CN109031034A - A kind of circuitry fault detection method and system - Google Patents
A kind of circuitry fault detection method and system Download PDFInfo
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- CN109031034A CN109031034A CN201710434350.2A CN201710434350A CN109031034A CN 109031034 A CN109031034 A CN 109031034A CN 201710434350 A CN201710434350 A CN 201710434350A CN 109031034 A CN109031034 A CN 109031034A
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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
-
- 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
- G01R31/088—Aspects of digital computing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The present invention relates to a kind of circuitry fault detection method and system, this method setting redundancy three channels to control and protection system transmission include fault condition line information；Both from corresponding route acquisition unit and fault detection means, the route acquisition unit is used to export the line information according to the electric quantity information line information in every channel for acquiring route electric quantity information, the fault detection means；When the fault condition of at least transmission of two passes is that failure is effective, control and protection system judges line failure.When breaking down the invention enables any fault detection means, fault detection means remains to work normally, and enhances stability, the reliability of fault detection means, improves the reliability of control and protection system movement.
Description
Technical field
The invention belongs to flexible DC transmission technology fields, and in particular to a kind of circuitry fault detection method and system.
Background technique
With the shortage of non-renewable energy and the continuous aggravation of environmental degradation problem, existing various countries have recognized that the utilization of the energy with
Exploitation must be from traditional energy to green renewable and clean energy resource transition.Multiterminal element based on customary DC and flexible direct current is defeated
Electric system and DC grid technology are to solve the problems, such as one of new-energy grid-connected and the effective technology means of consumption.
Since the damping of direct current system is relatively low, compared with AC system, the fault progression of direct current system faster, is controlled
The difficulty for making protection is also bigger.For flexible HVDC transmission system, once DC side breaks down, it is necessary to it is handed over using disconnecting
The method of stream side breaker carrys out disjunction fault current, therefore for quickly limitation and disengagement failure electric current is to maintain DC grid safe
The key equipment in power grid is run and protects, high voltage DC breaker becomes effective even unique technical means.
For the protection of DC line, it is urgently required to the protective device of excision fault current.High voltage direct current open circuit
Device can cut off direct fault current, and the rising of DC line fault electric current is fast compared with alternating current circuit, need when DC line fault occurs
Rapidly and accurately protect, therefore, high voltage DC breaker quick fault testing device must quickly and accurately judge, with greater need for
Judging result is timely and accurately transmitted to high voltage DC breaker control and protection system.
High voltage DC breaker adds power electronic devices to form using Fast mechanical switch, after failure generation, passes through electricity
Power electronic device is acted according to certain timing, completes electric current transfer and consumption, if fault detection means does not detect normally, high pressure
Dc circuit breaker control and protection system then can not be protected normally in failure, will lead to energy and do not shift, power train will be damaged when serious
Bulk cargo is set.Existing fault detection means may cause to transmit because itself is there are problem or redundancy offering question
Information reliability is lower.
Summary of the invention
The purpose of the present invention is to provide a kind of circuitry fault detection method and systems, to solve route in the prior art
The detection of failure judges the low problem of reliability.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
A kind of circuitry fault detection method of the invention, includes the following steps:
1) be arranged redundancy three channels to control and protection system transmission include fault condition line information；Every channel
Line information is both from corresponding route acquisition unit and fault detection means, and the route acquisition unit is for acquiring route
Electric quantity information, the fault detection means are used to export the line information according to the electric quantity information；
2) when the fault condition of at least transmission of two passes is that failure is effective, control and protection system judges that event occurs for route
Barrier.
Further, the line information includes detection information and flag information；Every channel includes two lines road, and one
Route is used for transmission the detection information, and another route is only used for transmitting the flag information, and the flag information is used for
Indicate whether route breaks down；It, should when the fault condition of any bar line transmission in the two lines road is that failure is effective
The fault condition of channel transfer is that failure is effective.
