CN107968384A - A kind of same bar multiloop zero-sequence protection method and device - Google Patents

A kind of same bar multiloop zero-sequence protection method and device Download PDF

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Publication number
CN107968384A
CN107968384A CN201710987276.7A CN201710987276A CN107968384A CN 107968384 A CN107968384 A CN 107968384A CN 201710987276 A CN201710987276 A CN 201710987276A CN 107968384 A CN107968384 A CN 107968384A
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China
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circuit
zero
adjacent lines
sequence
sequence current
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CN107968384B (en
Inventor
陈建民
邱智勇
姜宪国
李仲青
王兴国
姚斌
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State Grid Corp of China SGCC
East China Grid Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
East China Grid Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—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
    • H02H7/267—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 for parallel lines and wires

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  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)

Abstract

The present invention relates to a kind of same bar multiloop zero-sequence protection method and device, the described method includes：Determine the zero-sequence current of circuit and its adjacent lines；Zero-sequence mutual inductance coefficient of the adjacent lines to the circuit is obtained, and determines the penalty coefficient of adjacent lines to the zero-sequence mutual inductance coefficient of the circuit according to the adjacent lines；The zero-sequence current after line build-out is determined using the penalty coefficient of the zero-sequence current and the adjacent lines of the circuit and its adjacent lines；The line start zero-sequence current protection is acted according to the zero-sequence current after the zero-sequence current of the circuit and the line build-out; technical solution provided by the invention; the zero-sequence current of adjacent lines is introduced to the zero-sequence current protection criterion of this circuit; the malfunction of this zero sequence current protection can be effectively avoided, improves the security of zero-sequence current protection.

Description

A kind of same bar multiloop zero-sequence protection method and device
Technical field
The present invention relates to field of relay protection in power, and in particular to a kind of multi-circuit lines on the same pole zero-sequence current protection side Method and device.
Background technology
As domestic power load is continuously increased, power construction is fast-developing, and transmission of electricity corridor is increasingly in short supply, common-tower double-return, In that can share corridor, saving occupation of land resource, has been more and more widely used for three times and four loop lines route.In multi-circuit lines on the same tower In erection, due to the limitation of actual conditions, a large amount of engineerings employ the erection form that same tower does not replace, in addition also part circuit The local erection mode with tower is employed, causes each loop line road three-phase can not be full symmetric.
Parameter unbalance with each bar circuit itself of tower and the electromagnetic coupled relation between adjacent lines, can flow through Larger unbalanced component is produced in load current with tower circuit, wherein with influence of the zero sequence unbalanced component to protection the most It is prominent.Root is it is found by researches that in complicated multi-circuit lines on the same tower engineering, since line parameter circuit value is uneven and the shadow of mutual inductance effect Pilot causes zero-sequence current amplitude excessive, and zero-sequence current protection malfunction may be caused when serious.Therefore, it is necessary to study new zero sequence Current protection method, avoids influence of the adjacent lines to this circuit.
The content of the invention
The present invention provides a kind of same bar multiloop zero-sequence protection method and device, and the purpose is to effectively compensate zero sequence Electric current, reduces influence of the adjacent lines to the zero-sequence current of this circuit, avoids this zero sequence current protection because of adjacent lines Influence and malfunction, improve the security of zero-sequence current protection.
The purpose of the present invention is what is realized using following technical proposals：
A kind of same bar multiloop zero-sequence protection method, it is improved in that including：
Determine the zero-sequence current of circuit and its adjacent lines；
Zero-sequence mutual inductance coefficient of the adjacent lines to the circuit is obtained, and according to the adjacent lines to the circuit Zero-sequence mutual inductance coefficient determine the penalty coefficient of adjacent lines；
Determine that circuit is mended using the penalty coefficient of the zero-sequence current and the adjacent lines of the circuit and its adjacent lines Zero-sequence current after repaying；
Judge whether to open the circuit according to the zero-sequence current after the zero-sequence current of the circuit and the line build-out Dynamic zero-sequence current protection action.
