CN106501674A - Medium voltage distribution network single-phase earth fault positioning device and its Fault Locating Method - Google Patents
Medium voltage distribution network single-phase earth fault positioning device and its Fault Locating Method Download PDFInfo
- Publication number
- CN106501674A CN106501674A CN201610925800.3A CN201610925800A CN106501674A CN 106501674 A CN106501674 A CN 106501674A CN 201610925800 A CN201610925800 A CN 201610925800A CN 106501674 A CN106501674 A CN 106501674A
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- China
- Prior art keywords
- distribution network
- voltage distribution
- medium voltage
- ground wire
- earth fault
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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
-
- 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 invention discloses a kind of medium voltage distribution network single-phase earth fault positioning device and its localization method, the positioner includes adjustable direct voltage source, high-voltage current measurement instrument, connects netting twine and ground wire, the cathode output end of the adjustable direct voltage source connects one end of netting twine, cathode output end electrically connects one end of ground wire, the other end for connecing netting twine is used for the first section main feeder most head end for electrically connecting medium voltage distribution network, the other end of the ground wire is used for being grounded, and the high-voltage current measurement instrument is used for measuring the loop current on the ground wire.During the localization method fault location, switching manipulation number of times is few, and positioning is quick, need not experience an of short duration power failure, power transmission, the process having a power failure, little to user and electrical equipment impact.
Description
Technical field
A kind of the present invention relates to Distribution Fault Location System, more particularly to medium voltage distribution network singlephase earth fault positioning dress
Put and its Fault Locating Method.
Background technology
Singlephase earth fault quickly determines faulty line pair in distribution occurrence probability highest, when there is singlephase earth fault
Improve reliability significant.For many years, (neutral point is not using small current neutral grounding for China's intermediate distribution system major part
Ground connection, through high resistance ground and through grounding through arc) method of operation, occur singlephase earth fault after, middle voltage distribution networks bus zero sequence
Voltage gets over report from a liner police, but system may continue to run 0.5-2 hours.Recently as the iterative method of medium voltage distribution network transformation,
Middle voltage distribution networks grid structure is increasingly healthy and strong, controller switching equipment is caused in order to reduce non-faulting phase-to-ground voltage rising after single-phase earthing
Serious harm and fault spread, after many at present local electric companies forbid single-phase grounded malfunction in grounded system of low current, in
Press-fitting electrical network continues to run with 0.5-2 hours, generally carries out failure line selection using open line method etc., faulty line is exited fortune from system
OK, then trouble hunting is carried out.
With the fast development of distribution automation technology, user it is also proposed higher requirement, big portion to power supply reliability
Point medium-voltage distribution circuit has all carried out segment design and ring network power supply design (looped network designs radial operation).Therefore, work as distribution
After net occurs singlephase earth fault, it is one on the circuit of several kilometers long (main feeder and branch's line length sums) to find trouble point
The thing that part is wasted time and energy very much.Therefore quickly determine fault section, significant to improving Distribution Network Reliability.
According to grid company《Low and medium voltage distribution network planning and designing fire protection technology》：10kV overhead transmission lines backbone should be according to line
Road length and power load distributing situation carry out segmentation, when in circuit trunk section public distribution transforming more than 5 (10kV numbers of users more than 5 families,
Transformer total capacity be more than 2000kVA) or line length more than 2km when install waypoint at, long overhead transmission line backbone can
1 to 3 grade is arranged using pole-mounted circuit breaker and possesses the waypoint of protection, remaining waypoint adopts on-load switch.Pole type transformer
Should near load point or load center, three-phase transformer capacity is from 100,200,400kVA.According to grid company《Mesolow is matched somebody with somebody
Study on Power Grid Planning fire protection technology》Certain medium voltage distribution network wiring diagram of design is as shown in Figure 1.
In Fig. 1, the section of each distribution can only include some distribution transformings, or only include some branch feeders, or include
Some distribution transformings or some branch feeders, distribution transforming number of units and branch's feedback bar number and capacity will meet《Low and medium voltage distribution network planning and designing
Fire protection technology》.
Medium voltage distribution network individual event earth fault section is searched generally using the method for trying step by step to send coordinated with scheduling at present,
When having residual voltage to report to the police, the section is fault section.The method needs the online all segmentations of disconnection medium-voltage distribution first to open
Close, then from the beginning of power supply, progressively try to close to each branch road end.Not only often, and certain customers are (single for switchgear operation
User in the section of phase access area) an of short duration power failure, power transmission, the process having a power failure is experienced, big to user and electrical equipment impact.
