CN102545174B - Distance back-up protection setting method of ultrahigh voltage circuit - Google Patents
Distance back-up protection setting method of ultrahigh voltage circuit Download PDFInfo
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Abstract
The invention discloses a distance back-up protection setting method of an ultrahigh voltage circuit. The distance back-up protection setting method of the ultrahigh voltage circuit comprises the following steps of: (1) carrying out three-section configuration on grounding distance spare protection and phase-to-phase distance protection respectively; and enabling each section of the grounding distance spare protection and the corresponding section of the phase-to-phase distance protection to use the same constant value; (2) setting the I section of the grounding distance spare protection by reliably avoiding metal faults occurring outside an area, so as to obtain a constant value of the I section of the grounding distance spare protection and a constant value of the I section of the phase-to-phase distance protection; (3) dividing the setting of the II section and the III section of distance spare protection into the setting of the II section or the III section of standard side distance spare protection and the setting of the II section or the III section of non-standard side distance spare protection according to a datum mark, so as to respectively obtain the constant value of the III section of the grounding distance spare protection and the constant value of the III section of the phase-to-phase distance spare protection. On the premise of not reducing security risk of a power grid, the adaptation capability of a spare protection constant value to an operation manner of the power grid is improved, and the working capacity of setting calculation is greatly reduced.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System field, be specifically related to a kind of distance back-up protection setting method of ultrahigh voltage circuit.
Background technology
Relaying protection is one of most important secondary device in electric power system, and the safety to system, stable operation have very crucial effect.Route protection for realizing to the automatic of faulty line and excision isolated fault fast, to ensure the normal operation of personal and device security and fault-free part after electrical network breaks down.The main protection of circuit without time delay tripping circuit breaker, is excised circuit, isolated fault in the time of fault.The backup protection of circuit is at power line main protection, malfunctioning or line-breaker is malfunctioning in the situation that, and the circuit breaker of this circuit of tripping or other circuit is realized the isolation of line fault.The backup protection of circuit is mainly divided into apart from backup protection and zero sequence backup protection.It is the important content of optimizing back-up protection setting method that the back-up protection setting method of adjusting the distance is optimized.
At present; there is many defects in the back-up protection setting method of supertension line (220～500kV), the new method that need to grow with each passing hour is to adapt to the demand of electrical network develop rapidly: the one, and the scheme of existing setting program for all strictly coordinating in definite value with on the time according to " 220～500kV grid relay protective apparatus moves the code of adjusting ".But this code was promulgated the beginning of the nineties in last century, was in China's electrical network generally weaker, in Microcomputer Protection is in the ascendant.Along with quick progress and the maturation of the development of Protection Technology, particularly microcomputer protecting device, main protection is more and more perfect, and the importance of backup protection is greatly reduced, and there is no need to carry out the complicated calculating of adjusting again.The 2nd, along with the fast development of electrical network; electric network composition, changes of operating modes are very rapid; it is very difficult that complicated setting principle makes adjusting of backup protection calculate; cooperation completely between in fact backup protection definite value; more and more be difficult to realize, problem that mismatch or sensitivity are not enough becomes the potential safety hazard of electrical network.
Therefore; existing distance back-up protection setting method is restricting the flexible adjustment of power system operating mode; mismatch between protection definite value, the frequent change of definite value has brought unpredictable potential risk to system, has also increased greatly the computing staff's that adjusts workload simultaneously.
Summary of the invention
For overcoming the above-mentioned problems in the prior art, the invention discloses a kind of distance back-up protection setting method of ultrahigh voltage circuit, do not increasing under the prerequisite of system safety hazards, improve the adaptive capacity that definite value changes electrical network, significantly alleviate the amount of calculation of adjusting.
Method of the present invention comprises the following steps:
1, determine that supertension line is apart from backup protection Overall Configuration Principle, that is:
According to ground distance backup protection and phase spacing backup protection configuration, and be syllogic configuration, ground distance backup protection adopts identical definite value with each section of phase spacing backup protection.
2, carry out adjusting apart from backup protection I section: outside district, metallicity fault occurs and adjust by reliably escaping, the time is got 0S.
3, carry out adjusting apart from backup protection II section: first determine reference side, for the side protection on circuit, if its offside is to have configured the two malfunctioning station ends of two mothers, this side protection can be used as reference side protection; Then, apart from the adjusting of backup protection II section, have sensitivity to adjust by this line end generation metallicity fault for reference side, time delay is fixedly got 0.7S; , coordinate according to optimizing the overall principle apart from the adjusting of backup protection II section for non-reference side.
