CN100416959C - Traveling wave protective data acquisition plan considering asynchronous switching of 3-phase breaker - Google Patents
Traveling wave protective data acquisition plan considering asynchronous switching of 3-phase breaker Download PDFInfo
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- CN100416959C CN100416959C CNB2004100795109A CN200410079510A CN100416959C CN 100416959 C CN100416959 C CN 100416959C CN B2004100795109 A CNB2004100795109 A CN B2004100795109A CN 200410079510 A CN200410079510 A CN 200410079510A CN 100416959 C CN100416959 C CN 100416959C
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Abstract
The present invention relates to a collection scheme for the protection data of a traveling wave with the consideration on asynchronous switching of a 3-phase breaker, which belongs to the technical field of power system relay protection. In the scheme, variable length for sampling traveling wave data can be increased automatically according to the generated traveling wave. Each phase is provided with an independent traveling wave testing module which outputs a triggering pulse when testing the traveling wave. Pulses output by the phases control the data collection of the traveling wave through an or gate. Besides the control over the data collection, the output of the traveling wave testing module is sent to a protection algorithm. When receiving a single trigger pulse, the protection algorithm judges once after 3 to 5 ms data of the traveling wave is collected in order to judge whether a fault exists on a protected component. The traveling wave detection of software is extended to form protection for a traditional power frequency quantity and realize the organic bond of traveling-wave protection and protection on the traditional power frequency quantity. The present invention has the advantages that the present invention can use a complex starting algorithm, can enhance the reliability of traveling wave detection, and can set setting value by software, site adjustment and maintenance are convenient, etc.
Description
Technical field:
The present invention relates to a kind of not traveling-wave protection data acquisition of asynchronous switch-on of three-phase breaker of considering, belong to the relay protection of power system technical field.
Background technology:
In the system of 220kV and above electric pressure, (it is single-phase that single-phase fault is jumped single-phase coincidence generally to be provided with composite auto-reclosing, other fault is jumped three three-phases that coincide), the mechanical structure of three-phase breaker is mutually independent, therefore to certainly exist the regular hour poor for the three-phase breaker contact closure when three-phase closed a floodgate, and the electric power system rules requirement three-phase breaker contact closure time difference can not surpass 10ms.Steady-state quantity (power frequency amount or two, three, quintuple harmonics etc.) after the traditional protection reflection fault; amplitude and the phase place of accurately measuring steady-state quantity generally need 20ms or more time; window was shorter when therefore 10ms was for the required data of traditional protection; and protection also will be done certain delay, thus three-phase breaker not asynchronous switch-on to traditional power frequency amount protection influence little (only just may not cause protecting misoperation the same period when closing time difference is big) at three-phase.The traveling-wave protection principle needs very high sample rate (more than the 500kHz); existing computer technology can't be done real-time processing to lot of data like this; therefore in existing travelling wave ranging device and traveling-wave protection principle; start all and realize by pure hardware; be to provide a trigger impulse after hardware circuit detects the capable ripple of certain intensity, certain hour (3～5ms) Temporal Data (list of references 1-4) before and after travelling wave ranging device or the protection record trigger impulse.The time difference 10ms of three-phase breaker closure seems very long for the Temporal Data length of being preserved, this capable wavestrip of closing a floodgate generation for record has been come very big difficulty.For convenience of explanation; here establish the Temporal Data that traveling-wave protection can be write down 3ms behind the trigger impulse; the order that three-phase closes a floodgate is that A closes earlier mutually; B takes second place mutually; C closes mutually at last; as B phase tape jam and A, when B phase contact of breaker closing time difference is 2.9ms; A phase contact of breaker closed circuit electric current is undergone mutation; traveling-wave protection should start the data of record 3ms immediately; B phase circuit breaker is closed during this period; but only write down the data of fault phase B phase 0.1ms, used the traveling-wave protection of 0.1ms data to be difficult to make judgement, this moment, the row ripple may malfunction or tripping.Therefore the application has proposed a kind of not traveling-wave protection data acquisition plan of asynchronous switch-on of three-phase breaker of considering.
List of references:
[1] Li Tao, Zhang Chengxue, Hu Zhijian. transmission line travelling wave fault location high speed Data Acquisition System. relay .2002,30 (8): 27-29,39
[2] Chen Ping, Niu Yanxiong, Xu Bingyin, etc. the development of modern traveling wave fault location system. Automation of Electric Systems .2003,27 (12): 81-85
[3] Dai Fen, Zhang Chengxue, Liu Yanhua. be used for the transient state travelling wave register system design of row ripple location. Electric Power Automation Equipment .2003,23 (2): 37-40
[4] Pang Xiaohui, Hu Xiulin, Zhang Yunyu, etc. high-speed data acquisition and memory technology research. the journal .1999 of HUST, 27 (3): 69-71,94
[5] Yang Qixun. microcomputer relaying protection basis. China Electric Power Publishing House, 1988
Summary of the invention:
The objective of the invention is to overcome the deficiency of prior art; data acquisition plan to existing traveling-wave protection principle improves; a kind of that capable ripple is detected is more reliable thereby provide, and the consideration three-phase breaker that can realize traveling-wave protection and traditional power frequency amount protection combination is the traveling-wave protection collecting method of asynchronous switch-on not.
