CN103760465B - Single-phase grounded malfunction in grounded system of low current discriminating direction and processing method - Google Patents
Single-phase grounded malfunction in grounded system of low current discriminating direction and processing method Download PDFInfo
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Abstract
The present invention relates to a kind of single-phase grounded malfunction in grounded system of low current discriminating direction and processing method, fault direction method of discrimination is the zero-sequence current on the circuit backbone according to generation singlephase earth fault measured by block switch, angled relationships between residual voltage and zero-sequence current and residual voltage judges the single-phase fault point residing section on this backbone, according to this result of determination by fault section isolation, ensure the normal power supply of non-faulting section circuit to greatest extent, the enforcement of the present invention can the singlephase earth fault section of automatism isolation backbone, improve the power supply reliability of power distribution network, it addition, adopt the single-phase earthing directivity determination methods of the present invention, backbone boundary function is built in the block switch of 10kV feeder line, it is possible to the power failure range caused by singlephase earth fault reduces to greatest extent, thus improving power supply reliability and safety.
Description
Technical field
The present invention relates to a kind of single-phase grounded malfunction in grounded system of low current discriminating direction and processing method.
Background technology
China's 10kV distribution system adopts the method for operation (small current neutral grounding system) the i.e. isolated neutral of neutral point indirect earthing or the neutral by arc extinction coil grounding method of operation in the majority, 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.
After small current neutral grounding system there occurs singlephase earth fault, fault phase voltage-to-ground reduces, the rising of phase voltage over the ground that non-faulting is biphase, but line voltage is still symmetrical, thus not affecting the continuous power supply to user, system can run 1��2h, and this is also the great advantage of small current neutral grounding system; But, if electrical network long-play after there is singlephase earth fault, the safety and economic operation of converting equipment and power distribution network can be had a strong impact on. How quickly to determine the position of 10kV distribution circuit single-phase earth fault and to promptly isolate fault, to recover the power supply to user early, the safe operation of power distribution network is played 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 equipped with a set of Little Current Ground Connection System, only can inform it is which bar 10kV feeder line there occurs singlephase earth fault in transformer station, then rely on the mode manually operated a switch to be had a power failure by whole piece 10kV feeder line rather than only the fault zone on this feeder line has a power failure, in the hope of ensureing 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 judging that on backbone, the task of singlephase earth fault can only rely on the Small Electric Current Earthing And Routing Device of transformer station. After a certain bar feeder line there occurs singlephase earth fault, transformer station can only rely on the Little Current Ground Connection System installed in the inner and carry out the selection of singlephase earth fault circuit. Practical operation situation according to small current line selection equipment, route selection accuracy rate is substantially 40%��60%, that is the singlephase earth fault having nearly half is to rely on artificial drawing outlet switch one by one to carry out in the process of transformer station, so not only result in generation singlephase earth fault whole piece 10kV feeder line have a power failure rather than this feeder line in certain singlephase earth fault section have a power failure, the an innocent person of other non-faulting 10kV feeder lines many also can be caused simultaneously to have a power failure in short-term, bring unnecessary puzzlement to the normal electricity consumption of vast electricity consumption user. Even Little Current Ground Connection System route selection is correct, it is desirable to result be also the artificial instruction according to line-selected earthing device, artificial separating brake whole piece there occurs the 10kV feeder line of singlephase earth fault, and power failure area is big.
