CN106602506B - A kind of current differential relay based on poor impedance - Google Patents
A kind of current differential relay based on poor impedance Download PDFInfo
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Abstract
The present invention relates to a kind of current differential relays based on poor impedance, by determining with poor impedance relay and improvement current differential relay；Described and poor impedance relay includes steady-state quantity and difference impedance relay Z and Sudden Changing Rate and difference impedance relay △ Z；The improvement current differential relay includes phase current differential relayPhase current differential relayZero sequence current differential protection relay D01With hybridization current differential relay Dzj。Technical scheme is established using route internal fault external fault capacitive reactance difference and poor impedance criterion; by cooperating with improved current differential protection; realize the quick excision of troubles inside the sample space, which without carrying out current compensation there is highly sensitive, rapidity to be significantly better than existing differential protection.
Description
Technical field:
The present invention relates to field of relay protection in power, be more particularly to a kind of current differential based on poor impedance after
Electric appliance.
Background technique:
Current differential protection is used widely as the main protection of transmission line of electricity in China, and transmission line of electricity capacitive effect is poor
The action performance of dynamic protection, voltage class is higher, and capacitance current is bigger, needs to compensate capacitance current.
The prior art proposes different condenser current compensation methods, but when troubles inside the sample space, capacitance current cannot achieve standard
Really compensation.The prior art proposes the current differential protection principle based on Bergeron model, but more demanding to sample rate, adopts
When sample rate is unsatisfactory for requiring, needs to carry out difference operation, influence protection precision.After the shunt reactor of route installation simultaneously, need
It to be eliminated in differential protection and flow through shunt reactor electric current, but for controllable parallel reactors, can not accurately eliminated and flow through
Shunt reactor electric current needs to install CT in shunt reactor head end, introduces line differential protection, increase cost and O&M work
It measures.
Summary of the invention:
In view of the above problems, being utilized the object of the present invention is to provide a kind of current differential relay based on poor impedance
Route internal fault external fault capacitive reactance difference is established and poor impedance criterion, by cooperating with improved current differential protection, realizes in area
The quick excision of failure.
To achieve the above object, the invention adopts the following technical scheme: a kind of current differential relay based on poor impedance
Device, including with poor impedance relay and hybridization current differential relay；Described and poor impedance relay includes steady-state quantity and difference resistance
Reactance relay Z and Sudden Changing Rate and difference impedance relay △ Z；The hybridization current differential relay includes phase current differential relayPhase current differential relayZero sequence current differential protection relay D01With hybridization current differential relay Dzj；It is described and poor
Impedance relay includes steady-state quantity and difference impedance relay Z includes steady-state quantity and difference impedance relay Z1 and steady-state quantity and poor impedance
Relay Z2；The Sudden Changing Rate and difference impedance relay △ Z include Sudden Changing Rate and difference impedance relay △ Z1 and Sudden Changing Rate and difference
Impedance relay △ Z2；The Sudden Changing Rate and difference impedance relay △ Z2 and the steady-state quantity and difference impedance relay Z1 and door are defeated
Z outt；The steady-state quantity and difference impedance relay Z1 and the Sudden Changing Rate and difference impedance relay △ Z1 and door export Z；It is described prominent
Variable and difference impedance relay △ Z1 and the steady-state quantity and difference impedance relay Z2 and door export Z0；The output ZtWith mutually electricity
Current differential relayDZ1 is exported with door；The output Z, phase current differential relayWith hybridization current differential relay
Device DzjDZ2 is exported with door；The output DZ1 and output DZ2 or door are exported and are operated by phase breaker tripping and closing；The output of described or door
NOT gate output, output Z0, zero sequence current differential protection relay D01It is exported with phase selection element S1 with door and breaker tripping and closing is selected to operate.
