CN103760465A - Single-phase earth fault direction judgment and processing method of small current grounding system - Google Patents
Single-phase earth fault direction judgment and processing method of small current grounding system Download PDFInfo
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Abstract
The invention relates to a single-phase earth fault direction judgment and processing method of a small current grounding system. In terms of a fault direction judgment method, the session which a single-phase fault point belongs to on a main line is judged according to zero-sequence currents, zero-sequence voltage and the included angle relation between the zero-sequence currents and the zero-sequence voltage tested through a section switch on the main line where a single-phase earth fault occurs, the fault session is isolated according to the judgment result, and normal power supply of a non-fault session line is guaranteed to the largest extent. According to the judgment and processing method, the single-phase earth fault session of the main line can be automatically isolated, and power supply reliability of a power distribution network is improved; additionally, according to the single-phase grounding direction judgment method, a main line boundary function is embedded in the section switch of a 10kV feeder line, the range in power failure caused by the single-phase earth fault can be shortened to the largest extent, and accordingly reliability and safety of power supply are improved.
Description
Technical field
The present invention relates to a kind of single-phase grounded malfunction in grounded system of low current discriminating direction and disposal route.
Background technology
China 10kV distribution system adopts the method for operation (small current neutral grounding system)-be that isolated neutral or the neutral by arc extinction coil grounding method of operation are in the majority of neutral point indirect earthing, in the power distribution network of the neutral point indirect earthing method of operation, single-phase earthing is a kind of most common failure, particularly, under the severe weather conditions such as rainy season, strong wind, singlephase earth fault frequently occurs especially.
Small current neutral grounding system has occurred after singlephase earth fault, and fault phase voltage-to-ground reduces, and the phase voltage over the ground of non-fault two-phase raises, but line voltage is still symmetrical, thereby do not affect the continuous power supply to user, and system can be moved 1～2h, and this is also the great advantage of small current neutral grounding system; But, if there is electrical network long-play after singlephase earth fault, can have a strong impact on the safety and economic operation of converting equipment and power distribution network.How to determine fast position the isolated fault rapidly of 10kV distribution circuit single-phase earth fault, recover early the power supply to user, the safe operation of power distribution network is played to vital effect.
At present, the high pressure main transformer 10kV side neutral point major part of most domestic high voltage substation is all earth-free or grounding through arc, there are one section (being generally a main transformer) or two sections of buses (being generally two main transformers) in a general transformer station, every section of 10kV bus is all equipped with a set of Little Current Ground Connection System, only can inform it is that singlephase earth fault has occurred which bar 10kV feeder line in transformer station, then rely on the mode of manually operating a switch that whole piece 10kV feeder line is had a power failure rather than only the fault zone on this feeder line have a power failure, in the hope of guaranteeing that safe power supply of the 10kV feeder line of singlephase earth fault does not occur for other, cover tens of feeder lines of one section of 10kV bus.Owing to not using the block switch with backbone singlephase earth fault boundary function on 10kV feeder line, so judge that the task of singlephase earth fault on backbone can only rely on the Small Electric Current Earthing And Routing Device of transformer station.When a certain feeder line occurred after singlephase earth fault, transformer station can only rely on installation Little Current Ground Connection System in the inner and carry out the selection of singlephase earth fault circuit.According to the practical operation situation of small current line selection equipment, route selection accuracy rate is substantially 40%～60%, the singlephase earth fault that is to say nearly half is to rely on manually one by one drawing outlet switch to carry out in the processing of transformer station, certain singlephase earth fault section in the power failure of whole piece 10kV feeder line rather than this feeder line of the singlephase earth fault that not only can cause generation like this has a power failure, also can cause an innocent person of many other non-fault 10kV feeder lines to have a power failure in short-term simultaneously, bring unnecessary puzzlement to vast electricity consumption user's normal electricity consumption.Even Little Current Ground Connection System route selection is correct, best result is also the manually indication according to line-selected earthing device, and the 10kV feeder line of singlephase earth fault has occurred artificial separating brake whole piece, and power failure area is large.
