CN105656086B - Overload processing method - Google Patents
Overload processing method Download PDFInfo
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- CN105656086B CN105656086B CN201510845467.0A CN201510845467A CN105656086B CN 105656086 B CN105656086 B CN 105656086B CN 201510845467 A CN201510845467 A CN 201510845467A CN 105656086 B CN105656086 B CN 105656086B
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- 238000003672 processing method Methods 0.000 title claims abstract description 47
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- 238000004364 calculation method Methods 0.000 claims description 42
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Abstract
The present invention relates to a kind of overload processing method, this method includes:Determine overload circuit;Foundation need to examine or check busbar domain;Foundation need to examine or check transformer domain;Foundation need to swell power unit domain;It will need to swell the generating set in power unit domain and be divided into the generating set group of different adjustment sensitivity level;Meet S in overload quantity1+S2+…+Si+…+SK≤ΔL≤S1+S2+…+Si+…+SK+SK+1When, judge K+1 to adjust sensitivity level highest generating set group output overflow when, whether overload quantity is reduced to 0;When overload quantity is reduced to 0, overflow adjusts the output of generating set group of the sensitivity level more than k successively, calculates the minimum required number of the generating set group for the output overflow for making overload quantity be reduced to 0;Generate the first prompt message.The minimum load amount of rising of the generating set group for needing overflow and the K+j generating set group for adjusting sensitivity level is back to dispatcher by the present invention.Dispatcher eliminates overload quantity to relevant genset operation, eliminates the danger that apparatus overload is brought.
Description
Technical field
The present invention relates to a kind of overload processing methods.
Background technology
After electrical equipment fault trips in power grid, it is possible to lead to line related or transformer overload.When circuit and change
Depressor needs dispatcher to adjust the related plant stand method of operation in time when overloading, eliminate overload, otherwise can lead to equipment damage, expands
Major break down influences.
Dispatcher is generally rule of thumb scheduled overload current at present, this sample loading mode needs dispatcher to have very
Abundant working experience could carry out rationally, accurately dispatching.It is therefore desirable to provide a kind of the auxiliary of quick processing equipment overload
Decision-making technique is helped, provides abundant accurate warning information or prompt message for accident treatment, general dispatcher can basis
Information is scheduled, and harm caused by overload is reduced or eliminated or influences, to promote the Ability of emergency management to electric network fault.
Invention content
The technical problem to be solved by the present invention is to the prompt for quickly eliminating overload conditions how is provided in accident treatment
Information.
In order to solve the above technical problems, the present invention proposes overload processing method, overload processing method provided by the invention
Including including circuit overload processing method, the circuit overload processing method includes:
S1, overload circuit is determined;
S2, each busbar for being flowed into the electric current in the overload circuit along 220KV network topology circuits are as need
Busbar is examined or check, foundation need to examine or check busbar domain;
S3, by the direct-connected transformer of examination busbar is needed described in each and in the form of line change group outlet opposite end transformer
As that need to examine or check transformer, foundation need to examine or check transformer domain;
S4, foundation need to swell power unit domain, and the process of establishing that need to swell power unit domain includes:
In all generating sets that need to examine or check busbar connection, judges each generating set and connect the power generation
Whether all connection topological paths between the need examination busbar of unit do not include the overload circuit,
If so, the generating set, which is included in, described need to swell power unit domain;
Otherwise, judged in the generating set output overflow using Load flow calculation module, the overload quantity of the overload circuit
Whether reduce;If the overload quantity reduces, which, which is included in, described need to swell power unit domain;
S5, the generating set that need to be swelled in power unit domain is divided into different grades of power generation according to sensitivity is adjusted
Machine group;
Wherein, the sensitivity that adjusts of each generating set examines or check mother by the need of the generating set and the direct-connected overload circuit
Electrical distance between line determines;
S6, meet S in the overload quantity Δ L of the overload circuit1+S2+…+Si+…+SK≤ΔL≤S1+S2+…+Si+…+
SK+SK+1When, judge that K+1 contributes overflow to the highest generating set group of sensitivity level is adjusted using Load flow calculation module
When, whether the overload quantity Δ L is reduced to 0, SiThe upper reserve level for the generating set group for adjusting sensitivity level for i-th;
S7, when judging that the overload quantity Δ L is reduced to 0, using Load flow calculation module according to adjust sensitivity level from
The output of generating set group of the sensitivity level more than k is adjusted down to high sequence successively overflow, calculating makes the overload quantity Δ L
It is reduced to the minimum required number j of the generating set group of 0 output overflow;
S8, the generating set group output that sensitivity level is adjusted in K+1 to K+j-1 is calculated using Load flow calculation module
In the case of overflow, the minimum load of the generating set group of K+j adjustings sensitivity level rises when overload quantity Δ L being made to be reduced to 0
Amount, K+j are less than or equal to the peak for adjusting sensitivity level;
S9, the first prompt message is generated, first prompt message includes:1st to K+j-1 adjusts sensitivity level
Generating set group output overflow and K+j adjust sensitivity level generating set group the minimum load amount of rising.
Optionally, the circuit overload processing method further includes:
Meet Δ L >=S in the overload quantity Δ L1+S2+…+SmWhen, generate the second prompt message, the second prompt letter
Breath includes:The equal overflow of all generating sets output that need to be swelled in power unit domain;
Wherein, m is the peak for adjusting sensitivity level.
Optionally, the circuit overload processing method further includes:
If being risen to the highest generating set group of sensitivity level is adjusted in K+1 using Load flow calculation module judgement
The overload quantity Δ L is not reduced to 0 when full, then generates third prompt message, the third prompt message includes:It is described to swell
The equal overflow of all generating sets output in power unit domain.
Optionally, the calculating process of the minimum load amount of rising includes:
In the case where K+1 to K+j-1 adjusts the generating set group output overflow of sensitivity level, according to default step
The long output for increasing K+j and adjusting the generating set group of sensitivity level;
When increasing the n default step-lengths, the overload quantity Δ L is not reduced to 0, and increases the n+1 default step-lengths
Shi Suoshu overload quantity Δs L is reduced to 0, then the minimum load amount of rising is the product of the default step-length and n+1.