Content of the invention
The invention provides a kind of medium voltage distribution network single-phase earth fault positioning device and its Fault Locating Method, which overcomes
The deficiencies in the prior art described in background technology.
One of the technical solution adopted for the present invention to solve the technical problems is：
Medium voltage distribution network single-phase earth fault positioning device, the medium voltage distribution network are opened by segmentation from circuit head end to tail end
Pass carries out Discrete control step by step and forms each section feeder line and by branch switch to respective section main feeder pair to circuit main feeder
The branch feeder that answers carries out Branch control, the positioner includes adjustable direct voltage source, high-voltage current measurement instrument, connect netting twine and
Ground wire, the cathode output end of the adjustable direct voltage source connect one end of netting twine, and cathode output end electrically connects ground wire
One end, the other end for connecing netting twine is used for electrically connecting the first section main feeder most head end of medium voltage distribution network, the ground wire
The other end be used for being grounded, the high-voltage current measurement instrument is used for measuring loop current on the ground wire.
Among one embodiment：The high-voltage current measurement instrument carries clamp current measurement head.
Among one embodiment：The ground wire is by being grounded drill rod ground connection.
Among one embodiment：The other end for connecing netting twine is carried to be used for connecting the first section of medium voltage distribution network main feeder most
The wire clamp of head end.
The two of the technical solution adopted for the present invention to solve the technical problems are：
Based on the Fault Locating Method of the medium voltage distribution network single-phase earth fault positioning device described in one of technical scheme, wrap
Include：
Step 1, the other end for connecing netting twine is electrically connected on the first section main feeder most head end of medium voltage distribution network, will ground connection
The other end ground connection of line；
Step 2, the loop measurement head of high-voltage current measurement instrument being connected on ground wire；
Step 3, opens adjustable direct voltage source, adjusts output voltage values first, then from medium voltage distribution network circuit tail end
It is zero up to the electric current indicating value in high-voltage current measurement instrument to disconnect branch switch and block switch successively step by step to head end direction, then
Can determine whether on the branch feeder corresponding to branch switch of earth fault generation in the last disconnection or the earth fault is sent out
Life is between adjacent two block switch for finally disconnecting twice on corresponding section feeder line.
Compared with background technology, it has the advantage that the technical program：
During fault location, switching manipulation number of times is few, and positioning is quick, need not experience an of short duration power failure, power transmission, have a power failure
Process is little to user and electrical equipment impact.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is certain the medium voltage distribution network wiring diagram described in background technology.
Attaching figures of the Fig. 2 for the positioner described in the present embodiment on power distribution network.
Fig. 3 is the singlephase earth fault conspectus described in a preferred embodiment.
Fault location measure loops of the Fig. 4 for Fig. 3 singlephase earth fault circuits.
Fig. 5 is the singlephase earth fault conspectus described in another preferred embodiment.
Fault location measure loops of the Fig. 6 for Fig. 5 singlephase earth fault circuits.
Fig. 7 is the circuit structure block diagram of the high-voltage current measurement instrument described in the present embodiment.
Specific embodiment
Medium voltage distribution network single-phase earth fault positioning device, the medium voltage distribution network are opened by segmentation from circuit head end to tail end
Pass carries out Discrete control step by step and forms each section feeder line and by branch switch to respective section main feeder pair to circuit main feeder
The branch feeder that answers carries out Branch control.
Fig. 2 is refer to, the positioner includes adjustable direct voltage source 1, high-voltage current measurement instrument 2, connects netting twine 3 and be grounded
Line 4, the cathode output end of the adjustable direct voltage source 1 connect one end of 3 line of net, and cathode output end electrically connects ground wire 4
One end, the other end for connecing netting twine 3 is used for electrically connecting the first section main feeder most head end of medium voltage distribution network, the ground wire
4 other end is used for being grounded, and the high-voltage current measurement instrument 2 is used for measuring the loop current on the ground wire.