4, carry out adjusting apart from backup protection III section: first adopt identical method to determine reference side with step 3, then the adjusting apart from backup protection III section for reference side, by minimum load impedance setting corresponding to maximum accident overload electric current that escapes this circuit, and ensureing that this line end generation metallicity fault has 2 times of sensitivity, time delay is fixedly got 3.0S; , coordinate according to optimizing the overall principle apart from the adjusting of backup protection III section for non-reference side.
In above-mentioned steps, the described optimization overall principle specifically refers to: preferentially coordinate step by step according to the principle time of carrying out of " definite value is unworthy of, time coordination " between same section, and the differential 0.2S that gets of time, definite value is by protecting sensitivity value; If the time after coordinating step by step, while being greater than a certain limit value, can coordinate by the matching principle of existing setting method; Being 2S apart from backup protection II section time upper limit, is 4.2S apart from backup protection III section time upper limit.
Setting method of the present invention is further comprising the steps of: if in the time carrying out non-reference side apart from the adjusting of backup protection II section, definite value can not escape adjacent transformers medium voltage side busbar fault, time definite value bring up to 1.5S or more than; If at the circuit that carries out running in the tuning process of non-reference side apart from backup protection III section ring network structure; and the matching principle according to existing setting method is unlinked the reduction time when definite value to it; be more differential than the high time of the time definite value of reference side time fixed value adjusting, after in the future meeting possible circuit Xie Kou, can realize and coordinating in time with reference side definite value guaranteeing.
The distance back-up protection setting method that the present invention proposes, topmost characteristic is that the selection of mismatch point is ingenious, its principal character is as follows:
(1) risk is known controlled.Mismatch point is set according to certain condition, is easy to grasp identification; Or ensured temporal cooperation the distance backup protection coordinating according to this scheme is except there is mismatch in reference side, and all the other definite values are all at least incomplete cooperation,, or has ensured the cooperation in definite value, and the security risk of electrical network is controlled.Therefore mismatch risk is known controlled.
(2) improve the adaptive capacity that definite value changes electrical network, greatly alleviated the amount of calculation of adjusting.Because the protection configuration of newly-built transformer station is all very perfect; meet the standard of reference side; and the time of reference side definite value is minimum; therefore definite value below at least coordinates with the definite value time of reference side in time; so only need adjust to the definite value of newly-built circuit, without coordinating definite value to modify to periphery on a large scale, ensure the stability of definite value; can greatly reduce to coordinate the workload of calculating, reduce the protection definite value adjustment because coordinating definite value adjustment to bring simultaneously.
(3) protection principle to the dependence of operational mode a little less than; the variation of power system operating mode is had to good adaptive capacity; definite value and protected device parameter have directly fixing relation, and the operational mode adjustment of complex large power grid is had to strong enabling capabilities.
(4) greatly alleviate the workload of adjusting.Matching relationship becomes simply, can not cause the work that again goes out a large amount of fixed value lists because of matching relationship; What electrical network was changed is adaptable, can need to again not adjust because of the change of operational mode.Greatly alleviate adjust computing staff's workload of a line, the operating risk of also having avoided the frequent change of definite value to cause.
Brief description of the drawings
Fig. 1 is ground distance back-up protection setting method flow chart;
Fig. 2 is ground distance backup protection II section setting method flow chart;
Fig. 3 is ground distance backup protection III section setting method flow chart;
Fig. 4 is distance back-up protection setting method overall principle schematic diagram of the present invention;
Fig. 5 is that mismatch point of the present invention is chosen the definite value adjustment schematic diagram of newly-built transformer station to line backup protection under mode.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The present embodiment, taking the supertension line of 220kV as example, describes distance back-up protection setting method of ultrahigh voltage circuit of the present invention in detail, as shown in Figure 1, is specially:
1, determine that supertension line is apart from backup protection Overall Configuration Principle
Supertension line configures according to ground distance backup protection and phase spacing backup protection apart from backup protection; and be syllogic configuration, i.e. ground distance backup protection I section, ground distance backup protection II section, ground distance backup protection III section and phase spacing backup protection I section, phase spacing backup protection II section and phase spacing backup protection III section.And each section of ground distance backup protection adopts identical definite value with corresponding each section of phase spacing backup protection.Therefore,, as long as determined the setting value of each section of ground distance backup protection, the definite value that phase spacing backup protection is corresponding each section is also determined with regard to corresponding, can be completed the distance backup protection of supertension line.
2, carry out adjusting of ground distance backup protection I section, determine the definite value of ground distance backup protection I section and phase spacing backup protection I section.
Outside district, there is metallicity fault and adjust by reliably escaping, definite value Z
dzIand time T
dzIbe respectively:
Z
dzI≤K
kZ
gsh，T
dzI＝0s
Wherein: K
k---safety factor;
Z
gsh---the minimum experience impedance of protection place circuit.
