CN108872769A - A kind of double earthfault test method - Google Patents
A kind of double earthfault test method Download PDFInfo
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- CN108872769A CN108872769A CN201810630810.3A CN201810630810A CN108872769A CN 108872769 A CN108872769 A CN 108872769A CN 201810630810 A CN201810630810 A CN 201810630810A CN 108872769 A CN108872769 A CN 108872769A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
A kind of double earthfault test method, its short-circuit sequence net of short circuit is comprehensive zero sequence impedance Z0, comprehensive negative sequence impedance Z2, comprehensive positive sequence impedance Z1, comprehensive zero sequence impedance Z0, it connects after comprehensive negative sequence impedance Z2 is in parallel with comprehensive positive sequence impedance Z1, the both ends access system potential E, it wherein integrates in zero sequence impedance Z0 and flows through zero-sequence current I 0, negative-sequence current I 2 is flowed through in comprehensive negative sequence impedance Z2, flowed through in comprehensive positive sequence impedance Z1 forward-order current be I 1. can be with double earthfault test method that maintenance data is simulated, to reduce the short-circuit probability that two phase ground occurs for electric system.
Description
Technical field
The present invention relates to a kind of double earthfault test methods, more particularly to can accurately be simulated in advance two
Phase ground fault test method.
Background technique
Two-phase grounding fault is the higher fault type of probability of happening in electric system, since failure mechanism is short between two-phase
Between road and single-line to ground fault, but its fault characteristic value is very different with the two, often generates beginner and obscures.?
The relay protection device installed in heavy current grounding system, it has to be possible to which reflection is by the various failures (including two in protection scope
Phase ground fault), and reliably cut off with the time short as far as possible.In order to ensure that installed relay protection device can play guarantor
The effect of shield, acceptance inspeciton and running periodic inspection before putting into operation all are that must do project.But the microcomputer that scene uses
All without the fixed module for verifying double earthfault, the quantity of state for deriving double earthfault again compares relay protection tester again
Difficulty, so much field test personnel are due to being afraid of difficulty without doing this verifying, so that the integrality of test not can guarantee, simultaneously
Increase failure risk.
Summary of the invention
In order to solve the above technical problems, the present invention proposes a kind of double earthfault test method, can with maintenance data into
The double earthfault test method of row simulation, to reduce the short-circuit probability that two phase ground occurs for electric system.
In order to realize above-mentioned technical characteristic, the object of the present invention is achieved like this：A kind of double earthfault test
Method, short-circuit sequence net is comprehensive zero sequence impedance Z0, comprehensive negative sequence impedance Z2, comprehensive positive sequence impedance Z1, comprehensive zero sequence impedance Z0,
It connects after comprehensive negative sequence impedance Z2 is in parallel with comprehensive positive sequence impedance Z1, the both ends access system potential E, wherein comprehensive zero sequence impedance Z0
In flow through zero-sequence current I 0, negative-sequence current I 2 flowed through in comprehensive negative sequence impedance Z2, flows through forward-order current in comprehensive positive sequence impedance Z1
It is I 1；Zero-utility theory K,
UsuallyZ1=Z2 in static cell；
Thus Z0=(1+3K) Z1 is obtained
Assuming that being obtained by taking BC double earthfault as an example using symmetrical component method：
Non-faulting phase current：IA=IA1+IA2+IA0=0
Wherein IA1For A phase current positive-sequence component, IA2For A phase current negative sequence component, IA0For A phase current zero-sequence component.
The advanced phase current of failure is：IB=IB1+IB2+IB0=α2IA1+αIA2+IA0
Failure lags phase current：IC=IC1+IC2+IC0=α IA1+α2IA2+IA0
Wherein α is unit vectorial operator, i.e.,Above two formula passes through mutually each point of non-faulting
Measure base
Gained is converted in vectorial operator.
Corresponding each phasor definition is as follows:OH=IB, OE=IB1, MH=IB0, EM=IB2,
And △ EMG is with I2Modulus value be side length equilateral triangle, so：
And HF ⊥ EG is in point F
Obtained by phasor diagram：
Consider adjusting positive sequence impedance angle Φ 1, simulated failure is carried out using fixed current method, to obtain general fault electric current
Calculation formula：
Advanced phase current：
Lag phase current
WhereinFor double earthfault leading phase phase angle,To lag phase phase angle, φ is to calculate deflection angle.
Further, the faulted phase voltage formula is asked to be：Flow into relay element current in middle wire
Impedance is adjusted according to route phase fault：ZknIt is as follows to calculate line voltage：
Uφφ=mIφφZkn
Wherein IΦΦFor line current, UφφFor line voltage
M is respectively 0.7,0.95 and 1.05 in formula；
Corresponding phase voltageAngle is constant.
