CN103779851B - Supertension line distance backup protection check method - Google Patents
Supertension line distance backup protection check method Download PDFInfo
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- CN103779851B CN103779851B CN201410072485.5A CN201410072485A CN103779851B CN 103779851 B CN103779851 B CN 103779851B CN 201410072485 A CN201410072485 A CN 201410072485A CN 103779851 B CN103779851 B CN 103779851B
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Abstract
The invention provides a kind of distance backup protection check method of supertension line, the method comprises the following steps: according to distance backup protection I section check method, backup protection I section of adjusting the distance carries out selectivity check; According to distance backup protection II section check method, backup protection II section of adjusting the distance is checked, and judges whether its adjacent lines has transformer, if so, then judges whether to stretch out adjacent main transformer; If not, then selectivity check is carried out; According to distance backup protection III section check method, backup protection III section of adjusting the distance is checked, and judges that operate time size is to carry out selectivity check, finally carries out load check of hiding.The present invention is under the prerequisite not reducing power grid security risk; make calculation and check convenient, quick and accurate; alleviate the workload of calculation and check; and be consistent in style with protection system calculation principle in form; be convenient to the realization of computer, possess good versatility with portable.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, particularly relate to a kind of supertension line distance backup protection check method.
Background technology
Relaying protection is one of most important secondary device in electric power system, has very crucial effect to the safety of system, stable operation.At present, relay protection constant value is all under off-line state, consider that the maximum operational mode of system and minimum operational mode obtain, and remains unchanged in system cloud gray model.But; in actual motion, system operation mode is constantly change; when system due to overhaul of the equipments, newly built construction put into operation and power grid accident and be in some special running status time; part relay protection constant value possibly cannot meet the requirement of selectivity and sensitivity, there is the possibility of false protection and tripping.Therefore; be necessary to carry out Security Checking and assessment to the relay protection constant value under current operational mode; identify and there is the operation definite value of hidden danger and the dangerous operational mode of performance of relay setting exception may be caused, thus improve the managerial skills to electric grid relay protection constant value.
At present, there is many defects in the distance backup protection check method of supertension line (220 ~ 500kV), such as, because electric network composition changes and the variation of operational mode, makes check result unreliable.
Summary of the invention
Based on this, be necessary for the insecure problem of above-mentioned check result, a kind of supertension line distance backup protection check method is provided.
For achieving the above object, the present invention adopts following technical scheme:
A distance backup protection check method for supertension line, comprises the following steps:
Obtain the operational mode of current electric grid, and carry out selectivity check according to the backup protection I section of adjusting the distance of the system data under this operational mode;
According to sensitivity K
lmexperience impedance Z maximum with the short circuit of this line end
gsmaxcalculate distance backup protection II section calculated value Z
jsII, and according to this distance backup protection II section calculated value Z
jsIIcarry out sensitivity and check judgement, if Z
jsIIbe less than (1+ δ) * Z
setII, then sensitivity meets; Otherwise sensitivity does not meet, carry out alarm prompt; In formula, Z
setIIfor distance standby II section setting value, δ gets 0.1;
If adjacent lines has transformer, then according to this circuit positive sequence impedance Z
1with adjacent transformers resistance value Z'
tcalculate distance backup protection II section calculated value Z
jsII, and according to the distance backup protection II section calculated value Z that this calculates
jsIIcarry out selectivity and check judgement, if Z
jsIIbe greater than (1-δ) * Z
setII, then do not stretch out adjacent main transformer, selectivity meets; Otherwise stretch out adjacent main transformer, selectivity does not meet, carry out alarm prompt; In formula, δ gets 0.07;
If protection adjacent elements is circuit, II section does not coordinate with neighbor distance backup protection I section, then do not check coordinating with neighbor distance backup protection I section; If distance backup protection II is section time T
setIIbe less than min (T '
dzII+ Δ T, T
maxII), then II section coordinates with adjacent pilot protection, according to this circuit positive sequence impedance Z
1with adjacent lines positive sequence impedance value Z '
1calculate distance backup protection II section calculated value Z
jsII, and according to the distance backup protection II section calculated value Z that this calculates
jsIIcarry out selectivity and check judgement, if Z
jsIIbe greater than (1-δ) * Z
setII, then selectivity meets; Otherwise selectivity does not meet, carry out alarm prompt; In formula, T '
dzIIfor the adjacent lines protection II section time; Δ T is that the time is differential, gets 0.2S; T
maxIIfor distance backup protection II section time definite value, the upper limit is 2S; δ gets 0.07;
If min (T '
dzII+ Δ T, T
maxII) be less than or equal to T
setII, then coordinate, according to this circuit positive sequence impedance Z with the distance backup protection II section of adjacent lines
1with neighbor distance backup protection II section definite value Z'
dzIIcalculate distance backup protection II calculated value Z
jsII, and according to the distance protection II section calculated value Z that this calculates
jsIIcarry out selectivity and check judgement, if Z
jsIIbe greater than (1-δ) * Z
setII, then selectivity meets; Otherwise do not meet selectivity, carry out alarm prompt, in formula, δ gets 0.07.