When line length is less than 20km, safety factor K
k=0.7 (1-5/L), wherein L is line length, the km of unit; When line length is more than or equal to 20km, generally, safety factor gets 0.7, and in particular cases (as many times mutual inductance circuits) safety factor gets 0.5; In the time that total track length is less than 5km, out of service apart from backup protection I section, the backup protection I section that do not need to adjust the distance adjust (now should guarantee the sensitivity apart from backup protection II section).
Reliably escape and metallicity fault setting method occurs outside district belong to the technology extensively adopting at present, have ripe definite formula and working specification at People's Republic of China's power industry standard " operation of 220kV～750kV grid relay protective apparatus adjust code " in (DL/T559-2007).
Phase spacing backup protection I section definite value is identical with ground distance backup protection I section definite value.
3, carry out adjusting of ground distance backup protection II section, determine the definite value of ground distance backup protection II section and phase spacing backup protection II section.
First determine reference side; for certain side protection on circuit; if its offside is to have configured the two malfunctioning station ends of two mothers; this protection can be used as the reference side of cooperation; thus by be divided into apart from adjusting of backup protection II section reference side apart from backup protection II section adjust and non-reference side apart from the two parts of adjusting of backup protection II section, be specially:
A. reference side adjusting apart from backup protection II section
Reference side has sensitivity to adjust apart from backup protection II section definite value by this line end generation metallicity fault, and time delay is fixedly got 0.7S, definite value Z
dzIIand time T
dzIIbe respectively:
Z
dzII≥K
lmZ′
gsh，T
dzII＝0.7s
Wherein: K
lm---sensitivity;
Z '
gsh---the maximum experience impedance of this circuit.
Metallicity fault has sensitivity to adjust to belong to the setting method extensively adopting at present, also has ripe definite formula and working specification in code.
B. non-reference side adjusting apart from backup protection II section
Non-reference side is according to the principle of " definite value is unworthy of, time coordination ", and definite value is adjusted by protecting sensitivity calculations result, and the time adjusts according to differential matching principle of time step by step, the differential 0.2S that gets of time.
Time after coordinating is step by step greater than (on apart from backup protection II section time definite value, being limited to 2S) in limited time; there is sensitivity by the line end generation metallic short circuit fault that breaks even and with the protection of adjacent main transformer differential or longitudinal differential protection system coordinates, also hide the principle of side transformer opposite side busbar fault is adjusted as far as possible, concrete grammar is as follows:
(1) if protection adjacent elements is transformer, coordinate with adjacent main transformer differential protection, adjust by other bus bar side busbar grounding faults of adjacent transformers of hiding, obtain definite value Z
dzIIand time T
dzIIbe respectively:
Z
dzII≤K
KZ
1+K
KK
ZZ′
T，T
dzII＝T
min
Wherein: K
k---safety factor, get 0.8;
K
kT---cooperation coefficient, get 0.8;
Z1---this circuit positive sequence impedance;
Z
t'---adjacent transformers resistance value;
K
z---consider that circuit overhauls in turn, plant stand mode changes, and gets positive sequence and helps increasing coefficient or zero sequence to help the smaller who increases in coefficient;
T
min---the minimum movements time.
Stretch out other side bus of transformer as definite value, provide alarm prompt, time T
dzIIget 1.5S or more than.
(2) if protection adjacent elements is circuit, II section does not coordinate with neighbor distance backup protection I section, starts to coordinate from pilot protection, and coordinate operate time with failure protection, specifically adjust into:
I) coordinate with adjacent pilot protection:
Z
dzII≤K
KZ
1+K
KK
ZZ′
1，T
dzII＝T
min
Wherein: K
k---safety factor, get 0.7;
K
z---consider that circuit overhauls in turn, plant stand mode changes, and gets positive sequence and helps increasing coefficient or zero sequence to help the smaller who increases in coefficient;
Z
1---this circuit positive sequence impedance;
Z '
1---adjacent lines positive sequence impedance value;
T
min---the minimum movements time, get 0.7S
Ii) sensitivity of verification protection, if sensitivity does not meet the demands, and does not stretch out adjacent transformers, coordinates with the distance backup protection II section of adjacent lines:
Z
dzII≤K
KZ
1+K
KKZ
Z′
II，T
dzII＝min(T′
dzII+ΔT，T
max)
Wherein: K
k---safety factor, get 0.8;
K
z---consider that circuit overhauls in turn, plant stand mode changes, and gets positive zero sequence and helps the smaller who increases coefficient;
Z
1---this circuit positive sequence impedance;
Z '
iI---neighbor distance backup protection II section definite value;
T '
dzII---adjacent lines II section operate time;
T
max---the longest operate time of distance protection II section;
Δ T---the time is differential, desirable 0.2S and more than
The definite value of adjusting is the smaller in (i, ii), and the time is the greater in (i, ii).