It is an advantage of the invention that using intuitive phasor analysis, operation equation formula when deriving double earthfault, for
Specific impedance value substitutes into equation, then accurate the amplitude and phase angle for calculating each electrical quantity carries out in various testers
The setting of this tittle, is applied in protection element, the action behavior protected when can quickly simulate double earthfault.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is double earthfault equivalence sequence pessimistic concurrency control.
Fig. 2 is three-phase current phasor diagram for assuming BC phase ground short circuit.
Fig. 3 is test wiring diagram.
When ground short circuit occurs for Fig. 4 tester simulation BC phase, tester electricity setting figure when corresponding to 0.95 times of adjusting impedance.
Specific embodiment
Embodiments of the present invention are described further with reference to the accompanying drawing.
A kind of double earthfault test method, short-circuit sequence net (such as Fig. 1) is comprehensive zero sequence impedance Z0, comprehensive negative phase-sequence hinders
Anti- Z2, comprehensive positive sequence impedance Z1 connect after comprehensive zero sequence impedance Z0, comprehensive negative sequence impedance Z2 are in parallel with comprehensive positive sequence impedance Z1,
The both ends access system potential E, wherein flowing through zero-sequence current I 0 in comprehensive zero sequence impedance Z0, integrating in negative sequence impedance Z2 and flow through negative phase-sequence
Flowing through forward-order current in electric current I 2, comprehensive positive sequence impedance Z1 is I 1；Zero-utility theory K,
UsuallyZ1=Z2 in static cell；
Thus Z0=(1+3K) Z1 is obtained
Assuming that BC double earthfault, is obtained (such as in Fig. 2) using symmetrical component method：
Non-faulting phase current：IA=IA1+IA2+IA0=0
Wherein IA1For A phase current positive-sequence component, IA2For A phase current negative sequence component, IA0For A phase current zero-sequence component.
The advanced phase current of failure is：IB=IB1+IB2+IB0=α2IA1+αIA2+IA0
Failure lags phase current：IC=IC1+IC2+IC0=α IA1+α2IA2+IA0
Wherein α is unit vectorial operator, i.e.,Above two formula passes through mutually each point of non-faulting
Measure base
Gained is converted in vectorial operator.
Corresponding each phasor definition is as follows:OH=IB, OE=IB1, MH=IB0, EM=IB2,
And △ EMG is with I2Modulus value be side length equilateral triangle, so：
And HF ⊥ EG is in point F
Obtained by phasor diagram：
Consider adjusting positive sequence impedance angle Φ 1, simulated failure is carried out using fixed current method, to obtain general fault electric current
Calculation formula：
Advanced phase current：
Lag phase current
WhereinFor double earthfault leading phase phase angle,To lag phase phase angle, φ is to calculate deflection angle.
In Fig. 3, line protective devices to be tested are carried out into safety measure according to site safety work regulation, having
Three road voltages, three road electric currents tester p-wire according to line protective devices wiring diagram access, open tester power supply, into
Enter tester " electric current, voltage tester " menu or " status switch " menu, according to the parameter in protective device fixed value list：It is to be measured
Ground distance impedance setting value ZKn, positive sequence impedance adjust angle Φ 1, zero-utility theory K, using fixed current method (i.e. short circuit electricity
Stream be fixed value), flow into protective device in electric current be calculated according to the following formula for：
Advanced phase current：
Lag phase current
Simulating corresponding phase fault voltage is：UKφ=m (IK+K3I0)Zkn=m (1+K) IKZkn
Wherein m is respectively 0.7,0.95 and 1.05, and it is constant to simulate corresponding phase fault level angle.
According to the above method, it is assumed that adjusting impedance Zk2=1 Ω, positive sequence impedance angleWhen zero sequence compensation K=0.48
BC phase ground fault is simulated, is calculated using derivation formula：
IB=5 ∠ -120 ° of 171.58 ° of+13.58 ° -82 °=5 ∠
IC=5 24.42 ° of ∠ of 120 ° -13.58 ° -82 °=5 of ∠
Phase voltage corresponding to adjusting impedance when seeking failure:
When m is 0.95, false voltage 5.265V protects action message；
When m is 1.05, false voltage 5.82V, protection is reliably failure to actuate；
When m is 0.7, false voltage 3.879V tests operating time of protection.
Tester is configured using electric current, voltage or status switch method, and (such as Fig. 4) as follows is arranged：
Applying electricity is kept for corresponding actions impedance actuation time add certain nargin time, impedor movement.
The above embodiments are only the preferred technical solution of the present invention, and are not construed as limitation of the invention, this hair
Bright protection scope should be with the technical solution of claim record, technical characteristic in the technical solution recorded including claim
Equivalents are protection scope.Equivalent replacement i.e. within this range is improved, also within protection scope of the present invention.