User demarcation switch or user demarcation chopper are all progressively being promoted the use of in domestic many areas, its object is to: user's branch line of 10kV feeder line occurs can be automatically separated from major network in time during singlephase earth fault, be i.e. during the load side generation singlephase earth fault of demarcation switch, do not affect the properly functioning of the major network branch line user with other. But in actual application process, user demarcation switch or user demarcation chopper often there will be tripping or tamper situation, it is impossible to fully realizes using original intention; It addition, user demarcation switch and demarcation circuit breaker cannot be shouldered automatic fault segments apart when there is singlephase earth fault on 10kV power distribution network backbone, recover the mission of non-faulting section normal power supply. Reason is that user demarcation switch or demarcation circuit breaker judge whether to occur that singlephase earth fault is only this unique criterion of size according to zero-sequence current value. Because singlephase earth fault type is more, having metallic earthing, arc grounding, high resistance ground etc., different singlephase earth fault type zero-sequence current values has very big-difference; And if very long also or also for the circuit of cable combination with the branch line installing demarcation switch or demarcation circuit breaker, then the capacitance current of branch line may to add the capacitance current of other branch lines suitable with backbone, now cannot ensure accuracy of judgement degree according only to the size of zero-sequence current value as the judgement in ground connection direction.
Summary of the invention
It is an object of the invention to for the deficiencies in the prior art, it is provided that a kind of single-phase grounded malfunction in grounded system of low current discriminating direction method, to overcome that 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.
The purpose of the present invention realizes by following technical solution:
Single-phase grounded malfunction in grounded system of low current discriminating direction method, it is characterised in that: comprise the steps:
Installing some block switches on a, certain feeder line in small current neutral grounding system, feeder line is divided into some sections of power supply sections, described block switch is built-in with zero-sequence current detector, residual voltage sensor and intelligent controller;
B, zero-sequence current detector detect zero-sequence current automatically, and the zero-sequence current data recorded is filtered, pass to intelligent controller after isolation processing;Residual voltage sensor detects residual voltage automatically, and the zero-sequence current data recorded passes to intelligent controller after blood pressure lowering, filtering and isolation processing; Zero-sequence current and residual voltage are carried out Vector operation and process by intelligent controller, obtain the advance angle of zero-sequence current, residual voltage, the advanced residual voltage of zero-sequence current, and according to zero-sequence current, residual voltage, the advanced residual voltage of zero-sequence current advance angle judge the section that singlephase earth fault occurs;
C, in isolated neutral system, when certain block switch detect zero-sequence current more than set threshold value, residual voltage more than set threshold value time, if the advance angle of the advanced residual voltage of zero-sequence current is 180��270 ��, then judge that the load side at this block switch occurs earth fault; When the advance angle of the advanced residual voltage of zero-sequence current is 0��90 ��, then judge that the mains side at this block switch occurs earth fault;
In arc suppression coil earthing system, when certain block switch detect zero-sequence current more than set threshold value, residual voltage more than set threshold value time, if the advance angle of the advanced residual voltage of zero-sequence current is 90��270 ��, then judge that the load side at this block switch occurs earth fault; When the advance angle of the advanced residual voltage of zero-sequence current is 0��90 ��, then judge that the mains side at this block switch occurs earth fault.
Further, described block switch is the segmentation on-load switch with backbone boundary function or section switch.
Further, the zero-sequence current detector of described block switch is zero sequence current mutual inductor or is arranged on each current transformer for zero-sequence current synthesis of A, B, C phase.
Further, the residual voltage sensor of described block switch is the three impedance type voltage sensors being served only for residual voltage synthesis.
Further, if arc suppression coil earthing system is in overcompensation state, when certain block switch detect zero-sequence current more than the threshold value set, residual voltage more than the advance angle of the advanced residual voltage of the threshold value set and zero-sequence current as 90��180 �� time, then judge the earth fault generation load side at this block switch.