Through studies show that in a large number, theoretical foundation of the present invention is:
1, the three-phase breaker combined floodgate is asynchronous in the reality, and the time difference that three-phase closes a floodgate also is at random, and the each image data length of existing capable ripple acquisition scheme is fixed length, when use this acquisition scheme record three-phase not asynchronous switch-on produce capable ripple the time, might leak the capable ripple of adopting certain generation of closing a floodgate mutually.Therefore, the capable wave datum sampling length in this programme is elongated, can increase automatically according to the capable ripple that produces that closes a floodgate, and can intactly write down the not capable ripple of asynchronous switch-on.
2, the capable wave detecting method of existing hardware often uses differential circuit to detect the row ripple, is subjected to interference effect bigger, and reliability is not high, and setting value is also by hardware setting, field adjustable, adjust loaded down with trivial details.Existing traveling-wave protection is that the capable ripple that utilizes fault to cause is accomplished the ultrahigh speed action; but when the fault point voltage zero cross near fault; the row ripple is faint, and the traveling-wave protection principle can not be suitable for, and this moment can be by means of protection (as the protection of power frequency amount principle) the excision fault of other principle.In the electric power system for safety, reliable for the purpose of, except main protection, all be provided with backup protection, traveling-wave protection is no exception, also backup protection should be arranged.
Overall plan of the present invention as shown in Figure 1.In Fig. 1, the every setting mutually independently gone the ripple detection module, exports a trigger impulse when detecting capable ripple, each mutually output pulse by or the data acquisition of gate control row ripple.The output of row ripple detection module is also sent into the protection algorithm except the control data collection.Receive trigger impulse one time when the protection algorithm, collect enough in wait (relevant with the traveling-wave protection algorithm, be generally 3～5ms) capable wave datum and once judge afterwards, judge whether protected element has the fault existence.。
The flow chart that capable wave datum of the present invention is gathered as shown in Figure 2.In Fig. 2, t
CurThe expression current time, it is absolute time not necessarily, also can be relative time.Because the row ripple had arrived the protection installation place when row ripple detection module detected capable ripple; and some traveling-wave protection algorithm needs the preceding data of fault; therefore need to distribute earlier certain buffering area (initial address of initialization and end address) when not having fault, ceaselessly to carry out the loop-around data collection, a certain amount of image data before triggering with assurance.When receiving trigger impulse during the loop-around data collection, then interrupt cycles and is noted and is triggered time corresponding (t according to collection immediately
Trig), and carry out the collection of Temporal Data after the fault immediately; If current time (t
Cur) with trigger corresponding time (t
Trig) difference reach a set time length (T
Len), then stop the Temporal Data collection, after redistributing buffering area, enter the loop-around data acquisition state; If when during the Temporal Data collection, receiving trigger impulse again, then reset and trigger time corresponding (t
Trig), to guarantee the increasing Temporal Data acquisition time automatically, complete documentation transient state travelling wave data.Above traveling-wave protection data acquisition plan has been realized the data acquisition of elongated degree, can adapt to the not asynchronous switch-on of three-phase breaker in the electric power system.
The software function of ripple detection module of will going this programme is expanded, and constitutes the traditional protection based on the power frequency amount, as the backup protection of traveling-wave protection, can realize the combination that traveling-wave protection and traditional power frequency amount are protected.
The solution of the present invention has can use complicated starting algorithm, improves the reliability that the row ripple detects, and setting value is by software set, and field adjustable and easy to maintenance can be realized the advantages such as combination that traveling-wave protection and traditional power frequency amount are protected.
Description of drawings:
Fig. 1 data acquisition overall plan
The capable wave datum collecting flowchart of Fig. 2 figure
The capable ripple detection module of Fig. 3
Embodiment:
Traveling-wave protection collecting method of the present invention is as follows:
Capable wave datum acquisition module among overall plan Fig. 1, because the sample rate very high (hundreds of kHz～number MHz) of row ripple, use CPU or DSP control A/D conversion to need the time longer with storage, often can not satisfy and can not give full play to calculating and the logic judging function of CPU or DSP, therefore capable ripple collection is at a high speed generally realized by CPLD (ComplexProgrammable Logic Device) hardware circuit.
Capable ripple detection module among overall plan Fig. 1 adopts the capable wave detecting method of software as shown in Figure 3 to realize.In Fig. 3, the A/D conversion does not need to resemble the high sample rate of record row Poona's sample, and only needs the sample rate of several kHz to get final product, and the sudden change amount detects the sudden change quantity measuring method (list of references 5) that can use the classics shown in (1) formula.Can also add other starting algorithm as required, make that row ripple detection module is more flexible.
