CN109655681A - A kind of substation and switchyard double measurement circuit method for detecting abnormality and system - Google Patents
A kind of substation and switchyard double measurement circuit method for detecting abnormality and system Download PDFInfo
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- CN109655681A CN109655681A CN201811274001.XA CN201811274001A CN109655681A CN 109655681 A CN109655681 A CN 109655681A CN 201811274001 A CN201811274001 A CN 201811274001A CN 109655681 A CN109655681 A CN 109655681A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Supply And Distribution Of Alternating Current (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to a kind of substation and switchyard double measurement circuit method for detecting abnormality and systems, the described method includes: the corresponding terminal device of bus upper switch is calibrated, and obtain the three-phase voltage of the corresponding terminal device of switch marked with having time, using the three-phase voltage of the corresponding terminal device of switch with same time label to bus, the voltage transformer secondary measurement circuit of bus upper switch and the Current Transformer Secondary measurement circuit of bus upper switch carry out abnormality detection, the double measurement abnormal conditions of substation and switchyard can be quickly detected by adopting the above technical scheme, effectively improve detection sensitivity.
Description
Technical field
The present invention relates to electric system abnormality detection fields, and in particular to a kind of substation and switchyard double measurement circuit
Method for detecting abnormality and system.
Background technique
The number of switches of each section of bus inlet-outlet line in substation and switchyard is more, voltage, the electric current of each switch
Transformer secondary circuit wiring is complicated, and intermediate link is also relatively more, if the different of switch double measurement circuit cannot be detected in time
Often, it will lead to some transformer secondary circuit phase sequence wrong, polarity is reversed, the terminal device data acquisition of broken string or place switch
There is the problems such as abnormal in system, influences the normal safe operation of network system；
In existing technology, the method monitored extremely for voltage, the secondary loop of mutual inductor of each switch,
Including using killer switch installation secondary terminals equipment the operating status of the primary equipment of electric system is monitored or
The technological means that person is noted abnormalities by detection PT, CT broken string, but there is under-sensitive in these technological means.
Summary of the invention
The present invention provides a kind of substation and switchyard double measurement circuit method for detecting abnormality and system, and the purpose is to right
After the corresponding terminal device of bus upper switch is calibrated, the three-phase of the corresponding terminal device of switch marked with having time is utilized
The Current Transformer Secondary that voltage measures circuit and bus upper switch to the voltage transformer secondary of bus, bus upper switch measures
Abnormality detection in high sensitivity is realized in circuit, ensures the normal safe operation of network system.
The purpose of the present invention is adopt the following technical solutions realization:
A kind of substation and switchyard double measurement circuit method for detecting abnormality, it is improved in that the method packet
It includes:
The corresponding terminal device of bus upper switch is calibrated, and obtains the corresponding terminal of switch marked with having time
The three-phase voltage of equipment；
Using the three-phase voltage of the corresponding terminal device of switch with same time label to bus, bus upper switch
Voltage transformer secondary measurement circuit and the Current Transformer Secondary measurement circuit of bus upper switch carry out abnormality detection.
It is preferably, described that the corresponding terminal device of bus upper switch is calibrated, comprising:
Each terminal device is calibrated according to preset time interval according to the time of time source, until each terminal is set
Standby time error, which is respectively less than, is equal to 10ms.
Preferably, the three-phase voltage using the corresponding terminal device of switch with same time label to bus,
The voltage transformer secondary measurement circuit of bus upper switch and the Current Transformer Secondary measurement circuit of bus upper switch carry out different
Often detection, comprising:
Bus is carried out abnormality detection according to the three-phase voltage with same time marked terminal equipment；
Abnormal inspection is carried out according to voltage transformer secondary measurement circuit of the abnormality detection result of bus to bus upper switch
It surveys；
The Current Transformer Secondary of the abnormality detection result to switch in circuit is measured according to the voltage transformer secondary of switch
Measurement circuit carries out abnormality detection.
Further, three-phase voltage of the basis with same time marked terminal equipment carries out abnormal inspection to bus
It surveys, comprising:
If a phase voltage of bus upper switch i terminal device corresponding with switch j is all larger than Un* 90% and meet U (i)-U
(j) < Un* 5%, then bus is normal charging operation state, otherwise bus is abnormality；
Wherein, U (i) is a phase voltage of the corresponding terminal device of bus upper switch i, and U (j) is corresponding for bus upper switch j
Terminal device a phase voltage, i ≠ j, UnFor the voltage rating of bus.