As can be seen from above scheme, a kind of supertension line distance backup protection check method of the present invention, first under current way, calculate corresponding distance backup protection calculated value, and then carry out sensitivity check, selectivity is checked and is judged, this method is compared to the check method based on protection range, under the prerequisite not reducing power grid security risk, not only avoid and ask for the huge amount of calculation of protection range and the problem of inaccuracy, make calculation and check convenient, quick and accurate, alleviate the workload of calculation and check, and be consistent in style with protection system calculation principle in form, be convenient to the realization of computer, possesses good versatility with portable.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of a kind of supertension line distance of the present invention backup protection check method;
Fig. 2 is ground distance backup protection II section check method schematic flow sheet in the embodiment of the present invention;
Fig. 3 is ground distance backup protection III section check method schematic flow sheet in the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Shown in Figure 1, a kind of distance backup protection check method of supertension line, comprises the following steps:
Step S101, carries out distance backup protection I section and checks, be specially and obtain the operational mode of current electric grid, and carries out selectivity check according to the backup protection I section of adjusting the distance of the system data under this operational mode.Distance backup protection I section check method is as follows:
According to the minimum experience impedance Z of protection place line end short circuit
gsminwith safety factor K
kcalculate distance backup protection I section calculated value Z
jsI, and according to this distance backup protection I section calculated value Z
jsIcarry out selectivity and check judgement, if Z
jsIbe greater than (1-δ) * Z
setI, then selectivity meets, otherwise selectivity does not meet, and carries out alarm prompt (δ gets 0.07).
Wherein, Z
setIfor ground distance I section setting value; When line length is less than 20km, safety factor K
k=0.7 (1-5/L), wherein L is line length, unit km; 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; When total track length is less than 5km, K
kget 0.
Step S102, carries out distance backup protection II section and checks.
Concrete, above-mentioned process of carrying out the check of distance backup protection II section can comprise as follows:
Step S1021, carries out sensitivity check, according to sensitivity K
lmexperience impedance Z maximum with the short circuit of this line end
gsmaxcalculate distance backup protection II section calculated value Z
jsII, and according to this distance backup protection II section calculated value Z
jsIIcarry out sensitivity and check judgement, if Z
jsIIbe less than (1+ δ) * Z
setII, then sensitivity meets; Otherwise sensitivity does not meet, carry out alarm prompt; In formula, Z
setIIfor distance standby II section setting value, δ gets 0.1;
Step S1022, if adjacent lines has transformer, then according to this circuit positive sequence impedance Z
1with adjacent transformers resistance value Z'
tcalculate distance backup protection II section calculated value Z
jsII, and according to the distance backup protection II section calculated value Z that this calculates
jsIIcarry out selectivity and check judgement, if Z
jsIIbe greater than (1-δ) * Z
setII, then do not stretch out adjacent main transformer, selectivity meets; Otherwise stretch out adjacent main transformer, selectivity does not meet, carry out alarm prompt; In formula, δ gets 0.07; If adjacent lines transless, then go to step S1023;
Step S1023, if protection adjacent elements is circuit, II section does not coordinate with neighbor distance backup protection I section, then do not need to check coordinating with neighbor distance backup protection I section; If distance backup protection II is section time T
setIIbe less than min (T '
dzII+ Δ T, T
maxII), then illustrate that II section coordinates with adjacent pilot protection, then can according to this circuit positive sequence impedance Z
1with adjacent lines positive sequence impedance value Z '
1calculate distance backup protection II section calculated value Z
jsII, and according to the distance backup protection II section calculated value Z that this calculates
jsIIcarry out selectivity and check judgement, if Z
jsIIbe greater than (1-δ) * Z
setII, then selectivity meets; Otherwise selectivity does not meet, carry out alarm prompt; In formula, T '
dzIIfor the adjacent lines protection II section time; Δ T is that the time is differential, generally gets 0.2S; T
maxIIfor distance backup protection II section time definite value, the upper limit is 2S; δ gets 0.07;
Step S1024, if min (T '
dzII+ Δ T, T
maxII) be less than or equal to T
setII, then illustrate and coordinate with the distance backup protection II section of adjacent lines, then can according to this circuit positive sequence impedance Z
1with neighbor distance backup protection II section definite value Z'
dzIIcalculate distance backup protection II calculated value Z
jsII, and according to the distance protection II section calculated value Z that this calculates
jsIIcarry out selectivity and check judgement, if Z
jsIIbe greater than (1-δ) * Z
setII, then selectivity meets; Otherwise do not meet selectivity, carry out alarm prompt, in formula, δ gets 0.07.
