CN103020713A - Intelligent substation fault diagnosis method combining topology and relay protection logic - Google Patents

Abstract

The invention discloses an intelligent substation fault diagnosis method combining topology and relay protection logic. The intelligent substation fault diagnosis method combining the topology and the relay protection logic comprises the following steps of: analyzing network topology modeling processes of a primary system and a secondary system of an intelligent substation; equivalently replacing all groups with a node quantity of 3 by a group node; simplifying an undirected graph; providing a logical inference method in fit with a Petri net principle according to an extension coefficient, a transition function and a transition function; searching logical relation of the primary system and the secondary system by using the entire intelligent substation system as a whole body; and carrying out a fault diagnosis reasoning process through the logical relation of the primary system and the secondary system. The intelligent substation fault diagnosis method is applied to the fault diagnosis reasoning of an intelligent substation, has the advantages of simple, efficient and rapid network topology constructing and searching process, practical fault diagnosis process and accurate result, and can be used for laying a good foundation for operations, such as fault diagnosis and the like, of the intelligent substation.

Description

A kind of in conjunction with the intelligent substation method for diagnosing faults of topology with the relay protection logic

Technical field

The present invention relates to a kind of Fault Diagnosis for Substation determination methods, relate in particular to a kind of in conjunction with the intelligent substation method for diagnosing faults of topology with the relay protection logic.

Background technology

Transformer station is as the important pivot of power transmission and distribution in the electric system, and its fault diagnosis and accident treatment are to improving Power System Security And Reliability, preventing pernicious power outage significant.

After the intelligent substation, its electrical secondary system Structure and form is compared the generation revolutionary variation with conventional substation, secondary circuit adopts hardwire in the conventional substation, there are one to one mapping relations in the input and output of information or signal between the functional configuration of this physics wiring and transformer station and the function, therefore the secondary connection that has physical entity is the form of expression of conventional substation electrical secondary system, can monitor and analyze transformer station's fault by the detection of secondary connection.The intelligent substation electrical secondary system then shows as the communication network bearing function logical signal of physics, and conventional secondary circuit becomes communication network, and the connection between the signal becomes virtual terminal and virtual circuit.No longer there is one-to-one relationship between the input and output of network physical topology and function information and signal, fault detect and analytical approach based on the secondary electric air circuit can't be applied to intelligent substation fully, cause the business such as intelligent substation fault detect and analysis are difficult to carry out.This shows, the variation of intelligent substation electrical secondary system structure and robotization and intelligent requirements raising to administering and maintaining means, traditional fault diagnosis and appraisal procedure can not satisfy the demand of intelligent substation operation on the diagnosis degree of depth and diagnostic method.But simultaneously electrical secondary system networking is also for realizing that more efficient, comprehensive, deep Fault Diagnosis for Substation and appraisal procedure provides chance and realization means.Existing transformer station power transmission and transforming equipment fault diagnosis model only relates to the fault element location of primary system mostly, the electrical secondary system fault diagnosis rarely has and relates to, and utilize intelligent substation primary system, electrical secondary system network topology and the logic association method of combining to carry out fault diagnosis reasoning, not yet form so far Systems Theory.

Summary of the invention

Purpose of the present invention is exactly in order to address the above problem, and a kind of intelligent substation fault diagnosis determination methods is provided, and it has, and process is simple, Fast Practical, establishes the advantage of good basis for the intelligent substation fault diagnosis.

To achieve these goals, the present invention adopts following technical scheme:

A kind of in conjunction with the intelligent substation method for diagnosing faults of topology with the relay protection logic, concrete steps are:

Step 1: each element in primary equipment, secondary device, the network equipment is mapped as respectively node, forms the non-directed graph I that reflection intelligent substation physical topology connects;

Step 2: in non-directed graph I, search all nodes and be 3 and above group, and with its respectively equivalence replace to group's node, formation non-directed graph II after replacing;

Step 3: non-directed graph II is begun BFS (Breadth First Search) from arbitrary starting point, and the sequencing by node and group's node searching in the way is connected to form directed arc;

Step 4: the terminal point of search is power supply, load feeder line and network leaf node equipment, generation threaded tree T after search is finished;

Step 5: to the sequencing of the group's node among the threaded tree T according to its three limits access, generate the threaded tree of former group, will roll into a ball node and replace, finally form threaded tree II;

Step 6: primary equipment, secondary device and physical connection relation thereof with threaded tree II describes, be mapped in the Petri net, form storehouse institute separately, form simultaneously the Petri pessimistic concurrency control of fault diagnosis;

Step 7: after forming the Petri pessimistic concurrency control of fault diagnosis, Petri net fault diagnosis model is according to the protection action message of receiving, isolating switch action message and interdependent node current-voltage sampling value, and this information is distributed into relevant protective relaying device and isolating switch storehouse institute with the form of Tuo Ken;

Step 8: definition extension coefficient, transition function and transfer function;

Step 8: agree in the diagnostic procedure of transition in holder, the reasoning from logic by extension coefficient, transition function, transfer function cooperate Petri to net obtains final fault diagnosis result, the primary equipment of location fault.