User demarcation switch or user demarcation isolating switch are all progressively being promoted the use of in domestic many areas, its object is: while there is singlephase earth fault on user's branch line of 10kV feeder line, can from major network, automatically separate in time, not affect the normal operation of major network and other branch line user during the load side generation singlephase earth fault of demarcation switch.But in actual application process, user demarcation switch or user demarcation isolating switch often there will be tripping or touch situation, cannot realize in good condition use original intention; Automatic fault segments apart when in addition, user demarcation switch and demarcation circuit breaker cannot be shouldered, on 10kV power distribution network backbone, singlephase earth fault occur, recover the mission of non-fault section normal power supply.Reason is just that user demarcation switch or demarcation circuit breaker judge whether to occur that singlephase earth fault is only according to this unique criterion of the size of zero-sequence current value.Because singlephase earth fault type is more, there are metallic earthing, arc grounding, high resistance ground etc., different singlephase earth fault type zero-sequence current values has very big-difference; And if very also long or be also the circuit of cable combination with the branch line that demarcation switch or demarcation circuit breaker are installed, the capacitance current of branch line may to add the capacitance current of other branch lines suitable with backbone, now only according to the size of zero-sequence current value, as the judgement of ground connection direction, cannot guarantee accuracy of judgement degree.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, a kind of single-phase grounded malfunction in grounded system of low current discriminating direction method is provided, to overcome, the singlephase earth fault basis for estimation that prior art exists is not accurate enough, the fault discovery problem such as more not in time.
Object of the present invention realizes by following technical solution:
Single-phase grounded malfunction in grounded system of low current discriminating direction method, is characterized in that: comprise the steps:
On a, certain feeder line in small current neutral grounding system, install some block switches, feeder line is divided into some sections of power supply sections, described block switch is built-in with zero-sequence current detecting device, residual voltage sensor and intelligent controller;
B, zero-sequence current detecting device detect zero-sequence current automatically, and the zero-sequence current data that record pass to intelligent controller after filtering, isolation processing; Residual voltage sensor detects residual voltage automatically, and the zero-sequence current data that record pass to intelligent controller after step-down, filtering and isolation processing; Intelligent controller carries out vector calculating and processing to zero-sequence current and residual voltage, obtain the lead angle of zero-sequence current, residual voltage, the leading residual voltage of zero-sequence current, and judge according to the lead angle of zero-sequence current, residual voltage, the leading residual voltage of zero-sequence current the section that singlephase earth fault occurs;
C, in isolated neutral system, when certain block switch detects that zero-sequence current is greater than the threshold value of setting, residual voltage and is greater than the threshold value of setting, if the lead angle of the leading residual voltage of zero-sequence current is 180～270 °, judge that earth fault occurs in the load side of this block switch; When the lead angle of the leading residual voltage of zero-sequence current is 0～90 °, judge that earth fault occurs in the mains side of this block switch;
In arc suppression coil earthing system, when certain block switch detects that zero-sequence current is greater than the threshold value of setting, residual voltage and is greater than the threshold value of setting, if the lead angle of the leading residual voltage of zero-sequence current is 90～270 °, judge that earth fault occurs in the load side of this block switch; When the lead angle of the leading residual voltage of zero-sequence current is 0～90 °, judge that earth fault occurs in the mains side of this block switch.
Further, described block switch is segmentation on-load switch or the section switch with backbone boundary function.
Further, the zero-sequence current detecting device of described block switch is zero sequence current mutual inductor or is arranged on A, B, C mutually respectively for the synthetic current transformer of zero-sequence current.
Further, the residual voltage sensor of described block switch be three for the synthetic impedance type voltage sensor of residual voltage.
