CN103852693A - Judging method of small current grounding line selection system - Google Patents
Judging method of small current grounding line selection system Download PDFInfo
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Abstract
The invention provides a judging method of a small current grounding line selection system. The judging method comprises the following steps: modeling a medium voltage distribution network, judging the directions of active power and reactive power, parameters of call lines and voltage and phase angles of different medium points, judging whether faults happen to the difference of values of parameters of the call lines and values calculated by checking a lead parameter table, judging faults of an isolated neutral system, and judging faults of an arc suppression coil system at a neutral point. The judging method has the beneficial effects that the accuracy of a small current grounding line selection function is greatly improved, the fault loop and the fault phase can be accurately positioned before the faults are further developed into two-phase faults or three-phase faults, and the condition that when a conventional loop power off method is adopted, relevant loops of the faults are respectively powered off once is avoided, and therefore, the power outage time is shortened, and the power supply reliability is improved.
Description
technical field
The present invention relates to a kind of medium-voltage distribution technical field, relate in particular to a kind of determination methods of Little Current Ground Connection System.
Background technology
In medium voltage distribution network, what earthed system generally adopted is in small current neutral grounding system, wherein small current neutral grounding system is divided into isolated neutral system and neutral by arc extinction coil grounding system, and wherein isolated neutral system is the neutral grounding mode of extensively promoting in current medium voltage network.And the earthing mode of neutral by arc extinction coil grounding is slowly being eliminated.
Singlephase earth fault accounts for the more than 90% of all earth fault probability of happening of all electric system, in small current neutral grounding system, while there is this fault, can operate with failure 2 hours, and this kind of method of operation power supply reliability is higher.
In traditional Little Current Ground Connection System, due to the singularity of small current neutral grounding system, (zero-sequence current of small current neutral grounding system is exactly transmission line capacitor electric current, because the existing active energy of the electric energy of transmission line, there is again reactive energy, therefore transmission line capacitor electric current is a very little part for the reactive energy that transmits on transmission line, traditional detection method cannot detect the increment of charging capacitor electric current on transmission line at all, therefore judge that small current earthing wire-selecting is by some not too reliable indexs substantially, therefore this problem is one of several large unsolved problems of electric system always), judgment accuracy less than 50%, under some extreme condition, judgment accuracy less than 20%.Therefore for the judgment accuracy of small current earthing wire-selecting method, also has the space of larger lifting.
Summary of the invention
The object of the invention is to solve in MV distribution systems, because piezoelectricity in most of medium-voltage distribution room is in traditional Little Current Ground Connection System, because the zero-sequence current of the singularity small current neutral grounding system of small current neutral grounding system is exactly transmission line capacitor electric current, because the existing active energy of the electric energy of transmission line, there is again reactive energy, therefore transmission line capacitor electric current is a very little part for the reactive energy that transmits on transmission line, traditional detection method cannot detect the increment of charging capacitor electric current on transmission line at all, therefore judge that small current earthing wire-selecting is by some not too reliable indexs substantially, the deficiency that judgment accuracy is low and the determination methods of a kind of novel Little Current Ground Connection System that provides.
The present invention is achieved through the following technical solutions: a kind of determination methods of Little Current Ground Connection System, comprises that step is as follows:
(1) medium voltage distribution network is carried out to modeling, this step can be with reference to the method for number of patent application: a 201410086502.0(medium voltage distribution network transmission line model)
(2) judge active power and reactive power direction according to medium-voltage distribution pessimistic concurrency control in step (1), this step can be 201310204650.2(method of discrimination of observing the method for two-dimentional law of conservation energy with reference to number of patent application) patented claim;
(3) according to parameter and each middle point voltage size and phase angle of judge active power and each interconnection of reactive power direction calculating in step (2), this step can be 201310484430.0(power distribution network calculation method of parameters with reference to number of patent application) patented claim;
(4) judge whether to there is fault according to the value of calculating each interconnection parameter getting in step (3) with the gap of the value of looking into the calculating of wire parameter list, if the value of described each interconnection parameter with look into value difference that wire parameter list calculates apart from large and the equal duty of each equipment is normal, explanation is broken down;
(5) judgement of the fault in isolated neutral system;
(6) judgement of the fault in arc suppression coil system at neutral point.
