CN107179467B - GIL Fault Locating Method and fault location system based on earth current - Google Patents
GIL Fault Locating Method and fault location system based on earth current Download PDFInfo
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- CN107179467B CN107179467B CN201710351520.0A CN201710351520A CN107179467B CN 107179467 B CN107179467 B CN 107179467B CN 201710351520 A CN201710351520 A CN 201710351520A CN 107179467 B CN107179467 B CN 107179467B
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
A kind of GIL Fault Locating Method and fault location system based on earth current when internal short-circuit occurs for GIL, requires to look up the gas chamber of short circuit generation, to disassemble and to repair.Since GIL uses totally-enclosed metal structure and built-in disc insulator, direct fault location difficulty is larger, needs through fault signature indirect addressing.Common positioning method includes traveling wave positioning, localization by ultrasonic etc..The invention proposes a kind of positioning methods based on earth mat fault current feature, when passing through failure in GIL earth mat electric current amplitude and phase characteristic, identify location of short circuit.By the complementation of amplitude and phase criterion, solves the different horizontal earth mats of ground connection and give position bring difficulty.
Description
Technical field
The application (note: it includes three groups of inventions that this case, which belongs to an application) belongs to electric equipment operation maintenance technology field,
More particularly to a kind of GIL Fault Locating Method and system based on earth current, earth current power frequency when by GIL failure are special
Levy the position for determining short dot.
Background technique
SF6 gas-insulated metal closed power transmission line (GIL, Gas Insulated Line) is as a kind of novel transmission of electricity
Route has transmission line capability is big, occupied area is small, flexible arrangement, high reliablity, non-maintaining, long-life, effect on environment are small etc.
Plurality of advantages.The electric transmission line erection of special weather environment or Special zone can be solved the problems, such as using GIL mode.With oil-filled cable
It is compared with twisted polyethylene cable, the capacitance per unit length amount of GIL is small, and critical transmission range is long.The typical work of current country GIL
Journey case includes the logical extra-high voltage GIL of 800kV La Xiwa power station GIL and 1000kV Soviet Union, is tunnel mounting means.
GIL uses full-closed structure, it needs to be determined that the gas chamber of failure, evacuates the SF6 in fault gas chamber when line short
After gas, removes faulty section GIL and replace.It is time-consuming larger since the maintenance work of GIL is more complicated, accurately position GIL's
Abort situation is particularly significant, and avoidable mistake removes normal gas chamber, greatly shortens power failure processing time, remarkable in economical benefits.
In the prior art, traveling wave positioning principle uses high-speed sampling and high-precision GPS synchronization principles, passes through capacitive coupler
Voltage traveling wave when short circuit is obtained, the position of short dot is calculated by the time difference that voltage traveling wave is transferred to the two sides GIL.Traveling wave
Positioning principle device configuration is simple, it is only necessary to and in route two sides, configuration traveling wave acquires equipment, but GIL route lesser for overall length,
Accurate positioning requires sample frequency and synchronization accuracy higher, and the reliability of equipment is low.When occurring being struck by lightning or operating wave, traveling wave is fixed
Position principle is vulnerable to interference.
Localization by ultrasonic principle is super by laying along the line using the ultrasonic signal on piezoceramic transducer acquisition GIL shell
Sonic transducer segmentation captures the ultrasonic signal that fault current generates, and determines failure by the time difference that ultrasonic signal reaches sensor
Point position.Localization by ultrasonic mode anti-interference is preferable, but ultrasonic sensor higher cost, and reliability and service life are not as good as routine
Electrical quantity sensor.Since ultrasonic sensor output signal is small, wire length is limited, and acquisition device must be mounted on nearby
GIL housing adjacent.The time difference reached due to needing to judge signal, the ultrasound acquisition means of all fronts need synchronized sampling, system
Global reliability it is low.
Therefore, those skilled in the art need to provide a kind of method and system of GIL fault location, can reliably determine
GIL short dot position section, thus guided maintenance and maintenance work.
Summary of the invention
In order to solve the above technical problem present in existing engineering, this application provides a kind of based on earth current
GIL Fault Locating Method and system can reliably determine GIL short dot position section, thus guided maintenance and maintenance work.
The application specifically uses following technical scheme:
A kind of GIL Fault Locating Method based on earth current, it is characterised in that: electric current in GIL earth mat when passing through failure
Amplitude and phase characteristic, identify the location of short circuit of GIL.
