CN106451353A - Protection scheme for multiple transformers - Google Patents
Protection scheme for multiple transformers Download PDFInfo
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- CN106451353A CN106451353A CN201611179920.XA CN201611179920A CN106451353A CN 106451353 A CN106451353 A CN 106451353A CN 201611179920 A CN201611179920 A CN 201611179920A CN 106451353 A CN106451353 A CN 106451353A
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- protection
- transformator
- transformers
- transformer
- protection device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Protection Of Transformers (AREA)
Abstract
The invention discloses a protection scheme for multiple transformers, belonging to the technical field of power system protection. According to the protection scheme, a plurality of transformers and protection devices are arranged, wherein the number of the protection devices is greater than that of the transformers and is smaller than two times that of the transformers; current data of high voltage sides and low voltage sides of the transformers, which is acquired by a current inducer, is transmitted to a shared switch through a combining unit; and the current data is transmitted to different protection devices which are connected with the switch in a broadcast mode. The protection devices are in mutual communication and cooperation, when at least two transformers are operated simultaneously, a part of the protection devices correspondingly protect one transformer, protection of the transformers is shared by other protection devices with the number exceeding that of the transformers, and thus dual protection of all the transformers can be achieved; and when only one transformer is operated, the operated transformer is protected by all the protection devices, and thus multi-protection of the operated transformer can be achieved. By adopting the protection scheme, the protection cost can be lowered, and meanwhile the protection reliability can be improved.
Description
Technical field
The present invention relates to technical field of electric system protection, specifically, particularly to a kind of multiple transformers protection scheme.
Background technology
Transformer station is the key node of the transmission of power system electric energy and conversion, is wherein configured with a large amount of primary equipments and secondary
Equipment.Wherein primary equipment includes transformator, bus, chopper, circuit, potential and current transformers etc..Secondary device includes
Various protections and supervising device.Existing transforming plant protecting designs according to distributed principle, be divided into tranformer protection, bus protection,
Route protection etc..
In a transformer station, typically at least two transformators, during ensureing when a transformer fault or to overhaul, also
Another transformator is had to keep supplying to important load (such as I and II load) and most of load (typically no less than 60%)
Electricity., each protection equipment for transformer is only a transformator service, and every taking 220kV and ratings above tranformer protection as a example
Individual transformator needs dual to protect, to ensure that also have another one protection device to provide protects in a protection device fault
Shield.Fig. 1 is existing dual transformer dual protection philosophy schematic diagram, as shown in figure 1, comprising two transformators in transformer station,
Transformator #1 and transformator #2, wherein, the protection device of transformator #1 is protection 1A and protection 1B, the protection device of transformator #2
It is protection 2A and protection 2B.Because transformator adopts differential protection, therefore, each protection device is required for from corresponding transformator height
Current signal is obtained in the current transformer of low pressure both sides.Although existing protection scheme improves the reliability of protection, effectively anti-
Only relay fail, but shortcoming to be cost very high, and due to leading to secondary connection complicated protection device quantity more, secondary circuit band
The malfunction outstanding problem coming.
Content of the invention
In view of the foregoing, it is an object to provide a kind of multiple transformers protection scheme, using intelligent substation
Communication network and switch, realize the duplicate protection of each transformator, reduces cost, solve existing protection scheme relatively costly
Problem.
To achieve these goals, the present invention employs the following technical solutions：
Multiple transformers protection scheme of the present invention, including multiple stage transformator, the high-pressure side of every transformator and low-pressure side
Respectively it is configured with electronic current mutual inductor, electronic current mutual inductor gathers the high-pressure side of transformator and low-pressure side respectively
Current data, current data is sent to a shared switch through combining unit, shared switch is with broadcast mode
It is sent simultaneously to each protection device being connected with switch, wherein, the quantity of protection device is more than the quantity of transformator, is less than
The quantity of the transformator of twice；
When in multiple stage transformator, at least two transformators run simultaneously, all corresponding one change of protection of part protection device
Depressor, remaining protection device having more number transformer shares the protection of all transformators jointly, realizes the double of all transformators
Change protection again；When only having transformer station high-voltage side bus in transformator described in multiple stage, all protection devices are protected simultaneously and to be run
Transformator, realizes the multiple protective of institute's operating transformer.
Preferably, when protecting the number of protection device of same transformator to be even number, then protection device is according to each
Differentiation result Independent Decisiveness whether trip；When protecting the number of protection device of same transformator to be odd number, each guarantor
Protection unit all receives the differentiation result of remaining protection device, and puts to the vote so that the minority is subordinate to the majority, decides whether to trip.
