CN107271775A - A kind of power overhead network phase shift inspection method - Google Patents
A kind of power overhead network phase shift inspection method Download PDFInfo
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- CN107271775A CN107271775A CN201710472384.0A CN201710472384A CN107271775A CN 107271775 A CN107271775 A CN 107271775A CN 201710472384 A CN201710472384 A CN 201710472384A CN 107271775 A CN107271775 A CN 107271775A
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- phase
- voltage
- phase shift
- transmission line
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
- G01R25/005—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller, or for passing one of the input signals as output signal
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses power overhead network phase shift inspection method, belong to field of power.Operating personnel face the technical problem of Personal Risk and the easy breakdown infringement of operating instrument in high induced potential environment in the circuit that solution prior art is present.The present invention come the terminal voltage of measurement line one, will detect that phase one end ground connection observes the technological means of the change of voltage to determine whether same phase using capacitance partial pressure method, if voltage declines, and illustrate for same phase, if not otherwise being same phase.The technological means of use conveniently, safely, it is efficient, time saving and energy saving, the person and the dangerous technical problem of instrument can be satisfactorily resolved present in prior art, the technical assignment of overhead transmission line phase shift inspection is completed.
Description
Technical field
The invention belongs to technical field of power systems, and in particular to a kind of power overhead network phase shift inspection method.
Background technology
Ultra-high-tension power transmission line is typically distributed across the changeable area of with a varied topography, weather conditions.Failure easily occurs, line walking inspection
Repair difficulty.At present, must be according to GB 50150-2016 after power system overhead transmission line is installed《Electric device installing engineering is electrically set
Standby commissioning test standard》Regulation, completes overhead transmission line and checks phase.
At this stage, phase conventional selection universal meter or Phase Detector are checked, Phase Detector is applied to power circuit, become
The phase bit check and phase sequence checking of electric institute, with functions such as nuclear phase, survey phase sequence, electrical verifications.Possess very strong anti-interference, meet
（EMC）Standard requirement, adapts to various interference of electromagnetic field occasions.Tested high-voltage phase signal is taken out by collector, by processing
Directly launch afterwards.Line phase of going forward side by side is received by receiver to compare, it is qualitative to the result after nuclear phase.
Nowadays conventional inspection method is that when induced electricity is smaller, any phase of circuit one end is first grounded, then, with shaking
Table or universal meter measure resistance over the ground, detect resistance it is smaller when, explanation is same phase.Otherwise, same phase it is not.Sense
When answering electric larger, the power end of nuclear phase inspection circuit is being treated, is first taking apart and appoints a two-phase, then in another termination for treating nuclear phase inspection circuit
One phase voltage transformer.Working voltage, when opposite end voltage transformer secondary detects working voltage, explanation are added in power end
It is same phase.Otherwise, same phase it is not.
Therefore, conventional inspection method uses megger or universal meter, and application is complicated, and due to high voltage power transmission
Circuit parallel and staggeredly, cross over so that induced voltage is formed on test line, this induced voltage can give testing crew and examination
Test instrument and cause certain infringement, extremely dangerous under such a environment and inconvenience.
Prior art discloses some overhead transmission line phase shift inspection methods.
Document（" the phase shift inspection test method and points for attention of cable run ", hippology China etc., power and electrical engineering, 2
016 year the 6th phase）Phase shift inspection method is disclosed, phase is checked using battery method, the line-to-ground disconnecting link at cable two ends is drawn
Open, cable is substantially discharged.Offside three-phase is all hanging.In one end of cable, A connects battery anode, and B connects battery
Group negative pole;In the other end of cable, any two-phase cored wire, when D.C. voltmeter just rises, direct current are measured with D.C. voltmeter
Table just extremely A phases are pressed, negative pole is B phases, and remaining phase is then C phases.
When checking phase using insulation resistance meter method, the line-to-ground disconnecting link at cable two ends is pulled open, cable is fully put
Electricity, offside three-phase is all hanging, and measurement line one is terminated into insulation resistance meter " L " end, another termination insulating bar, insulation resistance meter
" E " end ground connection.Notify offside personnel that cable wherein one mutually is grounded into (by taking A phases as an example), another two-phase air switch.Testing crew driving is exhausted
Edge ohmmeter, distinguishes spliced cables three-phase cored wire, cored wire when insulaion resistance is zero is A phases by insulating bar, after experiment is finished, will
Insulating bar departs from cable A phases, then stops insulation resistance meter.To cable discharge and record.Complete after aforesaid operations, notify offside examination
Test personnel and ground wire is connected on another phase of circuit, repeat aforesaid operations, until three-phase is once grounded.
As described above, the above method is determined using voltmeter or insulation resistance meter, method for detecting phases is in the stronger of formation
Induced potential in the environment of carry out, testing staff can not break away from the operation of danger, and operating instrument has breakdown danger
Danger.