A kind of GIL Fault Locating Method based on earth current, SF6 gas-insulated metal closed power transmission line GIL, shell
Body is fixed on the ground by support frame, provided underground grounding copper bar, and GIL shell and support frame access copper bar earth mat nearby；Its
Be characterized in that, the localization method the following steps are included:
Step 1: one measuring point being set every set distance along GIL, in each measuring point setting in-site collecting device for measuring
Flow through the electric current i.e. amplitude of earth current and phase of grounding copper bar at the measuring point；
Step 2: when meeting in-site collecting device enabling signal condition, then each in-site collecting set by starting step 1
Device, earth current amplitude and phase at each measuring point of in-site collecting；
Step 3: judging along the copper bar resistance of the unit length of the longitudinal direction GIL and the soil of unit length or concrete resistance
Ratio enters step 4, otherwise enters step 5 when the ratio is greater than preset resistance ratio threshold value；
Step 4: flowing through the earth current amplitude of copper bar according to each measuring point that step 2 acquires, find out earth current amplitude most
Big measuring point, the section between two measuring point of left and right adjacent with the measuring point are judged as GIL fault section；
Step 5: flowing through the earth current phase of copper bar according to each measuring point that step 2 acquires, find earth current phase phase
Anti- two neighboring measuring point, the section between two measuring point is GIL fault section.
Further,
In step 1, the electric current on grounding copper bar is acquired using the mode of shunting, i.e., the parallel shunt branch on grounding copper bar
Road obtains the current amplitude and phase on copper bar by way of acquiring diverter branch electric current.
In step 2, in-site collecting device enabling signal includes route protection action signal and the mutation of copper bar earth current
Signal is measured, route protection action signal and copper bar earth current Sudden Changing Rate signal are the logical relation of "or".
In step 2, after the starting of in-site collecting device, according to the current sample of 5 power frequency periods each before and after Startup time
Waveshape goes out earth current amplitude and phase.
In step 3, the setting length refers to 10 times of default positioning accuracy L i.e. 10L length, the preset resistance
Proportion threshold value is 10%.
Disclosed herein as well is a kind of GIL positioning systems based on aforementioned GIL Fault Locating Method, and technical solution is such as
Under:
A kind of GIL positioning system based on aforementioned GIL Fault Locating Method, the GIL positioning system include it is multiple on the spot
Acquisition device, data concentrator and fault location host；It is characterized by:
Multiple measuring points are set along the GIL that each waits for fault location, go out in-site collecting device is installed in each measuring point,
The in-site collecting device is for measuring the earth current for flowing through copper bar；
Each GIL route is correspondingly arranged a data concentrator, and the data concentrator is for receiving in this GIL route
Each in-site collecting device earth current signal collected；
All earth current signals in corresponding GIL route are uploaded to fault location host by each data concentrator,
GIL fault section is judged by fault location host.
Further, the in-site collecting device shunt line and acquisition terminal, the acquisition terminal are punching mutual inductor, point
Streamline is connected in parallel on grounding copper bar, and punching mutual inductor is set on shunt line.
It is connected by RS485 bus with power supply synchronous bus between each in-site collecting device.
Each data concentrator is connected by optical fiber.
The fault location host obtains the trip signal of route protection by MMS or GOOSE network.
Local mounted acquisition device is used for electrical connection and is pulled using the power frequency AC220V Alternating Current Power Supply on same bus
Hand connection type, acquisition device also acquire AC220V alternating supply voltage while acquiring copper bar electric current, use supply voltage
Reference phase as phase measurement.
Compared with prior art, the application has at least the following advantages:
The measured signal of GIL Fault Locating Method based on earth current and system is the big energy signal of power frequency, acquisition dress
It sets without special synchronous signal, sample frequency is low, and sensor life-time is long, and the requirement to acquisition system hardware is lower.Acquisition device
Respective independent startup and earth current waveform when recording failure, system entirety redundancy is big, and reliability is high.Using shunting
After mode obtains earth current, collector is mountable unrelated with GIL ontology near earth mat, easy for installation, convenient for the inspection of GIL
Repair maintenance.
