CN103852693B - A kind of determination methods of Little Current Ground Connection System - Google Patents
A kind of determination methods of Little Current Ground Connection System Download PDFInfo
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- CN103852693B CN103852693B CN201410115655.3A CN201410115655A CN103852693B CN 103852693 B CN103852693 B CN 103852693B CN 201410115655 A CN201410115655 A CN 201410115655A CN 103852693 B CN103852693 B CN 103852693B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides a kind of determination methods of Little Current Ground Connection System, including step are as follows：Medium voltage distribution network is modeled；Judge active power and reactive power direction；The parameter of each interconnection and each middle point voltage size and phase angle；The gap of value of the value of each interconnection parameter with looking into the calculating of wire parameter list judges whether with failure；Breakdown judge in isolated neutral system；In neutral point through the breakdown judge in arc suppression coil system, the beneficial effects of the present invention are：Small current earthing wire-selecting function can be made to increase substantially accuracy rate, reach before failure is further developed into as phase to phase fault even three-phase fault, fault loop failure phase can accurately be positioned, so as to avoid using traditional open line method, each failure associated loop is set respectively to have a power failure once, so as to reduce power off time, increase power supply reliability.
Description
Technical field
The present invention relates to a kind of medium-voltage distribution technical field, more particularly to a kind of judgement side of Little Current Ground Connection System
Method.
Background technology
In medium voltage distribution network, earthed system is generally used in small current neutral grounding system, wherein small current neutral grounding system
System is divided into isolated neutral system and neutral by arc extinction coil grounding system, during wherein isolated neutral system is at present
The neutral grounding mode being widely popularized in pressure system.And the earthing mode of neutral by arc extinction coil grounding is slowly being eliminated.
Singlephase earth fault accounts for more than the 90% of all earth fault probability of happening of all power systems, in small current neutral grounding
In system, when occurring this failure, it can operate with failure 2 hours, such a method of operation power supply reliability is higher.
In traditional Little Current Ground Connection System, due to the particularity of small current neutral grounding system（Small current neutral grounding system
The zero-sequence current of system is exactly transmission line capacitor electric current, because the existing active energy of the electric energy of transmission line, there is reactive energy again,
Therefore transmission line capacitor electric current is the small part of the reactive energy transmitted on transmission line, the basic nothing of traditional detection method
Method detects the increment of charging capacitor electric current on transmission line, therefore judges that small current earthing wire-selecting substantially less may be used by some
The index leaned on, therefore this problem is always one of several big unsolved problems of power system）, judgment accuracy less than 50%,
Under some extreme conditions, judgment accuracy is less than 20%.Therefore for the judgment accuracy of small current earthing wire-selecting method, also have
The space of larger lifting.
The content of the invention
It is an object of the invention to solve in MV distribution systems, due in most of medium-voltage distribution room piezoelectricity traditional
In Little Current Ground Connection System, because the zero-sequence current of the particularity small current neutral grounding system of small current neutral grounding system is exactly to pass
Defeated line capacitance electric current, because the existing active energy of the electric energy of transmission line, there is reactive energy, therefore transmission line capacitor electric current again
The small part of the reactive energy simply transmitted on transmission line, traditional detection method can not detect to fill on transmission line at all
The increment of electric capacitance current, therefore judge that small current earthing wire-selecting substantially leans on some less reliable indexs, correct judgment
The determination methods of the low deficiency of rate and a kind of new Little Current Ground Connection System of offer.
The present invention is achieved through the following technical solutions：A kind of determination methods of Little Current Ground Connection System, bag
Include step as follows：
（1）Medium voltage distribution network is modeled, the step can refer to number of patent application：201410086502.0（In one kind
It is press-fitted the method for electrical grid transmission line model）
（2）According to step（1）Middle medium-voltage distribution pessimistic concurrency control carries out judging active power and reactive power direction, and the step can
It is 201310204650.2 with reference to number of patent application（A kind of method of discrimination for the method for observing two-dimentional law of conservation energy）It is special
Profit application；
（3）According to step（2）The middle parameter for judging active power and reactive power direction calculating each interconnection and each
Middle point voltage size and phase angle, it is 201310484430.0 that the step, which can refer to number of patent application,（A kind of distribution network parameters meter
Calculation method）Patent application；
（4）According to step（3）Value of the middle value for calculating each interconnection parameter got with looking into the calculating of wire parameter list
Gap judges whether with failure, if the value of each interconnection parameter is with looking into the value difference of wire parameter list calculating away from larger
And the equal working condition of each equipment is normal, then explanation breaks down；
（5）Breakdown judge in isolated neutral system；
（6）In neutral point through the breakdown judge in arc suppression coil system.