As a good embodiment, described according to this circuit positive sequence impedance Z
1with adjacent transformers resistance value Z'
tcalculate distance backup protection II section calculated value Z
jsIIprocess specifically can comprise as follows:
Adopt following formula to calculate distance backup protection II section calculated value Z
jsII: Z
jsII=K
k* Z
1+ K
kTk
zz'
t; In formula, K
kfor safety factor, get 0.8; K
kTfor cooperation coefficient, get 0.8; K
zfor helping increasing coefficient under current operational mode.
As a good embodiment, described according to this circuit positive sequence impedance Z
1with adjacent lines positive sequence impedance value Z '
1calculate distance backup protection II section calculated value Z
jsIIprocess specifically can comprise as follows:
Adopt following formula to calculate distance backup protection II section calculated value Z
jsII: Z
jsII=K
k* Z
1+ K
kk
zz '
1; In formula, K
kfor safety factor, get 0.7; K
zfor helping increasing coefficient under front operational mode.
As a good embodiment, described according to this circuit positive sequence impedance Z
1with neighbor distance backup protection II section definite value Z'
dzIIcalculate distance backup protection II calculated value Z
jsIIprocess specifically can comprise as follows:
Adopt following formula to calculate distance backup protection II section calculated value Z
jsII: Z
jsII=K
k* Z
1+ K
kk
zz'
dzII, in formula, K
kfor safety factor, get 0.8; K
zfor helping increasing coefficient under front operational mode.
It should be noted that the distance backup protection check method of a kind of supertension line of the present invention comprises ground distance backup protection check method and phase spacing backup protection check method.Because ground distance backup protection check method is consistent with phase spacing backup protection check method, therefore only describe the solution of the present invention in detail for ground distance backup protection check below:
As shown in Figure 2, line-to-ground distance backup protection II section sensitivity check method is:
Z
jsII＝K
lm*Z
gsmax；
Wherein: K
lmfor sensitivity; Z
gsmaxfor the maximum experience impedance of this line end short circuit.
Criterion: if Z
jsII< (1+ δ) * Z
setII, then sensitivity meets, otherwise sensitivity does not meet (δ gets 0.1), carries out alarm prompt.In formula, Z
jsIIfor ground distance II section calculated value, Z
setIIfor ground distance II section setting value.
Distance backup protection II section sensitivity K
lmrequire as follows:
A) when line length is less than 50km, K
lm=1.5;
B) when line length is between 50km and 100km, K
lm=1.45;
C) when line length is between 100km and 150km, K
lm=1.4;
D) when line length is between 150km and 200km, K
lm=1.35;
E) when line length is greater than 200km, K
lm=1.3.
(1) whether stretch out adjacent main transformer, selectivity is checked:
Z
jsII＝K
k*Z
1+K
kTK
zZ'
T
Wherein: K
kfor safety factor, get 0.8; K
kTfor cooperation coefficient, get 0.8; Z
1for this circuit positive sequence impedance; Z'
tfor adjacent transformers resistance value; K
zfor helping increasing coefficient under current operational mode.
Criterion: if Z
jsII> (1-δ) * Z
setII, then do not stretch out adjacent main transformer, selectivity meets, otherwise stretches out adjacent main transformer, and selectivity does not meet, and carries out alarm prompt.(δ gets 0.07).
(2) protect adjacent elements to be circuit, II section does not coordinate with neighbor distance backup protection I section, therefore does not need to check coordinating with neighbor distance backup protection I section.
I) min (T '
dzII+ Δ T, T
maxII) > T
setII, coordinate with adjacent pilot protection:
Z
jsII＝K
k*Z
1+K
kK
zZ′
1；
Wherein: K
kfor safety factor, get 0.7; K
zfor helping increasing coefficient under current operational mode; Z
1for this circuit positive sequence impedance; Z '
1for adjacent lines positive sequence impedance value; T '
dzIIfor the mating protection II section time; Δ T is that the time is differential, generally gets 0.2S, T
maxIIfor distance backup protection II section time definite value, the upper limit is 2S.
