CN105006802B - Reactor protection method based on electric current than width formula order components - Google Patents
Reactor protection method based on electric current than width formula order components Download PDFInfo
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- CN105006802B CN105006802B CN201510416643.9A CN201510416643A CN105006802B CN 105006802 B CN105006802 B CN 105006802B CN 201510416643 A CN201510416643 A CN 201510416643A CN 105006802 B CN105006802 B CN 105006802B
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Abstract
The invention discloses a kind of reactor protection method based on electric current than width formula order components, judge whether broken down inside reactor with the phasor difference of negative-sequence current respectively by comparing the reverse vector of failure phase forward-order current and forward-order current.If the phasor difference of forward-order current and negative-sequence current is less than the phasor difference of forward-order current reverse vector and negative-sequence current, then it is assumed that troubles inside the sample space occurs for reactor；The present invention can recognize reactor earth fault, phase fault and turn-to-turn fault, it is necessary to which the electricity of collection is few, and criterion is succinct；Particularly with turn-to-turn short circuit, compared with the interturn protection principle based on zero sequence impedance and zero sequence direction, criterion is not broken independent of voltage by shadow PT, and turn-to-turn fault occurs when breaking to PT and is based on remaining to correct operation than width formula order components protection philosophy.
Description
Technical field
Relay Protection Technology in Power System field of the present invention, has to reactor earth fault, phase-to phase fault, turn-to-turn fault
Preferable protection sensitivity, more particularly to a kind of reactor unbalanced fault determination methods based on electric current than width formula order components.
Background technology
In high pressure long range transmission line, in order to suppress power-frequency overvoltage, compensated line capacity current can typically be configured
High-voltage shunt reactor, reactor is linked together all the time with circuit, as a part for transmission line, therefore the fortune of reactor
Market condition directly affects the safe and reliable operation of transmission line.
Reactor typically configures differential protection as the main protection of earth fault and phase fault, configures interturn protection
It is used as the main protection of shorted-turn fault.But for reactor output end (end) through high resistance earthing fault and small turn-to-turn fault
When, differential protection and interturn protection sensitivity are not enough, it is impossible to effectively reflection high resistance earthing fault and small turn-to-turn fault, and turn-to-turn
Protection is generally using zero sequence power direction or zero sequence impedance orientation principle, it is necessary to calculate electric current and voltage, when PT is disconnected simultaneously
During line, interturn protection failure.
The content of the invention
In order to solve prior art problem, the present invention provides a kind of more asymmetric than the reactor of width formula order components based on electric current
Fault judgment method, by comparing each order components amplitude of electric current, reflects the unbalanced fault and turn-to-turn fault of reactor, due to not
Dependent on voltage, compared with the interturn protection principle based on zero sequence impedance and zero sequence direction, still can in the case of PT broken strings
Enough reflect inductor turn-to-turn fault.
To achieve the above objectives, the present invention is realized using following technical scheme.
The technical solution adopted by the present invention is：
Reactor protection method based on electric current than width formula order components, comprises the following steps：
(1) three-phase current of reactor head end, is gathered, the arrow of forward-order current, negative-sequence current and zero-sequence current is calculated respectively
Amount；
(2) the phasor difference M2 of forward-order current and negative-sequence current, forward-order current reverse vector and negative-sequence current vector, are calculated
Poor M2 '；
(3), compare M2, M2 ' mould size, when M2 mould be less than M2 ' mould, be judged as Reactor Fault, when M2's
When mould is more than M2 ' mould, external area error is judged to.
More preferably, the step (2) also includes, and calculates the phasor difference N2 of forward-order current and zero-sequence current, forward-order current
The phasor difference N2 ' of reverse vector and zero-sequence current；
Accordingly, the step (3) also includes, and compares N2, N2 ' mould size, when N2 mould be less than N2 ' mould, sentence
Break as Reactor Fault, when N2 mould is more than N2 ' mould, be judged to external area error.
Compared with prior art, beneficial effect of the present invention includes：
The invention provides a kind of reactor unbalanced fault determination methods based on electric current than width formula order components, by than
Compared with each order components amplitude identification reactor unbalanced fault of electric current and turn-to-turn fault；
Criterion of the present invention need to only gather reactor head end three-phase current, it is not necessary to gather three-phase voltage, it is necessary to the electricity of collection
Amount is few, and criterion is succinct；
Because criterion of the present invention is independent of voltage, with the interturn protection principle phase based on zero sequence impedance and zero sequence direction
Interturn protection is unaffected when breaking than PT.