Further, the step（4）The reason for middle failure, judges as follows：Wire active loss increase is more than other wires
Situation, contact resistance is excessive or has virtual connection phenomenon, belongs to contact loss, causes the improper rise of line resistance；If
Work(power attenuation has significantly abnormal increase, illustrates there is leakage loss, it is understood that there may be three-phase shortcircuit, line to line fault, two connect
The generation path of the failures such as ground short circuit, but now fault loop does not occur to puncture on a large scale, only some leakage losses, failure
Still in early stage, it is necessary to exclude early.
Further, the step（5）Breakdown judge in isolated neutral system can be divided into：（1）In single supply
In single line isolated neutral system, occurs singlephase earth fault；Residual voltage inspection element alarm；Fault loop failure phase
It is non-faulting phase capacitance charging currentTimes；Fault loop non-faulting is mutually the normal phase capacitance charging current of non-fault loop
'sTimes；The normal phase capacitance charging current in non-faulting loop can be calculated according to wire parameter list；Therefore according to single supply
When the medium voltage distribution network parameter values that single loop modeling is drawn are that non-fault loop is normally runTimes or 3 times, and failure
Loop fault phase and non-faulting phase capacitance charging current are in opposite direction, it can be determined that go out single supply single loop small current neutral grounding system
Generation singlephase earth fault；
（2）In single supply multiloop isolated neutral system, singlephase earth fault occurs for line side；Power source bus zero
Sequence voltage supervision element alarm；Non-electrical resource loop non-faulting loop non-faulting phase capacitance charging current keeps constant；Non-power is returned
Road non-faulting loop fault phase capacitance charging current is zero；Electric power loop non-faulting loop non-faulting phase capacitance charging current is institute
There is the non-faulting phase capacitance charging current sum corresponding to non-electrical resource loop；Capacitance charging current direction and normal operation phase
Together；Electric power loop non-faulting loop fault phase capacitance charging current is all loop non-faulting phase capacitance charging current sums；Electricity
It is opposite when the capacity charge sense of current is with normal operation；Non-power loop fault loop non-faulting phase capacitance charging current is kept not
Become；Non-power loop fault loop fault phase capacitance charging current is all loop non-faulting phase electric capacity from an electric current sum；Electricity
It is opposite when the capacity charge sense of current is with normal operation；Therefore the charging of each each phase of loop that can be according to obtained by being calculated parameter
The size and Orientation of capacitance current, draws fault loop failure phase.
（3）In single supply multiloop isolated neutral system, power supply, which is surveyed, occurs singlephase earth fault；Power source bus zero
Sequence voltage supervision element alarm；Non-electrical resource loop non-faulting loop non-faulting phase capacitance charging current keeps constant；Non-power is returned
Road non-faulting loop fault phase capacitance charging current is zero；Electric power loop fault loop non-faulting phase capacitance charging current is all
Non-faulting phase capacitance charging current sum corresponding to non-electrical resource loop；It is identical when capacitance charging current direction is with normal operation；
Electric power loop fault loop failure phase capacitance charging current is all loop non-faulting phase capacitance charging current sums；Electric capacity charges
It is opposite when the sense of current is with normal operation；Therefore the charging capacitor electricity of each each phase of loop that can be according to obtained by being calculated parameter
The size and Orientation of stream, draws electric power loop failure phase.