Further, if arc suppression coil earthing system is in undercompensation state, when certain block switch detect zero-sequence current more than the threshold value set, residual voltage more than the advance angle of the advanced residual voltage of the threshold value set and zero-sequence current as 180��270 �� time, then judge the earth fault generation load side at 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 processing method is provided, to overcome, the troubleshooting that prior art exists needs manual operation, troubleshooting specific aim is poor, often result in the problems such as large-area power-cuts situation, and concrete scheme is as follows:
Single-phase grounded malfunction in grounded system of low current processing method, it is characterized in that: some block switches installed by certain feeder line including in small current neutral grounding system, feeder line is divided into some sections of power supply sections, each block switch all can side residing for the arbitrary described single-phase earthing fault direction determination methods failure judgement point of claim 1��6 other, time-delay action when being occurred by block switch load side singlephase earth fault is arranged to the form successively decreased successively along power flow, when singlephase earth fault occurs, detect that trouble point point is positioned at the block switch preparation time delay separating brake of load side, cause that block switch separating brake near Single-phase Ground Connection Failure, other block switch is detecting that singlephase earth fault disappears after the block switch separating brake of Single-phase Ground Connection Failure, time delay timing auto zero, and detect that Single-phase Ground Connection Failure is positioned at the block switch of mains side and is failure to actuate.
Single-phase grounded malfunction in grounded system of low current processing method, described small current neutral grounding system is typical case's circuit hand in hand, including the first feeder line by transformer station outlet, by the second feeder line of another transformer station's outlet and be connected to first, handle chopper between second feeder terminal, it is characterized in that: first, second feeder line is all installed some block switches, feeder line to be divided into several power supply sections, each block switch all can side residing for the arbitrary described single-phase earthing fault direction determination methods failure judgement point of claim 1��6 other, it is arranged to successively decrease successively along power flow by the singlephase earth fault time-delay action of block switch, when certain section of the first feeder line occurs singlephase earth fault, detect that trouble point is positioned at the block switch of load side and is clocked into preparing time delay separating brake, cause the block switch separating brake near trouble point, other just at the block switch of timing after the block switch separating brake of trouble point, time delay separating brake is stopped owing to detecting singlephase earth fault to disappear, timing auto zero,Detect that Single-phase Ground Connection Failure is positioned at the block switch of mains side and is failure to actuate; Handle chopper detects unilateral decompression, closes a floodgate after time delay, the first feeder line section after second feeder line and Single-phase Ground Connection Failure reconstructs handle feeder line new, still suffer from singlephase earth fault at feeder line afterbody, and the movement time of the time delay separating brake of the block switch on handle feeder line is also successively decrease successively along power flow. 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 near trouble point, other block switch stops time delay separating brake owing to detecting singlephase earth fault to disappear after this block switch separating brake, timing auto zero; The final result of troubleshooting is: make the both sides block switch separating brake near singlephase earth fault section, and section of being powered by singlephase earth fault is isolated, other power supply area normal operation.
Single-phase grounded malfunction in grounded system of low current processes device, it is characterized in that: the some block switches including being divided in small current neutral grounding system on certain feeder line, feeder line is divided into some sections of power supply sections by described block switch, described block switch is built-in with zero-sequence current detector, residual voltage sensor and intelligent controller, the zero-sequence current detector of described block switch is zero sequence current mutual inductor or is arranged on A, B, C phase is each mutually for the current transformer of zero-sequence current synthesis, the residual voltage sensor of described block switch is the three impedance type voltage sensors being served only for residual voltage synthesis.
There is advantages that
The present invention provides single-phase earthing fault direction method of discrimination, adopt the intelligent block switch of backbone, block switch can according to zero-sequence current value, whether residual voltage value exceedes the angle set between thresholding and residual voltage and zero-sequence current, differentiate that Single-phase Ground Connection Failure is to occur at mains side or the load side of this demarcation switch accurately, so that block switch not only limits the separation place being applied to user, also can expand range of application to the backbone of 10kV, singlephase earth fault section by the block switch automatism isolation backbone with backbone singlephase earth fault boundary function, maximum magnitude ground ensures the normal power supply of non-faulting section, improve the power supply reliability of power distribution network.
Additionally, the present invention provides singlephase earth fault processing method, adopt the intelligent block switch of backbone, the section position residing for Single-phase Ground Connection Failure can be found in time and automatically be separated processing to it, troubleshooting efficiency effectively improves, significantly reduce singlephase earth fault and brought the probability expanding the generation of power failure area event, the power failure range caused by singlephase earth fault reduces to greatest extent, thus improving power supply reliability and safety, it is possible to safeguard the Electrical Safety of vast power consumer better.
