CN109444670A - Fault location system and method for grounding electrode line in direct current transmission system - Google Patents
Fault location system and method for grounding electrode line in direct current transmission system Download PDFInfo
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- CN109444670A CN109444670A CN201811570614.8A CN201811570614A CN109444670A CN 109444670 A CN109444670 A CN 109444670A CN 201811570614 A CN201811570614 A CN 201811570614A CN 109444670 A CN109444670 A CN 109444670A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000007935 neutral effect Effects 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims abstract description 6
- 239000007924 injection Substances 0.000 claims abstract description 6
- 230000004807 localization Effects 0.000 claims description 24
- 238000001802 infusion Methods 0.000 claims description 17
- 239000003990 capacitor Substances 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 6
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 3
- 241000931526 Acer campestre Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- G01R31/085—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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Locating Faults (AREA)
Abstract
A fault location system and method for a grounding electrode line in a direct current transmission system belong to the field of power line fault monitoring. The grounding electrode circuit formed by connecting two grounding electrode leads in parallel between a neutral point and a grounding end of a direct current transformer substation is characterized in that: the near end and the far end of the grounding electrode circuit are respectively provided with a wave trap, the wave traps are connected in series in the grounding electrode circuit, the near end of the grounding electrode circuit is also provided with a coupled signal injection circuit, the coupled signal injection circuit is connected in parallel on the grounding electrode lead wire and is used for injecting an inter-harmonic signal into the grounding electrode circuit, and the near end and the far end of the two grounding electrode lead wires are respectively provided with a current sensor for detecting a current signal. By the fault location system and the fault location method for the grounding electrode line in the direct current transmission system, a fault point in the grounding electrode line can be accurately measured in a current injection mode aiming at the grounding electrode double-circuit line parallel line in the direct current transmission system.
Description
Technical field
The fault localization system and method for ground electrode circuit in a kind of DC transmission system belongs to feeder line fault monitoring
Field.
Background technique
In electric system at home and abroad, there are many HVDC transmission systems, direct current grounding pole route is high voltage direct current
The important component of transmission system.There are two the effect of earthing pole is main: in DC bipolar balance movement, providing direct current system
The voltage reference points of system；In DC bipolar off-center operation or monopole out of service because of failure, the earth of DC current is provided
Current return circuit.Earthing pole is up to tens kilometers or even kilometer up to a hundred apart from substation's distance, in different system operation conditions
Under, direct current grounding pole operating condition difference is very big.If ground fault occurs for ground electrode circuit, it will commanded to DC power transmission system
Carry out very big influence, or even threatens the operational safety of direct current substation.Therefore malfunction monitoring is carried out to direct current grounding pole route, and
Shi Faxian failure simultaneously accurately calculates fault distance, shortens trouble shoot and repair time, extremely important.
The neutral point of direct current substation is usually grounded after two leads are drawn in the distance, wire length usually 10 ~
It is longest to have 100km between 50km.When lead insulation against ground destroys, ground resistance numerical value is bigger, and traveling wave maser is punched in fault point
Reflect smaller, transmitted in the circuit that travelling wave signal is constituted between guide wire and the earth, be lost it is also bigger, it is therefore, unsuitable
Wire ground failure is measured using traveling wave method.Lead distal end is grounded, when occurring the biggish ground fault of transition resistance in the line,
Wire current and voltage vary less, it is difficult to grounding point distance is precisely calculated, therefore also should not be real using direct current signal
Existing fault localization.
Summary of the invention
The technical problem to be solved by the present invention is overcoming the deficiencies of the prior art and provide a kind of for DC transmission system
Middle earthing pole double loop parallel line accurately measures the direct current transportation of fault point in ground electrode circuit in such a way that electric current injects
The fault localization system and method for ground electrode circuit in system.
