CN106505520A - One kind is taken out can reactor inter-turn protection method and device - Google Patents
One kind is taken out can reactor inter-turn protection method and device Download PDFInfo
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- CN106505520A CN106505520A CN201611086377.9A CN201611086377A CN106505520A CN 106505520 A CN106505520 A CN 106505520A CN 201611086377 A CN201611086377 A CN 201611086377A CN 106505520 A CN106505520 A CN 106505520A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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Abstract
The present invention discloses one kind and takes out energy reactor inter-turn protection method and device.The method includes：Using take out can reactor take out can winding side output end negative sequence voltage and take out can reactor take out can winding side output end negative-sequence current calculated, obtain negative sequence impedance measured value Z2.cn；Negative phase-sequence is measured resistance value Z2.cnWith take out can winding side negative phase-sequence adjust resistance value Z2.setIt is compared, judges whether that energy reactor interturn protection is taken out in locking, work as Z2.cnIt is more than Z2.setWhen, then judge position that failure occurs not take out can reactor take out can be outside winding lateral areas；Work as Z2.cnIt is less than Z2.setWhen, then judge position that failure occurs take out can reactor take out can be outside winding lateral areas, locking interturn protection.The present invention for real-time monitoring take out can reactor unbalanced fault, its quickly and accurately can distinguish take out can reactor take out can be in lateral areas and external area error, on the premise of conventional interturn protection sensitivity is not reduced, can the reliable braking of winding side external area error to taking out.
Description
Technical field
The present invention relates to protecting electrical power system field, more particularly to a kind of based on take out can taking out for side negative sequence impedance locking can electricity
Anti- device inter-turn protection method and device.
Background technology
Take out energy reactor and there is larger difference with traditional reactor and transformer, return yoke is usually located at due to taking out energy winding
On, former secondary coupling is weaker, and principal reactance device side rated capacity differs hundreds of times with energy winding side rated capacity is taken out, and the vertical connection of electric current is poor
Move and cannot install.
Traditional based on the interturn protection of negative -sequence power direction, zero sequence power direction interturn protection and with offset voltage zero
Sequence power direction interturn protection use range is conventional parallel reactor, and the difference of energy reactor and conventional reactor is taken out in not consideration
The opposite sex.When generation unbalanced fault outside energy lateral areas is taken out, obtaining voltage x current amount from reactor high-pressure side protection installation place is carried out
Calculate, be possible to be believed to satisfy the condition needed for turn-to-turn fault is judged in area, and cut reactor by mistake.
Have problems in sum, it is necessary to which existing energy reactor interturn protection criterion of taking out is improved.
Content of the invention
The purpose of the present invention, be to provide a kind of based on take out can taking out for side negative sequence impedance locking can reactor interturn protection side
Method and device, for solve the problems, such as to take out can reactor interturn protection take out can break down outside winding lateral areas can malfunction, its side
By taking out, energy winding side three-phase voltage taken out by energy reactor to method and three-phase current calculates gained negative sequence impedance, with the impedance criterion for arranging
It is compared, on the premise of not reducing original interturn protection sensitivity, improves the reliability of protection act.