The phase current differential relayPhase current differential relayZero sequence current differential protection relay D01With
Hybridize current differential relay DzjAccording to differential current relayReduction plans current weight differential relay Jfh, zero
Sequence current differential relay J0With anti-big number differential relay JDIt determines；The differential current relayIncluding split-phase electricity
Current differential relayDifferential current relayWith differential current relayThe zero sequence current differential protection
Relay J0Including the zero sequence current differential protection relay J being delayed with 40ms01With the zero sequence current differential protection relay J without delay02；
The anti-big number differential relay JDIncluding anti-big number phase differential relay JD1, anti-big number phase differential relay JD2, prevent big number zero
Sequence differential relay JD01With anti-big number zero sequence differential relay JD02。
The phase current differential relayFor the differential current relayIt is mutually differential with the anti-big number
Relay JD1It is exported with door；The phase current differential relayFor the differential current relayWith anti-big number
Phase differential relay JD1It is described to be exported with door；The zero sequence current differential protection relay D01For the zero sequence electricity of band 40ms delay
Current differential relay J01With anti-big number zero sequence differential relay JD01It is exported with door；The hybridization current differential relay DzjFor institute
State reduction plans current weight differential relay JfhWith anti-big number phase differential relay JD2With door output with described without delay
Zero sequence current differential protection relay J02With anti-big number zero sequence differential relay JD02With being exported with door for door output.
The steady-state quantity and poor impedance relay are calculate by the following formula:
Impedance
In formula,Respectively route two sides steady-state quantity phase voltage and phase current；
The active region of the steady-state quantity and poor impedance relay Z1 are surrounded in impedance rectangular coordinate system R-jX by following formula
Closed area determine:
Xset=500+5ZL1Ω、-Rset=500+5ZL1Ω、-XC=250-0.1R Ω ,-XC=250+0.2R Ω and
The active region of the steady-state quantity and poor impedance relay Z2 are surrounded in impedance rectangular coordinate system R-jX by following formula
Closed area determine:
-Rset=500+5ZL1Ω、Xset=500+5ZL1Ω、-XC=250-0.1R Ω and-XC=
250+0.3RΩ；
Wherein, RsetFor resistance definite value；XsetFor inductance definite value；XCFor capacitive reactance definite value；UΣForZL1For route
Positive sequence impedance.
The operating criterion of the Sudden Changing Rate and difference impedance relay △ Z1 are as follows:
ΔIΣZset> Δ UΣ
The operating criterion of the Sudden Changing Rate and difference impedance relay △ Z2 are as follows:
ΔIΣZset3 Δ U of >Σ
Start and is latched after putting into 2 cycles after the Sudden Changing Rate and poor impedance relay；WhereinZsetTo adjust impedance.
Differential for multiterminal, stable state measures maximum and secondary big steady-state quantity voltage and mutation measurement is maximum to dash forward with secondary big
Variable voltage and；
When there is voltage transformer disconnection, broken string voltage transformer, which is not involved in, to be compared；When only remaining next voltage, will break
Voltage is substituted with 0.9/0.5 times of voltage rating.
The differential current relayOperating criterion are as follows:
Wherein, IΣFor split-phase electric current,WithThe two sides electric current of route,Imax≥Imin；
The differential current relayPut into 2 cycles, operating criterion are as follows:
The differential current relayOperating criterion are as follows:
The reduction plans current weight differential relay JfhOperating criterion are as follows:
Wherein, IΣFor the two sides electric current of reduction plans current weight and route,WithImax-1≥Imin-1, for correspondence
Electric current phasor, be corresponding electric current phasor, be route two sides forward-order current phase
Amount.The zero sequence current differential protection relay J0Operating criterion is
Wherein, I0For zero-sequence current,ForCorresponding electric current phasor,ForCorresponding electric current phasor.
The anti-big number phase differential relay JD1Operating criterion are as follows:
Anti- big number phase current
The anti-big number phase differential relay JD2Operating criterion are as follows:
Anti- big number phase current
The anti-big number zero sequence differential relay JD01Operating criterion are as follows:
Anti- big number zero-sequence current
The anti-big number zero sequence differential relay JD02Operating criterion are as follows:
Anti- big number zero-sequence current
Wherein,B, C,For through big number treated route two sides electricity
Flow phasor.