Preferably, the zero-sequence current of the definite circuit and its adjacent lines, including：
The zero-sequence current of circuit is determined as the following formula
In above formula,For the A phase current phasors of the circuit,For the B phase current phasors of the circuit,For the line The C phase current phasors on road；
The zero-sequence current of the xth bar adjacent lines of circuit is determined as the following formula
Wherein：X ∈ [Isosorbide-5-Nitrae],For the A phase current phasors of the xth bar adjacent lines of the circuit,For the circuit Xth bar adjacent lines B phase current phasors,For the C phase current phasors of the xth bar adjacent lines of the circuit.
Preferably, zero-sequence mutual inductance coefficient of the adjacent lines to the circuit is obtained, and according to the adjacent lines pair The zero-sequence mutual inductance coefficient of the circuit determines the penalty coefficient of adjacent lines, including：
Zero-sequence mutual inductance coefficient of the adjacent lines to the circuit is determined as the following formula, including：
Wherein：KxAIt is the adjacent xth bar circuit A phase currents to the zero-sequence mutual inductance coefficient of the circuit, KxBFor the phase Adjacent xth bar circuit B phase currents are to the zero-sequence mutual inductance coefficient of the circuit, KxCIt is the adjacent xth bar circuit C phase currents to described The zero-sequence mutual inductance coefficient of circuit,For the zero-sequence current of circuit,For the A phase current phases of the xth bar adjacent lines of the circuit Amount,For the B phase current phasors of the xth bar adjacent lines of the circuit,For the C phases of the xth bar adjacent lines of the circuit Electric current phasor, x ∈ [Isosorbide-5-Nitrae]；
The penalty coefficient K of the xth bar adjacent lines of circuit is determined as the following formulax：
Kx=(KxA+KxB+KxC)/3
Preferably, the penalty coefficient of the zero-sequence current and the adjacent lines using the circuit and its adjacent lines Determine the zero-sequence current after line build-out, including：
The zero-sequence current after line build-out is determined as the following formula：
Wherein：For the zero-sequence current of the circuit, KxFor the penalty coefficient of the xth bar adjacent lines of the circuit, For the zero-sequence current of the xth bar adjacent lines of the circuit.
Preferably, the zero-sequence current according to after the zero-sequence current of the circuit and the line build-out judges whether pair The line start protection act, including：
If the zero-sequence current after the zero-sequence current of the circuit and the line build-out meets protective condition, to the line Road starting protection action, wherein, the protective condition is determined as the following formula：
b:T ＞ T0dz
Wherein：I0dzIt is zero-sequence current definite value, T0dzIt is zero sequence time definite value, t is the duration for meeting condition a.
A kind of same bar multiloop zero-sequence current protection device, it is improved in that including：
First determination unit, for determining the zero-sequence current of circuit and its adjacent lines；
Second determination unit, obtains zero-sequence mutual inductance coefficient of the adjacent lines to the circuit, and according to described adjacent Circuit determines the zero-sequence mutual inductance coefficient of the circuit penalty coefficient of adjacent lines；
3rd determination unit, for utilizing the circuit and its zero-sequence current of adjacent lines and the benefit of the adjacent lines Repay coefficient and determine the zero-sequence current after line build-out；
Protection location, judges whether for the zero-sequence current after the zero-sequence current according to the circuit and the line build-out The line start zero-sequence current protection is acted.
Preferably, first determination unit, including：
First determining module, for determining the zero-sequence current of circuit as the following formula
In above formula,For the A phase current phasors of the circuit,For the B phase current phasors of the circuit,For the line The C phase current phasors on road；
Second determining module, the zero-sequence current of the xth bar adjacent lines for determining circuit as the following formula
Wherein：X ∈ [1, X],For the A phase current phasors of the xth bar adjacent lines of the circuit,For the circuit Xth bar adjacent lines B phase current phasors,For the C phase current phasors of the xth bar adjacent lines of the circuit.
