CN106646120A - Distribution network small resistance single phase grounding fault positioning method and power distribution terminal - Google Patents
Distribution network small resistance single phase grounding fault positioning method and power distribution terminal Download PDFInfo
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- CN106646120A CN106646120A CN201611066976.4A CN201611066976A CN106646120A CN 106646120 A CN106646120 A CN 106646120A CN 201611066976 A CN201611066976 A CN 201611066976A CN 106646120 A CN106646120 A CN 106646120A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000009466 transformation Effects 0.000 claims abstract description 8
- 238000002955 isolation Methods 0.000 claims description 14
- 230000003750 conditioning effect Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 claims 1
- 238000011835 investigation Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract 1
- 230000004807 localization Effects 0.000 description 4
- 238000013024 troubleshooting Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Locating Faults (AREA)
Abstract
The invention relates to a distribution network small resistance single phase grounding fault positioning method and a power distribution terminal. The distribution network small resistance single phase grounding fault positioning method comprises the following steps: zero sequence voltage and zero sequence current at two ends of a distribution line are acquired; the zero sequence voltage and the zero sequence current are sampled, and then, Fourier transformation is carried out; effective values of the zero sequence voltage and the zero sequence current and the angle value between the zero sequence voltage and the zero sequence current are calculated; and whether the angle value is in a preset range is judged, and if yes, a fault area is determined. According to the distribution network small resistance single phase grounding fault positioning method and the power distribution terminal provided by the invention, a fault position can be accurately positioned, the workload for operation and maintenance investigation by a power company can be greatly reduced, the fault processing efficiency is improved, and the power failure time of the user is shortened to a great degree.
Description
Technical field
The present invention relates to distribution network technology field, more particularly to a kind of power distribution network small resistor method for locating single-phase ground fault
And distribution terminal.
Background technology
This year, economical at any time develops rapidly, and each metropolitan 10KV power distribution networks mainly adopt 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 in operation the timely adjustment of tap of more, arc suppression coil to have any problem, easily occur
Resonance overvoltage phenomenon.In order to solve the problem, at present the transformer station in general city employs Neutral Point Through Low Resistance side
Formula, while effectively prevent the phase fault accident caused because of singlephase earth fault.
For the localization method of small resistor singlephase earth fault mainly adopts at present zero sequence positioning mode, the zero sequence positioning mode
The feature and rule for mainly being presented according to system electrical amount during failure determines the position that failure occurs.But, with
The continuous transformation of power distribution network and the enforcement of electrical power distribution automatization system, the feature detection of earth fault is no longer confined to circuit head end.
Transformer station's outlet (i.e. feeder line) is segmented and switchs 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 adopting
Traditional zero sequence positioning mode in the small resistor single-phase earthing system of load heavy duty, the phenomenon of Jing normal outlet fault sections erroneous judgement.
Trace it to its cause, be because that under normal circumstances load is electric for low resistance grounding power distribution network, especially heavily loaded 10KV distribution lines
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.
The content of the invention
The present invention provides a kind of power distribution network small resistor method for locating single-phase ground fault and distribution terminal, to solve distribution
Net small resistor singlephase earth fault positions inaccurate problem, improves troubleshooting efficiency, saves human cost.
In order to solve the above problems, the invention provides a kind of power distribution network small resistor method for locating single-phase ground fault, bag
Include following steps：The residual voltage and zero-sequence current at collection distribution line two ends；By analog-digital converter to the zero sequence
Voltage and zero-sequence current are sampled；Fourier transformation is carried out to sampled residual voltage and zero-sequence current；Calculate described zero
The virtual value and the angle value between the residual voltage and the zero-sequence current of sequence voltage and the zero-sequence current；Judge described
Angle value between residual voltage and the zero-sequence current is then defined as faulty section whether in preset range, if so,.
Preferably, the angle value between the residual voltage and the zero-sequence current is calculated using equation below：
Wherein, U0 represents zero-sequence current, and I0 represents residual voltage,Represent the angle between residual voltage and zero-sequence current
Degree.
Preferably, the zero-sequence current at collection distribution line two ends and the concrete 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 the fault ground plate of Jing secondary sides is passed
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 fault ground plate of secondary side；Residual voltage Jing voltage followers on fault ground plate
Amplify into difference amplifier after isolation；Residual voltage Jing after difference amplifier amplifies is carried out being exported to mould after signal condition
Intend digital quantizer.