Criterion: if Z
jsII> (1-δ) * Z
setII, then selectivity meets, otherwise selectivity does not meet, and carries out alarm prompt.Wherein, Z
setIIfor ground distance II section setting value, δ gets 0.07.
Ii) min (T '
dzII+ Δ T, T
maxII)≤T
setII, coordinate with the distance backup protection II section of adjacent lines:
Z
jsII＝K
k*Z
1+K
kK
zZ'
dzII；
Wherein: K
kfor safety factor, get 0.8; K
zfor helping increasing coefficient under current operational mode; Z
1for this circuit positive sequence impedance; Z'
dzIIfor neighbor distance backup protection II section definite value; T '
dzIIfor the mating protection II section time; Δ T is that the time is differential, generally gets 0.2S, T
maxIIfor distance backup protection II section time definite value, the upper limit is 2S.
Criterion: if Z
jsII> (1-δ) * Z
setII, then selectivity meets, otherwise does not meet selectivity, carries out alarm prompt.(δ gets 0.07)
As shown in Figure 1, as a good embodiment, the present invention carries out after check completes, can also comprising step S103: carry out distance backup protection III section and check in backup protection II section of adjusting the distance.This process specifically can comprise as follows:
Step S1031, according to the sensitivity K of the distance backup protection III section of twice
lmexperience impedance Z maximum with the short circuit of this line end
gsmaxcalculate distance backup protection III section calculated value Z
jsIII, and according to this distance backup protection III section calculated value Z
jsIIIcarry out sensitivity and check judgement, if Z
jsIIIbe less than (1+ δ) * Z
setIII, then sensitivity meets; Otherwise sensitivity does not meet, carry out alarm prompt; In formula, Z
setIIIfor distance III section setting value; δ gets 0.1;
Step S1032, if distance backup protection III is section time T
setIIIbe less than min (T '
dzII+ Δ T, T
maxIII), then III segment protect coordinates with adjacent lines pilot protection, according to this circuit positive sequence impedance Z
1with adjacent lines positive sequence impedance definite value Z '
1calculate distance backup protection III section calculated value Z
jsIII, and according to the distance backup protection III section calculated value Z that this calculates
jsIIIcarry out selectivity and check judgement, if Z
jsIIIbe greater than (1-δ) * Z
setIII, then selectivity meets; Otherwise do not meet selectivity, carry out alarm prompt; In formula, T '
dzIIfor adjacent lines distance backup protection II section operate time; Δ T is that the time is differential, generally gets 0.2S; T
maxIIIfor the maximum actuation time of protection III section, be 4.2S; δ gets 0.07;
Step S1033, if distance backup protection III is section time T
setIIIbe less than min (T '
dzIII+ Δ T, T
maxIII) and be more than or equal to min (T '
dzII+ Δ T, T
maxIII), then III segment protect coordinates, according to this circuit positive sequence impedance Z with the distance backup protection II section of adjacent lines
1with adjacent lines distance backup protection II section action definite value Z '
iIcalculate distance backup protection III section calculated value Z
jsIII, and according to the distance backup protection III section calculated value Z that this calculates
jsIIIcarry out selectivity and check judgement, if Z
jsIIIbe greater than (1-δ) * Z
setIII, then selectivity meets; Otherwise do not meet selectivity, carry out alarm prompt, in formula, δ gets 0.07;
Step S1034, if ground distance backup protection III is section time T
setIIIbe more than or equal to min (T '
dzIII+ Δ T, T
maxIII), then III segment protect coordinates, according to this circuit positive sequence impedance Z with adjacent lines distance protection III section
1with adjacent lines distance backup protection III section action definite value Z '
iIIcalculate distance backup protection III calculated value Z
jsIII, and according to the distance backup protection III section calculated value Z that this calculates
jsIIIcarry out selectivity and check judgement, if Z
jsIIIbe greater than (1-δ) * Z
setIII, then selectivity meets; Otherwise do not meet selectivity, carry out alarm prompt; In formula, δ gets 0.07;
Step S1035, the minimum accident overload impedance Z corresponding according to this circuit maximum accident overload electric current
fhminwith safety factor K
kcalculate distance backup protection III section calculated value Z
jsIII, and according to the distance backup protection III section calculated value Z that this calculates
jsIIIcarry out load check judgement of hiding, if Z
jsIIIbe greater than (1-δ) * Z
setIII, then selectivity meets; Otherwise do not meet selectivity, carry out alarm prompt; In formula, δ gets 0.07.