For achieving the above object, in a first aspect, the invention provides one kind takes out energy reactor inter-turn protection method, the party
Method includes：
The three-phase voltage and three-phase current of energy reactor principal reactance device high-pressure side output end is taken out in measurement, judges asymmetric event
Barrier occur system side still take out can reactor side, described take out can reactor side include reactor first winding, take out can winding and
Take out box type transformer and the station load-side of energy winding connection；
The three-phase voltage and three-phase current that energy winding side output end taken out by energy reactor is taken out in measurement；
Three-phase voltage and three-phase current according to energy winding side output end is taken out is calculated takes out energy winding side negative sequence impedance measured value
Z2.cn；
Negative phase-sequence is measured resistance value Z2.cnWith take out can winding side negative phase-sequence adjust resistance value Z2.setIt is compared, judges whether to close
Energy reactor interturn protection taken out by lock, wherein：Work as Z2.cnIt is more than Z2.setWhen, then judge that energy reactor is not being taken out in the position that failure occurs
Take out outside energy winding lateral areas, not locking interturn protection；Work as Z2.cnIt is less than Z2.setWhen, then judge that energy reactance is being taken out in the position that failure occurs
Device is taken out outside energy winding lateral areas, locking interturn protection,
Preferably, described taking out can winding side negative phase-sequence measurement resistance value Z2.cnIt is calculated by equation below：
The implication of wherein each symbol is as follows：
The voltage measuring value of three facies tract vectors of energy winding side is respectively taken out；
The current measurement value of three facies tract vectors of energy winding side is respectively taken out；
A is the corner factor, and a represents 120 ° of corners counterclockwise, a2Represent 240 ° of corners counterclockwise；
For calculating the negative sequence voltage of gained；
For calculating the negative-sequence current of gained；
Z2.cnFor calculating the negative sequence impedance of gained..
Preferably, described take out can winding side negative phase-sequence adjust resistance value Z2.setEnergy winding side secondary load negative phase-sequence is taken out for actual
A tuning coefficient k is multiplied by impedance, and the span of k is 0.3～0.5, its protection domain be with impedance coordinates axle origin as the center of circle,
With Z2.setModulus value for radius whole impedance justify.
Preferably, the negative-sequence current for calculating gainedLess than threshold value I for setting2.setWhen, do not carry out to taking out energy reactance
The locking of device interturn protection is processed, the I2.setValue is that 0.06 times～0.2 times take out can winding side participation negative sequence impedance judgement
Current Transformer Secondary rated current.
Preferably, described judge unbalanced fault occur system side still take out can reactor side be in the following manner
In one kind and realize：
Based on the interturn protection of negative -sequence power direction, based on zero sequence power direction interturn protection and the zero sequence with offset voltage
Power direction interturn protection.
In second aspect, the invention provides a kind of based on take out can taking out for side negative sequence impedance locking can reactor interturn protection
Device.The device includes sampling module, computing module, judge module,
The sampling module is connected with the computing module, and taking out for collection can reactor principal reactance device high-pressure side output end
And take out the three-phase voltage and three-phase current of energy winding side output end；
The computing module is connected with the judge module, for according to take out can reactor take out can winding side output end three
Phase voltage and three-phase current are calculated, calculate take out can reactor take out can winding side negative phase-sequence measurement impedance Z2.cn；
The judge module, for according to the three-phase voltage and three-phase electricity for taking out energy reactor principal reactance device high-pressure side output end
Stream judges that unbalanced fault occurs still to take out energy reactor side in system side, and negative phase-sequence is measured resistance value Z2.cnWith take out energy
Winding side negative phase-sequence is adjusted resistance value Z2.setIt is compared, decides whether that energy reactor interturn protection is taken out in locking, wherein：When
Z2.cnIt is more than Z2.setWhen, then judge position that failure occurs not take out can reactor take out can be outside winding lateral areas, not locking turn-to-turn is protected
Shield；Work as Z2.cnIt is less than Z2.setWhen, then judge position that failure occurs take out can reactor take out can be outside winding lateral areas, locking turn-to-turn is protected
Shield.
Preferably, the sampling module can support analog input and optical fiber and digital amount signal according to engineering requirements,
For conventional project, the sampling module includes Analog input mModule and analog-to-digital conversion module；For Digitization Project, described
Sampling module includes optical signal prosessing module.
Preferably, the computing module is calculated by equation below and takes out energy winding side negative phase-sequence measurement resistance value Z2.cn：
The implication of wherein each symbol is as follows：
The voltage measuring value of three facies tract vectors of energy winding side is respectively taken out；
The current measurement value of three facies tract vectors of energy winding side is respectively taken out；
A is the corner factor, and a represents 120 ° of corners counterclockwise, a2Represent 240 ° of corners counterclockwise；
For calculating the negative sequence voltage of gained；
For calculating the negative-sequence current of gained；
Z2.cnFor calculating the negative sequence impedance of gained.
