CN107276044A - A kind of method and apparatus of anti-acceleration distance malfunction - Google Patents
A kind of method and apparatus of anti-acceleration distance malfunction Download PDFInfo
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- CN107276044A CN107276044A CN201710271652.2A CN201710271652A CN107276044A CN 107276044 A CN107276044 A CN 107276044A CN 201710271652 A CN201710271652 A CN 201710271652A CN 107276044 A CN107276044 A CN 107276044A
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- 230000007257 malfunction Effects 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000001133 acceleration Effects 0.000 claims abstract description 50
- 238000005070 sampling Methods 0.000 claims description 8
- 230000005284 excitation Effects 0.000 abstract description 13
- 230000005611 electricity Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
Classifications
-
- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
-
- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
It is an object of the invention to provide a kind of method and apparatus of anti-acceleration distance malfunction, when hand closes or overlaps the breaker of certain phase, judge whether the phase meets original value criterion, differential value criterion or voltage criterion；If it is satisfied, then the acceleration distance of the phase is opened.Technical scheme provided by the present invention, when hand is closed or overlaps breaker, employs original value criterion, differential value criterion and voltage criterion, determines whether to open acceleration distance.When reducing impedance due to the excitation surge current of transformer in circuit, it is impossible to meet these three criterions, even if certain mutually detects faulty presence, acceleration distance is not also opened, therefore does not result in the misoperation of acceleration distance.Technical scheme provided by the present invention, judges that the mode whether acceleration distance acts is fairly simple, and the foundation judged is actual voltage and the magnitude of current in circuit, so judged result is more accurate.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System field, and in particular to a kind of method of anti-acceleration distance malfunction and
Device.
Background technology
In the running of power system, overhead transmission line failure is mostly transient fault, as caused by thunder and lightning absolutely
Edge dielectric surface flashover, big wind-induced short in short-term, short circuit etc. caused by the things such as birds or branch drop on wire, this
On-line Fault road is planted by after the rapid action control breaker disconnection of relay protection, the dielectric level of trouble point can voluntarily recover, therefore
Barrier disappears.Now, if the line-breaker of disconnection is closed again, it becomes possible to recover normal power supply, if open circuit is thought highly of
Failure is not eliminated after newly closing, then the failure is permanent fault, and breaker disconnects again, i.e., accelerate after relay protection dynamic
Make.
Distance protection is the distance of reaction protection installation place to trouble point, and determines actuation time according to the distance of distance
A kind of protection device.The distance of measurement protection installation place to trouble point, is actually according to measurement protection installation place to failure
What the impedance magnitude between point was determined, therefore this protection is also known as impedance protection.The protection of distance protection is that have certain limit
, if in the range of failure appears in the distance protection, the protection act.
But when the transformer in circuit produces excitation surge current, the measured value that can result in line impedance reduces, in weight
Acceleration distance malfunction is may result in when combined floodgate or closing by hand, so that measurement impedance enters apart from three section protection.Periodical《It is lucky
Woods electric power》The 1st phase of volume 37 describe the paper of one entitled " harm of transformer excitation flow and Prevention method ", to becoming
Depressor excitation surge current causes distribution line misoperation to be described in detail.But the paper is not introduced and how judged in circuit
Transformer whether generate excitation surge current, so can not prevent due to the acceleration distance that transformer excitation flow is caused in circuit
Misoperation.
The content of the invention
It is an object of the invention to provide a kind of method and apparatus of anti-acceleration distance malfunction, for solving in the prior art
Due to there is excitation surge current in circuit and cause acceleration distance misoperation the problem of.
To achieve the above object, the technical scheme that provides of the present invention is：
A kind of method of anti-acceleration distance malfunction, including when hand closes or overlaps the breaker of certain phase, whether judge the phase
Meet original value criterion, differential value criterion or voltage criterion；If it is satisfied, then the step that the acceleration distance of the phase is opened；
The criterion of the primary criterion is：
WhenWhen, sampled point quantity M1 ＞ N1；And
WhenWhen, sampled point quantity M2 ＞ N2；
WhereinFor the amplitude of the phase current sampling point,For the phase current in the first setting time it is maximum
Sampled value, k1And k2For corresponding coefficient, it is all higher than 0 and is less than 1, and k2＞ k1；N1 is the quantity of the first low threshold, and N2 is first
The quantity of high threshold；
The criterion of the differential value criterion is：
WhenWhen, sampled point quantity Z1 ＞ S1；And
WhenWhen, the quantity Z2 ＞ S2 of sampled point；
WhereinFor the amplitude after the phase current differential；For after the phase current differential second set when
Interior maximum, l1And l2For corresponding coefficient, it is all higher than 0 and is less than 1, and l2＞ l1, S1 is the quantity of the second low threshold, S2
For the quantity of the second high threshold；
The criterion of the voltage criterion is：
The phase voltage of the phaseAnd the phase and the voltage between phases between other phases
Further, first setting time and the second setting time are corresponding one and use cycle, k1And k2Point
Wei 0.2 and 0.5, l1And l2Respectively 0.2 and 0.5, N1 and N2 be respectively 18 and 13, S1 and S2 are respectively 19 and 13, X and Y points
Wei 40 and 70.
