CN108134372B - The recognition methods of reactor current transformer disconnection, differential protecting method and device - Google Patents
The recognition methods of reactor current transformer disconnection, differential protecting method and device Download PDFInfo
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- CN108134372B CN108134372B CN201711460738.6A CN201711460738A CN108134372B CN 108134372 B CN108134372 B CN 108134372B CN 201711460738 A CN201711460738 A CN 201711460738A CN 108134372 B CN108134372 B CN 108134372B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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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
- H02H7/042—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 for current transformers
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- Evolutionary Computation (AREA)
- Protection Of Transformers (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to a kind of reactor current transformer disconnection recognition methods, differential protecting method and device, the recognition methods of current transformer circuit supervision fail includes: the entry condition for judging whether to meet current transformer circuit supervision fail differentiation；If meeting entry condition, judge whether to meet following condition: (1) zero-sequence current of reactor local terminal is not zero after broken string differentiation starting and any phase phase current is zero；(2) zero-sequence current of the reactor other end is zero when broken string differentiates starting and three-phase phase current is not zero；(3) residual voltage of reactor head end is zero when broken string differentiates starting；If above-mentioned condition is all satisfied, after the delay time of setting, reactor current transformer disconnection is determined.The present invention identifies whether current transformer breaks according to the feature of current transformer circuit supervision fail and failure; in addition it introduces reactor head end voltage and carries out subsidiary discriminant; it can be accurately judged to whether reactor current mutual inductor breaks, the action message for differential protection provides foundation.
Description
Technical field
The present invention relates to the recognition methods of reactor current transformer disconnection, differential protecting method and devices, belong to power train
System technical field of relay protection.
Background technique
" electrical safe working order " regulation, the secondary loop of mutual inductor of electrification are forbidden to open a way when working.Extra-high voltage
The current transformer that equipment uses, secondary winding the number of turns is more, and open-circuit voltage is very high.Secondary voltage high in this way may not only make two
The insulation of secondary winding and secondary device is damaged, and iron core can be made to burn because of overheat, or even threatens personal safety, so
Current regulation and countermeasure usually recommends not Blocking Differential Protection for extra-high voltage reactor current transformer circuit supervision fail.
The overvoltage that open circuit of secondary loop of current transformer generates when operating normally in order to prevent, estimated current secondary circuit
The insulation of cable and AC input terminal etc. will meet the requirements, but if reactor after open circuit of secondary loop of current transformer
It breaks down again, the insulation of secondary winding and secondary device will be damaged.The China that publication No. is CN106684824A is specially
Sharp file discloses a kind of transformer differential protection method based on current transformer circuit supervision fail, in Cutoff current transformer disconnection
In the case of, if not breaking down, open differential protection；If breaking down, Blocking Differential Protection.This method is with accurate judgement
Premised on whether current transformer breaks, can effectively solve after current transformer circuit supervision fail differential protection may malfunction and again
When breaking down the problem of tripping.
Therefore, it is accurately judged to whether secondary loop of mutual inductor breaks, in secondary loop of mutual inductor broken string
In the case of, if reactor breaks down again, take effective measures insulation to avoid secondary winding and secondary device by
Damage becomes urgent problem to be solved.
Summary of the invention
The object of the present invention is to provide a kind of reactor current transformer disconnection recognition methods, differential protecting method and dresses
It sets, for solving the problems, such as whether accurate judgement reactor current mutual inductor breaks.
In order to solve the above technical problems, the present invention provides a kind of identification sides of high voltage reactor current transformer circuit supervision fail
Method, including following scheme:
Recognition methods scheme one: the following steps are included:
Judge whether the entry condition for meeting current transformer circuit supervision fail differentiation；
If meeting the entry condition, judge whether to meet following criterion:
(1) zero-sequence current of reactor local terminal is not zero after broken string differentiation starting and any phase phase current is zero；
(2) zero-sequence current of the reactor other end is zero when broken string differentiates starting and three-phase phase current is not zero；
(3) residual voltage of reactor head end is zero when broken string differentiates starting；
If above-mentioned criterion is all satisfied, after the delay time of setting, reactor current transformer disconnection is determined.
