CN106786404A - Circuit-breaker failure portection equipment and method under a kind of 3/2nds modes of connection - Google Patents
Circuit-breaker failure portection equipment and method under a kind of 3/2nds modes of connection Download PDFInfo
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- CN106786404A CN106786404A CN201611046053.2A CN201611046053A CN106786404A CN 106786404 A CN106786404 A CN 106786404A CN 201611046053 A CN201611046053 A CN 201611046053A CN 106786404 A CN106786404 A CN 106786404A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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Abstract
The present invention discloses circuit-breaker failure portection equipment and method under a kind of 3/2nds modes of connection; device includes circuit-breaker status acquisition module, circuit breaker trip order acquisition module, current signal collection module, voltage signal acquisition module and breaker failure discrimination module, and the signal that breaker failure discrimination module is collected according to each acquisition module carries out failure differentiation to each breaker in string.Circuit-breaker failure portection equipment of the present invention monitors the related electric quantity information of each breaker in a related trip signal of the interior each breaker of string and division status information, and the string simultaneously, completes each failure protection function of breaker in the string；Judge in the string a certain breaker whether failure when, using circuit breakers state criterion as judge this breaker whether a criterion of failure.The present invention can improve the criterion of failure protection, improve the adaptability of failure protection, and simplify external circuit wiring, reduce device quantity, reduces cost.
Description
Technical field
The present invention relates to breaker fail protection technical field, the breaker under particularly a kind of 3/2nds modes of connection
Based Cb Failure Protection and method.
Background technology
Current 500kV and above Substation Bus Arrangement generally use 3/2 wiring, and its wiring is as shown in Figure of description 1.Two
General between bar bus to form a string by three breakers, referred to as complete string is breaker one such as in figure, breaker two, disconnected
Road device three constitutes a complete string, and breaker four, breaker five, breaker six constitute another complete string.Sometimes two buses
Between form a string by two breakers, referred to as imperfect string, such as breaker seven, breaker eight constitute one it is imperfect
String.The imperfect transition stage for being generally present in transformer substation construction of going here and there.
Two breakers in one complete string near bus are referred to as side breaker, and the breaker not close to bus is referred to as
Breaker.
The equipment such as the transmission line of electricity or transformer drawn between two breakers in one string are referred to as the branch road drawn, and such as scheme
There are 5 branch roads of extraction, respectively circuit one, circuit two, circuit three, main transformer one, main transformer two in 1.
When certain bus in Fig. 1 or certain branch road are short-circuited failure, corresponding protection device sends trip signal, jumps
Corresponding breaker is opened, trouble point is isolated from system（As broken down on circuit one in Fig. 1, the protection device of circuit one
Trip signal can be sent, goes to jump breaker one and breaker two）；If due to operating mechanism failure and other reasons, causing a certain need
Want tripping breaker for a long time cannot tripping, then this breaker be in failure state.
Whether the effect of breaker fail protection, that is, be to judge a certain breaker in failure state, and judging
After going out breaker failure, failure shunt tripping order is sent, remove other related breakers in jump system, realize failure removal.
Breaker failure is divided into three-phase tripping operation two kinds of situations of failure and single-phase tripping operation failure.Single-phase tripping operation failure refers to open circuit
Device receives the trip signal of a certain phase, and this mutually cannot tripping；For example receive A phases trip signal and A phases cannot tripping, then be A
Phase failure；B phases failure, C phases failure are similarly.Three-phase tripping operation failure refers to that breaker receives three-phase trip signal, and at least one
Mutually cannot tripping；For example receive three-phase trip signal and B phases cannot tripping.
The action logic of breaker fail protection is：Protection device detects a certain phase trip signal or three-phase trip signal
Persistently exist and do not return, and the electrical quantity criterion of corresponding failure protection meets, by thinking that breaker loses after the time delay for setting
Spirit（This time delay is more than the maximum time that the normal tripping of breaker needs）, send failure shunt tripping order.Ordered for different tripping operations
Order input, the electrical quantity criterion of failure protection is typically different.The logic of conventional circuit breaker failure protection is illustrated as shown in Figure 3.
Electrical quantity characteristic Design when the electrical quantity criterion of failure protection is according to electric power system fault, generally comprises phase
Electric current criterion, zero sequence current criterion, negative sequence current criterion, low power factor criterion etc..The effect of electrical quantity criterion, is in order to true
Recognize in system faulty generation really and failure does not cut off, prevent from detecting the trip signal that not actually exists and cause failure to be protected
Shield malfunction.