Further, in described step (4), the judgement of the reason of fault is as follows: wire active loss increases the situation more than other wires, and contact resistance is excessive or have virtual connection phenomenon, belongs to contact loss, causes the improper rising of line resistance; If active power loss has significantly undesired increase; leakage loss has been described; may there is three-phase shortcircuit, line to line fault; the generation path of the faults such as two phase ground short circuit; but now fault loop does not occur to puncture on a large scale; only have some leakage losses, fault still, in early stage, need to be got rid of early.
Further, the fault judgement of described step (5) in isolated neutral system can be divided into: (1), in single supply single line isolated neutral system, singlephase earth fault occurs; The supervisory element of residual voltage is reported to the police; Fault loop fault phase is healthy phases capacitor charging electric current
doubly; Fault loop healthy phases is non-fault loop normal phase capacitor charging electric current
doubly; Non-fault loop normal phase capacitor charging electric current can calculate according to wire parameter list; Therefore the medium voltage distribution network parameter values that modeling draws according to single supply single loop is that non-fault loop is while normally moving
doubly or 3 times, and fault loop fault phase and healthy phases capacitor charging current opposite in direction, can judge single supply single loop small current neutral grounding system generation singlephase earth fault;
(2), in single supply multiloop isolated neutral system, there is singlephase earth fault in line side; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; The non-fault loop healthy phases of electric power loop capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; The non-fault loop fault phase of electric power loop capacitor charging electric current is all loops healthy phases capacitor charging electric current sums; Capacitor charging direction of current is contrary during with normal operation; Non-electric power loop fault loop healthy phases capacitor charging electric current remains unchanged; Non-electric power loop fault loop fault phase capacitor charging electric current is that all loops healthy phases electric capacity is from an electric current sum; Capacitor charging direction of current is contrary during with normal operation; Therefore can, according to the size and Orientation of the charging capacitor electric current of each each phase of loop of calculation of parameter gained, draw fault loop fault phase.
(3), in single supply multiloop isolated neutral system, power supply is surveyed singlephase earth fault is occurred; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; Electric power loop fault loop healthy phases capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; Electric power loop fault loop fault phase capacitor charging electric current is all loops healthy phases capacitor charging electric current sums; Capacitor charging direction of current is contrary during with normal operation; Therefore can, according to the size and Orientation of the charging capacitor electric current of each each phase of loop of calculation of parameter gained, draw electric power loop fault phase.
Further, at neutral point, the judgement of the fault in arc suppression coil system can be divided into described step (6): (1), in single supply multiloop neutral by arc extinction coil grounding system, adopts full compensation way, and singlephase earth fault occurs in line side; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; The non-fault loop healthy phases of electric power loop capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; The non-fault loop fault phase of electric power loop capacitor charging electric current is zero; Non-electric power loop fault loop healthy phases capacitor charging electric current remains unchanged; Non-electric power loop fault loop fault phase capacitor charging electric current is zero; Therefore cannot show in such cases which bar loop is fault loop, which bar loop is normal loop; And can produce in such cases series resonance, improve neutral point voltage that arc suppression coil connects, actual motion never adopts this kind of mode;