A kind of device of anti-acceleration distance malfunction, including when hand closes or overlaps the breaker of certain phase, whether judge the phase
Meet original value criterion, differential value criterion or voltage criterion；If it is satisfied, then the module that the acceleration distance of the phase is opened；
The criterion of the primary criterion is：
WhenWhen, sampled point quantity M1 ＞ N1；And
WhenWhen, sampled point quantity M2 ＞ N2；
WhereinFor the amplitude of the phase current sampling point,Adopted for phase electricity is maximum in the first setting time
Sample value, k1And k2For corresponding coefficient, it is all higher than 0 and is less than 1, and k2＞ k1；N1 is the quantity of the first low threshold, and N2 is first high
The quantity of threshold；
The criterion of the differential value criterion is：
WhenWhen, sampled point quantity Z1 ＞ S1；And
WhenWhen, the quantity Z2 ＞ S2 of sampled point；
WhereinFor the amplitude after the phase current differential；For after the phase current differential second set when
Interior maximum, l1And l2For corresponding coefficient, it is all higher than 0 and is less than 1, and l2＞ l1, S1 is the quantity of the second low threshold, S2
For the quantity of the second high threshold；
The criterion of the voltage criterion is：
The phase voltage of the phaseAnd the phase and the voltage between phases between other phases
Further, first setting time and the second setting time are corresponding one and use cycle, k1And k2Point
Wei 0.2 and 0.5, l1And l2Respectively 0.2 and 0.5, N1 and N2 be respectively 18 and 13, S1 and S2 are respectively 19 and 13, X and Y points
Wei 40 and 70.
The beneficial effects of the invention are as follows：Technical scheme provided by the present invention, when hand is closed or overlaps breaker, is employed
Original value criterion, differential value criterion and voltage criterion, determine whether to open acceleration distance.When encouraging due to transformer in circuit
When magnetic shoves and reduces impedance, it is impossible to meet these three criterions, even if certain mutually detects faulty presence, acceleration distance is not yet
It is open, therefore do not result in the misoperation of acceleration distance.Technical scheme provided by the present invention, judges whether acceleration distance acts
Mode it is fairly simple, and the foundation judged is actual voltage and the magnitude of current in circuit, so judged result is more accurate
Really.
Brief description of the drawings
Fig. 1 is the working line schematic diagram with transformer in embodiment；
Fig. 2 is the logic chart of each criterion in embodiment；
Fig. 3 is the waveform of excitation surge current in embodiment；
Fig. 4 is to the schematic diagram of anti-acceleration distance malfunction method validation in embodiment.
Embodiment
It is an object of the invention to provide a kind of method and apparatus of anti-acceleration distance malfunction, for solving in the prior art
Due to there is excitation surge current in circuit and cause acceleration distance misoperation the problem of.
To achieve the above object, the technical scheme that provides of the present invention is：
Embodiment of the method：
A kind of method of anti-acceleration distance malfunction, when hand closes or overlaps the breaker of certain phase, judges whether the phase meets
Original value criterion, differential value criterion or voltage criterion；If it is satisfied, then the acceleration distance of the phase is opened；
The criterion of the primary criterion is：
WhenWhen, sampled point quantity M1 ＞ N1；And
WhenWhen, sampled point quantity M2 ＞ N2；
WhereinFor the amplitude of the phase current sampling point,For the phase current in the first setting time it is maximum
Sampled value, k1And k2For corresponding coefficient, it is all higher than 0 and is less than 1, and k2＞ k1；N1 is the quantity of the first low threshold, and N2 is first
The quantity of high threshold；
The criterion of the differential value criterion is：
WhenWhen, sampled point quantity Z1 ＞ S1；And
WhenWhen, the quantity Z2 ＞ S2 of sampled point；
WhereinFor the amplitude after the phase current differential；For the second setting time after the phase current differential
Interior maximum, l1And l2For corresponding coefficient, it is all higher than 0 and is less than 1, and l2＞ l1, S1 is the quantity of the second low threshold, and S2 is
The quantity of second high threshold；
The criterion of the voltage criterion is：
The phase voltage of the phaseAnd the phase and the voltage between phases between other phases
Embodiments of the present invention are described further below in conjunction with the accompanying drawings.