Preferably, second determination unit, including：
3rd determining module：For determining zero-sequence mutual inductance coefficient of the adjacent lines to the circuit as the following formula, including：
Wherein：KxAIt is the adjacent xth bar circuit A phase currents to the zero-sequence mutual inductance coefficient of the circuit, KxBFor the phase Adjacent xth bar circuit B phase currents are to the zero-sequence mutual inductance coefficient of the circuit, KxCIt is the adjacent xth bar circuit C phase currents to described The zero-sequence mutual inductance coefficient of circuit,For the zero-sequence current of circuit,For the A phase current phases of the xth bar adjacent lines of the circuit Amount,For the B phase current phasors of the xth bar adjacent lines of the circuit,For the C phases of the xth bar adjacent lines of the circuit Electric current phasor, x ∈ [Isosorbide-5-Nitrae]；
4th determining module, the penalty coefficient K of the xth bar adjacent lines for determining circuit as the following formulax：
Kx=(KxA+KxB+KxC)/3
Preferably, the 3rd determination unit, including：
5th determining module, for determining the zero-sequence current after line build-out as the following formula：
Wherein：For the zero-sequence current of the circuit, KxFor the penalty coefficient of the xth bar adjacent lines of the circuit, For the zero-sequence current of the xth bar adjacent lines of the circuit.
Preferably, the protection location, including：
Protection module, if meeting ceiling for the zero-sequence current after the zero-sequence current of the circuit and the line build-out Part, then to the line start protection act, wherein, the protective condition is determined as the following formula：
b:T ＞ T0dz
Wherein：I0dzIt is zero-sequence current definite value, T0dzIt is zero sequence time definite value, t is the duration for meeting condition a.
Beneficial effects of the present invention：
Technical solution provided by the invention, by determining the zero-sequence current after adjacent lines compensation, and with the zero of this circuit Sequence electric current considers, and the zero-sequence current of adjacent lines is introduced to the zero-sequence current protection of this circuit.Based on provided by the invention Technical solution, can effectively compensate zero-sequence current, reduce influence of the adjacent lines to the zero-sequence current of this circuit, can be to avoid This zero sequence current protection because adjacent lines influence and malfunction, improve the security of zero-sequence current protection.
Brief description of the drawings
Fig. 1 is the annexation figure of 5415,5416,5810 circuits of 500kV in the embodiment of the present invention；
Fig. 2 is the phasor diagram of 5415 and 5416 circuit three-phase currents and zero-sequence current in the embodiment of the present invention；
Fig. 3 is a kind of flow chart of same bar multiloop zero-sequence protection method provided by the invention；
Fig. 4 be in the embodiment of the present invention I loop lines road A with respect to the zero-sequence mutual inductance coefficient figure on II loop lines road；
Fig. 5 be in the embodiment of the present invention I loop lines road B with respect to the zero-sequence mutual inductance coefficient figure on II loop lines road；
Fig. 6 be in the embodiment of the present invention I loop lines road C with respect to the zero-sequence mutual inductance coefficient figure on II loop lines road；
Fig. 7 is a kind of structure diagram of same bar multiloop zero-sequence current protection device provided by the invention.
Embodiment
Elaborate below in conjunction with the accompanying drawings to the embodiment of the present invention.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art The all other embodiment obtained without making creative work, belongs to the scope of protection of the invention.
Current power transmission network construction is increasingly sophisticated, and the triphase parameter that complicated construction of line mode is easy to cause circuit is not right Claim, and then cause the appearance of out-of-balance current in circuit.For example, as shown in Figure 1, three loop line of same tower of certain power station submitting is because near Pull open and load increase, cause zero sequence out-of-balance current more than 300A, emergency adjustment zero sequence inverse time-lag protection definite value, causes Operation risk, zero-sequence current is resulted even under some operating conditions and reaches definite value and triggers grid power blackout accident.
The Qin is shown in Table 1 by 5415 lines and 5416 line current of Qin's fist, two sub-value.