Group in the described step 2 is when to be that transformer station is inner exist the complicated primary connection mode such as 3/2 wiring, or when there are the complex topology such as dual-ring network in communication network, the annular subgraph that in associated diagram, will show as, with this annular subgraph " group " representation, " unity structure " is defined as the vertex subset that exists in non-directed graph IIG (V, E) Vertex set V, the element number that contains among the vertex subset V ' | V ' |=positive integer J and in V ' any two summits frontier juncture connection E among the G (V, E) is arranged, " group " is radial tree structure for the ring structure decoupling zero with complexity.

Petri net described in the described step 6 is by a four-tuple (S (t), T _t, F, M ₀) a dynamic logic net is described, wherein the element of S (t) is called storehouse institute, the initial intermediateness that maybe may exist of the represented respective element in storehouse; T _tElement be called transition, transition represent to want to make the storehouse in the cloth willing condition that satisfies of starting going to a nursery, the dynamic behaviour of system is by asking the changes in distribution of agreeing gather in the storehouse to reflect, and holder to agree the variation of number be that triggering by transition realizes; F describes the flow relation of Petri net, represents by directed edge; Vector M ₀The vector that the initial marking of expression Petri net, initial marking namely are comprised of the corresponding storehouse institute corresponding element of Tuo Ken.

The concrete steps of described step 6 are:

(6-1) threaded tree is mapped to Petri when net, primary equipment, secondary protective relaying device and logical message thereof number are mapped as storehouse institute in the Petri net, represent with circle in the drawings;

(6-2) storehouse topological relation and the matching relationship of protection on setting time described according to threaded tree carry out prioritization; When all holders of certain storehouse are agree, represent that the protection on this branch direction is finally moved, for each branch, all be to cooperate to realize storehouse institute and transition configuration according to protection, the logic of isolating switch on the space-time direction, form the Petri pessimistic concurrency control of fault diagnosis.

(6-3) on figure, the S of storehouse institute (t) represents with circle, transition T _tRepresent that with vertical line flow relation is with representing with the arc of arrow, holder agree with the storehouse in pore represent.

Extension coefficient in the described step 8: in diagnostic procedure, when changing for the method for operation at protective relaying device setting principle or electrical network, the related situation that can represent dynamically protective relaying device and primary equipment, the protection domain of relay protection protective device is quantified as a constant n, and constant n is the extension coefficient;

Described transition function: cooperate the protection of logic to net the confidence level that each bar branch moves at Petri in order to calculate the different priorities protection or to exist; define a transition function; as variable, the definition of transition function is suc as formula (1) with the degree of confidence of single protective relaying device and primary equipment for the transition function:

${\mathrm{\δ}}_i^{\′}=k({\mathrm{\δ}}_1,...,{\mathrm{\δ}}_2,{\mathrm{\δ}}_{\mathrm{CB}})={\mathrm{\δ}}_{\mathrm{CB}}{\mathrm{\δ}}_i\underset{j=0}{\overset{i-1}{\mathrm{\Π}}}(1-{\mathrm{\δ}}_j)---\left(1\right)$

I and j are the sequence number of protective relaying device in this function, δ _i, δ _jBe respectively the degree of confidence of protective relaying device i and j, δ _CBBe isolating switch degree of confidence, δ _i' be the degree of confidence of protection i with respect to primary equipment, and regulation δ ₀=0, when isolating switch storehouse institute or relay protection storehouse institute not cloth start going to a nursery willing, corresponding δ _iAnd δ _jBe zero, the δ that finally obtains _i' when having shown certain relay protection action, the probability of malfunction of which primary equipment is the highest.

Described transfer function comprises logical signal transfer function and fault element transfer function, and in diagnostic procedure, the logic of transformer station cooperates following situation can occur: the logic output of certain protective relaying device needs the logic input of a plurality of devices to determine; The acting in conjunction of many cover protective relaying devices, the excision fault element; This knowledge shows as transition in Petri net has a plurality of the holder with class libraries and agree input, so has defined transfer function.