Preferably, described take out can winding side negative phase-sequence adjust resistance value Z2.setEnergy winding side secondary load negative phase-sequence is taken out for actual
A tuning coefficient k is multiplied by impedance, and the span of k is 0.3～0.5, its protection domain be with impedance coordinates axle origin as the center of circle,
With Z2.setModulus value for radius whole impedance justify.
Preferably, the negative-sequence current for calculating gainedLess than threshold value I for setting2.setWhen, do not carry out to taking out energy reactance
The locking of device interturn protection is processed, the I2.setValue is that 0.06 times～0.2 times take out can winding side participation negative sequence impedance judgement
Current Transformer Secondary rated current.
By using taking out, energy winding side three-phase voltage taken out by energy reactor to the present invention and three-phase current calculates gained negative sequence impedance,
It is compared to judge whether to locking interturn protection with the impedance criterion for arranging, it is to avoid the discriminating direction of little electric parameters is stranded
Difficulty, according to breaking down in different positions, the greatest differences of its negative phase-sequence measurement impedance are judging outside Nei He areas of area.Do not dropping
On the premise of low original interturn protection sensitivity, the reliability of protection act is improve.
Description of the drawings
Fig. 1 is the connection diagram for taking out energy reactor and protection device of the embodiment of the present invention；
Fig. 2 is the protection decision logic schematic diagram of the embodiment of the present invention；
Fig. 3 is the structured flowchart of the protection device of the embodiment of the present invention.
Description of reference numerals：
A- protection devices are taken out energy reactor high-pressure side turn-to-turn and differentiate that logic, b- protection devices are taken out energy reactor and take out energy winding side
Negative sequence impedance differentiates that logic, CT-Ha- take out energy reactor high-pressure side a phase current mutual inductors, and CT-Hb- takes out can reactor high-pressure side b
Phase current mutual inductor, CT-Hc- take out energy reactor high-pressure side c phase current mutual inductors, and CT-La- takes out energy winding side for taking out energy reactor
A phase current mutual inductors, CT-Lb- take out energy winding side b phase current mutual inductors for taking out energy reactor, and CT-Lc- is taken out for taking out energy reactor
Energy winding side c phase current mutual inductors, PT-H- take out energy reactor high side voltage transformer, and PT-L takes out energy side for taking out energy reactor
Voltage transformer.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be noted that accompanying drawing is merely illustrative, do not paint according to strict ratio
System, and the wherein possible promising partial enlargement for describing facility and carrying out, diminution, for conventional partial structure may also have necessarily
Default.
Fig. 1 is the connection diagram for taking out energy reactor and protection device of the embodiment of the present invention.
As shown in figure 1, the present invention take out can reactor high-pressure side be provided with that take out can reactor high-pressure side a phase current mutual inductors
CT-Ha, take out can reactor high-pressure side b phase current mutual inductor CT-Hb, take out can reactor high-pressure side c phase current mutual inductors CT-Hc and
Taking out can reactor high side voltage transformer PT-H.Take out can reactor take out can winding side be provided with take out can reactor take out can winding side a
Phase current mutual inductor CT-La, take out can reactor take out can winding side b phase current mutual inductor CT-Lb, take out can reactor take out can winding side
C phase current mutual inductors CT-Lc takes out energy side voltage transformer pt-L with energy reactor is taken out.Protection device passes through CT-Ha, CT- respectively
Hb, CT-Hc are connected with the high-pressure side for taking out energy reactor with PT-H, are passed through CT-La, CT-Lb, CT-Lc and PT-L respectively and are taken out energy
The energy winding side of taking out of reactor is connected.Wherein, it is system side above CT-Ha, CT-Hb, CT-Hc, CT-Ha, CT-Hb, CT-Hc are extremely
For taking out energy reactor side between CT-La, CT-Lb, CT-Lc, below CT-La, CT-Lb, CT-Lc, energy winding is taken out for taking out energy reactor
Outside lateral areas.