Further, if arc suppression coil earthing system is in over-compensation state, when certain block switch detects that zero-sequence current is greater than the threshold value of setting, residual voltage and is greater than the threshold value of setting and the lead angle of the leading residual voltage of zero-sequence current and is 90～180 °, judge that earth fault occurs in the load side of this block switch.
Further, if arc suppression coil earthing system is in under-compensation state, when certain block switch detects that zero-sequence current is greater than the threshold value of setting, residual voltage and is greater than the threshold value of setting and the lead angle of the leading residual voltage of zero-sequence current and is 180～270 °, judge that earth fault occurs in the load side of this block switch.
Another object of the present invention is for the deficiencies in the prior art, a kind of single-phase grounded malfunction in grounded system of low current disposal route is provided, with overcome fault handling that prior art exists need manual operation, fault handling specific aim poor, often cause the problems such as large-area power-cuts situation, concrete scheme is as follows:
Single-phase grounded malfunction in grounded system of low current disposal route, it is characterized in that: be included on certain feeder line in small current neutral grounding system and install some block switches, feeder line is divided into some sections of power supply sections, it is other that each block switch all can be put residing side according to the arbitrary described single-phase earthing fault direction determination methods failure judgement of claim 1～6, the form that time-delay action when block switch load side singlephase earth fault is occurred is arranged to successively decrease successively along power flow, when singlephase earth fault occurs, detect that trouble spot point is positioned at the block switch preparation time delay separating brake of load side, cause that block switch separating brake of the most close Single-phase Ground Connection Failure, other block switch detects that singlephase earth fault disappears after the block switch separating brake of the most close Single-phase Ground Connection Failure, time delay timing auto zero, and detect that the block switch that Single-phase Ground Connection Failure is positioned at mains side is failure to actuate.
Single-phase grounded malfunction in grounded system of low current disposal route, described small current neutral grounding system is typical case's circuit hand in hand, comprise the first feeder line by transformer station outlet, by the second feeder line of another transformer station's outlet be connected to first, handle isolating switch between the second feeder terminal, it is characterized in that: first, on the second feeder line, all install some block switches, feeder line is divided into several power supply sections, it is other that each block switch all can be put residing side according to the arbitrary described single-phase earthing fault direction determination methods failure judgement of claim 1～6, the singlephase earth fault time-delay action of block switch is arranged to successively decrease successively along power flow, when there is singlephase earth fault on certain section of the first feeder line, detect that block switch that trouble spot is positioned at load side enters timing and prepares time delay separating brake, cause the block switch separating brake of close trouble spot, other is just at the block switch of timing after the block switch separating brake in the most close trouble spot, owing to detecting that singlephase earth fault disappears, stop time delay separating brake, timing auto zero, detect that the block switch that Single-phase Ground Connection Failure is positioned at mains side is failure to actuate, handle isolating switch detects one-sided decompression, after time delay, closes a floodgate, the first feeder line section after the second feeder line and Single-phase Ground Connection Failure reconstitutes handle feeder line new, still have singlephase earth fault at feeder line afterbody, and be also successively to successively decrease along power flow the actuation time of the time delay separating brake of the block switch on handle feeder line.When after handle breaker closing, all block switches on handle feeder line all detect that singlephase earth fault section is positioned at load side, cause the block switch separating brake of close trouble spot, other block switch stops time delay separating brake, timing auto zero owing to detecting that singlephase earth fault disappears after this block switch separating brake; The net result of fault handling is: make the both sides block switch separating brake of the most close singlephase earth fault section, by power section isolation of singlephase earth fault, other power supply area is normally worked.
Single-phase grounded malfunction in grounded system of low current treating apparatus, it is characterized in that: comprise and be divided into the some block switches on certain feeder line in small current neutral grounding system, described block switch is divided into some sections of power supply sections by feeder line, described block switch is built-in with zero-sequence current detecting device, residual voltage sensor and intelligent controller, the zero-sequence current detecting device of described block switch is zero sequence current mutual inductor or is arranged on A, B, C is each for the synthetic current transformer of zero-sequence current mutually, the residual voltage sensor of described block switch be three for the synthetic impedance type voltage sensor of residual voltage.