Optionally, meet S in the overload quantity Δ L1+S2+…+Si+…+SK≤ΔL≤S1+S2+…+Si+…+SK+SK+1
In the case of, risen to the highest generating set group of sensitivity level is adjusted in K+1 using Load flow calculation module judgement
The overload quantity Δ L is not reduced to 0 or meets Δ L >=S in the overload quantity Δ L when full1+S2+…+SmIn the case of, it is described
Circuit overload processing method further includes:
Busbar domain (B need to be examined or check for described1,B2…Bi…Bn) in any one need to examine or check busbar BiAffiliated power transformation
It stands, executes following steps:
When further including the 220kV busbares A that need to be examined or check except busbar domain in the substation1, busbar A1With need to examine or check busbar
BiBetween be non-Electromagnetic coupling mode, and when first switch is in hot stand-by duty, judged using the Load flow calculation module
Whether the overload quantity of the overload circuit is reduced or eliminated when being closed the first switch and disconnecting second switch,
When the overload quantity is reduced or eliminated, the 4th prompt message is generated, the 4th prompt message includes:It is closed institute
First switch is stated, and disconnects the second switch;
Wherein, the first switch is busbar A1With need to examine or check busbar BiBetween bus connection switch or block switch, described
Two switches are that direction of tide is to flow into that busbar B need to be examined or checkiConnection line on line switching, and the connection line with another
Busbar connection need to be examined or check.
Optionally, meet S in the overload quantity Δ L1+S2+…+Si+…+SK≤ΔL≤S1+S2+…+Si+…+SK+SK+1
In the case of, risen to the highest generating set group of sensitivity level is adjusted in K+1 using Load flow calculation module judgement
The overload quantity Δ L is not reduced to 0 or meets Δ L >=S in the overload quantity Δ L when full1+S2+…+SmIn the case of, it is described
Circuit overload processing method further includes:
Busbar domain (B need to be examined or check for described1,B2…Bi…Bn) in any one need to examine or check busbar BiAffiliated power transformation
It stands, executes following steps:
When third switch is in hot stand-by duty, then utilize Load flow calculation module judge to switch in the closure third and
When disconnecting the 4th switch, whether the overload quantity of the overload circuit is reduced or eliminated;
When the overload quantity is reduced or eliminated, the 5th prompt message is generated, the 5th prompt message includes:It is closed institute
Third switch is stated, and disconnects the 4th switch;
Wherein, the third switch is that need to examine or check busbar BiPower cord on line switching, which refers to for institute
Busbar B need to be examined or check by statingiThe circuit of power supply is provided, and the power cord does not need examination busbar B with described need to examine or check in busbar domainiExcept
Other need to examine or check busbar connection;4th switch is that direction of tide is to flow into that busbar B need to be examined or checkiConnection line on line
Way switch, and the connection line need to examine or check busbar with another and connect.
Optionally, meet S in the overload quantity Δ L1+S2+…+Si+…+SK≤ΔL≤S1+S2+…+Si+…+SK+SK+1
In the case of, risen to the highest generating set group of sensitivity level is adjusted in K+1 using Load flow calculation module judgement
The overload quantity Δ L is not reduced to 0 or meets Δ L >=S in the overload quantity Δ L when full1+S2+…+SmIn the case of, it is described
Circuit overload processing method further includes:
Transformer domain (T need to be examined or check for described1,T2…Ti…Tn) in any need to examine or check transformer TiAffiliated power transformation
It stands, executes following steps:
Pass through the feelings of the 7th switch connection between the connected busbar of the connected busbar of the 5th switch and the 6th switch
Under condition, when the 7th switch is in hot stand-by duty, the 6th switch is in operating status, flows through the 6th switch
Electric current is more than 0, and the transformer belonging to the 6th switch is the transformer C that need to be examined or check except transformer domain1When, it utilizes
Load flow calculation module judges that when being closed the 7th switch and disconnecting the 5th switch, the overload quantity of the overload circuit is
It is no to be reduced or eliminated;
If the overload quantity is reduced or eliminated, and when the connected busbar of the 8th switch busbar connect with the 9th switch
Between be non-Electromagnetic coupling mode, and the tenth between connected the connected busbar of busbar and the 9th switch of the 8th switch opens
When closing in hot stand-by duty, the 6th prompt message is generated, the 6th prompt message includes:It is closed the tenth switch first
And disconnect the 11st switch, be then closed the 7th switch and disconnect the 5th switch, it is finally closed the described 11st and opens
Close and disconnect the tenth switch;
If the overload quantity is reduced or eliminated, and when the connected busbar of the 8th switch busbar connect with the 9th switch
For Electromagnetic coupling mode or when being same busbar, the 7th prompt message is generated, the 7th prompt message includes:It is closed institute
It states the 7th switch and disconnects the 5th switch;
Wherein, the 5th switch is that need to examine or check transformer TiOn middle pressure catch-all or low pressure catch-all, it is described
6th switch is the transformer C1On middle pressure catch-all or low pressure catch-all, the 7th switch and the described tenth open
Pass is bus connection switch or block switch, and the 8th switch need to examine or check transformer T to be describediOn high pressure catch-all, described
Nine switches are the transformer C1On high pressure catch-all, the 11st switch connects busbar for the 8th switch
Line switching on power cord, the power cord refer to the circuit that the busbar connected by the 8th switch provides power supply.
Optionally, overload processing method of the present invention further includes transformer overload processing method, the transformer overload processing
Method includes:
S1 ', overload transformer D is determined1;
S2 ', connection the 14th is opened between the connected busbar of the connected busbar of the 12nd switch and the 13rd switch
In the case of pass, when the 14th switch is in hot stand-by duty, the 13rd switch is in operating status, and flows through institute
When stating the electric current of the 13rd switch more than 0, judges to be closed the 14th switch using the Load flow calculation module and disconnect institute
When stating the 12nd switch, whether the overload quantity of the overload transformer is reduced or eliminated;
If the overload quantity is reduced or eliminated, and connect with sixteenmo pass when the connected busbar of the 15th switch
It is non-Electromagnetic coupling mode between busbar, and the described 15th switchs what connected busbar was connect with sixteenmo pass
When the 17th switch between busbar is in hot stand-by duty, the 8th prompt message is generated, the 8th prompt message includes:It is first
It is first closed the 17th switch and disconnects eighteenmo and close, be then closed the 14th switch and disconnect the described 12nd and open
It closes, finally disconnects the 17th switch and be closed the eighteenmo and close;
If the overload quantity is reduced or eliminated, and connect with sixteenmo pass when the connected busbar of the 15th switch
When busbar is Electromagnetic coupling mode or is same busbar, the 9th prompt message is generated, the 9th prompt message includes:It closes
It closes the 14th switch and disconnects the 12nd switch;
Wherein, the 12nd switch is the overload transformer D1On middle pressure catch-all or low pressure catch-all,
13rd switch is another transformer E1On middle pressure catch-all or low pressure catch-all, it is described 14th switch and institute
It is bus connection switch or block switch to state the 17th switch, and the 15th switch is the overload transformer D1On high pressure by
Master switch, it is E that the sixteenmo, which closes,1On high pressure catch-all, the eighteenmo closes to refer to opening for the described 15th
Close the circuit that connected busbar provides power supply.