Further, the abnormality detection result according to bus measures back the voltage transformer secondary of bus upper switch
Road carries out abnormality detection, comprising:
When bus is normal charging operation state, judge that the three-phase voltage of the corresponding terminal device of switch on bus is
It is no to be less than Um* 95%, if so, the voltage transformer secondary measurement circuit of the switch is abnormality, opened if it is not, then obtaining this
The negative sequence component value of the three-phase voltage of corresponding terminal device is closed, and judges whether it is greater than Um* 5%, if so, the switch
It is abnormality that voltage transformer secondary, which measures circuit,；If it is not, then the voltage transformer secondary measurement circuit of the switch is normal
State；Wherein, UmFor busbar voltage；
When bus is abnormality, termination detection operation.
Further, busbar voltage U is determined as the following formulam:
Um=(U (i) a+U (i) b+U (i) c+U (j) a+U (j) b+U (j) c)/6
Wherein, U (i) a is a phase voltage of the corresponding equipment of i-th of switch on bus, and U (i) b is i-th of switch on bus
The b phase voltage of corresponding equipment, U (i) c are the c phase voltage of i-th of the corresponding equipment of switch on bus, and U (j) a is the on bus
The a phase voltage of the corresponding equipment of j switch, U (j) b are the b phase voltage of the corresponding equipment of j-th of switch on bus, and U (j) c is
The c phase voltage of the corresponding equipment of j-th of switch on bus.
Preferably, the electric current of the abnormality detection result to switch that circuit is measured according to the voltage transformer secondary of switch
Mutual inductor double measurement circuit carries out abnormality detection, comprising:
If the voltage transformer secondary measurement circuit of switch is normal condition, according to the operating power and braking work of bus
Rate carries out abnormality detection the Current Transformer Secondary measurement circuit of switch；
Otherwise, termination detection.
Further, described that the Current Transformer Secondary of switch is measured back according to the operating power and braking power of bus
Road carries out abnormality detection, comprising:
If a. operating power of bus | ∑ P | it is greater than P0And meet and be greater than K* ∑ | P |, then step b is gone to, inspection is otherwise terminated
It surveys；
If b. the maximum switch of power variation meets in the detection switch set | Δ P (max) |/P (max) >
20%, then the secondary loop of mutual inductor of the switch of bus is abnormality, otherwise the current transformer two of the switch of bus
Minor loop is normal condition, termination detection；
The power variation Δ P (i) of i-th of switch in the detection switch set is calculated as follows；
Δ P (i)=P (i) '-P (i)
Wherein, K is ratio brake coefficient, K ∈ (0,1), P0For the startup power value of unbalanced power；P (i) ' is i-th
Switch is in the power of unbalanced power state, and P (i) is the power that i-th of switch is in power-balance state, and Δ P (max) is
The corresponding power variation of the maximum switch of power variation, P (max) are that the maximum switch of power variation is in power-balance
The power of state.
Further, the operating power of bus is determined as the following formula | ∑ P |:
| ∑ P |=| ∑ PRing+∑PFeedback|；
Wherein, ∑ PRing=P (1)+P (2)+...+P (k), ∑ PFeedback=P (k+1)+P (k+2)+...+P (k+s), ∑ PRingFor ring
Into ring go out the power switched and, P (k) is that k-th ring goes out the power switched into ring, and k is that ring goes out the quantity switched into ring on bus,
∑PFeedbackFor feeder switch power and, P (k+s) be s-th of feeder switch power, s be bus on feeder switch quantity；
The braking power ∑ of bus is determined as the following formula | P |:
∑ | P |=min (∑ | PRing|,∑|PFeedback|)
Wherein, ∑ | PRing|=| P (1) |+| P (2) |+...+| P (k) |, ∑ | PFeedback|=| P (k+1) |+| P (k+2) |+...+|
P (k+s) |, ∑ | PRing| go out switching components into ring for the ring of braking power, ∑ | PFeedback| it is the feeder switch component of braking power.
A kind of substation and switchyard double measurement circuit abnormality detection system, it is improved in that the system packet
It includes:
Module is obtained, for the corresponding terminal device of bus upper switch to be calibrated, and obtains and is marked with having time
Switch the three-phase voltage of corresponding terminal device；
Detection module, for the three-phase voltage using the corresponding terminal device of switch with same time label to mother
The Current Transformer Secondary measurement circuit of line, the voltage transformer secondary measurement circuit of bus upper switch and bus upper switch carries out
Abnormality detection.
