CN106249108B - A kind of Fault Locating Method and positioning device of the AC in the DC system - Google Patents
A kind of Fault Locating Method and positioning device of the AC in the DC system Download PDFInfo
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- CN106249108B CN106249108B CN201610729570.3A CN201610729570A CN106249108B CN 106249108 B CN106249108 B CN 106249108B CN 201610729570 A CN201610729570 A CN 201610729570A CN 106249108 B CN106249108 B CN 106249108B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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Abstract
A kind of Fault Locating Method and device of the AC in the DC system, the electric current of the positive electrode and negative electrode of DC bus cathode voltage, cathode voltage, each branch is acquired by sensor, the fundamental frequency AC compounent of extraction busbar voltage and each direct current branch Fundamental-frequency Current component respectively, alternating voltage is analyzed relatively to determine the branch for exchanging and sealing in the amplitude of alternating current and phase.The method that the application proposes solves the problems, such as that fault branch can not be accurately positioned for the AC in the DC system in Traditional DC line selection apparatus, in engineering practical value with higher.
Description
Technical field
The invention belongs to technical field of electric power automation, are related to power plant and transformer station direct current system ground fault automatic route selection
Field, the Fault Locating Method of the AC in the DC system specifically compared based on voltage and current amplitude phase and positioning
Device.
Background technique
Power plant, substation direct current system be by battery group it is in parallel with float charger supply DC load operation
System is mainly control loop, signal circuit, relay protection automatic unit, breaker division operation etc. provide it is reliable and stable
Uninterruptible power supply.Since branching networks are more, the huge and complicated DC power supply network of factors compositions such as more than connected equipment, visitor
The difficulty for searching DC ground fault is increased in sight.
The anode, cathode of direct current system are insulation over the ground under normal circumstances, when thering is any to be grounded in system, one
As in the case of have no effect on direct current system operation, but when two o'clock and two o'clock or more occur and being grounded, will result in positive and negative anodes short circuit,
Switch and protective loop malfunction, misaction.
Power plant, transformer station secondary system are made of direct current system and AC system, and two systems of normal operation do not connect mutually
Logical, (alternating current-direct current circuit common cable, rainwater intrusion, alternating current-direct current cable failure, is missed terminal block humidity condensation due to various reasons
Touch, the reasons such as mis-wired) when causing the AC in the DC, the influence to ac circuit is generally confined in the ac circuit, but
But the direct current system and DC loop for injuring whole station cause protection exit intermediate relay malfunction tripping or initiation direct current molten
Silk fusing causes whole station relay fail accident.
And traditional D.C. isolation monitoring device is hardly noticeable that the failure of the AC in the DC system, and therefore, research
The fault locator of the AC in the DC system compared based on voltage and current amplitude phase is highly important.
Summary of the invention
It is an object of the invention to study DC system earth fault and the AC in the DC system, one kind is proposed
The Fault Locating Method and positioning device of the AC in the DC system.
The application specifically uses following technical scheme:
A kind of Fault Locating Method of the AC in the DC system, it is characterised in that:
It is carried out by the amplitude and phase of the alternating current in the alternating current voltage component and each direct current branch in busbar voltage
Analysis relatively determines the branch that exchange seals in.
A kind of Fault Locating Method of the AC in the DC system, which is characterized in that the described method comprises the following steps:
Step 1: sensor is installed on DC bus and each direct current branch；
Step 2: DC bus cathode voltage being acquired by sensor, cathode voltage real value phase adduction extracts fundamental frequency and hands over
Flow component, that is, alternating voltage, the electric current real value phase adduction for acquiring the positive electrode and negative electrode of each branch extract fundamental frequency AC compounent
That is alternating current；
Step 3: amplitude and phase to the alternating current in the alternating voltage and each direct current branch in DC bus carry out
Analysis is compared, to judge to exchange the branch sealed in.
