CN105629127A - EHV line protection method with integration with traveling wave ranging function - Google Patents
EHV line protection method with integration with traveling wave ranging function Download PDFInfo
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- CN105629127A CN105629127A CN201510976920.1A CN201510976920A CN105629127A CN 105629127 A CN105629127 A CN 105629127A CN 201510976920 A CN201510976920 A CN 201510976920A CN 105629127 A CN105629127 A CN 105629127A
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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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Abstract
The present invention discloses an EHV line protection method with the integration with a traveling wave ranging function. The method is characterized in that a traveling wave CPU is added to an existing EHV line protection device, a current transformer is used to measure current traveling wave, and a traveling wave CPU is used to collect failed traveling wave data to carrying out traveling wave ranging. The traveling wave CPU comprises a traveling wave MCU, and a high speed data collection circuit. The traveling wave CPU is connected to the high speed data collection circuit. The high speed data collection circuit is used for recording the failed traveling wave data. The traveling wave CPU is used for analyzing and processing the failed traveling wave data from the high speed data collection circuit. According to the method, the functions of traveling wave ranging and line protection are fused in one body and are integrated into the EHV line protection device, substation resource allocation is greatly optimized, and the economic efficiency of substation investment is improved.
Description
Technical field
The present invention relates to the supertension line guard method of a kind of integrated travelling wave ranging function, belong to power system automation technology field.
Background technology
The fault localization of current most of transformer station is also to rely on the range finder module of line protective devices self, but by the impact of many factors, route protection is caused that range accuracy error is big based on the range measurement principle of steady-state quantity, and adaptability is poor, travelling wave ranging then can be accurately positioned line fault point, greatly reduce the workload of line walking, shorten fault correction time, improve power supply reliability, come into engineer applied at present, but in current transformer substation except layout line line protection device, also need a set of traveling wave ranging device of additional configuration, line protective devices complete defencive function, traveling wave ranging device completes the function of fault localization, both are separate.
Independent configuration line Wave ranging device wastes the resource of transformer station; traveling wave ranging device is owing to being subject to the restriction of own resource simultaneously; generally several circuits can only be carried out travelling wave ranging simultaneously; if and travelling wave ranging module is integrated in existing line protective devices; above problem is just readily solved, and every circuit can realize being accurately positioned of fault without configuring extra traveling wave ranging device.
Existing supervoltage line protective device based on integrated planning, interface definition, modularized design thinking; take the technology path according to the system integration and system optimization; its motherboard be respectively arranged with power insert, output plate, signal plate, open into plate, monitor board, protection CPU, exchange plug-in unit, light every etc. plug-in unit.
Summary of the invention
It is an object of the invention to solve existing transformer station and depend on the range finder module that line protective devices carry, this range accuracy is poor, and the suitability is not strong, it is proposed to the supertension line guard method of a kind of integrated travelling wave ranging function.
The present invention adopts the following technical scheme that the supertension line guard method of a kind of integrated travelling wave ranging function, it is characterized in that, existing supervoltage line protective device increases by one piece of traveling wave CPU, utilize current transformer to measure current traveling wave, utilize traveling wave CPU to carry out travelling wave ranging to gather fault traveling wave data; Described traveling wave CPU is connected and interactive information by the bus arranged on motherboard with the protection CPU on supervoltage line protective device; described traveling wave CPU includes traveling wave MCU, high-speed data acquisition loop; described traveling wave MCU is connected with described high-speed data acquisition loop; described high-speed data acquisition loop is used for record trouble traveling wave data, and described traveling wave MCU is used for the fault traveling wave data analyzed and processed from described high-speed data acquisition loop.
Preferably, the sample frequency of described traveling wave CPU is 2MHz.
Preferably, described travelling wave ranging adopts both-end distance measuring algorithm, including: being rushed to, with first initial row wave, the time difference reaching two ends and find range, concrete range finding formula is:
In above formula, L is line length, v1For line mould velocity of wave, tM,tNThe absolute time at two ends, D is arrived for traveling waveMFFor the trouble point distance from protection installation place, M side; Needing the correct time that the initial traveling wave of fault inspecting arrives two-sided measurement end can complete fault location, the traveling wave CPU of both sides adopts the optical-fibre channel of configuration on supervoltage line protective device to complete sharing of both sides travelling wave ranging data.