Further, the detection information includes line fault information, further includes current magnitude information, current changing rate letter
At least one of breath, current over-zero status information and sampling circuit temperature information.
Further, the flag information is the pulse signal of setpoint frequency；Biography is represented by the difference of setpoint frequency
Whether defeated fault condition is that failure is effective.
Further, if judging, the fault condition of a channel transfer is effective for failure, the meter of the effective counter of failure
Calculation value+1；Otherwise, the count value+1 of failure invalid counter；
When the count value of the effective counter of failure >=2, control and protection system movement；Otherwise control and protection system is failure to actuate；
When the count value of failure invalid counter >=2, control and protection system is failure to actuate；Otherwise judge the effective counter of failure
Count value whether >=2: if count value >=2 of the effective counter of failure, control and protection system movement, if the counting of the effective counter of failure
Value < 2, control and protection system is failure to actuate.
A kind of line fault detection system of the invention, the route acquisition unit being arranged including three redundancies and corresponding event
Hinder detection device and control and protection system；Each route acquisition unit and corresponding fault detection means communication connection；Three failures
Detection device and control and protection system communication connection；
The route acquisition unit is used for for acquiring route electric quantity information, the fault detection means according to the electricity
Tolerance information outlet line information, the line information includes fault condition；
The control and protection system according to the line information that fault detection means is transmitted for being judged: when at least two failures
When the fault condition of detection device output is that failure is effective, control and protection system judges line failure.
Further, the line information includes detection information and flag information；Each fault detection means passes through two
Route is connected with control and protection system, and a route is the high-speed line for being used for transmission the detection information, and another route is only
It is used for transmission the separate lines of the flag information；Control and protection system is for judging: when any bar route passes in the two lines road
When defeated fault condition is that failure is effective, the fault condition of the channel transfer is that failure is effective.
Further, the detection information includes line fault information, further includes current magnitude information, current changing rate letter
At least one of breath, current over-zero status information and sampling circuit temperature information.
Further, the flag information is the pulse signal of setpoint frequency；Biography is represented by the difference of setpoint frequency
Whether defeated fault condition is that failure is effective.
Further, the control and protection system is also used to judge:
If judging, the fault condition of a channel transfer is effective for failure, the calculated value+1 of the effective counter of failure；It is no
Then, the count value+1 of failure invalid counter；
When the count value of the effective counter of failure >=2, control and protection system movement；Otherwise control and protection system is failure to actuate；
When the count value of failure invalid counter >=2, control and protection system is failure to actuate；Otherwise judge the effective counter of failure
Count value whether >=2: if count value >=2 of the effective counter of failure, control and protection system movement, if the counting of the effective counter of failure
Value < 2, control and protection system is failure to actuate.
Beneficial effects of the present invention:
The present invention uses a kind of control logic of two from three, for the line information of acquisition, is arranged by three redundancies
Channel is transmitted, and when the fault condition of at least transmission of two passes is that failure is effective, judges line failure, control is protected
System acting, quickly and accurately to cut off fault current.When breaking down the invention enables any fault detection means, failure
Detection device remains to work normally, and enhances stability, the reliability of fault detection means, improves the reliable of control and protection system movement
Property.
Further, channel of the invention includes two-way route, and a route is used for transmission including line fault information
Detection information, another route, which is only used for transmission, indicates the flag information whether route breaks down, as long as a wherein route
The fault condition of transmission when being that failure is effective, the fault condition of the transmission in the channel is that failure is effective.Using two lines road come
Transmission so that wherein any one line fault when, the fault condition of the route can be transferred through another route and be transmitted, and make
Obtaining failure can timely respond to, and transmission reliability is high.
Detailed description of the invention
Fig. 1 is line fault detection system figure of the invention；
Fig. 2 is high speed optical fiber communication frame structure diagram；
Fig. 3 is individual fibers communication flow diagram；
Fig. 4 is two from three logic chart；
Fig. 5 is software flow pattern of the invention.
