CN206258545U - Distribution terminal - Google Patents
Distribution terminal Download PDFInfo
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- CN206258545U CN206258545U CN201621282491.4U CN201621282491U CN206258545U CN 206258545 U CN206258545 U CN 206258545U CN 201621282491 U CN201621282491 U CN 201621282491U CN 206258545 U CN206258545 U CN 206258545U
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- sequence current
- residual voltage
- voltage
- distribution terminal
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- 230000003750 conditioning effect Effects 0.000 claims abstract description 15
- 238000002955 isolation Methods 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 238000013024 troubleshooting Methods 0.000 abstract description 5
- 238000011835 investigation Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 17
- 230000004807 localization Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The utility model is related to a kind of distribution terminal, including：Primary side car coat type zero sequence current mutual inductor, primary side electronic voltage transducer, fault ground base plate, secondary side zero sequence current mutual inductor, the isolation of secondary side electronic voltage transducer and conditioning module, analog-digital converter, controller core core；The fault ground base plate receives the residual voltage and zero-sequence current sampled signal of analog-digital converter, calculate the virtual value and the angle value between the residual voltage and the zero-sequence current of the residual voltage and the zero-sequence current, for whether within a preset range to judge the angle value between the residual voltage and the zero-sequence current, if so, being then defined as faulty section.The distribution terminal that the utility model is provided, realize carries out precise positioning to abort situation, reduces the workload of Utilities Electric Co.'s O＆M investigation, improves troubleshooting efficiency, shortens customer outage hours.
Description
Technical field
The utility model is related to distribution network technology field, more particularly to a kind of power distribution network small resistor singlephase earth fault positioning
Method and distribution terminal.
Background technology
This year, economical at any time develops rapidly, and each metropolitan 10KV power distribution networks mainly use buried cable so that right
Earth-current electric capacity is greatly increased.It is relatively costly if using traditional grounding through arc, needing larger compensation capacity.
And because 10KV distribution network lines operate the timely adjustment of tap of more, arc suppression coil to have any problem in operation, easily occur
Resonance overvoltage phenomenon.In order to solve the problem, the transformer station in general city employs Neutral Point Through Low Resistance side at present
Formula, while effectively prevent because of the phase fault accident that singlephase earth fault triggers.
Localization method for small resistor singlephase earth fault mainly uses zero sequence positioning mode, the zero sequence positioning mode at present
The feature and rule that system electrical amount is showed when mainly according to failure determine the position that failure occurs.But, with
The continuous transformation of power distribution network and the implementation of electrical power distribution automatization system, the feature detection of earth fault are no longer confined to circuit head end.
Transformer station's outlet (i.e. feeder line) has been segmented and has switched segmented, each switch installation place one line node of correspondence, outlet open circuit
Device and line sectionalizing switch are equiped with automatically-monitored equipment：Ca bin (FTU, DTU).However, it was found that using
Traditional zero sequence positioning mode in the small resistor single-phase earthing system of load heavy duty, the phenomenon of frequent outlet fault section erroneous judgement.
To find out its cause, because for low resistance grounding power distribution network, especially heavily loaded 10KV distribution lines, load is electric under normal circumstances
Stream can reach 150A, and be arranged on the distribution power automation terminal zero sequence excessively stream warning value at each on-load switch be generally only 60A or
120A, so, cause the erroneous judgement of the position of fault.Therefore, power distribution network small resistor singlephase earth fault how is accurately judged
Particular location, improves the efficiency for solving failure, is technical problem urgently to be resolved hurrily at present.
Utility model content
The utility model provides a kind of power distribution network small resistor method for locating single-phase ground fault and distribution terminal, is used to solve
Power distribution network small resistor singlephase earth fault positions inaccurate problem, improves troubleshooting efficiency, saves human cost.