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 in 10kV arc suppression coil earthing system on certain feeder line.
Voltage vector-diagram when Fig. 2 is that in 10kV small current neutral grounding system, certain feeder line is properly functioning.
Fig. 3 be disregard that line-to-ground presents resistive time arc suppression coil earthing system in zero-sequence current and residual voltage vectogram when singlephase earth fault occurs the load side A phase of certain demarcation switch on certain feeder line.
Fig. 4 be on certain feeder line that (counts line-to-ground impedance) in real system certain demarcation switch load side A phase vectogram of zero-sequence current and residual voltage when there is singlephase earth fault.
Residual voltage when Fig. 5 is the load side generation singlephase earth fault of certain demarcation switch on arc suppression coil earthing system feeder line and system is in overcompensation and zero-sequence current vectogram.
Fig. 6 is the load side generation singlephase earth fault of certain demarcation switch on arc suppression coil earthing system feeder line and system is in the vectogram of residual voltage and zero-sequence current during undercompensation.
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 the mains side A phase of certain demarcation switch on certain feeder line in arc suppression coil earthing system zero-sequence current and residual voltage vectogram when there is singlephase earth fault.
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 be isolated neutral system disregards line-to-ground presents resistive time a feeder line on the load side A phase of certain demarcation switch zero-sequence current and residual voltage vectogram when there is singlephase earth fault.
Figure 12 be on certain feeder line that (counts line-to-ground impedance) in isolated neutral system certain demarcation switch load side A phase vectogram of zero-sequence current and residual voltage when there is singlephase earth fault.
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 the mains side A phase of certain demarcation switch on certain feeder line in isolated neutral system zero-sequence current and residual voltage vectogram when there is singlephase earth fault.
Detailed description of the invention
Single-phase grounded malfunction in grounded system of low current discriminating direction method, comprises the steps:
A, certain feeder line in small current neutral grounding system backbone on install some block switches, feeder line to be divided into some sections of power supply areas, block switch is on-load switch or the chopper with backbone singlephase earth fault boundary function, zero-sequence current detector, residual voltage sensor and intelligent controller it is provided with in it, zero-sequence current detector is zero sequence current mutual inductor ZCT or is arranged on each current transformer for zero-sequence current synthesis of A, B, C phase, and A, B, C phase current mutual inductor is for the synthesis of zero-sequence current; Residual voltage sensor is the synthesis for residual voltage of three impedance type voltage sensors;
B, zero-sequence current detector detect zero-sequence current automatically, and the zero-sequence current data recorded is filtered, pass to intelligent controller after isolation processing; Residual voltage sensor detects residual voltage automatically, and the zero-sequence current data recorded passes to intelligent controller after blood pressure lowering, filtering and isolation processing; Zero-sequence current and residual voltage are carried out Vector operation and process by intelligent controller, obtain the advance angle of zero-sequence current, residual voltage, the advanced residual voltage of zero-sequence current, and according to zero-sequence current, residual voltage, the advanced residual voltage of zero-sequence current advance angle judge earth fault spot;
C, in isolated neutral system, when certain block switch detect zero-sequence current more than set threshold value, residual voltage more than set threshold value time, if the advance angle of the advanced residual voltage of zero-sequence current is 180��270 ��, then judge that the load side at this block switch occurs earth fault;When the advance angle of the advanced residual voltage of zero-sequence current is 0��90 ��, then judge that the mains side at this block switch occurs earth fault;
In arc suppression coil earthing system, when certain block switch detect zero-sequence current more than set threshold value, residual voltage more than set threshold value time, if the advance angle of the advanced residual voltage of zero-sequence current is 90��270 ��, then judge that the load side at this block switch occurs earth fault; When the advance angle of the advanced residual voltage of zero-sequence current is 0��90 ��, then judge that the mains side at this block switch occurs earth fault.