The technical solution adopted by the present invention to solve the technical problems is: ground electrode circuit event in the DC transmission system
Hinder range-measurement system, to be formed including being connected by two earthing pole leads in parallel between direct current substation neutral point and ground terminal
Ground electrode circuit, direct current substation neutral point and ground terminal be respectively ground electrode circuit proximally and distally, it is characterised in that:
It is proximally and distally respectively arranged with trap in ground electrode circuit, trap is connected in ground electrode circuit, in ground connection polar curve
The proximal end on road is additionally provided with coupled signal infusion circuit, and coupled signal infusion circuit is connected in parallel on earthing pole lead and is used for ground connection
M-Acetyl chlorophosphonazo signal is injected in polar curve road, is proximally and distally separately provided for sensed current signal in two earthing pole leads
Current sensor.
Preferably, the coupled signal infusion circuit is connected in parallel on the trap of ground electrode circuit proximal end and earthing pole draws
Between line.
Preferably, the trap includes the capacitor and inductance being connected in parallel, and is connected on and connects after capacitor and inductance in parallel
In the route of earth polar.
Preferably, the coupled signal infusion circuit includes that the coupler being connected in series and signal source, signal source connect
Ground terminal ground connection, output end are connected in parallel in ground electrode circuit after being sequentially connected in series coupler.
Preferably, the coupler includes the capacitor and inductance being connected in series.
Preferably, the current sensor uses unsaturation current sensor.
A kind of fault distance-finding method that the fault localization system using ground electrode circuit in DC transmission system is realized, it is special
Sign is: including the following steps:
Step a forms ground resistance in the fault point of ground electrode circuit, opens after ground fault occurs in ground electrode circuit
Beginning carries out the fault localization of ground electrode circuit；
Trap is proximally and distally respectively set in ground electrode circuit in step b, and in the proximal end parallel coupled of ground electrode circuit
Then current sensor is proximally and distally respectively set in two earthing pole leads in signal infusion circuit, current sensor is adopted
With unsaturation current sensor；
Step c, by coupled signal infusion circuit in the proximal end of ground electrode circuit to ground electrode circuit Injection Current signal；
Step d, the current sensor by the way that earthing pole lead both ends are arranged in measures respectively obtains two ground electrode circuit both ends
Current signal, and the obtained signal of measurement is filtered；
Step e measures fault point in the specific location of ground electrode circuit according to fault point judgment basis；
Step f, fault localization terminate.
Preferably, fault point judgment basis described in step e are as follows:
Step e-1 is located at the difference of the current signal of proximal end and two by two earthing pole leads that current sensor measures
The ratio that earthing pole lead is located at the current signal difference of distal end be proportional to fault point and proximal end distance and with distal end distance
Ratio；
Step e-2, the current signal at the earthing pole lead both ends being calculated judge fault point at a distance from proximal end or distal end
With the ratio of ground electrode circuit total distance；
Step e-3 judges the specific location of fault point in actual circuit according to the total length of ground electrode circuit.
Compared with prior art, the present invention has the beneficial effects that
By the fault localization system and method for ground electrode circuit in this DC transmission system, for being grounded in DC transmission system
Pole double loop parallel line can quickly judge the ground fault of direct current grounding pole route in such a way that electric current injects, and count
Fault distance is calculated, fault point is accurately positioned, shortens direct current grounding pole trouble shoot and repair time, reduces DC transmission system
Outage rate.
Detailed description of the invention
Fig. 1 is direct current grounding pole conspectus in DC transmission system.
Fig. 2 is the fault localization system schematic of ground electrode circuit in DC transmission system.
Fig. 3 is the fault distance-finding method flow chart of direct current grounding pole route in DC transmission system.
Specific embodiment
Fig. 1 ~ 3 are highly preferred embodiment of the present invention, and 1 ~ 3 the present invention will be further described with reference to the accompanying drawing.
Currently, typical direct current grounding pole double loop parallel line is as shown in Figure 1, direct current becomes in HVDC transmission system
The neutral point (in figure at H1) in power station is grounded (in figure in the distance by parallel two earthing pole leads (lead S1 and lead S2)
At H2), it is ground electrode circuit between the neutral point and earthing pole of direct current substation.For convenience of statement, will be leaned in ground electrode circuit
One end of nearly direct current substation neutral point is denoted as proximal end, is denoted as distal end close to one end of earthing pole.