Fig. 2 is configuration and the input and output example of the conventional circuit breaker failure protection under 3/2 mode of connection.Current 3/2 connects
Breaker fail protection is typically configured by breaker under line mode, i.e., each breaker configures a set of based Cb Failure Protection.Fig. 2
Middle breaker fail protection one, breaker fail protection two, breaker fail protection three be respectively breaker one, breaker two,
The based Cb Failure Protection of breaker three.Every based Cb Failure Protection only receives the trip signal related to this TV station breaker and electrically
" breaker fail protection one " only trip signal of access breaker one and the electrical quantity of PT1, CT1 is defeated in amount information, such as Fig. 2
Go out, " breaker fail protection two " only accesses the electrical quantity output of the trip signal and CT2, PT1 of breaker two.
PT1, PT2 are voltage transformer in Fig. 2, and the voltage that the string connects branch road is measured respectively；CT1, CT2, CT3 in Fig. 2
It is current transformer, the electric current that three breakers flow through in the string is measured respectively；In Fig. 2 " bus protection one " for bus one after
Electrical protective device, " bus protection two " is the protective relaying device of bus two, and " route protection " is filled for the relay protection of circuit one
Put, " main transformer protection " is the protective relaying device of main transformer one.
Refer to the jump of the three-phase of the jump breaker one that other protection devices send in Fig. 2 " three jump orders of breaker one "
Lock order；" the sequential trip order of breaker one " refers to the tripping operation life of the jump a certain phase of breaker one that other protection devices send
Order, including A phases trip signal, B phases trip signal, three signals of C phases trip signal.
There are the following problems for breaker fail protection method under current 3/2 mode of connection：
（1）The failure protection criterion of some breaker only uses the electric quantity information of the CT and PT of the breaker direct correlation,
Not using the status information and electric quantity information of other breakers in the string.In fact, circuit breakers failure is jumped in a string
In the presence of certain relevance during lock, it is possible to use division state, current information of circuit breakers etc. as this breaker mistake
One of clever Protection criteria, makes the criterion of failure protection more perfect, causes traditional electrical quantity criterion cannot to act in some situations
When（Such as criterion insufficient sensitivity）, reduce the risk of failure protection tripping；
（2）Lack information sharing between each protection device for circuit breaker, on the one hand repeat external cabling, on the other hand also reduce
Adaptability during external equipment failure.For example, the output voltage of PT1 should access breaker fail protection one in Fig. 2, connect again
Enter breaker fail protection two.If PT1 failures in Fig. 2, breaker fail protection one, the electricity of the input of breaker fail protection two
Pressure information is unavailable, and criterion relevant with voltage in failure electrical quantity criterion needs to exit；Although now PT2 is normal, open circuit
Device failure protection two cannot utilize the output voltage of PT2；
（3）The quantity of circuit-breaker failure portection equipment is more, relatively costly, and floor space is big, and secondary connection is also more complicated.If disconnected
Road device failure protection list set configuration, then each is completely gone here and there needs to configure three based Cb Failure Protections；If breaker fail protection is double
Set configuration, then each is completely gone here and there needs to configure six based Cb Failure Protections.
The content of the invention
The technical problem to be solved in the present invention is：Comprehensive utilization is with each the electric quantity information and state of breaker in a string
Information carries out the differentiation of breaker failure, improves breaker failure criterion, simplifies external circuit wiring, reduces breaker failure and protects
The quantity of protection unit, reduces cost.
The principle of the inventive method is：Monitor each open circuit in a string simultaneously using same circuit-breaker failure portection equipment
The related electric quantity information of each breaker, completes the string in the related trip signal of device and division status information, and the string
The failure condition discrimination of interior each breaker；Judge in the string a certain breaker whether failure when, using circuit breakers
State criterion as judge this breaker whether a kind of criterion of failure.
Above-mentioned circuit breakers state criterion, can be using one of the following two kinds method of discrimination：（1）It is adjacent disconnected when detecting
Road device is in when cut-offfing state, and the criterion meets；When detect circuit breakers be in it is non-cut-off state when, the criterion be discontented with
Foot；（2）State is cut-off when detecting circuit breakers and being in and when this breaker has stream, the criterion meets；It is adjacent when detecting
Breaker be in it is non-cut-off state or this breaker without stream when, the criterion is unsatisfactory for.
Said one string, can be the complete string comprising three breakers, or not complete comprising two breakers
Whole string.
Based on principles above, the technical scheme that the present invention takes is specially：A kind of open circuit under 3/2nds modes of connection
Device based Cb Failure Protection, 3/2nds modes of connection include bus one, and bus two is sequentially connected in series between bus one and bus two
At least two breakers, and between two neighboring breaker draw Xian Lu main transformers, between breaker and bus and
Be respectively equipped with current transformer between circuit breakers, each circuit main transformer be connected to voltage transformer；It is characterized in that, break
Road device based Cb Failure Protection includes：
Circuit-breaker status acquisition module, the division status signal of each breaker in collection string；
Circuit breaker trip order acquisition module, collection protection device send for string in each breaker three jump command signals and
Sequential trip command signal；
Current signal collection module, the output current signal of each current transformer in collection string；
Voltage signal acquisition module, the output voltage signal of each voltage transformer in collection string；
Breaker failure discrimination module, the signal collected according to each acquisition module carries out failure differentiation to each breaker in string.