Single-phase grounded malfunction in grounded system of low current processing method, some block switches are installed including on certain feeder line backbone in small current neutral grounding system, feeder line to be divided into some sections of power supply areas, every block switch all can determine whether that the side of singlephase earth fault is other, block switch load side singlephase earth fault time-delay action is arranged to the form successively decreased successively along power flow, when singlephase earth fault occurs, detect that trouble point is positioned at the block switch trigger separating brake timing of load side, cause the block switch separating brake (timing time is the shortest) near trouble point, other block switch is stopping time delay separating brake timing auto zero owing to detecting singlephase earth fault to disappear after the block switch separating brake of trouble point, detect that trouble point is positioned at the block switch of mains side and is failure to actuate.
Between zero-sequence current, residual voltage, the Vector operation of angle is as described below:
(1), the load side generation singlephase earth fault of certain block switch on certain feeder line backbone in compensated distribution network, as shown in Figure 1:
1, in theory load side generation singlephase earth fault time, with reference to Fig. 2,
With reference to Fig. 1, Fig. 3, the zero-sequence current value I now detected from zero sequence current mutual inductor ZCT0For:
2, in actual compensated distribution network during the load side generation singlephase earth fault of certain block switch on certain feeder line backbone
With continued reference to Fig. 1, when singlephase earth fault occurs A phase, with reference to Fig. 4, residual voltage and zero-sequence current are such as shown in following calculating, and on real system circuit except pure inductance composition and direct-to-ground capacitance composition, resistance resistance composition also exists simultaneously. When therefore considering resistance factors, the angle of the advanced Va of capacitance current is more than 90 ��, and the angle of the delayed Va of inductive current is also greater than 90 ��.
The vector correlation of residual voltage and zero-sequence current when arc suppression coil earthing system overcompensation and undercompensation, 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 overcompensation state, then the advance angle of the advanced residual voltage of zero-sequence current in zero sequence current mutual inductor ZCT is 90 �㡫180 �� scopes; And the advance angle of the advanced residual voltage of zero-sequence current that system is in during undercompensation in ZCT is 180 �㡫270 �� scopes.
Additionally, 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 advance angle of the advanced residual voltage of zero-sequence current and the undercompensation state of arc suppression coil earthing system are essentially identical, refer to Figure 10,11,12.
(2), the mains side generation earth fault of certain block switch on certain feeder line backbone in earth-free or compensated distribution network, as shown in figs. 7 and 13:
With reference to Fig. 7 and Figure 13, when mains side generation earth fault, capacitance current I01Cannot be detected by ZCT with inductive current IL, with reference to Fig. 8 and Figure 14, zero-sequence current value I0For:
By above-mentioned calculating it can be seen that when the mains side generation singlephase earth fault of certain block switch of certain feeder line in extinguishing arc circuit earthed system, the advance angle of the advanced residual voltage of zero-sequence current in zero sequence current mutual inductor is 0 �㡫90 �� scopes.
Below in conjunction with embodiment, the working method of the present invention is elaborated:
It is made up of the Article 10 10kV feeder line of the Article 2 10kV feeder line of the 10kVI section bus of No. 1 transformer station and the 10kVII section bus of No. 2 transformer stations with reference to the typical 10kV of this in Fig. 9 circuit of handing in hand, at the end of two feeder lines with a chopper as handle chopper, form 10kV common at present and hand in hand feeder line. Wherein DL1, DL2, DL3 are the chopper 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 is referred to as block switch.