(CT no-load voltage ratios are 2500 to 1 5415 and 5416 line current of table, two sub-value:1)
Secondary current reaches 0.11A, and a corresponding zero-sequence current 275A, definite value is acted close to 300A.
As shown in Fig. 2, it is 5415 and 5416 circuit three-phase currents and zero-sequence current phasor diagram, due to the shadow of same bar circuit Ring, cause the three-phase current asymmetry of this circuit, zero-sequence current is larger, therefore, it is necessary to study new zero-sequence current protection side Method, avoids influence of the adjacent lines to this circuit zero-sequence current.
A kind of same bar multiloop zero-sequence protection method provided by the invention, with to avoid adjacent lines to this line zero The influence of sequence current protection, as shown in figure 3, including：
101. determine the zero-sequence current of circuit and its adjacent lines；
102. zero-sequence mutual inductance coefficient of the adjacent lines to the circuit is obtained, and according to the adjacent lines to described The zero-sequence mutual inductance coefficient of circuit determines the penalty coefficient of adjacent lines；
103. determine line using the penalty coefficient of the zero-sequence current and the adjacent lines of the circuit and its adjacent lines Zero-sequence current after the compensation of road；
104. judged whether according to the zero-sequence current after the zero-sequence current of the circuit and the line build-out to the line Road starts zero-sequence current protection action.
Such as：By taking East China somewhere is with bar circuit as an example, adjacent lines is 3.
Specifically, the step 101, including：
The zero-sequence current of circuit is determined as the following formula
In above formula,For the A phase current phasors of the circuit,For the B phase current phasors of the circuit,For the line The C phase current phasors on road；
The zero-sequence current of the xth bar adjacent lines of circuit is determined as the following formula
Wherein：X ∈ [Isosorbide-5-Nitrae],For the A phase current phasors of the xth bar adjacent lines of the circuit,For the circuit Xth bar adjacent lines B phase current phasors,For the C phase current phasors of the xth bar adjacent lines of the circuit.
In the present embodiment：Obtain the three-phase current of this circuit：IA、IB、IC；Obtain the three-phase electricity of first adjacent lines Flow I1A、I1B、I1C, the three-phase current I of acquisition Article 2 adjacent lines2A、I2B、I2C, the three-phase electricity of acquisition Article 3 adjacent lines Flow I3A、I3B、I3C；And the phasor value of each electric current is calculated using Fourier methods.Then the three-phase electricity of each adjacent lines is utilized Stream phasor value determines the zero-sequence current of each adjacent lines：
Determine the zero-sequence current of this circuit：
After the zero-sequence current for determining circuit and its adjacent lines, zero sequence of the adjacent lines to the circuit need to be obtained Mutual inductance, and the penalty coefficient of adjacent lines is determined according to the adjacent lines to the zero-sequence mutual inductance coefficient of the circuit, because This, the step 102, including：
Zero-sequence mutual inductance coefficient of the adjacent lines to the circuit is determined as the following formula, including：
Wherein：KxAIt is the adjacent xth bar circuit A phase currents to the zero-sequence mutual inductance coefficient of the circuit, KxBFor the phase Adjacent xth bar circuit B phase currents are to the zero-sequence mutual inductance coefficient of the circuit, KxCIt is the adjacent xth bar circuit C phase currents to described The zero-sequence mutual inductance coefficient of circuit,For the zero-sequence current of circuit,For the A phase current phases of the xth bar adjacent lines of the circuit Amount,For the B phase current phasors of the xth bar adjacent lines of the circuit,For the C phases of the xth bar adjacent lines of the circuit Electric current phasor, x ∈ [Isosorbide-5-Nitrae]；
The penalty coefficient K of the xth bar adjacent lines of circuit is determined as the following formulax：
Kx=(KxA+KxB+KxC)/3
In embodiment provided by the invention：The penalty coefficient definite value of adjacent lines is respectively K1、K2、K3, the coefficient need through Cross EMTP analogue systems and calculate zero-sequence mutual inductance COEFFICIENT K of each bar circuit three-phase current to this circuit respectivelyA、KB、KCThen make even .I.e.：
K1=(K1A+K1B+K1C)/3
K2=(K2A+K2B+K2C)/3
K3=(K3A+K3B+K3C)/3
Wherein, zero-sequence mutual inductance coefficient of the adjacent lines A phase currents to this circuit is obtained by EMTP analogue systems：
Such as：In example shown in Fig. 1, it is assumed that 5810 disconnect, and study I 5415 influences to II loop lines 5416 of loop line, and I is returned Circuit is the adjacent lines on II loop lines road；
During the A phase isolated operations of I loop lines road, the mutual inductance zero-sequence current on measurement II loop lines road, calculates I loop lines road A and is returned with respect to II The mutual inductance of circuit, is calculated K1A=-0.147, as shown in figure 4, coefficient is II loop lines road 3I in figure0With respect to I loop lines road A The ratio of phase current, calculates mutual inductance on this basis divided by 3, similarly hereinafter.