Detailed description of the invention
Fig. 1 is GIL earthing mode schematic diagram in the prior art；
Fig. 2 is GIL earth current diffusion way schematic diagram；
Fig. 3 is that middle GIL earth current shunts acquisition principle schematic diagram；
Fig. 4 is GIL fault location system structural schematic diagram of the application based on earth current；
Fig. 5 is the flow diagram of GIL Fault Locating Method of the application based on earth current；
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Referring to Fig. 1, which is GIL earthing mode schematic diagram in the prior art.
GIL shell is fixed on the ground by support frame, and provided underground grounding copper bar, GIL shell and support frame are with regard to proximity
Enter copper bar earth mat.The ground resistance of the longitudinal direction GIL is mainly made of copper bar resistance, and lateral ground resistance is mainly electric resistance of soil or mixes
Solidifying soil resistance.
Referring to fig. 2, which is GIL earth current diffusion way schematic diagram in the prior art.It stretches since GIL shell exists
Structure is saved and is slidingly sealed, it cannot be guaranteed that the conductive continuity in the case of high current, current in the fault point is introduced into ground connection before entering ground
Copper bar is spread while along copper bar longitudinal propagation into soil, and since the sectional area of diffusing soil is very big, inductance can
It ignores, mainly the resistive component of soil.Longitudinal ground resistance of unit length refers to soil and copper in L meters of length
The resistance of row, since copper bar resistivity ratio soil is about 1,000,000,000 times low, when using 250 square millimeters of standard copper bars, longitudinal ground connection
Resistance is mainly by copper bar resistance.The lateral ground resistance of unit length refers to the equivalent of in L meters of length soil diffusing effect
Resistance, grounding copper bar are commonly attached to ground on the net, and the buried depth of earth mat is related to diffusing effect to the area of earth mat, it is contemplated that engineering
The constraint of cost, earth mat electric current must diffuse into certain area and be just able to satisfy diffusing design objective.
As shown in Fig. 5, this application discloses a kind of the GIL Fault Locating Method based on earth current, SF6 gas-insulated
Metal closed power transmission line GIL, shell are fixed on the ground by support frame, provided underground grounding copper bar, GIL shell and branch
Support accesses copper bar earth mat nearby；The localization method the following steps are included:
Step 1: one measuring point being set every set distance along GIL, in each measuring point setting in-site collecting device for measuring
Flow through the electric current i.e. amplitude of earth current and phase of grounding copper bar at the measuring point.
The electric current on grounding copper bar is acquired using the mode of shunting, i.e., the parallel shunt branch on grounding copper bar, by adopting
The mode of collection diverter branch electric current obtains current amplitude and phase on copper bar.
As shown in Fig. 3, copper bar can be obtained by fixed proportion by way of the parallel shunt branch on grounding copper bar
On current component, copper bar current component can be collected using punching mutual inductor, thus extrapolate on copper bar ground connection electricity
Stream.
Step 2: when meeting in-site collecting device enabling signal condition, then each in-site collecting set by starting step 1
Device, earth current amplitude and phase at each measuring point of in-site collecting；
In-site collecting device enabling signal includes route protection action signal and copper bar earth current Sudden Changing Rate signal, route
Protection signal and copper bar earth current Sudden Changing Rate signal are the logical relation of "or".
After the starting of in-site collecting device, by the current sample waveform of 5 each power frequency period each before and after Startup time, according to electric current
Sample waveform calculates earth current amplitude and phase.
Step 3: judging the soil or concrete resistance of the copper bar resistance and setting length along the setting length of the longitudinal direction GIL
Ratio enters step 4, otherwise enters step 5 when the ratio is greater than preset resistance ratio threshold value；
In step 3, when the preset positioning accuracy of the application is L meters, length is set as 10L meters, every 10L meters of copper bar
When resistance is less than the 10% of every 10L meters of soil or concrete resistance, then 5 are entered step；Every 10L meters of copper bar resistance is greater than every
10L meters of soil or concrete resistance 10% when, then enter step 4, wherein 10% is preset resistance ratio threshold value.
Step 4: flowing through the earth current amplitude of copper bar according to each measuring point that step 2 acquires, find out earth current amplitude most
Big measuring point, the section between two measuring point of left and right adjacent with the measuring point are judged as GIL fault section；
Decision logic are as follows: the earth current amplitude of each measuring point is compared one by one first, finds out the maximum survey of current amplitude
Then point N determines to be GIL fault section from measuring point N-1 to measuring point N+1.