The present invention carries out the interturn protection for taking out energy reactor using said structure, comprises the steps：
Collection is taken out energy reactor high-pressure side three-phase PT secondary voltages and takes out energy reactor high-pressure side three-phase CT secondary currents, adopts
With with conventional shunt reactor turn-to-turn protection identical method, judging that unbalanced fault occurs still to take out in system side can reactance
Device side (take out can reactor turn-to-turn criterion a), turn-to-turn criterion a can adopt conventional negative -sequence power direction, zero sequence power direction or
Zero sequence power direction element of the person with offset voltage.Wherein, take out can reactor side comprising reactor first winding, take out can winding,
Can the box type transformer that is connected of winding and station load-side with taking out.
The three-phase PT secondary voltages and three-phase CT secondary currents that energy winding side output end taken out by energy reactor is taken out in collection；According to taking out
The three-phase PT secondary voltages and three-phase CT secondary currents of energy winding side output end is calculated takes out energy winding side negative sequence impedance measured value
Z2.cn；Negative phase-sequence is measured resistance value Z2.cnWith take out can winding side negative phase-sequence adjust resistance value Z2.setIt is compared, judges whether locking
Take out energy reactor interturn protection, (turn-to-turn criterion b).Work as Z2.cnIt is more than Z2.setWhen, it is believed that do not taking out energy electricity in the position that failure occurs
Anti- device is taken out outside energy winding lateral areas, not locking interturn protection；Work as Z2.cnIt is less than Z2.setWhen, it is believed that taking out energy electricity in the position that failure occurs
Anti- device is taken out outside energy winding lateral areas, locking interturn protection.Wherein, take out can winding side negative phase-sequence adjust resistance value Z2.setTake out for actual
Can winding side secondary load negative sequence impedance be multiplied by a tuning coefficient k, the span of k is 0.3～0.5, its protection domain be with
Impedance coordinates axle origin be the center of circle, with Z2.setModulus value for radius whole impedance circle 5.Taking out can winding side negative phase-sequence measurement resistance value
Z2.cnObtained by below equation：
The implication of wherein each symbol is as follows：
The voltage measuring value of three facies tract vectors of energy winding side is respectively taken out；
The current measurement value of three facies tract vectors of energy winding side is respectively taken out；
A is the corner factor, and a represents 120 ° of corners counterclockwise, a2Represent 240 ° of corners counterclockwise；
For calculating the negative sequence voltage of gained；
For calculating the negative-sequence current of gained；
Z2.cnFor calculating the negative sequence impedance of gained.
Wherein, in order to prevent under normal operation without negative sequence voltage and negative-sequence current, the molecule in formula (3)And denominatorAll close to 0, cause to calculate exception.Fall in the negative sequence impedance circle of setting when negative phase-sequence measures impedance, while take out can winding side
Negative-sequence currentMore than open threshold value I for setting2.set, the interturn protection of locking high-pressure side.Wherein I2.setValue is 0.06～0.2
Energy winding side of taking out again participates in the Current Transformer Secondary rated current that negative sequence impedance judges.
Energy reactor design parameter is taken out below according to certain 500kV transformer station domestic, is discussed in detail to be based in conjunction with accompanying drawing and is taken out energy
Taking out for side negative sequence impedance locking can reactor inter-turn protection method.Take out energy reactor parameter as follows：
Reactor rated capacity：6000kvar/167kVA；
Reactor rated voltage：318kV/6kV；
Rated current：189A/27.8A；
On high-tension side measurement impedance is converted to during normal operation：1680Ω；
Take out on high-tension side measurement impedance can be converted to during winding metallic short circuit：1547.19Ω；
The measurement impedance for taking out energy winding side is converted to during normal operation：215.7Ω；
The measurement impedance for taking out energy winding side is converted to during the metallic short circuit of reactor high-pressure side：5.98Ω.