When breaking down in ground electrode circuit, fault localization, fault localization system packet are carried out by fault localization system
It includes: being separately positioned on trap proximally and distally in ground electrode circuit, be connected in ground electrode circuit.On ground electrode circuit
It is parallel with coupled signal infusion circuit, coupled signal infusion circuit is connected in parallel between the trap and earthing pole lead of proximal end.
Current measurement single-sensor is proximally and distally respectively arranged in two earthing pole leads.
In conjunction with such as Fig. 2, capacitor C1 and inductance L1 compose in parallel the trap of proximal end, capacitor C1 and inductance L1 it is in parallel after go here and there
It is associated in the leading-out terminal of the neutral point of direct current substation.Capacitor C2 and inductance L2 composes in parallel the trap of distal end, capacitor C2 and electricity
The ground terminal of ground electrode circuit is connected on after sense L2 is in parallel.Coupled signal infusion circuit is by capacitor C3, inductance L3 and signal
Source E1 is connected in series, and the ground terminal ground connection of signal source E1, output end is connected in parallel on proximal end resistance after being sequentially connected in series inductance L3 and capacitor C3
Between wave device and ground line lead.
Current sensor is proximally and distally respectively arranged in lead S1: current sensor T1 and current sensor T3,
Proximally and distally equally be respectively arranged with current sensor in lead S2: current sensor T2 and current sensor T4 passes through
Above-mentioned current sensor respectively measures the electric current of lead S1 and the both ends lead S2.
As shown in figure 3, the fault distance-finding method realized using above-mentioned fault localization system, is included the following steps:
Step 1, start；
The fault localization for starting progress ground electrode circuit, after ground fault occurs in ground electrode circuit, in ground electrode circuit
Fault point forms ground resistance, such as the resistance Rf in Fig. 2.
Step 2, fault localization system is set in ground electrode circuit；
As shown in Fig. 2, trap is proximally and distally respectively set in ground electrode circuit, and in the parallel connection of the proximal end of ground electrode circuit
Then current sensor, current sense is proximally and distally respectively set in two earthing pole leads in coupled signal infusion circuit
Device uses unsaturation current sensor.
Step 3, m-Acetyl chlorophosphonazo signal is injected in the proximal end of direct current grounding pole route；
By coupled signal infusion circuit in the proximal end of ground electrode circuit to ground electrode circuit Injection Current signal, and pass through capacitor
The sinusoidal m-Acetyl chlorophosphonazo signal that the coupler that C3 and inductance L3 are composed in series injected frequency into ground electrode circuit is about 1KHz.
Due to being proximally and distally in series with trap, the resonance frequency and m-Acetyl chlorophosphonazo of trap respectively in ground electrode circuit
The resonance frequency of signal is identical, therefore m-Acetyl chlorophosphonazo signal will not seal in direct current substation and ground terminal, can only be present in earthing pole
In route.
Step 4, the current signal at direct current grounding pole lead both ends is measured；
Current sensor by the way that earthing pole lead both ends are arranged in measures respectively obtains the electric current at two ground electrode circuit both ends
Signal.
Step 5, the current signal at processing measurement direct current grounding pole lead both ends；
The current signal at the earthing pole lead both ends that measurement is obtained carries out High frequency filter and low frequency filtering.
Step 6, the fault distance in direct current grounding pole lead is calculated；
According to the current signal at the earthing pole lead both ends being calculated judge at a distance from fault point and proximal end (or distal end) with
The ratio of ground electrode circuit total distance.
The judgment basis of fault point are as follows: be located at proximal end (or distal end) by two earthing pole leads that current sensor measures
Current signal the difference current signal difference that is located at distal end (or proximal end) with two earthing pole leads ratio be proportional to therefore
Ratio of the barrier point with proximal end distance and with distal end distance.
Step 7, abort situation in direct current grounding pole actual track is determined；
The specific location of fault point in actual circuit is judged according to the total length of ground electrode circuit.