Recognition methods scheme two: on the basis of recognition methods scheme one, the mathematic(al) representation of condition (1) are as follows:
Wherein, 3I0.1(t) the zero-sequence current amplitude of reactor head end or tail end, I when differentiating starting for broken stringeFor reactor
Rated load current, K2For constant, value range is 0.4~0.6, IΦ1.min(t) reactor local terminal when differentiating starting for broken string
Three-phase phase current in minimum phase current magnitude, ISETFor reactor current threshold value, value range 0.04IN~0.1IN,
INFor bis- rated values of reactor CT；
The mathematic(al) representation of condition (2) are as follows:
Wherein, IΦ2(t) the three-phase phase current magnitude of the reactor other end, 3I when differentiating starting for broken string0.2It (t) is broken string
The zero-sequence current amplitude of the reactor other end, K when differentiating starting1For constant, value range is 0.15~0.25；
The mathematic(al) representation of condition (3) are as follows:
3U0(t) < USET
Wherein, 3U0(t) the residual voltage amplitude of reactor head end, U when differentiating starting for broken stringSETFor reactor head end zero
Sequence voltage threshold value, value range 0.06UN~0.1UN, UNFor bis- rated values of reactor PT.
Recognition methods scheme three: on the basis of recognition methods scheme one, the entry condition of current transformer circuit supervision fail differentiation
Mathematic(al) representation are as follows:
3I0.1(t) > K1Ie
Wherein, 3I0.1(t) the zero-sequence current amplitude of reactor head end or tail end, K when differentiating starting for broken string1For constant,
Value range is 0.15~0.25, IeFor the rated load current of reactor.
Recognition methods scheme four: on the basis of recognition methods scheme one or two, the delay time set is 6ms.
The present invention also provides differential protecting methods when a kind of high voltage reactor current transformer circuit supervision fail, including with lower section
Case:
Guard method scheme one: the following steps are included:
Judge whether reactor current mutual inductor breaks, wherein judging whether reactor current mutual inductor breaks including following
Step:
Judge whether the entry condition for meeting current transformer circuit supervision fail differentiation；
If meeting the entry condition, judge whether to meet following criterion:
(1) zero-sequence current of reactor local terminal is not zero after broken string differentiation starting and any phase phase current is zero；
(2) zero-sequence current of the reactor other end is zero when broken string differentiates starting and three-phase phase current is not zero；
(3) residual voltage of reactor head end is zero when broken string differentiates starting；
If above-mentioned criterion is all satisfied, after the delay time of setting, reactor current transformer disconnection is determined；
If reactor current transformer disconnection, selection locking or open differential protection；If selecting Blocking Differential Protection and again
It is secondary when breaking down, open differential protection.
Guard method scheme two: on the basis of guard method scheme one, select locking or opening differential by control word
Protection.
Guard method scheme three: on the basis of guard method scheme one or two, if entry condition or any criterion
When being unsatisfactory for, then the differentiation of reactor current transformer disconnection is exited, directly open differential protection.
Guard method scheme four: on the basis of guard method scheme one or two, the mathematic(al) representation of condition (1) are as follows:
Wherein, 3I0.1(t) the zero-sequence current amplitude of reactor head end or tail end, I when differentiating starting for broken stringeFor reactor
Rated load current, K2For constant, value range is 0.4~0.6, IΦ1.min(t) reactor local terminal when differentiating starting for broken string
Three-phase phase current in minimum phase current magnitude, ISETFor reactor current threshold value, value range 0.04IN~0.1IN,
INFor bis- rated values of reactor CT；
The mathematic(al) representation of condition (2) are as follows:
Wherein, IΦ2(t) the three-phase phase current magnitude of the reactor other end, 3I when differentiating starting for broken string0.2It (t) is broken string
The zero-sequence current amplitude of the reactor other end, K when differentiating starting1For constant, value range is 0.15~0.25；
The mathematic(al) representation of condition (3) are as follows:
3U0(t) < USET
Wherein, 3U0(t) the residual voltage amplitude of reactor head end, U when differentiating starting for broken stringSETFor reactor head end zero
Sequence voltage threshold value, value range 0.06UN~0.1UN, UNFor bis- rated values of reactor PT.
