dimension information relevant with protected transformer, comprise electric current, voltage, direction, impedance, temperature, gas, oil pressure, chromatogram, current waveform etc.
Step 3, utilize step 2 from the interval information of spatial transformer dimension, to extract the main protection of the protected transformer of characteristic dimension information structuring.The characteristic dimension information of extracting from the interval information of spatial transformer dimension comprises transformer current, gas density, transformer current waveform.
In preferred embodiment provided by the invention, described transformer main protection comprises current differential protection, protection and based on the protection of wave-form similarity, is the logical relation of "or" between three protection criterions.
The current differential protection criterion is
Wherein,
Be each side electric current of transformer, I
SetBe setting current, it is positive direction that the regulation bus points to transformer;
The protection criterion is ξ＞ξ
Set, wherein, ξ is the transformer gas density, ξ
SetBe the protection setting value;
Protection based on wave-form similarity is
Wherein x (n), y (n) are transformer both sides current sampling datas, and N is sampling number, ρ
SetBe wave-form similarity protection definite value.
The tranformer protection flow process that accompanying drawing 3 is depicted as interval information is:
(1) electric current of each side of transformer and gas density in the acquisition interval;
(2) calculate the current differential protection criterion
(
Be each side electric current of transformer, I
SetBe current ration), protection criterion (gas density is greater than setting value), wave-form similarity criterion
(x (n), y (n) are circuit both sides current sampling datas, ρ
SetBe the wave-form similarity setting value), when any satisfies operation condition in above three criterions, the main protection action; Otherwise, go to step 4.
Step 4, the backup protection that utilizes step 2 from the interval information of spatial transformer dimension and station domain information, to extract the protected transformer of characteristic dimension information structuring.
Described transformer backup protection comprises that transformer bay is every backup protection and the backup protection of transformer station territory.
Transformer bay utilizes the interval information of described spatial transformer dimension to realize every backup protection, the characteristic of transformer dimensional information of extracting from described interval information comprises transformer temperature, oil pressure, chromatogram, the impedance of each side energy of transformer, electric current, voltage, protection installation place; Described transformer bay comprises current protection criterion, voltage protection criterion, impedance protection criterion, protecting energy criterion and overload criterion every backup protection; be the logical relation of "or" between these five the protection criterions; arbitraryly in five criterions satisfy operation condition; transformer bay moves every backup protection, and five protection criterions are as follows respectively:
The current protection criterion is I＞I
Set, wherein I is transformer high, medium and low voltage side electric current, I
SetBe the current protection setting value, the high, medium and low voltage side is adjusted respectively;
The voltage protection criterion is U＜U
Set' wherein U be the voltage of transformer high, medium and low voltage side, U
SetBe the voltage protection setting value, the high, medium and low voltage side is adjusted respectively;
The impedance protection criterion is Z＜Z
Set' Z=U/I wherein, be the impedance of transformer high, medium and low voltage side, Z
SetBe the impedance protection setting value, the high, medium and low voltage side is adjusted respectively;
The protecting energy criterion is E＞E
Set' wherein
I (n) is the high, medium and low side current sampling data of transformer, and i (n) is sampled value, and I is phasor, and k is that current sample is counted E
SetBe the protecting energy setting value;
The overload protection criterion is utilized the temperature structure, is T＞T
Set' wherein T be transformer temperature, T
SetBe overload protection setting value;
Preferably, transformer bay can also comprise transformer oil pressure and chromatogram criterion every backup protection, when transformer oil pressure and chromatogram surpass setting value, sends out alarm signal.
The transformer backup protection also comprises the backup protection of transformer station territory.
The territory backup protection of described transformer station utilizes described spatial transformer dimension station domain information to realize, from the domain information of described station, extract the characteristic dimension information of each element of transformer station, the electric current, the voltage that comprise each element, the territory backup protection of structure transformer station, the territory backup protection of described transformer station comprise territory, station differential protection criterion;
The territory differential protection criterion of standing is
Wherein
For the electric current that flows out each branch road of transformer station and, m is for flowing out the branch road number of transformer station, I
Set2Be territory, station differential protection setting value, it is positive direction that the regulation bus points to circuit.
The territory backup protection of described station also needs the direction criterion of each bar circuit of transformer station and bus, that is:
When satisfying territory, station differential protection criterion, calculate the direction criterion of each bar circuit of transformer station and bus, the positive direction criterion is
Criterion is in the other direction
Wherein
Be the positive sequence voltage of respective lines or bus,
Forward-order current for respective lines or bus, when a certain circuit both sides are not satisfied the positive direction criterion simultaneously, and when each side of bus connection line does not satisfy the opposite direction criterion simultaneously, and a certain side electric current of transformer is greater than setting value, these three criterions formations " with " logic, be that these three criterions satisfy this side circuit breaker of tripping transformer simultaneously.
As a preferred embodiment among the application, the transformer backup protection flow chart that accompanying drawing 4 shows based on the station domain information.