In order to solve the above problems, the utility model provides a kind of power distribution network small resistor singlephase earth fault positioning side
Method, comprises the following steps：The residual voltage and zero-sequence current at collection distribution line two ends；By analog-digital converter to described
Residual voltage and zero-sequence current are sampled；Fourier transformation is carried out to sampled residual voltage and zero-sequence current；Calculate institute
State the virtual value and the angle value between the residual voltage and the zero-sequence current of residual voltage and the zero-sequence current；Judge
Angle value between the residual voltage and the zero-sequence current whether within a preset range, if so, being then defined as faulty section.
Preferably, the angle value between the residual voltage and the zero-sequence current is calculated using equation below：
Wherein, U0 represents residual voltage, and I0 represents zero-sequence current,Represent the angle between residual voltage and zero-sequence current
Degree.
Preferably, the zero-sequence current at the collection distribution line two ends and the specific steps of residual voltage include：Once
Switch cubicle side gathers the zero-sequence current at distribution line two ends by zero sequence current mutual inductor, and through the fault ground plate biography of secondary side
Transport to analog-digital converter；The zero sequence electricity at distribution line two ends is gathered by electronic voltage transducer a switch cubicle side
Pressure, and be transferred to after no-load voltage ratio on the FE earth plates of secondary side；Residual voltage on fault ground plate through voltage follower every
Amplify from rear entrance difference amplifier；Output is extremely simulated after residual voltage after to amplifying through difference amplifier carries out signal condition
Digital quantizer.
Preferably, the no-load voltage ratio is
Preferably, the preset range is 175 °~325 °.
The utility model additionally provides a kind of distribution terminal, including：Primary side car coat type zero sequence current mutual inductor：Directly pacify
Cable is spaced loaded on inlet wire, the fault ground plate of distribution terminal is received from zero-sequence current after its conversion, for by distribution high pressure
Circuit high current no-load voltage ratio is gathered into low current for distribution terminal；Primary side electronic voltage transducer：The failure of distribution terminal connects
Floor is received from residual voltage after its conversion, using the residual voltage at principle of capacitive divider collection distribution line two ends；Failure
Ground connection base plate：One piece of daughter board of distribution terminal, as controller core core, the isolation of secondary side electronic voltage transducer and conditioning
Module, secondary side zero sequence current mutual inductor, analog-digital converter complete the function that single-phase earthing judges thereon, together, and
By the backboard of distribution terminal rear end, it is transferred on communication daughter board and send backstage；Secondary side zero sequence current mutual inductor：Failure is welded in connect
On ground base plate, the zero-sequence current for isolating collection car coat type zero sequence current mutual inductor two ends again turns into simulation numeral
Parallel operation；Secondary side electronic voltage transducer is isolated and conditioning module：Plug-in unit on fault ground base plate, reception comes from and once sets
Residual voltage signal after the conversion of standby electronic voltage transducer, difference is entered after further carrying out voltage follower isolation
Amplifier amplify, and to amplifying through difference amplifier after residual voltage carry out signal condition after, into analog-digital converter；
Analog-digital converter：Collection is isolated and conditioning module turn from secondary side zero sequence current mutual inductor with electronic voltage transducer
Zero-sequence current and residual voltage after changing；Controller core core：Plug-in unit on fault ground base plate, receives analog-digital converter
Residual voltage and zero-sequence current sampled signal, and Fourier transformation is carried out to sampled zero-sequence current and residual voltage, and
Calculate the virtual value and the angle between the residual voltage and the zero-sequence current of the residual voltage and the zero-sequence current
Value, for whether within a preset range to judge the angle value between the residual voltage and the zero-sequence current, if, it is determined that
It is faulty section.
Preferably, the fault ground plate is calculated between the residual voltage and the zero-sequence current using equation below
Angle value：
Wherein, U0 represents residual voltage, and I0 represents zero-sequence current, represents the angle between residual voltage and zero-sequence current.