Described logical signal transfer function:

${\mathrm{\δ}}_i=f_1\left(\mathrm{\δ}\right)=f_1({{\mathrm{\δ}}_1}^{\′},...,{{\mathrm{\δ}}_n}^{\′})=\underset{i=1}{\overset{n}{\mathrm{\Π}}}{\mathrm{\δ}}_i^{\′}---\left(2\right)$

Described fault element transfer function is:

${\mathrm{\δ}}_t=f_2\left(\mathrm{\δ}\right)=f_2({{\mathrm{\δ}}_1}^{\′},...,{{\mathrm{\δ}}_n}^{\′})=1-\underset{i=1}{\overset{n}{\mathrm{\Π}}}\left(1-{\mathrm{\δ}}_i^{\′}\right)---\left(3\right)$

Wherein, i is the sequence number of protective relaying device, and i is more than or equal to 1 less than or equal to n, and n is the extension coefficient, δ _i' for protecting i with respect to the degree of confidence of element, δ _tBe the confidence level that suspect device breaks down, δ is set (δ ₁' ..., δ _n').

Beneficial effect of the present invention:

The present invention is based on network topology structure and function logic knowledge, utilize Petri net theory to propose a kind of intelligent substation Fault Diagnosis Inference, propose the group's of use node and replaced annular complex topology structure to simplify the method for non-directed graph, expanded the range of application based on the method for diagnosing faults of topological structure; Proposed in conjunction with except protective relaying device fault message with communication network topology structural information etc. carry out the method for intelligent substation fault reasoning, the lifting of information utilization has improved the degree of accuracy of fault diagnosis; The different priorities protection of definition transition function calculation or existence cooperate the protection of logic to net the confidence level that each bar branch moves at Petri; having defined transfer function solves transition and has a plurality of the holder with class libraries and agree input; match with Petri net theory with this, expanded the range of application of reasoning from logic.

Description of drawings

Fig. 1 (a) is the typical case of transformer station boundary mode;

Fig. 1 (b) is for comprising the non-directed graph I of three limits group in the transformer station;

Non-directed graph II in Fig. 1 (c) transformer station behind the abbreviation;

Fig. 1 (d) is threaded tree corresponding in the transformer station;

Fig. 2 (a) is the substation communication network system diagram;

Fig. 2 (b) is threaded tree corresponding to substation communication network;

Fig. 3 is that the function logic of transformer station's one electrical secondary system cooperates model.

Embodiment

The invention will be further described below in conjunction with accompanying drawing and embodiment.

Take the Substation Bus Arrangement shown in Fig. 1 (a) as example, wherein comprise typical 3/2 breaker connection, the thinking that adopts " group " structure to unlink is as follows:

Step 1: primary equipment, secondary device, the network equipment are mapped as node, form the non-directed graph that reflection intelligent substation physical topology connects, shown in Fig. 1 (b);

Step 2: all the complicated ring structures in the non-directed graph are carried out Open Loop Operation, and its method is that to search all nodes be 3 group, and with its respectively equivalence replace to group's node, form non-directed graph after replacing;

Search all nodes and be 3 group, and with its respectively equivalence replace to group's node, the non-directed graph after the replacement is shown in Fig. 1 (c);

Step 3: non-directed graph is begun to carry out BFS (Breadth First Search) from arbitrary starting point, and the terminal point of search is power supply, load feeder line and network leaf node equipment, and the sequencing by node searching in the way connects, and forms directed arc, generates threaded tree T;

Step 4: to the sequencing of the group's node among the T according to its three limits access, generate the threaded tree of former group, will roll into a ball node and replace, the final simple threaded tree that forms the connection of reflection intelligent substation physical topology is such as Fig. 1 (d).

Substation communication network also adopts same method; Fig. 2 (a) is the communication network topology of transformer station among Fig. 1 (a); this communication network is with the 500kV route protection; bus protection; the 110kV route protection; bus protection; the secondary device such as transformer differential protection and breaker fail protection connects into the nonredundancy stellate reticulum by 4 switches; can adopt equally oriented associated diagram that it is carried out topology describes; threaded tree behind the abbreviation is shown in Fig. 2 (b); if there are the complex network topologies such as multi-ring network; can adopt equally " figure " decomposition method to process by this method; can be with the complex topology abbreviation, form that available topological knowledge is expressed and topology search method fast.