Preferably, the no-load voltage ratio is
Preferably, the preset range is 175 °～325 °.
Present invention also offers a kind of distribution terminal, including：
Primary side car coat type zero sequence current mutual inductor：It is directly mounted at inlet wire interval cable, the fault ground of distribution terminal
Plate receives the zero-sequence current after its conversion, into small current, adopts for distribution terminal for by distribution high-tension line high current no-load voltage ratio
Collection；
Primary side electronic voltage transducer：The fault ground plate of distribution terminal receives the residual voltage after its conversion,
The residual voltage at distribution line two ends is gathered using principle of capacitive divider；
Fault ground base plate：One piece of daughter board of distribution terminal.As controller core core, secondary side EVT isolation and conditioning
Module, secondary side zero sequence current mutual inductor, analog-digital converter converter complete thereon, together the work(of single-phase earthing judgement
Energy.And by the backboard of distribution terminal rear end, be transferred on communication daughter board and give backstage；
Secondary side zero sequence current mutual inductor：It is welded on fault ground base plate, for isolating collection car coat type zero sequence again
The zero-sequence current at current transformer two ends, into analog-digital converter converter；
Secondary side electronic voltage transducer is isolated and conditioning module：Plug-in unit on fault ground base plate, receives from one
Residual voltage signal after the conversion of the electronic voltage transducer of secondary device, further carries out being entered after voltage follower isolation
Difference amplifier amplifies, and the residual voltage Jing after difference amplifier amplifies is carried out after signal condition, turns into simulation numeral
Parallel operation；
Analog-digital converter：Collection is isolated with electronic voltage transducer and is adjusted from secondary side zero sequence current mutual inductor
Zero-sequence current and residual voltage after reason module conversion；
Controller core core：Plug-in unit on fault ground base plate, receives the residual voltage and zero sequence of analog-digital converter
Current sampling signal, and Fourier transformation is carried out to sampled zero-sequence current and residual voltage, and calculate the residual voltage
With the virtual value and the angle value between the residual voltage and the zero-sequence current of the zero-sequence current, for judging described zero
Angle value between sequence voltage and the zero-sequence current is then defined as faulty section whether in preset range, if so,.
Preferably, the controller core board package on the fault ground plate is processed data, described using as follows
Formula calculates the angle value between the residual voltage and the zero-sequence current：
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 mutual inductor gathers distribution line a switch cubicle side by zero sequence current mutual inductor
The zero-sequence current at two ends, and the fault ground plate of Jing secondary sides transmitted to analog-digital converter；The secondary side electronic type electricity
Pressure sensor isolates the zero sequence with switch cubicle side of conditioning module reception electronic voltage transducer collection distribution line two ends
Voltage, amplifies Jing after voltage follower isolation into difference amplifier, and the residual voltage Jing after difference amplifier amplifies is entered
Export to analog-digital converter after row signal condition.
Preferably, the no-load voltage ratio is
Preferably, the preset range is 175 °～325 °.
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, is 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.
Description of the drawings
Accompanying drawing 1 is the power distribution network small resistor method for locating single-phase ground fault flow chart of the specific embodiment of the invention；
Accompanying drawing 2 is the concrete of the zero-sequence current at the collection distribution line two ends of the specific embodiment of the invention and residual voltage
Flow chart of steps；
Accompanying drawing 3 is the structural representation of the distribution terminal of the specific embodiment of the invention；
Accompanying drawing 4 is the circuit diagram of the distribution terminal of the specific embodiment of the invention.
Specific embodiment
The present invention is provided power distribution network small resistor method for locating single-phase ground fault below in conjunction with the accompanying drawings and distribution terminal
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 concrete
The power distribution network small resistor method for locating single-phase ground fault flow chart of embodiment.As shown in figure 1, power distribution network of the present invention
Method for locating single-phase ground fault comprises the steps：
Step S11, gathers the residual voltage and zero-sequence current at 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 is the concrete of the zero-sequence current at the collection distribution line two ends of the specific embodiment of the invention and residual voltage
Flow chart of steps, in order to accurately collection zero-sequence current and residual voltage, and is easy to the signal to gathering subsequently to be located
Reason, it is preferred that the zero-sequence current at collection distribution line two ends and the concrete steps of residual voltage include：
Step S21, a switch cubicle side zero-sequence current at distribution line two ends is gathered by zero sequence current mutual inductor, and
The fault ground plate of Jing secondary sides is transmitted to analog-digital converter (ADC) and is acquired.Wherein, the zero sequence current mutual inductor
It is preferred that adopting higher precision, stable performance, responding rapid car coat type zero sequence current mutual inductor.