Preferably, the secondary side electronic voltage transducer isolation is come from switch cubicle once with conditioning module to receive
The electronic voltage transducer of equipment.
Preferably, the zero sequence current mutual inductor gathers distribution line a switch cubicle side by zero sequence current mutual inductor
The zero-sequence current at two ends, and through secondary side zero sequence current mutual inductor to analog-digital converter；The secondary side electronic type electricity
Pressure sensor is isolated with a conditioning module switch cubicle side of reception by electronic voltage transducer collection distribution line two ends
Residual voltage, through voltage follower isolate after into difference amplifier amplify, and to amplifying through difference amplifier after zero sequence electricity
Pressure is exported to analog-digital converter after carrying out signal condition.
Preferably, the no-load voltage ratio is 6.5：.
Preferably, the preset range is 175 °~325 °.
Power distribution network small resistor method for locating single-phase ground fault and distribution terminal that the utility model is provided, by surveying simultaneously
The zero-sequence current and residual voltage at distribution line two ends are determined, by the angle value between zero-sequence current and residual voltage to fault bit
Putting carries out precise positioning, greatly reduces the workload of Utilities Electric Co.'s O＆M investigation, improves troubleshooting efficiency, high degree
Shorten customer outage hours.
Brief description of the drawings
Accompanying drawing 1 is the power distribution network small resistor method for locating single-phase ground fault flow of the utility model specific embodiment
Figure；
Accompanying drawing 2 is the zero-sequence current and residual voltage at the collection distribution line two ends of the utility model specific embodiment
Specific steps flow chart；
Accompanying drawing 3 is the structural representation of the distribution terminal of the utility model specific embodiment；
Accompanying drawing 4 is the circuit diagram of the distribution terminal of the utility model specific embodiment.
Specific embodiment
The power distribution network small resistor method for locating single-phase ground fault and distribution terminal for providing the present invention below in conjunction with the accompanying drawings
Specific embodiment elaborate.
This specific embodiment provides a kind of one-phase earthing failure in electric distribution network localization method, and accompanying drawing 1 is of the invention specific
The power distribution network small resistor method for locating single-phase ground fault flow chart of implementation method.As shown in figure 1, power distribution network of the present invention
Method for locating single-phase ground fault comprises the following steps：
Step S11, the residual voltage and zero-sequence current at collection distribution line two ends.Compared to traditional power distribution network small resistor
The localization method of singlephase earth fault, the Fault Locating Method that this specific embodiment is proposed not only gathers distribution line two ends
Zero-sequence current, and collection has been also carried out to the residual voltage at distribution line two ends.By comprehensive analysis zero-sequence current and zero
Sequence voltage, realizes and fault section is accurately positioned.
Accompanying drawing 2 be the collection distribution line two ends of the specific embodiment of the invention zero-sequence current and residual voltage it is specific
Flow chart of steps, in order to accurately collection zero-sequence current and residual voltage, and is easy to subsequently locate the signal for gathering
Reason, it is preferred that the zero-sequence current at the collection distribution line two ends and the specific steps of residual voltage include：
Step S21, the zero-sequence current at distribution line two ends is gathered by zero sequence current mutual inductor a switch cubicle side, and
Transmitted to analog-digital converter (ADC) through the fault ground plate of secondary side and be acquired.Wherein, the zero sequence current mutual inductor
It is preferred that using precision higher, stable performance, responding rapid car coat type zero sequence current mutual inductor.
Step S22, the zero sequence at distribution line two ends is gathered by electronic voltage transducer (EVT) a switch cubicle side
It is transferred to after voltage, and no-load voltage ratio on the fault ground base plate (FE) of secondary side.Wherein, the electronic voltage transducer has body
The small, dynamic response of product is good, steady performance.In order to prevent infringement of the overtension to equipment, and ensure positioning higher
Precision, it is preferred that the no-load voltage ratio isIt is acquired.