In overload processing method provided by the invention, using Load flow calculation module to all or part of generating set group into
The simulation of row output overflow, and then determine that the generating set group for needing overflow and K+j adjust the generating set group of sensitivity level
The minimum load amount of rising, and these information are back to dispatcher.Dispatcher disappears to relevant genset operation
Except overload quantity, to eliminate harm caused by overload or influence.Dispatcher carries out according to prompt message provided by the invention
Corresponding operation, promotes the Ability of emergency management to electric network fault.
Description of the drawings
By reference to attached drawing can be more clearly understood the present invention characteristic information and advantage, attached drawing be schematically without
It is interpreted as carrying out any restrictions to the present invention, in the accompanying drawings:
Fig. 1 shows the flow diagram according to one embodiment of overload processing method of the present invention;
Fig. 2 shows the structural schematic diagrams according to circuit employed in one embodiment of overload processing method of the present invention;
Fig. 3 shows the structural schematic diagram according to circuit employed in another embodiment of overload processing method of the present invention;
Fig. 4 shows the structural schematic diagram according to circuit employed in the another embodiment of overload processing method of the present invention;
Fig. 5 shows the structural schematic diagram according to circuit employed in the another embodiment of overload processing method of the present invention;
Fig. 6 shows the structural schematic diagram according to circuit employed in the another embodiment of overload processing method of the present invention.
Specific implementation mode
To better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real
Mode is applied the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
The present invention provides a kind of overload processing method, and this method includes circuit overload processing method, i.e., occurred in circuit
The circuit overload processing method can be used when load to be handled.
As shown in Figure 1, the circuit overload processing method includes:
S1, overload circuit is determined;
S2, each busbar for being flowed into the electric current in the overload circuit along 220KV network topology circuits are as need
Busbar is examined or check, foundation need to examine or check busbar domain;
For example, as shown in Fig. 2, L1 is overload circuit, the electric current in overload circuit L1 flows into busbar B1, using circuit L2
Into busbar B2, enter busbar B using circuit L33, it is seen that the electric current in overload circuit has flowed into busbar B1, busbar B2, busbar
B3, busbar B1, busbar B2, busbar B3It is the load bus for overloading circuit L1, busbar need to be examined or check as that need to examine or check busbar and be included in
Domain.
S3, by the direct-connected transformer of examination busbar is needed described in each and in the form of line change group outlet opposite end transformer
As that need to examine or check transformer, foundation need to examine or check transformer domain;
For example, as shown in Fig. 2, busbar B1The transformer connected is T1, busbar B2The transformer connected is T2, busbar B3
The transformer connected is T3, transformer T1, transformer T2, transformer T3The load transformer of equal loaded line, as needing to examine or check
Transformer, which is included in, need to examine or check transformer domain.In addition, due to the limitation of the factors such as cost, not each transformer is connected to mother
On line, but with general connection, the electric currents of these transformers is also possible to from overload circuit, therefore being also required to will be damp
Stream direction be to flow out to examine or check the transformer connected on the circuit of busbar and be included in that transformer domain need to be examined or check.
S4, foundation need to swell power unit domain, and the process of establishing that need to swell power unit domain includes:
In all generating sets that need to examine or check busbar connection, judges each generating set and connect the power generation
Whether all connection topological paths between the need examination busbar of unit do not include the overload circuit,
If so, the generating set, which is included in, described need to swell power unit domain;
Otherwise, judged in the generating set output overflow using Load flow calculation module, the overload quantity of the overload circuit
Whether reduce;If the overload quantity reduces, which, which is included in, described need to swell power unit domain;
Understandable to be, the connection topological path between generating set and the need examination busbar for connecting the generating set has
It is a plurality of, when in these connection topological paths comprising overload circuit, it is seen that be to have relationship between the generating set and overload circuit
, therefore power unit domain need to be swelled by being included in.And when not including overload circuit in these connection topological paths, utilize trend meter
Whether overload conditions improve when calculating module simulation generating set output overflow, prove the generating set to overload conditions when improving
Improvement be helpful, therefore power unit domain need to be swelled by being included in.
So-called Load flow calculation module is common module in power grid.Load flow calculation is according to given electric network composition, ginseng
The service condition of the elements such as number and generator, load, determines the calculating of electric system each section steady-state operating condition parameter.Usually
Given service condition has each power supply and the power of load point, pivot point voltage, the voltage of equalization point and phase angle etc. in system.
S5, the generating set that need to be swelled in power unit domain is divided into different grades of power generation according to sensitivity is adjusted
Machine group;
Wherein, the sensitivity that adjusts of each generating set examines or check mother by the need of the generating set and the direct-connected overload circuit
Electrical distance between line determines;
Assuming that it is (G that need to swell power unit domain1,G2…Gu), adjusting sensitivity level is divided into 1,2 ..., and m need to swell power unit
Domain can be expressed as:{(G1,…Gi)1,(Gi+1,…Gj)2,…,(Gk+1,…Gu)m}.Wherein, G1,…Gi)1Spirit is adjusted for the 1st
The generating set group of sensitivity grade, the upper reserve level S of the generating set group1It indicates, (Gk+1,…Gu)mTo adjust sensitivity etc.
The highest generating set group of grade, the upper reserve level S of the generating set groupmIt indicates.