As a good embodiment, described according to this circuit positive sequence impedance Z
1with adjacent lines positive sequence impedance definite value Z '
1calculate distance backup protection III section calculated value Z
jsIIIprocess comprise:
Adopt following formula to calculate distance backup protection III section calculated value Z
jsIII: Z
jsIII=K
k* Z
1+ K
kk
zz '
1; In formula, K
kfor safety factor, get 0.84; K
zfor helping increasing coefficient under current operational mode.
As a good embodiment, described according to this circuit positive sequence impedance Z
1with adjacent lines distance backup protection II section action definite value Z '
iIcalculate distance backup protection III section calculated value Z
jsIIIprocess comprise:
Adopt following formula to calculate distance backup protection III section calculated value Z
jsIII: Z
jsIII=K
k* Z
1+ K
kk
zz '
iI; In formula, K
kfor safety factor, get 0.8, K
zfor helping increasing coefficient under current operational mode.
As a good embodiment, described according to this circuit positive sequence impedance Z
1with adjacent lines distance backup protection III section action definite value Z '
iIIcalculate distance backup protection III calculated value Z
jsIII
Adopt following formula to calculate distance backup protection III section calculated value Z
jsIII: Z
jsIII=K
k* Z
1+ K
kk
zz '
iII; In formula, K
kfor safety factor, get 0.8, K
zfor helping increasing coefficient under current operational mode.
Still be described in detail for ground distance backup protection below:
As shown in Figure 3, line-to-ground distance backup protection III section sensitivity check method is:
Z
jsIII＝2K
lm*Z
gsmax；
Wherein: K
lmfor sensitivity; Z
gsmaxfor the maximum experience impedance of this line end short circuit;
Criterion: if Z
jsIII< (1+ δ) * Z
setIII, then sensitivity meets, otherwise sensitivity does not meet, and carries out alarm prompt.In formula, Z
jsIIIfor ground distance III section calculated value, Z
setIIIfor ground distance III section setting value, δ gets 0.1.
The sensitivity K of ground distance backup protection III section
lmrequire as follows:
A) when line length is less than 25km, K
lm=2.2;
B) when line length is between 25km and 50km, K
lm=2.0;
C) when line length is between 50km and 100km, K
lm=1.8;
D) when line length is between 100km and 150km, K
lm=1.6;
E) when line length is between 150km and 200km, K
lm=1.5;
F) when line length is greater than 200km, K
lm=1.4.
(1) min (T '
dzII+ Δ T, T
maxIII) > T
setIIIfirst coordinate with adjacent lines pilot protection:
Z
jsIII＝K
k*Z
1+K
kK
zZ′
1；
Wherein: K
kfor safety factor, get 0.84; K
zfor helping increasing coefficient under current operational mode; Z
1for this circuit positive sequence impedance; Z '
1for adjacent lines positive sequence impedance definite value; T '
dzIIfor adjacent lines ground distance backup protection II section operate time; Δ T is that the time is differential, generally gets 0.2S; T
maxIIIfor the maximum actuation time of ground protection III section, be 4.2S, T
setIIIfor ground distance backup protection III section setting time.
Criterion: if Z
jsIII> (1-δ) * Z
setIII, then selectivity meets, otherwise does not meet selectivity, carries out alarm prompt (δ gets 0.07).
(2) min (T '
dzIII+ Δ T, T
maxIII) > T
setIII>=min (T '
dzII+ Δ T, T
maxIII) coordinate with the distance backup protection II section of adjacent lines:
Z
jsIII＝K
k*Z
1+K
kK
zZ′
II；
Wherein: K
kfor safety factor, get 0.8; K
zfor helping increasing coefficient under current operational mode; Z
1for this circuit positive sequence impedance; Z '
iIfor adjacent lines distance backup protection II section action definite value; T '
dzIIfor adjacent lines ground distance backup protection II section operate time; T '
dzIIIfor adjacent lines ground distance backup protection III section operate time; Δ T is that the time is differential, generally gets 0.2S; T
maxIIIfor the maximum actuation time of ground protection III section, be 4.2S.
Criterion: if Z
jsIII> (1-δ) * Z
setIII, then selectivity meets, otherwise does not meet selectivity, carries out alarm prompt (δ gets 0.07).