The phase selection element S1 is determined by following formula:
Wherein,For route two sides forward-order current phasor and,For route two sides
Negative-sequence current phasor andFor route two sides zero-sequence current phasor and.Compared with the nearest prior art, this hair
Bright offer technical solution has following excellent effect
1, technical solution of the present invention differential relay has high sensitivity, rapidity significantly excellent without carrying out current compensation
In existing differential protection；
2, the improved current differential protection criterion of technical solution of the present invention is not necessarily to carry out current compensation, improves braking amount,
Being provided simultaneously with prevents abnormal function several greatly；
3, for technical solution of the present invention in troubles inside the sample space, capacitance current realizes accurate compensation；
4, (outlet three-phase shortcircuit) in the case of technical solution of the present invention catastrophe failure, failure is cut off within 5ms；
5, technical solution of the present invention cuts off high resistant ability up to 800 ohm, cuts off failure much larger than existing current differential protection
Ability (600 ohm)；
6, technical solution of the present invention rapidity plays a significant role system stabilization, and sensitivity can cut off slight event
Barrier, prevents the expansion of accident range.
Detailed description of the invention
Fig. 1 is current differential protection of embodiment of the present invention action logic schematic diagram；
Fig. 2 is current differential protection of embodiment of the present invention action logic schematic diagram；
Fig. 3 is Zero sequence current differential protection of embodiment of the present invention action logic schematic diagram；
Fig. 4 is that the embodiment of the present invention hybridizes current differential protection action logic schematic diagram；
Fig. 5 is the embodiment of the present invention and poor impedance relay and current differential relay logic relation picture；
Fig. 6 is Z of the embodiment of the present inventionset1Active region schematic diagram；
Fig. 7 is Z of the embodiment of the present inventionset2Active region schematic diagram；
Fig. 8 is that steady-state quantity of the embodiment of the present invention and poor impedance relay and Sudden Changing Rate and poor impedance relay show with logical
It is intended to；
Fig. 9 is simulation model of embodiment of the present invention schematic diagram；
Figure 10 is the side M of embodiment of the present invention three-phase current sampled value schematic diagram；
Figure 11 is A of embodiment of the present invention phase steady-state quantity and poor impedance movement locus schematic diagram；
Figure 12 is variable quantity of the embodiment of the present invention and poor impedance operation curve schematic diagram；
Figure 13 is the embodiment of the present invention and poor impedance operation curve schematic diagram；
Figure 14 is the side M of embodiment of the present invention three-phase current sampled value schematic diagram.
Specific embodiment
Below with reference to embodiment, the invention will be described in further detail.
Embodiment:
The invention of this example provides a kind of current differential relay based on poor impedance, is divided into two large divisions: and poor impedance
Relay and hybridization current differential relay.
(1) and poor impedance relay
It is divided into steady-state quantity and poor impedance relay (Z) and Sudden Changing Rate and poor impedance relay (△ Z) with poor impedance relay.
1) steady-state quantity and poor impedance relay
The calculation formula of steady-state quantity and poor impedance relay are as follows:
In formula,Respectively route two sides steady-state quantity phase voltage and phase current.
Steady-state quantity and poor impedance relay 1 (Z1), active region is as shown in Figure 6.
Steady-state quantity and poor impedance relay 2 (Z2), active region is as shown in Figure 7.
2) Sudden Changing Rate and poor impedance relay
Sudden Changing Rate and poor impedance relay 1 (△ Z1), operating criterion is
ΔIΣZset> Δ UΣ
Sudden Changing Rate and poor impedance relay 2 (△ Z2), operating criterion is
ΔIΣZset3 Δ U of >Σ
2 cycles are put into after starting, are hereafter latched.
ZsetDefinite value and continuous action confirmation points be as follows:
It is differential for multiterminal, there may be multiterminal voltage.Stable state measures maximum and secondary big steady-state quantity voltage and mutation measures
Maximum and time big Sudden Changing Rate voltage and.
When there is PT broken string, broken string PT, which is not involved in, to be compared.When only remaining next voltage, by broken string voltage with 0.9/0.5 times
Voltage rating substitution.Steady-state quantitySudden Changing RateUeFor line voltage
Rated value, U are phase voltage amplitude,For phase voltage phasor value,For phase voltage Sudden Changing Rate phasor value.