Step S23, the residual voltage on fault ground plate is put after isolating through voltage follower into difference amplifier
Greatly；Residual voltage after to amplifying through difference amplifier is exported to analog-digital converter after carrying out signal condition.
Because, existing distribution network line is mainly 10KV circuits, if directly connecing 10KV high voltages in secondary side,
Distribution terminal equipment burnout can be then caused, consequence is hardly imaginable.To avoid this problem, this specific embodiment is for 10KV electricity high
The electronic voltage transducer that press-fitting electric line first passes through primary side will be gathered for secondary side again after 10KV voltage step-downs, and then two
Voltage that secondary side will just collect, current signal are calculated.
Step S12, is sampled by analog-digital converter to the residual voltage and zero-sequence current.
Step S13, Fourier transformation is carried out to sampled residual voltage and zero-sequence current.
Step S14, calculates the virtual value and the residual voltage and described zero of the residual voltage and the zero-sequence current
Angle value between sequence electric current.In order to improve the degree of accuracy of positioning, it is preferred that using equation below calculate the zero-sequence current with
Angle value between the residual voltage：
Wherein, U0 represents residual voltage, and I0 represents zero-sequence current,Represent the angle between residual voltage and zero-sequence current
Degree.
Whether within a preset range step S15, judge angle value between the residual voltage and the zero-sequence current, if
It is, it is determined that be faulty section.Preferably, the preset range is 175 °~325 °.Occur earth fault when, residual voltage with
The phase relation of zero-sequence current is only relevant with the zero sequence impedance angle of circuit.Wherein, the zero sequence impedance angle be zero-sequence current with
Angle value between residual voltage.When the angle value between the zero-sequence current and residual voltage for forward direction, and 175 °~
When in the range of 325 °, then to sent on backstage ground connection alert, consistency operation circuit breaker trip fault section, protection circuit is not by big
Short circuit current burns.If the angle value between the zero-sequence current and residual voltage within a preset range, does not illustrate the region
Generation earth fault, protection is failure to actuate.
The power distribution network small resistor method for locating single-phase ground fault that the present invention is provided, by determining distribution line two ends simultaneously
Zero-sequence current and residual voltage, abort situation is carried out by the angle value between zero-sequence current and residual voltage precisely fixed
Position, greatly reduces the workload of Utilities Electric Co. O＆M investigation, improve troubleshooting efficiency, and high degree shortens user
Power off time.
Moreover, this specific embodiment additionally provides a kind of distribution terminal, and accompanying drawing 3 is the specific embodiment of the invention
Distribution terminal structural representation, accompanying drawing 4 is the circuit diagram of the distribution terminal of the specific embodiment of the invention.Shown in accompanying drawing 3,
The distribution terminal of this specific embodiment is sensed including primary side car coat type zero sequence current mutual inductor 10, primary side electronic type voltage
Device 20, fault ground base plate 30, secondary side zero sequence current mutual inductor 31, the isolation of secondary side electronic voltage transducer and conditioning mould
Block 32, analog-digital converter 33, controller core core 34.
Wherein primary side car coat type zero sequence current mutual inductor 10, primary side electronic voltage transducer 20, secondary side zero sequence
Current transformer 31, the isolation of secondary side electronic voltage transducer and conditioning module 32 are all to carry out scaled down to signal to adopt
Collection.Because, existing distribution network line is mainly 10KV circuits, if directly connecing 10KV high voltages in secondary lateral terminal,
Distribution terminal equipment burnout can be then caused, consequence is hardly imaginable.To avoid this problem, this specific embodiment is for 10KV electricity high
The electronic voltage transducer (EVT) that press-fitting electric line first passes through primary side will be gathered for secondary side again after 10KV voltage step-downs,
Then just the voltage that will collect, current signal are calculated secondary side.