Device of the invention is the entirety for having gathered all Signals collecting functions and analysis arbitration functions, in application
When, it remove the different signals of collection without being needed according to the differentiation of different breakers, and wiring between device and circuit is more
For succinct.
Further, it is breaker sequence number to define n, and breaker n is any one breaker in a string, and m represents open circuit
A phase in device three-phase, in apparatus of the present invention, when breaker failure discrimination module carries out failure differentiation to breaker：
The failure criterion of three jump failures differentiation is carried out to breaker n includes that circuit breakers refer to criterion R01, i.e.,：Meet and break
At least one breaker has at least one mutually in cut-offfing state in road device n adjacent breaker, or meets breaker n simultaneously extremely
Rare one mutually has electric current；
The failure criterion of failure differentiation is carried out to the m phases of breaker n includes circuit breakers with reference to criterion R02, i.e.,：Meet and break
The m phases of at least one breaker are in and cut-off state in road device n adjacent breaker, or meet the m phases of breaker n simultaneously and have
Electric current；
For breaker n, if there is the input of three-phase trip signal, while meet R01, and more than failure protection time delay, then open circuit
Device n is three jump failures；
M phases for breaker n, if there is trip signal input, while meet R02, and more than failure protection time delay, then open circuit
The m phase failures of device n；
If breaker n is three jump failures or has any phase failure, breaker n failures.
When failure differentiation is carried out to breaker n, the electrical quantity criterion of the alternative breaker n of criterion R01 and criterion R02,
Or make its be with the electrical quantity criterion of breaker n or relation, i.e. when electrical quantity criterion because a variety of causes cannot differentiate
When, can also further realize differentiating the comprehensive failure of breaker n by the differentiation to criterion R01 or R02.
It is specific as follows invention additionally discloses the breaker fail protection method under three kind of 3/2nds mode of connection：
The first, based on foregoing circuit-breaker failure portection equipment, i.e.,：Breaker fail protection method includes：
Gather three jump command signal and sequential trip command signals of each breaker；
Gather the output current signal of each current transformer；
Gather the output voltage signal of each voltage transformer；
Based on the above-mentioned all signals for collecting, failure condition discrimination is carried out to any breaker n, including：
（R1）The differentiation of three jump failures is carried out to breaker n, distinguishing rule includes：
(R11) there is the three-phase trip signal input of breaker n；(R12) the electrical quantity criterion of the three jump failures of breaker n expires
Foot；
If (R11) and (R12) is while meet, and more than failure protection time delay, be then judged as that breaker n jumps failure for three；
（R2）Carry out failure differentiation to each phase m of breaker n, m ∈ { A, B, C }, distinguishing rule includes：
(R21) there is the m phases trip signal input of breaker n；(R22) the m phase failure electrical quantity criterion of breaker n meets；
If (R21) and (R22) is while meet, and more than failure protection time delay, be then judged as the m phase failures of breaker n；
If there is any one to differentiate that result is failure in the differentiation that R1 and R2 is carried out, it is judged as breaker n failures.
It is for second：Breaker fail protection method under 3/2nds modes of connection is sentenced using circuit breakers state
According to specifically including：
Gather the division status signal of each breaker；
Gather three jump command signal and sequential trip command signals of each breaker；
Gather the output current signal of each current transformer；
Gather the output voltage signal of each voltage transformer；
Based on the above-mentioned all signals for collecting, failure condition discrimination is carried out to any breaker n, including：
（R1）The differentiation of three jump failures is carried out to breaker n, distinguishing rule includes：
(R11) there is the three-phase trip signal input of breaker n；(R12) the electrical quantity criterion of the three jump failures of breaker n expires
Foot；(R13) at least one breaker has at least one mutually in cut-offfing state in the breaker adjacent with breaker n；
If (R11) meets, while thering is any one criterion to meet in (R12) and (R13), and more than failure protection time delay, then sentence
Break as breaker n is three jump failures；
（R2）Carry out failure differentiation to each phase m of breaker n, m ∈ { A, B, C }, distinguishing rule includes：
(R21) there is the m phases trip signal input of breaker n；(R22) the m phase failure electrical quantity criterion of breaker n meets；
(R23) in the breaker adjacent with breaker n at least one breaker m phases be in cut-off state；
If (R21) meets, while thering is any one criterion to meet in (R22) and (R23), and more than failure protection time delay, then sentence
It is the m phase failures of breaker n to break；
If there is any one to differentiate that result is failure in the differentiation that R1 and R2 is carried out, it is judged as breaker n failures.