In step 3, in all direct current branch, the amplitude maximum of alternating current, and AC current phase lags direct current
90 ° of alternating voltage of direct current branch in bus is judged to exchanging the fault branch sealed in.
Disclosed herein as well is a kind of fault locators of the AC in the DC system, including multiple sensors, control
Device, it is characterised in that:
The sensor is installed on DC bus and each direct current branch, by DC bus cathode voltage, the cathode of acquisition
The electric current real value of voltage real value and the positive electrode and negative electrode of each branch is by cable transmission to controller；
The controller includes voltage computing module, current calculation module, breakdown judge module, failure output module；
Wherein, the DC bus-bar voltage real value of the voltage computing module receiving sensor acquisition, counts voltage
Fundamental frequency AC compounent i.e. alternating voltage is calculated and extracted, and the fundamental frequency AC compounent calculated value in DC bus is transmitted to failure
Judgment module；
Each direct current branch electric current real value of the current calculation module receiving sensor acquisition, to each direct current branch electric current
Calculated and extracted the fundamental frequency AC compounent i.e. alternating current of each direct current branch electric current, and by the exchange in each direct current branch
Electric current calculated value is transmitted to breakdown judge module；
The breakdown judge module is by comparing the alternating voltage in DC bus and the alternating current in each direct current branch
Amplitude phase relationship, to judge the branch that seals in of exchange, wherein the amplitude maximum of alternating current, and direction lag direct current is female
90 ° of alternating voltage of direct current branch is judged to exchanging the fault branch sealed in line；
The result that the failure output module judges breakdown judge module will by serial ports, hard contact or display screen mode
Fault message output.
The advantages of the application, is: holding very much by comparing the amplitude and phase of alternating voltage and the alternating current of each branch
Easily determine the branch that exchange seals in.The fault location of this AC in the DC system compared based on voltage and current amplitude phase
Method and apparatus solve the problems, such as that Traditional DC line selection apparatus can not select fault branch for the AC in the DC system,
Practical value with higher in engineering.
Detailed description of the invention
Fig. 1 is the flow direction that alternating current 220V seals in alternating current after direct current system；
Fig. 2 is that each direct current branch alternating current amplitude phase compares；
Fig. 3 is each direct current branch alternating current compared with bus alternating voltage phase；
Fig. 4 is the Fault Locating Method flow chart of the AC in the DC system disclosed in the present application；
Fig. 5 is the fault locator structural block diagram of the AC in the DC system disclosed in the present application.
Specific embodiment
The content of invention is described further below with reference to attached drawing and example.If Fig. 1 is that alternating current 220V seals in directly
Alternating current flow graph after streaming system, alternating current 220V voltage seals in direct current system from the cathode of R21 direct current branch, due to positive and negative
The presence of pole distribution capacity, alternating current forms access by distribution capacity in direct current system.Direct current is sealed in for alternating current 220V
The R21 direct current branch of system, alternating current direction is the negative electrode bus that direct current system is flowed to by sealing in a route, through direct current system
The positive electrode bus of system flows to route；And for other normal DC branches, alternating current direction is all by direct current system
Negative electrode bus flows to route, and via line flows to the positive electrode bus of direct current system.
If Fig. 2 is that each direct current branch alternating current amplitude phase compares, as seen from the figure: direct current is sealed in for alternating current 220V
The R21 direct current branch of system, alternating current △ I21 amplitude maximum, and the direct current branch alternating current in direction and other non-faulting
It is contrary；And it is smaller for alternating current △ I11~△ In1 amplitude of non-faulting direct current branch, direction all with exchange
The R21 direct current branch that 220V seals in direct current system is contrary.
If Fig. 3 is the phase bit comparison of alternating current and bus alternating voltage in each direct current branch, as seen from the figure: for handing over
Stream 220V seals in the R21 direct current branch of direct current system, and 90 ° of AC current phase lagging voltage；And for non-faulting direct current branch
90 ° of AC current phase leading voltage.