The primary side car coat type zero sequence current mutual inductor 10, the zero-sequence current for gathering distribution line two ends.Wherein,
The zero sequence current mutual inductor is preferably using precision is higher, stable performance, the car coat type zero sequence current mutual inductor that responds rapidly to；
The primary side electronic voltage transducer 20, the residual voltage for gathering distribution line two ends.Compared to biography
The localization method of the power distribution network small resistor singlephase earth fault of system, the Fault Locating Method that this specific embodiment is proposed, not only
The zero-sequence current at collection distribution line two ends, and residual voltage to distribution line two ends has been also carried out collection.By synthesis
Analysis zero-sequence current and residual voltage, realize and abort situation are accurately positioned.It is preferred that using small volume, dynamic response it is good,
The electronic voltage transducer of stable performance.
The secondary side zero sequence current mutual inductor 31：It is welded on fault ground base plate 30, for isolating collection institute again
The zero-sequence current at the two ends of primary side car coat type zero sequence current mutual inductor 10 is stated, and is transmitted to analog-digital converter 33；
The secondary side electronic voltage transducer isolation and conditioning module 32, the residual voltage from primary side is through voltage
Follow, isolate after into difference amplifier amplify, and to amplifying through difference amplifier after residual voltage carry out signal condition after
Export to analog-digital converter 33；
Analog-digital converter 33, for secondary side zero sequence current mutual inductor 31, secondary side electronic voltage transducer
The zero-sequence current and residual voltage that isolation is transmitted with conditioning module 32 carry out sampling processing.
Controller core core 34, connects analog-digital converter 33, the sampling for receiving residual voltage and zero-sequence current
Signal, and Fourier transformation is carried out to sampled zero-sequence current and residual voltage, and calculate the residual voltage and described zero
Angle value between the virtual value of sequence electric current and the residual voltage and the zero-sequence current.In order to improve operation efficiency, preferably
, the angle value between the residual voltage and the zero-sequence current is calculated using equation below：
Wherein, U0 represents residual voltage, and I0 represents zero-sequence current,Represent the angle between residual voltage and zero-sequence current
Degree.
Judge angle value between the residual voltage and the zero-sequence current whether in preset range according to result of calculation
It is interior, if so, being then defined as faulty section.Preferably, the preset range is 175 °~325 °.When there is earth fault, zero sequence
Voltage is only relevant with the zero sequence impedance angle of circuit with the phase relation of zero-sequence current.Wherein, the zero sequence impedance angle is zero sequence
Angle value between electric current and residual voltage.When the angle value between the zero-sequence current and residual voltage is forward direction, and
When in the range of 175 °~325 °, then to sent on backstage ground connection alert, consistency operation circuit breaker trip fault section, protection circuit is not
Burnt by big short circuit current.Detected simultaneously by positive direction and negative direction, it is ensured that zero-sequence current protection does not have dead band, operation letter
It is single reliable.If the angle value between the zero-sequence current and residual voltage within a preset range, does not illustrate that the region does not occur
Earth fault, protection is failure to actuate.