Steady-state quantity and poor impedance relay and Sudden Changing Rate and poor impedance relay are with logical as shown in Figure 8.
(2) current differential relay
1) differential current relay
Differential current relayOperating criterion is
Wherein:WithThe two sides electric current of route,Imax≥Imin。
Differential current relay2 cycles are put into, operating criterion is
Differential current relayOperating criterion is
2) reduction plans current weight differential relay Jfh
Reduction plans current weight differential relay JfhOperating criterion is
Wherein: and the two sides electric current of route,WithImax-1≥Imin-1。
3) zero sequence current differential protection relay J0
Zero sequence current differential protection relay J0Operating criterion is
Zero sequence current differential protection relay is divided into two kinds, a kind of band 40ms delay J0-T, another without delay J0。
4) prevent big number differential relay JD
Anti- big number 1 (abbreviation J of phase differential relayD1), operating criterion is
Anti- big number 2 (abbreviation J of phase differential relayD2), operating criterion is
Anti- big number 1 (abbreviation J of zero sequence differential relayD01), operating criterion is
Anti- big number 2 (abbreviation J of zero sequence differential relayD02), operating criterion is
Wherein,B, C,For through big number treated route two sides electricity
Flow phasor.
Phase selection element S1:
Current differential protection action logic is picture 1-4；
(3) and poor impedance relay and current differential relay logical relation
It is as shown in Figure 5 with poor impedance relay and current differential relay logical relation:
Embodiment 1: and poor impedance relay
(1) route two sides voltage is acquiredAnd electric currentUtilize Fourier transform meter
Calculate phasor
(2) route two sides voltage jump amount is calculatedAnd jump-value of current
Phasor is calculated using Fourier transform
(3) it calculates
(4) whenAndWhen, by mutually exporting Z.
(5) whenAndWhen, export Z0。
(6) whenAndWhen, export Zt
Embodiment 2: current differential relay is improved
(1) route two sides electric current is acquiredPhasor is calculated using Fourier transform
(2) compare with enable and
(3) it calculates compared with and enablesWith
(4) big number processing is carried out, is obtainedBoth compare, it enables
(5) I is calculatedDM0、IDN0Both, compare, it enables
(6) ifMovement, and JD1Movement, output
(7) ifMovement, and JD1Movement, output
(8) if J01Movement, and JD01Movement exports D01；
(9) if Jfh、JD2、J02、JD02Movement exports Dzj；
Embodiment 3: and poor impedance relay and improve current differential relay match it is logical
(1) if output Zt, and exportBy phase tripping circuit breaker；
(2) it if exporting Z, and exportsDzj, by phase tripping circuit breaker；
(3) if output Z0、D01, S1, and (1) or (2) condition is unsatisfactory for, and breaker is jumped in choosing.
Simulating, verifying:
Simulation model as shown in figure 9,
Model parameter
Performance evaluation
(1) quick-action
Fault type: (F1) A phase metallicity failure in area；
Action situation: A phase is acted through 4.2ms.
The side M three-phase current sampled value is as shown in Figure 10,
A phase steady-state quantity and poor impedance movement locus (t=1.67ms) as shown in figure 11,
Variable quantity and poor impedance operation curve are as shown in figure 12,
It is as shown in figure 13 with poor impedance operation curve,
(2) sensitivity
Fault type: route band 8000MW load, A phase are grounded through 800 Ω transition resistances.(extra-high voltage 5000MW, high resistant
600Ω)；
Action situation: A phase is acted through 51.7ms, as shown in figure 14,
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field is although should be understood with reference to the above embodiments: still can be to a specific embodiment of the invention
It is modified or replaced equivalently, these are without departing from any modification of spirit and scope of the invention or equivalent replacement, in Shen
Within claims of the invention that please be pending.