Further, the step（6）It can be divided into through the breakdown judge in arc suppression coil system in neutral point:（1）In list
In power supply multiloop neutral by arc extinction coil grounding system, using full compensation way, singlephase earth fault occurs for line side；Electricity
Source bus residual voltage supervision element alarm；Non-electrical resource loop non-faulting loop non-faulting phase capacitance charging current keeps constant；
Non-electrical resource loop non-faulting loop fault phase capacitance charging current is zero；The non-faulting phase electric capacity charging of electric power loop non-faulting loop
Electric current is the non-faulting phase capacitance charging current sum corresponding to all non-electrical resource loops；Capacitance charging current direction and normal fortune
It is identical during row；Electric power loop non-faulting loop fault phase capacitance charging current is zero；Non-power loop fault loop non-faulting phase
Capacitance charging current keeps constant；Non-power loop fault loop fault phase capacitance charging current is zero；Therefore in such cases
It can not show which bar loop is fault loop, which bar loop is normal loop；And series resonance can be produced in such cases, carried
High arc suppression coil connects neutral point voltage, and actual motion never uses such a mode；
（2）In single supply multiloop neutral by arc extinction coil grounding system, using undercompensation mode, line side occurs
Singlephase earth fault；The supervision element alarm of power source bus residual voltage；Non-electrical resource loop non-faulting loop non-faulting phase electric capacity fills
Electric current keeps constant；Non-electrical resource loop non-faulting loop fault phase capacitance charging current is zero；Electric power loop non-faulting loop
Non-faulting phase capacitance charging current is the non-faulting phase capacitance charging current sum corresponding to all non-electrical resource loops.Electric capacity charges
It is identical when the sense of current is with normal operation；Electric power loop fault loop failure phase capacitance charging current is all loop non-faulting phases
Capacitance charging current sum again and arc suppression coil compensation inductive current difference.Capacitance charging current direction and normal operation phase
Instead；Non-power loop fault loop non-faulting phase capacitance charging current keeps constant；Non-power loop fault loop fault is mutually electric
Capacity charge electric current be all loop non-faulting phase electric capacity from an electric current sum again and arc suppression coil compensation inductive current difference；Electric capacity
It is opposite when charging current direction is with normal operation；Therefore in such cases, fault loop failure phase capacitance charging current parameter meter
The result drawn should be negative value, normal mutually in opposite direction with faulted phase current, and other are mutually all different with other loops,
Fault loop failure phase can so be measured；But it is due to meeting in the case of some line outages, due to subtracting for transmission line capacitor
Few, joint performance is turned into full compensation, therefore does not typically use such a compensation way；
（3）In single supply multiloop neutral by arc extinction coil grounding system, using overcompensation mode, line side occurs
Singlephase earth fault；The supervision element alarm of power source bus residual voltage；Non-electrical resource loop non-faulting loop non-faulting phase electric capacity fills
Electric current keeps constant；Non-electrical resource loop non-faulting loop fault phase capacitance charging current is zero；Electric power loop non-faulting loop
Non-faulting phase capacitance charging current is the non-faulting phase capacitance charging current sum corresponding to all non-electrical resource loops；Electric capacity charges
It is identical when the sense of current is with normal operation；Electric power loop non-faulting loop fault phase capacitance charging current is all loop non-faulting
Phase capacitance charging current sum again and arc suppression coil compensation inductive current difference；Capacitance charging current direction and normal operation phase
Together；Non-power loop fault loop non-faulting phase capacitance charging current keeps constant；Non-power loop fault loop fault is mutually electric
Capacity charge electric current be all loop non-faulting phase electric capacity from an electric current sum again and arc suppression coil compensation inductive current difference；Electric capacity
It is identical when charging current direction is with normal operation；Therefore in such cases, fault loop failure phase capacitance charging current parameter meter
The result drawn should be on the occasion of；In general, although fault loop and non-faulting tank capacitance charging current direction
It is identical；Because compensativity is fixed, this capacitance charging current is far longer than the normal phase electric capacity in normal loop and filled under normal circumstances
Electric current, other are mutually all different with other loops, can so measure fault loop failure phase；Only with System Development,
Transmission line circuit number increase in system, when capacitance charging current is equal to arc suppression coil compensation inductive current, just occurring to sentence
Disconnected situation, and such a method of operation is the full compensation method of operation, intermediate distribution system never takes such a method of operation；Therefore
It may determine that fault loop failure phase；
（4）In single supply multiloop neutral by arc extinction coil grounding system, using overcompensation mode, mains side occurs
Singlephase earth fault；Because full compensation circuit and undercompensation circuit are not used in actual applications, therefore only consider overcompensation fortune
The situation of line mode；The supervision element alarm of power source bus residual voltage；Non-electrical resource loop non-faulting loop non-faulting phase electric capacity fills
Electric current keeps constant；Non-electrical resource loop non-faulting loop fault phase capacitance charging current is zero；Electric power loop fault loop is non-
Failure phase capacitance charging current is the non-faulting phase capacitance charging current sum corresponding to all non-electrical resource loops；Electric capacity charging electricity
It is identical when flowing direction with normal operation；Electric power loop fault loop failure phase capacitance charging current is all loop non-faulting mutually electricity
Capacity charge electric current sum again and arc suppression coil compensation inductive current difference；It is identical when capacitance charging current direction is with normal operation；
Therefore in such cases, the result that fault loop failure phase capacitance charging current parameter is calculated should be on the occasion of；General
In the case of, because compensativity is fixed, this capacitance charging current is far longer than the normal phase electric capacity in normal loop under normal circumstances
Charging current, other are mutually all different with other loops, can so measure fault loop failure phase；Only sent out with system
Transmission line circuit number increase in exhibition, system, when capacitance charging current is equal to arc suppression coil compensation inductive current, just occurring can not
The situation of judgement, and such a method of operation is the full compensation method of operation, intermediate distribution system never takes such a method of operation；Cause
This may determine that fault loop failure phase.