Power distribution network small resistor method for locating single-phase ground fault and distribution terminal that the present invention is provided, are matched somebody with somebody by determining simultaneously
The zero-sequence current and residual voltage at electric line two ends, are entered by the angle value between zero-sequence current and residual voltage to abort situation
Row precise positioning, greatly reduces the workload of Utilities Electric Co.'s O＆M investigation, improves troubleshooting efficiency, the contracting of high degree
Short customer outage hours.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, under the premise without departing from the principles of the invention, can also make some improvements and modifications, and these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (6)
1. a kind of distribution terminal, it is characterised in that including：
Primary side car coat type zero sequence current mutual inductor：Inlet wire interval cable is directly mounted at, the fault ground plate of distribution terminal connects
Receive from zero-sequence current after its conversion, for by distribution high-tension line high current no-load voltage ratio into low current, for distribution terminal collection；
Primary side electronic voltage transducer：The fault ground plate of distribution terminal is received from residual voltage after its conversion, is used
The residual voltage at principle of capacitive divider collection distribution line two ends；
Fault ground base plate：One piece of daughter board of distribution terminal, as controller core core, secondary side EVT isolation with conditioning module,
Secondary side zero sequence current mutual inductor, analog-digital converter complete the function that single-phase earthing judges thereon, together, and by matching somebody with somebody
The backboard of electric terminals rear end, is transferred on communication daughter board and send backstage；
Secondary side zero sequence current mutual inductor：It is welded on fault ground base plate, for isolating collection car coat type zero-sequence current again
The zero-sequence current at transformer two ends, into analog-digital converter；
Secondary side electronic voltage transducer is isolated and conditioning module：Plug-in unit on fault ground base plate, reception comes from and once sets
Residual voltage signal after the conversion of standby electronic voltage transducer, difference is entered after further carrying out voltage follower isolation
Amplifier amplify, and to amplifying through difference amplifier after residual voltage carry out signal condition after, into analog-digital converter；
Analog-digital converter：Collection is isolated and conditioning mould from secondary side zero sequence current mutual inductor with electronic voltage transducer
Zero-sequence current and residual voltage after block conversion；
Controller core core：Plug-in unit on fault ground base plate, receives the residual voltage and zero-sequence current of analog-digital converter
Sampled signal, and Fourier transformation is carried out to sampled zero-sequence current and residual voltage, and calculate the residual voltage and institute
The virtual value and the angle value between the residual voltage and the zero-sequence current of zero-sequence current are stated, for judging the zero sequence electricity
Pressure and the zero-sequence current between angle value whether within a preset range, if so, being then defined as faulty section.
2. distribution terminal according to claim 1, it is characterised in that the fault ground plate calculates institute using equation below
State the angle value between residual voltage and the zero-sequence current：
Wherein, U0Represent residual voltage, I0Represent zero-sequence current,Represent the angle between residual voltage and zero-sequence current.
3. distribution terminal according to claim 1, it is characterised in that the secondary side electronic voltage transducer isolation with
Conditioning module is to receive the electronic voltage transducer from primary equipment in switch cubicle.
4. distribution terminal according to claim 3, it is characterised in that the zero sequence current mutual inductor is a switch cubicle side
The zero-sequence current at distribution line two ends is gathered by zero sequence current mutual inductor, and through the zero sequence current mutual inductor extremely simulation of secondary side
Digital quantizer；The secondary side electronic voltage transducer isolation receives a switch cubicle side and passes through electronic type with conditioning module
The residual voltage at voltage sensor collection distribution line two ends, amplifies after isolating through voltage follower into difference amplifier, and
Residual voltage after to amplifying through difference amplifier is exported to analog-digital converter after carrying out signal condition.
5. distribution terminal according to claim 4, it is characterised in that the no-load voltage ratio is
6. distribution terminal according to claim 1, it is characterised in that the preset range is 175 °~325 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621282491.4U CN206258545U (en) | 2016-11-25 | 2016-11-25 | Distribution terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621282491.4U CN206258545U (en) | 2016-11-25 | 2016-11-25 | Distribution terminal |
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| Publication Number | Publication Date |
|---|---|
| CN206258545U true CN206258545U (en) | 2017-06-16 |
Family
ID=59026240
Family Applications (1)
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| CN201621282491.4U Active CN206258545U (en) | 2016-11-25 | 2016-11-25 | Distribution terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646120A (en) * | 2016-11-25 | 2017-05-10 | 国网江苏省电力公司扬州供电公司 | Distribution network small resistance single phase grounding fault positioning method and power distribution terminal |
-
2016
- 2016-11-25 CN CN201621282491.4U patent/CN206258545U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646120A (en) * | 2016-11-25 | 2017-05-10 | 国网江苏省电力公司扬州供电公司 | Distribution network small resistance single phase grounding fault positioning method and power distribution terminal |
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