(2) in single supply multiloop neutral by arc extinction coil grounding system, adopt under-compensation mode, there is singlephase earth fault in line side; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; The non-fault loop healthy phases of electric power loop capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum.Capacitor charging direction of current is identical during with normal operation; Electric power loop fault loop fault phase capacitor charging electric current is all loops healthy phases capacitor charging electric current sum poor with arc suppression coil compensation inductive current again.Capacitor charging direction of current is contrary during with normal operation; Non-electric power loop fault loop healthy phases capacitor charging electric current remains unchanged; Non-electric power loop fault loop fault phase capacitor charging electric current be all loops healthy phases electric capacity from an electric current sum poor with arc suppression coil compensation inductive current again; Capacitor charging direction of current is contrary during with normal operation; Therefore in such cases, the result that fault loop fault phase capacitor charging current parameters calculates should be negative value, and normal phase and fault phase current opposite in direction are all different with other phases of other loops, can measure like this fault loop fault phase; But due to meeting in the situation of some line outage, due to the minimizing of transmission line capacitor, can develop into as full compensation, therefore generally not adopt this kind of compensation way;
(3) in single supply multiloop neutral by arc extinction coil grounding system, adopt over-compensation mode, there is singlephase earth fault in line side; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; The non-fault loop healthy phases of electric power loop capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; The non-fault loop fault phase of electric power loop capacitor charging electric current is all loops healthy phases capacitor charging electric current sum poor with arc suppression coil compensation inductive current again; Capacitor charging direction of current is identical during with normal operation; Non-electric power loop fault loop healthy phases capacitor charging electric current remains unchanged; Non-electric power loop fault loop fault phase capacitor charging electric current be all loops healthy phases electric capacity from an electric current sum poor with arc suppression coil compensation inductive current again; Capacitor charging direction of current is identical during with normal operation; Therefore the result that in such cases, fault loop fault phase capacitor charging current parameters calculates should be on the occasion of; In the ordinary course of things, although fault loop is identical with non-fault loop capacitor charging direction of current; Because compensativity is fixed, this capacitor charging electric current is far longer than normal loop normal phase capacitor charging electric current under normal circumstances, all different with other phases of other loops, can measure like this fault loop fault phase; Only with System Development, in system, transmission line circuit number increases, and in the time that capacitor charging electric current equals arc suppression coil compensation inductive current, just there will be the situation that cannot judge, and this kind of method of operation is the full compensation method of operation, intermediate distribution system is never taked this kind of method of operation; Therefore can judge fault loop fault phase;
(4), in single supply multiloop neutral by arc extinction coil grounding system, adopt over-compensation mode, mains side generation singlephase earth fault; Because full compensating circuit and under-compensation circuit do not adopt in actual applications, therefore only consider the situation of over compensation operation mode; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; Electric power loop fault loop healthy phases capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; Electric power loop fault loop fault phase capacitor charging electric current is all loops healthy phases capacitor charging electric current sum poor with arc suppression coil compensation inductive current again; Capacitor charging direction of current is identical during with normal operation; Therefore the result that in such cases, fault loop fault phase capacitor charging current parameters calculates should be on the occasion of; In the ordinary course of things, because compensativity is fixed, this capacitor charging electric current is far longer than normal loop normal phase capacitor charging electric current under normal circumstances, all different with other phases of other loops, can measure like this fault loop fault phase; Only with System Development, in system, transmission line circuit number increases, and in the time that capacitor charging electric current equals arc suppression coil compensation inductive current, just there will be the situation that cannot judge, and this kind of method of operation is the full compensation method of operation, intermediate distribution system is never taked this kind of method of operation; Therefore can judge fault loop fault phase.
Beneficial effect of the present invention is: can make small current earthing wire-selecting function increase substantially accuracy rate, reach in fault and further develop and become phase to phase fault even before three-phase fault, can locate accurately fault loop fault phase, thereby avoid adopting traditional open line method, make the each power failure of each fault associated loop once, thereby reduce power off time, increased power supply reliability.