Compared with the immediate prior art, the present invention is also had the following beneficial effects:
Using technical solution of the present invention, obtains and have again after the corresponding terminal device of bus upper switch is calibrated
The three-phase voltage of the corresponding terminal device of switch of time label be used for after abnormality detection, guarantee the time synchronization of equipment
Property, improve the accuracy of detection；And then utilize the three-phase voltage of the corresponding terminal device of switch with same time label
The Current Transformer Secondary for measuring circuit and bus upper switch to the voltage transformer secondary of bus, bus upper switch measures circuit
It carries out abnormality detection, can fast and effeciently position the position occurred extremely, improve the reliability and sensitivity of abnormality detection, drop
Low power grid abnormal wear and the stable operation for facilitating power grid.
Detailed description of the invention
Fig. 1 is the flow chart of substation of the embodiment of the present invention and switchyard double measurement circuit method for detecting abnormality；
Fig. 2 is the power acting characteristic of substation of the embodiment of the present invention and switchyard double measurement circuit method for detecting abnormality
Curve graph figure；
Fig. 3 is the structural schematic diagram of substation of the embodiment of the present invention and switchyard double measurement circuit abnormality detection system；
Fig. 4 is the electric system switch of substation of the embodiment of the present invention and switchyard double measurement circuit method for detecting abnormality
It stands single busbar form main wiring diagram；
Specific embodiment
It elaborates with reference to the accompanying drawing to a specific embodiment of the invention.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides a kind of substation and switchyard double measurement circuit method for detecting abnormality and systems, carry out below
Explanation.
Fig. 1 shows the process of substation and switchyard double measurement circuit method for detecting abnormality in the embodiment of the present invention
Figure, as shown in Figure 1, the method may include:
101. pair corresponding terminal device of bus upper switch is calibrated, and it is corresponding to obtain the switch marked with having time
The three-phase voltage of terminal device；
102. three-phase voltage using the corresponding terminal device of switch with same time label on bus, bus to opening
The voltage transformer secondary measurement circuit of pass and the Current Transformer Secondary measurement circuit of bus upper switch carry out abnormality detection.Root
According to setting school when mode select a clock, as the time source of standard, and it is primary to set section starting at every fixed time
Task when school, the work of each terminal device deadline calibration；
Wherein, described that the corresponding terminal device of bus upper switch is calibrated, may include:
Each terminal device is calibrated according to preset time interval according to the time of time source, until each terminal is set
Standby time error, which is respectively less than, is equal to 10ms；
Specifically, the order for collecting all terminal device current times is sent by maintenance work station, each terminal device connects
After receiving the order, the current equipment time is replied, then, maintenance work station is collected the time that all terminal devices are replied, and
It is compared to each other, if error is greater than 10ms, when re-starting school, is completed when requirement of the satisfaction less than 10ms, school；
The time of each terminal device, each terminal device was under the time interval of unified setting in the state of being mutually in step
Start calculating task, calculates the three-phase voltage of each terminal device and the real and imaginary parts of three-phase current, wherein terminal device
The real part of three-phase voltage and three-phase current is denoted as Uar, Ubr, Ucr, Iar, Ibr, Icr, the three-phase voltage and three-phase of terminal device
The imaginary part of electric current is denoted as: Uax, Ubx, Ucx, Iax, Ibx, Icx, and calculates serial number N according to label at the time of calculating, then, will
Serial number N is calculated, three-phase voltage, the real part of three-phase current, imaginary part is sent to maintenance work station, by maintenance work station by all devices
The three-phase voltage of same calculating serial number N be stored in together with the real part of three-phase current, imaginary part, can guarantee same serial number in this way
Data, the data of discontinuity surface when as same.
The three-phase voltage using the corresponding terminal device of switch with same time label on bus, bus to opening
The voltage transformer secondary measurement circuit of pass and the Current Transformer Secondary measurement circuit of bus upper switch carry out abnormality detection, can
To include:
Bus is carried out abnormality detection according to the three-phase voltage with same time marked terminal equipment；
Abnormal inspection is carried out according to voltage transformer secondary measurement circuit of the abnormality detection result of bus to bus upper switch
It surveys；
The Current Transformer Secondary of the abnormality detection result to switch in circuit is measured according to the voltage transformer secondary of switch
Measurement circuit carries out abnormality detection.