The beneficial effects of the present invention are：Small current earthing wire-selecting function can be made to increase substantially accuracy rate, reached in event
Barrier is further developed into before phase to phase fault even three-phase fault, fault loop failure phase can be accurately positioned, so as to avoid
Using traditional open line method, each failure associated loop is set respectively to have a power failure once, so as to reduce power off time, increase power supply is reliable
Property.
Brief description of the drawings
Fig. 1 is single supply single line isolated neutral system principle schematic of the present invention；
Fig. 2 is single supply single line isolated neutral system structural representation of the present invention；
Fig. 3 is single supply multi-line isolated neutral system structural representation of the present invention；
Fig. 4 is single supply multi-line isolated neutral system outlet damaged structure schematic diagram of the present invention；
Fig. 5 is single supply multi-line isolated neutral system power failure structural representation of the present invention；
Fig. 6 is single supply multi-line neutral by arc extinction coil grounding system health structural representation of the present invention；
Fig. 7 is single supply multi-line neutral by arc extinction coil grounding system outlet damaged structure schematic diagram of the present invention；
Fig. 8 is single supply multi-line neutral by arc extinction coil grounding system power supply damaged structure schematic diagram of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and embodiment is described further to the present invention：
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, a kind of judgement side of Little Current Ground Connection System
Method, including step are as follows：
（1）Medium voltage distribution network is modeled, it is 201410086502.0 that the step, which can refer to number of patent application,（In one kind
It is press-fitted the method for electrical grid transmission line model）Patent application；
（2）According to step（1）Middle medium-voltage distribution pessimistic concurrency control carries out judging active power and reactive power direction, and the step can
It is 201310204650.2 with reference to number of patent application（A kind of method of discrimination for the method for observing two-dimentional law of conservation energy）It is special
Profit application；
（3）According to step（2）The middle parameter for judging active power and reactive power direction calculating each interconnection and each
Middle point voltage size and phase angle, it is 201310484430.0 that the step, which can refer to number of patent application,（A kind of distribution network parameters meter
Calculation method）Patent application；
（4）According to step（3）Value of the middle value for calculating each interconnection parameter got with looking into the calculating of wire parameter list
Gap judges whether with failure, if the value of each interconnection parameter is with looking into the value difference of wire parameter list calculating away from larger
And the equal working condition of each equipment is normal, then explanation breaks down；
（5）Breakdown judge in isolated neutral system；
（6）In neutral point through the breakdown judge in arc suppression coil system.
Further, the step（4）The reason for middle failure, judges as follows：Wire active loss increase is more than other wires
Situation, contact resistance is excessive or has virtual connection phenomenon, belongs to contact loss, causes the improper rise of line resistance；If
Work(power attenuation has significantly abnormal increase, illustrates there is leakage loss, it is understood that there may be three-phase shortcircuit, line to line fault, two connect
The generation path of the failures such as ground short circuit, but now fault loop does not occur to puncture on a large scale, only some leakage losses, failure
Still in early stage, it is necessary to exclude early.
Further, the step（5）Breakdown judge in isolated neutral system can be divided into：（1）In single supply
In single line isolated neutral system, occurs singlephase earth fault；Residual voltage inspection element alarm；Fault loop failure phase
It is non-faulting phase capacitance charging currentTimes；Fault loop non-faulting is mutually the normal phase capacitance charging current of non-fault loop
'sTimes；The normal phase capacitance charging current in non-faulting loop can be calculated according to wire parameter list；Therefore according to single supply
When the medium voltage distribution network parameter values that single loop modeling is drawn are that non-fault loop is normally runTimes or 3 times, and failure
Loop fault phase and non-faulting phase capacitance charging current are in opposite direction, it can be determined that go out single supply single loop small current neutral grounding system
Generation singlephase earth fault；
（2）In single supply multiloop isolated neutral system, singlephase earth fault occurs for line side；Power source bus zero
Sequence voltage supervision element alarm；Non-electrical resource loop non-faulting loop non-faulting phase capacitance charging current keeps constant；Non-power is returned
Road non-faulting loop fault phase capacitance charging current is zero；Electric power loop non-faulting loop non-faulting phase capacitance charging current is institute
There is the non-faulting phase capacitance charging current sum corresponding to non-electrical resource loop；Capacitance charging current direction and normal operation phase
Together；Electric power loop non-faulting loop fault phase capacitance charging current is all loop non-faulting phase capacitance charging current sums；Electricity
It is opposite when the capacity charge sense of current is with normal operation；Non-power loop fault loop non-faulting phase capacitance charging current is kept not
Become；Non-power loop fault loop fault phase capacitance charging current is all loop non-faulting phase electric capacity from an electric current sum；Electricity
It is opposite when the capacity charge sense of current is with normal operation；Therefore the charging of each each phase of loop that can be according to obtained by being calculated parameter
The size and Orientation of capacitance current, draws fault loop failure phase.