Anti- acceleration distance malfunction embodiment of the method
The present embodiment provides a kind of method of anti-acceleration distance malfunction, it is adaptable to which the working line with transformer, is to pass through
In the program of line protective devices, establishment judges the criterion of acceleration distance whether is opened in each phase line, so as to ensure to accelerate
The correctness of distance action.
Circuit with transformer station high-voltage side bus is used for as shown in figure 1, wherein TA1, TA2 and TA3 are respectively three current transformers
Detect the three-phase current of circuit；TV1, TV2 and TV3 are respectively three voltage transformers, the three-phase voltage for detecting circuit.
The present embodiment provides the criterion of no open acceleration distance, including original value criterion, differential value criterion and electricity
Criterion is pressed, when hand is closed or automatic reclosing is with transformer, if certain mutually meets one of criterion, the acceleration of the phase is opened
Distance, does not otherwise open the acceleration distance of the phase, decision logic is as shown in Fig. 2 each criterion is as follows：
Original value criterion：
The criterion of this criterion is：
WhenWhen, sampled point quantity M1 ＞ N1；And
WhenWhen, sampled point quantity M2 ＞ N2；
WhereinFor the amplitude of the phase current sampling point,For sampled value maximum in the cycle of phase current one,
k1And k2For corresponding coefficient, it is all higher than 0 and is less than 1, and k2＞ k1；N1 is the quantity of the first low threshold, and N2 is the first high threshold
Quantity.K in above-mentioned criterion1、k2, N1 and N2 be all to be determined according to actual detection demand, in the present embodiment, k1
And k2Difference value 0.2 and 0.5, N1 value 18, N2 values 12.
If do not broken down in the phase line, the phase hand closes or coincides with transformer, straight in excitation surge current waveform
In the case of flow component is less, the electric current in circuit is it is impossible to meet the criterion of this criterion, so acceleration distance is not opened.
But if when being broken down in the phase line, i.e., when the phase hand closes or coincides with failure, this criterion is disclosure satisfy that, so the phase
Acceleration distance open.
Differential value criterion：
WhenWhen, the quantity Z1 ＞ S1 of sampled point, and
WhenWhen, the quantity Z2 ＞ S2 of sampled point；
WhereinFor the amplitude after the phase current differential；For the maximum in the phase current differential one week after
Value, l1And l2For corresponding coefficient, it is all higher than 0 and is less than 1, and l2＞ l1, S1 is the quantity of the second low threshold, and S2 is the second wealthy family
The quantity of sill；L in above-mentioned criterion1、l2, S1 and S2 be all to be determined according to actual detection demand, in the present embodiment
In, l1And l2Difference value 0.2 and 0.5, S1 value 19, S2 values 13.
If do not broken down in the phase line, the phase hand closes or coincides with transformer, straight in excitation surge current waveform
In the case that flow component is larger, the electric current in circuit is it is impossible to meet the criterion of this criterion, so not opening adding for the phase
Fast distance.If broken down in the phase line, i.e., when the phase hand closes or coincides with failure, this criterion is disclosure satisfy that, so
The acceleration distance of the open phase.
Voltage criterion：Phase voltageThe phase and the voltage between phases between other phases
X and Y in this criterion need the voltage between phases between rated voltage and each phase according to each phase to determine, in this reality
Apply in example, X values 40, Y values 70.
If do not broken down in circuit, i.e., when hand closes or coincides with transformer, voltage change is little, close to just
Normal voltage, it is impossible to meet this criterion, the acceleration distance of the phase is not opened now., should if broken down on the circuit of the phase
The ratio that the voltage of phase declines is larger, will meet this criterion, i.e., the phase hand closes or coincided with failure, so the acceleration of the open phase
Distance.
If certain mutually meets any one in above-mentioned original value criterion, differential value criterion and voltage criterion, then the phase
Acceleration distance open.But close and overlap for hand, the logic of acceleration distance protection act is differed.