S6, meet S in the overload quantity Δ L of the overload circuit1+S2+…+Si+…+SK≤ΔL≤S1+S2+…+Si+…+
SK+SK+1When, judge that K+1 contributes overflow to the highest generating set group of sensitivity level is adjusted using Load flow calculation module
When, whether the overload quantity Δ L is reduced to 0, SiThe upper reserve level for the generating set group for adjusting sensitivity level for i-th;
S7, when the overload quantity Δ L is reduced to 0, using Load flow calculation module according to adjust sensitivity level from down to
Overflow adjusts the output that sensitivity level is more than the generating set group of k to high sequence successively, and calculating makes the overload quantity Δ L reduce
For the minimum required number j of the generating set group of 0 output overflow;
In the step s 7, the minimum required of the generating set group for the output overflow for making the overload quantity Δ L be reduced to 0 is calculated
Number j, if for example, when K+1 adjusts the generating set group output overflow of sensitivity level, overload quantity Δ L is reduced to 0, then j is
1.If K+1 adjusts the generating set group output overflow of sensitivity level, overload quantity Δ L is not reduced to 0, but when K+2 tune
Save sensitivity level generating set group contribute also overflow when, overload quantity Δ L is reduced to 0, then j be 2.
S8, the generating set group output that sensitivity level is adjusted in K+1 to K+j-1 is calculated using Load flow calculation module
In the case of overflow, the minimum load of the generating set group of K+j adjustings sensitivity level rises when overload quantity Δ L being made to be reduced to 0
Amount, K+j are less than or equal to the peak for adjusting sensitivity level;
S9, the first prompt message is generated, first prompt message includes:1st to K+j-1 adjusts sensitivity level
Generating set group output overflow and K+j adjust sensitivity level generating set group the minimum load amount of rising;
J is calculated in step S7, step S8 calculates the minimum load that K+j adjusts the generating set group of sensitivity level
The amount of rising, step S9 rise by the minimum load of the generating set group for needing overflow and the K+j generating set group for adjusting sensitivity level
Amount feeds back to dispatcher.Dispatcher can be to relevant genset operation, and then eliminates overload quantity, to eliminate overload
Caused harm or influence.
In the specific implementation, the circuit overload processing method may also include:
Meet Δ L >=S in the overload quantity Δ L1+S2+…+SmWhen, generate the second prompt message, the second prompt letter
Breath includes:The equal overflow of all generating sets output that need to be swelled in power unit domain;
Wherein, m is the peak for adjusting sensitivity level.
It is understandable to be, as overload quantity Δ L >=S1+S2+…+Si+…+SmWhen, carrying capacity need to swell power unit more than described
In domain all generators upper spare and, no matter overload quantity Δ L is greater than 10% and is also less than 10% at this time, being required for will be described
All generator output overflows in power unit domain need to be swelled, to reduce overload quantity.
In the specific implementation, the circuit overload processing method may also include:
Using the judgement of Load flow calculation module in K+1 to the adjusting highest generating set of sensitivity level in the step S6
The overload quantity Δ L is not reduced to 0 when group's equal overflow, then generates third prompt message, the third prompt message includes:It is described
The equal overflow of all generating sets output in power unit domain need to be swelled.
It is understandable to be, although Δ L meets S1+S2+…+Si+…+SK≤ΔL≤S1+S2+…+Si+…+SK+SK+1When,
But when the equal overflow of the generating set group of K+1 to K+m adjusting sensitivity levels, overload quantity is not reduced to 0 yet, illustrates
Carrying capacity is very big, needs to need to swell the equal overflow of all generating sets output in power unit domain at this time, to reduce overload quantity.
In the specific implementation, the calculating process of the minimum load amount of rising may include:
In the case where K+1 to K+j-1 adjusts the generating set group output overflow of sensitivity level, according to default step
The long output for increasing K+j and adjusting the generating set group of sensitivity level;
When increasing the n default step-lengths, the overload quantity Δ L is not reduced to 0, and increases the n+1 default step-lengths
Shi Suoshu overload quantity Δs L is reduced to 0, then the minimum load amount of rising is the product of the default step-length and n+1.
For example, default step-length be 20MW, K+j adjust sensitivity level generating set group output risen 2 step-lengths when,
Overload quantity Δ L is not reduced to 0.But when risen 3 step-lengths when, overload quantity Δ L is reduced to 0, then the minimum load amount of rising be 3*20MW
=60MW.
In the specific implementation, meet S in the overload quantity Δ L1+S2+…+Si+…+SK≤ΔL≤S1+S2+…+Si+…+
SK+SK+1In the case of, using Load flow calculation module judgement in K+1 to the adjusting highest generating set of sensitivity level
The overload quantity Δ L is not reduced to 0 or meets Δ L >=S in the overload quantity Δ L when group's equal overflow1+S2+…+SmThe case where
Under, the circuit overload processing method may also include:
Busbar domain (B need to be examined or check for described1,B2…Bi…Bn) in any one need to examine or check busbar BiAffiliated power transformation
It stands, executes following steps:
When further including the 220kV busbares A that need to be examined or check except busbar domain in the substation1, busbar A1With need to examine or check busbar
BiBetween be non-Electromagnetic coupling mode, and when first switch is in hot stand-by duty, judged using the Load flow calculation module
Whether the overload quantity of the overload circuit is reduced or eliminated when being closed the first switch and disconnecting second switch,
When the overload quantity is reduced or eliminated, the 4th prompt message is generated, the 4th prompt message includes:It is closed institute
First switch is stated, and disconnects the second switch;
Wherein, the first switch is busbar A1With need to examine or check busbar BiBetween bus connection switch or block switch, described
Two switches are that direction of tide is to flow into that busbar B need to be examined or checkiConnection line on line switching, and the connection line with another
Busbar connection need to be examined or check.
It is illustrated below with circuit diagram shown in Fig. 3:
First switch is QF1, second switch QF2, and inflow need to examine or check busbar B1Circuit be overload circuit L1.General feelings
Under condition, since first switch QF1 is in hot stand-by duty, busbar A1In electric current may not flow into and need to examine or check busbar B1, and the
Two switch QF2 are closed state, need to examine or check busbar B1It is to be powered by circuit L4, therefore busbar B need to be examined or check1For the load of circuit L4
Busbar.In the case of circuit overload, it is closed using Load flow calculation module simulation first switch QF1, second switch QF2 is disconnected,
In this case, busbar B need to be examined or check1It can be by busbar A1Power supply, to ensure that busbar B need to be examined or check1On load normal operation.Due to this
When need to examine or check busbar B1It no longer needs to overload circuit L1 power supplies, therefore the required load of overload circuit can be reduced or eliminated.
It should be appreciated that direction of tide is to flow into that busbar B need to be examined or checkiConnection line be not necessarily overload circuit,
His general circuit can also, therefore overload circuit in electric current be to enter that busbar B need to be examined or check by the connection linei's.