The present invention has following beneficial effect:
The invention provides single-phase earthing fault direction method of discrimination, adopt the intelligent block switch of backbone, block switch can be according to zero-sequence current value, whether residual voltage value exceedes the angle of setting between thresholding and residual voltage and zero-sequence current, differentiate accurately mains side or load side that Single-phase Ground Connection Failure occurs in this demarcation switch, thereby block switch is not only limited be applied to user's separation place, also can expand range of application to the backbone of 10kV, by the singlephase earth fault section of the block switch automatism isolation backbone with backbone singlephase earth fault boundary function, maximum magnitude ground guarantees the normal power supply of non-fault section, improve the power supply reliability of power distribution network.
In addition, the invention provides singlephase earth fault disposal route, adopt the intelligent block switch of backbone, can find in time the residing section position of Single-phase Ground Connection Failure and automatically it be separated to processing, fault handling efficiency effectively improves, effectively reduce singlephase earth fault and brought the probability that expands the generation of power failure area event, the power failure range that singlephase earth fault is caused dwindles to greatest extent, thereby improve power supply reliability and security, can safeguard better the Electrical Safety of vast power consumer.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 is the schematic equivalent circuit of the load side generation singlephase earth fault of certain demarcation switch on certain feeder line in 10kV arc suppression coil earthing system.
Fig. 2 is voltage vector-diagram when certain feeder line normally moves in 10kV small current neutral grounding system.
Fig. 3 is zero-sequence current and residual voltage polar plot when the load side A of certain demarcation switch mutually singlephase earth fault occurs on certain feeder line in arc suppression coil earthing system while disregarding resistive that line-to-ground presents.
Fig. 4 be on certain feeder line that (counts line-to-ground impedance) in real system certain demarcation switch the polar plot of load side A zero-sequence current and residual voltage while there is singlephase earth fault mutually.
Fig. 5 is load side generation singlephase earth fault and residual voltage and the zero-sequence current polar plot of system when over-compensation of certain demarcation switch on an arc suppression coil earthing system feeder line.
Fig. 6 is the polar plot of the load side generation singlephase earth fault of certain demarcation switch on an arc suppression coil earthing system feeder line and system residual voltage and zero-sequence current when under-compensation.
Fig. 7 is the schematic equivalent circuit of the mains side generation singlephase earth fault of certain demarcation switch on certain feeder line in arc suppression coil earthing system.
Fig. 8 is zero-sequence current and residual voltage polar plot when the mains side A of certain demarcation switch mutually singlephase earth fault occurs on certain feeder line in arc suppression coil earthing system.
Fig. 9 is a typical 10kV feeder line schematic diagram.
Figure 10 is the schematic equivalent circuit of the load side generation singlephase earth fault of certain demarcation switch on certain feeder line in isolated neutral system.
Figure 11 is zero-sequence current and residual voltage polar plot when the load side A of certain demarcation switch mutually singlephase earth fault occurs on a feeder line while disregarding resistive that line-to-ground presents in isolated neutral system.
Figure 12 be on certain feeder line that (counts line-to-ground impedance) in isolated neutral system certain demarcation switch the polar plot of load side A zero-sequence current and residual voltage while there is singlephase earth fault mutually.
Figure 13 is the schematic equivalent circuit of the mains side generation singlephase earth fault of certain demarcation switch on certain feeder line in isolated neutral system.
Figure 14 is zero-sequence current and residual voltage polar plot when the mains side A of certain demarcation switch mutually singlephase earth fault occurs on certain feeder line in isolated neutral system.