For static equipment, in power system, can generally will be considered that positive sequence impedance is approximately equal to as a example by reactor by above-mentioned taking out
Negative sequence impedance, due to 500kV transformer stations with interconnection closely, interconnection impedance is less, for reactor impedance,
Almost it is negligible, under correct ruuning situation, takes out the negative phase-sequence measurement impedance that experiences energy winding side and be approximately equal to positive sequence survey
Amount 215.7 Ω of impedance, 215.7 ohm here are a load measurement impedance Z '2.cnloadRepresent, can be according to below equation
It is scaled to secondary load measurement impedance：
N in formula (4)ctFor taking out energy winding side CT no-load voltage ratios, NptFor taking out energy winding side PT no-load voltage ratios, conduct after safety factor k is taken
Secondary negative sequence impedance setting valve, wherein k, can be with values as 0.3～0.5 according to actual conditions.
Z2.set=k Z2.cnloadFormula (5)
Energy winding protection installation place is being taken out near system side generation unbalanced fault in such scheme, as negative phase-sequence power supply exists
Trouble point, it is load negative sequence impedance to take out energy winding side and protect the negative sequence impedance that installation place measures, and is worth than larger, is close to
Z2.cnload, will not fall into Z2.setImpedance circle in；And there is asymmetric event energy winding protection installation place is taken out near load side
Barrier, negative phase-sequence power supply are taken out energy winding side and protect the negative sequence impedance that installation place measures to be reactor negative sequence impedance and be in load-side
System contact negative sequence impedance, value are smaller, can drop into Z2.setImpedance circle in, so as to the interturn protection of locking high-pressure side.
After using the method for the present invention, can effectively distinguish that take out can be asymmetric in asymmetric, area outside reactor Chou Neng windings areas
Failure, does not reduce the reliability that improve interturn protection while taking out energy reactor interturn protection sensitivity, while whole impedance circle
Criterion, it is to avoid the discriminating direction of little electric parameters is difficult, according to breaking down in different positions, its negative phase-sequence measurement impedance
Greatest differences are judging outside Nei He areas of area.
Fig. 2 is the protection decision logic schematic diagram of the embodiment of the present invention.
As shown in Fig. 2 the high-pressure side turn-to-turn criterion in Fig. 2 is to differentiate logic a in Fig. 1, taking out can side Z2.cn<Z2.setWith take out energy
SideDifferentiation logic b in for Fig. 1, taking out can side Z2.cn<Z2.setCan side with taking outComposition first and door relation, main
Reactor side PT breaks and takes out energy winding side PT broken string the first OR gate relations of composition, and the soft pressing plate of interturn protection and interturn protection are hard
Pressing plate composition second and door relation.Taking out can side Z2.cn<Z2.setCan side with taking outThe first of composition and gate output terminal and main electricity
The output end of anti-device side PT broken strings and the first OR gate for taking out energy winding side PT broken string compositions constitutes the second OR gate relation, the second OR gate
Output end through the first not gate and high-pressure side turn-to-turn criterion composition the 3rd and door relation, the 3rd with the output end of door with second with
Output end composition the 4th and the door relation of door, the 4th is interturn protection action with the output end of door.
In principal reactance device high-pressure side output end and take out can winding side occur once or when secondary PT breaks, due to nothing
Method travel direction element measurement again, interturn protection and negative sequence impedance criterion are exited, while interturn protection is pressed firmly by interturn protection
Plate and the soft pressing plate control of interturn protection, the hard pressing plate of interturn protection and the soft pressing plate of interturn protection are and door relation, when put into simultaneously
When, protection can just put into.
Fig. 3 is the structured flowchart of the protection device of the embodiment of the present invention.