Brief description of the drawings
A phase current order components schematic diagrames during A phase earth faults in Fig. 1 a reactors area；
A phase current order components schematic diagrames during A phase earth faults outside Fig. 1 b reactors area；
A phase current order components schematic diagrames when A, B phase fault in Fig. 2 a reactors area；
A phase current order components schematic diagrames when A, B phase fault outside Fig. 2 b reactors area；
A phase current order components schematic diagrames when A, B ground short circuit failure in Fig. 3 a reactors area；
A phase current order components schematic diagrames when A, B ground short circuit failure outside Fig. 3 b reactors area；
A phase current order components schematic diagrames during A phase turn-to-turn short circuits in Fig. 4 a reactors area；
A phase current order components schematic diagrames during A phase earth faults outside Fig. 4 b reactors area.
I0, I1, I2 are respectively the zero-sequence current, forward-order current and negative-sequence current of reactor head end in Fig. 1 a~Fig. 4 b.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings.
Reactor protection method based on electric current than width formula order components, comprises the following steps：
(1) three-phase current of reactor head end, is gathered, the arrow of forward-order current, negative-sequence current and zero-sequence current is calculated respectively
Amount；
(2) the phasor difference M2 of forward-order current and negative-sequence current, forward-order current reverse vector and negative-sequence current vector, are calculated
Poor M2 '；Calculate the phasor difference N2 of forward-order current and zero-sequence current, the reverse vector of forward-order current and the phasor difference of zero-sequence current
N2’；
(3), compare M2, M2 ' mould size, when M2 mould be less than M2 ' mould, be judged as Reactor Fault, when M2's
When mould is more than M2 ' mould, external area error is judged to；If step (2) calculates the phasor difference N2 of forward-order current and zero-sequence current, just
The reverse vector of sequence electric current and the phasor difference N2 ' of zero-sequence current, compare N2, N2 ' mould size, when N2 mould is less than N2 '
Mould, is judged as Reactor Fault, when N2 mould is more than N2 ' mould, is judged to external area error.
Due to failure between forward-order current, zero-sequence current calculating non-reaction phase, so in addition to phase-to phase fault, using positive-negative sequence meter
Calculate or both effects for being calculated using positive zero sequence is identical；Therefore, it is possible to by N2, N2 ' judge the asymmetric former of reactor
Barrier, the accuracy that further validation fault judges.
When reactor is normally run, electric current positive-sequence component is normal value, negative sequence component and zero-sequence component very little.Work as reactor
Inside and outside generating region during unbalanced fault, negative sequence component, zero-sequence component will increase.
A phase forward-order currents I1, negative-sequence current I2, zero-sequence current I0 and meter when Fig. 1 a are A phase earth faults in reactor area
Obtained M2, M2 ' current vector schematic diagram.Now M2 ' as shown>M2.
Forward-order current I1, negative-sequence current I2, zero-sequence current I0 and calculated when Fig. 1 b are A phase earth faults outside reactor area
M2, M2 arrived ' current vector schematic diagram.Now M2 ' as shown<M2.
A phase forward-order currents I1, negative-sequence current I2, zero-sequence current I0 and meter when Fig. 2 a are A, B phase fault in reactor area
Obtained M2, M2 ' current vector schematic diagram.Now M2 ' as shown>M2.
Forward-order current I1, negative-sequence current I2, zero-sequence current I0 and calculated when Fig. 2 b are A, B phase fault outside reactor area
M2, M2 arrived ' current vector schematic diagram.Now M2 ' as shown<M2.
A phase forward-order currents I1, negative-sequence current I2, zero-sequence current I0 when Fig. 3 a are the alternate ground short circuit of A, B in reactor area
M2, M2 obtained with calculating ' current vector schematic diagram.Now M2 ' as shown>M2.
A phase forward-order currents I1, negative-sequence current I2, zero-sequence current I0 when Fig. 3 b are the alternate ground short circuit of A, B outside reactor area
M2, M2 obtained with calculating ' current vector schematic diagram.Now M2 ' as shown<M2.
A phase forward-order currents I1, negative-sequence current I2, zero-sequence current I0 and calculated when Fig. 4 a are reactor A phase turn-to-turn short circuits
M2, M2 arrived ' current vector schematic diagram.Now M2 ' as shown>M2.