Embodiment
Single-phase grounded malfunction in grounded system of low current discriminating direction method, comprises the steps:
On the backbone of a, certain feeder line in small current neutral grounding system, install some block switches, feeder line is divided into some sections of power supply areas, block switch is on-load switch or the isolating switch with backbone singlephase earth fault boundary function, in it, be provided with zero-sequence current detecting device, residual voltage sensor and intelligent controller, zero-sequence current detecting device is zero sequence current mutual inductor ZCT or to be arranged on A, B, C each for the synthetic current transformer of zero-sequence current mutually, and A, B, C phase current mutual inductor are synthetic for zero-sequence current; Residual voltage sensor is three impedance type voltage sensors synthesizing for residual voltage;
B, zero-sequence current detecting device detect zero-sequence current automatically, and the zero-sequence current data that record pass to intelligent controller after filtering, isolation processing; Residual voltage sensor detects residual voltage automatically, and the zero-sequence current data that record pass to intelligent controller after step-down, filtering and isolation processing; Intelligent controller carries out vector calculating and processing to zero-sequence current and residual voltage, obtain the lead angle of zero-sequence current, residual voltage, the leading residual voltage of zero-sequence current, and judge earth fault spot according to the lead angle of zero-sequence current, residual voltage, the leading residual voltage of zero-sequence current;
C, in isolated neutral system, when certain block switch detects that zero-sequence current is greater than the threshold value of setting, residual voltage and is greater than the threshold value of setting, if the lead angle of the leading residual voltage of zero-sequence current is 180～270 °, judge that earth fault occurs in the load side of this block switch; When the lead angle of the leading residual voltage of zero-sequence current is 0～90 °, judge that earth fault occurs in the mains side of this block switch;
In arc suppression coil earthing system, when certain block switch detects that zero-sequence current is greater than the threshold value of setting, residual voltage and is greater than the threshold value of setting, if the lead angle of the leading residual voltage of zero-sequence current is 90～270 °, judge that earth fault occurs in the load side of this block switch; When the lead angle of the leading residual voltage of zero-sequence current is 0～90 °, judge that earth fault occurs in the mains side of this block switch.
Single-phase grounded malfunction in grounded system of low current disposal route, be included on certain feeder line backbone in small current neutral grounding system and install some block switches, feeder line is divided into some sections of power supply areas, the side that every block switch all can judge singlephase earth fault is other, the form that block switch load side singlephase earth fault time-delay action is arranged to successively decrease successively along power flow, when singlephase earth fault occurs, detect that trouble spot is positioned at the block switch trigger separating brake timing of load side, cause the block switch separating brake (timing time is the shortest) of close trouble spot, other block switch stops the timing of time delay separating brake auto zero owing to detecting that singlephase earth fault disappears after the block switch separating brake of the most close trouble spot, detect that the block switch that trouble spot is positioned at mains side is failure to actuate.
Between zero-sequence current, residual voltage, the vector of angle calculates as described below:
(1) the load side generation singlephase earth fault of certain block switch, in compensated distribution network on certain feeder line backbone, as shown in Figure 1:
1, in theory during load side generation singlephase earth fault, with reference to Fig. 2,
With reference to Fig. 1, Fig. 3, the zero-sequence current value I now detecting from zero sequence current mutual inductor ZCT
0for:
2, in actual compensated distribution network during the load side generation singlephase earth fault of certain block switch on certain feeder line backbone
Continuation is with reference to Fig. 1, and when A mutually singlephase earth fault occurs, with reference to Fig. 4, residual voltage and zero-sequence current are as shown in following calculating, and on real system circuit, except pure inductance composition and ground capacitance composition, resistance resistance composition also exists simultaneously.While therefore considering resistance factors, the angle of the leading Va of capacitance current is greater than 90 °, and the angle of inductive current hysteresis Va is also greater than 90 °.
The vector correlation of residual voltage and zero-sequence current when arc suppression coil earthing system over-compensation and under-compensation, as shown in Figure 5, Figure 6.
From vector analysis figure, when certain block switch load side generation singlephase earth fault on a certain feeder line backbone of arc suppression coil earthing system, if system is in over-compensation state, the lead angle of the leading residual voltage of zero-sequence current in zero sequence current mutual inductor ZCT is 90 °～180 ° scopes; And the lead angle of system leading residual voltage of zero-sequence current in ZCT when under-compensation is 180 °～270 ° scopes.