Accompanying drawing explanation
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 fail structural representation of the present invention;
Fig. 6 is single supply multi-line neutral by arc extinction coil grounding system normal condition 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 drawings and the specific embodiments, the present invention is described further:
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, a kind of determination methods of Little Current Ground Connection System, comprises that step is as follows:
(1) medium voltage distribution network is carried out to modeling, this step can be the method for a 201410086502.0(medium voltage distribution network transmission line model with reference to number of patent application) patented claim;
(2) judge active power and reactive power direction according to medium-voltage distribution pessimistic concurrency control in step (1), this step can be 201310204650.2(method of discrimination of observing the method for two-dimentional law of conservation energy with reference to number of patent application) patented claim;
(3) according to parameter and each middle point voltage size and phase angle of judge active power and each interconnection of reactive power direction calculating in step (2), this step can be 201310484430.0(power distribution network calculation method of parameters with reference to number of patent application) patented claim;
(4) judge whether to there is fault according to the value of calculating each interconnection parameter getting in step (3) with the gap of the value of looking into the calculating of wire parameter list, if the value of described each interconnection parameter with look into value difference that wire parameter list calculates apart from large and the equal duty of each equipment is normal, explanation is broken down;
(5) judgement of the fault in isolated neutral system;
(6) judgement of the fault in arc suppression coil system at neutral point.
Further, in described step (4), the judgement of the reason of fault is as follows: wire active loss increases the situation more than other wires, and contact resistance is excessive or have virtual connection phenomenon, belongs to contact loss, causes the improper rising of line resistance; If active power loss has significantly undesired increase; leakage loss has been described; may there is three-phase shortcircuit, line to line fault; the generation path of the faults such as two phase ground short circuit; but now fault loop does not occur to puncture on a large scale; only have some leakage losses, fault still, in early stage, need to be got rid of early.
Further, the fault judgement of described step (5) in isolated neutral system can be divided into: (1), in single supply single line isolated neutral system, singlephase earth fault occurs; The supervisory element of residual voltage is reported to the police; Fault loop fault phase is healthy phases capacitor charging electric current
doubly; Fault loop healthy phases is non-fault loop normal phase capacitor charging electric current
doubly; Non-fault loop normal phase capacitor charging electric current can calculate according to wire parameter list; Therefore the medium voltage distribution network parameter values that modeling draws according to single supply single loop is that non-fault loop is while normally moving
doubly or 3 times, and fault loop fault phase and healthy phases capacitor charging current opposite in direction, can judge single supply single loop small current neutral grounding system generation singlephase earth fault;
(2), in single supply multiloop isolated neutral system, there is singlephase earth fault in line side; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; The non-fault loop healthy phases of electric power loop capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; The non-fault loop fault phase of electric power loop capacitor charging electric current is all loops healthy phases capacitor charging electric current sums; Capacitor charging direction of current is contrary during with normal operation; Non-electric power loop fault loop healthy phases capacitor charging electric current remains unchanged; Non-electric power loop fault loop fault phase capacitor charging electric current is that all loops healthy phases electric capacity is from an electric current sum; Capacitor charging direction of current is contrary during with normal operation; Therefore can, according to the size and Orientation of the charging capacitor electric current of each each phase of loop of calculation of parameter gained, draw fault loop fault phase.
(3), in single supply multiloop isolated neutral system, power supply is surveyed singlephase earth fault is occurred; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; Electric power loop fault loop healthy phases capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; Electric power loop fault loop fault phase capacitor charging electric current is all loops healthy phases capacitor charging electric current sums; Capacitor charging direction of current is contrary during with normal operation; Therefore can, according to the size and Orientation of the charging capacitor electric current of each each phase of loop of calculation of parameter gained, draw electric power loop fault phase.