Δi
k|i
k-i
k-N|-|i
k-N-i
k-2N| (1)
(1) in the formula, Δ i
kThe expression jump-value of current, i
kThe sampled value that the expression electric current is carved k at a time, N represents the sampling number in the power frequency period (20ms).When detecting the trip ripple and arrive, not directly pulse of output, but through one 0 time action, T
1The relay output that time is returned, do like this can overcome capable ripple repeatedly roll over, reflect the situation of protecting too much frequent starting that causes.
The flow chart of capable wave datum collection of the present invention is undertaken by flow process shown in Figure 2.In Fig. 2, t
CurThe expression current time, it is absolute time not necessarily, also can be relative time.Because the row ripple had arrived the protection installation place when row ripple detection module detected capable ripple; and some traveling-wave protection algorithm needs the preceding data of fault; therefore need to distribute earlier certain buffering area (initial address of initialization and end address) when not having fault, ceaselessly carry out the loop-around data collection, to guarantee the image data before a certain amount of triggering.When receiving trigger impulse during the loop-around data collection, then interrupt cycles and is noted and is triggered time corresponding (t according to collection immediately
Trig), and carry out the collection of Temporal Data after the fault immediately; If current time (t
Cur) with trigger corresponding time (t
Trig) difference reach a set time length (T
Len), then stop the Temporal Data collection, after redistributing buffering area, enter the loop-around data acquisition state; If when during the Temporal Data collection, receiving trigger impulse again, then reset and trigger time corresponding (t
Trig), to guarantee the increasing Temporal Data acquisition time automatically, complete documentation transient state travelling wave data.T
LenSize is relevant with the protection algorithm, is generally 3～5ms.
This programme is by means of protection (as the protection of power frequency amount principle) the excision fault of other principle.The software function of row ripple detection module is expanded, constituted traditional protection,, can be realized the combination of traveling-wave protection and traditional power frequency amount protection as the backup protection of traveling-wave protection based on the power frequency amount.
Claims (1)
1. consider the not traveling-wave protection collecting method of asynchronous switch-on of three-phase breaker for one kind, it is characterized in that: when receiving trigger impulse during the loop-around data collection, then interrupt cycles is according to collection, and notes and trigger time corresponding (t
Trig), and carry out the collection of Temporal Data after the fault; If current time (t
Cur) with trigger corresponding time (t
Trig) difference reach a set time length (T
Len), then stop the Temporal Data collection, after redistributing buffering area, enter the loop-around data acquisition state; If when during the Temporal Data collection, receiving trigger impulse again, then reset and trigger time corresponding (t
Trig), to guarantee the increasing Temporal Data acquisition time automatically, complete documentation transient state travelling wave data.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101825672B (en) * | 2010-05-13 | 2011-12-28 | 四川电力试验研究院 | Phase selection switching-in tester with breaker pre-breakdown model |
| CN109270380B (en) * | 2018-10-17 | 2023-11-10 | 中铁第四勘察设计院集团有限公司 | Travelling wave measuring circuit of traction power supply system |
| CN111142015B (en) * | 2018-11-06 | 2022-12-06 | 西门子股份公司 | Monitoring method and monitoring circuit for state of contact of switch device |
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| CN1270316A (en) * | 2000-06-09 | 2000-10-18 | 清华大学 | High-speed synchronous data acquiring and digital signal processing board |
| CN1356752A (en) * | 2001-12-28 | 2002-07-03 | 清华大学 | Digital travelling wave protection method for power transmission line and its relay and protection system |
| CN1367392A (en) * | 2001-12-28 | 2002-09-04 | 清华大学 | High-accuracy failure wave-recording device and its transmission line combined failure distance-measuring method |
| CN1529176A (en) * | 2003-09-30 | 2004-09-15 | 昆明理工大学 | Method for detecting travelling-wave protection device |
| CN1529180A (en) * | 2003-10-10 | 2004-09-15 | 武汉大学 | High-volage transmitting-line multiple-path high-precision GPS single-end fault positioning method and apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1270316A (en) * | 2000-06-09 | 2000-10-18 | 清华大学 | High-speed synchronous data acquiring and digital signal processing board |
| CN1356752A (en) * | 2001-12-28 | 2002-07-03 | 清华大学 | Digital travelling wave protection method for power transmission line and its relay and protection system |
| CN1367392A (en) * | 2001-12-28 | 2002-09-04 | 清华大学 | High-accuracy failure wave-recording device and its transmission line combined failure distance-measuring method |
| CN1529176A (en) * | 2003-09-30 | 2004-09-15 | 昆明理工大学 | Method for detecting travelling-wave protection device |
| CN1529180A (en) * | 2003-10-10 | 2004-09-15 | 武汉大学 | High-volage transmitting-line multiple-path high-precision GPS single-end fault positioning method and apparatus |
Non-Patent Citations (2)
| Title |
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| 一种基于行波测距的输电线接地故障距离保护方案. 司大军，束洪春，陈学允.电工技术学报，第18卷第4期. 2003 |
| 一种基于行波测距的输电线接地故障距离保护方案. 司大军，束洪春，陈学允.电工技术学报，第18卷第4期. 2003 * |
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