In addition, during certain block switch load side generation singlephase earth fault on a certain feeder line backbone of isolated neutral system, in zero sequence current mutual inductor ZCT in block switch, the lead angle of the leading residual voltage of zero-sequence current and the under-compensation state of arc suppression coil earthing system are basic identical, refer to Figure 10,11,12.
(2) the mains side generation earth fault of certain block switch, in earth-free or compensated distribution network on certain feeder line backbone, as shown in Fig. 7 and Figure 13:
With reference to Fig. 7 and Figure 13, when mains side generation earth fault, capacitance current I
01cannot be detected by ZCT with inductive current IL, with reference to Fig. 8 and Figure 14, zero-sequence current value I
0for:
From above-mentioned calculating, when the mains side generation singlephase earth fault of certain block switch of certain feeder line in extinguishing arc line-to-ground system, the lead angle of the leading residual voltage of zero-sequence current in zero sequence current mutual inductor is 0 °～90 ° scopes.
Below in conjunction with embodiment, working method of the present invention is elaborated:
With reference to the circuit of handing in hand of this typical 10kV in Fig. 9, by the Article 10 10kV feeder line of the Article 2 10kV feeder line of the 10kV I section bus of No. 1 transformer station and the 10kV II section bus of No. 2 transformer stations, formed, at the end of two feeder lines with an isolating switch as handle isolating switch, form at present the common 10kV feeder line of handing in hand.Wherein DL1, DL2, DL3 are the isolating switch with backbone singlephase earth fault boundary function, and F1～F8 is the on-load switch with backbone singlephase earth fault boundary function.DL1, DL2, DL3, F1～F8 are referred to as block switch.
When normal, the 10kV I section bus of No. 1 transformer station is responsible for Article 2 10kV outlet from the outlet of No. 1 transformer station until the power supply in handle isolating switch DL3 upper extreme point region, and the trend of DL1, F1, F2, F3, F4, DL3 section is flowed to the upper extreme point of DL3 by No. 1 transformer station's outlet switch; The 10kV II section bus of No. 2 transformer stations is responsible for Article 10 10kV outlet from the outlet of No. 2 transformer stations until the power supply in handle isolating switch DL3 lower extreme point region, and the trend of DL2, F5, F6, F7, F8, DL3 section is flowed to the lower extreme point of DL3 by No. 2 transformer station's outlet switchs.
According to correlation standard, when 10kV feeder line generation singlephase earth fault, allow to operate with failure 1～2 hour.Each block switch DL1 on above-mentioned circuit, F1, F2, F3, F4, DL3, F8, F7, F6, F5, DL2, all can accurately judge that singlephase earth fault occurs in mains side or the load side of this TV station block switch, the time delay opening time of block switch when load side generation singlephase earth fault is set as follows table:
Suppose in normal power supply process when there is singlephase earth fault between F2 and F3 block switch, DL1, F1, F2 detect that singlephase earth fault has occurred load side, successively decrease successively the actuation time of the time delay separating brake of block switch along power flow, according to the operation time limit setting of upper table, F2 automatic brake separating during timing to 27 second after its load side generation singlephase earth fault, after F2 separating brake, F1 and DL1 stop timing and timing auto zero owing to then not detecting that at timing time singlephase earth fault disappears; And F3, F4 detect that mains side generation singlephase earth fault is both not-time, be also failure to actuate, now by DL1, F1, F2, form trend and flowed to by No. 1 transformer station's outlet switch the feeder line of the upper extreme point of F2.