Specifically, three-phase voltage of the basis with same time marked terminal equipment carries out abnormal inspection to bus
It surveys, may include:
If a phase voltage of bus upper switch i terminal device corresponding with switch j is all larger than Un* 90% and meet U (i)-U
(j) < Un* 5%, then bus is normal charging operation state, otherwise bus is abnormality；
Wherein, U (i) is a phase voltage of the corresponding terminal device of bus upper switch i, and U (j) is corresponding for bus upper switch j
Terminal device a phase voltage, i ≠ j, UnFor the voltage rating of bus.
The abnormality detection result according to bus carries out the voltage transformer secondary measurement circuit of bus upper switch different
It often detects, may include:
When bus is normal charging operation state, judge that the three-phase voltage of the corresponding terminal device of switch on bus is
It is no to be less than Um* 95%, if so, the voltage transformer secondary measurement circuit of the switch is abnormality, opened if it is not, then obtaining this
The negative sequence component value of the three-phase voltage of corresponding terminal device is closed, and judges whether it is greater than Um* 5%, if so, the switch
It is abnormality that voltage transformer secondary, which measures circuit,；If it is not, then the voltage transformer secondary measurement circuit of the switch is normal
State；Wherein, UmFor busbar voltage；
When bus is abnormality, termination detection operation.
Specifically, busbar voltage U is determined as the following formulam:
Um=(U (i) a+U (i) b+U (i) c+U (j) a+U (j) b+U (j) c)/6
Wherein, U (i) a is a phase voltage of the corresponding equipment of i-th of switch on bus, and U (i) b is i-th of switch on bus
The b phase voltage of corresponding equipment, U (i) c are the c phase voltage of i-th of the corresponding equipment of switch on bus, and U (j) a is the on bus
The a phase voltage of the corresponding equipment of j switch, U (j) b are the b phase voltage of the corresponding equipment of j-th of switch on bus, and U (j) c is
The c phase voltage of the corresponding equipment of j-th of switch on bus.
Under the voltage transformer secondary measurement circuit of entire switchyard switch all normal situation, then judge that electric current is mutual
Whether sensor secondary circuit is abnormal；
Firstly, according to the type of switch (ring goes out to switch into ring and feeder switch), power is divided into two groups: ring is into ring
The power switched out is divided into one group, and the power of feeder switch is divided into one group.
Ring goes out the power switched into ring, is denoted as: P (1), P (2) ... ..., P (k)；
The power of feeder switch, is denoted as: P (k+1), P (k+2) ... ..., P (i)；(when calculating, it is specified that power calculation just
Direction: the power for flowing out bus is positive, and the power for flowing into bus is negative)；
The current transformer of the abnormality detection result to switch that circuit is measured according to the voltage transformer secondary of switch
Double measurement circuit carries out abnormality detection, and may include:
If the voltage transformer secondary measurement circuit of switch is normal condition, according to the operating power and braking work of bus
Rate carries out abnormality detection the Current Transformer Secondary measurement circuit of switch；Otherwise, termination detection.
Fig. 2 shows the movements of the power of substation of the embodiment of the present invention and switchyard double measurement circuit method for detecting abnormality
Performance diagram figure, as shown in Fig. 2, Current Transformer Secondary of the operating power and braking power according to bus to switch
Measurement circuit carries out abnormality detection, and may include:
If a. operating power of bus | ∑ P | it is greater than P0And meet and be greater than K* ∑ | P |, the power of bus is uneven shape
State then goes to step b, and otherwise the power of bus is equilibrium state, termination detection；
If b. the maximum switch of power variation meets in the detection switch set | Δ P (max) |/P (max) >
20%, then the secondary loop of mutual inductor of the switch of bus is abnormality, otherwise the current transformer two of the switch of bus
Minor loop is normal condition, termination detection；
The power variation Δ P (i) of i-th of switch in the detection switch set is calculated as follows；
Δ P (i)=P (i) '-P (i)
Wherein, K is ratio brake coefficient, K ∈ (0,1), P0For the startup power value of unbalanced power；P (i) ' is i-th
Switch is in the power of unbalanced power state, and P (i) is the power that i-th of switch is in power-balance state, and Δ P (max) is
The corresponding power variation of the maximum switch of power variation, P (max) are that the maximum switch of power variation is in power-balance
The power of state.