Wherein, zero-sequence mutual inductance coefficient of the B phase currents to this circuit is obtained by EMTP analogue systems：I loop lines road B phases are independent During operation, the mutual inductance zero-sequence current on measurement II loop lines road, calculates I loop lines road B with respect to the mutual inductance on II loop lines road, is calculated K1B=-0.138, as shown in Figure 5.
Wherein, zero-sequence mutual inductance coefficient of the C phase currents to this circuit is obtained by EMTP analogue systems：I loop lines road C phases are independent During operation, the mutual inductance zero-sequence current on measurement II loop lines road, calculates I loop lines road C with respect to the mutual inductance on II loop lines road, is calculated K1C=-0.161, as shown in Figure 6.
Zero-sequence mutual inductance coefficient of the adjacent lines to the circuit is obtained, further calculates the adjacent lines to described The zero-utility theory of circuit：
K1=(K1A+K1B+K1C)/3
Zero-utility theory with reference to the adjacent lines to the circuit, determines the electricity of the zero sequence after the line build-out Stream, therefore, the step 103, including：
The zero-sequence current after line build-out is determined as the following formula：
Wherein：For the zero-sequence current of the circuit, KxFor the penalty coefficient of the xth bar adjacent lines of the circuit, For the zero-sequence current of the xth bar adjacent lines of the circuit.
In embodiment provided by the invention：Determine the zero-sequence current after compensation：It is used in combinationAndCarry out Compensate the differentiation of zero-sequence current protection.
After determining the zero-sequence current after line build-out, the judgement that zero-sequence current meets condition, therefore, the step need to be carried out Rapid 104, including：
If the zero-sequence current after the zero-sequence current of the circuit and the line build-out meets protective condition, to the line Road starting protection action, wherein, the protective condition is determined as the following formula：
b:T ＞ T0dz
Wherein：I0dzIt is zero-sequence current definite value, T0dzIt is zero sequence time definite value, t is the duration for meeting condition a.
When meeting condition a and condition b, zero-sequence current protection sends trip command.
A kind of same bar multiloop zero-sequence current protection device, as shown in fig. 7, comprises：
First determination unit, for determining the zero-sequence current of circuit and its adjacent lines；
Second determination unit, for obtaining zero-sequence mutual inductance coefficient of the adjacent lines to the circuit, and according to described Adjacent lines determines the zero-sequence mutual inductance coefficient of the circuit penalty coefficient of adjacent lines；
3rd determination unit, for utilizing the circuit and its zero-sequence current of adjacent lines and the benefit of the adjacent lines Repay coefficient and determine the zero-sequence current after line build-out；
Protection location, judges whether for the zero-sequence current after the zero-sequence current according to the circuit and the line build-out The line start zero-sequence current protection is acted.
Preferably, first determination unit, including：
First determining module, for determining the zero-sequence current of circuit as the following formula
In above formula,For the A phase current phasors of the circuit,For the B phase current phasors of the circuit,For the line The C phase current phasors on road；
Second determining module, the zero-sequence current of the xth bar adjacent lines for determining circuit as the following formula
Wherein：X ∈ [1, X],For the A phase current phasors of the xth bar adjacent lines of the circuit,For the circuit Xth bar adjacent lines B phase current phasors,For the C phase current phasors of the xth bar adjacent lines of the circuit.