In the present embodiment, 2 instrument of the high-voltage current measurement carries clamp current measurement 21, during use, directly by clamp
Current measurement 21 snaps in ground connection line loop.As shown in fig. 7, the high-voltage current measurement instrument 2 also includes single-chip microcomputer 22, charge and discharge
Electric module 23, lithium battery group 24, charging inlet 25, A/D converter 26, display screen 27 and buzzer 28, the clamp current measurement
21 connection A/D converters 26, the A/D converter 26 connect the input port of single-chip microcomputer 22, the display screen 27 and buzzer 28
The output port of connection single-chip microcomputer 22, the connection charge-discharge modules 23 of lithium battery group 24 simultaneously give single-chip microcomputer 22 through charge-discharge modules 23
Power supply, the charging inlet 25 are charged to lithium battery group 24 for connecting external power supply.
In the present embodiment, the ground wire 4 is convenient by being grounded drill rod ground connection, grafting.
In the present embodiment, the other end for connecing netting twine 3 is carried to be used for connecting the first section of medium voltage distribution network main feeder most
The wire clamp of head end, during use, wire clamp is clipped on distribution network line.
Based on the fault location principle of above-mentioned medium voltage distribution network single-phase earth fault positioning device it is：
After there is singlephase earth fault in medium voltage distribution network section as shown in Figure 2, earth point, main feeder, branch feeder,
Greatly, ground connection drill rod can form loop with netting twine is connect, and after adjustable direct voltage source 1 pressurizes, high-voltage current measurement instrument 2 has registration
And report to the police (current value exceedes given threshold alarm).As the earth resistance size of single-phase earthing is indefinite, (single-phase earthing is not
All it is physical grounding, the even arcing ground having needs high voltage that arcing ground electric discharge could occur), therefore required
The voltage output of adjustable direct voltage source 1 is also different.
Based on the Fault Locating Method of above-mentioned medium voltage distribution network single-phase earth fault positioning device, comprise the steps：
Step 1, the other end for connecing netting twine 3 is electrically connected on the first section main feeder most head end of medium voltage distribution network, will be connect
The other end ground connection of ground wire 4；
Step 2, the loop measurement head of high-voltage current measurement instrument 1 being connected on ground wire；
Step 3, opens adjustable direct voltage source 1, adjusts output voltage values first, then from medium voltage distribution network circuit tail end
It is zero up to the electric current indicating value in high-voltage current measurement instrument 2 to disconnect branch switch and block switch successively step by step to head end direction,
Then can determine whether on the branch feeder corresponding to branch switch of earth fault generation in the last disconnection or the earth fault
Generation is between adjacent two block switch for finally disconnecting twice on corresponding section feeder line；Period, according to line condition need
Adjustable direct voltage source to be adjusted 1 output voltage (due to the earth resistance size of single-phase earthing indefinite, and be all not thing
Rationality is grounded, the even arcing ground having, and needs high voltage that arcing ground electric discharge could occur) so that earth-return circuit
Electric current reaches the alarm threshold value of high-voltage current measurement instrument 2.
In one preferable examples, line single phase grounding failure as shown in Figure 3, it is assumed that section 4 occurs single-phase earthing, opens in branch
Before closing 4 openings, loop shown in dotted line in Fig. 4 can be formed, therefore high-voltage current measurement instrument 2 has current value.When branch switch 4 is opened
Afterwards, loop disconnects, 2 current vanishes of high-voltage current measurement instrument, and thus failure judgement section is section 4.
In another preferable examples, line single phase grounding failure as shown in Figure 5, it is assumed that section 2 occurs single-phase earthing, can be formed
Loop shown in dotted line in Fig. 6, it then follows " progressively disconnect block switch from circuit tail end to circuit head end (mains side) and branch opens
The rule of pass ", disconnects branch switch 4 first, and after branch switch 4 disconnects, failure cuts off (trouble point is in section 2) not yet, therefore
High-voltage current measurement instrument 2 has current value, still has chimes of doom.Continue to disconnect block switch 2, failure is cut off not yet, disconnect segmentation and open
After closing 1, singlephase earth fault is removed, and current loop disconnects, 2 current vanishes of high-voltage current measurement instrument, and chimes of doom disappears.With this
Judge, failure occurs between block switch 1 and block switch 2, i.e., section 2 is fault section.
The above, only present pre-ferred embodiments, therefore the scope of present invention enforcement can not be limited according to this, i.e., according to
Equivalence changes and modification that the scope of the claims of the present invention and description are made, all still should belong in the range of the present invention covers.