Guard method scheme five: on the basis of guard method scheme one or two, the starting of current transformer circuit supervision fail differentiation
The mathematic(al) representation of condition are as follows:
3I0.1(t) > K1Ie
Wherein, 3I0.1(t) the zero-sequence current amplitude of reactor head end or tail end, K when differentiating starting for broken string1For constant,
Value range is 0.15~0.25, IeFor the rated load current of reactor.
Guard method scheme six: on the basis of guard method scheme one or two, judge the mathematical table to break down again
Up to formula are as follows:
IΦ.max(t) > K3Ie
Wherein, IΦ.maxIt (t) is the maximum phase current amplitude in the three-phase phase current of reactor head end, K3For constant, value
Range is 1.1~1.3, IeFor the rated load current of reactor.
Guard method scheme seven: on the basis of guard method scheme one or two, the delay time set is 6ms.
The present invention also provides differential protection when a kind of high voltage reactor current transformer circuit supervision fail, including processing are single
Member, the processing unit is for executing instruction to realize following method:
Judge whether reactor current mutual inductor breaks, wherein judging whether reactor current mutual inductor breaks including following
Step:
Judge whether the entry condition for meeting current transformer circuit supervision fail differentiation；
If meeting the entry condition, judge whether to meet following criterion:
(1) zero-sequence current of reactor local terminal is not zero after broken string differentiation starting and any phase phase current is zero；
(2) zero-sequence current of the reactor other end is zero when broken string differentiates starting and three-phase phase current is not zero；
(3) residual voltage of reactor head end is zero when broken string differentiates starting；
If above-mentioned criterion is all satisfied, after the delay time of setting, reactor current transformer disconnection is determined；
If reactor current transformer disconnection, selection locking or open differential protection；If selecting Blocking Differential Protection and again
It is secondary when breaking down, open differential protection.
The beneficial effects of the present invention are:
It identifies whether current transformer breaks according to the feature of current transformer circuit supervision fail and failure, in addition introduces reactor
Head end voltage carries out subsidiary discriminant, can be accurately judged to whether reactor current mutual inductor breaks, and is the reliable of differential protection
Movement provides foundation.
In the case where being accurately judged to reactor current transformer disconnection, locking or open differential protection can choose；
In the case where selecting Blocking Differential Protection, if reactor breaks down again, open differential protection is controlled, differential protection is dynamic
Make, the insulation for effectively preventing secondary winding and secondary device is damaged, while preventing fault spread, ensure that power supply peace
Entirely.
In the case where being accurately judged to reactor current transformer disconnection, can select to be latched differential guarantor by control word
Shield, at this time it is possible to prevente effectively from the case where causing differential protection malfunction due to current transformer circuit supervision fail.
Detailed description of the invention
Fig. 1 is extra-high voltage reactor main electrical scheme schematic diagram；
The flow chart of differential protecting method when Fig. 2 is high voltage reactor current transformer circuit supervision fail.
Specific embodiment
With reference to the accompanying drawing and specific embodiment detailed description of the preferred embodiments.
Extra-high voltage reactor main electrical scheme schematic diagram is as shown in Figure 1, current transformer, the voltage of extra-high voltage reactor head end are mutual
Sensor is respectively CT1, PT, and the current transformer of extra-high voltage reactor tail end is CT2.Usual label ABC is that three-phase reactor is first
End, head end A, B, C phase are connected with route A, B, C respectively；Label XYZ is three-phase reactor tail end, and tail end A, B, C three-phase is shorted
After be directly grounded or be grounded through small reactor.