Step 5: primary equipment, secondary protective relaying device and physical connection relation thereof with threaded tree is described, be mapped in the Petri pessimistic concurrency control, wherein the mapping of primary equipment, secondary device forms storehouse institute, represents with circle in the drawings.

The Petri net is by a four-tuple (S (t), T _t, F, M ₀) a dynamic logic net is described, wherein the element of S (t) is called storehouse institute, the initial intermediateness that maybe may exist of the represented respective element in storehouse; T _tElement be called transition, transition represent to want to make the storehouse in the cloth willing condition that satisfies of starting going to a nursery, the dynamic behaviour of system is by asking the changes in distribution of agreeing gather in the storehouse to reflect, and holder to agree the variation of number be that igniting by transition realizes; F describes the flow relation of net, represents by directed edge; Vector M ₀The vector that the initial marking of expression Petri net, initial marking namely are comprised of the corresponding storehouse institute corresponding element of Tuo Ken.

When threaded tree is mapped to the Petri pessimistic concurrency control; primary equipment, secondary protective relaying device and logical message thereof number are mapped as storehouse institute in the Petri net, the topological relation that storehouse institute is described according to aforesaid threaded tree and protect the matching relationship on setting time to carry out prioritization.When all holders of certain storehouse are agree, represent that the protection on this branch direction is finally moved, for each branch, all be to cooperate to realize storehouse institute and transition configuration according to protection, the logic of isolating switch on the space-time direction, form the Petri pessimistic concurrency control of fault diagnosis.On figure, the S of storehouse institute (t) represents with circle, and transition Tt represents with vertical line, and flow relation represents with the arc with arrow, holder agree with the storehouse in pore represent.

Suppose Fig. 1 (a) L2 of transformer station fault; the breaker fail protection action; its corresponding logical process is described as shown in Figure 3 with the Petri net; primary equipment in Fig. 3 system, secondary protective relaying device and logical message thereof number are mapped as storehouse institute, the storehouse sort according to topological relation and the matching relationship of protection on setting time of relevance tree.

Step 6: after forming the Petri pessimistic concurrency control of fault diagnosis; diagnostic model is according to the protection action message of receiving, isolating switch action message and interdependent node current-voltage sampling value, and this information is distributed into relevant protective relaying device and isolating switch storehouse institute with the form of Tuo Ken.

In the transformer station, various protective relaying devices calculate separately protection domain by different principle and setting principle.In order to the electrical equipment that represents that protection can be applied to.In diagnostic procedure; when changing for the method for operation at protective relaying device setting principle or electrical network; can represent dynamically the related situation of protective relaying device and primary equipment, this method is quantified as a constant n (being called the extension coefficient in this method) with the protection domain of relay protection protective device.The incidence relation of protective relaying device and primary equipment can obtain by calling n step threaded tree.Collection triggers if transition is the circuit transition, and then the extension coefficient n of this protective relaying device subtracts 1 automatically, and this holder agree stop transition when the extension coefficient is zero, agree come the failure judgement element by judging whether cloth is started going to a nursery in the institute of terminal point storehouse at last.

Simultaneously; in order to calculate different priorities protection (such as main protection, back-up protection) or to exist the protection that cooperates logic (such as route protection and the breaker fail protection of cooperation with it) to net the confidence level that each bar branch moves at Petri; this method has defined a transition function; as variable, its definition is suc as formula (1) with the degree of confidence of single protective relaying device and primary equipment for this function:

${\mathrm{\δ}}_i^{\′}=k({\mathrm{\δ}}_1,...,{\mathrm{\δ}}_2,{\mathrm{\δ}}_{\mathrm{CB}})={\mathrm{\δ}}_{\mathrm{CB}}{\mathrm{\δ}}_i\underset{j=0}{\overset{i-1}{\mathrm{\Π}}}(1-{\mathrm{\δ}}_j)---\left(1\right)$

δ in this function _i, δ _jBe respectively the degree of confidence of protective relaying device i and j, δ _CBBe isolating switch degree of confidence, δ _i' be protective relaying device i with respect to the degree of confidence of primary equipment, and the regulation δ ₀=0, when isolating switch storehouse institute or relay protection storehouse institute not cloth start going to a nursery willing (being all actions of relay protection and isolating switch) corresponding δ _iAnd δ _jBe zero.The δ that finally obtains _i' when having shown certain relay protection action, the probability of malfunction of which primary equipment is the highest.