The A of Publication No. CN 103983853 patent document discloses a kind of high-tension cable and hands over adopted interacted system phase inspection
Checking method, the inventive method includes:Step 1:Testing staff carries out wiring in the first section of high-tension cable;Step 2:Testing staff arrives
No. 1 joint case of high-tension cable carries out phase shift inspection to cross interconnected system;Step 3:Testing staff connects to No. 2 of high-tension cable
Head case carries out phase shift inspection to cross interconnected system;Step 4:Above step is repeated, until completing whole cross interconnected systems
Phase shift inspection works.
The step 1:First, testing staff carries out wiring in the first section of high-tension cable.The a phases of protective metal shell are directly connect
Ground, passes through 100 ohm of resistance eutral grounding by b phases, and c phase is vacantly earth-free.
The step 2:Testing staff carries out phase shift inspection to No. 1 joint case of high-tension cable to cross interconnected system.No. 1
At joint case, cable connector can be led to the protective metal shell of two sections of cables respectively by coaxial cable cross interconnected when constructing
Case, therefore have the phase of core 3 and the phase of outer core 3 in 6 phases, i.e. coaxial cable.With resistance (ohm) shelves of universal meter, difference is over the ground
Measure the inside and outside core of coaxial cable, now resistance be zero be then cable head a phases, resistance is about 100 ohm for b
Phase, c phase resistances are infinitely great, and the resistance of remaining 3 phase core (al, bl, cl) is also infinity, and the 3 phase core points to No. 2 joints
Case.The al phases of protective metal shell are directly grounded again, b1 phases are passed through to 100 ohm of resistance eutral grounding, c1 phases are hanging earth-free, under
The work of one step phase shift inspection is prepared.
From the foregoing, it will be observed that above-mentioned technical proposal is in detection, by 100 ohm of resistance eutral grounding, using multitester measuring electricity
Resistance, determining instrument works in the environment of dangerous induced potential, and not only staff can not avoid construction risk, moreover, also
There is the technical problem that instrument punctures.
The content of the invention
To ensure the safety of the person and tester, summing up experience is repeatedly practised in actual work at the scene for we, finally
It has found a kind of power overhead network phase shift inspection method.The method is simple and practical, simply and economically can timely complete induced electricity
Larger overhead transmission line phase verification work.
When tested power overhead network is earth-free, the alternating voltage of power overhead network over the ground hinders according to direct-to-ground capacitance
Anti- size distribution.After power circuit one end is grounded, high-tension overhead line direct-to-ground capacitance changes, power overhead network pair
The alternating voltage on ground also changes.
Such as Fig. 1, connected by main capacitance 1 and derided capacitors 2, overhead transmission line is detected in circuit one end using capacitance partial pressure method
Induced voltage.Phase to be detected is grounded respectively in the circuit other end, when detecting voltage decline, explanation is same and maked somebody a mere figurehead
Line, phase is identical；When detecting that voltage does not change, illustrate it is not same overhead line, phase is different.
The beneficial effects of the invention are as follows：
1st, power system installation or overhead transmission line set up terminate after, it is necessary to check phase according to national standard, and existing skill
Art checks the method for phase routinely using the instrument such as universal meter or detector, and overhead transmission line parallel and staggeredly waits erection side
Formula produces higher induced potential on the line, and what is had threatens the personal safety of staff, and comes for detecting instrument
Say also there is breakdown danger.In order to overcome above mentioned problem, found out in long-term engineering practice and come a kind of safety, height
Effect, easy, practical overhead transmission line phase shift inspection method.This method determines voltage using capacitance partial pressure, only by connecing
Ground, determine voltage whether change can quickly, accurately, be safely completed work；
2nd, the switching overvoltage stopped in transmission process is avoided, guarantee is provided for power system security is stable；
3rd, stop power transmission without circuit, save the operating time；
4th, compare conventional phase inspection, without scheduling, O＆M, the participation for detecting more personnel, save manpower.
Brief description of the drawings
Fig. 1, power overhead network check phase method voltage check device connection figure；
Fig. 2, power overhead network phase shift inspection schematic diagram.
Embodiment
For a better understanding of the present invention, present disclosure, but this hair are further fairly set out with reference to embodiment
Bright protection content is not limited solely to the following examples.In the following description, give a large amount of concrete details so as to
More thorough understanding of the invention is provided.It will be apparent, however, to one skilled in the art that the present invention can be with
It is carried out without one or more of these details.
This method is described further below in conjunction with the accompanying drawings.
Such as Fig. 1, the installation for realizing high-voltage detecting device is followed the steps below：First, low capacity high-voltage capacitance is selected
（1000pF、10kV）As main capacitance, using two Large Copacity low-voltage capacitances (0.02 μ F, 400V) as derided capacitors, by three
Branch electric capacity Series connection welding is together.By Q=CU, U is knownIt is main=UPoint*10000/1000=100 UPoint。
Then, by the capacitor after series connection loaded in pvc pipe, and with binding post fixed capacity device outer lead.