Claims (3)
1. a kind of double earthfault test method, it is characterized in that：Short-circuit sequence net is to integrate zero sequence impedance Z0, comprehensive negative sequence impedance
Z2, comprehensive positive sequence impedance Z1 connect with comprehensive positive sequence impedance Z1 after comprehensive zero sequence impedance Z0, comprehensive negative sequence impedance Z2 are in parallel, connect
Enter the both ends system potential E, wherein flowing through zero-sequence current I 0 in comprehensive zero sequence impedance Z0, integrating and flow through negative phase-sequence electricity in negative sequence impedance Z2
Flowing and flowing through forward-order current in I 2, comprehensive positive sequence impedance Z1 is I 1, zero-utility theory K；
UsuallyZ1=Z2 in static cell；
Thus Z0=(1+3K) Z1 is obtained
Assuming that being obtained by taking BC double earthfault as an example using symmetrical component method：
Non-faulting phase current：IA=IA1+IA2+IA0=0
Wherein IA1For A phase current positive-sequence component, IA2For A phase current negative sequence component, IA0For A phase current zero-sequence component.
The advanced phase current of failure is：IB=IB1+IB2+IB0=α2IA1+αIA2+IA0
Failure lags phase current：IC=IC1+IC2+IC0=α IA1+α2IA2+IA0
Wherein α is unit vectorial operator, i.e.,Above two formula passes through mutually each component base of non-faulting
Gained is converted in vectorial operator；
Corresponding each phasor definition is as follows:OH=IB, OE=IB1, MH=IB0, EM=IB2,
And △ EMG is with I2Modulus value be side length equilateral triangle, so：
And HF ⊥ EG is in point F
Obtained by phasor diagram：
Consider adjusting positive sequence impedance angle Φ 1, simulated failure is carried out using fixed current method, to obtain the calculating of general fault electric current
Formula：
Advanced phase current：
Lag phase current
WhereinFor double earthfault leading phase phase angle,To lag phase phase angle, φ is to calculate deflection angle.
2. a kind of double earthfault test method according to claim 1, it is characterized in that：Seek faulted phase voltage formula
For：
Uφ=(Iφ+K3I0)Z1, wherein UφFor failure phase phase voltage, IφFor double earthfault phase current, I0For zero-sequence current.
3. a kind of double earthfault test method according to claim 1, it is characterized in that：Seek faulted phase voltage formula
For：Stream
Enter relay element current in middle wire
Impedance is adjusted according to route phase fault：ZknIt is as follows to calculate line voltage：
Uφφ=mIφφZkn
Wherein IΦΦFor line current, UφφFor line voltage
M is respectively 0.7,0.95 and 1.05 in formula,
Corresponding phase voltageAngle is constant.
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| CN201810630810.3A CN108872769A (en) | 2018-06-19 | 2018-06-19 | A kind of double earthfault test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669093A (en) * | 2018-12-13 | 2019-04-23 | 南京正锐电力科技有限公司 | A kind of non-effectively earthed system line-to-ground fault detection method |
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| KR20040045544A (en) * | 2002-11-25 | 2004-06-02 | 명지대학교 | Method for detecting line to ground fault location using direct 3-phase parallel-circuit analysis in power networks |
| CN103226175A (en) * | 2013-03-21 | 2013-07-31 | 江苏省电力公司泰州供电公司 | Method for achieving double-ended ranging by virtue of resistance characteristics of ground resistor |
| CN106872852A (en) * | 2017-01-13 | 2017-06-20 | 济南大学 | The multiple fault type diagnostic method of power distribution network single-phase disconnection ground connection based on residual voltage |
| CN108051691A (en) * | 2017-11-30 | 2018-05-18 | 苏州汇川技术有限公司 | More secondary phase-shifting transformer short circuit detecting systems and method |
-
2018
- 2018-06-19 CN CN201810630810.3A patent/CN108872769A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040045544A (en) * | 2002-11-25 | 2004-06-02 | 명지대학교 | Method for detecting line to ground fault location using direct 3-phase parallel-circuit analysis in power networks |
| CN103226175A (en) * | 2013-03-21 | 2013-07-31 | 江苏省电力公司泰州供电公司 | Method for achieving double-ended ranging by virtue of resistance characteristics of ground resistor |
| CN106872852A (en) * | 2017-01-13 | 2017-06-20 | 济南大学 | The multiple fault type diagnostic method of power distribution network single-phase disconnection ground connection based on residual voltage |
| CN108051691A (en) * | 2017-11-30 | 2018-05-18 | 苏州汇川技术有限公司 | More secondary phase-shifting transformer short circuit detecting systems and method |
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| 杨增力等: ""输电线路接地距离保护整定计算方法"", 《电力系统自动化》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109669093A (en) * | 2018-12-13 | 2019-04-23 | 南京正锐电力科技有限公司 | A kind of non-effectively earthed system line-to-ground fault detection method |
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