The third is：Breaker fail protection method under 3/2nds modes of connection is also sentenced using circuit breakers state
According to, including：
Gather the division status signal of each breaker；
Gather three jump command signal and sequential trip command signals of each breaker；
Gather the output current signal of each current transformer；
Gather the output voltage signal of each voltage transformer；
Based on the above-mentioned all signals for collecting, failure condition discrimination is carried out to any breaker n, including：
（R1）The differentiation of three jump failures is carried out to breaker n, distinguishing rule includes：
(R11) there is the three-phase trip signal input of breaker n；(R12) the electrical quantity criterion of the three jump failures of breaker n expires
Foot；(R13) at least one breaker has at least one mutually in cut-offfing state in the breaker adjacent with breaker n；(R14)
Breaker n at least one mutually has electric current；
If (R11), (R13) and (R14) are while meet, or (R11) and (R12) is while meet, and prolong more than failure protection
When, then it is judged as that breaker n jumps failure for three；
（R2）Carry out failure differentiation to each phase m of breaker n, m ∈ { A, B, C }, distinguishing rule includes：
(R21) there is the m phases trip signal input of breaker n；(R22) the m phase failure electrical quantity criterion of breaker n meets；
(R23) in the breaker adjacent with breaker n at least one breaker m phases be in cut-off state；(R24) breaker n
M phases have electric current；
If (R21) and (R22) are while meet, or (R21), (R23) and (R24) is while satisfaction, and more than failure protection time delay, then
It is judged as the m phase failures of breaker n；
If（R1）With（R2）There is any one to differentiate that result is failure in the differentiation for carrying out, be then judged as breaker n failures.
In apparatus of the present invention and method, the related trip signal of each breaker and division status information in a string are
Refer to and touched for the tripping interior each trip signal of breaker of this string, and each breaker auxiliary by what other protection devices sent
Information of the expression breaker of point output in minute position state or conjunction position state.The related electrical quantity letter of each breaker in string
Breath, refers to each current information of breaker in the string, each information of voltage for drawing branch road of the string etc..When one string in be comprising
Three complete strings of breaker, when the voltage transformer of two branch roads exports normal in the string, middle breaker has with voltage
The failure electrical quantity criterion of pass is calculated using the output voltage of above-mentioned any one voltage transformer；When detecting above-mentioned two
When individual voltage transformer has one to break down, the middle breaker failure electrical quantity criterion relevant with voltage is using trouble-free
The output voltage of voltage transformer is calculated.Detect circuit breakers and be in and cut-off state, refer to detect adjacent open circuit
Device is in point position state and flows through the threshold of the electric current less than setting of the circuit breakers；The above-mentioned circuit breakers that detect are in
It is non-to cut-off state, refer to detect circuit breakers to be in conjunction position state or flow through the electric current of the circuit breakers not less than setting
Threshold, the setting of electric current threshold carries out based on experience value.
Beneficial effect
The present invention differentiate in the next string of 3/2nds modes of connection a certain breaker whether failure when, except utilizing this open circuit
Outside the electric quantity information of device, also introduce using the status information and electric quantity information of circuit breakers, the criterion of failure protection is more
Add it is kind, when reducing that traditional failure electrical quantity criterion cannot meet caused by some situations, the possibility of failure protection tripping.And
The electric quantity information in a string that circuit-breaker failure portection equipment of the present invention is obtained more comprehensively, can improve protection device at some
Adaptability when electric quantity information is abnormal；The quantity of based Cb Failure Protection is reduced, simplifies wiring, reduced floor space and reduce into
This.
Brief description of the drawings
Fig. 1 is 3/2 mode of connection schematic diagram；
Fig. 2 is the configuration schematic diagram of conventional circuit breaker failure protection under 3/2 mode of connection；
Fig. 3 is the input and output schematic diagram of conventional circuit breaker failure protection under 3/2 mode of connection；
Fig. 4 is the logical schematic of conventional circuit breaker failure protection；
Fig. 5 is breaker fail protection configuration schematic diagram of the invention under 3/2 mode of connection；
Fig. 6 is breaker fail protection input and output schematic diagram of the invention under 3/2 mode of connection；
Fig. 7 is the specific embodiment schematic diagram of the first breaker fail protection method of the invention；
Fig. 8 is the specific embodiment schematic diagram of second breaker fail protection method of the invention；
Fig. 9 is the specific embodiment schematic diagram of the third breaker fail protection method of the invention.