As shown in figure 3, the protection device of the embodiment of the present invention includes sampling module, computing module and judge module.
Sampling module is connected with the computing module, and energy reactor principal reactance device high-pressure side output end is taken out in mainly responsible collection
And take out the three-phase voltage and three-phase current of energy winding side output end.Wherein, sampling module can support mould according to engineering requirements
Analog quantity is input into (for the analog quantity that live conventional voltage transformer, current transformer are passed over) and optical fiber and digital amount signal (electricity
Minor transformer is through merging the digital quantity signal after cell processing).For conventional project, sampling module includes analog input mould
Block and analog-to-digital conversion module.For Digitization Project, sampling module includes optical signal prosessing module.
Computing module is connected with the judge module, and main responsible basis takes out three that energy winding side output end taken out by energy reactor
Phase voltage and three-phase current are calculated, calculate take out can reactor take out can winding side negative phase-sequence measurement impedance Z2.cn.Taking out can winding
Side negative phase-sequence measurement resistance value Z2.cnObtained by below equation：
The implication of wherein each symbol is as follows：
The voltage measuring value of three facies tract vectors of energy winding side is respectively taken out；
The current measurement value of three facies tract vectors of energy winding side is respectively taken out；
A is the corner factor, and a represents 120 ° of corners counterclockwise, a2Represent 240 ° of corners counterclockwise；
For calculating the negative sequence voltage of gained；
For calculating the negative-sequence current of gained；
Z2.cnFor calculating the negative sequence impedance of gained.
Judge module is mainly responsible for according to the three-phase voltage and three-phase electricity for taking out energy reactor principal reactance device high-pressure side output end
Stream judges that unbalanced fault occurs still to take out energy reactor side in system side, and negative phase-sequence is measured resistance value Z2.cnWith take out energy
Winding side negative phase-sequence measurement resistance value Z2.setIt is compared, decides whether that energy reactor interturn protection is taken out in locking, wherein：When
Z2.cnIt is more than Z2.setWhen, then judge position that failure occurs not take out can reactor take out can be outside winding lateral areas, not locking turn-to-turn is protected
Shield；Work as Z2.cnIt is less than Z2.setWhen, then judge position that failure occurs take out can reactor take out can be outside winding lateral areas, locking turn-to-turn is protected
Shield.Take out can winding side negative phase-sequence adjust resistance value Z2.setFor actual take out can winding side secondary load negative sequence impedance be multiplied by one and adjust and be
The span of number k, k is 0.3～0.5, and its protection domain is as the center of circle, with Z with impedance coordinates axle origin2.setModulus value be half
The whole impedance circle in footpath.
In addition, in order to prevent under normal operation without negative sequence voltage and negative-sequence current, the molecule in formula (3)And denominatorAll close to 0, cause to calculate exception.Fall in the negative sequence impedance circle of setting when negative phase-sequence measures impedance, while take out can winding side
Negative-sequence currentMore than open threshold value I for setting2.set, the interturn protection of locking high-pressure side.Wherein I2.setValue is 0.06～0.2
Energy winding side of taking out again participates in the Current Transformer Secondary rated current that negative sequence impedance judges.
It should be appreciated that according to the present invention take out can reactor interturn protection can also have following change：
1) when take out can reactor normally run when, negative sequence voltage and negative-sequence current are theoretically equal to zero, meeting in actual motion
Existing, but amount being very little, negative-sequence current sentences threshold value less than rising for setting, and locking is not carried out to interturn protection.
2) when energy reactor high pressure lateral areas outgoing life unbalanced fault is taken out, take out energy winding side impedance criterion and meet, open
Interturn protection, and the interturn protection of high-pressure side itself is the protection with direction, will not export, interturn protection will not misoperation.
3) when there is unbalanced fault in Chou Neng reactors area, taking out energy winding side impedance criterion and meeting, open turn-to-turn is protected
Shield, while the interturn protection positive direction of high-pressure side itself meets, interturn protection action cuts off failure.