Phase spacing backup protection II section definite value is identical with ground distance backup protection II section definite value.
4, carry out, apart from the adjusting of backup protection III section, determining the definite value of ground distance backup protection I section and phase spacing backup protection I section.
Adopt identical method to determine reference side with step 3, by be divided into apart from adjusting of backup protection III section reference side apart from backup protection III section adjust and non-reference side apart from the two parts of adjusting of backup protection III section, be specially:
A. reference side is apart from backup protection III section setting principle
Reference side by minimum load impedance setting corresponding to maximum accident overload electric current that escapes this circuit, and ensures that this line end generation metallicity fault has 2 times of sensitivity to adjust apart from III section, and time delay is fixedly got 3.0S, definite value Z
dzIIIwith time Z
dzIIIbe respectively:
Z
dzIII≤K
KZ
fh，Z
dzIII≥2K
lmZ
gsh，T
dzIII＝3s
Wherein: K
lm---sensitivity;
Z '
gsh---the maximum experience impedance of this circuit;
Z
1---this circuit positive sequence impedance;
K
k---safety factor, get 0.7;
Z
fh---minimum accident overload impedance corresponding to the maximum accident overload electric current of this circuit (can input, as there is no input by the multiple estimation of CT no-load voltage ratio),
I
fhmax---the maximum accident overload electric current of this circuit
Minimum load impedance setting method corresponding to maximum accident overload electric current that escapes this circuit belongs to the conventional setting method of this area, has ripe computing formula and working specification in code.
B. non-reference side backup protection is adjusted apart from III section
Non-reference side is according to the principle of " definite value is unworthy of; time coordination ", be that definite value is by escaping minimum load impedance corresponding to the maximum accident overload electric current of this line, and ensure that this line end generation metallicity fault has specified sensitivity to adjust, time adjusts according to differential matching principle of time step by step, the differential 0.2S that gets of time.
Time after coordinating is step by step greater than (on apart from backup protection III section time definite value, being limited to 4.2S) in limited time, adjusts by existing method, and concrete grammar is as follows:
(1) first coordinate with adjacent lines pilot protection:
Z
dzIII≤K
KZ
1+K
KK
ZZ′
1，T
dzIII＝T
min
Wherein: K
k---safety factor, get 0.84;
K
z---positive sequence helps increasing coefficient and zero sequence to help the smaller who increases coefficient;
Z
1---this circuit positive sequence impedance;
Z '
1---adjacent lines positive sequence impedance definite value;
T
min---the minimum movements time of ground protection III section, get 3S.
(2) sensitivity of verification protection, if sensitivity does not meet the demands, coordinates with the distance backup protection II section of adjacent lines.
Z
dzIII≤K
KZ
1+K
KK
ZZ′
II，T
dzIII＝min(T′
dzII+ΔT，T
max)
Wherein: K
k---safety factor, get 0.8;
K
z---positive sequence helps increasing coefficient and zero sequence to help the smaller who increases coefficient;
Z
1---this circuit positive sequence impedance;
Z '
iI---adjacent lines is apart from backup protection II section action definite value;
T '
dzII---adjacent lines ground distance backup protection II section operate time;
Δ T---the time is differential;
T
max---the maximum actuation time of ground protection III section.
(3) sensitivity of verification protection, if sensitivity does not meet the demands, coordinates with adjacent lines distance protection III section:
Z
dzIII≤K
KZ
1+K
KK
ZZ′
III，T
dzIII＝min(T′
dzIII+ΔT，T
max)
Wherein: K
k---safety factor, get 0.8;
K
z---positive sequence helps increasing coefficient and zero sequence to help the smaller who increases coefficient;
Z
1---this circuit positive sequence impedance;
Z '
iII---adjacent lines is apart from backup protection III section action definite value;
T '
dzIII---adjacent lines is apart from backup protection III section operate time;
Δ T---the time is differential;
T
max---apart from the maximum actuation time of backup protection III section.
(4) by minimum load impedance setting corresponding to maximum accident overload electric current that reliably escapes this circuit
Z
dzIII≤K
KZ
fh
Wherein: K
k---safety factor, get 0.7;
Z
fh---minimum accident overload impedance corresponding to the maximum accident overload electric current of this circuit (can input, as there is no input by the multiple estimation of CT no-load voltage ratio),
I
fhmax---the maximum accident overload electric current of this circuit.
(5) result coordinating with the pilot protection of adjacent lines or apart from backup protection II section or apart from backup protection III section in step (1)～(3) and the result of step (4) compare; get smaller value wherein as this circuit apart from backup protection III section definite value; its sensitivity of verification; if sensitivity does not still meet the demands; no longer coordinate calculating; artificial adjustment definite value, and provide alarm prompt (comprise mismatch situation and whether stretch out another electric pressure bus of offside etc.).In the time that looped network is adjusted, for adopting the unlink situation of reduction time definite value of mentioned above principle, time fixed value adjusting is more differential than the high time of the time definite value of reference side, can realize and coordinating at least in time guaranteeing after in the future meeting possible circuit Xie Kou with reference side definite value.