In addition, in diagnostic procedure, the logic of transformer station cooperates following situation can occur: the logic output of certain protective relaying device needs the logic input of a plurality of devices to determine; The acting in conjunction of many cover protective relaying devices, excision fault element (protecting ultra-high-tension power transmission line pilot protection etc. such as the both-end amount); This knowledge shows as transition in Petri net has a plurality of the holder with class libraries and agree input, and this method defines a transfer function δ _tCharacterize, definition is suc as formula shown in (2) and (3):

The logical signal transfer function:

The fault element transfer function: ${\mathrm{\δ}}_t=f_2\left(\mathrm{\δ}\right)=f_2({{\mathrm{\δ}}_1}^{\′},...,{{\mathrm{\δ}}_n}^{\′})=1-\underset{i=1}{\overset{n}{\mathrm{\Π}}}\left(1-{\mathrm{\δ}}_i^{\′}\right)---\left(3\right)$

Wherein, δ _i' be that protective relaying device i is with respect to the degree of confidence of element, δ _tThe confidence level that breaks down for suspect device.In model, can according to relay protection and isolating switch storehouse Tuo Ken be distributed into situation, transition function and transfer function calculating value are determined whether correct operation of relay protection or isolating switch, whether have malfunction, tripping.Whether equipment is that faulty equipment is finally assert by the fault credibility value that transition function and transfer function calculate.

Agree in the diagnostic procedure of transition in holder, the reasoning from logic by above-mentioned extension coefficient, transition function, transfer function cooperate Petri to net obtains final fault diagnosis result, the primary equipment of location fault.

Fig. 3 is that the function logic of transformer station's one electrical secondary system cooperates model, and among Fig. 3,1 to 6 represents isolating switch, and B1, B2 are bus, and a is circuit L2 protection action; B is circuit L2 excess current; C is that breaker fail protection starts; D is the action of B2 bus composite voltage; E is the breaker fail protection tripping operation.

Although above-mentionedly by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.

Claims (8)

1. one kind in conjunction with topology and the intelligent substation method for diagnosing faults of relay protection logic, it is characterized in that concrete steps are:

Step 1: each element in primary equipment, secondary device, the network equipment is mapped as node, forms the non-directed graph I that reflection intelligent substation physical topology connects;

Step 2: the complicated ring structure of all in non-directed graph I unlinks, and searches all nodes and be 3 group, and with its respectively equivalence replace to group's node, form non-directed graph II after replacing;

Step 3: non-directed graph II is begun BFS (Breadth First Search) from arbitrary starting point, and the sequencing by node and group's node searching in the way is connected to form directed arc;

Step 4: the terminal point of search is power supply, load feeder line and network leaf node equipment, generation threaded tree T after search is finished;

Step 5: to the sequencing of the group's node among the threaded tree T according to its three limits access, generate the threaded tree of former group, will roll into a ball node and replace, finally form threaded tree II;

Step 6: with the primary equipment of threaded tree II description, the physical connection relation of secondary device, be mapped in the Petri net, form the Petri pessimistic concurrency control of fault diagnosis;

Step 7: after forming the Petri pessimistic concurrency control of fault diagnosis, Petri net fault diagnosis model is according to the protection action message of receiving, isolating switch action message and interdependent node current-voltage sampling value, and this information is distributed into relevant protective relaying device and isolating switch storehouse institute with the form of Tuo Ken;

Step 8: definition extension coefficient, transition function and transfer function;

Step 9: agree in the diagnostic procedure of transition in holder, the reasoning from logic by extension coefficient, transition function, transfer function cooperate Petri to net obtains final fault diagnosis result, the primary equipment of location fault.

2. a kind of in conjunction with the intelligent substation method for diagnosing faults of topology with the relay protection logic as claimed in claim 1; it is characterized in that; group in the described step 2 is when to be that transformer station is inner exist the complicated primary connection mode such as 3/2 wiring; or when there are the complex topology such as dual-ring network in communication network; the annular subgraph that in associated diagram, will show as; this annular subgraph with " group " representation, is defined as the vertex subset that exists in non-directed graph IIG (V, E)

Vertex set V, the vertex subset element number | V ' |=positive integer J and in vertex subset V ' any two summits frontier juncture connection E among the G (V, E) is arranged, " group " is radial tree structure for the ring structure decoupling zero with complexity.