Hand, which is closed, accelerates impedance not have directionality, is whole impedance, no matter hand is together in positive failure or reverse fault, failure phase
Acceleration distance act, cut off failure.When hand is together in single-phase fault, failure phase quadrangle meet simultaneous faults mutually accelerate away from
Leave and put, acceleration distance action excision failure；When hand is together in transformer, although failure phase quadrangle is met, but is due to the phase
The criterion of above-mentioned open acceleration distance is unsatisfactory for, so acceleration distance is failure to actuate；When hand is together in phase to phase fault, failure is alternate to compare phase
Satisfactory foot, the acceleration distance of simultaneous faults phase opens criterion and met, so the acceleration distance action of the two failure phases.Hand together in
During transformer, although failure is alternate than mutually satisfactory foot, but it is due to that failure phase acceleration distance opening criterion is unsatisfactory for, so accelerating
Distance is failure to actuate.
Acceleration impedance after coincidence has directionality, and when coinciding with reverse fault, acceleration distance is failure to actuate.Coincide with single-phase
During failure, failure phase quadrangle is met, and simultaneous faults phase acceleration distance is opened, so the acceleration distance action of the phase；Coincide with
During transformer, although failure phase quadrangle is met, but is due to that failure phase acceleration distance criterion is unsatisfactory for, so acceleration distance is not
Action；When coinciding with phase to phase fault, failure is alternate to be opened than mutually satisfactory sufficient simultaneous faults phase acceleration distance, so acceleration distance is dynamic
Make.When coinciding with transformer, although failure is alternate than mutually satisfactory foot, but it is due to that failure phase acceleration distance criterion is unsatisfactory for, institute
It is failure to actuate with acceleration distance.
The excitation surge current waveform and hand for being closed or being produced when coinciding with transformer by hand close or coincided with line fault ripple
Shape is played back, and demonstrates the validity of this method, excitation surge current waveform is as shown in Figure 3；When playback hand closes or coincides with line fault
Waveform, demonstrate the reliability that the method that the present embodiment provided ensure that acceleration distance action, as shown in Figure 4.
Device embodiment：
The present embodiment provides a kind of device of anti-acceleration distance malfunction, including when hand closes or overlaps the breaker of certain phase,
Judge whether the phase meets original value criterion, differential value criterion or voltage criterion；If it is satisfied, then the acceleration distance of the phase is opened
Module；
The criterion of the primary criterion is：
WhenWhen, sampled point quantity M1 ＞ N1；And
WhenWhen, sampled point quantity M2 ＞ N2；
WhereinFor the amplitude of the phase current sampling point,Adopted for phase electricity is maximum in the first setting time
Sample value, k1And k2For corresponding coefficient, it is all higher than 0 and is less than 1, and k2＞ k1；N1 is the quantity of the first low threshold, and N2 is first high
The quantity of threshold；
The criterion of the differential value criterion is：
WhenWhen, sampled point quantity Z1 ＞ S1；And
WhenWhen, the quantity Z2 ＞ S2 of sampled point；
WhereinFor the amplitude after the phase current differential；For after the phase current differential second set when
Interior maximum, l1And l2For corresponding coefficient, it is all higher than 0 and is less than 1, and l2＞ l1, S1 is the quantity of the second low threshold, S2
For the quantity of the second high threshold；
The criterion of the voltage criterion is：
The phase voltage of the phaseAnd the phase and the voltage between phases between other phases
A kind of device for anti-acceleration distance malfunction that the present embodiment is provided, wherein each module is not hardware module, but
The anti-acceleration distance malfunction method provided in embodiment is programmed obtained software module according to the method described above, operates in electricity
In the controller of Force system acceleration protection control device, it can be stored in mobile or fixed flash memory device.
Claims (4)
1. a kind of method of anti-acceleration distance malfunction, it is characterised in that including when hand closes or overlaps the breaker of certain phase, judging
Whether the phase meets original value criterion, differential value criterion or voltage criterion；If it is satisfied, then the step that the acceleration distance of the phase is opened
Suddenly；
The criterion of the primary criterion is：
WhenWhen, sampled point quantity M1 ＞ N1；And
WhenWhen, sampled point quantity M2 ＞ N2；
WhereinFor the amplitude of the phase current sampling point,Adopted for the phase current is interior maximum in the first setting time
Sample value, k1And k2For corresponding coefficient, it is all higher than 0 and is less than 1, and k2＞ k1；N1 is the quantity of the first low threshold, and N2 is first high
The quantity of threshold；
The criterion of the differential value criterion is：
WhenWhen, sampled point quantity Z1 ＞ S1；And
WhenWhen, the quantity Z2 ＞ S2 of sampled point；
WhereinFor the amplitude after the phase current differential；For in the second setting time after the phase current differential
Maximum, l1And l2For corresponding coefficient, it is all higher than 0 and is less than 1, and l2＞ l1, S1 is the quantity of the second low threshold, and S2 is second
The quantity of high threshold；
The criterion of the voltage criterion is：
The phase voltage of the phaseAnd the phase and the voltage between phases between other phases
2. a kind of method of anti-acceleration distance malfunction according to claim 1, it is characterised in that first setting time
It is corresponding one with the second setting time and uses cycle, k1And k2Respectively 0.2 and 0.5, l1And l2Respectively 0.2 He
0.5, N1 and N2 is respectively 18 and 13, and S1 and S2 are respectively 19 and 13, and X and Y are respectively 40 and 70.