4) when take out can reactor take out unbalanced fault can occur outside winding lateral areas when, take out can winding side impedance criterion be discontented with
Foot, locking interturn protection, although the interturn protection positive direction of high-pressure side itself meets, interturn protection will not misoperation.
In addition, in describing the invention, it should be noted that term " being connected " " connection " should be interpreted broadly, for example,
Can be fixedly connected, or be detachably connected, or be integrally connected；Can be mechanically connected, or electrically connect；
Can be joined directly together, it is also possible to be indirectly connected to by intermediary.For the ordinary skill in the art, can have
Body situation understands above-mentioned term concrete meaning in the present invention.In describing the invention, it should be noted that unless otherwise
Clearly regulation and restriction.Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying
Relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, " first " is defined, the feature of " second " can
To express or implicitly include at least one this feature.
Above-described specific embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, the be should be understood that specific embodiment that the foregoing is only the present invention is not intended to limit the present invention
Protection domain, all any modification, equivalent substitution and improvements that within the spirit and principles in the present invention, is done etc. all should include
Within protection scope of the present invention.
Claims (10)
1. one kind takes out energy reactor inter-turn protection method, it is characterised in that include：
The three-phase voltage and three-phase current of energy reactor principal reactance device high-pressure side output end is taken out in measurement, judges that unbalanced fault is sent out
Life still takes out energy reactor side in system side, and the energy reactor side of taking out includes reactor first winding, takes out energy winding and take out energy
The box type transformer of winding connection and station load-side；
The three-phase voltage and three-phase current that energy winding side output end taken out by energy reactor is taken out in measurement；
Three-phase voltage and three-phase current according to energy winding side output end is taken out is calculated takes out energy winding side negative sequence impedance measured value Z2.cn；
Negative phase-sequence is measured resistance value Z2.cnWith take out can winding side negative phase-sequence adjust resistance value Z2.setIt is compared, judges whether that locking is taken out
Energy reactor interturn protection, wherein：Work as Z2.cnIt is more than Z2.setWhen, then judge failure occur position not take out can reactor take out energy
Outside winding lateral areas, not locking interturn protection；Work as Z2.cnIt is less than Z2.setWhen, then judge failure occur position take out can reactor take out
Outside energy winding lateral areas, locking interturn protection.
2. one kind according to claim 1 takes out energy reactor inter-turn protection method, it is characterised in that described taking out can winding side
Negative phase-sequence measures resistance value Z2.cnIt is calculated by equation below：
The implication of wherein each symbol is as follows：
The voltage measuring value of three facies tract vectors of energy winding side is respectively taken out；
The current measurement value of three facies tract vectors of energy winding side is respectively taken out；
A is the corner factor, and a represents 120 ° of corners counterclockwise, a2Represent 240 ° of corners counterclockwise；
For calculating the negative sequence voltage of gained；
For calculating the negative-sequence current of gained；
Z2.cnFor calculating the negative sequence impedance of gained.
3. one kind according to claim 1 takes out energy reactor inter-turn protection method, it is characterised in that described taking out can winding side
Negative phase-sequence is adjusted resistance value Z2.setA tuning coefficient k, the value model of k are multiplied by for actual energy winding side secondary load negative sequence impedance of taking out
Enclose for 0.3～0.5, its protection domain is as the center of circle, with Z with impedance coordinates axle origin2.setModulus value for radius whole impedance justify.
4. one kind according to claim 2 takes out energy reactor inter-turn protection method, it is characterised in that the calculating gained
Negative-sequence currentLess than threshold value I for setting2.setWhen, do not carry out processing the locking for taking out energy reactor interturn protection, the I2.set
Value is that 0.06～0.2 times of energy winding side of taking out participates in the Current Transformer Secondary rated current that negative sequence impedance judges.