Specific embodiment
Further described below in conjunction with the drawings and specific embodiments.
The present invention improves breaker and loses under 3/2 mode of connection using the status information and electric quantity information of circuit breakers
Clever criterion, and by increase information sharing lifted external equipment failure when failure protection adaptability, while reaching reduction equipment
The effect of quantity, reduces cost and reduction external loop wiring.Based on above thinking, the present invention is proposed under 3/2nds modes of connection
Circuit-breaker failure portection equipment and method.
Apparatus of the present invention are：Circuit-breaker failure portection equipment monitors each open circuit in the next string of 3/2 mode of connection simultaneously
The related trip signal of device, and the related electric quantity information of each breaker in the string, complete in the string each breaker
Failure condition discrimination；Judge in the string a certain breaker whether failure when, using circuit breakers state criterion as sentencing
Break this breaker whether a kind of criterion of failure.
Specifically, circuit-breaker failure portection equipment includes：
Circuit-breaker status acquisition module, the division status signal of each breaker in collection string；
Circuit breaker trip order acquisition module, collection protection device send for string in each breaker three jump command signals and
Sequential trip command signal；
Current signal collection module, the output current signal of each current transformer in collection string；
Voltage signal acquisition module, the output voltage signal of each voltage transformer in collection string；
Breaker failure discrimination module, the signal collected according to each acquisition module carries out failure differentiation to each breaker in string.
Breaker failure discrimination module is when failure differentiation is carried out to breaker：
The failure criterion of three jump failures differentiation is carried out to breaker n includes that circuit breakers refer to criterion R01, i.e.,：Meet and break
At least one breaker has at least one mutually in cut-offfing state in road device n adjacent breaker, or meets breaker n simultaneously extremely
Rare one mutually has electric current；
The failure criterion of failure differentiation is carried out to the m phases of breaker n includes circuit breakers with reference to criterion R02, i.e.,：Meet and break
The m phases of at least one breaker are in and cut-off state in road device n adjacent breaker, or meet the m phases of breaker n simultaneously and have
Electric current；
For breaker n, if there is the input of three-phase trip signal, while meet R01, and more than failure protection time delay, then open circuit
Device n is three jump failures；
M phases for breaker n, if there is trip signal input, while meet R02, and more than failure protection time delay, then open circuit
The m phase failures of device n；
If breaker n is three jump failures or has any phase failure, breaker n failures.
When failure differentiation is carried out to breaker n, the electrical quantity criterion of the alternative breaker n of criterion R01 and criterion R02,
Or make its be with the electrical quantity criterion of breaker n or relation, i.e. when electrical quantity criterion because a variety of causes cannot differentiate
When, can also further realize differentiating the comprehensive failure of breaker n by the differentiation to criterion R01 or R02.
Embodiment one
With reference to shown in Fig. 5 and Fig. 6, in Fig. 5 in a complete string three breakers respective three jump order, sequential trip order,
Division state accesses a circuit-breaker failure portection equipment, and three the electric current outputs of CT, the voltage outputs of two PT connect
Enter circuit-breaker failure portection equipment.In Fig. 5, for breaker one or breaker three, its circuit breakers is breaker two；For
Breaker two, its circuit breakers are breaker one and breaker three.
Device of the invention is the entirety for having gathered all Signals collecting functions and analysis arbitration functions, in application
When, it remove the different signals of collection without being needed according to the differentiation of different breakers, and wiring between device and circuit is more
For succinct.
Breaker fail protection method is divided into three kinds under 3/2nds modes of connection of the invention, described separately below.
Embodiment two
With reference to shown in Fig. 7, in the example, the input/output signal of breaker fail protection is carried out still according to Fig. 6, but breaking
The criterion of device failure is only with traditional failure protection electrical quantity criterion.This implementation method compared with traditional failure protection,
Failure criterion does not have a difference, but is the reduction of the quantity of desired signal harvester, reduces cost.
When breaker two is in conjunction position state in Fig. 5, PT1 output voltages are equal with PT2 output voltages, and breaker two loses
The low power factor criterion of spirit protection can use any of which group voltage, it is assumed that using the voltage of PT1 outputs.When detecting PT1
During generation disconnection fault, circuit-breaker failure portection equipment can be automatically switched to using the voltage output of PT2.As long as PT1 or PT2 have
One normal, and the low power factor criterion of breaker two avoids the need for exiting, so as to improve the adaptability of failure protection.
The breaker fail protection method based on circuit breakers with reference to criterion thought will be illustrated below, that is, implemented
Example three and example IV.