(3) T
setII>=min (T '
dzIII+ Δ T, T
maxIII) coordinate with adjacent lines distance protection III section:
Z
jsIII＝K
k*Z
1+K
kK
zZ′
III；
Wherein: K
kfor safety factor, get 0.8; K
zfor helping increasing coefficient under current operational mode; Z
1for this circuit positive sequence impedance; Z '
iIIfor adjacent lines distance backup protection III section action definite value; T '
dzIIIfor adjacent lines distance backup protection III section operate time; Δ T is that the time is differential, generally gets 0.2S; T
maxIIIfor the maximum actuation time of distance backup protection III section, be 4.2S.
Criterion: if Z
jsIII> (1-δ) * Z
setIII, then selectivity meets, otherwise does not meet selectivity, carries out alarm prompt (δ gets 0.07).
(4) the minimum load impedance of this circuit is escaped:
Z
jsIII＝K
k*Z
fhmin；
Wherein: K
kfor safety factor, get 0.7; Z
fhminfor the minimum accident overload impedance that this circuit maximum accident overload electric current is corresponding;
Criterion: if Z
jsIII> (1-δ) * Z
setIII, then selectivity meets, otherwise does not meet selectivity, carries out alarm prompt (δ gets 0.07).
Can be found out by above scheme, a kind of supertension line distance backup protection check method of the present invention, first under current way, calculate corresponding distance backup protection calculated value, and then carry out sensitivity check, selectivity is checked and is judged, this method is compared to the check method based on protection range, under the prerequisite not reducing power grid security risk, not only avoid and ask for the huge amount of calculation of protection range and the problem of inaccuracy, make calculation and check convenient, quick and accurate, alleviate the workload of calculation and check, and be consistent in style with protection system calculation principle in form, be convenient to the realization of computer, possesses good versatility with portable.
It should be noted that, although the step in the present invention arranges with label, but and be not used in and limit the precedence of step, the order of step or the execution of certain step need based on other steps unless expressly stated, otherwise the relative rank of step is adjustable.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a distance backup protection check method for supertension line, is characterized in that, comprise the following steps:
Obtain the operational mode of current electric grid, and carry out selectivity check according to the backup protection I section of adjusting the distance of the system data under this operational mode;
According to sensitivity K
lmexperience impedance Z maximum with the short circuit of this line end
gsmaxcalculate distance backup protection II section calculated value Z
jsII, and according to this distance backup protection II section calculated value Z
jsIIcarry out sensitivity and check judgement, if Z
jsIIbe less than (1+ δ) * Z
setII, then sensitivity meets; Otherwise sensitivity does not meet, carry out alarm prompt; In formula, Z
setIIfor distance standby II section setting value, δ gets 0.1;
If adjacent lines has transformer, then according to this circuit positive sequence impedance Z
1with adjacent transformers resistance value Z '
tcalculate distance backup protection II section calculated value Z
jsII, and according to the distance backup protection II section calculated value Z that this calculates
jsIIcarry out selectivity and check judgement, if Z
jsIIbe greater than (1-δ) * Z
setII, then do not stretch out adjacent main transformer, selectivity meets; Otherwise stretch out adjacent main transformer, selectivity does not meet, carry out alarm prompt; In formula, δ gets 0.07;
If protection adjacent elements is circuit, II section does not coordinate with neighbor distance backup protection I section, then do not check coordinating with neighbor distance backup protection I section; If distance backup protection II is section time T
setIIbe less than min (T '
dzII+ Δ T, T
maxII), then II section coordinates with adjacent pilot protection, according to this circuit positive sequence impedance Z
1with adjacent lines positive sequence impedance value Z '
1calculate distance backup protection II section calculated value Z
jsII, and according to the distance backup protection II section calculated value Z that this calculates
jsIIcarry out selectivity and check judgement, if Z
jsIIbe greater than (1-δ) * Z
setII, then selectivity meets; Otherwise selectivity does not meet, carry out alarm prompt; In formula, T '
dzIIfor the adjacent lines protection II section time; Δ T is that the time is differential, gets 0.2S; T
maxIIfor distance backup protection II section time definite value, the upper limit is 2S; δ gets 0.07;
If min (T '
dzII+ Δ T, T
maxII) be less than or equal to T
setII, then coordinate, according to this circuit positive sequence impedance Z with the distance backup protection II section of adjacent lines
1with neighbor distance backup protection II section definite value Z '
dzIIcalculate distance backup protection II calculated value Z
jsII, and according to the distance protection II section calculated value Z that this calculates
jsIIcarry out selectivity and check judgement, if Z
jsIIbe greater than (1-δ) * Z
setII, then selectivity meets; Otherwise do not meet selectivity, carry out alarm prompt, in formula, δ gets 0.07.