Claims (11)
1. a kind of current differential relay based on poor impedance, it is characterised in that: including electric with poor impedance relay and improvement
Current differential relay；Described and poor impedance relay includes steady-state quantity and difference impedance relay Z and Sudden Changing Rate and poor impedance relay
Device △ Z；The improvement current differential relay includes phase current differential relayPhase current differential relayZero sequence
Current differential relay D01With hybridization current differential relay Dzj；The steady-state quantity and difference impedance relay Z include steady-state quantity with
Poor impedance relay Z1 and steady-state quantity and poor impedance relay Z2；The Sudden Changing Rate and difference impedance relay △ Z include Sudden Changing Rate
With poor impedance relay △ Z1 and Sudden Changing Rate and difference impedance relay △ Z2；The Sudden Changing Rate and difference impedance relay △ Z2 and institute
It states steady-state quantity and difference impedance relay Z1 and door exports Zt；The steady-state quantity and difference impedance relay Z1 and the Sudden Changing Rate and difference
Impedance relay △ Z1 and door export Z；The Sudden Changing Rate and difference impedance relay △ Z1 and the steady-state quantity and poor impedance relay
Device Z2 and door export Z0；The output ZtAnd phase current differential relayDZ1 is exported with door；The output Z, phase differential current
Motor type relayWith hybridization current differential relay DzjDZ2 is exported with door；The output DZ1 and output DZ2 or door are defeated
It operates out and by phase breaker tripping and closing；The NOT gate output of described or door output, output Z0, zero sequence current differential protection relay D01With phase selection member
Part S1 is exported with door and breaker tripping and closing is selected to operate.
2. a kind of current differential relay based on poor impedance as described in claim 1, it is characterised in that: the phase current
Differential relayPhase current differential relayZero sequence current differential protection relay D01With hybridization current differential relay
DzjAccording to differential current relayReduction plans current weight differential relay Jfh, zero sequence current differential protection relay J0
With anti-big number differential relay JDIt determines；The differential current relayIncluding differential current relayPoint
Phase current differential relayWith differential current relayThe zero sequence current differential protection relay J0Including band 40ms
The zero sequence current differential protection relay J of delay01With the zero sequence current differential protection relay J without delay02；It is described it is anti-count greatly it is differential after
Electric appliance JDIncluding anti-big number phase differential relay JD1, anti-big number phase differential relay JD2, anti-big number zero sequence differential relay JD01With
Anti- big number zero sequence differential relay JD02。
3. a kind of current differential relay based on poor impedance as claimed in claim 2, it is characterised in that: the phase current
Differential relayFor the differential current relayWith the anti-big number phase differential relay JD1It is exported with door；
The phase current differential relayFor the differential current relayWith anti-big number phase differential relay JD1With door
Output；The zero sequence current differential protection relay D01For the zero sequence current differential protection relay J of band 40ms delay01With anti-big number
Zero sequence differential relay JD01It is exported with door；The hybridization current differential relay DzjIt is differential for the reduction plans current weight
Relay JfhWith anti-big number phase differential relay JD2With door output and the zero sequence current differential protection relay J without delay02With
Anti- big number zero sequence differential relay JD02With being exported with door for door output.
4. a kind of current differential relay based on poor impedance as described in claim 1, it is characterised in that: the steady-state quantity
It is calculate by the following formula with poor impedance relay:
Impedance
In formula,Respectively route two sides steady-state quantity phase voltage and phase current；
The active region 1 of the steady-state quantity and poor impedance relay Z1 pass through the envelope that following formula surrounds in impedance rectangular coordinate system R-jX
Closed region determines:
Xset=500+5ZL1Ω、-Rset=500+5ZL1Ω、-Xc=250-0.1R Ω ,-Xc=250+0.2R Ω and
The active region 2 of the steady-state quantity and poor impedance relay Z2 pass through the envelope that following formula surrounds in impedance rectangular coordinate system R-jX
Closed region determines:
-Rset=500+5ZL1Ω、Xset=500+5ZL1Ω、-Xc=250-0.1R Ω and-Xc=250+
0.3RΩ；
Wherein, RsetFor resistance definite value；XsetFor inductance definite value；XcFor capacitive reactance definite value；U∑ForZL1For the resistance of route positive sequence
It is anti-.