Preferably, described travelling wave ranging specifically includes following steps:
After breaking down on step SS1 circuit, this side starts with the traveling wave CPU of offside, protection CPU, and traveling wave CPU starts the negative supply of open exit relay;
The traveling wave CPU of this side supervoltage line protective device of step SS2 calculates the time t that initial traveling wave arrivesM, by the bus on motherboard, this side result is sent to protection CPU, the protection CPU action of this side supervoltage line protective device;
The traveling wave CPU of step SS3 offside supervoltage line protective device calculates the time t that initial traveling wave arrivesN, and complete the mutual of both sides traveling wave time of advent by optical-fibre channel, offside result is sent to the traveling wave CPU of this side supervoltage line protective device;
The traveling wave CPU of this side supervoltage line protective device of step SS4 receives the t that offside calculatesN, complete fault travelling wave ranging algorithm and export the man-machine module monitor board to this side supervoltage line protective device.
The beneficial effect that the present invention reaches: travelling wave ranging and route protection function are combined together by (1) present invention, are integrated in high-voltage line protection device, is greatly optimized transformer station's resource distribution, improves the economic benefit of investment of substations; (2) the power frequency location algorithm solving existing dependence existing line protection device is caused, by the impact of factors, the difficulty that range accuracy error is bigger, and Algorithms of Travelling Wave Based Fault Location can be suitably used for the various fault types under various operating mode, range accuracy height; (3) route protection being integrated with travelling wave ranging then can be accurately positioned line fault point, reduces the workload of line walking, shortens fault correction time, improves power supply reliability.
Accompanying drawing explanation
Fig. 1 is the motherboard layout drawing of the supervoltage line protective device being integrated with travelling wave ranging.
Fig. 2 is the hardware module schematic diagram of the supervoltage line protective device being integrated with travelling wave ranging.
Fig. 3 is the mutual schematic diagram of protection CPU and the traveling wave CPU of the present invention.
Fig. 4 is the travelling wave ranging schematic flow sheet of the supertension line guard method of a kind of integrated travelling wave ranging function of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described. Following example are only for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
Fig. 1 is the motherboard layout drawing of the supervoltage line protective device being integrated with travelling wave ranging, the present invention proposes the supertension line guard method of a kind of integrated travelling wave ranging function, it is characterized in that, existing supervoltage line protective device increases by one piece of traveling wave CPU, utilize current transformer to measure current traveling wave, utilize traveling wave CPU to carry out travelling wave ranging to gather fault traveling wave data; Described traveling wave CPU is connected and interactive information by the bus arranged on motherboard with the protection CPU on supervoltage line protective device; described traveling wave CPU includes traveling wave MCU, high-speed data acquisition loop; described traveling wave MCU is connected with described high-speed data acquisition loop; described high-speed data acquisition loop is used for record trouble traveling wave data, and described traveling wave MCU is used for the fault traveling wave data analyzed and processed from described high-speed data acquisition loop.
The sample frequency of described traveling wave CPU is that 2MHz, traveling wave CPU are stored in the data in the RAM of high-speed data acquisition loop with slower digital independent after a failure, and follow-up being analyzed processes, and solves, with this, the contradiction that sample rate is limited with CPU disposal ability. When traveling wave ranging device needs GPS pair, pair time required precision higher, mode that unified timing device in super high-speed route protection device tool standby station accesses, only need will pair time access traveling wave CPU and protect CPU.
Fig. 2 is the hardware module schematic diagram of the supervoltage line protective device being integrated with travelling wave ranging, conventional voltage transformer successively with the low-pass filter circuit of protection CPU, A/D change-over circuit, the MCU of protection CPU is connected, outside open into successively with light every, interface module, the MCU of protection CPU is connected, the MCU of protection CPU passes sequentially through interface module, light is every being connected with exit relay, conventional voltage transformer successively with the high-speed data acquisition loop of traveling wave CPU, the MCU of traveling wave CPU is connected, protection CPU, traveling wave CPU is connected with monitor board respectively through the bus on motherboard, monitor board is used for communicating, display, when GPS pair, the functions such as printing.
Fig. 3 is the mutual schematic diagram of protection CPU and the traveling wave CPU of the present invention, and described travelling wave ranging adopts both-end distance measuring algorithm, including: being rushed to, with first initial row wave, the time difference reaching two ends and find range, concrete range finding formula is:
In above formula, L is line length, v1For line mould velocity of wave, tM,tNThe absolute time at two ends, D is arrived for traveling waveMFFor the trouble point distance from protection installation place, M side; Needing the correct time that the initial traveling wave of fault inspecting arrives two-sided measurement end can complete fault location, the traveling wave CPU of both sides adopts the optical-fibre channel of configuration on supervoltage line protective device to complete sharing of both sides travelling wave ranging data.