Specifically, the operating power of bus is determined as the following formula | ∑ P |:
| ∑ P |=| ∑ PRing+∑PFeedback|；
Wherein, ∑ PRing=P (1)+P (2)+...+P (k), ∑ PFeedback=P (k+1)+P (k+2)+...+P (k+s), ∑ PRingFor ring
Into ring go out the power switched and, P (k) is that k-th ring goes out the power switched into ring, and k is that ring goes out the quantity switched into ring on bus,
∑PFeedbackFor feeder switch power and, P (k+s) be s-th of feeder switch power, s be bus on feeder switch quantity；
The braking power ∑ of bus is determined as the following formula | P |:
∑ | P |=min (∑ | PRing|,∑|PFeedback|)
Wherein, ∑ | PRing|=| P (1) |+| P (2) |+...+| P (k) |, ∑ | PFeedback|=| P (k+1) |+| P (k+2) |+...+|
P (k+s) |, ∑ | PRing| go out switching components into ring for the ring of braking power, ∑ | PFeedback| it is the feeder switch component of braking power.
Embodiment two
Fig. 3 shows the structural representation of substation of the embodiment of the present invention and switchyard double measurement circuit abnormality detection system
Figure, as shown in figure 3, the system may include:
Module is obtained, for the corresponding terminal device of bus upper switch to be calibrated, and obtains and is marked with having time
Switch the three-phase voltage of corresponding terminal device；
Detection module, for the three-phase voltage using the corresponding terminal device of switch with same time label to mother
The Current Transformer Secondary measurement circuit of line, the voltage transformer secondary measurement circuit of bus upper switch and bus upper switch carries out
Abnormality detection.
Wherein, described that the corresponding terminal device of bus upper switch is calibrated, may include:
Each terminal device is calibrated according to preset time interval according to the time of time source, until each terminal is set
Standby time error, which is respectively less than, is equal to 10ms.
The detection module may include:
First detection unit, it is different for being carried out according to the three-phase voltage with same time marked terminal equipment to bus
Often detection；
Second detection unit, for being surveyed according to the abnormality detection result of bus to the voltage transformer secondary of bus upper switch
Amount circuit carries out abnormality detection；
Third detection unit, for measuring the abnormality detection result in circuit according to the voltage transformer secondary of switch to switch
Current Transformer Secondary measurement circuit carry out abnormality detection.
Specifically, the first detection unit, is used for:
If a phase voltage of bus upper switch i terminal device corresponding with switch j is all larger than Un* 90% and meet U (i)-U
(j) < Un* 5%, then bus is normal charging operation state, otherwise bus is abnormality；
Wherein, U (i) is a phase voltage of the corresponding terminal device of bus upper switch i, and U (j) is corresponding for bus upper switch j
Terminal device a phase voltage, i ≠ j, UnFor the voltage rating of bus.
The second detection unit, is used for:
When bus is normal charging operation state, judge that the three-phase voltage of the corresponding terminal device of switch on bus is
It is no to be less than Um* 95%, if so, the voltage transformer secondary measurement circuit of the switch is abnormality, opened if it is not, then obtaining this
The negative sequence component value of the three-phase voltage of corresponding terminal device is closed, and judges whether it is greater than Um* 5%, if so, the switch
It is abnormality that voltage transformer secondary, which measures circuit,；If it is not, then the voltage transformer secondary measurement circuit of the switch is normal
State；Wherein, UmFor busbar voltage；
When bus is abnormality, termination detection operation.
Specifically, busbar voltage U is determined as the following formulam:
Um=(U (i) a+U (i) b+U (i) c+U (j) a+U (j) b+U (j) c)/6
Wherein, U (i) a is a phase voltage of the corresponding equipment of i-th of switch on bus, and U (i) b is i-th of switch on bus
The b phase voltage of corresponding equipment, U (i) c are the c phase voltage of i-th of the corresponding equipment of switch on bus, and U (j) a is the on bus
The a phase voltage of the corresponding equipment of j switch, U (j) b are the b phase voltage of the corresponding equipment of j-th of switch on bus, and U (j) c is
The c phase voltage of the corresponding equipment of j-th of switch on bus.
The third detection unit, is used for:
If the voltage transformer secondary measurement circuit of switch is normal condition, according to the operating power and braking work of bus
The Current Transformer Secondary measurement circuit of rate switch carries out abnormality detection；Otherwise, termination detection.