（3）In single supply multiloop isolated neutral system, power supply, which is surveyed, occurs singlephase earth fault；Power source bus zero
Sequence voltage supervision element alarm；Non-electrical resource loop non-faulting loop non-faulting phase capacitance charging current keeps constant；Non-power is returned
Road non-faulting loop fault phase capacitance charging current is zero；Electric power loop fault loop non-faulting phase capacitance charging current is all
Non-faulting phase capacitance charging current sum corresponding to non-electrical resource loop；It is identical when capacitance charging current direction is with normal operation；
Electric power loop fault loop failure phase capacitance charging current is all loop non-faulting phase capacitance charging current sums；Electric capacity charges
It is opposite when the sense of current is with normal operation；Therefore the charging capacitor electricity of each each phase of loop that can be according to obtained by being calculated parameter
The size and Orientation of stream, draws electric power loop failure phase.
Further, the step（6）It can be divided into through the breakdown judge in arc suppression coil system in neutral point：
（1）In single supply multiloop neutral by arc extinction coil grounding system, using full compensation way, line side occurs
Singlephase earth fault；The supervision element alarm of power source bus residual voltage；Non-electrical resource loop non-faulting loop non-faulting phase electric capacity fills
Electric current keeps constant；Non-electrical resource loop non-faulting loop fault phase capacitance charging current is zero；Electric power loop non-faulting loop
Non-faulting phase capacitance charging current is the non-faulting phase capacitance charging current sum corresponding to all non-electrical resource loops；Electric capacity charges
It is identical when the sense of current is with normal operation；Electric power loop non-faulting loop fault phase capacitance charging current is zero；Non-electrical resource loop
Fault loop non-faulting phase capacitance charging current keeps constant；Non-power loop fault loop fault phase capacitance charging current is
Zero；Therefore it can not show which bar loop is fault loop in such cases, which bar loop is normal loop；And in such cases
Series resonance can be produced, arc suppression coil is improved and connects neutral point voltage, actual motion never uses such a mode；
（2）In single supply multiloop neutral by arc extinction coil grounding system, using undercompensation mode, line side occurs
Singlephase earth fault；The supervision element alarm of power source bus residual voltage；Non-electrical resource loop non-faulting loop non-faulting phase electric capacity fills
Electric current keeps constant；Non-electrical resource loop non-faulting loop fault phase capacitance charging current is zero；Electric power loop non-faulting loop
Non-faulting phase capacitance charging current is the non-faulting phase capacitance charging current sum corresponding to all non-electrical resource loops.Electric capacity charges
It is identical when the sense of current is with normal operation；Electric power loop fault loop failure phase capacitance charging current is all loop non-faulting phases
Capacitance charging current sum again and arc suppression coil compensation inductive current difference.Capacitance charging current direction and normal operation phase
Instead；Non-power loop fault loop non-faulting phase capacitance charging current keeps constant；Non-power loop fault loop fault is mutually electric
Capacity charge electric current be all loop non-faulting phase electric capacity from an electric current sum again and arc suppression coil compensation inductive current difference；Electric capacity
It is opposite when charging current direction is with normal operation；Therefore in such cases, fault loop failure phase capacitance charging current parameter meter
The result drawn should be negative value, normal mutually in opposite direction with faulted phase current, and other are mutually all different with other loops,
Fault loop failure phase can so be measured；But it is due to meeting in the case of some line outages, due to subtracting for transmission line capacitor
Few, joint performance is turned into full compensation, therefore does not typically use such a compensation way；
（3）In single supply multiloop neutral by arc extinction coil grounding system, using overcompensation mode, line side occurs
Singlephase earth fault；The supervision element alarm of power source bus residual voltage；Non-electrical resource loop non-faulting loop non-faulting phase electric capacity fills
Electric current keeps constant；Non-electrical resource loop non-faulting loop fault phase capacitance charging current is zero；Electric power loop non-faulting loop
Non-faulting phase capacitance charging current is the non-faulting phase capacitance charging current sum corresponding to all non-electrical resource loops；Electric capacity charges
It is identical when the sense of current is with normal operation；Electric power loop non-faulting loop fault phase capacitance charging current is all loop non-faulting
Phase capacitance charging current sum again and arc suppression coil compensation inductive current difference；Capacitance charging current direction and normal operation phase
Together；Non-power loop fault loop non-faulting phase capacitance charging current keeps constant；Non-power loop fault loop fault is mutually electric