5. a kind of current differential relay based on poor impedance as described in claim 1, it is characterised in that: the Sudden Changing Rate
With the operating criterion of poor impedance relay △ Z1 are as follows:
ΔIΣZset> Δ UΣ
The operating criterion of the Sudden Changing Rate and difference impedance relay △ Z2 are as follows:
ΔIΣZset3 Δ U of >Σ
Start and is latched after putting into 2 cycles after the Sudden Changing Rate and poor impedance relay；WhereinZsetFor adjusting
Impedance, WithFor the Sudden Changing Rate of route two sides steady-state quantity phase current；WithFor route
The Sudden Changing Rate of two sides steady-state quantity phase voltage.
6. a kind of current differential relay based on poor impedance as described in claim 1, it is characterised in that: poor for multiterminal
It is dynamic, stable state measure maximum and time big steady-state quantity voltage and, mutation measure maximum and time big Sudden Changing Rate voltage and；
When there is voltage transformer disconnection, broken string voltage transformer, which is not involved in, to be compared；When only remaining next voltage, by the voltage that breaks
It is substituted with 0.9/0.5 times of voltage rating.
7. a kind of current differential relay based on poor impedance as claimed in claim 2, it is characterised in that: the split-phase electricity
Current differential relayOperating criterion are as follows:
Wherein, I∑For split-phase electric current,WithThe two sides electric current of route,Imax≥Imin；
The differential current relayPut into 2 cycles, operating criterion are as follows:
The differential current relayOperating criterion are as follows:
8. a kind of current differential relay based on poor impedance as claimed in claim 2, it is characterised in that: described cut down is born
Lotus current weight differential relay JfhOperating criterion are as follows:
Wherein,WithThe two sides electric current of route,WithImax-1≥Imin-1,ForCorresponding electric current phasor,ForCorresponding electric current phasor,For route two sides forward-order current phasor.
9. a kind of current differential relay based on poor impedance as claimed in claim 2, it is characterised in that: the zero sequence electricity
Current differential relay J0Operating criterion is
Wherein, I0For zero-sequence current,ForCorresponding electric current phasor,ForCorresponding electric current phasor,WithFor route two sides zero-sequence current phasor.
10. a kind of current differential relay based on poor impedance as claimed in claim 2, it is characterised in that: described anti-big
Number phase differential relay JD1Operating criterion are as follows:
Anti- big number phase current
The anti-big number phase differential relay JD2Operating criterion are as follows:
Anti- big number phase current
The anti-big number zero sequence differential relay JD01Operating criterion are as follows:
Anti- big number zero-sequence current
The anti-big number zero sequence differential relay JD02Operating criterion are as follows:
Anti- big number zero-sequence current
Wherein,B, C,For through big number treated route two sides electric current phase
Amount.
11. a kind of current differential relay based on poor impedance as described in claim 1, it is characterised in that: the phase selection
Element S1 is determined by following formula:
Wherein,For route two sides forward-order current phasor and,For route two sides negative phase-sequence electricity
Flow phasor andFor route two sides zero-sequence current phasor and, Respectively route
Two sides steady-state quantity phase current,WithThe respectively two sides phase current of route.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478147A (en) * | 2009-01-15 | 2009-07-08 | 烟台东方电子信息产业股份有限公司 | Zero sequence synthetic impedance longitudinal linkage protection determination process |
| CN102082421A (en) * | 2010-12-15 | 2011-06-01 | 国网电力科学研究院 | Implementation method of break variable current differential relay based on differential impedance principle |
| CN103701107A (en) * | 2013-12-26 | 2014-04-02 | 北京四方继保自动化股份有限公司 | Adaptive differential protection method |
-
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- 2015-10-15 CN CN201510664560.1A patent/CN106602506B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478147A (en) * | 2009-01-15 | 2009-07-08 | 烟台东方电子信息产业股份有限公司 | Zero sequence synthetic impedance longitudinal linkage protection determination process |
| CN102082421A (en) * | 2010-12-15 | 2011-06-01 | 国网电力科学研究院 | Implementation method of break variable current differential relay based on differential impedance principle |
| CN103701107A (en) * | 2013-12-26 | 2014-04-02 | 北京四方继保自动化股份有限公司 | Adaptive differential protection method |
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