3. a kind of in conjunction with the intelligent substation method for diagnosing faults of topology with the relay protection logic as claimed in claim 1, it is characterized in that Petri net described in the described step 6 is by a four-tuple (S (t), T _t, F, M ₀) a dynamic logic net is described, wherein the element of S (t) is called storehouse institute, the initial intermediateness that maybe may exist of the represented respective element in storehouse; T _tElement be called transition, transition represent to want to make the storehouse in the cloth willing condition that satisfies of starting going to a nursery, the dynamic behaviour of system is by asking the changes in distribution of agreeing gather in the storehouse to reflect, and holder to agree the variation of number be that triggering by transition realizes; F describes the flow relation of Petri net, represents by directed edge; Vector M ₀The vector that the initial marking of expression Petri net, initial marking namely are comprised of the corresponding storehouse institute corresponding element of Tuo Ken.

4. a kind of in conjunction with the intelligent substation method for diagnosing faults of topology with the relay protection logic as claimed in claim 1, it is characterized in that the concrete steps of described step 6 are:

(6-1) threaded tree is mapped to Petri when net, primary equipment, secondary protective relaying device and logical message thereof number are mapped as storehouse institute in the Petri net, represent with circle in the drawings;

(6-2) storehouse topological relation and the matching relationship of protection on setting time described according to threaded tree carry out prioritization; When all holders of certain storehouse are agree, represent that the protection on this branch direction is finally moved, for each branch, all be to cooperate to realize storehouse institute and transition configuration according to protection, the logic of isolating switch on the space-time direction, form the Petri pessimistic concurrency control of fault diagnosis.

(6-3) on figure, the S of storehouse institute (t) represents with circle, transition T _tRepresent that with vertical line flow relation is with representing with the arc of arrow, holder agree with the storehouse in pore represent.

5. a kind of in conjunction with the intelligent substation method for diagnosing faults of topology with the relay protection logic as claimed in claim 1; it is characterized in that; extension coefficient in the described step 8: in diagnostic procedure; when changing for the method for operation at protective relaying device setting principle or electrical network; the related situation that can represent dynamically protective relaying device and primary equipment; the protection domain of relay protection protective device is quantified as a constant n, and constant n is the extension coefficient.

6. a kind of in conjunction with the intelligent substation method for diagnosing faults of topology with the relay protection logic as claimed in claim 1; it is characterized in that; transition function in the described step 8: cooperate the protection of logic to net the confidence level that each bar branch moves at Petri in order to calculate the different priorities protection or to exist; define a transition function; as variable, the definition of transition function is suc as formula (1) with the degree of confidence of single protective relaying device and primary equipment for the transition function:

${\mathrm{\δ}}_i^{\′}={\mathrm{\δ}}_{\mathrm{CB}}{\mathrm{\δ}}_i\underset{j=0}{\overset{i-1}{\mathrm{\Π}}}(1-{\mathrm{\δ}}_j)---\left(1\right)$

I and j are the sequence number of protective relaying device in this function, δ _i, δ _jBe respectively the degree of confidence of protective relaying device i and j, δ _CBBe isolating switch degree of confidence, δ _i' be protective relaying device i with respect to the degree of confidence of primary equipment, and the regulation δ ₀=0.

7. a kind of in conjunction with the intelligent substation method for diagnosing faults of topology with the relay protection logic as claimed in claim 1, it is characterized in that, described transfer function comprises logical signal transfer function and fault element transfer function, in diagnostic procedure, the logic of transformer station cooperates following situation can occur: the logic output of certain protective relaying device needs the logic input of a plurality of devices to determine; The acting in conjunction of many cover protective relaying devices, the excision fault element; This knowledge shows as transition in Petri net has a plurality of the holder with class libraries and agree input, defines transfer function.

8. a kind of in conjunction with the intelligent substation method for diagnosing faults of topology with the relay protection logic as claimed in claim 7, it is characterized in that described transfer function comprises logical signal transfer function and fault element transfer function;

Described logical signal transfer function:

${\mathrm{\δ}}_i=\underset{i=1}{\overset{n}{\mathrm{\Π}}}{\mathrm{\δ}}_i^{\′}---\left(2\right)$

Described fault element transfer function is:

${\mathrm{\δ}}_t=1-\underset{i=1}{\overset{n}{\mathrm{\Π}}}\left(1-{\mathrm{\δ}}_i^{\′}\right)---\left(3\right)$

Wherein, i is the sequence number of protective relaying device, δ _i' be that protective relaying device protects i with respect to the degree of confidence of element, δ _tBe the confidence level that suspect device breaks down, n is the extension coefficient.

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