2. the distance backup protection check method of supertension line according to claim 1, is characterized in that, the sensitivity K of described distance backup protection II section
lmrequire as follows:
When line length is less than 50km, K
lm=1.5;
When line length is between 50km and 100km, K
lm=1.45;
When line length is between 100km and 150km, K
lm=1.4;
When line length is between 150km and 200km, K
lm=1.35;
When line length is greater than 200km, K
lm=1.3.
3. the distance backup protection check method of supertension line according to claim 1, is characterized in that, described according to this circuit positive sequence impedance Z
1with adjacent transformers resistance value Z '
tcalculate distance backup protection II section calculated value Z
jsIIprocess comprise:
Adopt following formula to calculate distance backup protection II section calculated value Z
jsII: Z
jsII=K
k* Z
1+ K
kTk
zz '
t; In formula, K
kfor safety factor, get 0.8; K
kTfor cooperation coefficient, get 0.8; K
zfor helping increasing coefficient under current operational mode.
4. the distance backup protection check method of supertension line according to claim 3, is characterized in that, described according to this circuit positive sequence impedance Z
1with adjacent lines positive sequence impedance value Z '
1calculate distance backup protection II section calculated value Z
jsIIprocess comprise:
Adopt following formula to calculate distance backup protection II section calculated value Z
jsII: Z
jsII=K
k* Z
1+ K
kk
zz '
1; In formula, K
kfor safety factor, get 0.7; K
zfor helping increasing coefficient under front operational mode.
5. the distance backup protection check method of the supertension line according to claim 3 or 4, is characterized in that, described according to this circuit positive sequence impedance Z
1with neighbor distance backup protection II section definite value Z '
dzIIcalculate distance backup protection II calculated value Z
jsIIprocess comprise:
Adopt following formula to calculate distance backup protection II section calculated value Z
jsII: Z
jsII=K
k* Z
1+ K
kk
zz '
dzII, in formula, K
kfor safety factor, get 0.8; K
zfor helping increasing coefficient under front operational mode.
6. the distance backup protection check method of supertension line according to claim 1, is characterized in that, carries out after check completes, also comprising step in backup protection II section of adjusting the distance:
According to the sensitivity K of the distance backup protection III section of twice
lmexperience impedance Z maximum with the short circuit of this line end
gsmaxcalculate distance backup protection III section calculated value Z
jsIII, and according to this distance backup protection III section calculated value Z
jsIIIcarry out sensitivity and check judgement, if Z
jsIIIbe less than (1+ δ) * Z
setIII, then sensitivity meets; Otherwise sensitivity does not meet, carry out alarm prompt; In formula, Z
setIIIfor distance III section setting value; δ gets 0.1;
If distance backup protection III is section time T
setIIIbe less than min (T '
dzII+ Δ T, T
maxIII), then III segment protect coordinates with adjacent lines pilot protection, according to this circuit positive sequence impedance Z
1with adjacent lines positive sequence impedance definite value Z '
1calculate distance backup protection III section calculated value Z
jsIII, and according to the distance backup protection III section calculated value Z that this calculates
jsIIIcarry out selectivity and check judgement, if Z
jsIIIbe greater than (1-δ) * Z
setIII, then selectivity meets; Otherwise do not meet selectivity, carry out alarm prompt; In formula, T '
dzIIfor adjacent lines distance backup protection II section operate time; Δ T is that the time is differential, gets 0.2S; T
maxIIIfor the maximum actuation time of protection III section, be 4.2S; δ gets 0.07;
If distance backup protection III is section time T
setIIIbe less than min (T '
dzIII+ Δ T, T
maxIII) and be more than or equal to min (T '
dzII+ Δ T, T
maxIII), then III segment protect coordinates, according to this circuit positive sequence impedance Z with the distance backup protection II section of adjacent lines
1with adjacent lines distance backup protection II section action definite value Z '
iIcalculate distance backup protection III section calculated value Z
jsIII, and according to the distance backup protection III section calculated value Z that this calculates
jsIIIcarry out selectivity and check judgement, if Z
jsIIIbe greater than (1-δ) * Z
setIII, then selectivity meets; Otherwise do not meet selectivity, carry out alarm prompt, in formula, δ gets 0.07;
If distance backup protection III is section time T
setIIIbe more than or equal to min (T '
dzIII+ Δ T, T
maxIII), then III segment protect coordinates, according to this circuit positive sequence impedance Z with adjacent lines distance protection III section
1with adjacent lines distance backup protection III section action definite value Z '
iIIcalculate distance backup protection III calculated value Z
jsIII, and according to the distance backup protection III section calculated value Z that this calculates
jsIIIcarry out selectivity and check judgement, if Z
jsIIIbe greater than (1-δ) * Z
setIII, then selectivity meets; Otherwise do not meet selectivity, carry out alarm prompt; In formula, δ gets 0.07;
The minimum accident overload impedance Z corresponding according to this circuit maximum accident overload electric current
fhminwith safety factor K
kcalculate distance backup protection III section calculated value Z
jsIII, and according to the distance backup protection III section calculated value Z that this calculates
jsIIIcarry out load check judgement of hiding, if Z
jsIIIbe greater than (1-δ) * Z
setIII, then selectivity meets; Otherwise do not meet selectivity, carry out alarm prompt; In formula, δ gets 0.07.