Specific embodiment
To keep the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, to the present invention
It is described in further detail, but embodiments of the present invention are not limited thereto.
The main function of high voltage DC breaker is exactly to cut off fault current, because of DC current no current zero crossing, high pressure
Dc circuit breaker uses electronic power switch and Fast mechanical switch hybrid combination, by controlling power electronic devices, realizes
The quick change of current transfers the energy to energy-consuming device, and then realizes electric current disjunction.
In order to guarantee that high voltage DC breaker can cut off direct fault current, when DC line fault occurs need quickly,
Accurately protect, it is proposed that a kind of line fault detection system of the invention, as shown in Figure 1.The system includes that DC line is adopted
Collect unit, high voltage DC breaker control and protection system and monitoring backstage, further include the failure device for fast detecting of three redundancies setting,
Respectively Fisrt fault device for fast detecting, the second failure device for fast detecting and third failure device for fast detecting.
Since the variation of hvdc transmission line fault current is fast, the effect of three failure device for fast detecting is exactly quick detection
Fault message is simultaneously rapidly and accurately uploaded to high voltage DC breaker control and protection system by DC Line Fault.It is quick for each failure
Detection device all includes two communication interfaces, respectively high speed optical fiber communication interface and individual fibers communication interface.Each failure
Device for fast detecting is all by the two interfaces come communication connection high voltage DC breaker control and protection system.Due to being produced in DC line
When raw failure, fault current is big, and electromagnetic interference is strong, therefore two communication interfaces are all fiber optic data communication interface here, effectively to inhibit
Electromagnetic interference guarantees that communication is stablized.
High speed optical fiber communication interface uses the high speed optical fiber communication based on FPGA, it uses communication code mode, in addition to event
Hinder other than information, will also include current amplitude, current changing rate, the route of the information such as current over-zero state and sampling circuit temperature
High speed information, comprehensively, be accurately delivered to high voltage DC breaker control and protection system.Wherein, line fault information is used to protect,
He is used for background monitoring at information.Since its transmission rate is up to 2Gbit/s, communication cycle is 20 μ s, it is thus possible to rapidly will
Transmitting fault information is to high voltage DC breaker control and protection system.The frame structure diagram of high speed optical fiber communication is as shown in Fig. 2, include frame
Head, device for fast detecting ID, line fault information, line current amplitude, line current change rate, line current zero passage, route
Side temperature, spare word, verification and postamble.
In order to increase the rapidity of transmitting fault information, individual fibers communication interface is increased.Individual fibers interface only passes
Defeated fault-signal and non-faulting signal, do not transmit remaining information.Its strong antijamming capability, communication delay are ns grades, and decoding is only
1~2 μ s is needed, line fault information quickly and accurately can be transmitted to high voltage DC breaker control and protection system.Herein, it adopts
Fault-signal and non-faulting signal are distinguished with the pulse signal of two kinds of different frequencies.For example, the arteries and veins of 1MHz/10KHz can be transmitted
Square-wave signal is rushed to realize line fault quick response, wherein the line fault that 1MHz pulse represents individual fibers communication is effective,
The line fault that 10KHz represents individual fibers communication is invalid.Using the pulse signal of 1MHz/10KHz duty ratio 50%, increase
The correctness of signal transmission.
For each failure device for fast detecting, only when the fault condition that high speed optical fiber communication interface transmits is
When the fault condition that " failure is invalid " and individual fibers communications interface transmission come is " failure is invalid ", which quickly detects dress
The fault condition for setting output is " failure is invalid ".As long as high speed optical fiber communication interface or individual fibers communications interface transmission come
Fault condition be " failure is effective ", then the failure device for fast detecting output fault condition be " failure is effective ".Meanwhile when
When either fiber exception, it can be transmitted by another optical fiber, fault-signal can timely respond to.