Step 5: flowing through the earth current phase of copper bar according to each measuring point that step 2 acquires, find earth current phase phase
Anti- two neighboring measuring point, the section between two measuring point is GIL fault section.
Decision logic are as follows: first the earth current phase of each measuring point is compared one by one, phase between measuring point N and measuring point N+1
Then position is on the contrary, determine to be GIL fault section from measuring point N to measuring point N+1.
As shown in attached drawing 3 and Fig. 4, disclosed herein as well is a kind of, and the GIL based on aforementioned GIL Fault Locating Method positions system
System, the GIL positioning system includes multiple in-site collecting devices, data concentrator and fault location host.
Multiple measuring points are set along the GIL that each waits for fault location, go out in-site collecting device is installed in each measuring point,
The in-site collecting device is for measuring the earth current for flowing through copper bar；The in-site collecting device shunt line and acquisition terminal,
The acquisition terminal is punching mutual inductor, and shunt line is connected in parallel on grounding copper bar, and punching mutual inductor is set on shunt line.
Each GIL route is correspondingly arranged a data concentrator, and the data concentrator is respectively adopted on the spot for receiving in this GIL route
Acquisition means earth current signal collected.It is connected by RS485 bus with power supply synchronous bus between each in-site collecting device,
Each data concentrator is connected by optical fiber.Each data concentrator will be on all earth current signals in corresponding GIL route
Fault location host is reached, GIL fault section is judged by fault location host.
The fault location host obtains the trip signal of route protection by MMS or GOOSE network.It is local mounted to adopt
Acquisition means are using the power frequency AC220V Alternating Current Power Supply on same bus, for electrical connection using connection type of handing in hand, acquisition device
AC220V alternating supply voltage is also acquired while acquiring copper bar electric current, uses supply voltage as the reference of phase measurement
Phase.
It is with being mounted on GIL online along in-site collecting device, copper bar is acquired by shunt connection and punching mutual inductor and is connect
Earth-current；Along GIL longitudinally data concentrator is set at a certain distance, connects distribution on the spot by way of " hand in hand " topology
Acquisition device；Data concentrator is connected to fault location host by fiber optic Ethernet, will transmit after the data collection of collector
In-site collecting device is broadcast to data concentrator, and by the enabling signal of fault location host；One failure of concentrated setting is fixed
Position host, collects the current amplitude and phase information of all fronts, and barrier positioning host obtains route protection by MMS or GOOSE network
Trip signal, trip signal is forwarded to whole in-site collecting devices by data concentrator.In-site collecting device can make
Use the route protection action signal of concentration as enabling signal, it is possible to use copper bar jump-value of current is as enabling signal, the two
For "or" logic.After the starting of in-site collecting device, the current sample waveform of 5 each power frequency period each before and after Startup time is stored in dress
In the eeprom chip set, do not lost under power-down conditions.After line fault, fault location host is collected completely by calling mode
Sampled data, calculate the amplitude and phase of each point electric current, for fault point positioning differentiate.Since GIL built-in electrical insulation damages
Bad irrecoverable, when positioning, need not consider that circuit re-switching bring repeatedly starts logic.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (11)
1. a kind of GIL Fault Locating Method based on earth current, SF6 gas-insulated metal closed power transmission line GIL, shell
It is fixed on the ground by support frame, provided underground grounding copper bar, GIL shell and support frame access copper bar earth mat nearby；It is special
Sign is, the localization method the following steps are included:
Step 1: one measuring point being set every set distance along GIL, is flowed through in each measuring point setting in-site collecting device for measuring
Electric current, that is, earth current the amplitude and phase of grounding copper bar at the measuring point；
Step 2: when meeting in-site collecting device enabling signal condition, then each in-site collecting device set by starting step 1,
Earth current amplitude and phase at each measuring point of in-site collecting；
Step 3: judging the ratio along the copper bar resistance of the setting length of the longitudinal direction GIL and the soil of setting length or concrete resistance
Value enters step 4, otherwise enters step 5 when the ratio is greater than preset resistance ratio threshold value；
Step 4: flowing through the earth current amplitude of copper bar according to each measuring point that step 2 acquires, find out earth current amplitude maximum
Measuring point, the section between two measuring point of left and right adjacent with the measuring point are judged as GIL fault section；
Step 5: flowing through the earth current phase of copper bar according to each measuring point that step 2 acquires, find earth current opposite in phase
Two neighboring measuring point, the section between two measuring point is GIL fault section.