Fig. 4 is the travelling wave ranging schematic flow sheet of the supertension line guard method of a kind of integrated travelling wave ranging function of the present invention, and travelling wave ranging specifically includes following steps:
After breaking down on step SS1 circuit, this side starts with the traveling wave CPU of offside, protection CPU, and traveling wave CPU starts the negative supply of open exit relay;
The traveling wave CPU of this side supervoltage line protective device of step SS2 calculates the time t that initial traveling wave arrivesM, by the bus on motherboard, this side result is sent to protection CPU, the protection CPU action of this side supervoltage line protective device;
The traveling wave CPU of step SS3 offside supervoltage line protective device calculates the time t that initial traveling wave arrivesN, and complete the mutual of both sides traveling wave time of advent by optical-fibre channel, offside result is sent to the traveling wave CPU of this side supervoltage line protective device;
The traveling wave CPU of this side supervoltage line protective device of step SS4 receives the t that offside calculatesN, complete fault travelling wave ranging algorithm and export the man-machine module monitor board to this side supervoltage line protective device.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvement and deformation, these improve and deformation also should be regarded as protection scope of the present invention.
Claims (4)
1. the supertension line guard method of an integrated travelling wave ranging function, it is characterized in that, existing supervoltage line protective device increases by one piece of traveling wave CPU, utilizes current transformer to measure current traveling wave, utilize traveling wave CPU to carry out travelling wave ranging to gather fault traveling wave data; Described traveling wave CPU is connected and interactive information by the bus arranged on motherboard with the protection CPU on supervoltage line protective device; described traveling wave CPU includes traveling wave MCU, high-speed data acquisition loop; described traveling wave MCU is connected with described high-speed data acquisition loop; described high-speed data acquisition loop is used for record trouble traveling wave data, and described traveling wave MCU is used for the fault traveling wave data analyzed and processed from described high-speed data acquisition loop.
2. the supertension line guard method of a kind of integrated travelling wave ranging function according to claim 1, it is characterised in that the sample frequency of described traveling wave CPU is 2MHz.
3. the supertension line guard method of a kind of integrated travelling wave ranging function according to claim 1; it is characterized in that; described travelling wave ranging adopts both-end distance measuring algorithm, including: being rushed to, with first initial row wave, the time difference reaching two ends and find range, concrete range finding formula is:
In above formula, L is line length, v1For line mould velocity of wave, tM,tNThe absolute time at two ends, D is arrived for traveling waveMFFor the trouble point distance from protection installation place, M side; Needing the correct time that the initial traveling wave of fault inspecting arrives two-sided measurement end can complete fault location, the traveling wave CPU of both sides adopts the optical-fibre channel of configuration on supervoltage line protective device to complete sharing of both sides travelling wave ranging data.
4. the supertension line guard method of a kind of integrated travelling wave ranging function according to claim 3, it is characterised in that described travelling wave ranging specifically includes following steps:
After breaking down on step SS1 circuit, this side starts with the traveling wave CPU of offside, protection CPU, and traveling wave CPU starts the negative supply of open exit relay;
The traveling wave CPU of this side supervoltage line protective device of step SS2 calculates the time t that initial traveling wave arrivesM, by the bus on motherboard, this side result is sent to protection CPU, the protection CPU action of this side supervoltage line protective device;
The traveling wave CPU of step SS3 offside supervoltage line protective device calculates the time t that initial traveling wave arrivesN, and complete the mutual of both sides traveling wave time of advent by optical-fibre channel, offside result is sent to the traveling wave CPU of this side supervoltage line protective device;
The traveling wave CPU of this side supervoltage line protective device of step SS4 receives the t that offside calculatesN, complete fault travelling wave ranging algorithm and export the man-machine module monitor board to this side supervoltage line protective device.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106226588A (en) * | 2016-07-05 | 2016-12-14 | 国家电网公司 | A kind of optical current acquisition method adapting to travelling wave ranging demand |
| CN106526421A (en) * | 2016-11-09 | 2017-03-22 | 中国南方电网有限责任公司 | Method for adding current traveling wave signal acquisition to transmission line matching device |
| CN107124247A (en) * | 2017-03-10 | 2017-09-01 | 中国南方电网有限责任公司 | Communication means between route protection travelling wave ranging integrated apparatus and its traveling wave information station |
| CN108761191A (en) * | 2018-08-27 | 2018-11-06 | 南京国电南自电网自动化有限公司 | A kind of traveling-wave protection Acquisition Circuit |
| CN110888014A (en) * | 2019-10-15 | 2020-03-17 | 国电南瑞科技股份有限公司 | Line protection traveling wave distance measurement method and device |
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