3. a kind of device of anti-acceleration distance malfunction, it is characterised in that including when hand closes or overlaps the breaker of certain phase, judging
Whether the phase meets original value criterion, differential value criterion or voltage criterion；If it is satisfied, then the mould that the acceleration distance of the phase is opened
Block；
The criterion of the primary criterion is：
WhenWhen, sampled point quantity M1 ＞ N1；And
WhenWhen, sampled point quantity M2 ＞ N2；
WhereinFor the amplitude of the phase current sampling point,For the sampling that the phase current is maximum in the first setting time
Value, k1And k2For corresponding coefficient, it is all higher than 0 and is less than 1, and k2＞ k1；N1 is the quantity of the first low threshold, and N2 is the first wealthy family
The quantity of sill；
The criterion of the differential value criterion is：
WhenWhen, sampled point quantity Z1 ＞ S1；And
WhenWhen, the quantity Z2 ＞ S2 of sampled point；
WhereinFor the amplitude after the phase current differential；For after the phase current differential in the second setting time
Maximum, l1And l2For corresponding coefficient, it is all higher than 0 and is less than 1, and l2＞ l1, S1 is the quantity of the second low threshold, and S2 is the
The quantity of two high thresholds；
The criterion of the voltage criterion is：
The phase voltage of the phaseAnd the phase and the voltage between phases between other phases
4. a kind of device of anti-acceleration distance malfunction according to claim 3, it is characterised in that first setting time
It is corresponding one with the second setting time and uses cycle, k1And k2Respectively 0.2 and 0.5, l1And l2Respectively 0.2 He
0.5, N1 and N2 is respectively 18 and 13, and S1 and S2 are respectively 19 and 13, and X and Y are respectively 40 and 70.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710271652.2A CN107276044B (en) | 2017-04-24 | 2017-04-24 | A kind of method and apparatus of anti-acceleration distance malfunction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710271652.2A CN107276044B (en) | 2017-04-24 | 2017-04-24 | A kind of method and apparatus of anti-acceleration distance malfunction |
Publications (2)
| Publication Number | Publication Date |
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| CN107276044A true CN107276044A (en) | 2017-10-20 |
| CN107276044B CN107276044B (en) | 2019-04-12 |
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ID=60073572
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012257384A (en) * | 2011-06-09 | 2012-12-27 | Chugoku Electric Power Co Inc:The | Short circuit distance relay, and system protection system using the same |
| CN103354354A (en) * | 2013-06-26 | 2013-10-16 | 国家电网公司 | Impedance protection method and apparatus suitable for micro-electrical network |
| CN103441477A (en) * | 2013-08-15 | 2013-12-11 | 攀钢集团西昌钢钒有限公司 | Setting method for distance protection device of line transformer set |
| CN105140884A (en) * | 2015-07-17 | 2015-12-09 | 许继集团有限公司 | Ultra-high voltage regulation and compensation transformer no-load anti-misoperation method |
-
2017
- 2017-04-24 CN CN201710271652.2A patent/CN107276044B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012257384A (en) * | 2011-06-09 | 2012-12-27 | Chugoku Electric Power Co Inc:The | Short circuit distance relay, and system protection system using the same |
| CN103354354A (en) * | 2013-06-26 | 2013-10-16 | 国家电网公司 | Impedance protection method and apparatus suitable for micro-electrical network |
| CN103441477A (en) * | 2013-08-15 | 2013-12-11 | 攀钢集团西昌钢钒有限公司 | Setting method for distance protection device of line transformer set |
| CN105140884A (en) * | 2015-07-17 | 2015-12-09 | 许继集团有限公司 | Ultra-high voltage regulation and compensation transformer no-load anti-misoperation method |
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| CN107276044B (en) | 2019-04-12 |
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