Time normal, the 10kVI section bus of No. 1 transformer station is responsible for Article 2 10kV outlet from No. 1 substation exit until the power supply in handle chopper 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 10kVII section bus of No. 2 transformer stations is responsible for Article 10 10kV outlet from No. 2 substation exit until the power supply in handle chopper 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, it is allowed to operate with failure 1��2 hour. Each block switch DL1, F1, F2, F3, F4, DL3, F8, F7, F6, F5, DL2 on above-mentioned circuit, all can accurately judging that singlephase earth fault is to occur at mains side or the load side of this TV station block switch, the block switch time delay opening time when load side generation singlephase earth fault is set as follows table:
When assuming that normal power supply process, between F2 and F3 block switch, singlephase earth fault occurs, DL1, F1, F2 detect that load side there occurs singlephase earth fault, the movement time of the time delay separating brake of block switch successively decreases successively along power flow, operation time limit according to upper table is arranged, F2 automatic brake separating when timing was by 27 seconds after its load side generation singlephase earth fault, after F2 separating brake, F1 and DL1 is owing to detecting that singlephase earth fault disappears and stops timing and timing auto zero timing time is not timed out; And F3, F4 detect that mains side generation singlephase earth fault is both not-time and be also failure to actuate, now it is made up of the feeder line that trend is flowed to the upper extreme point of F2 by No. 1 transformer station's outlet switch DL1, F1, F2.
DL3 is after F2 separating brake, at the unilateral decompression time-delay closing timing time of handle switch set in advance to rear combined floodgate, now by DL2, F5, F6, F7, F8, DL3, F3, F2 constitutes the new feeder line that trend is flowed to the lower extreme point of F2 by No. 2 transformer station's outlet switchs, while DL3 closes a floodgate, F3, F4, DL3, DL2, F5, F6, F7, F8 block switch detects that load side there occurs singlephase earth fault, time delay opening time during due to block switch load side generation singlephase earth fault successively decreases successively along power flow, operation time limit according to upper table is arranged, F3 is separating brake after 12 seconds, F4, DL3, DL2, F5, F6, F7, F8 stops timing being failure to actuate and timing auto zero owing to detecting singlephase earth fault to disappear.
The other detection case table in singlephase earth fault side of this handle circuit during F2, F3 section generation singlephase earth fault:
So far, section F2 to the F3 section of singlephase earth fault is had automatically to have a power failure, other whole normal power supplies in non-faulting region.
What can above scheme realize it is critical only that, and whether block switch accurately judges that singlephase earth fault occurs in its mains side or load side, i.e. the calculating of the relation of the angle that key point is in that between residual voltage and zero-sequence current and the accuracy determined.
The above, be only presently preferred embodiments of the present invention, therefore can not limit scope of the invention process with this, and the equivalence namely made 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 (7)
1. single-phase grounded malfunction in grounded system of low current discriminating direction method, it is characterised in that: comprise the steps:
Installing some block switches on a, certain feeder line in small current neutral grounding system, feeder line is divided into some sections of power supply sections, described block switch is built-in with zero-sequence current detector, residual voltage sensor and intelligent controller;
B, zero-sequence current detector detect zero-sequence current automatically, and the zero-sequence current data recorded is filtered, pass to intelligent controller after isolation processing; Residual voltage sensor detects residual voltage automatically, and the residual voltage data recorded pass to intelligent controller after blood pressure lowering, filtering and isolation processing; Zero-sequence current and residual voltage are carried out Vector operation and process by intelligent controller, obtain the advance angle of zero-sequence current, residual voltage, the advanced residual voltage of zero-sequence current, and according to zero-sequence current, residual voltage, the advanced residual voltage of zero-sequence current advance angle judge the section that singlephase earth fault occurs;
C, in isolated neutral system, when certain block switch detect zero-sequence current more than set threshold value, residual voltage more than set threshold value time, if the advance angle of the advanced residual voltage of zero-sequence current is 180��270 ��, then judge that the load side at this block switch occurs earth fault; When the advance angle of the advanced residual voltage of zero-sequence current is 0��90 ��, then judge that the mains side at this block switch occurs earth fault;
In arc suppression coil earthing system, when certain block switch detect zero-sequence current more than set threshold value, residual voltage more than set threshold value time, if the advance angle of the advanced residual voltage of zero-sequence current is 90��270 ��, then judge that the load side at this block switch occurs earth fault; When the advance angle of the advanced residual voltage of zero-sequence current is 0��90 ��, then judge that the mains side at this block switch occurs earth fault;
If arc suppression coil earthing system is in overcompensation state, when certain block switch detect zero-sequence current more than the threshold value set, residual voltage more than the advance angle of the advanced residual voltage of the threshold value set and zero-sequence current as 90��180 �� time, then judge the earth fault generation load side at this block switch.