Preferably, described multiple transformers protection scheme, including two transformators, transformator #1 and transformator #2, and is two
Platform transformator arranges three protection devices, protects 1, protection 2 and protection 3, two high voltage side of transformers and low-pressure side to be configured with altogether
Four electronic current mutual inductors, electronic current mutual inductor gathers the current data of high voltage side of transformer and low-pressure side, by electricity
Flow data is sent to a shared switch through combining unit, and shared switch is sent simultaneously to protect with broadcast mode
1st, protection 2 and protection 3；
When transformator #1 and transformator #2 runs simultaneously, the corresponding protection transformator #1 of protection 1, the corresponding protection of protection 2 becomes
Depressor #2, transformator #1 and transformator #2 is protected in protection 3 simultaneously；As transformator #1 or transformator #2 isolated operation, protection
1st, run transformator is protected in protection 2 and protection 3 simultaneously.
Further, it is preferable to, the protection device of same transformator of protection adopts different principles to identify excitation surge current,
So that protection philosophy is complementary, prevent protection device misoperation.
Preferably, when transformator #1 and transformator #2 runs simultaneously, the protection device of same transformator of protection is according to each
From differentiation result Independent Decisiveness whether trip.
Preferably, transformator #1 or during transformator #2 isolated operation, each protection device all receives other two protection
The differentiation result of device, and carry out two from three voting, decide whether to trip.
Further, before voting, any protection device breaks down, then remaining protection device differentiates knot according to respective
Whether fruit Independent Decisiveness trips.
Compared with prior art, the present invention has advantages below and beneficial effect：
First, the current signal of the electronic current mutual inductor output of multiple stage transformator is communicated with multiple protection devices
Switch in net connects, and all protection devices are jointly protected multiple stage transformator, realized the duplicate protection of every transformator, and institute
The quantity of protection device is less than the quantity of the protection device in traditional multiple stage tranformer protection, reduces cost, and letter
Change secondary connection, solved secondary connection complexity, secondary circuit has brought the problem of malfunction；
2nd, the multiple protection devices protecting same transformator adopt different excitation surge current recognition principles, reach principle
Effect that is complementary, preventing false protection；
3rd, design dynamic protection pattern：When dual transformer runs, each transformator has duplicate protection, no matter just protects
Often work or faulty, protected effect is like the prior art；When single phase transformer runs, this transformator has triple protection, adopts
With two from three voting and different excitation surge current recognition principles, effectively prevent false protection, make protection more reliable.
Brief description
Fig. 1 is existing dual transformer each dual protection philosophy schematic diagram；
Fig. 2 is dual transformer protection scheme principle schematic of the present invention.
Specific embodiment
In conjunction with accompanying drawing, the present invention will be further described in detail, more understands in order to the present invention and should be readily appreciated that.
The present invention is elaborated, Fig. 2 is dual transformer protection scheme principle of the present invention taking dual transformer as a example
Schematic diagram, as shown in Fig. 2 including two transformators, transformator #1 and transformator #2, is that two transformators arrange three protection dresses
Put, referred to as protection 1, protection 2 and protection 3, three protection devices all adopt differential protection as main protection, in two transformators
High-pressure side and low-pressure side configure four current transformers altogether, and are electronic current mutual inductor, and electronic current mutual inductor gathers
Current data be sent to a shared switch through combining unit, shared switch is sent simultaneously to broadcast mode
Protection 1, protection 2 and protection 3.The current data of each electronic current mutual inductor collection can be sent to and be connected with switch
Any one protection device, each protection device is capable of all current data of desampler transmission.
When transformator #1 and transformator #2 runs simultaneously, the corresponding protection transformator #1 of protection 1, the corresponding protection of protection 2 becomes
Depressor #2, transformator #1 and transformator #2 is then protected in protection 3 simultaneously, and three protection devices protect two transformators jointly, and often
Platform transformator has duplicate protection, no matter protects normal work or breaks down, effect all like the prior art, but with
Traditional dual transformer needs to configure four protection devices to be compared, and the present invention has only just reached dual guarantor using three protection devices
The effect of shield, reduces cost, and simplifies secondary connection.
In view of transformer station in actual motion, with the change of payload, and the need of transformer fault and maintenance
Will, only one transformator often occurs in situation about running.Therefore, three protection devices can be with substation level equipment communication
To obtain the actual situation that puts into operation of two transformators, it is divided into dual transformer to run, only transformator #1 runs and only transformator # simultaneously
2 three kinds of situations that put into operation of operation, and the defencive function of three protection devices is dynamically adjusted with this.When only one transformer station high-voltage side bus
When, three protection devices protect run transformator simultaneously, make this transformator have triple protection.