For the failure device for fast detecting of these three redundancies setting, the logic judging method of two from three is taken, such as Fig. 4 institute
Show, when the fault condition of at least two failure device for fast detecting output is " failure is effective ", high voltage DC breaker control is protected
System carries out protection act；Otherwise, high voltage DC breaker control and protection system is failure to actuate.So that in any failure device for fast detecting
When failure, failure device for fast detecting remains to work normally, and enhances the stability and accuracy of failure device for fast detecting, prevents
Entire fast failure device for fast detecting is caused to exit, cause high voltage DC breaker when any failure device for fast detecting failure
The case where protection exception, occurs.
Based on above system, the process of circuitry fault detection method is described in detail below, software flow pattern such as Fig. 5 institute
Show.
DC line acquisition unit acquires DC line electric quantity information, and transmits this information to Fisrt fault and quickly examine
Survey device, the second failure device for fast detecting and third failure device for fast detecting.
For each failure device for fast detecting, according to the electric quantity information that DC line acquisition unit transmits,
By high speed optical fiber communication interface by fault message, current amplitude, current changing rate, current over-zero state and sampling circuit temperature
Information is transferred to high voltage DC breaker control and protection system, and flag information is transferred to high voltage direct current open circuit by individual fibers interface
Device control and protection system.Only when the fault condition of two optical fiber interfaces transmission is all " failure is invalid ", the failure of device output
Situation is " failure is invalid ", and the count value of failure invalid counter adds 1 at this time；Otherwise the fault condition of device output is " event
Barrier is effective ", the count value of the effective counter of failure adds 1.
When the count value of the effective counter of failure is more than or equal to 2, the movement of high voltage DC breaker control and protection system；Otherwise high
Pressure dc circuit breaker control and protection system is failure to actuate；
When the count value of failure invalid counter is more than or equal to 2, high voltage DC breaker control and protection system is failure to actuate；Otherwise
Judge that high voltage DC breaker control and protection system judges whether the count value of the effective counter of failure is more than or equal to 2, if it is greater than or equal to
2, then high voltage DC breaker control and protection system acts；Otherwise high voltage DC breaker control and protection system is failure to actuate.
It is discussed in detail although the contents of the present invention have passed through above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read above content, for of the invention
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. a kind of circuitry fault detection method, which comprises the steps of:
1) be arranged redundancy three channels to control and protection system transmission include fault condition line information；The route in every channel
For information both from corresponding route acquisition unit and fault detection means, the route acquisition unit is electrical for acquiring route
Information is measured, the fault detection means is used to export the line information according to the electric quantity information；
2) when the fault condition of at least transmission of two passes is that failure is effective, control and protection system judges line failure.
2. circuitry fault detection method according to claim 1, which is characterized in that the line information includes detection information
And flag information；Every channel includes two lines road, and a route is used for transmission the detection information, and another route is only used
In transmitting the flag information, the flag information is for indicating whether route breaks down；When any in the two lines road
When the fault condition of line transmission is that failure is effective, the fault condition of the channel transfer is that failure is effective.
3. circuitry fault detection method according to claim 2, which is characterized in that the detection information includes line fault
Information further includes in current magnitude information, current changing rate information, current over-zero status information and sampling circuit temperature information
It is at least one.
4. circuitry fault detection method according to claim 2, which is characterized in that the flag information is setpoint frequency
Pulse signal；Whether the fault condition that transmission is represented by the difference of setpoint frequency is that failure is effective.
5. circuitry fault detection method according to claim 1, which is characterized in that if judging the failure of a channel transfer
Situation is that failure is effective, then the calculated value+1 of the effective counter of failure；Otherwise, the count value+1 of failure invalid counter；
When the count value of the effective counter of failure >=2, control and protection system movement；Otherwise control and protection system is failure to actuate；
When the count value of failure invalid counter >=2, control and protection system is failure to actuate；Otherwise judge the counting of the effective counter of failure
Value whether>=2: if count value>=2 of the effective counter of failure, control and protection system movement, if the count value of the effective counter of failure<
2, control and protection system is failure to actuate.