Preferably, second determination unit, including：
3rd determining module：For determining zero-sequence mutual inductance coefficient of the adjacent lines to the circuit as the following formula, including：
Wherein：KxAIt is the adjacent xth bar circuit A phase currents to the zero-sequence mutual inductance coefficient of the circuit, KxBFor the phase Adjacent xth bar circuit B phase currents are to the zero-sequence mutual inductance coefficient of the circuit, KxCIt is the adjacent xth bar circuit C phase currents to described The zero-sequence mutual inductance coefficient of circuit,For the zero-sequence current of circuit,For the A phase current phases of the xth bar adjacent lines of the circuit Amount,For the B phase current phasors of the xth bar adjacent lines of the circuit,For the C phases of the xth bar adjacent lines of the circuit Electric current phasor, x ∈ [Isosorbide-5-Nitrae]；
4th determining module, the penalty coefficient K of the xth bar adjacent lines for determining circuit as the following formulax：
Kx=(KxA+KxB+KxC)/3
Wherein：KxAFor the A phase current phasors of the xth bar adjacent lines of the circuit, KxBFor the xth bar phase of the circuit The B phase current phasors on adjacent line road, KxCFor the C phase current phasors of the xth bar adjacent lines of the circuit, x ∈ [1, X], X are circuit Adjacent lines total number.
Preferably, the 3rd determination unit, including：
5th determining module, for determining the zero-sequence current after line build-out as the following formula：
Wherein：For the zero-sequence current of the circuit, KxFor the penalty coefficient of the xth bar adjacent lines of the circuit, For the zero-sequence current of the xth bar adjacent lines of the circuit.
Preferably, the protection location, including：
Protection module, if meeting ceiling for the zero-sequence current after the zero-sequence current of the circuit and the line build-out Part, then to the line start protection act, wherein, the protective condition is determined as the following formula：
b:T ＞ T0dz
Wherein：I0dzIt is zero-sequence current definite value, T0dzIt is zero sequence time definite value, t is the duration for meeting condition a.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program Product.Therefore, the application can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware Apply the form of example.Moreover, the application can use the computer for wherein including computer usable program code in one or more The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) The form of product.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram The combination of flow and/or square frame in journey and/or square frame and flowchart and/or the block diagram.These computer programs can be provided The processors of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices, which produces, to be used in fact The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or The instruction performed on other programmable devices is provided and is used for realization in one flow of flow chart or multiple flows and/or block diagram one The step of function of being specified in a square frame or multiple square frames.
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, to the greatest extent Pipe is described in detail the present invention with reference to above-described embodiment, those of ordinary skills in the art should understand that：Still Can be to the embodiment technical scheme is modified or replaced equivalently of the present invention, and without departing from any of spirit and scope of the invention Modification or equivalent substitution, it should all cover within the claims of the present invention.

Claims (10)

  1. A kind of 1. same bar multiloop zero-sequence protection method, it is characterised in that the described method includes：
    Determine the zero-sequence current of circuit and its adjacent lines；
    Obtain zero-sequence mutual inductance coefficient of the adjacent lines to the circuit, and according to the adjacent lines to the circuit zero Sequence mutual inductance determines the penalty coefficient of adjacent lines；
    After line build-out being determined using the penalty coefficient of the zero-sequence current and the adjacent lines of the circuit and its adjacent lines Zero-sequence current；
    Judged whether according to the zero-sequence current after the zero-sequence current of the circuit and the line build-out to the line start zero Sequence current protection acts.