Claims (5)
1. medium voltage distribution network single-phase earth fault positioning device, the medium voltage distribution network pass through block switch from circuit head end to tail end
Circuit main feeder is carried out Discrete control step by step formed each section feeder line with by branch switch corresponding to respective section main feeder
Branch feeder carry out Branch control, it is characterised in that：The positioner includes adjustable direct voltage source, high-voltage current measurement
Instrument, netting twine and ground wire is connect, the cathode output end of the adjustable direct voltage source connects one end of netting twine, cathode output end electricity
One end of connection ground wire, the other end for connecing netting twine are used for the first section main feeder most head end for electrically connecting medium voltage distribution network
On, the other end of the ground wire is used for being grounded, and the high-voltage current measurement instrument is used for measuring the loop current on the ground wire.
2. medium voltage distribution network single-phase earth fault positioning device according to claim 1, it is characterised in that：The high-tension electricity
Flow gauge carries clamp current measurement head.
3. medium voltage distribution network single-phase earth fault positioning device according to claim 1, it is characterised in that：The ground wire
By being grounded drill rod ground connection.
4. medium voltage distribution network single-phase earth fault positioning device according to claim 1, it is characterised in that：Described connect netting twine
The other end with for connecting the wire clamp of medium voltage distribution network the first section main feeder most head end.
5. the Fault Locating Method of medium voltage distribution network single-phase earth fault positioning device as claimed in claim 1, its feature exist
In：Including：
Step 1, the other end for connecing netting twine is electrically connected on the first section main feeder most head end of medium voltage distribution network, by ground wire
The other end is grounded；
Step 2, the loop measurement head of high-voltage current measurement instrument being connected on ground wire；
Step 3, opens adjustable direct voltage source, adjusts output voltage values first, then from medium voltage distribution network circuit tail end to head
It is zero up to the electric current indicating value in high-voltage current measurement instrument that extreme direction disconnects branch switch and block switch successively step by step, then can sentence
On branch feeder that the earth fault of breaking occurs corresponding to the branch switch in the last disconnection or the earth fault occurs to exist
Between adjacent two block switch for finally disconnecting twice on corresponding section feeder line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610925800.3A CN106501674A (en) | 2016-10-24 | 2016-10-24 | Medium voltage distribution network single-phase earth fault positioning device and its Fault Locating Method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610925800.3A CN106501674A (en) | 2016-10-24 | 2016-10-24 | Medium voltage distribution network single-phase earth fault positioning device and its Fault Locating Method |
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| CN106501674A true CN106501674A (en) | 2017-03-15 |
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| CN201610925800.3A Pending CN106501674A (en) | 2016-10-24 | 2016-10-24 | Medium voltage distribution network single-phase earth fault positioning device and its Fault Locating Method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627735A (en) * | 2018-07-26 | 2018-10-09 | 浙江德辉电力安装工程有限公司 | A kind of fast accurate searches the method and detection device of Single-phase Ground Connection Failure |
| CN112557805A (en) * | 2020-10-29 | 2021-03-26 | 广西电网有限责任公司南宁供电局 | Auxiliary device and method for quickly searching faults of overhead line |
| CN113917288A (en) * | 2021-12-14 | 2022-01-11 | 国网辽宁省电力有限公司电力科学研究院 | Starting method and device for matching single-phase earth fault line selection device of power distribution network |
| CN114142445A (en) * | 2021-11-26 | 2022-03-04 | 贵州电网有限责任公司 | Electrical operation trial sending method for preventing fault amplification |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108627735A (en) * | 2018-07-26 | 2018-10-09 | 浙江德辉电力安装工程有限公司 | A kind of fast accurate searches the method and detection device of Single-phase Ground Connection Failure |
| CN112557805A (en) * | 2020-10-29 | 2021-03-26 | 广西电网有限责任公司南宁供电局 | Auxiliary device and method for quickly searching faults of overhead line |
| CN114142445A (en) * | 2021-11-26 | 2022-03-04 | 贵州电网有限责任公司 | Electrical operation trial sending method for preventing fault amplification |
| CN114142445B (en) * | 2021-11-26 | 2024-04-05 | 贵州电网有限责任公司 | Electrical operation test-feeding method for preventing fault expansion |
| CN113917288A (en) * | 2021-12-14 | 2022-01-11 | 国网辽宁省电力有限公司电力科学研究院 | Starting method and device for matching single-phase earth fault line selection device of power distribution network |
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