Knowledge below by taking extra-high voltage reactor main electrical scheme in Fig. 1 as an example, to reactor current transformer disconnection of the invention
Other method and differential protecting method describe in detail.The recognition methods of reactor current transformer disconnection and differential protecting method
It as an independent functional module, is placed in extra-high voltage reactor protective device, which puts into always.
Differential protecting method when high voltage reactor current transformer circuit supervision fail of the present invention is according to current transformer circuit supervision fail and event
The feature of barrier identifies current transformer circuit supervision fail, and the voltage in addition introducing reactor head end carries out subsidiary discriminant, improves extra-high
Press the reliability of reactor current transformer circuit supervision fail identification.In the case where secondary loop of mutual inductor broken string, according to reactance
Whether device breaks down, and control differential protection is open or is latched.For example, if CT2 breaks, working as CT1 when operating normally
Any phase phase current is greater than 1.2IeWhen, reactor differential protection will trip.High voltage reactor current transformer circuit supervision fail of the present invention
When differential protecting method flow chart it is as shown in Figure 2, comprising the following steps:
The first step, judges whether reactor current mutual inductor breaks, wherein judging whether reactor current mutual inductor breaks
The following steps are included:
Step A judges whether the entry condition for meeting current transformer circuit supervision fail differentiation, mathematic(al) representation are as follows:
3I0.1(t) > K1Ie
Wherein, 3I0.1(t) the zero-sequence current amplitude of reactor head end or tail end, I when differentiating starting for broken stringeFor reactor
Rated load current, K1For constant, value range is 0.15~0.25, can be according to actually being set, such as can be set
It is set to 0.15,0.20,0.25 etc..
If meeting above-mentioned entry condition, illustrate that reactor head end or tail end either side have zero-sequence current.
Step B judges whether to meet broken string and differentiates that the zero-sequence current of reactor local terminal after starting is not zero and any phase phase
Electric current is zero, mathematic(al) representation are as follows:
Wherein, K2For constant, value range is 0.4~0.6, can specifically be taken as 0.4,0.5,0.6 equivalence；IΦ1.min(t)
Minimum phase current magnitude when differentiating starting for broken string in the three-phase phase current of reactor local terminal, ISETFor reactor current threshold
Value, value range 0.04IN~0.1IN, INFor bis- rated values of reactor CT, it can specifically be taken as 0.04IN、0.08IN、
0.1INIt is equivalent.
If meeting the condition of above-mentioned steps B, reactor local terminal has zero-sequence current and has any after illustrating broken string differentiation starting
Phase phase current is without stream.In addition, in the present embodiment, bis- rated value I of reactor CTNFor 1A or 5A.
Step C judges whether that meeting the zero-sequence current of reactor other end when broken string differentiates starting is zero and three-phase phase electricity
Stream is not zero, mathematic(al) representation are as follows:
Wherein, IΦ2(t) A, B, C three-phase phase current magnitude of the reactor other end, 3I when differentiating starting for broken string0.2(t)
The zero-sequence current amplitude of reactor other end when differentiating starting for broken string.
If meeting the condition of above-mentioned steps C, illustrate reactor other end non-zero-sequence current and three-phase when broken string differentiates starting
Electric current has stream.
Step D judges whether that meeting the residual voltage of reactor head end when broken string differentiates starting is zero, mathematic(al) representation
Are as follows:
3U0(t) < USET
Wherein, 3U0(t) the residual voltage amplitude of reactor head end, U when differentiating starting for broken stringSETFor reactor head end zero
Sequence voltage threshold value, value range 0.06UN~0.1UN, UNFor bis- rated values of reactor PT, specifically can be with value
0.06UN、0.08UN、0.1UNIt is equivalent.
If meeting the condition of above-mentioned steps D, illustrate that reactor head end is without residual voltage when broken string differentiates starting.In this implementation
In example, bis- rated value U of anti-device PTNIt is taken as 57.7V.
Step E after the delay time of setting, determines reactor current mutual inductance if above-mentioned steps A, B, C, D are set up
Device broken string.
Delay time can be set according to the actual situation, for example, can be set as 6ms.