Step S22, a switch cubicle side zero sequence at distribution line two ends is gathered by electronic voltage transducer (EVT)
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 little, dynamic response of product is good, steady performance.In order to prevent infringement of the overtension to equipment, and guarantee higher positioning
Precision, it is preferred that the no-load voltage ratio isIt is acquired.
Step S23, the residual voltage on fault ground plate is put Jing after voltage follower isolation into difference amplifier
Greatly；Residual voltage Jing after difference amplifier amplifies is carried out being exported to analog-digital converter after signal condition.
This is 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 the high electricity of 10KV
Press-fitting electric line first passes through the electronic voltage transducer of primary side and will gather for secondary side again after 10KV voltage step-downs, and then two
Secondary side is just calculated the voltage for collecting, current signal.
Step S12, is sampled by analog-digital converter to the residual voltage and zero-sequence current.
Step S13, to sampled residual voltage and zero-sequence current Fourier transformation is carried out.
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.
Step S15, judges the angle value between the residual voltage and the zero-sequence current whether in preset range, if
It is, it is determined that for 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 alarm is grounded to sending on backstage, 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 is not in preset range, the region is illustrated
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.This is 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 the high electricity of 10KV
Press-fitting electric line first passes through the electronic voltage transducer (EVT) of primary side and will gather for secondary side again after 10KV voltage step-downs,
Then secondary side is just calculated the voltage for collecting, current signal.
The primary side car coat type zero sequence current mutual inductor 10, for gathering the zero-sequence current at 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, for gathering the residual voltage at 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 the 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, from the residual voltage Jing voltages of primary side
Follow, isolate after into difference amplifier amplify, and to Jing difference amplifier amplify after residual voltage carry out after signal condition
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 carries out sampling processing.
Controller core core 34, connects analog-digital converter 33, for receiving the sampling of 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.
The result of calculation is used to judge whether the angle value between the residual voltage and the zero-sequence current is being preset
In the range of, if so, then it is defined as faulty section.Preferably, the preset range is 175 °～325 °.When there is earth fault,
Residual 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
Angle value between zero-sequence 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 alarm, consistency operation circuit breaker trip fault section, protection circuit are grounded to sending on backstage
Do 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
It is simple and reliable.If the angle value between the zero-sequence current and residual voltage is not in preset range, illustrate that the region is not sent out
Raw 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, is 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 (10)
1. a kind of power distribution network small resistor method for locating single-phase ground fault, it is characterised in that comprise the steps：
The residual voltage and zero-sequence current at collection distribution line two ends；
The residual voltage and zero-sequence current are sampled by analog-digital converter；
Fourier transformation is carried out to sampled residual voltage and zero-sequence current；
Calculate between the residual voltage and the virtual value and the residual voltage and the zero-sequence current of the zero-sequence current
Angle value；
Judge that the angle value between the residual voltage and the zero-sequence current whether in preset range, is if so, then defined as
Faulty section.
2. power distribution network small resistor method for locating single-phase ground fault according to claim 1, it is characterised in that
Angle value between the residual voltage and the zero-sequence current is calculated using equation below：
Wherein, U0Represent zero-sequence current, I0Represent residual voltage,Represent the angle between residual voltage and zero-sequence current.
3. power distribution network small resistor method for locating single-phase ground fault according to claim 1, it is characterised in that
The zero-sequence current at collection distribution line two ends and the concrete steps of residual voltage include：
The zero-sequence current at distribution line two ends, and the event of Jing secondary sides are gathered by zero sequence current mutual inductor a switch cubicle side
Barrier earth plate is transmitted to analog-digital converter；
The residual voltage at distribution line two ends is gathered by electronic voltage transducer a switch cubicle side, and is transmitted after no-load voltage ratio
To on the fault ground base plate of secondary side；
Residual voltage on fault ground base plate amplifies Jing after voltage follower isolation into difference amplifier；
Residual voltage Jing after difference amplifier amplifies is carried out being exported to analog-digital converter after signal condition.
4. power distribution network small resistor method for locating single-phase ground fault according to claim 3, it is characterised in that
The no-load voltage ratio is
5. power distribution network small resistor method for locating single-phase ground fault according to claim 1, it is characterised in that
The preset range is 175 °～325 °.