Wherein, the experience impedance of mentioning in step 2, step 3.a and step 4.a, its computing formula is: Z
gsh=U
Φ/ (I
Φ+ 3KI
0), K=(Z in formula
0-Z
1)/3Z
1, Z
0, Z
1be respectively circuit zero sequence impedance and positive sequence impedance.
Phase spacing backup protection III section definite value is identical with ground distance backup protection III section definite value.
Distance backup protection II section sensitivity in step 3 requires as follows:
A) when line length is less than 50km, sensitivity >=1.5
B) when line length is between 50km and 100km, sensitivity >=1.45
C) when line length is between 100km and 150km, sensitivity >=1.4
D) when line length is between 150km and 200km, sensitivity >=1.35
E), when line length is greater than 200km, sensitivity is greater than 1.3
Distance backup protection III section sensitivity in step 4 requires as follows:
A) when line length is less than 25km, sensitivity >=2.2
B) when line length is between 25km and 50km, sensitivity >=2.0
C) when line length is between 50km and 100km, sensitivity >=1.8
D) when line length is between 100km and 150km, sensitivity >=1.6
E) when line length is between 150km and 200km, sensitivity >=1.5
F), when line length is greater than 200km, sensitivity is greater than 1.4
The present embodiment is the explanation of carrying out as example taking the supertension line of 220kV, wherein, the parameters such as safety factor, sensitivity, fixing definite value and time, sensitivity in the circuit of other electric pressure or other electrical network time, can be carried out choose reasonable or adjustment according to code regulation and concrete electrical network situation.
For; the definite value adjustment of newly-built transformer station to line backup protection; because the protection configuration of newly-built transformer station is all very perfect; meet the standard of reference side; and the time of reference side definite value is minimum; therefore definite value below at least coordinates with the definite value time of reference side in time, so only need adjust to the definite value of newly-built circuit, without coordinating definite value to modify to periphery on a large scale.Newly-built transformer station to the definite value adjustment of line backup protection as shown in Figure 5.
For; when the whole network reaches standard configuration, backup protection is adjusted; in the time that future, the whole network protection configuration was all standard configuration; the whole network all meets the condition as mismatch point everywhere; therefore the backup protection definite value of the whole network all can be adjusted according to reference side definite value; and without adjusting according to strict cooperation completely, i.e. the each segment limit definite value of distance protection requires to adjust according to protecting sensitivity, same section time definite value the whole network is unified.Although now backup protection definite value may can not coordinate completely at protection range with on the time, can take in the time breaking down or main protection reliability reduce time take corresponding measure to ensure the selectivity between backup protection.
It should be noted that risk and the precautionary measures of utilizing back-up protection setting method of the present invention should be noted that:
(1) current transition method exists risk and solution
For distance protection; the definite value scope of the mismatch point on long line may be stretched out adjacent lines; therefore protect beyond the adjacent lines definite value scope to divide and the malfunctioning and failure protection of single-phase switch occurs when malfunctioning again with inside; this mismatch point protection, because time definite value is lower than adjacent lines guard time definite value, is therefore likely bypassed the immediate leadership and is first moved.On the one hand malfunctioning probability is just very low again for the malfunctioning and failure protection of single-phase switch; and it is just lower by chance to occur in probability in long line stretches out adjacent lines scope situation as mismatch point range; this kind of risk reduces the malfunctioning risk of failure protection by the maintenance of strengthening main protection on the other hand, can avoid in addition arranging mismatch point in actual adjusting on long line.
(2) back-up protection setting method risk and solution when the whole network reaches standard configuration
All may there is mismatch in the whole network definite value, therefore in the time breaking down, apart from the backup protection action of may bypassing the immediate leadership.But in the situation that main protection configuration is very perfect, extremely low apart from the probability of backup protection action on the one hand; On the other hand in the time breaking down; utilize the time definite value of the backup protection of the information exchange shortening relevant peripheral protection between protection; guarantee like this in the situation that fault is not excised; go to excise isolated fault by the distance backup protection in minimum zone; guarantee selectivity, prevent due between backup protection due to the accident of overstep tripping on a large scale that does not have secure fit to cause.
As shown in Figure 4, be 220kV components of system as directed circuit and station end, K1～K4 represents respectively four line switchings, also represents the protection of relevant position with it, now according to the method for the invention, four protections is carried out adjusting apart from backup protection.It should be noted that, example is the network configuration of extremely simplifying, and only stresses method and thought of the present invention with it, does not represent the scope of application of the present invention.Example is focused on the time coordination method in narration tuning process, and the narration of definite value is omitted.