2. single-phase grounded malfunction in grounded system of low current discriminating direction method according to claim 1, it is characterised in that: described block switch is the segmentation on-load switch with backbone boundary function or section switch.
3. single-phase grounded malfunction in grounded system of low current discriminating direction method according to claim 1, it is characterised in that: the zero-sequence current detector of described block switch is zero sequence current mutual inductor or is arranged on each current transformer for zero-sequence current synthesis of A, B, C phase.
4. single-phase grounded malfunction in grounded system of low current discriminating direction method according to claim 1, it is characterised in that: the residual voltage sensor of described block switch is the three impedance type voltage sensors being served only for residual voltage synthesis.
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 undercompensation state, when certain block switch detect zero-sequence current more than the threshold value set, residual voltage more than the advance angle of the advanced residual voltage of the threshold value set and zero-sequence current as 180��270 �� time, then judge the earth fault generation load side at this block switch.
6. single-phase grounded malfunction in grounded system of low current processing method, it is characterized in that: some block switches installed by certain feeder line including in small current neutral grounding system, feeder line is divided into some sections of power supply sections, each block switch all can side residing for the arbitrary described single-phase earthing fault direction determination methods failure judgement point of Claims 1 to 5 other, time-delay action when being occurred by block switch load side singlephase earth fault is arranged to the form successively decreased successively along power flow, when singlephase earth fault occurs, detect that trouble point point is positioned at the block switch preparation time delay separating brake of load side, cause that block switch separating brake near Single-phase Ground Connection Failure, other block switch is detecting that singlephase earth fault disappears after the block switch separating brake of Single-phase Ground Connection Failure, time delay timing auto zero, and detect that Single-phase Ground Connection Failure is positioned at the block switch of mains side and is failure to actuate.
7. single-phase grounded malfunction in grounded system of low current processing method, described small current neutral grounding system is typical case's circuit hand in hand, including the first feeder line by transformer station outlet, by the second feeder line of another transformer station's outlet and be connected to first, handle chopper between second feeder terminal, it is characterized in that: first, second feeder line is all installed some block switches, feeder line to be divided into several power supply sections, each block switch all can side residing for the arbitrary described single-phase earthing fault direction determination methods failure judgement point of Claims 1 to 5 other, it is arranged to successively decrease successively along power flow by the singlephase earth fault time-delay action of block switch, when certain section of the first feeder line occurs singlephase earth fault, detect that trouble point is positioned at the block switch of load side and is clocked into preparing time delay separating brake, cause the block switch separating brake near trouble point, other just at the block switch of timing after the block switch separating brake of trouble point, time delay separating brake is stopped owing to detecting singlephase earth fault to disappear, timing auto zero, detect that Single-phase Ground Connection Failure is positioned at the block switch of mains side and is failure to actuate, handle chopper detects unilateral decompression, closes a floodgate after time delay, the first feeder line section after second feeder line and Single-phase Ground Connection Failure reconstructs handle feeder line new, still suffer from singlephase earth fault at feeder line afterbody, and the movement time of the time delay separating brake of the block switch on handle feeder line is also successively decrease successively along power flow. 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 near trouble point, other block switch stops time delay separating brake owing to detecting singlephase earth fault to disappear after this block switch separating brake, timing auto zero, the final result of troubleshooting is: make the both sides block switch separating brake near singlephase earth fault section, and section of being powered by singlephase earth fault is isolated, other power supply area normal operation.
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| CN201410035323.4A CN103760465B (en) | 2014-01-24 | 2014-01-24 | Single-phase grounded malfunction in grounded system of low current discriminating direction and processing method |
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