In the specific implementation, meet S in the overload quantity Δ L1+S2+…+Si+…+SK≤ΔL≤S1+S2+…+Si+…+
SK+SK+1In the case of, using Load flow calculation module judgement in K+1 to the adjusting highest generating set of sensitivity level
The overload quantity Δ L is not reduced to 0 or meets Δ L >=S in the overload quantity Δ L when group's equal overflow1+S2+…+SmThe case where
Under, the circuit overload processing method may also include:
Busbar domain (B need to be examined or check for described1,B2…Bi…Bn) in any one need to examine or check busbar BiAffiliated power transformation
It stands, executes following steps:
When third switch is in hot stand-by duty, then utilize Load flow calculation module judge to switch in the closure third and
When disconnecting the 4th switch, whether the overload quantity of the overload circuit is reduced or eliminated;
When the overload quantity is reduced or eliminated, the 5th prompt message is generated, the 5th prompt message includes:It is closed institute
Third switch is stated, and disconnects the 4th switch;
Wherein, the third switch is that need to examine or check busbar BiPower cord on line switching, which refers to for institute
Busbar B need to be examined or check by statingiThe circuit of power supply is provided, and the power cord does not need examination busbar B with described need to examine or check in busbar domainiExcept
Other need to examine or check busbar connection;4th switch is that direction of tide is to flow into that busbar B need to be examined or checkiConnection line on line
Way switch, and the connection line need to examine or check busbar with another and connect.
It is illustrated below with circuit diagram shown in Fig. 4:
Busbar B need to be examined or check2With need to examine or check busbar B3Between by the 4th switch QF4 connections, the 4th switch under normal circumstances
QF4 is hot stand-by duty, and third switch QF3 is closed state, and power cord L2 is that need to examine or check busbar B2Electric energy is provided.It passes by online
In the case of load, it is closed using the 4th switch QF4 of Load flow calculation module simulation, third switch QF3 is disconnected, and in this case, need to be examined
Look into busbar B2It can be by busbar B need to be examined or check3Power supply, to ensure that busbar B need to be examined or check2On load normal operation.Due to needing to examine or check at this time
Busbar B2It no longer needs circuit L2 to power, is B due to originally overloading the electric current in circuit by circuit L22Power supply, therefore can subtract
Required load that is small or eliminating overload circuit.
In specific implementation, meet S in the overload quantity Δ L1+S2+…+Si+…+SK≤ΔL≤S1+S2+…+Si+…+
SK+SK+1In the case of, using Load flow calculation module judgement in K+1 to the adjusting highest generating set of sensitivity level
The overload quantity Δ L is not reduced to 0 or meets Δ L >=S in the overload quantity Δ L when group's equal overflow1+S2+…+SmThe case where
Under, the circuit overload processing method may also include:
Transformer domain (T need to be examined or check for described1,T2…Ti…Tn) in any need to examine or check transformer TiAffiliated power transformation
It stands, executes following steps:
Pass through the feelings of the 7th switch connection between the connected busbar of the connected busbar of the 5th switch and the 6th switch
Under condition, when the 7th switch is in hot stand-by duty, the 6th switch is in operating status, flows through the 6th switch
Electric current is more than 0, and the transformer belonging to the 6th switch is the transformer C that need to be examined or check except transformer domain1When, it utilizes
Load flow calculation module judges that when being closed the 7th switch and disconnecting the 5th switch, the overload quantity of the overload circuit is
No reduction;
If the overload quantity is reduced or eliminated, and when the connected busbar of the 8th switch busbar connect with the 9th switch
Between be non-Electromagnetic coupling mode, and the tenth between connected the connected busbar of busbar and the 9th switch of the 8th switch opens
When closing in hot stand-by duty, the 6th prompt message is generated, the 6th prompt message includes:It is closed the tenth switch first
And disconnect the 11st switch, be then closed the 7th switch and disconnect the 5th switch, it is finally closed the described 11st and opens
Close and disconnect the tenth switch;
If the overload quantity is reduced or eliminated, and when the connected busbar of the 8th switch busbar connect with the 9th switch
For Electromagnetic coupling mode or when being same busbar, the 7th prompt message is generated, the 7th prompt message includes:It is closed institute
It states the 7th switch and disconnects the 5th switch;
Wherein, the 5th switch is that need to examine or check transformer TiOn middle pressure catch-all or low pressure catch-all, it is described
6th switch is the transformer C1On middle pressure catch-all or low pressure catch-all, the 7th switch and the described tenth open
Pass is bus connection switch or block switch, and the 8th switch need to examine or check transformer T to be describediOn high pressure catch-all, described
Nine switches are the transformer C1On high pressure catch-all, the 11st switch switchs the busbar that connects for the described 8th
Switch between power cord, the power cord refer to the circuit that the busbar connected by the 8th switch provides power supply.
It is illustrated below with circuit diagram shown in fig. 5:
5th switch QF5 is that need to examine or check transformer TiMiddle pressure catch-all or low pressure catch-all, the 6th switch QF6 be
Transformer C1Middle pressure catch-all or low pressure catch-all, what the busbares of the 5th switch QF5 connections was connect with the 6th switch QF6
For busbar by the 7th switch QF7 connections, the 8th switch QF8 is that need to examine or check transformer TiHigh pressure catch-all, the 9th switch QF8
For transformer C1High pressure catch-all, the 8th switch connection busbar and the 9th switch connection busbar between opened by the tenth
QF10 connections are closed, the 11st switch QF11 is the switch on power cord L5.
When being closed the 7th switch QF7 using Load flow calculation module simulation and disconnecting the 5th switch, if the overload of overload circuit
Amount is reduced or eliminated, then explanation can improve the overload conditions of overload circuit by the method.Under normal circumstances, on high-tension side
It is not allow the switch of closed low side, therefore here in two kinds of situation when switch disconnects:
(1) it is hot stand-by duty, and the busbar and the 9th switch QF9 that the 8th switch QF8 is connected in the tenth switch QF10
When being non-Electromagnetic coupling mode between the busbar connected, the high pressure catch-all between two transformers is not connected to.Therefore
It is closed the tenth switch QF10 first and disconnects the 11st switch QF11, reclose the 7th switch QF7 and disconnects the 5th switch QF5,
It is finally closed the 11st switch QF11 and disconnects the tenth switch QF10.