Either dual transformer runs or only one transformer station high-voltage side bus simultaneously, protection same transformator multiple not
Different principles are adopted to identify excitation surge current with protection device, complementary to reach protection philosophy, prevent the effect of false protection.Its
In, the principle of identification excitation surge current includes secondary harmonic brake principle, interval angle braking principle and waveform symmetry braking principle etc..
Certainly, different protection devices can also identify excitation surge current using identical principle.
When dual transformer runs simultaneously：
The corresponding protection transformator #1 of protection 1, identifies excitation surge current using secondary harmonic brake principle；
The corresponding protection transformator #2 of protection 2, identifies excitation surge current using secondary harmonic brake principle；
Transformator #1 and transformator #2 is protected in protection 3 simultaneously, identifies excitation surge current using interval angle braking principle；
Wherein, protection 1 and protection 3, and protection 2 and protection 3, employ different principle identification excitation surge currents, in case
Only false protection.And because different transformators are protected in protection 1 and protection 2 respectively, so, protection 1 and protection 2 employ identical
Principle identification excitation surge current.
Under above-mentioned protected mode, protect protection 1 and the protection 3 of same transformator, and protect 2 and protect 3, respectively
So that each whether for, the differentiation result of trip protection comes whether Independent Decisiveness trips.
When only transformator #1 runs：
Protection 1 protection transformator #1, identifies excitation surge current using secondary harmonic brake principle, and receives protection 2 and protection 3
Whether for, the differentiation result of trip protection, carries out two from three voting, thus deciding whether to trip；
Protection 2 protection transformator #1, identifies excitation surge current using waveform symmetry braking principle, and receives protection 1 and protection 3
Whether for, the differentiation result of trip protection, carries out two from three voting, thus deciding whether to trip；
Protection 3 protection transformator #1, identifies excitation surge current using interval angle braking principle, and it is right with protection 2 to receive protection 1
Whether in, the differentiation result of trip protection, carries out two from three voting, thus deciding whether to trip；
When only transformator #2 runs：
Protection 1 protection transformator #2, identifies excitation surge current using secondary harmonic brake principle, and receives protection 2 and protection 3
Whether for, the differentiation result of trip protection, carries out two from three voting, thus deciding whether to trip；
Protection 2 protection transformator #2, identifies excitation surge current using waveform symmetry braking principle, and receives protection 1 and protection 3
Whether for, the differentiation result of trip protection, carries out two from three voting, thus deciding whether to trip；
Protection 3 protection transformator #2, identifies excitation surge current using interval angle braking principle, and it is right with protection 2 to receive protection 1
Whether in, the differentiation result of trip protection, carries out two from three voting, thus deciding whether to trip；
Protected mode in the case of running two kinds with only transformator #2, protection 1, protection 2 and are run for only transformator #1
Protection 3 adopts different principle to identify excitation surge current, to prevent false protection；There is any protection when protecting in 1, protection 2 and protection 3
When device breaks down, no longer put to the vote, remaining protection device is according to each independently determining for the differentiation result whether tripping
Determine whether to trip；Before carrying out two from three voting, find that protection device cannot obtain sentencing of other any one protection devices
Other result, that is, think and have protection device to break down.
In terms of CPU burden and practicality, when dual transformer runs simultaneously, because protection 3 will protect two transformators, institute
Twice for GPF (General Protection False device is born with the CPU protecting 3, in the case of the CPU that do not upgrade, the operating time of protection of protection 3
Ratio operating time of protection several ms to more than ten ms slowly of GPF (General Protection False device, and this is acceptable.Additionally, protection 1 or guarantor
, prior to protecting 3 actions, therefore, for every transformator, the rapidity of protection is constant for shield 2.Even if selecting upgrading protection 3
CPU, the expense of upgrading CPU is more much lower than the cost of one protection device of multi-configuration, so, the present invention can reduce and protects into
This.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for those skilled in the art
For member, the present invention can have various modifications and variations.All any modifications within the spirit and principles in the present invention, made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (7)
1. a kind of multiple transformers protection scheme it is characterised in that include multiple stage transformator, the high-pressure side of every described transformator and
Low-pressure side is respectively configured with electronic current mutual inductor, and described electronic current mutual inductor gathers the height of described transformator respectively
Pressure side and the current data of low-pressure side, described current data is sent to a shared switch through combining unit, shares
Switch be sent simultaneously to each protection device of being connected with described switch, the quantity of described protection device with broadcast mode
Quantity more than described transformator, the quantity of the described transformator less than twice；
When in transformator described in multiple stage, at least two transformators run simultaneously, partly described protection device all corresponds to protection one
Transformator described in platform, remaining the described protection device having more number transformer shares the protection of all transformators jointly, realizes institute
The dual having transformator is protected；When only having transformer station high-voltage side bus in transformator described in multiple stage, all described protection devices
Protect run transformator simultaneously, realize the multiple protective of institute's operating transformer.