6. a kind of line fault detection system, which is characterized in that route acquisition unit including the setting of three redundancies and corresponding
Fault detection means and control and protection system；Each route acquisition unit and corresponding fault detection means communication connection；Three events
Hinder detection device and control and protection system communication connection；
The route acquisition unit is used for for acquiring route electric quantity information, the fault detection means according to the electrical quantity
Information outlet line information, the line information include fault condition；
The control and protection system according to the line information that fault detection means is transmitted for being judged: when at least two fault detections
When the fault condition of device output is that failure is effective, control and protection system judges line failure.
7. line fault detection system according to claim 6, which is characterized in that the line information includes detection information
And flag information；Each fault detection means passes through two lines road and connects with control and protection system, and a route is is used for transmission
The high-speed line of detection information is stated, another route is used only for transmitting the separate lines of the flag information；Control and protection system is used
In judging: when the fault condition of any bar line transmission in the two lines road is effective as failure, the failure of the channel transfer
Situation is that failure is effective.
8. line fault detection system according to claim 7, which is characterized in that the detection information includes line fault
Information further includes in current magnitude information, current changing rate information, current over-zero status information and sampling circuit temperature information
It is at least one.
9. line fault detection system according to claim 7, which is characterized in that the flag information is setpoint frequency
Pulse signal；Whether the fault condition that transmission is represented by the difference of setpoint frequency is that failure is effective.
10. line fault detection system according to claim 6, which is characterized in that the control and protection system is also used to judge:
If judging, the fault condition of a channel transfer is effective for failure, the calculated value+1 of the effective counter of failure；Otherwise, therefore
Hinder the count value+1 of invalid counter；
When the count value of the effective counter of failure >=2, control and protection system movement；Otherwise control and protection system is failure to actuate；
When the count value of failure invalid counter >=2, control and protection system is failure to actuate；Otherwise judge the counting of the effective counter of failure
Value whether>=2: if count value>=2 of the effective counter of failure, control and protection system movement, if the count value of the effective counter of failure<
2, control and protection system is failure to actuate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710434350.2A CN109031034A (en) | 2017-06-09 | 2017-06-09 | A kind of circuitry fault detection method and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710434350.2A CN109031034A (en) | 2017-06-09 | 2017-06-09 | A kind of circuitry fault detection method and system |
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| CN109031034A true CN109031034A (en) | 2018-12-18 |
Family
ID=64629891
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| CN201710434350.2A Pending CN109031034A (en) | 2017-06-09 | 2017-06-09 | A kind of circuitry fault detection method and system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109900955A (en) * | 2019-01-31 | 2019-06-18 | 大族激光科技产业集团股份有限公司 | Circuit monitoring system |
| CN110763938A (en) * | 2019-11-01 | 2020-02-07 | 中车大连机车研究所有限公司 | Intelligent state monitoring type traction control interface module |
| CN110940892A (en) * | 2019-12-13 | 2020-03-31 | 西安锐驰电器有限公司 | Equipment line fault detection system and method |
| CN113465039A (en) * | 2021-04-29 | 2021-10-01 | 青岛海尔空调器有限总公司 | Control method for air conditioner and air conditioner |
| CN113589023A (en) * | 2020-04-30 | 2021-11-02 | 南京南瑞继保电气有限公司 | Method and device for rapidly detecting single set of abnormal alternating current measurement of redundant system |
| CN113872164A (en) * | 2021-10-09 | 2021-12-31 | 深圳供电局有限公司 | Power distribution protection method, device, system and storage medium |
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| CN113465039A (en) * | 2021-04-29 | 2021-10-01 | 青岛海尔空调器有限总公司 | Control method for air conditioner and air conditioner |
| CN113872164A (en) * | 2021-10-09 | 2021-12-31 | 深圳供电局有限公司 | Power distribution protection method, device, system and storage medium |
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Application publication date: 20181218 |