Second step, if reactor current transformer disconnection, selection locking or open differential protection；If selection is latched differential guarantor
When protecting and breaking down again, open differential protection.
Specifically, judging whether the mathematic(al) representation to break down again are as follows:
IΦ.max(t) > K3Ie
Wherein, IΦ.maxIt (t) is the maximum phase current amplitude in the three-phase phase current of reactor head end, K3For constant, value
Range is 1.1~1.3, can specifically be taken as 1.1,1.2,1.3 equivalences.
It should be noted that, when either step is unsatisfactory for, it is disconnected to exit current transformer in above-mentioned steps A, B, C and D
Line differentiates, directly opens differential protection.When step A, B, C and D are all satisfied, current transformer is judged to by setting delay time
Broken string.
After determining reactor current transformer disconnection, Blocking Differential Protection can be chosen whether by control word.Selection
Not when Blocking Differential Protection, generate electricity current transformer wire break alarm signal, directly open differential protection；Select Blocking Differential Protection
When, power generation current transformer wire break alarm signal and Blocking Differential Protection.After current transformer circuit supervision fail, if selection is latched differential guarantor
Shield reliably opens differential protection when breaking down again, can solve after current transformer circuit supervision fail differential protection may malfunction and
When breaking down again the problem of differential relay fail.
The present invention is that the current transformer circuit supervision fail of either end when being operated normally based on extra-high voltage reactor is differentiated, does not include two
End while there is a phenomenon where breaking, can reliable recognition extra-high voltage reactor either end be single-phase or biphase current transformer disconnection.
The present invention also provides differential protection when a kind of high voltage reactor current transformer circuit supervision fail, the differential protections
Device includes processing unit, and processing unit is for executing instruction to realize following method:
Judge whether reactor current mutual inductor breaks, wherein judging whether reactor current mutual inductor breaks including following
Step:
Judge whether the entry condition for meeting current transformer circuit supervision fail differentiation；
If meeting the entry condition, judge whether to meet following criterion:
(1) zero-sequence current of reactor local terminal is not zero after broken string differentiation starting and any phase phase current is zero；
(2) zero-sequence current of the reactor other end is zero when broken string differentiates starting and three-phase phase current is not zero；
(3) residual voltage of reactor head end is zero when broken string differentiates starting；
If above-mentioned criterion is all satisfied, after the delay time of setting, reactor current transformer disconnection is determined；
If reactor current transformer disconnection, selection locking or open differential protection；If selecting Blocking Differential Protection and again
It is secondary when breaking down, open differential protection.
The differential protection that the differential protection is practical when can be achieved on above-mentioned high voltage reactor current transformer circuit supervision fail
A kind of hardware configuration of method, since differential protecting method being described in detail, details are not described herein again.
Claims (10)
1. a kind of recognition methods of high voltage reactor current transformer circuit supervision fail, which comprises the following steps:
Judge whether the entry condition for meeting current transformer circuit supervision fail differentiation；
If meeting the entry condition, judge whether to meet following criterion:
(1) zero-sequence current of reactor local terminal is not zero after broken string differentiation starting and any phase phase current is zero；
(2) zero-sequence current of the reactor other end is zero when broken string differentiates starting and three-phase phase current is not zero；
(3) residual voltage of reactor head end is zero when broken string differentiates starting；
If above-mentioned criterion is all satisfied, after the delay time of setting, reactor current transformer disconnection is determined；
The mathematic(al) representation of condition (1) are as follows:
Wherein, 3I0.1(t) the zero-sequence current amplitude of reactor head end or tail end, I when differentiating starting for broken stringeFor the volume of reactor
Constant load electric current, K2For constant, value range is 0.4~0.6, IΦ1.min(t) the three of reactor local terminal when differentiating starting for broken string
Minimum phase current magnitude in phase phase current, ISETFor reactor current threshold value, value range 0.04IN~0.1IN, INFor
Bis- rated values of reactor CT；
The mathematic(al) representation of condition (2) are as follows:
Wherein, IΦ2(t) the three-phase phase current magnitude of the reactor other end, 3I when differentiating starting for broken string0.2(t) differentiate for broken string
The zero-sequence current amplitude of the reactor other end, K when starting1For constant, value range is 0.15~0.25；
The mathematic(al) representation of condition (3) are as follows:
3U0(t) < USET
Wherein, 3U0(t) the residual voltage amplitude of reactor head end, U when differentiating starting for broken stringSETFor reactor head end zero sequence electricity
Pressure gate threshold value, value range 0.06UN~0.1UN, UNFor bis- rated values of reactor PT.