6. a kind of distribution terminal, it is characterised in that include：
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
The zero-sequence current after its conversion is received, into small current, is gathered for distribution terminal for by distribution high-tension line high current no-load voltage ratio；
Primary side electronic voltage transducer：The fault ground plate of distribution terminal receives the residual voltage after its conversion, adopts
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 thereon, together the function of single-phase earthing judgement.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, receives from once setting
Residual voltage signal after the conversion of standby electronic voltage transducer, further carries out entering difference after voltage follower isolation
Amplifier amplifies, and the residual voltage Jing after difference amplifier amplifies is carried out after signal condition, 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
Angle value between pressure and the zero-sequence current is then defined as faulty section whether in preset range, if so,.
7. distribution terminal according to claim 6, it is characterised in that the fault ground plate includes calculator, the meter
Calculate the angle value that device is calculated between the residual voltage and the zero-sequence current using equation below：
Wherein, U0Represent zero-sequence current, I0Represent residual voltage,Represent the angle between residual voltage and zero-sequence current.
8. distribution terminal according to claim 6, 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 the fault ground plate of Jing secondary sides is transmitted to simulation
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 Jing after voltage follower isolation into difference amplifier, and
Residual voltage Jing after difference amplifier amplifies is carried out being exported to analog-digital converter after signal condition.
9. distribution terminal according to claim 8, it is characterised in that the no-load voltage ratio is
10. distribution terminal according to claim 6, it is characterised in that the preset range is 175 °～325 °.
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| CN201611066976.4A CN106646120A (en) | 2016-11-25 | 2016-11-25 | Distribution network small resistance single phase grounding fault positioning method and power distribution terminal |
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| CN201611066976.4A CN106646120A (en) | 2016-11-25 | 2016-11-25 | Distribution network small resistance single phase grounding fault positioning method and power distribution terminal |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107516877A (en) * | 2017-08-23 | 2017-12-26 | 广州供电局有限公司 | Small resistance grounding system failure protecting device, system and method |
| CN107643720A (en) * | 2017-08-26 | 2018-01-30 | 深圳市盛路物联通讯技术有限公司 | A kind of monitoring method and controller based on Internet of Things |
| CN108008234A (en) * | 2017-11-10 | 2018-05-08 | 安徽徽远成电气科技股份有限公司 | Single-phase earthing defends managing device |
| CN108535597A (en) * | 2018-04-13 | 2018-09-14 | 国网福建省电力有限公司 | Singlephase earth fault Section Location based on circuit model |
| CN110161354A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of ground fault method of discrimination and device |
| CN112731248A (en) * | 2020-12-29 | 2021-04-30 | 国网四川省电力公司电力科学研究院 | Electronic distribution automation feeder terminal test conversion equipment |
| CN113138355A (en) * | 2021-04-23 | 2021-07-20 | 珠海博威智能电网有限公司 | Distribution automation terminal for ground fault judgment and ground fault judgment method |
| CN114215515A (en) * | 2021-12-16 | 2022-03-22 | 国家能源集团乌海能源有限责任公司 | Coal mining machine fault method, system and storage medium |
| CN114764599A (en) * | 2022-04-26 | 2022-07-19 | 国网四川省电力公司电力科学研究院 | Sensitivity analysis method and system for single-phase earth fault of power distribution network |
| CN116973680A (en) * | 2023-07-21 | 2023-10-31 | 国网宁夏电力有限公司银川供电公司 | Low-current grounding line selection device, system and fault line investigation method |
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| CN116973680A (en) * | 2023-07-21 | 2023-10-31 | 国网宁夏电力有限公司银川供电公司 | Low-current grounding line selection device, system and fault line investigation method |
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Address after: 179 No. 225009, Weiyang Road, Jiangsu, Yangzhou Applicant after: YANGZHOU POWER SUPPLY BRANCH OF STATE GRID JIANGSU ELECTRIC POWER Co.,Ltd. Applicant after: ZHUHAI XJ ELECTRIC Co.,Ltd. Applicant after: STATE GRID CORPORATION OF CHINA Address before: 179 No. 225009, Weiyang Road, Jiangsu, Yangzhou Applicant before: YANGZHOU POWER SUPPLY COMPANY, STATE GRID JIANGSU ELECTRIC POWER Co. Applicant before: ZHUHAI XJ ELECTRIC Co.,Ltd. Applicant before: State Grid Corporation of China |
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Application publication date: 20170510 |