(2) when the connected busbar of the 8th switch busbar connect with the 9th switch is Electromagnetic coupling mode or is same
It is connection when one busbar, between the high pressure catch-all of two transformers, is to need to be closed the 7th switch QF7 and disconnection at this time
5th switch QF5.
When being closed the 7th switch QF7 and disconnecting the 5th switch QF5, the busbar being connect with the 6th switch QF6 is and the 5th
The bussed supply of switch QF5 connections, therefore the required load of overload circuit can be reduced or eliminated.
It, can be by going out for the generating set in unit domain need to be examined or check in circuit overload processing method provided by the invention
Power carries out increase appropriate, to reduce or eliminate overload quantity.It can also be to the switch (circuit as shown in Fig. 3,4,5 in circuit
Switch in figure) it is operated, it is reduced or eliminated and needs to overload the load that circuit provides.When any of the above measure or method not
When can eliminate circuit overload amount, can only turn shifting and meet, therefore prompt message can be generated in this case:Relatively turn
The power that load or drawing-path electricity limiting △ LMW, wherein △ L are moved as the overload circuit after any of the above method reduces overload quantity subtracts
The performance number that the rated power of circuit obtains.
Certainly, in equipment fault, it is possible to lead to circuit overload, it is also possible to lead to transformer overload, therefore this hair
The overload processing method of bright offer may also include transformer overload processing method, which may include:
S1 ', overload transformer D is determined1;
S2 ', connection the 14th is opened between the connected busbar of the connected busbar of the 12nd switch and the 13rd switch
In the case of pass, when the 14th switch is in hot stand-by duty, the 13rd switch is in operating status, and flows through institute
When stating the electric current of the 13rd switch more than 0, judges to be closed the 14th switch using the Load flow calculation module and disconnect institute
When stating the 12nd switch, whether the overload quantity of the overload transformer is reduced or eliminated;
If the overload quantity is reduced or eliminated, and connect with sixteenmo pass when the connected busbar of the 15th switch
It is non-Electromagnetic coupling mode between busbar, and the described 15th switchs what connected busbar was connect with sixteenmo pass
When the 17th switch between busbar is in hot stand-by duty, the 8th prompt message is generated, the 8th prompt message includes:It is first
It is first closed the 17th switch and disconnects eighteenmo and close, be then closed the 14th switch and disconnect the described 12nd and open
It closes, finally disconnects the 17th switch and be closed the eighteenmo and close;
If the overload quantity is reduced or eliminated, and connect with sixteenmo pass when the connected busbar of the 15th switch
When busbar is Electromagnetic coupling mode or is same busbar, the 9th prompt message is generated, the 9th prompt message includes:It closes
It closes the 14th switch and disconnects the 12nd switch;
Wherein, the 12nd switch is the overload transformer D1On middle pressure catch-all or low pressure catch-all,
13rd switch is another transformer E1On middle pressure catch-all or low pressure catch-all, it is described 14th switch and institute
It is bus connection switch or block switch to state the 17th switch, and the 15th switch is the overload transformer D1On high pressure by
Master switch, it is E that the sixteenmo, which closes,1On high pressure catch-all, the eighteenmo closes to refer to opening for the described 15th
Close the circuit that connected busbar provides power supply.
As it can be seen that transformer overload processing method is similar to the circuit overload processing method in Fig. 4, below by taking Fig. 6 as an example into
Row explanation:
12nd switch QF12 is overload transformer D1Middle pressure catch-all or low pressure catch-all, the 13rd switch
QF13 is transformer E1Middle pressure catch-all or low pressure catch-all, the busbar of the 12nd switch QF12 connections opened with the 13rd
The busbar of QF13 connections is closed by the 14th switch QF14 connections, the 15th switch QF15 is overload transformer D1High pressure by total
Switch, it is transformer E that sixteenmo, which closes QF16,1High pressure catch-all, the busbar and sixteenmo of the 15th switch QF1 connections
By the 17th switch QF17 connections between the busbar of pass QF16 connections, it is the switch on power cord L6 that eighteenmo, which closes QF18,.
When being closed the 14th switch QF14 using Load flow calculation module simulation and disconnecting the 12nd switch QF12, if overload becomes
The overload quantity of depressor is reduced or eliminated, then explanation can improve the overload conditions of overload transformer by the method.Ordinary circumstance
Under, it is not allow the switch of closed low side, therefore here in two kinds of situation when on high-tension side switch disconnects:
(1) it is hot stand-by duty, and the busbar and the 16th that the 15th switch QF15 is connected in the 17th switch QF17
When being non-Electromagnetic coupling mode between the busbar that switch QF16 is connected, the high pressure catch-all between two transformers is not to be connected to
's.Therefore it is closed the 17th switch QF17 first and disconnects eighteenmo and closes QF18, recloses the 14th switch QF14 and disconnection
12nd switch QF12 is finally closed eighteenmo and closes QF18 and disconnect the 17th switch QF17.
(2) it is Electromagnetic coupling when the busbar that the 15th switch QF15 is connected closes the busbar that QF16 is connect with sixteenmo
Mode or for same busbar when, be connection between the high pressure catch-all of two transformers, only need to be closed the tenth at this time
The 12nd switch QF12 of four switch QF14 and disconnection.
When being closed the 12nd switch QF12 of the 14th switch QF14 and disconnection, the busbar that is connect with the 13rd switch QF13
For the bussed supply being connect with the 12nd switch QF12, therefore the required load of overload circuit can be reduced or eliminated.If passing through
The overload quantity of this method overload transformer is not reduced to 0, produces prompt message at this time:It relatively adjusts transfer load or draws road
Ration the power supply △ LMW, and wherein △ L are that the high-pressure side power of the overload transformer after the above method reduces overload quantity subtracts transformer volume
Determine the performance number that power obtains.
After certain equipment fault tripping, program can determine whether small regional only with the presence or absence of there is main force's Power Plant band in 220V power grids
The case where vertical operation.Specifically judgment method is:If main force's Power Plant can not find any one along 220kV networks real-time topology
The transformer of platform 500kV is then considered as the small regional independent operating of the unit band, and prompts auxiliary information " unit is with small area
Independent operating ".