2. the recognition methods of high voltage reactor current transformer circuit supervision fail according to claim 1, which is characterized in that electric current is mutual
The mathematic(al) representation for the entry condition that sensor broken string differentiates are as follows:
3I0.1(t) > K1Ie
Wherein, 3I0.1(t) the zero-sequence current amplitude of reactor head end or tail end, K when differentiating starting for broken string1For constant, value model
It encloses for 0.15~0.25, IeFor the rated load current of reactor.
3. the recognition methods of high voltage reactor current transformer circuit supervision fail according to claim 1, which is characterized in that described to set
Fixed delay time is 6ms.
4. differential protecting method when a kind of high voltage reactor current transformer circuit supervision fail, which comprises the following steps:
Judge whether reactor current mutual inductor breaks, wherein judging whether reactor current mutual inductor breaks including following step
It is rapid:
Judge whether the entry condition for meeting current transformer circuit supervision fail differentiation；
If meeting the entry condition, judge whether to meet following criterion:
(1) zero-sequence current of reactor local terminal is not zero after broken string differentiation starting and any phase phase current is zero；
(2) zero-sequence current of the reactor other end is zero when broken string differentiates starting and three-phase phase current is not zero；
(3) residual voltage of reactor head end is zero when broken string differentiates starting；
If above-mentioned criterion is all satisfied, after the delay time of setting, reactor current transformer disconnection is determined；
If reactor current transformer disconnection, selection locking or open differential protection；If selecting Blocking Differential Protection and sending out again
When raw failure, open differential protection；
The mathematic(al) representation of condition (1) are as follows:
Wherein, 3I0.1(t) the zero-sequence current amplitude of reactor head end or tail end, I when differentiating starting for broken stringeFor the volume of reactor
Constant load electric current, K2For constant, value range is 0.4~0.6, IΦ1.min(t) the three of reactor local terminal when differentiating starting for broken string
Minimum phase current magnitude in phase phase current, ISETFor reactor current threshold value, value range 0.04IN~0.1IN, INFor
Bis- rated values of reactor CT；
The mathematic(al) representation of condition (2) are as follows:
Wherein, IΦ2(t) the three-phase phase current magnitude of the reactor other end, 3I when differentiating starting for broken string0.2(t) differentiate for broken string
The zero-sequence current amplitude of the reactor other end, K when starting1For constant, value range is 0.15~0.25；
The mathematic(al) representation of condition (3) are as follows:
3U0(t) < USET
Wherein, 3U0(t) the residual voltage amplitude of reactor head end, U when differentiating starting for broken stringSETFor reactor head end zero sequence electricity
Pressure gate threshold value, value range 0.06UN~0.1UN, UNFor bis- rated values of reactor PT.
5. differential protecting method when high voltage reactor current transformer circuit supervision fail according to claim 4, which is characterized in that
Locking or open differential protection are selected by control word.
6. differential protecting method when high voltage reactor current transformer circuit supervision fail according to claim 4 or 5, feature exist
In, if entry condition or any criterion are unsatisfactory for, the differentiation of reactor current transformer disconnection is exited, it is directly open poor
Dynamic protection.
7. differential protecting method when high voltage reactor current transformer circuit supervision fail according to claim 4 or 5, feature exist
In the mathematic(al) representation for the entry condition that current transformer circuit supervision fail differentiates are as follows:
3I0.1(t) > K1Ie
Wherein, 3I0.1(t) the zero-sequence current amplitude of reactor head end or tail end, K when differentiating starting for broken string1For constant, value model
It encloses for 0.15~0.25, IeFor the rated load current of reactor.