DL3 is after F2 separating brake, at the one-sided decompression time-delay closing of predefined handle switch timing time, arrive rear combined floodgate, now by DL2, F5, F6, F7, F8, DL3, F3, F2 forms trend and is flowed to by No. 2 transformer station's outlet switchs the new feeder line of the lower extreme point of F2, when DL3 closes a floodgate, F3, F4, DL3, DL2, F5, F6, F7, F8 block switch detects that singlephase earth fault has occurred load side, time delay opening time during due to block switch load side generation singlephase earth fault successively decreases successively along power flow, according to the operation time limit setting of upper table, F3 is separating brake after 12 seconds, F4, DL3, DL2, F5, F6, F7, F8 stops owing to detecting that singlephase earth fault disappears that timing is failure to actuate and timing auto zero.
The other detection case table of singlephase earth fault side of this handle circuit when F2, F3 section generation singlephase earth fault:
So far, there is section F2 to the F3 section of singlephase earth fault automatically to have a power failure, other whole normal power supplies in non-fault zone.
The key that can above scheme realize is whether block switch accurately judges that singlephase earth fault occurs in its mains side or load side, and key point is the calculating of relation of the angle between residual voltage and zero-sequence current and definite accuracy.
The above, be only preferred embodiment of the present invention, therefore can not limit scope of the invention process with this, the equivalence of doing according to the present patent application the scope of the claims and description changes and modifies, and all should still remain within the scope of the patent.
Claims (10)
1. single-phase grounded malfunction in grounded system of low current discriminating direction method, is characterized in that: comprise the steps:
On a, certain feeder line in small current neutral grounding system, install some block switches, feeder line is divided into some sections of power supply sections, described block switch is built-in with zero-sequence current detecting device, residual voltage sensor and intelligent controller;
B, zero-sequence current detecting device detect zero-sequence current automatically, and the zero-sequence current data that record pass to intelligent controller after filtering, isolation processing; Residual voltage sensor detects residual voltage automatically, and the zero-sequence current data that record pass to intelligent controller after step-down, filtering and isolation processing; Intelligent controller carries out vector calculating and processing to zero-sequence current and residual voltage, obtain the lead angle of zero-sequence current, residual voltage, the leading residual voltage of zero-sequence current, and judge according to the lead angle of zero-sequence current, residual voltage, the leading residual voltage of zero-sequence current the section that singlephase earth fault occurs;
C, in isolated neutral system, when certain block switch detects that zero-sequence current is greater than the threshold value of setting, residual voltage and is greater than the threshold value of setting, if the lead angle of the leading residual voltage of zero-sequence current is 180～270 °, judge that earth fault occurs in the load side of this block switch; When the lead angle of the leading residual voltage of zero-sequence current is 0～90 °, judge that earth fault occurs in the mains side of this block switch;
In arc suppression coil earthing system, when certain block switch detects that zero-sequence current is greater than the threshold value of setting, residual voltage and is greater than the threshold value of setting, if the lead angle of the leading residual voltage of zero-sequence current is 90～270 °, judge that earth fault occurs in the load side of this block switch; When the lead angle of the leading residual voltage of zero-sequence current is 0～90 °, judge that earth fault occurs in the mains side of this block switch.
2. single-phase grounded malfunction in grounded system of low current discriminating direction method according to claim 1, is characterized in that: described block switch is segmentation on-load switch or the section switch with backbone boundary function.
3. single-phase grounded malfunction in grounded system of low current discriminating direction method according to claim 1, is characterized in that: the zero-sequence current detecting device of described block switch is zero sequence current mutual inductor or is arranged on A, B, C mutually respectively for the synthetic current transformer of zero-sequence current.
4. single-phase grounded malfunction in grounded system of low current discriminating direction method according to claim 1, is characterized in that: the residual voltage sensor of described block switch be three for the synthetic impedance type voltage sensor of residual voltage.
5. single-phase grounded malfunction in grounded system of low current discriminating direction method according to claim 1, it is characterized in that: if arc suppression coil earthing system is in over-compensation state, when certain block switch detects that zero-sequence current is greater than the threshold value of setting, residual voltage and is greater than the threshold value of setting and the lead angle of the leading residual voltage of zero-sequence current and is 90～180 °, judge that earth fault occurs in the load side of this block switch.