Forward-order current I1, negative-sequence current I2, zero-sequence current I0 and calculated when Fig. 4 b are A phase earth faults outside reactor area
M2, M2 arrived ' current vector schematic diagram.Now M2 ' as shown<M2.
According to above-mentioned 4 kinds of fault type single-phase earthings, phase-to phase fault, mutually calculate indirectly with turn-to-turn fault analysis draw as
Draw a conclusion：When unbalanced fault in reactor generating region and turn-to-turn fault, the vector of failure phase forward-order current and negative-sequence current
Poor M2 is certainly less than forward-order current reverse vector and the phasor difference M2 ' of negative-sequence current.
When unbalanced fault outside reactor generating region, the phasor difference M2 of failure phase forward-order current and negative-sequence current is necessarily big
In forward-order current reverse vector and the phasor difference M2 ' of negative-sequence current.
By comparing two vectors M2, M2 ' modulus value can determine whether whether occur unbalanced fault in reactor area.
The phasor difference N2 for comparing forward-order current and zero-sequence current again by calculating, the reverse vector and zero sequence of forward-order current
The phasor difference N2 ' of electric current, in addition to failure between non-reaction phase, other unbalanced faults and turn-to-turn fault can also draw identical knot
By.
Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (1)
1. the reactor protection method based on electric current than width formula order components, it is characterised in that comprise the following steps：
(1) three-phase current of reactor head end, is gathered, the vector of forward-order current, negative-sequence current and zero-sequence current is calculated respectively；
(2) the phasor difference M2 of forward-order current and negative-sequence current, forward-order current reverse vector and negative-sequence current phasor difference, are calculated
M2’；Calculate the phasor difference N2 of forward-order current and zero-sequence current, the reverse vector of forward-order current and the phasor difference N2 ' of zero-sequence current；
(3), compare M2, M2 ' mould size, when M2 mould be less than M2 ' mould, be judged as Reactor Fault, when M2 mould is big
When M2 ' mould, external area error is judged to；Compare N2, N2 ' mould size, when N2 mould be less than N2 ' mould, be judged as reactance
Device failure, when N2 mould is more than N2 ' mould, is judged to external area error.
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| CN201510416643.9A CN105006802B (en) | 2015-07-15 | 2015-07-15 | Reactor protection method based on electric current than width formula order components |
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| CN105006802B true CN105006802B (en) | 2017-10-31 |
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| CN106532641A (en) * | 2016-12-26 | 2017-03-22 | 云南电网有限责任公司电力科学研究院 | Protection method of parallel dry type air-core reactor based on current and voltage phase angles |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1652424A (en) * | 2005-01-13 | 2005-08-10 | 天津大学 | Protecting method for short-circuit between wire coils of parallel reactor of ultrahigh voltage transmission line |
| CN101071151A (en) * | 2006-05-08 | 2007-11-14 | 许继集团有限公司 | Amplitude-comparison zero sequence direction relay reactor inter-turn fault measuring method |
| CN101207272A (en) * | 2007-11-16 | 2008-06-25 | 国电南京自动化股份有限公司 | Turn space protection for reactor sequence component direction |
| CN101614779A (en) * | 2008-12-30 | 2009-12-30 | 许继集团有限公司 | Differentiate the method for shunt reactor turn-to-turn short circuit, line to line fault and single-phase short circuit |
| WO2015070407A1 (en) * | 2013-11-13 | 2015-05-21 | Siemens Aktiengesellschaft | Method and apparatus of reactor turn-to-turn protection |
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- 2015-07-15 CN CN201510416643.9A patent/CN105006802B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1652424A (en) * | 2005-01-13 | 2005-08-10 | 天津大学 | Protecting method for short-circuit between wire coils of parallel reactor of ultrahigh voltage transmission line |
| CN101071151A (en) * | 2006-05-08 | 2007-11-14 | 许继集团有限公司 | Amplitude-comparison zero sequence direction relay reactor inter-turn fault measuring method |
| CN101207272A (en) * | 2007-11-16 | 2008-06-25 | 国电南京自动化股份有限公司 | Turn space protection for reactor sequence component direction |
| CN101614779A (en) * | 2008-12-30 | 2009-12-30 | 许继集团有限公司 | Differentiate the method for shunt reactor turn-to-turn short circuit, line to line fault and single-phase short circuit |
| WO2015070407A1 (en) * | 2013-11-13 | 2015-05-21 | Siemens Aktiengesellschaft | Method and apparatus of reactor turn-to-turn protection |
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