(1) electric current and the voltage of each side of electric component in the collection transformer station.
(2) calculate
Wherein
For the electric current that flows out each branch road of transformer station and, m is for flowing out the branch road number of transformer station.
(3) if
I
Set2Be territory, station differential protection setting value, otherwise, go to (2);
(4) the direction criterion of each element of calculating transformer station, the positive direction criterion is
Criterion is in the other direction
Wherein
Be positive sequence voltage,
Be forward-order current
(5) do not satisfy simultaneously the positive direction criterion when the circuit both sides, and when each side of bus connection line does not satisfy the opposite direction criterion simultaneously, (side by side conditional relationship) and transformer high (in, low) side electric current is greater than setting value, tripping transformer high (in, low) side circuit breaker, otherwise, return (2).
Step 5, utilize step 2 from the area information of spatial transformer dimension, to extract characteristic dimension information structuring tranformer protection and stable control coordination control strategy.
Tranformer protection is specific as follows with stable control coordination control strategy:
Gather the temperature of each transformer in the protection zone, when certain transformer temperature T greater than specified operating temperature T
eWhen (transformer temperature that nominal load is corresponding), overload information (overload transformer, transformer temperature) is sent to stabilization control device, stabilization control device takes to cut machine, cutting load measure, if T＜T
Set' transformer overload protection returns, if T＞T
Set' transformer overload protection action.
Tranformer protection based on area information shown in Figure 5 with stable control cooperation flow process is:
(1) temperature of each transformer in the collection protection zone;
(2) when transformer temperature T greater than specified operating temperature T
eWhen (transformer temperature that nominal load is corresponding), overload information (overload transformer, transformer temperature) is sent to stabilization control device;
(3) stabilization control device takes to cut machine, cutting load measure;
(4) if T＞T
Set' transformer overload protection action, otherwise, go to (2);
What need statement is that content of the present invention and embodiment are intended to prove the practical application of technical scheme provided by the present invention, should not be construed as the restriction to protection range of the present invention.Those skilled in the art can do various modifications, be equal to and replace or improve inspired by the spirit and principles of the present invention.But these changes or modification are all in the protection range that application is awaited the reply.
Claims (8)
1. the tranformer protection implementation method based on various dimensions information is characterized in that, described scheme may further comprise the steps:
(1) gathers the Spatial Dimension information relevant with transformer, described Spatial Dimension information comprises the interval information of protected transformer, the domain information of standing, area information, the domain information of wherein standing comprises a plurality of interval information, and area information comprises one or more stations domain information;
(2) from described each the Spatial Dimension information of step (1), extract the characteristic dimension information relevant with protected transformer, comprise electric current, voltage, direction, impedance, temperature, gas, oil pressure, chromatogram, current waveform etc.;
(3) utilize step (2) from the interval information of spatial transformer dimension, to extract the main protection of the protected transformer of characteristic dimension information structuring;
(4) backup protection that utilizes step (2) from the interval information of spatial transformer dimension and station domain information, to extract the protected transformer of characteristic dimension information structuring;
(5) utilize step (2) from the area information of spatial transformer dimension, to extract characteristic dimension information structuring tranformer protection and stable control coordination control strategy.
2. the tranformer protection implementation method based on various dimensions information according to claim 1 is characterized in that:
In described step (3), the characteristic dimension information of extracting from the interval information of spatial transformer dimension according to step (2) comprises transformer current, gas density, transformer current waveform;
Described transformer main protection comprises current differential protection, distance protection and based on the protection of wave-form similarity, is the logical relation of "or" between three protection criterions.
3. the tranformer protection implementation method based on various dimensions information according to claim 2 is characterized in that:
The current differential protection criterion is
Wherein,
Be each side electric current of transformer, I
SetBe setting current, it is positive direction that the regulation bus points to transformer;
The protection criterion is: ξ＞ξ
Set, wherein, ξ is the transformer gas density, ξ
SetBe the protection setting value;
Protection criterion based on wave-form similarity is:
Wherein x (n), y (n)
Be transformer both sides current sampling data, ρ is transformer both sides current waveform similarities, and N is the current sample number, ρ
SetBe wave-form similarity protection definite value.4, the tranformer protection implementation method based on various dimensions information according to claim 1 and 2 is characterized in that:
In described step (4), described transformer backup protection comprises that transformer bay is every backup protection and the backup protection of transformer station territory.