1, clearly configure apart from backup protection according to ground distance backup protection and phase spacing apart from backup protection, and be syllogic configuration;
2, the backup protection I section of adjusting the distance is adjusted: outside district, metallicity fault occurring and adjust by reliably escaping, suppose four protections at K1～K4 place, is Z1 apart from backup protection I section definite value, and the time is 0;
3, the backup protection II section of adjusting the distance is adjusted:
First, determine reference side, for certain side protection on circuit, if its offside is to have configured the two malfunctioning station ends of two mothers, this protection can be used as the reference side of cooperation, supposes that B1, B4 have configured the two malfunctioning websites of two mothers, and the protection that install at K1, K4 place can be used as reference side;
Secondly, reference side is adjusted apart from backup protection II section, definite value has specified sensitivity to adjust by this line end generation metallic earthing fault, and time delay is fixedly got 0.7S.The distance backup protection II section definite value of supposing reference side K1 and K4 place is Z2, and the time is T2;
Again; non-reference side is adjusted apart from backup protection II section; the protection that K2 place is installed; preferentially coordinate step by step according to the principle of " definite value is unworthy of, time coordination " between same section apart from backup protection II section, definite value has specified sensitivity to adjust as Z2 by this line end generation metallic earthing fault; time coordinates apart from backup protection II section with K1 place; time, differential Δ t got 0.2S, and its time setting is T2+ Δ t, and the II section of this section of circuit is adjusted and completed.Continue next stage line switching K3 place circuit adjusting apart from backup protection II section; it coordinates with the protection II section at K2 place; the time after its cooperation of supposing is greater than apart from II section delay upper bound 2S; now its definite value and time coordinate according to the pilot protection of protecting with K2 place; definite value is Z2 '; the differential 0.7S that gets of time, i.e. the definite value of K3 place protection II section is Z2 ', time setting is 0.7S.
4, the backup protection III section of adjusting the distance is adjusted
First, determine reference side, according to determining with method identical in step 3;
Secondly, reference side is adjusted apart from backup protection III section, by minimum load impedance setting corresponding to maximum accident overload electric current that escapes this circuit, and ensure that this line end generation metallicity fault has specified sensitivity to adjust, the definite value of supposing the distance backup protection III section at reference side K1 and K4 place is Z3, and the time is T3;
Again; non-reference side is adjusted apart from backup protection III section; the protection that K2 place is installed; III section definite value is by the minimum load impedance setting that escapes this line busy hour, and ensures that this line end generation metallicity fault has specified sensitivity to adjust, and definite value is Z3; time coordinates with the III section of K1 place protection; time, differential Δ t got 0.2S, and its time setting is T3+ Δ t, and the III section of this section of circuit is adjusted and completed.Continue next stage circuit adjusting apart from backup protection III section; the distance backup protection III section at K3 place coordinates with the distance backup protection III section at K2 place; the time after its cooperation of supposing is greater than time definite value upper limit 4.2S; coordinate by existing matching principle; be that its definite value and time are according to coordinating with the distance backup protection II section at K2 place; definite value is Z3 ', and the differential 0.2S that gets of time, is T2+2 Δ t.
The available Fig. 2 of the above-mentioned result of adjusting represents:
B1, B4 have configured the two malfunctioning websites of two mothers, and K1, K4 place protection definite value and time are benchmark definite value; K2 place protection definite value for according to the time step by step matching principle calculate; The definite value of K3 place protection is for to coordinate and to calculate according to existing principle.
Claims (9)
1. a distance back-up protection setting method for supertension line, comprises that ground distance backup protection is adjusted and phase spacing backup protection is adjusted, and detailed process is as follows:
(1) ground distance backup protection and phase spacing backup protection are carried out respectively to syllogic configuration;
(2) outside district, there is metallicity fault ground distance backup protection I section is adjusted by reliably escaping, obtain ground distance backup protection I section definite value, and the definite value of definite phase spacing backup protection I section is identical with ground distance backup protection I section definite value;
(3) ground distance backup protection II section is adjusted, obtain ground distance backup protection II section definite value, and the definite value of definite phase spacing backup protection II section is identical with ground distance backup protection II section definite value;
(4) ground distance backup protection III section is adjusted, obtain ground distance backup protection III section definite value, and the definite value of definite phase spacing backup protection III section is identical with ground distance backup protection III section definite value;
The detailed process of in described step (3), ground distance backup protection II section being adjusted is:
According to reference side, ground distance backup protection II section is divided into reference side ground distance backup protection II section and non-reference side ground distance backup protection II section, wherein, reference side ground distance backup protection II section definite value has the sensitivity acquisition of adjusting by this line end generation metallicity fault; Impedance definite value in non-reference side ground distance backup protection II section definite value is by protecting the acquisition of adjusting of sensitivity calculations result, time definite value utilize the time differential coordinate step by step definite;
Wherein, described reference side refers to: for the side protection on circuit, if its offside is to have configured the two malfunctioning station ends of two mothers, this side protection is the reference side of cooperation.