According to the above analysis to Fig. 1-Fig. 3, the application is directed to the alternating voltage electric current width after the AC in the DC system
It is worth phase change, therefrom finds certain rule, the branch sealed in for judging exchange.Due to the positive electrode and negative electrode of direct current system
There is distribution capacity over the ground, AC signal can form access in distribution capacity.For sealing in the fault branch of exchange, exchange
The amplitude maximum of electric current, and direction lags 90 ° of alternating voltage；And for non-faulting branch, the amplitude of alternating current is smaller, and
90 ° of the advanced alternating voltage in direction.Thus can by comparing the alternating current of alternating voltage and each branch amplitude and
Phase determines branch that exchange seals in.The amplitude maximum of alternating current, and the branch of 90 ° of alternating voltage of direction lag must be
Exchange the branch sealed in.
It is as shown in Fig. 4 a kind of Fault Locating Method process signal of the AC in the DC system disclosed in the present application
Figure, the described method comprises the following steps:
Step 1: sensor is installed on DC bus and each direct current branch；
Step 2: DC bus cathode voltage being acquired by sensor, cathode voltage real value phase adduction extracts fundamental frequency and hands over
Flow component, that is, alternating voltage, the electric current real value phase adduction for acquiring the positive electrode and negative electrode of each branch extract fundamental frequency AC compounent
That is alternating current；
Step 3: amplitude and phase to alternating voltage and alternating current carry out analysis comparison, to judge to exchange the branch sealed in
Road, wherein the amplitude maximum of alternating current, and the branch of 90 ° of alternating voltage of direction lag is judged to exchanging the failure branch sealed in
Road.
Fig. 5 is the fault location of the AC in the DC system disclosed in the present application compared based on voltage and current amplitude phase
Device principle block diagram.Fault locator includes multiple sensors, controller, it is characterised in that:
The sensor is installed on DC bus and each direct current branch, by DC bus cathode voltage, the cathode of acquisition
The electric current real value of voltage real value and the positive electrode and negative electrode of each branch is by cable transmission to controller；
The controller includes: voltage computing module, current calculation module, breakdown judge module, failure output module；
The DC bus-bar voltage real value of the voltage computing module receiving sensor acquisition, calculates voltage and is mentioned
Take out fundamental frequency AC compounent, that is, alternating voltage；
The direct current branch electric current real value of the current calculation module receiving sensor acquisition, calculates electric current and is mentioned
Take out fundamental frequency AC compounent, that is, alternating current；
The breakdown judge module is gone here and there by comparing the amplitude phase relationship of alternating voltage and alternating current to judge to exchange
The branch entered, wherein the amplitude maximum of alternating current, and the branch of 90 ° of alternating voltage of direction lag is determined as that exchange seals in
Fault branch；
The result that the failure output module determines breakdown judge module passes through the modes such as serial ports, hard contact, display screen
Fault message is exported.
1~sensor of sensor n is installed on the bus and each branch of direct current system, by the alternating voltage of acquisition and exchange
Electric current △ I11~△ In1 is by wire transmission to controller.Controller utilizes " being based on voltage and current amplitude phase comparative approach "
Comprehensive descision is carried out, the direct current branch of the AC in the DC system is selected.This friendship compared based on voltage and current amplitude phase
The fault locator that stream seals in direct current system solves Traditional DC line selection apparatus and the AC in the DC system can not be selected
Be out of order branch the problem of, practical value with higher in engineering.
Applicant combines Figure of description to be described in detail and describe the technical solution of the application, but this field
It is to be understood by the skilled artisans that above embodiments are only the preferred embodiment of the application, explanation is intended merely to help to read in detail
Person more fully understands present invention spirit, and is not the limitation to the application protection scope, on the contrary, any be based on the application
Spirit made by it is any improvement or modification should all fall within the scope of protection of this application.