7. the distance backup protection check method of supertension line according to claim 6, is characterized in that, the sensitivity K of described distance backup protection III section
lmrequire as follows:
When line length is less than 25km, K
lm=2.2;
When line length is between 25km and 50km, K
lm=2.0;
When line length is between 50km and 100km, K
lm=1.8;
When line length is between 100km and 150km, K
lm=1.6;
When line length is between 150km and 200km, K
lm=1.5;
When line length is greater than 200km, K
lm=1.4.
8. the distance backup protection check method of supertension line according to claim 6, is characterized in that, described according to this circuit positive sequence impedance Z
1with adjacent lines positive sequence impedance definite value Z '
1calculate distance backup protection III section calculated value Z
jsIIIprocess comprise:
Adopt following formula to calculate distance backup protection III section calculated value Z
jsIII: Z
jsIII=K
k* Z
1+ K
kk
zz '
1; In formula, K
kfor safety factor, get 0.84; K
zfor helping increasing coefficient under current operational mode.
9. the distance backup protection check method of supertension line according to claim 8, is characterized in that, described according to this circuit positive sequence impedance Z
1with adjacent lines distance backup protection II section action definite value Z '
iIcalculate distance backup protection III section calculated value Z
jsIIIprocess comprise:
Adopt following formula to calculate distance backup protection III section calculated value Z
jsIII: Z
jsIII=K
k* Z
1+ K
kk
zz '
iI; In formula, K
kfor safety factor, get 0.8, K
zfor helping increasing coefficient under current operational mode.
10. the distance backup protection check method of supertension line according to claim 8 or claim 9, is characterized in that, described according to this circuit positive sequence impedance Z
1with adjacent lines distance backup protection III section action definite value Z '
iIIcalculate distance backup protection III calculated value Z
jsIII
Adopt following formula to calculate distance backup protection III section calculated value Z
jsIII: Z
jsIII=K
k* Z
1+ K
kk
zz '
iII; In formula, K
kfor safety factor, get 0.8, K
zfor helping increasing coefficient under current operational mode.
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| CN105552862A (en) * | 2015-12-31 | 2016-05-04 | 国家电网公司 | Regional backup protection method for setting and simplifying distance III section protection |
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| CN104319748B (en) * | 2014-10-13 | 2017-04-12 | 清华大学 | Quick adjustment method for parallel line branching factor in substation area distance protection section III |
| CN105305390A (en) * | 2015-11-17 | 2016-02-03 | 北京中恒博瑞数字电力科技有限公司 | Setting calculation optimization method for direct feeding traction network distance protection |
| 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 |
| CN106655095A (en) * | 2016-11-01 | 2017-05-10 | 国家电网公司 | Transformer backup protection setting method |
| CN109787186B (en) * | 2017-11-15 | 2022-08-09 | 中国电力科学研究院有限公司 | Cloud platform based multi-stage power grid wide area fixed value checking method and system |
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| CN103779851A (en) | 2014-05-07 |
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Address after: 510699 No. 75 Meihua Road, Yuexiu District, Guangzhou City, Guangdong Province Patentee after: ELECTRICAL POWER DISPATCHING & CONTROL CENTER OF GUANGDONG POWER GRID Co.,Ltd. Patentee after: HUAZHONG University OF SCIENCE AND TECHNOLOGY Address before: 510699 No. 75 Meihua Road, Yuexiu District, Guangzhou City, Guangdong Province Patentee before: ELECTRIC POWER DISPATCH CONTROL CENTER OF GUANGDONG GRID Co. Patentee before: HUAZHONG University OF SCIENCE AND TECHNOLOGY |
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