Step 8, terminate；
The ranging of fault point terminates.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to above embodiments institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection scope of technical solution of the present invention.
Claims (8)
1. the fault localization system of ground electrode circuit in a kind of DC transmission system, including direct current substation neutral point and ground terminal
Between by two earthing pole leads in parallel connect the ground electrode circuit to be formed, direct current substation neutral point and ground terminal point
Not Wei ground electrode circuit proximally and distally, it is characterised in that: be proximally and distally respectively arranged with wave arrestment in ground electrode circuit
Device, trap are connected in ground electrode circuit, are additionally provided with coupled signal infusion circuit, coupling letter in the proximal end of ground electrode circuit
Number infusion circuit is connected in parallel on earthing pole lead for injecting m-Acetyl chlorophosphonazo signal into ground electrode circuit, in two earthing pole leads
The current sensor for being proximally and distally separately provided for sensed current signal.
2. the fault localization system of ground electrode circuit in DC transmission system according to claim 1, it is characterised in that: institute
The coupled signal infusion circuit stated is connected in parallel between the trap and earthing pole lead of ground electrode circuit proximal end.
3. the fault localization system of ground electrode circuit in DC transmission system according to claim 1, it is characterised in that: institute
The trap stated includes the capacitor and inductance being connected in parallel, and is connected in ground electrode circuit after capacitor and inductance in parallel.
4. the fault localization system of ground electrode circuit in DC transmission system according to claim 1, it is characterised in that: institute
The coupled signal infusion circuit stated include be connected in series coupler and signal source, source ground end ground connection, output end according to
It is connected in parallel in ground electrode circuit after secondary tandem coupler.
5. the fault localization system of ground electrode circuit in DC transmission system according to claim 4, it is characterised in that: institute
The coupler stated includes the capacitor and inductance being connected in series.
6. the fault localization system of ground electrode circuit in DC transmission system according to claim 1, it is characterised in that: institute
The current sensor stated uses unsaturation current sensor.
7. being realized using the fault localization system of ground electrode circuit in the described in any item DC transmission systems of claim 1 ~ 6
Fault distance-finding method, characterized by the following steps:
Step a forms ground resistance in the fault point of ground electrode circuit, opens after ground fault occurs in ground electrode circuit
Beginning carries out the fault localization of ground electrode circuit；
Trap is proximally and distally respectively set in ground electrode circuit in step b, and in the proximal end parallel coupled of ground electrode circuit
Then current sensor is proximally and distally respectively set in two earthing pole leads in signal infusion circuit, current sensor is adopted
With unsaturation current sensor；
Step c, by coupled signal infusion circuit in the proximal end of ground electrode circuit to ground electrode circuit Injection Current signal；
Step d, the current sensor by the way that earthing pole lead both ends are arranged in measures respectively obtains two ground electrode circuit both ends
Current signal, and the obtained signal of measurement is filtered；
Step e measures fault point in the specific location of ground electrode circuit according to fault point judgment basis；
Step f, fault localization terminate.
8. fault distance-finding method according to claim 7, it is characterised in that: fault point judgment basis described in step e
Are as follows:
Step e-1 is located at the difference of the current signal of proximal end and two by two earthing pole leads that current sensor measures
The ratio that earthing pole lead is located at the current signal difference of distal end be proportional to fault point and proximal end distance and with distal end distance
Ratio；
Step e-2, the current signal at the earthing pole lead both ends being calculated judge fault point at a distance from proximal end or distal end
With the ratio of ground electrode circuit total distance；
Step e-3 judges the specific location of fault point in actual circuit according to the total length of ground electrode circuit.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110244192A (en) * | 2019-07-25 | 2019-09-17 | 淄博威特电气有限公司 | A kind of power overhead network earth fault distance measurement method |
| CN111313440A (en) * | 2020-02-11 | 2020-06-19 | 南方电网科学研究院有限责任公司 | Method and device for protecting unbalanced grounding electrode line of multi-terminal direct current transmission system |
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