The Current Transformer Secondary measurement circuit according to the operating power and braking power of bus switch carries out abnormal
It detects, may include:
The switch power of bus is divided into ring according to switchtype and goes out switch power and feeder switch power into ring, and according to ring
Go out switch power into ring and feeder switch power determine operating power | ∑ P | and braking power ∑ | P |；
If the operating power of bus | ∑ P | it is greater than P0And meet and be greater than K* ∑ | P |, then the switch power is uneven, presses
Formula calculates the power variation Δ P (i) of switch；
Δ P (i)=P (i) '-P (i)
The maximum switch of power variation is chosen, if under the power variation of the maximum switch of the power variation meets
Formula, then the secondary loop of mutual inductor of the switch is abnormality, otherwise the secondary loop of mutual inductor of the switch
Without exception and end operation；
| Δ P (max) |/P (max) > 20%；
Wherein, K is ratio brake coefficient, K ∈ (0,1), P0For the startup power value of unbalanced power；P (i) ' is i-th
Switch is in the power of unbalanced power state, and P (i) is the power that i-th of switch is in power-balance state, and Δ P (max) is
The corresponding power variation of the maximum switch of power variation, P (max) are that the maximum switch of power variation is in power-balance
The power of state.
Specifically, the operating power is determined as the following formula | ∑ P |:
| ∑ P |=| ∑ PRing+∑PFeedback|；
Wherein, ∑ PRing=P (1)+P (2)+...+P (k), ∑ PFeedback=P (k+1)+P (k+2)+...+P (k+s), ∑ PRingFor ring
Into ring go out the power switched and, P (k) is that k-th ring goes out the power switched into ring, and k is that ring goes out the quantity switched into ring on bus,
∑PFeedbackFor feeder switch power and, P (k+s) be s-th of feeder switch power, s be bus on feeder switch quantity；
The braking power ∑ is determined as the following formula | P |:
∑ | P |=min (∑ | PRing|,∑|PFeedback|)
Wherein, ∑ | PRing|=| P (1) |+| P (2) |+...+| P (k) |, ∑ | PFeedback|=| P (k+1) |+| P (k+2) |+...+|
P (k+s) |, ∑ | PRing| go out switching components into ring for the ring of braking power, ∑ | PFeedback| it is the feeder switch component of braking power.
Embodiment three
Fig. 4 shows the electric system of substation of the embodiment of the present invention and switchyard double measurement circuit method for detecting abnormality
Switchyard single busbar form main wiring diagram, as shown in figure 4, switch KG1 is ring into switch, switch KG2 is that ring goes out to switch, switch
KG3~KG6 is feeder switch, and the direction of power flows into bus by switch KG1, flows out bus by switch KG2~6.
A maintenance work station is configured in whole system, switch KG1~KG6 installs a terminal device, number note respectively
For ZD1~ZD6.For acquiring respective voltage and current, then by the data of voltage and current, it is sent to maintenance work station, by transporting
Dimension work station summarizes all data, and calculates the voltage effective value respectively switched and negative sequence voltage value, and corresponding
Performance number.
Maintenance work station is set as standard time source, mode when time synchronization uses the school SNPT started one every one minute
Task when secondary school, the work that terminal device ZD1~ZD6 deadline calibrates.
After maintenance work station sends the order for collecting all terminal device current times, terminal device ZD1~ZD6 is received
It to after the order, replys the current equipment time, the time that all terminal devices are replied is collected at maintenance work station, and mutually carries out
Compare, until the error of time synchronization, which meets, is less than 10ms.
Terminal device ZD1~ZD6 starts calculating task at whole moment minute, calculates the three-phase voltage and three of respective equipment
The real part of phase current, imaginary part, and according to calculate at the time of, label calculate serial number N.Then, will calculate serial number N, three-phase voltage with
The real part of three-phase current, imaginary part are sent to maintenance work station.
Maintenance work station is by real part, the void of the three-phase voltage of the same calculating serial number N of equipment ZD1~ZD6 and three-phase current
Portion is stored in together, can guarantee the data of same serial number in this way, that is, the data of discontinuity surface when thinking same.
Maintenance work station is collected into after the three-phase voltage of distribution terminal ZD1~ZD6, is compared to each other, when more than two
One phase voltage of a switch is all larger than Un* 90% and meet U (i)-U (j) < Un* 5%, then it is assumed that this section of bus normally charges, and
The voltage of bus is recorded as Um.
Wherein, U (i) is a phase voltage of the corresponding terminal device of bus upper switch i, and U (j) is corresponding for bus upper switch j
Terminal device a phase voltage, i ≠ j, UnFor the voltage rating of bus.
If bus normally charges, then judges whether voltage transformer secondary measurement circuit (circuit PT) of switch is normal.
Maintenance work station by the three-phase voltage of distribution terminal ZD1~ZD6 and Um successively compared with, if a certain phase of switch i
Voltage is less than Um* 95%, then it is judged as that the voltage transformer pt secondary circuit of switch i is abnormal.