In addition, program, which can automatically identify equipment, is in inspecting state, shielding and the device-dependent alarm or failure
Trip information, and state estimation qualification rate also can be improved while reducing wrong report.Specific recognition methods is:If monitoring and certain equipment
All disconnecting links being connected directly are in a point position, then are in inspecting state regarding the equipment.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations are made in the case of bright spirit and scope, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (8)
1. a kind of overload processing method, which is characterized in that including circuit overload processing method, the circuit overload processing method packet
It includes:
S1, overload circuit is determined;
S2, using each busbar that the electric current in the overload circuit is flowed into along 220KV network topology circuits as needing to examine or check
Busbar, foundation need to examine or check busbar domain;
S3, by the direct-connected transformer of examination busbar is needed described in each and in the form of line change group outlet opposite end transformer as
Transformer need to be examined or check, foundation need to examine or check transformer domain;
S4, foundation need to swell power unit domain, and the process of establishing that need to swell power unit domain includes:
In all generating sets that need to examine or check busbar connection, judges each generating set and connect the generating set
Need examination busbar between all connection topological paths whether do not include the overload circuit,
If so, the generating set, which is included in, described need to swell power unit domain;
Otherwise, judged in the generating set output overflow using Load flow calculation module, whether the overload quantity of the overload circuit
Reduce;If the overload quantity reduces, which, which is included in, described need to swell power unit domain;
S5, the generating set that need to be swelled in power unit domain is divided into different grades of generating set according to sensitivity is adjusted
Group;
Wherein, each generating set adjust sensitivity by the generating set with it is direct-connected it is described overload circuit need examination busbar it
Between electrical distance determine;
S6, meet S in the overload quantity Δ L of the overload circuit1+S2+…+Si+…+SK≤ΔL≤S1+S2+…+Si+…+SK+
SK+1When, using Load flow calculation module judge K+1 to adjust sensitivity level highest generating set group output overflow when,
Whether the overload quantity Δ L is reduced to 0, SiThe upper reserve level for the generating set group for adjusting sensitivity level for i-th;
S7, when judging that the overload quantity Δ L is reduced to 0, using Load flow calculation module according to adjust sensitivity level from down to
Overflow adjusts the output that sensitivity level is more than the generating set group of k to high sequence successively, and calculating makes the overload quantity Δ L reduce
For the minimum required number j of the generating set group of 0 output overflow;
S8, the generating set group output overflow that sensitivity level is adjusted in K+1 to K+j-1 is calculated using Load flow calculation module
In the case of, so that overload quantity Δ L is reduced to the minimum load amount of rising that K+j when 0 adjusts the generating set group of sensitivity level, K+
J is less than or equal to the peak for adjusting sensitivity level;
S9, the first prompt message is generated, first prompt message includes:1st to K+j-1 adjusts the hair of sensitivity level
Motor group output overflow and K+j adjust the minimum load amount of rising of the generating set group of sensitivity level.
2. according to the method described in claim 1, it is characterized in that, the circuit overload processing method further includes:
Meet Δ L >=S in the overload quantity Δ L1+S2+…+SmWhen, generate the second prompt message, the second prompt message packet
It includes:The equal overflow of all generating sets output that need to be swelled in power unit domain;
Wherein, m is the peak for adjusting sensitivity level.
3. according to the method described in claim 1, it is characterized in that, the circuit overload processing method further includes:
If using Load flow calculation module judgement in K+1 overflows equal to the adjusting highest generating set group of sensitivity level
The overload quantity Δ L is not reduced to 0, then generates third prompt message, and the third prompt message includes:It is described to swell power machine
The equal overflow of all generating sets output in group domain.
4. according to the method described in claim 1, it is characterized in that, the calculating process of the minimum load amount of rising includes:
In the case where K+1 to K+j-1 adjusts the generating set group output overflow of sensitivity level, increase according to default step-length
K+j is added to adjust the output of the generating set group of sensitivity level;
When increasing the n default step-lengths, the overload quantity Δ L is not reduced to 0, and increases n+1 default step-length when institutes
It states overload quantity Δ L and is reduced to 0, then the minimum load amount of rising is the product of the default step-length and n+1.
5. according to any methods of claim 1-4, which is characterized in that
Meet S in the overload quantity Δ L1+S2+…+Si+…+SK≤ΔL≤S1+S2+…+Si+…+SK+SK+1In the case of, profit
Judge the overload in K+1 overflows equal to the adjusting highest generating set group of sensitivity level with the Load flow calculation module
Amount Δ L is not reduced to 0 or meets Δ L >=S in the overload quantity Δ L1+S2+…+SmIn the case of, the circuit overload processing
Method further includes:
Busbar domain (B need to be examined or check for described1,B2…Bi…Bn) in any one need to examine or check busbar BiAffiliated substation, holds
Row following steps:
When further including the 220kV busbares A that need to be examined or check except busbar domain in the substation1, busbar A1With need to examine or check busbar BiIt
Between be non-Electromagnetic coupling mode, and when first switch is in hot stand-by duty, judge be closed using the Load flow calculation module
Whether the overload quantity of the overload circuit is reduced or eliminated when the first switch and disconnection second switch,
When the overload quantity is reduced or eliminated, the 4th prompt message is generated, the 4th prompt message includes:It is closed described
One switch, and disconnect the second switch;
Wherein, the first switch is busbar A1With need to examine or check busbar BiBetween bus connection switch or block switch, described second opens
Pass is that direction of tide is to flow into that busbar B need to be examined or checkiConnection line on line switching, and the connection line is examined with another need
Look into busbar connection.
6. according to any methods of claim 1-4, which is characterized in that meet S in the overload quantity Δ L1+S2+…+Si
+…+SK≤ΔL≤S1+S2+…+Si+…+SK+SK+1In the case of, using Load flow calculation module judgement in K+1 to tune
The overload quantity Δ L is not reduced to 0 or in the overload quantity Δ L when section highest generating set group of sensitivity level equal overflow
Meet Δ L >=S1+S2+…+SmIn the case of, the circuit overload processing method further includes:
Busbar domain (B need to be examined or check for described1,B2…Bi…Bn) in any one need to examine or check busbar BiAffiliated substation, holds
Row following steps:
When third switch is in hot stand-by duty, then judge be closed the third switch and disconnecting using Load flow calculation module
When the 4th switch, whether the overload quantity of the overload circuit is reduced or eliminated;
When the overload quantity is reduced or eliminated, the 5th prompt message is generated, the 5th prompt message includes:It is closed described
Three switches, and disconnect the 4th switch;
Wherein, the third switch is that need to examine or check busbar BiPower cord on line switching, which refers to that need to be examined to be described
Look into busbar BiThe circuit of power supply is provided, and the power cord does not need examination busbar B with described need to examine or check in busbar domainiExcept other
Busbar connection need to be examined or check;4th switch is that direction of tide is to flow into that busbar B need to be examined or checkiConnection line on circuit open
It closes, and the connection line need to examine or check busbar with another and connect.