8. differential protecting method when high voltage reactor current transformer circuit supervision fail according to claim 4 or 5, feature exist
In the mathematic(al) representation that judgement is broken down again are as follows:
IΦ.max(t) > K3Ie
Wherein, IΦ.maxIt (t) is the maximum phase current amplitude in the three-phase phase current of reactor head end, K3For constant, value range
For 1.1~1.3, IeFor the rated load current of reactor.
9. differential protecting method when high voltage reactor current transformer circuit supervision fail according to claim 4 or 5, feature exist
In the delay time set is 6ms.
10. differential protection when a kind of high voltage reactor current transformer circuit supervision fail, which is characterized in that including processing unit,
The processing unit is for executing instruction to realize following method:
Judge whether reactor current mutual inductor breaks, wherein judging whether reactor current mutual inductor breaks including following step
It is rapid:
Judge whether the entry condition for meeting current transformer circuit supervision fail differentiation；
If meeting the entry condition, judge whether to meet following criterion:
(1) zero-sequence current of reactor local terminal is not zero after broken string differentiation starting and any phase phase current is zero；
(2) zero-sequence current of the reactor other end is zero when broken string differentiates starting and three-phase phase current is not zero；
(3) residual voltage of reactor head end is zero when broken string differentiates starting；
If above-mentioned criterion is all satisfied, after the delay time of setting, reactor current transformer disconnection is determined；
If reactor current transformer disconnection, selection locking or open differential protection；If selecting Blocking Differential Protection and sending out again
When raw failure, open differential protection；
The mathematic(al) representation of condition (1) are as follows:
Wherein, 3I0.1(t) the zero-sequence current amplitude of reactor head end or tail end, I when differentiating starting for broken stringeFor the volume of reactor
Constant load electric current, K2For constant, value range is 0.4~0.6, IΦ1.min(t) the three of reactor local terminal when differentiating starting for broken string
Minimum phase current magnitude in phase phase current, ISETFor reactor current threshold value, value range 0.04IN~0.1IN, INFor
Bis- rated values of reactor CT；
The mathematic(al) representation of condition (2) are as follows:
Wherein, IΦ2(t) the three-phase phase current magnitude of the reactor other end, 3I when differentiating starting for broken string0.2(t) differentiate for broken string
The zero-sequence current amplitude of the reactor other end, K when starting1For constant, value range is 0.15~0.25；
The mathematic(al) representation of condition (3) are as follows:
3U0(t) < USET
Wherein, 3U0(t) the residual voltage amplitude of reactor head end, U when differentiating starting for broken stringSETFor reactor head end zero sequence electricity
Pressure gate threshold value, value range 0.06UN~0.1UN, UNFor bis- rated values of reactor PT.
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| CN201910380122.0A CN110098596B (en) | 2017-12-28 | 2017-12-28 | Method and device for recognizing disconnection of current transformer of reactor and performing differential protection |
| CN201711460738.6A CN108134372B (en) | 2017-12-28 | 2017-12-28 | The recognition methods of reactor current transformer disconnection, differential protecting method and device |
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| CN110082644B (en) * | 2019-05-23 | 2022-03-15 | 国电南瑞科技股份有限公司 | Relay protection circuit CT disconnection identification method and power transmission line fault location method |
| CN112557957A (en) * | 2019-09-09 | 2021-03-26 | 南京南瑞继保工程技术有限公司 | Method, device and system for judging PT (potential transformer) disconnection of magnetic control type controllable shunt reactor |
| CN112350275B (en) * | 2020-09-30 | 2023-03-24 | 国网宁夏电力有限公司检修公司 | Current transformer disconnection identification method, protection method, medium and system |
| CN112736867B (en) * | 2020-12-16 | 2023-12-01 | 北京四方继保工程技术有限公司 | Method and system for rapidly judging CT disconnection of line protection device |
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