4. the tranformer protection implementation method based on various dimensions information according to claim 3 is characterized in that:
Transformer bay utilizes the interval information of described spatial transformer dimension to realize every backup protection, the characteristic of transformer dimensional information of extracting from described interval information comprises transformer temperature, oil pressure, chromatogram, the impedance of each side energy of transformer, electric current, voltage, protection installation place; Described transformer bay comprises current protection criterion, voltage protection criterion, impedance protection criterion, protecting energy criterion and overload criterion every backup protection; the high, medium and low rear flank of transformer is standby all adopts these five to protect criterions; be the logical relation of "or" between these five the protection criterions; arbitraryly in five criterions satisfy operation condition; transformer bay moves every backup protection, and five protection criterions are as follows respectively:
The current protection criterion is I＞I
Set, wherein I is transformer high, medium and low voltage side electric current, I
SetBe the current protection setting value, the high, medium and low voltage side is adjusted respectively;
The voltage protection criterion is U＜U
Set, wherein U is the voltage of transformer high, medium and low voltage side, U
SetBe the voltage protection setting value, the high, medium and low voltage side is adjusted respectively;
The impedance protection criterion is Z＜Z
Set, wherein Z=U/I is the impedance of transformer high, medium and low voltage side, Z
SetBe the impedance protection setting value, the high, medium and low voltage side is adjusted respectively;
The protecting energy criterion is E＞E
Set' wherein
I (n) is the high, medium and low side current sampling data of transformer, and i (n) is sampled value, and I is phasor, and k is that current sample is counted E
SetBe the protecting energy setting value;
The overload protection criterion is utilized the temperature structure, is T＞T
Set' wherein T be transformer temperature, T
SetBe overload protection setting value;
When transformer oil pressure and chromatogram surpass setting value, send out alarm signal.
5. the tranformer protection implementation method based on various dimensions information according to claim 3 is characterized in that:
The territory backup protection of described transformer station utilizes described spatial transformer dimension station domain information to realize, from the domain information of described station, extract the characteristic dimension information of each element of transformer station, the electric current, the voltage that comprise each element, the territory backup protection of structure transformer station, the territory backup protection of described transformer station comprise territory, station differential protection criterion;
The territory differential protection criterion of standing is
Wherein
For the electric current that flows out each branch road of transformer station and, m is for flowing out the branch road number of transformer station, I
Set2Be territory, station differential protection setting value, it is positive direction that the regulation bus points to circuit.
6. the tranformer protection implementation method based on various dimensions information according to claim 5 is characterized in that:
The direction criterion of each bar circuit of transformer station and bus is also further protected in the territory backup protection of described station, that is:
When satisfying territory, station differential protection criterion, calculate the direction criterion of each bar circuit of transformer station and bus, the positive direction criterion is
Criterion is in the other direction
Wherein
Be the positive sequence voltage of respective lines or bus,
Forward-order current for respective lines or bus, when a certain circuit both sides are not satisfied the positive direction criterion simultaneously, and when each side of bus connection line does not satisfy the opposite direction criterion simultaneously, and a certain side electric current of transformer is greater than setting value, these three criterions consist of together " with " logic, be that these three criterions satisfy this side circuit breaker of tripping transformer simultaneously.
7. it is characterized in that according to claim 1 and 2 or 3 or 4 or 5 or 6 described tranformer protection implementation methods based on various dimensions information:
In described step (5), tranformer protection is as follows with stable control Cooperation Strategy:
Gather the temperature of each transformer in the protection zone, when transformer temperature T greater than specified operating temperature T
eThe time, overload information is sent to stabilization control device, stabilization control device takes to cut machine, cutting load measure, if T＜T
Set' transformer overload protection returns, if T＞T
Set' transformer overload protection action.
8. according to claim 1 to 7 arbitrary described tranformer protection implementation methods based on various dimensions information, it is characterized in that:
In described step (1), interval information and station domain information collection are transmitted by the SV/GOOSE net, and area information can transmit by PMU.
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| CN104484702A (en) * | 2014-12-17 | 2015-04-01 | 镇江市高等专科学校 | Method for identifying protection state of multi-feature-criterion power transformer |
| CN112865018A (en) * | 2021-01-08 | 2021-05-28 | 河海大学 | Method for protecting multi-end convergence transformer of energy storage power station |
| CN113036729A (en) * | 2021-04-12 | 2021-06-25 | 华中科技大学 | Differential protection method, device and system based on Euclidean distance and pearson similarity |
| CN114166268A (en) * | 2021-10-13 | 2022-03-11 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Transformer fault detection method and device and electronic equipment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104484702A (en) * | 2014-12-17 | 2015-04-01 | 镇江市高等专科学校 | Method for identifying protection state of multi-feature-criterion power transformer |
| CN104484702B (en) * | 2014-12-17 | 2017-02-22 | 镇江市高等专科学校 | Method for identifying protection state of multi-feature-criterion power transformer |
| CN112865018A (en) * | 2021-01-08 | 2021-05-28 | 河海大学 | Method for protecting multi-end convergence transformer of energy storage power station |
| CN113036729A (en) * | 2021-04-12 | 2021-06-25 | 华中科技大学 | Differential protection method, device and system based on Euclidean distance and pearson similarity |
| CN113036729B (en) * | 2021-04-12 | 2022-07-12 | 华中科技大学 | Differential protection method, device and system based on Euclidean distance and pearson similarity |
| CN114166268A (en) * | 2021-10-13 | 2022-03-11 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Transformer fault detection method and device and electronic equipment |
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