Further, at neutral point, the judgement of the fault in arc suppression coil system can be divided into described step (6):
(1) in single supply multiloop neutral by arc extinction coil grounding system, adopting full compensation way, there is singlephase earth fault in line side; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; The non-fault loop healthy phases of electric power loop capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; The non-fault loop fault phase of electric power loop capacitor charging electric current is zero; Non-electric power loop fault loop healthy phases capacitor charging electric current remains unchanged; Non-electric power loop fault loop fault phase capacitor charging electric current is zero; Therefore cannot show in such cases which bar loop is fault loop, which bar loop is normal loop; And can produce in such cases series resonance, improve neutral point voltage that arc suppression coil connects, actual motion never adopts this kind of mode;
(2) in single supply multiloop neutral by arc extinction coil grounding system, adopt under-compensation mode, there is singlephase earth fault in line side; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; The non-fault loop healthy phases of electric power loop capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum.Capacitor charging direction of current is identical during with normal operation; Electric power loop fault loop fault phase capacitor charging electric current is all loops healthy phases capacitor charging electric current sum poor with arc suppression coil compensation inductive current again.Capacitor charging direction of current is contrary during with normal operation; Non-electric power loop fault loop healthy phases capacitor charging electric current remains unchanged; Non-electric power loop fault loop fault phase capacitor charging electric current be all loops healthy phases electric capacity from an electric current sum poor with arc suppression coil compensation inductive current again; Capacitor charging direction of current is contrary during with normal operation; Therefore in such cases, the result that fault loop fault phase capacitor charging current parameters calculates should be negative value, and normal phase and fault phase current opposite in direction are all different with other phases of other loops, can measure like this fault loop fault phase; But due to meeting in the situation of some line outage, due to the minimizing of transmission line capacitor, can develop into as full compensation, therefore generally not adopt this kind of compensation way;
(3) in single supply multiloop neutral by arc extinction coil grounding system, adopt over-compensation mode, there is singlephase earth fault in line side; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; The non-fault loop healthy phases of electric power loop capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; The non-fault loop fault phase of electric power loop capacitor charging electric current is all loops healthy phases capacitor charging electric current sum poor with arc suppression coil compensation inductive current again; Capacitor charging direction of current is identical during with normal operation; Non-electric power loop fault loop healthy phases capacitor charging electric current remains unchanged; Non-electric power loop fault loop fault phase capacitor charging electric current be all loops healthy phases electric capacity from an electric current sum poor with arc suppression coil compensation inductive current again; Capacitor charging direction of current is identical during with normal operation; Therefore the result that in such cases, fault loop fault phase capacitor charging current parameters calculates should be on the occasion of; In the ordinary course of things, although fault loop is identical with non-fault loop capacitor charging direction of current; Because compensativity is fixed, this capacitor charging electric current is far longer than normal loop normal phase capacitor charging electric current under normal circumstances, all different with other phases of other loops, can measure like this fault loop fault phase; Only with System Development, in system, transmission line circuit number increases, and in the time that capacitor charging electric current equals arc suppression coil compensation inductive current, just there will be the situation that cannot judge, and this kind of method of operation is the full compensation method of operation, intermediate distribution system is never taked this kind of method of operation; Therefore can judge fault loop fault phase;
(4), in single supply multiloop neutral by arc extinction coil grounding system, adopt over-compensation mode, mains side generation singlephase earth fault; Because full compensating circuit and under-compensation circuit do not adopt in actual applications, therefore only consider the situation of over compensation operation mode; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; Electric power loop fault loop healthy phases capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; Electric power loop fault loop fault phase capacitor charging electric current is all loops healthy phases capacitor charging electric current sum poor with arc suppression coil compensation inductive current again; Capacitor charging direction of current is identical during with normal operation; Therefore the result that in such cases, fault loop fault phase capacitor charging current parameters calculates should be on the occasion of; In the ordinary course of things, because compensativity is fixed, this capacitor charging electric current is far longer than normal loop normal phase capacitor charging electric current under normal circumstances, all different with other phases of other loops, can measure like this fault loop fault phase; Only with System Development, in system, transmission line circuit number increases, and in the time that capacitor charging electric current equals arc suppression coil compensation inductive current, just there will be the situation that cannot judge, and this kind of method of operation is the full compensation method of operation, intermediate distribution system is never taked this kind of method of operation; Therefore can judge fault loop fault phase.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and modification to above-mentioned embodiment.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection domain of claim of the present invention modifications and changes more of the present invention.In addition,, although used some specific terms in this instructions, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (4)
1. a determination methods for Little Current Ground Connection System, is characterized in that, comprises the steps:
(1) medium voltage distribution network is carried out to modeling;
(2) judge active power and reactive power direction according to medium-voltage distribution pessimistic concurrency control in step (1);
(3) according to parameter and each middle point voltage size and phase angle of judging active power and each interconnection of reactive power direction calculating in step (2);
(4) judge whether to there is fault according to the value of calculating each interconnection parameter getting in step (3) with the gap of the value of looking into the calculating of wire parameter list, if the value of described each interconnection parameter with look into value difference that wire parameter list calculates apart from large and the equal duty of each equipment is normal, explanation is broken down;
(5) judgement of the fault in isolated neutral system;
(6) judgement of the fault in arc suppression coil system at neutral point.