2. the distance back-up protection setting method of supertension line according to claim 1, is characterized in that, the described time is differential is 0.2S.
3. the distance back-up protection setting method of supertension line according to claim 1, is characterized in that, is greater than on first in limited time when the time after described differential cooperation, adjusts as follows:
(3.1) if the adjacent elements of protection is transformer, coordinate with adjacent main transformer differential protection, adjust by other bus bar side busbar grounding faults of adjacent transformers of hiding, obtain impedance definite value Z
dzIIwith time definite value T
dzIIbe respectively:
Z
dzII≤K
KZ
l+K
KK
ZZ'
T,T
dzII＝T
min
Wherein: K
kfor safety factor, Z
1for this circuit positive sequence impedance, Z
t' be adjacent transformers resistance value, K
zfor helping increasing coefficient and zero sequence, positive sequence helps the smaller who increases coefficient, T
minfor the minimum movements time;
(3.2), if protection adjacent elements is circuit, ground distance backup protection II section does not coordinate with adjacent ground distance backup protection I section, but starts to coordinate impedance definite value Z from pilot protection
dzIIwith time definite value T
dzIIbe specially:
Z
dzII≤K
KZ
l+K
KK
ZZ'
1，T
dzII＝T
min
Wherein, Z'
1for adjacent lines positive sequence impedance value.
4. the distance back-up protection setting method of supertension line according to claim 3, it is characterized in that, in described step (3.2), if when the sensitivity of protection does not meet the demands and does not stretch out adjacent transformers, coordinate with the ground distance backup protection II section of adjacent lines, and using the reckling of the impedance definite value in the definite value and the step (3.2) that obtain as ground distance backup protection II section practical impedance definite value, time definite value using the maximum of the time in the time and the step (3.2) that obtain as ground distance backup protection II section reality, wherein, the described impedance definite value and the time definite value that obtain of coordinating with the ground distance backup protection II section of adjacent lines is specially:
Z
dzII≤K
KZ
l+K
KK
ZZ'
II，T
dzII＝min(T'
dzII+ΔT,T
max)
Wherein, Z'
iIfor neighbor distance backup protection II section impedance definite value, T'
dzIIfor adjacent lines II section operate time, T
maxfor the longest operate time of distance protection II section, Δ T is that the time is differential.
5. according to the distance back-up protection setting method of the supertension line one of claim 1-4 Suo Shu, it is characterized in that, the detailed process of in described step (4), ground distance backup protection III section being adjusted is:
According to reference side, to be divided into reference side ground distance backup protection III section and non-reference side ground distance backup protection III section apart from backup protection III section, wherein, reference side ground distance backup protection III section definite value is by minimum load impedance setting corresponding to maximum accident overload electric current that escapes this circuit; Impedance definite value in non-reference side ground distance backup protection III section definite value is by the minimum load impedance escaping under this line peak load, and ensureing that this line end generation metallicity fault has the specified sensitivity acquisition of adjusting, the time definite value in definite value is according to the differential fiting tuning step by step that carries out of time;
Wherein, described reference side refers to: for the side protection on circuit, if its offside is to have configured the two malfunctioning station ends of two mothers, this side protection is the reference side of cooperation.
6. the distance back-up protection setting method of supertension line according to claim 5; it is characterized in that; time after coordinating is step by step greater than on second prescribes a time limit; following steps are adjusted; and the smaller value of getting the impedance definite value that the impedance definite value that obtains according to step (4.1)～(4.3) and step (4.4) obtain as this line-to-ground apart from backup protection III section impedance definite value, corresponding time definite value is as its time definite value:
(4.1) first coordinate with adjacent lines pilot protection, obtain respectively impedance definite value and time definite value:
Z
dzIII≤K
KZ
l+K
KK
ZZ'
l，T
dzIII＝T
min
Wherein: K
kfor safety factor, K
zhelp for positive sequence helps increasing coefficient and zero sequence the smaller who increases coefficient, Z1 is this circuit positive sequence impedance, Z'
lfor adjacent lines positive sequence impedance definite value, T
minfor the minimum movements time of ground protection III section;
(4.2) sensitivity of verification protection, if sensitivity does not meet the demands, coordinates with the distance backup protection II section of adjacent lines:
Z
dzIII≤K
KZ
l+K
KK
ZZ'
II，T
dzIII＝min(T'
dzII+ΔT,T
max)
Wherein: Z'
iIfor adjacent lines ground distance backup protection II section action definite value, T'
dzIIfor adjacent lines ground distance backup protection II section operate time, Δ T is that the time is differential, T
maxfor the maximum actuation time of ground distance backup protection III section;
(4.3) sensitivity of verification protection, if sensitivity does not meet the demands, coordinates with adjacent lines distance protection III section, obtains respectively impedance definite value and time definite value:
Z
dzIII≤K
KZ
l+K
KK
ZZ'
III,T
dzIII＝min(T'
dzIII+ΔT,T
max)
Wherein: Z'
iIIfor adjacent lines ground distance backup protection III section action definite value, T'
dzIIIfor adjacent lines ground distance backup protection III section operate time;
(4.4) by minimum load impedance setting corresponding to maximum accident overload electric current that reliably escapes this circuit, obtain impedance definite value and time definite value
Z
dzIII≤K
KZ
fh
Wherein: Z
fhfor minimum accident overload impedance corresponding to the maximum accident overload electric current of this circuit.