7. according to any methods of claim 1-4, which is characterized in that meet S in the overload quantity Δ L1+S2+…+Si
+…+SK≤ΔL≤S1+S2+…+Si+…+SK+SK+1In the case of, using Load flow calculation module judgement in K+1 to tune
The overload quantity Δ L is not reduced to 0 or in the overload quantity Δ L when section highest generating set group of sensitivity level equal overflow
Meet Δ L >=S1+S2+…+SmIn the case of, the circuit overload processing method further includes:
Transformer domain (T need to be examined or check for described1,T2…Ti…Tn) in any need to examine or check transformer TiAffiliated substation, holds
Row following steps:
In the case of connection by the 7th switch between the connected busbar of the connected busbar of the 5th switch and the 6th switch,
When the 7th switch is in hot stand-by duty, the 6th switch is in operating status, flows through the electric current of the 6th switch
More than 0, and the transformer belonging to the 6th switch is the transformer C that need to be examined or check except transformer domain1When, utilize trend
Computing module judges, when being closed the 7th switch and disconnecting the 5th switch, whether the overload quantity of the overload circuit subtracts
Small or elimination;
If the overload quantity is reduced or eliminated, and when between the 8th the connected busbar of switch and the connected busbar of the 9th switch
For non-Electromagnetic coupling mode, and at the tenth switch between connected the connected busbar of busbar and the 9th switch of the 8th switch
When hot stand-by duty, the 6th prompt message is generated, the 6th prompt message includes:It is closed the tenth switch first and breaks
Open the 11st switch, be then closed it is described 7th switch and disconnect it is described 5th switch, be finally closed it is described 11st switch and
Disconnect the tenth switch;
If the overload quantity is reduced or eliminated, and when the connected busbar of the 8th switch busbar connect with the 9th switch is to close
Inscription of loop mode or for same busbar when, generate the 7th prompt message, the 7th prompt message includes:It is closed described
Seven switch and disconnect the 5th switch;
Wherein, the 5th switch is that need to examine or check transformer TiOn middle pressure catch-all or low pressure catch-all, the described 6th opens
It is the transformer C to close1On middle pressure catch-all or low pressure catch-all, it is described 7th switch and it is described tenth switch is
Bus connection switch or block switch, the 8th switch need to examine or check transformer T to be describediOn high pressure catch-all, it is described 9th switch
For the transformer C1On high pressure catch-all, it is described 11st switch for it is described 8th switch connect busbar power cord
On line switching, which refers to the circuit that power supply is provided by the busbar that connects of the 8th switch.
8. according to any methods of claim 1-4, which is characterized in that further include transformer overload processing method, it is described
Transformer overload processing method includes:
S1 ', overload transformer D is determined1;
S2 ', the 14th switch of connection between the connected busbar of the connected busbar of the 12nd switch and the 13rd switch
In the case of, when the 14th switch is in hot stand-by duty, the 13rd switch is in operating status, and flows through described the
When the electric currents of 13 switches are more than 0, judge to be closed the 14th switch using the Load flow calculation module and disconnect described the
When 12 switch, whether the overload quantity of the overload transformer is reduced or eliminated;
If the overload quantity is reduced or eliminated, and when the connected busbar of the 15th switch closes connect busbar with sixteenmo
Between be non-Electromagnetic coupling mode, and the busbar busbar connect with sixteenmo pass that the 15th switch is connected
Between the 17th switch in hot stand-by duty when, generate the 8th prompt message, the 8th prompt message includes:It closes first
It closes the 17th switch and disconnects eighteenmo and close, be then closed the 14th switch and disconnect the 12nd switch,
It finally disconnects the 17th switch and is closed the eighteenmo and close;
If the overload quantity is reduced or eliminated, and when the connected busbar of the 15th switch closes connect busbar with sixteenmo
For Electromagnetic coupling mode or when being same busbar, the 9th prompt message is generated, the 9th prompt message includes:It is closed institute
It states the 14th switch and disconnects the 12nd switch;
Wherein, the 12nd switch is the overload transformer D1On middle pressure catch-all or low pressure catch-all, described
13 switches are another transformer E1On middle pressure catch-all or low pressure catch-all, it is described 14th switch and the described tenth
Seven switches are bus connection switch or block switch, and the 15th switch is the overload transformer D1On high pressure always opened
It closes, it is E that the sixteenmo, which closes,1On high pressure catch-all, the eighteenmo closes to refer to switching institute for the described 15th
The busbar of connection provides the circuit of power supply.
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CN109672171B (en) * | 2018-12-06 | 2022-02-22 | 国网天津市电力公司 | Automatic control strategy for eliminating 500kV transformer overload |
CN109672225B (en) * | 2018-12-06 | 2022-02-22 | 国网天津市电力公司 | Automatic control strategy for adjusting and eliminating overload of 220kV transformer |
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CN102195291A (en) * | 2011-05-18 | 2011-09-21 | 江苏省电力公司苏州供电公司 | Automatically identifying control method for main transformer overload joining-cutting load based on running mode |
CN102751735A (en) * | 2011-04-19 | 2012-10-24 | 巨争号 | Generating set output reducing and generating set tripping device used in case of overload of contact outgoing lines of power plant |
CN103280804A (en) * | 2013-06-25 | 2013-09-04 | 国家电网公司 | Subarea loop closing support method for solving problem of main transformer overload of subarea power grid |
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CN102751735A (en) * | 2011-04-19 | 2012-10-24 | 巨争号 | Generating set output reducing and generating set tripping device used in case of overload of contact outgoing lines of power plant |
CN102195291A (en) * | 2011-05-18 | 2011-09-21 | 江苏省电力公司苏州供电公司 | Automatically identifying control method for main transformer overload joining-cutting load based on running mode |
CN103280804A (en) * | 2013-06-25 | 2013-09-04 | 国家电网公司 | Subarea loop closing support method for solving problem of main transformer overload of subarea power grid |
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