Capacity charge electric current be all loop non-faulting phase electric capacity from an electric current sum again and arc suppression coil compensation inductive current difference；Electric capacity
It is identical when charging current direction is with normal operation；Therefore in such cases, fault loop failure phase capacitance charging current parameter meter
The result drawn should be on the occasion of；In general, although fault loop and non-faulting tank capacitance charging current direction
It is identical；Because compensativity is fixed, this capacitance charging current is far longer than the normal phase electric capacity in normal loop and filled under normal circumstances
Electric current, other are mutually all different with other loops, can so measure fault loop failure phase；Only with System Development,
Transmission line circuit number increase in system, when capacitance charging current is equal to arc suppression coil compensation inductive current, just occurring to sentence
Disconnected situation, and such a method of operation is the full compensation method of operation, intermediate distribution system never takes such a method of operation；Therefore
It may determine that fault loop failure phase；
（4）In single supply multiloop neutral by arc extinction coil grounding system, using overcompensation mode, mains side occurs
Singlephase earth fault；Because full compensation circuit and undercompensation circuit are not used in actual applications, therefore only consider overcompensation fortune
The situation of line mode；The supervision element alarm of power source bus residual voltage；Non-electrical resource loop non-faulting loop non-faulting phase electric capacity fills
Electric current keeps constant；Non-electrical resource loop non-faulting loop fault phase capacitance charging current is zero；Electric power loop fault loop is non-
Failure phase capacitance charging current is the non-faulting phase capacitance charging current sum corresponding to all non-electrical resource loops；Electric capacity charging electricity
It is identical when flowing direction with normal operation；Electric power loop fault loop failure phase capacitance charging current is all loop non-faulting mutually electricity
Capacity charge electric current sum again and arc suppression coil compensation inductive current difference；It is identical when capacitance charging current direction is with normal operation；
Therefore in such cases, the result that fault loop failure phase capacitance charging current parameter is calculated should be on the occasion of；General
In the case of, because compensativity is fixed, this capacitance charging current is far longer than the normal phase electric capacity in normal loop under normal circumstances
Charging current, other are mutually all different with other loops, can so measure fault loop failure phase；Only sent out with system
Transmission line circuit number increase in exhibition, system, when capacitance charging current is equal to arc suppression coil compensation inductive current, just occurring can not
The situation of judgement, and such a method of operation is the full compensation method of operation, intermediate distribution system never takes such a method of operation；Cause
This may determine that fault loop failure phase.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula carries out appropriate change and modification.Therefore, the invention is not limited in embodiment disclosed and described above, to this
Some modifications and changes of invention should also be as falling into the scope of the claims of the present invention.Although in addition, this specification
In used some specific terms, but these terms are merely for convenience of description, do not constitute any limitation to the present invention.
Claims (4)
1. a kind of determination methods of Little Current Ground Connection System, it is characterised in that comprise the following steps：
（1）Medium voltage distribution network is modeled；
（2）According to step（1）Middle medium-voltage distribution pessimistic concurrency control judges active power and reactive power direction；
（3）According to step（2）The middle parameter for judging active power and reactive power direction calculating each interconnection and each in the middle of
Point voltage swing and phase angle；
（4）According to step（3）The middle value for calculating each interconnection parameter got and the gap for looking into the value that wire parameter list is calculated
Judge whether with failure, if the value of each interconnection parameter is with looking into the value difference of wire parameter list calculating away from larger and each
The individual equal working condition of equipment is normal, then explanation breaks down；
（5）Breakdown judge in isolated neutral system；
（6）In neutral point through the breakdown judge in arc suppression coil system.
2. the determination methods of Little Current Ground Connection System according to claim 1, it is characterised in that：The step（4）
The reason for middle failure, judges as follows：Wire active loss increases the situation more than other wires, and contact resistance is excessive or has void
Phenomenon is connect, belongs to contact loss, causes the improper rise of line resistance；If active power loss has significantly abnormal increasing
Greatly, illustrate there is leakage loss, it is understood that there may be three-phase shortcircuit, line to line fault, the generation path of two-phase short circuit and ground fault, but now
Fault loop does not occur to puncture on a large scale, only some leakage losses, and failure is still in early stage, it is necessary to exclude early.