7. according to the distance back-up protection setting method of the supertension line one of claim 1-4 Suo Shu, it is characterized in that, described outside district, occur during metallicity fault adjusts by reliably escaping, impedance definite value Z
dzIwith time definite value T
dzIbe respectively:
Z
dzI≤K
kZ
gsh，T
dzI＝0s
Wherein K
kfor safety factor; Z
gshfor the minimum experience impedance of protection place circuit.
8. the distance back-up protection setting method of supertension line according to claim 7, is characterized in that, when line length is less than 20km, and safety factor K
k=0.7 (1-5L), wherein L is line length, the km of unit; When line length is more than or equal to 20km, safety factor gets 0.7 or 0.5.
9. according to the distance back-up protection setting method of the supertension line one of claim 1-4 Suo Shu, it is characterized in that, described line end generation metallicity fault has during sensitivity adjusts, and time delay is fixedly got 0.7S, impedance definite value Z
dzIIwith time definite value T
dzIIbe respectively:
Z
dzII≥K
lmZ'
gsh，T
dzII＝0.7s
Wherein: K
lmfor sensitivity; Z'
gshfor the maximum experience impedance of this circuit.
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| CN103280779B (en) * | 2013-04-19 | 2015-04-15 | 广东电网公司电力调度控制中心 | Auditing processing method for relay protection setting value |
| CN103514363B (en) * | 2013-07-18 | 2016-12-28 | 浙江大学 | A kind of electric power networks back-up protection on-line tuning method based on increment factor |
| CN103441477B (en) * | 2013-08-15 | 2016-08-10 | 攀钢集团西昌钢钒有限公司 | Setting method for the distance protection equipment of line change group |
| CN103595022B (en) * | 2013-12-03 | 2017-11-28 | 国家电网公司 | The relay protection and control method of 500kV electric substations 35kV house transformer current-limiting reactors |
| CN103779851B (en) * | 2014-02-28 | 2015-11-18 | 广东电网公司电力调度控制中心 | Supertension line distance backup protection check method |
| CN105140895B (en) * | 2015-08-19 | 2018-02-27 | 山东大学 | Based on region Longitudinal comparison principle apart from back-up protection method |
| CN105262064B (en) * | 2015-10-29 | 2018-02-09 | 浙江大学 | A kind of station domain back-up protection method that can be used for simplifying transformer in-situ back-up protection |
| CN105552862B (en) * | 2015-12-31 | 2017-11-17 | 国家电网公司 | The region-type back-up protection method simplified for III of Distance section protection seting |
| CN106124896B (en) * | 2016-06-28 | 2018-12-28 | 广东电网有限责任公司佛山供电局 | Simulation supervoltage line protective device phase spacing back-up protection test method manually |
| CN108110739B (en) * | 2017-12-27 | 2019-07-26 | 广东电网有限责任公司惠州供电局 | A kind of distribution network line protection definite value check algorithm |
| CN110165642B (en) * | 2019-06-26 | 2021-12-21 | 广东电网有限责任公司 | Wide area protection method, device and equipment for dealing with direct current voltage loss of adjacent transformer substations |
| CN110492449B (en) | 2019-07-16 | 2022-04-15 | 中国电力科学研究院有限公司 | Time-limit-variable distance protection timing method and device based on same-tower multi-circuit line |
| CN111668815B (en) * | 2020-04-29 | 2022-09-20 | 中国电力科学研究院有限公司 | Method and system for determining distance protection fixed value of alternating current power system |
| CN111952942B (en) * | 2020-08-12 | 2022-10-04 | 广东电网有限责任公司广州供电局 | Line backup protection setting method and device, computer equipment and storage medium |
| CN112924807A (en) * | 2021-01-13 | 2021-06-08 | 中国电力科学研究院有限公司 | Setting method and system for distance protection action time constant value |
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