Embodiment three
It is second breaker fail protection method of the invention with reference to shown in Fig. 8.Lost for a certain single-phase tripping operation of breaker
When spirit is judged, when the corresponding phase of circuit breakers is in cut-offs state, it is believed that circuit breakers meet with reference to criterion；It is right
When a certain breaker three-phase tripping operation failure is judged, when circuit breakers at least are mutually in cut-offs state, recognize
For circuit breakers meet with reference to criterion.
Above-mentioned a certain phase be in " cut-offfing state ", refer to breaker this mutually in point position state and flow through the phase electric current it is small
In the electric current threshold of setting.Refer to that the A phases of breaker two are in point for example, in Fig. 8 " the A phases of breaker two are in and cut-off state "
Position state, and flow through the electric current threshold of the electric current less than setting of the A phases of breaker two.
Example IV
It is the third breaker fail protection method of the invention with reference to shown in Fig. 9.Lost for a certain single-phase tripping operation of breaker
When spirit is judged, when the corresponding phase of circuit breakers be in cut-off state and this breaker this mutually have stream when, it is believed that it is adjacent disconnected
Road device meets with reference to criterion；When judging for a certain breaker three-phase tripping operation failure, when circuit breakers at least
When mutually mutually having stream in state of cut-offfing, and this breaker at least, it is believed that circuit breakers meet with reference to criterion.
Compared with example IV, the condition that circuit breakers state criterion meets increased this breaker stream to embodiment three
Condition, this can reduce the risk of failure protection malfunction." having stream " in Fig. 9, refers to that electric current is more than a threshold for very little,
This threshold typically fetches protection the minimum exact working current of measurement.
The application examples of embodiment three
By taking there is ground short circuit failure in the A phases of circuit in Fig. 5 one as an example, the method for discrimination of failure protection shown in explanatory diagram 7.For convenience
Explanation, it is assumed that the conventional electrical amount criterion of the single-phase tripping operation failure of breaker only includes phase current criterion, that is, the phase of the phase that trips in figure
When electric current is more than setting threshold, failure protection electrical quantity criterion meets；Otherwise then it is unsatisfactory for.Divide the non-failure of breaker and mistake below
Clever two kinds of situations are illustrated respectively.
（1）The situation of the non-failure of breaker.There is ground short circuit failure in the A phases of circuit one, route protection is to the A phases of breaker one
Trip signal is sent with the A phases of breaker two, this trip signal lasts till that failure is removed, and circuit-breaker failure portection equipment is also detected
" the A phases trip signal of breaker one ", " the A phases trip signal of breaker two " in this trip signal, i.e. Fig. 5；The He of breaker one
Breaker two receives normal tripping after trip signal, and A phase currents are reduced to close to zero, and the trip signal that route protection sends is quickly
Return, the duration will not act less than failure protection time delay in Fig. 5, the logic according to Fig. 5, failure protection.
（2）The situation of the A phase failures of breaker one.There is ground short circuit failure in the A phases of circuit one, line protective devices are to open circuit
The A phases of device one send trip signal with the A phases of breaker two, and circuit-breaker failure portection equipment also detects that this trip signal；Breaker
Two normal trippings, the non-tripping of A phases of breaker one；Route protection does not cut off because detecting failure, and it sends trip signal and persistently deposits
In " the A phases trip signal of breaker one ", " the A phases trip signal of breaker two " persistently presence in i.e. Fig. 5；The A phase trippings of breaker two
Afterwards, A phase currents are reduced to zero, and less than the threshold of failure phase current criterion, the failure electrical quantity criterion of breaker two is unsatisfactory for；Together
When detect breaker one A phases be in it is non-cut-off state, therefore the circuit breakers state criterion of breaker two is also unsatisfactory for.
The non-tripping of A phases of breaker one, fault current flows continuously through the A phases of breaker one, if this electric current is more than the door of phase current criterion
Sill, then meet traditional failure electrical quantity criterion, and the failure protection of breaker one can be with correct operation, this and traditional failure protection
Action logic is identical；Cause phase current criterion sensitivity not enough if fault current is smaller, now conventional electrical amount criterion can not expire
Foot, but detect breaker two A phases be in cut-off state, the logic according to Fig. 5, the circuit breakers of the A phases of breaker one
State criterion meets, and the failure protection of breaker one being capable of correct operation.After the failure protection action tripping operation of breaker one, tripping system
Other related breakers, make failure removal, route protection withdraw trip signal after detecting failure removal in system.
Logical AND Fig. 8 of Fig. 9 is similar to, and difference is that circuit breakers state criterion increased this breaker and have stream condition,
Fig. 9 logics are no longer illustrated.