3. the determination methods of Little Current Ground Connection System according to claim 1, it is characterised in that：The step（5）
Breakdown judge in isolated neutral system can be divided into：
In single supply single line isolated neutral system singlephase earth fault occurs for j；Residual voltage supervision element alarm；
Fault loop failure is mutually non-faulting phase capacitance charging currentTimes；Fault loop non-faulting is mutually that non-fault loop is normal
Phase capacitance charging currentTimes；The normal phase capacitance charging current in non-faulting loop can be calculated according to wire parameter list；
Therefore when the medium voltage distribution network parameter values drawn according to the modeling of single supply single loop are that non-fault loop is normally runTimes
Or 3 times, and fault loop failure phase and non-faulting phase capacitance charging current are in opposite direction, can interpolate that out single supply single loop
Singlephase earth fault occurs for small current neutral grounding system；
K is in single supply multiloop isolated neutral system, and singlephase earth fault occurs for line side；Power source bus residual voltage
Supervise element alarm；Non-electrical resource loop non-faulting loop non-faulting phase capacitance charging current keeps constant；The non-event of non-electrical resource loop
It is zero to hinder loop fault phase capacitance charging current；Electric power loop non-faulting loop non-faulting phase capacitance charging current is all non-electrical
Non-faulting phase capacitance charging current sum corresponding to resource loop；It is identical when capacitance charging current direction is with normal operation；Power supply
Loop non-faulting loop fault phase capacitance charging current is all loop non-faulting phase capacitance charging current sums；Electric capacity charging electricity
It is opposite when flowing direction with normal operation；Non-power loop fault loop non-faulting phase capacitance charging current keeps constant；Non-power
Loop fault loop fault phase capacitance charging current is all loop non-faulting phase capacitance charging current sums；Capacitance charging current
It is opposite when direction is with normal operation；Therefore, it is possible to the charging capacitor electric current of each each phase of loop obtained by being calculated according to parameter
Size and Orientation, draws fault loop failure phase；
L is in single supply multiloop isolated neutral system, and power supply, which is surveyed, occurs singlephase earth fault；Power source bus zero sequence electricity
Pressure supervision element alarm；Non-electrical resource loop non-faulting loop non-faulting phase capacitance charging current keeps constant；Non-electrical resource loop is non-
Fault loop failure phase capacitance charging current is zero；Electric power loop fault loop non-faulting phase capacitance charging current is all non-electrical
Non-faulting phase capacitance charging current sum corresponding to resource loop is identical when capacitance charging current direction is with normal operation；Power supply
Loop fault loop fault phase capacitance charging current is all loop non-faulting phase capacitance charging current sums, capacitance charging current
It is opposite when direction is with normal operation；Therefore, it is possible to the charging capacitor electric current of each each phase of loop obtained by being calculated according to parameter
Size and Orientation, draws electric power loop failure phase.
4. the determination methods of Little Current Ground Connection System according to claim 1, it is characterised in that：The step（6）
It can be divided into through the breakdown judge in arc suppression coil system in neutral point：
J is in single supply multiloop neutral by arc extinction coil grounding system, using full compensation way, and single-phase connect occurs for line side
Earth fault；The supervision element alarm of power source bus residual voltage；Non-electrical resource loop non-faulting loop non-faulting phase capacitance charging current
Keep constant；Non-electrical resource loop non-faulting loop fault phase capacitance charging current is zero；Electric power loop non-faulting loop non-faulting
Phase capacitance charging current is the non-faulting phase capacitance charging current sum corresponding to all non-electrical resource loops；Capacitance charging current side
It is identical during to normal operation；Electric power loop non-faulting loop fault phase capacitance charging current is zero；Non-power loop fault is returned
Road non-faulting phase capacitance charging current keeps constant；Non-power loop fault loop fault phase capacitance charging current is zero；Therefore
It can not show which bar loop is fault loop in such cases, which bar loop is normal loop；And it can produce in such cases
Series resonance, improves arc suppression coil and connects neutral point voltage, actual motion never uses such a mode；
K is in single supply multiloop neutral by arc extinction coil grounding system, using undercompensation mode, and single-phase connect occurs for line side
Earth fault；The supervision element alarm of power source bus residual voltage；Non-electrical resource loop non-faulting loop non-faulting phase capacitance charging current
Keep constant；Non-electrical resource loop non-faulting loop fault phase capacitance charging current is zero；Electric power loop non-faulting loop non-faulting
Phase capacitance charging current is the non-faulting phase capacitance charging current sum corresponding to all non-electrical resource loops, capacitance charging current side
It is identical during to normal operation；Electric power loop fault loop failure phase capacitance charging current is that all loop non-faulting phase electric capacity fill
Electric current sum again and arc suppression coil compensation inductive current difference, it is opposite when capacitance charging current direction is with normal operation；Non-electrical
Resource loop fault loop non-faulting phase capacitance charging current keeps constant；Non-power loop fault loop fault phase electric capacity charging electricity