2. the determination methods of Little Current Ground Connection System according to claim 1, it is characterized in that: in described step (4), the judgement of the reason of fault is as follows: wire active loss increases the situation more than other wires, contact resistance is excessive or have a virtual connection phenomenon, belong to contact loss, cause the improper rising of line resistance; If active power loss has significantly undesired increase; leakage loss has been described; may there is three-phase shortcircuit, line to line fault; the generation path of the faults such as two phase ground short circuit; but now fault loop does not occur to puncture on a large scale; only have some leakage losses, fault still, in early stage, need to be got rid of early.
3. the determination methods of Little Current Ground Connection System according to claim 1, is characterized in that: the fault judgement of described step (5) in isolated neutral system can be divided into:
In single supply single line isolated neutral system, there is singlephase earth fault; The supervisory element of residual voltage is reported to the police; Fault loop fault phase is healthy phases capacitor charging electric current
doubly; Fault loop healthy phases is non-fault loop normal phase capacitor charging electric current
doubly; Non-fault loop normal phase capacitor charging electric current can calculate according to wire parameter list; Therefore the medium voltage distribution network parameter values that modeling draws according to single supply single loop is that non-fault loop is while normally moving
doubly or 3 times, and fault loop fault phase and healthy phases capacitor charging current opposite in direction, can judge single supply single loop small current neutral grounding system generation singlephase earth fault;
(2), in single supply multiloop isolated neutral system, there is singlephase earth fault in line side; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; The non-fault loop healthy phases of electric power loop capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; The non-fault loop fault phase of electric power loop capacitor charging electric current is all loops healthy phases capacitor charging electric current sums; Capacitor charging direction of current is contrary during with normal operation; Non-electric power loop fault loop healthy phases capacitor charging electric current remains unchanged; Non-electric power loop fault loop fault phase capacitor charging electric current is that all loops healthy phases electric capacity is from an electric current sum;
Capacitor charging direction of current is contrary during with normal operation; Therefore can, according to the size and Orientation of the charging capacitor electric current of each each phase of loop of calculation of parameter gained, draw fault loop fault phase;
(3), in single supply multiloop isolated neutral system, power supply is surveyed singlephase earth fault is occurred; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; Electric power loop fault loop healthy phases capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum;
Capacitor charging direction of current is identical during with normal operation; Electric power loop fault loop fault phase capacitor charging electric current is all loops healthy phases capacitor charging electric current sums;
Capacitor charging direction of current is contrary during with normal operation; Therefore can, according to the size and Orientation of the charging capacitor electric current of each each phase of loop of calculation of parameter gained, draw electric power loop fault phase.