If the three-phase piezoelectric voltage of all terminals is not less than Um* 95%, then calculate the negative phase-sequence of the three-phase voltage of each switch
Component value, if the negative sequence component value of switch i is greater than Um* 5%, then it is judged as the voltage transformer pt secondary circuit hair of switch i
It is raw abnormal.
If the negative sequence component value of the three-phase voltage of all switches is no more than Um* 5%, then it is assumed that, the electricity of all switches
Press PT secondary circuit normal.
If the PT secondary circuit of all switches is normal, then carries out judging that (CT is returned in Current Transformer Secondary measurement circuit
Road) exception；
Firstly, according to the type of switch (ring goes out to switch into ring and feeder switch), power is divided into two groups: ring is into ring
The power switched out is divided into one group, and the power of feeder switch is divided into one group.
Maintenance work station calculates ring and goes out the power switched into ring, be denoted as: P according to the voltage and current value of terminal ZD1~ZD6
(1), (2) P, in which: P (1)<0, P (2)>0.
And the power of feeder switch is calculated, it is denoted as: P (3), P (4), P (6), P (6).
The power calculation of all switches comes out and then calculates: | Σ P |=| P (1)+P (2)+...+P (6) |, Σ | P
|Ring goes out into ring=| P (1) |+| P (2) |, and Σ | P |Feeder line=| P (3) |+| P (4) |+| P (5) |+| P (6) |, Σ | P | take (Σ | P
|Ring goes out into ring, Σ | P |Feeder line) in smaller value；
Then, using the principle of ratio brake, judge whether power meets | ∑ P | it is greater than P0And it is greater than K* ∑ | P |, if full
Sufficient then unbalanced power, record save the power at current time, are denoted as: P (1) '~P (6) '；Wherein K=0.05, P0 take (P (1)
~P (6)) in 0.15 times of minimum value.
Otherwise power-balance, record save the power respectively switched at current time, are denoted as: P (1)~P (6).
Finally, calculating the power variation of each switch again: Δ P (i)=P (i) '-P (i), 1≤i≤6.
In the power variation of all switches, maximum power variation Δ P (max) is selected, and meet | Δ P
(max) |/P (max) > 20%, then it is assumed that the Current Transmit secondary circuit of the switch is abnormal.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, it should be understood by those ordinary skilled in the art that: still
It can be with modifications or equivalent substitutions are made to specific embodiments of the invention, and without departing from any of spirit and scope of the invention
Modification or equivalent replacement, should all cover within the scope of the claims of the present invention.
Claims (10)
1. a kind of substation and switchyard double measurement circuit method for detecting abnormality, which is characterized in that the described method includes:
The corresponding terminal device of bus upper switch is calibrated, and obtains the corresponding terminal device of switch marked with having time
Three-phase voltage；
Using the three-phase voltage for switching corresponding terminal device with same time label to the voltage of bus, bus upper switch
The Current Transformer Secondary of mutual inductor double measurement circuit and bus upper switch measurement circuit carries out abnormality detection.
2. the method as described in claim 1, which is characterized in that described to carry out school to the corresponding terminal device of bus upper switch
When, comprising:
Each terminal device is calibrated according to preset time interval according to the time of time source, until each terminal device
Time error, which is respectively less than, is equal to 10ms.
3. the method as described in claim 1, which is characterized in that described to utilize the switch corresponding end with same time label
The electric current that the three-phase voltage of end equipment measures circuit and bus upper switch to the voltage transformer secondary of bus, bus upper switch is mutual
Sensor double measurement circuit carries out abnormality detection, comprising:
Bus is carried out abnormality detection according to the three-phase voltage with same time marked terminal equipment；
It is carried out abnormality detection according to voltage transformer secondary measurement circuit of the abnormality detection result of bus to bus upper switch；
The Current Transformer Secondary of switch is measured according to the abnormality detection result that the voltage transformer secondary of switch measures circuit
Circuit carries out abnormality detection.
4. method as claimed in claim 3, which is characterized in that the basis has the three of same time marked terminal equipment
Phase voltage carries out abnormality detection bus, comprising:
If a phase voltage of bus upper switch i terminal device corresponding with switch j is all larger than Un* 90% and meet U (i)-U (j) <
Un* 5%, then bus is normal charging operation state, otherwise bus is abnormality；
Wherein, U (i) is a phase voltage of the corresponding terminal device of bus upper switch i, and U (j) is bus upper switch j corresponding end
One phase voltage of end equipment, i ≠ j, UnFor the voltage rating of bus.