To sum up, the present invention is by each the trip signal of breaker correlation, division state and electricity in one string of real-time monitoring
Tolerance information, with reference to logic judgment, can complete each failure of breaker in a string and differentiate；Breaker fail protection is being sentenced
Not a certain breaker whether failure when, in addition to using the electric quantity information of this breaker, also using the shape of circuit breakers
State information and electric quantity information, the criterion of failure protection are more perfect, and reducing some situations causes traditional failure electrical quantity criterion
The possibility of failure protection tripping when cannot act；Breaker fail protection obtain one string in electric quantity information more comprehensively,
Improve adaptability of the protection device when some electric quantity informations are abnormal；The quantity of based Cb Failure Protection is reduced, simplifies wiring, subtracted
Few floor space and reduces cost.
Above example is only explanation technological thought of the invention, it is impossible to limit protection scope of the present invention with this, every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme each falls within the scope of the present invention
Within.
Claims (5)
1. the circuit-breaker failure portection equipment under the mode of connection of one kind 3/2nds, 3/2nds modes of connection include bus one,
Bus two, is sequentially connected in series at least two breakers between bus one and bus two, and between two neighboring breaker
The circuit of extraction main transformer, be respectively equipped with current transformer between breaker and bus and between circuit breakers, each circuit
Main transformer is connected to voltage transformer；It is characterized in that, circuit-breaker failure portection equipment includes：
Circuit-breaker status acquisition module, the division status signal of each breaker in collection string；
Circuit breaker trip order acquisition module, collection protection device send for string in each breaker three jump command signals and
Sequential trip command signal；
Current signal collection module, the output current signal of each current transformer in collection string；
Voltage signal acquisition module, the output voltage signal of each voltage transformer in collection string；
Breaker failure discrimination module, the signal collected according to each acquisition module carries out failure differentiation to each breaker in string.
2. the circuit-breaker failure portection equipment under 3/2nds mode of connection according to claim 1, it is characterized in that, open circuit
When device failure discrimination module carries out failure differentiation to breaker：
The failure criterion of three jump failures differentiation is carried out to breaker n includes that circuit breakers refer to criterion R01, i.e.,：Meet and break
At least one breaker has at least one mutually in cut-offfing state in road device n adjacent breaker, or meets breaker n simultaneously extremely
Rare one mutually has electric current；
The failure criterion of failure differentiation is carried out to the m phases of breaker n includes circuit breakers with reference to criterion R02, i.e.,：Meet and break
The m phases of at least one breaker are in and cut-off state in road device n adjacent breaker, or meet the m phases of breaker n simultaneously and have
Electric current；
For breaker n, if there is the input of three-phase trip signal, while meet R01, and more than failure protection time delay, then open circuit
Device n is three jump failures；
M phases for breaker n, if there is trip signal input, while meet R02, and more than failure protection time delay, then open circuit
The m phase failures of device n；
If breaker n is three jump failures or has any phase failure, breaker n failures.
3. a kind of breaker of the circuit-breaker failure portection equipment under 3/2nds modes of connection based on described in claim 1 loses
Clever guard method, it is characterized in that, including：
Gather three jump command signal and sequential trip command signals of each breaker；
Gather the output current signal of each current transformer；
Gather the output voltage signal of each voltage transformer；
Based on the above-mentioned all signals for collecting, failure condition discrimination is carried out to any breaker n, including：
（R1）The differentiation of three jump failures is carried out to breaker n, distinguishing rule includes：
(R11) there is the three-phase trip signal input of breaker n；(R12) the electrical quantity criterion of the three jump failures of breaker n expires
Foot；
If (R11) and (R12) is while meet, and more than failure protection time delay, be then judged as that breaker n jumps failure for three；
（R2）Carry out failure differentiation to each phase m of breaker n, m ∈ { A, B, C }, distinguishing rule includes：
(R21) there is the m phases trip signal input of breaker n；(R22) the m phase failure electrical quantity criterion of breaker n meets；
If (R21) and (R22) is while meet, and more than failure protection time delay, be then judged as the m phase failures of breaker n；
If there is any one to differentiate that result is failure in the differentiation that R1 and R2 is carried out, it is judged as breaker n failures.
4. the breaker fail protection method under the mode of connection of one kind 3/2nds, it is characterized in that, including：
Gather the division status signal of each breaker；
Gather three jump command signal and sequential trip command signals of each breaker；
Gather the output current signal of each current transformer；
Gather the output voltage signal of each voltage transformer；
Based on the above-mentioned all signals for collecting, failure condition discrimination is carried out to any breaker n, including：
（R1）The differentiation of three jump failures is carried out to breaker n, distinguishing rule includes：
(R11) there is the three-phase trip signal input of breaker n；(R12) the electrical quantity criterion of the three jump failures of breaker n expires
Foot；(R13) at least one breaker has at least one mutually in cut-offfing state in the breaker adjacent with breaker n；
If (R11) meets, while thering is any one criterion to meet in (R12) and (R13), and more than failure protection time delay, then sentence
Break as breaker n is three jump failures；
（R2）Carry out failure differentiation to each phase m of breaker n, m ∈ { A, B, C }, distinguishing rule includes：
(R21) there is the m phases trip signal input of breaker n；(R22) the m phase failure electrical quantity criterion of breaker n meets；
(R23) in the breaker adjacent with breaker n at least one breaker m phases be in cut-off state；
If (R21) meets, while thering is any one criterion to meet in (R22) and (R23), and more than failure protection time delay, then sentence
It is the m phase failures of breaker n to break；
If there is any one to differentiate that result is failure in the differentiation that R1 and R2 is carried out, it is judged as breaker n failures.