5. take out can reactor inter-turn protection method for one kind according to claim 1, it is characterised in that described judge not right
Claiming failure to occur still to take out energy reactor side in system side is realized by the one kind in following protected mode：
Based on the interturn protection of negative -sequence power direction, based on zero sequence power direction interturn protection and the homopolar power with offset voltage
Direction interturn protection.
6. a kind of based on take out can taking out for side negative sequence impedance locking can reactor interturn protection device, it is characterised in that including sampling
Module, computing module, judge module,
The sampling module is connected with the computing module, is taken out energy reactor principal reactance device high-pressure side output end for collection and is taken out
The three-phase voltage and three-phase current of energy winding side output end；
The computing module is connected with the judge module, takes out the three-phase electricity that energy winding side output end taken out by energy reactor for basis
Pressure and three-phase current are calculated, calculate take out can reactor take out can winding side negative phase-sequence measurement impedance Z2.cn；
The judge module, for sentencing according to the three-phase voltage and three-phase current of taking out energy reactor principal reactance device high-pressure side output end
Break unbalanced fault occur system side still take out can reactor side, and negative phase-sequence is measured resistance value Z2.cnCan winding with taking out
Side negative phase-sequence measurement resistance value Z2.setIt is compared, judges whether that energy reactor interturn protection is taken out in locking, wherein：Work as Z2.cnIt is more than
Z2.setWhen, then judge position that failure occurs not take out can reactor take out can be outside winding lateral areas, not locking interturn protection；Work as Z2.cn
It is less than Z2.setWhen, then judge position that failure occurs take out can reactor take out can be outside winding lateral areas, locking interturn protection.
7. according to claim 6 a kind of based on take out can side negative sequence impedance locking take out can reactor interturn protection device,
Characterized in that, the sampling module can support analog input and optical fiber and digital amount signal according to engineering requirements, for
Conventional project, the sampling module include Analog input mModule and analog-to-digital conversion module；For Digitization Project, the sampling
Module includes optical signal prosessing module.
8. according to claim 6 a kind of based on take out can side negative sequence impedance locking take out can reactor interturn protection device,
Characterized in that, the computing module is calculated by equation below takes out energy winding side negative phase-sequence measurement resistance value Z2.cn：
The implication of wherein each symbol is as follows：
The voltage measuring value of three facies tract vectors of energy winding side is respectively taken out；
The current measurement value of three facies tract vectors of energy winding side is respectively taken out；
A is the corner factor, and a represents 120 ° of corners counterclockwise, a2Represent 240 ° of corners counterclockwise；
For calculating the negative sequence voltage of gained；
For calculating the negative-sequence current of gained；
Z2.cnFor calculating the negative sequence impedance of gained.
9. one kind according to claim 8 takes out energy reactor inter-turn protection method, it is characterised in that the calculating gained
Negative-sequence currentLess than threshold value I for setting2.setWhen, do not carry out processing the locking for taking out energy reactor interturn protection, the I2.set
Value is that 0.06 times～0.2 times of energy winding side of taking out participates in the Current Transformer Secondary rated current that negative sequence impedance judges.
10. one kind according to claim 6 takes out energy reactor inter-turn protection method, it is characterised in that described taking out can winding
Side negative phase-sequence is adjusted resistance value Z2.setA tuning coefficient k, the value of k are multiplied by for actual energy winding side secondary load negative sequence impedance of taking out
Scope is 0.3～0.5, and its protection domain is as the center of circle, with Z with impedance coordinates axle origin2.setModulus value for radius whole impedance
Circle.
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| CN107276031A (en) * | 2017-05-19 | 2017-10-20 | 上海子富安防科技有限公司 | The guard method of 35 kilovolts of dry-type air-core reactors in parallel |
| CN107919651A (en) * | 2017-12-15 | 2018-04-17 | 国家电网公司华中分部 | One kind is taken out can reactor pumping energy winding inter-turn zero-sequenceprotection method and device |
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