6. single-phase grounded malfunction in grounded system of low current discriminating direction method according to claim 1, it is characterized in that: if arc suppression coil earthing system is in under-compensation state, when certain block switch detects that zero-sequence current is greater than the threshold value of setting, residual voltage and is greater than the threshold value of setting and the lead angle of the leading residual voltage of zero-sequence current and is 180～270 °, judge that earth fault occurs in the load side of this block switch.
7. single-phase grounded malfunction in grounded system of low current disposal route, it is characterized in that: be included on certain feeder line in small current neutral grounding system and install some block switches, feeder line is divided into some sections of power supply sections, it is other that each block switch all can be put residing side according to the arbitrary described single-phase earthing fault direction determination methods failure judgement of claim 1～6, the form that time-delay action when block switch load side singlephase earth fault is occurred is arranged to successively decrease successively along power flow, when singlephase earth fault occurs, detect that trouble spot point is positioned at the block switch preparation time delay separating brake of load side, cause that block switch separating brake of the most close Single-phase Ground Connection Failure, other block switch detects that singlephase earth fault disappears after the block switch separating brake of the most close Single-phase Ground Connection Failure, time delay timing auto zero, and detect that the block switch that Single-phase Ground Connection Failure is positioned at mains side is failure to actuate.
8. single-phase grounded malfunction in grounded system of low current disposal route, described small current neutral grounding system is typical case's circuit hand in hand, comprise the first feeder line by transformer station outlet, by the second feeder line of another transformer station's outlet be connected to first, handle isolating switch between the second feeder terminal, it is characterized in that: first, on the second feeder line, all install some block switches, feeder line is divided into several power supply sections, it is other that each block switch all can be put residing side according to the arbitrary described single-phase earthing fault direction determination methods failure judgement of claim 1～6, the singlephase earth fault time-delay action of block switch is arranged to successively decrease successively along power flow, when there is singlephase earth fault on certain section of the first feeder line, detect that block switch that trouble spot is positioned at load side enters timing and prepares time delay separating brake, cause the block switch separating brake of close trouble spot, other is just at the block switch of timing after the block switch separating brake in the most close trouble spot, owing to detecting that singlephase earth fault disappears, stop time delay separating brake, timing auto zero, detect that the block switch that Single-phase Ground Connection Failure is positioned at mains side is failure to actuate, handle isolating switch detects one-sided decompression, after time delay, closes a floodgate, the first feeder line section after the second feeder line and Single-phase Ground Connection Failure reconstitutes handle feeder line new, still have singlephase earth fault at feeder line afterbody, and be also successively to successively decrease along power flow the actuation time of the time delay separating brake of the block switch on handle feeder line.When after handle breaker closing, all block switches on handle feeder line all detect that singlephase earth fault section is positioned at load side, cause the block switch separating brake of close trouble spot, other block switch stops time delay separating brake, timing auto zero owing to detecting that singlephase earth fault disappears after this block switch separating brake; The net result of fault handling is: make the both sides block switch separating brake of the most close singlephase earth fault section, by power section isolation of singlephase earth fault, other power supply area is normally worked.
9. single-phase grounded malfunction in grounded system of low current treating apparatus, it is characterized in that: comprise subsection setup some block switches on certain feeder line in small current neutral grounding system, described block switch is divided into some sections of power supply sections by feeder line, and described block switch is built-in with zero-sequence current detecting device, residual voltage sensor and intelligent controller.
10. single-phase grounded malfunction in grounded system of low current treating apparatus according to claim 9, it is characterized in that: the zero-sequence current detecting device of described block switch is zero sequence current mutual inductor or to be arranged on A, B, C each for the synthetic current transformer of zero-sequence current mutually, the residual voltage sensor of described block switch be three for the synthetic impedance type voltage sensor of residual voltage.
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