4. the determination methods of Little Current Ground Connection System according to claim 1, is characterized in that: at neutral point, the judgement of the fault in arc suppression coil system can be divided into described step (6):
(1) in single supply multiloop neutral by arc extinction coil grounding system, adopting full compensation way, there is singlephase earth fault in line side; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; The non-fault loop healthy phases of electric power loop capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; The non-fault loop fault phase of electric power loop capacitor charging electric current is zero; Non-electric power loop fault loop healthy phases capacitor charging electric current remains unchanged; Non-electric power loop fault loop fault phase capacitor charging electric current is zero; Therefore cannot show in such cases which bar loop is fault loop, which bar loop is normal loop; And can produce in such cases series resonance, improve neutral point voltage that arc suppression coil connects, actual motion never adopts this kind of mode;
(2) in single supply multiloop neutral by arc extinction coil grounding system, adopt under-compensation mode, there is singlephase earth fault in line side; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; The non-fault loop healthy phases of electric power loop capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum;
Capacitor charging direction of current is identical during with normal operation; Electric power loop fault loop fault phase capacitor charging electric current is all loops healthy phases capacitor charging electric current sum poor with arc suppression coil compensation inductive current again;
Capacitor charging direction of current is contrary during with normal operation; Non-electric power loop fault loop healthy phases capacitor charging electric current remains unchanged; Non-electric power loop fault loop fault phase capacitor charging electric current be all loops healthy phases electric capacity from an electric current sum poor with arc suppression coil compensation inductive current again; Capacitor charging direction of current is contrary during with normal operation; Therefore in such cases, the result that fault loop fault phase capacitor charging current parameters calculates should be negative value, and normal phase and fault phase current opposite in direction are all different with other phases of other loops, can measure like this fault loop fault phase; But due to meeting in the situation of some line outage, due to the minimizing of transmission line capacitor, can develop into as full compensation, therefore generally not adopt this kind of compensation way;
(3) in single supply multiloop neutral by arc extinction coil grounding system, adopt over-compensation mode, there is singlephase earth fault in line side; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; The non-fault loop healthy phases of electric power loop capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; The non-fault loop fault phase of electric power loop capacitor charging electric current is all loops healthy phases capacitor charging electric current sum poor with arc suppression coil compensation inductive current again; Capacitor charging direction of current is identical during with normal operation; Non-electric power loop fault loop healthy phases capacitor charging electric current remains unchanged; Non-electric power loop fault loop fault phase capacitor charging electric current be all loops healthy phases electric capacity from an electric current sum poor with arc suppression coil compensation inductive current again; Capacitor charging direction of current is identical during with normal operation; Therefore the result that in such cases, fault loop fault phase capacitor charging current parameters calculates should be on the occasion of; In the ordinary course of things, although fault loop is identical with non-fault loop capacitor charging direction of current; Because compensativity is fixed, this capacitor charging electric current is far longer than normal loop normal phase capacitor charging electric current under normal circumstances, all different with other phases of other loops, can measure like this fault loop fault phase; Only with System Development, in system, transmission line circuit number increases, and in the time that capacitor charging electric current equals arc suppression coil compensation inductive current, just there will be the situation that cannot judge, and this kind of method of operation is the full compensation method of operation, intermediate distribution system is never taked this kind of method of operation; Therefore can judge fault loop fault phase;
(4), in single supply multiloop neutral by arc extinction coil grounding system, adopt over-compensation mode, mains side generation singlephase earth fault; Because full compensating circuit and under-compensation circuit do not adopt in actual applications, therefore only consider the situation of over compensation operation mode; Power source bus residual voltage supervision element is reported to the police; The non-fault loop healthy phases of non-electric power loop capacitor charging electric current remains unchanged; The non-fault loop fault phase of non-electric power loop capacitor charging electric current is zero; Electric power loop fault loop healthy phases capacitor charging electric current is the corresponding healthy phases capacitor charging of all non-electric power loops electric current sum; Capacitor charging direction of current is identical during with normal operation; Electric power loop fault loop fault phase capacitor charging electric current is all loops healthy phases capacitor charging electric current sum poor with arc suppression coil compensation inductive current again; Capacitor charging direction of current is identical during with normal operation; Therefore the result that in such cases, fault loop fault phase capacitor charging current parameters calculates should be on the occasion of; In the ordinary course of things, because compensativity is fixed, this capacitor charging electric current is far longer than normal loop normal phase capacitor charging electric current under normal circumstances, all different with other phases of other loops, can measure like this fault loop fault phase; Only with System Development, in system, transmission line circuit number increases, and in the time that capacitor charging electric current equals arc suppression coil compensation inductive current, just there will be the situation that cannot judge, and this kind of method of operation is the full compensation method of operation, intermediate distribution system is never taked this kind of method of operation; Therefore can judge fault loop fault phase.
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