2. the GIL Fault Locating Method according to claim 1 based on earth current, it is characterised in that:
In step 1, acquire the electric current on grounding copper bar using the mode of shunting, i.e., the parallel shunt branch on grounding copper bar,
The current amplitude and phase on copper bar are obtained by way of acquiring diverter branch electric current.
3. the GIL Fault Locating Method according to claim 1 based on earth current, it is characterised in that:
In step 2, in-site collecting device enabling signal includes route protection action signal and copper bar earth current Sudden Changing Rate letter
Number, route protection action signal and copper bar earth current Sudden Changing Rate signal are the logical relation of "or".
4. the GIL Fault Locating Method according to claim 3 based on earth current, it is characterised in that:
In step 2, after the starting of in-site collecting device, according to the current sample waveform of 5 power frequency periods each before and after Startup time
Calculate earth current amplitude and phase.
5. the GIL Fault Locating Method according to claim 1 based on earth current, it is characterised in that:
In step 3, the setting length refers to 10 times of default positioning accuracy L i.e. 10L length, the preset resistance ratio
Threshold value is 10%.
6. the GIL fault location system of GIL Fault Locating Method described in a kind of any one of claim 1-5 claim, institute
Stating GIL fault location system includes multiple in-site collecting devices, data concentrator and fault location host；It is characterized by:
Multiple measuring points are set along the GIL that each waits for fault location, goes out in each measuring point and in-site collecting device is installed, it is described
In-site collecting device is for measuring the earth current for flowing through copper bar；
As soon as each GIL route is correspondingly arranged a data concentrator, the data concentrator is each in this GIL route for receiving
Ground acquisition device earth current signal collected；
All earth current signals in corresponding GIL route are uploaded to fault location host by each data concentrator, by event
Barrier positioning host judges GIL fault section.
7. GIL fault location system according to claim 6, it is characterised in that:
The in-site collecting device shunt line and acquisition terminal, the acquisition terminal are punching mutual inductor, and shunt line is connected in parallel on
On grounding copper bar, punching mutual inductor is set on shunt line.
8. GIL fault location system according to claim 6, it is characterised in that:
It is connected by RS485 bus with power supply synchronous bus between each in-site collecting device.
9. GIL fault location system according to claim 6, it is characterised in that:
Each data concentrator is connected by optical fiber.
10. GIL fault location system according to claim 6, it is characterised in that:
The fault location host obtains the trip signal of route protection by MMS or GOOSE network.
11. GIL fault location system according to claim 6, it is characterised in that:
Local mounted acquisition device is connected using the power frequency AC220V Alternating Current Power Supply on same bus, for electrical connection using handing in hand
Connect mode, acquisition device also acquires AC220V alternating supply voltage while acquiring copper bar electric current, use supply voltage as
The reference phase of phase measurement.
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| CN109738763A (en) * | 2019-02-28 | 2019-05-10 | 国网湖北省电力有限公司黄石供电公司 | A kind of medium-voltage distribution cable short trouble localization method based on wavelet package transforms |
| CN109995010B (en) * | 2019-04-29 | 2021-04-20 | 南京南瑞继保电气有限公司 | Automatic control method and system for induced current quick release device |
| CN112748274B (en) * | 2019-10-31 | 2023-05-16 | 西安西电高压开关有限责任公司 | Current measuring device |
| CN111077391A (en) * | 2019-12-20 | 2020-04-28 | 中国能源建设集团江苏省电力设计院有限公司 | Real-time monitoring system for GIL (Gate in line) |
| CN111562463A (en) * | 2020-05-11 | 2020-08-21 | 云南电网有限责任公司电力科学研究院 | GIL fault positioning system and method based on optical fiber communication |
| CN113671315B (en) * | 2021-08-18 | 2023-10-27 | 北京四方继保工程技术有限公司 | ITn power supply insulation fault positioning method based on proportional differential principle |
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| JP2002328148A (en) * | 2001-04-27 | 2002-11-15 | Kyushu Inst Of Technology | Method of measuring insulation characteristic at high temperature for insulation gas |
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