  2. 2. the method as described in claim 1, it is characterised in that the zero-sequence current of the definite circuit and its adjacent lines, bag Include：
    The zero-sequence current of circuit is determined as the following formula
    In above formula,For the A phase current phasors of the circuit,For the B phase current phasors of the circuit,For the circuit C phase current phasors；
    The zero-sequence current of the xth bar adjacent lines of circuit is determined as the following formula
    Wherein：X ∈ [Isosorbide-5-Nitrae],For the A phase current phasors of the xth bar adjacent lines of the circuit,For the xth of the circuit The B phase current phasors of bar adjacent lines,For the C phase current phasors of the xth bar adjacent lines of the circuit.
  3. 3. the method as described in claim 1, it is characterised in that obtain zero-sequence mutual inductance system of the adjacent lines to the circuit Count, and determine the penalty coefficient of adjacent lines to the zero-sequence mutual inductance coefficient of the circuit according to the adjacent lines, including：
    Zero-sequence mutual inductance coefficient of the adjacent lines to the circuit is determined as the following formula, including：
    Wherein：KxAIt is the adjacent xth bar circuit A phase currents to the zero-sequence mutual inductance coefficient of the circuit, KxBFor the adjacent xth Bar circuit B phase currents are to the zero-sequence mutual inductance coefficient of the circuit, KxCIt is the adjacent xth bar circuit C phase currents to the circuit Zero-sequence mutual inductance coefficient,For the zero-sequence current of circuit,For the A phase current phasors of the xth bar adjacent lines of the circuit,For the B phase current phasors of the xth bar adjacent lines of the circuit,For the C phases electricity of the xth bar adjacent lines of the circuit Flow phasor, x ∈ [Isosorbide-5-Nitrae]；
    The penalty coefficient K of the xth bar adjacent lines of circuit is determined as the following formulax：
    Kx=(KxA+KxB+KxC)/3。
  4. 4. the method as described in claim 1, it is characterised in that described using the circuit and its zero-sequence current of adjacent lines The zero-sequence current after line build-out is determined with the penalty coefficient of the adjacent lines, including：
    The zero-sequence current after line build-out is determined as the following formula：
    Wherein：For the zero-sequence current of the circuit, KxFor the penalty coefficient of the xth bar adjacent lines of the circuit,To be described The zero-sequence current of the xth bar adjacent lines of circuit.
  5. 5. the method as described in claim 1, it is characterised in that described to be mended according to the zero-sequence current of the circuit and the circuit Zero-sequence current after repaying judges whether to the line start protection act, including：
    If the zero-sequence current after the zero-sequence current of the circuit and the line build-out meets protective condition, the circuit is opened Dynamic protection act, wherein, the protective condition is determined as the following formula：
    b:T ＞ T0dz
    Wherein：I0dzIt is zero-sequence current definite value, T0dzIt is zero sequence time definite value, t is the duration for meeting condition a.
  6. 6. a kind of same bar multiloop zero-sequence current protection device, it is characterised in that described device includes：
    First determination unit, for determining the zero-sequence current of circuit and its adjacent lines；
    Second determination unit, for obtaining the zero-sequence mutual inductance coefficient of the adjacent lines, and according to the zero sequence of the adjacent lines Mutual inductance determines the penalty coefficient of adjacent lines；
    3rd determination unit, for utilizing the circuit and its zero-sequence current of adjacent lines and the compensation system of the adjacent lines Zero-sequence current after the definite line build-out of number；
    Protection location, judges whether to institute for the zero-sequence current after the zero-sequence current according to the circuit and the line build-out State the action of line start zero-sequence current protection.
  7. 7. device as claimed in claim 6, it is characterised in that first determination unit, including：
    First determining module, for determining the zero-sequence current of circuit as the following formula
    In above formula,For the A phase current phasors of the circuit,For the B phase current phasors of the circuit,For the C of the circuit Phase current phasor；
    Second determining module, the zero-sequence current of the xth bar adjacent lines for determining circuit as the following formula
    Wherein：X ∈ [Isosorbide-5-Nitrae],For the A phase current phasors of the xth bar adjacent lines of the circuit,For the xth of the circuit The B phase current phasors of bar adjacent lines,For the C phase current phasors of the xth bar adjacent lines of the circuit.