5. the breaker fail protection method under the mode of connection of one kind 3/2nds, it is characterized in that, including：
Gather the division status signal of each breaker；
Gather three jump command signal and sequential trip command signals of each breaker；
Gather the output current signal of each current transformer；
Gather the output voltage signal of each voltage transformer；
Based on the above-mentioned all signals for collecting, failure condition discrimination is carried out to any breaker n, including：
（R1）The differentiation of three jump failures is carried out to breaker n, distinguishing rule includes：
(R11) there is the three-phase trip signal input of breaker n；(R12) the electrical quantity criterion of the three jump failures of breaker n expires
Foot；(R13) at least one breaker has at least one mutually in cut-offfing state in the breaker adjacent with breaker n；(R14)
Breaker n at least one mutually has electric current；
If (R11), (R13) and (R14) are while meet, or (R11) and (R12) is while meet, and prolong more than failure protection
When, then it is judged as that breaker n jumps failure for three；
（R2）Carry out failure differentiation to each phase m of breaker n, m ∈ { A, B, C }, distinguishing rule includes：
(R21) there is the m phases trip signal input of breaker n；(R22) the m phase failure electrical quantity criterion of breaker n meets；
(R23) in the breaker adjacent with breaker n at least one breaker m phases be in cut-off state；(R24) breaker n
M phases have electric current；
If (R21) and (R22) are while meet, or (R21), (R23) and (R24) is while satisfaction, and more than failure protection time delay, then
It is judged as the m phase failures of breaker n；
If（R1）With（R2）There is any one to differentiate that result is failure in the differentiation for carrying out, be then judged as breaker n failures.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110445104A (en) * | 2019-07-26 | 2019-11-12 | 许继集团有限公司 | A kind of station domain failure protection method and device |
| CN111641193A (en) * | 2020-05-19 | 2020-09-08 | 国网河南省电力公司电力科学研究院 | Self-adaptive double-bus failure protection method and device |
| CN113036732A (en) * | 2021-05-08 | 2021-06-25 | 国网江苏省电力有限公司镇江供电分公司 | 220kV inner bridge connection transformer substation circuit breaker failure protection relay protection method |
| CN114062994A (en) * | 2021-11-08 | 2022-02-18 | 许昌许继软件技术有限公司 | Current transformer saturation judging method and device suitable for 3/2 wiring line |
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| CN202712819U (en) * | 2012-09-06 | 2013-01-30 | 韶关市擎能设计有限公司 | Protection system capable of realizing breaker failure triggering relevant trips of interconnecting transformer |
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| CN106129971A (en) * | 2016-08-12 | 2016-11-16 | 许继集团有限公司 | A kind of busbar protective device chopper dual failure fault partition method and system |
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| CN202712819U (en) * | 2012-09-06 | 2013-01-30 | 韶关市擎能设计有限公司 | Protection system capable of realizing breaker failure triggering relevant trips of interconnecting transformer |
| CN103683228A (en) * | 2013-12-12 | 2014-03-26 | 南京南瑞继保电气有限公司 | Control method of breaker failure protection and automatic reclosing device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110445104A (en) * | 2019-07-26 | 2019-11-12 | 许继集团有限公司 | A kind of station domain failure protection method and device |
| CN111641193A (en) * | 2020-05-19 | 2020-09-08 | 国网河南省电力公司电力科学研究院 | Self-adaptive double-bus failure protection method and device |
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| CN113036732A (en) * | 2021-05-08 | 2021-06-25 | 国网江苏省电力有限公司镇江供电分公司 | 220kV inner bridge connection transformer substation circuit breaker failure protection relay protection method |
| CN113036732B (en) * | 2021-05-08 | 2022-07-08 | 国网江苏省电力有限公司镇江供电分公司 | 220kV inner bridge connection transformer substation circuit breaker failure protection relay protection method |
| CN114062994A (en) * | 2021-11-08 | 2022-02-18 | 许昌许继软件技术有限公司 | Current transformer saturation judging method and device suitable for 3/2 wiring line |
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