See Fig. 2, using and method of discrimination it is as follows：
1st, overhead transmission line two-terminal-grounding disconnecting link is pulled open, overhead transmission line is hanging；
2nd, test clerk is in one end second of overhead transmission line 1, first by the side joint of device low tension 5.Again the device high pressure
The side lead of electric capacity 4 is overlapped in any phase of overhead line with insulating bar；
3rd, this device low-voltage capacitance voltage indicated value is detected, and is recorded；Advise By Wire is mutually grounded respectively to end line first, is connect
Ground operation can connect flexible circuit conductor 3 by insulating bar 2 and carry out, if now voltage meter 6 indicates there is decline, illustrate wire two ends phase
Position is consistent, is same wire.If voltage meter does not change, illustrate that wire two ends phase is inconsistent, be not same wire.
According to this, phase verification work is completed, inspection phase purpose is reached.
Following test voltage arrives line side voltage for conversion.
Embodiment 1
Table 1
As seen from the above table, checked using phase shift inspection method of the present invention, above step is carried out to three-phase successively, can be with
Find out, when checking A phases, test voltage drops to 21v, therefore, draws a conclusion as A phases, and same principle draws other two-phases
Verification.
Embodiment 2
Table 2
As seen from the above table, checked using phase shift inspection method of the present invention, above step is carried out to three-phase successively, can be with
Find out, when checking A phases, test voltage drops to 6v, therefore, draws a conclusion as A phases, and same principle draws other two-phases
Verification.
Embodiment 3
Table 3
As seen from the above table, checked using phase shift inspection method of the present invention, above step is carried out to three-phase successively, can be with
Find out, when checking A phases, test voltage drops to 12v, therefore, draws a conclusion as A phases, and same principle draws other two-phases
Verification.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, this area is common
Other modifications or equivalent substitution that technical staff is made to technical scheme, without departing from technical solution of the present invention
Spirit and scope, all should cover among scope of the presently claimed invention.
Claims (4)
1. a kind of power overhead network phase shift inspection method, it is characterised in that including：
Step one, the voltage of overhead transmission line one end is determined；
Step 2, the overhead transmission line other end is grounded, and whether observation voltage declines, and in this way, is then judged as same phase, if not, sentencing
Break as different phases.
2. a kind of power overhead network phase shift inspection method as claimed in claim 1, it is characterised in that wherein step one is wrapped
Include, selection low capacity high-voltage capacitance is as main capacitance, using Large Copacity low-voltage capacitance as derided capacitors, by electric capacity series welding
Connect；By the capacitor after series connection loaded in pvc pipe, and with binding post fixed capacity device outer lead.
3. a kind of power overhead network phase shift inspection method as claimed in claim 2, it is characterised in that in step one, will
Overhead transmission line two-terminal-grounding disconnecting link is pulled open, and overhead transmission line is hanging；In overhead transmission line one end first by low-voltage capacitance side joint, then height
Voltage capacitance side lead is overlapped in any phase of overhead line with insulating bar, recording voltage indicated value.
4. a kind of power overhead network phase shift inspection method as claimed in claim 1, it is characterised in that in step 2, frame
The ceases to be busy road other end is mutually grounded respectively, and connecting flexible circuit conductor by insulating bar operates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710472384.0A CN107271775B (en) | 2017-06-21 | 2017-06-21 | electric power overhead line phase detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710472384.0A CN107271775B (en) | 2017-06-21 | 2017-06-21 | electric power overhead line phase detection method |
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| CN107271775A true CN107271775A (en) | 2017-10-20 |
| CN107271775B CN107271775B (en) | 2020-01-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983522A (en) * | 2020-08-26 | 2020-11-24 | 广东韶钢松山股份有限公司 | Cable detection method |
| CN113162040A (en) * | 2021-04-29 | 2021-07-23 | 西安热工研究院有限公司 | System and method for non-pressure nuclear phase of high-voltage station power supply of power plant |
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| CN101644730A (en) * | 2009-08-25 | 2010-02-10 | 广东电网公司广州供电局 | Circuit nuclear-phase method |
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| CN101644730A (en) * | 2009-08-25 | 2010-02-10 | 广东电网公司广州供电局 | Circuit nuclear-phase method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983522A (en) * | 2020-08-26 | 2020-11-24 | 广东韶钢松山股份有限公司 | Cable detection method |
| CN111983522B (en) * | 2020-08-26 | 2023-01-06 | 广东韶钢松山股份有限公司 | Cable detection method |
| CN113162040A (en) * | 2021-04-29 | 2021-07-23 | 西安热工研究院有限公司 | System and method for non-pressure nuclear phase of high-voltage station power supply of power plant |
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| CN107271775B (en) | 2020-01-31 |
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