2. multiple transformers protection scheme according to claim 1 is it is characterised in that work as the protection of same transformator of protection
When the number of device is even number, then whether described protection device trips according to respective differentiation result Independent Decisiveness；When protection is same
When the number of the protection device of one transformator is odd number, each described protection device all receives sentencing of remaining described protection device
Other result, and put to the vote so that the minority is subordinate to the majority, decide whether to trip.
3. multiple transformers protection scheme according to claim 1 is it is characterised in that include two transformators, transformator #1
With transformator #2, and three protection devices, protection 1, protection 2 and protection 3, two high voltage side of transformers are set for two transformators
It is configured with four electronic current mutual inductors with low-pressure side altogether, described electronic current mutual inductor gathers described high voltage side of transformer
With the current data of low-pressure side, described current data is sent to a shared switch through combining unit, shared friendship
Change planes and described protection 1, described protection 2 and described protection 3 are sent simultaneously to broadcast mode；
When described transformator #1 and described transformator #2 runs simultaneously, the described protection 1 described transformator #1 of corresponding protection, described
Protection 2 is corresponding to protect described transformator #2, and described transformator #1 and described transformator #2 is protected in described protection 3；When described transformation
When device #1 or described transformator #2 isolated operation, described protection 1, described protection 2 and described protection 3 protection simultaneously are run
Transformator.
4. the multiple transformers protection scheme according to claim 1 or 3 is it is characterised in that protect the guarantor of same transformator
Protection unit adopts different principles to identify excitation surge current.
5. multiple transformers protection scheme according to claim 3 is it is characterised in that described transformator #1 and described transformation
When device #2 runs simultaneously, whether the protection device of same transformator of protection trips according to respective differentiation result Independent Decisiveness.
6. multiple transformers protection scheme according to claim 3 is it is characterised in that described transformator #1 or described transformation
During device #2 isolated operation, each protection device all receives the differentiation result of other two protection device, and carries out two from three voting,
Decide whether to trip.
7. the multiple transformers protection scheme according to claim 2 or 6 is it is characterised in that before voting, any protection device
Break down, then whether remaining described protection device trips according to respective differentiation result Independent Decisiveness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611179920.XA CN106451353B (en) | 2016-12-19 | 2016-12-19 | A kind of multiple transformers guard method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611179920.XA CN106451353B (en) | 2016-12-19 | 2016-12-19 | A kind of multiple transformers guard method |
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| CN106451353A true CN106451353A (en) | 2017-02-22 |
| CN106451353B CN106451353B (en) | 2018-11-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086552A (en) * | 2017-06-21 | 2017-08-22 | 四川电力设计咨询有限责任公司 | The protection circuit of enlarging unit connection type system |
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| CN103036216A (en) * | 2012-12-07 | 2013-04-10 | 延安供电局 | System and clock synchronization method applied to intelligentized converting station digitization busbar differential protection |
| CN104485736A (en) * | 2014-11-13 | 2015-04-01 | 西安交通大学 | Intelligent protection center-based wide-area backup protection system and method |
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|---|---|---|---|---|
| JP2001333549A (en) * | 2000-03-15 | 2001-11-30 | Mitsubishi Electric Corp | Power system protective control system and system constructing method therfor |
| CN102474095A (en) * | 2009-07-07 | 2012-05-23 | Abb研究有限公司 | Substation automation system with remote redundant protection function |
| CN101789624A (en) * | 2009-12-09 | 2010-07-28 | 中国电力科学研究院 | Centralized digital transformer substation system |
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| CN103036216A (en) * | 2012-12-07 | 2013-04-10 | 延安供电局 | System and clock synchronization method applied to intelligentized converting station digitization busbar differential protection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086552A (en) * | 2017-06-21 | 2017-08-22 | 四川电力设计咨询有限责任公司 | The protection circuit of enlarging unit connection type system |
| CN107086552B (en) * | 2017-06-21 | 2020-02-07 | 四川电力设计咨询有限责任公司 | Protection circuit of extended cell wiring system |
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| CN106451353B (en) | 2018-11-23 |
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