  8. 8. device as claimed in claim 6, it is characterised in that second determination unit, including：
    3rd determining module：For determining zero-sequence mutual inductance coefficient of the adjacent lines to the circuit as the following formula, including：
    Wherein：KxAIt is the adjacent xth bar circuit A phase currents to the zero-sequence mutual inductance coefficient of the circuit, KxBFor the adjacent xth Bar circuit B phase currents are to the zero-sequence mutual inductance coefficient of the circuit, KxCIt is the adjacent xth bar circuit C phase currents to the circuit Zero-sequence mutual inductance coefficient,For the zero-sequence current of circuit,For the A phase current phasors of the xth bar adjacent lines of the circuit,For the B phase current phasors of the xth bar adjacent lines of the circuit,For the C phases electricity of the xth bar adjacent lines of the circuit Flow phasor, x ∈ [Isosorbide-5-Nitrae]；
    4th determining module, the penalty coefficient K of the xth bar adjacent lines for determining circuit as the following formulax：
    Kx=(KxA+KxB+KxC)/3。
  9. 9. device as claimed in claim 6, it is characterised in that the 3rd determination unit, including：
    5th determining module, for determining the zero-sequence current after line build-out as the following formula：
    Wherein：For the zero-sequence current of the circuit, KxFor the penalty coefficient of the xth bar adjacent lines of the circuit,To be described The zero-sequence current of the xth bar adjacent lines of circuit.
  10. 10. device as claimed in claim 6, it is characterised in that the protection location, including：
    Protection module, if meeting protective condition for the zero-sequence current after the zero-sequence current of the circuit and the line build-out, Then to the line start protection act, wherein, the protective condition is determined as the following formula：
    b:T ＞ T0dz
    Wherein：I0dzIt is zero-sequence current definite value, T0dzIt is zero sequence time definite value,It is zero-sequence current amplitude and compensation The minimum value of both zero-sequence current amplitudes afterwards, t are the duration for meeting condition a.
CN201710987276.7A 2017-10-20 2017-10-20 Same-pole multi-loop zero-sequence current protection method and device Active CN107968384B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109327007A (en) * 2018-08-10 2019-02-12 中国电力科学研究院有限公司 Multiple-loop line line zero-utility theory setting device and method based on station domain information

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104078947A (en) * 2014-07-04 2014-10-01 国家电网公司 Method for judging cross-line ground fault of non-homonymous phases of double-circuit line on basis of zero sequence compensation
CN105337256A (en) * 2015-11-23 2016-02-17 西安交通大学 Zero sequence voltage compensation element locking method for double-circuit same-tower line
RU2589716C1 (en) * 2015-05-22 2016-07-10 Роман Александрович Шестак Method for offset of magnetisation current rush during connection under voltage for transformer differential protection
CN105896486A (en) * 2016-03-29 2016-08-24 国网福建省电力有限公司 Composite voltage protection method for non-phase interline earth fault of double-circuit lines based on zero sequence current actual measurement of adjacent lines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104078947A (en) * 2014-07-04 2014-10-01 国家电网公司 Method for judging cross-line ground fault of non-homonymous phases of double-circuit line on basis of zero sequence compensation
RU2589716C1 (en) * 2015-05-22 2016-07-10 Роман Александрович Шестак Method for offset of magnetisation current rush during connection under voltage for transformer differential protection
CN105337256A (en) * 2015-11-23 2016-02-17 西安交通大学 Zero sequence voltage compensation element locking method for double-circuit same-tower line
CN105896486A (en) * 2016-03-29 2016-08-24 国网福建省电力有限公司 Composite voltage protection method for non-phase interline earth fault of double-circuit lines based on zero sequence current actual measurement of adjacent lines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
陈祥文: "超高压线路距离保护自整定方案的研究", 《高压电器》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109327007A (en) * 2018-08-10 2019-02-12 中国电力科学研究院有限公司 Multiple-loop line line zero-utility theory setting device and method based on station domain information

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