Claims (2)
1. a kind of Fault Locating Method of the AC in the DC system, which is characterized in that the described method comprises the following steps:
Step 1: sensor is installed on DC bus and each direct current branch；
Step 2: DC bus cathode voltage being acquired by sensor, cathode voltage real value phase adduction extracts fundamental frequency exchange point
Amount is alternating voltage, and the electric current real value phase adduction for acquiring the positive electrode and negative electrode of each branch extracts fundamental frequency AC compounent and hands over
Galvanic electricity stream；
Step 3: the amplitude and phase of the alternating current in the alternating voltage and each direct current branch in DC bus are analyzed
Compare, to judge to exchange the branch sealed in；In all direct current branch, the amplitude maximum of alternating current, and AC current phase
90 ° of alternating voltage of direct current branch in lag DC bus is judged to exchanging the fault branch sealed in.
2. a kind of fault locator of the AC in the DC system, including multiple sensors, controller, it is characterised in that:
The sensor is installed on DC bus and each direct current branch, by DC bus cathode voltage, the cathode voltage of acquisition
The electric current real value of real value and the positive electrode and negative electrode of each branch is by cable transmission to controller；
The controller includes voltage computing module, current calculation module, breakdown judge module, failure output module；
Wherein, the DC bus-bar voltage real value of the voltage computing module receiving sensor acquisition, calculates simultaneously voltage
Fundamental frequency AC compounent i.e. alternating voltage is extracted, and the fundamental frequency AC compounent calculated value in DC bus is transmitted to breakdown judge
Module；
Each direct current branch electric current real value of the current calculation module receiving sensor acquisition, carries out each direct current branch electric current
Calculate and extract the fundamental frequency AC compounent i.e. alternating current of each direct current branch electric current, and by the alternating current in each direct current branch
Calculated value is transmitted to breakdown judge module；
The breakdown judge module is by comparing the alternating voltage in DC bus and the width of the alternating current in each direct current branch
It is worth phase relation, to judge to exchange the branch sealed in, wherein the amplitude maximum of alternating current, and in the lag DC bus of direction
The direct current branch that 90 ° of alternating voltage is judged to exchanging the fault branch sealed in；
The result that the failure output module judges breakdown judge module is by serial ports, hard contact or display screen mode by failure
Information output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610729570.3A CN106249108B (en) | 2016-08-26 | 2016-08-26 | A kind of Fault Locating Method and positioning device of the AC in the DC system |
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| CN201610729570.3A CN106249108B (en) | 2016-08-26 | 2016-08-26 | A kind of Fault Locating Method and positioning device of the AC in the DC system |
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| CN106249108B true CN106249108B (en) | 2019-01-22 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109787212B (en) * | 2019-01-01 | 2022-04-26 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Method for automatically restarting ship direct current networking system in case of power failure |
| CN110794259B (en) * | 2019-10-31 | 2021-11-19 | 南方电网科学研究院有限责任公司 | Alternating current-direct current line-touching fault line selection method and device and computer readable storage medium |
| CN111487504B (en) * | 2020-04-29 | 2022-05-13 | 南京国臣直流配电科技有限公司 | Rapid protection method for alternating current fleeing into direct current fault of direct current system |
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Effective date of registration: 20161230 Address after: 100085 Middle East Road, Beijing, No. six, Central District, Haidian District Applicant after: BEIJING DANHUA HAOBO POWER SCIENCE AND TECHNOLOGY CO.,LTD. Address before: 110000 Ningbo Road, Heping District, Liaoning, No. 18, No. Applicant before: STATE GRID LIAONING ELECTRIC POWER SUPPLY Co.,Ltd. Applicant before: YANBIAN POWER SUPPLY COMPANY OF STATE GRID JILINSHENG ELECTRIC POWER SUPPLY CO. Applicant before: BEIJING DANHUA HAOBO POWER SCIENCE AND TECHNOLOGY CO.,LTD. |
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