5. method as claimed in claim 3, which is characterized in that the abnormality detection result according to bus is to bus upper switch
Voltage transformer secondary measurement circuit carry out abnormality detection, comprising:
When bus is normal charging operation state, judge whether the three-phase voltage of the corresponding terminal device of switch on bus is small
In Um* 95%, if so, the voltage transformer secondary measurement circuit of the switch is abnormality, if it is not, then obtaining the switch pair
The negative sequence component value of the three-phase voltage for the terminal device answered, and judge whether it is greater than Um* 5%, if so, the voltage of the switch
Mutual inductor double measurement circuit is abnormality；If it is not, then the voltage transformer secondary measurement circuit of the switch is normal condition；
Wherein, UmFor busbar voltage；
When bus is abnormality, termination detection operation.
6. method as claimed in claim 5, which is characterized in that determine busbar voltage U as the following formulam:
Um=(U (i) a+U (i) b+U (i) c+U (j) a+U (j) b+U (j) c)/6
Wherein, U (i) a is a phase voltage of the corresponding equipment of i-th of switch on bus, and U (i) b is that i-th of switch corresponds on bus
Equipment b phase voltage, U (i) c is the c phase voltage of i-th of the corresponding equipment of switch on bus, and U (j) a is j-th on bus
The a phase voltage of corresponding equipment is switched, U (j) b is the b phase voltage of the corresponding equipment of j-th of switch on bus, and U (j) c is bus
The c phase voltage of the corresponding equipment of upper j-th of switch.
7. the method as described in claim 1, which is characterized in that described to measure circuit according to the voltage transformer secondary of switch
Abnormality detection result carries out abnormality detection the Current Transformer Secondary measurement circuit of switch, comprising:
If the voltage transformer secondary measurement circuit of switch is normal condition, according to the operating power and braking power pair of bus
The Current Transformer Secondary measurement circuit of switch carries out abnormality detection；
Otherwise, termination detection.
8. the method for claim 7, which is characterized in that the operating power and braking power according to bus is to switch
Current Transformer Secondary measurement circuit carry out abnormality detection, comprising:
If a. operating power of bus | ∑ P | it is greater than P0And meet and be greater than K* ∑ | P |, then step b is gone to, otherwise termination detection；
If b. the maximum switch of power variation meets in the detection switch set | Δ P (max) |/P (max) > 20%,
The secondary loop of mutual inductor of the switch of bus is abnormality, and otherwise the secondary loop of mutual inductor of the switch of bus is
Normal condition, termination detection；
The power variation Δ P (i) of i-th of switch in the detection switch set is calculated as follows；
Δ P (i)=P (i) '-P (i)
Wherein, K is ratio brake coefficient, K ∈ (0,1), P0For the startup power value of unbalanced power；P (i) ' is i-th of switch
Power in unbalanced power state, P (i) are the power that i-th of switch is in power-balance state, and Δ P (max) is power
The corresponding power variation of the maximum switch of variable quantity, P (max) are that the maximum switch of power variation is in power-balance state
Power.
9. method according to claim 8, which is characterized in that determine the operating power of bus as the following formula | ∑ P |:
| ∑ P |=| ∑ PRing+∑PFeedback|；
Wherein, ∑ PRing=P (1)+P (2)+...+P (k), ∑ PFeedback=P (k+1)+P (k+2)+...+P (k+s), ∑ PRingIt is ring into ring
The power that switchs out and, P (k) is that k-th of ring goes out the power switched into ring, and k is that ring goes out the quantity switched, ∑ P into ring on busFeedback
For feeder switch power and, P (k+s) be s-th of feeder switch power, s be bus on feeder switch quantity；
The braking power ∑ of bus is determined as the following formula | P |:
∑ | P |=min (∑ | PRing|,∑|PFeedback|)
Wherein, ∑ | PRing|=| P (1) |+| P (2) |+...+| P (k) |, ∑ | PFeedback|=| P (k+1) |+| P (k+2) |+...+| P (k+
S) |, ∑ | PRing| go out switching components into ring for the ring of braking power, ∑ | PFeedback| it is the feeder switch component of braking power.
10. a kind of substation and switchyard double measurement circuit abnormality detection system, which is characterized in that the system comprises:
Module is obtained, for the corresponding terminal device of bus upper switch to be calibrated, and obtains the switch marked with having time
The three-phase voltage of corresponding terminal device；
Detection module, for the three-phase voltage using the corresponding terminal device of switch with same time label to bus, mother
The voltage transformer secondary measurement circuit of On line switch and the Current Transformer Secondary measurement circuit of bus upper switch carry out abnormal
Detection.
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