Flow for all loop non-faulting phase capacitance charging current sums again and arc suppression coil compensation inductive current difference；Capacitance charging current
It is opposite when direction is with normal operation；Therefore in such cases, fault loop failure phase capacitance charging current parameter is calculated
As a result negative value is should be, normal mutually in opposite direction with faulted phase current, other are mutually all different with other loops, so can
Measure fault loop failure phase；But in the case of being due to some line outages, because of the reduction of transmission line capacitor, joint performance is turned into
Full compensation, therefore typically such a compensation way is not used；
L is in single supply multiloop neutral by arc extinction coil grounding system, using overcompensation mode, and single-phase connect occurs for line side
Earth fault；The supervision element alarm of power source bus residual voltage；Non-electrical resource loop non-faulting loop non-faulting phase capacitance charging current
Keep constant；Non-electrical resource loop non-faulting loop fault phase capacitance charging current is zero；Electric power loop non-faulting loop non-faulting
Phase capacitance charging current is the non-faulting phase capacitance charging current sum corresponding to all non-electrical resource loops；Capacitance charging current side
It is identical during to normal operation；Electric power loop non-faulting loop fault phase capacitance charging current is all loop non-faulting phase electric capacity
Charging current sum again and arc suppression coil compensation inductive current difference；It is identical when capacitance charging current direction is with normal operation；It is non-
Electric power loop fault loop non-faulting phase capacitance charging current keeps constant；Non-power loop fault loop fault phase electric capacity charges
Electric current be all loop non-faulting phase capacitance charging current sums again and arc suppression coil compensation inductive current difference；Electric capacity charging electricity
It is identical when flowing direction with normal operation；Therefore in such cases, fault loop failure phase capacitance charging current parameter is calculated
Result should be on the occasion of；In general, although fault loop is identical with non-faulting tank capacitance charging current direction, by
It is fixed in compensativity, this capacitance charging current is far longer than the normal phase capacitance charging current in normal loop under normal circumstances,
Other are mutually all different with other loops, can so measure fault loop failure phase；Only with System Development, go out in system
The increase of line loop number, when capacitance charging current is equal to arc suppression coil compensation inductive current, just occurs situation about can not judge,
And such a method of operation is the full compensation method of operation, intermediate distribution system never takes such a method of operation；Therefore, it is possible to judge
Be out of order loop fault phase；
M is in single supply multiloop neutral by arc extinction coil grounding system, using overcompensation mode, and single-phase connect occurs for mains side
Earth fault；Because full compensation circuit and undercompensation circuit are not used in actual applications, therefore only consider over compensation operation mode
Situation；The supervision element alarm of power source bus residual voltage；Non-electrical resource loop non-faulting loop non-faulting phase capacitance charging current
Keep constant；Non-electrical resource loop non-faulting loop fault phase capacitance charging current is zero；Electric power loop fault loop non-faulting phase
Capacitance charging current is the non-faulting phase capacitance charging current sum corresponding to all non-electrical resource loops；Capacitance charging current direction
It is identical during with normal operation；Electric power loop fault loop failure phase capacitance charging current charges for all loop non-faulting phase electric capacity
Electric current sum again and arc suppression coil compensation inductive current difference；It is identical when capacitance charging current direction is with normal operation；Therefore this
Kind in the case of, the result that fault loop failure phase capacitance charging current parameter is calculated should be on the occasion of；In general,
Because compensativity is fixed, this capacitance charging current is far longer than the normal phase electric capacity charging electricity in normal loop under normal circumstances
Stream, other are mutually all different with other loops, can so measure fault loop failure phase；Only with System Development, system
Interior transmission line circuit number increase, when capacitance charging current is equal to arc suppression coil compensation inductive current, just occurs what can not be judged
Situation, and such a method of operation is the full compensation method of operation, intermediate distribution system never takes such a method of operation；Therefore can be with
Judge fault loop failure phase.
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| CN108448561A (en) * | 2018-02-24 | 2018-08-24 | 上海合凯电气科技有限公司 | It is a kind of to prevent two differently short-circuit high-speed switch arc-extinction devices |
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| CN109884476B (en) * | 2019-04-18 | 2020-12-29 | 广东电网有限责任公司 | Method for judging fault direction of tie line suitable for double-fed power access |
| CN110488154B (en) * | 2019-08-28 | 2021-06-22 | 国网四川省电力公司成都供电公司 | Low-current grounding line selection method for dispatching master station end |
| CN112415425B (en) * | 2020-11-16 | 2021-08-20 | 贵州电网有限责任公司 | Small-current single-phase earth fault detection method for 10KV distribution network |
| CN115078904A (en) * | 2022-06-08 | 2022-09-20 | 国网湖北省电力有限公司鄂州供电公司 | Fault line selection method based on improved deep neural network |
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