CN110244180A - A kind of DC ice melting route travelling wave ranging method using CVT collection voltages traveling wave - Google Patents
A kind of DC ice melting route travelling wave ranging method using CVT collection voltages traveling wave Download PDFInfo
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- CN110244180A CN110244180A CN201910451568.8A CN201910451568A CN110244180A CN 110244180 A CN110244180 A CN 110244180A CN 201910451568 A CN201910451568 A CN 201910451568A CN 110244180 A CN110244180 A CN 110244180A
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- Prior art keywords
- traveling wave
- cvt
- wave
- collection voltages
- ice
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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
Abstract
The invention discloses a kind of DC ice melting route travelling wave ranging methods using CVT collection voltages traveling wave, it is characterised in that: the following steps are included: according to the wave head of wavelet transformation discrimination voltage traveling wave；The time difference at both ends is reached using the CVT collection voltages traveling wave of route, at the time of record wavefront reaches both ends；Using two time differences calculate fault point to deicing device distance；This travelling wave ranging method reaches the time difference at both ends using the CVT collection voltages wavefront of route, calculate fault point to line ice-melting device side distance, accurate fault location is carried out to DC ice-melting, acquisition opposite side information is not needed, practical is Single Terminal Traveling Wave Fault Location, it does not need additionally to increase traveling wave acquisition device, reduce costs, it is easy to accomplish in engineering.
Description
Technical field
The present invention relates to electric system DC ice melting distance measuring method fields, specifically a kind of to utilize CVT collection voltages
The DC ice melting route travelling wave ranging method of traveling wave.
Background technique
The winter of south China more low temperature congeal weather, and route is easy to appear icing, to eliminate transmission line icing, at present extensively
Application is DC ice melting technology；But when carrying out DC ice melting to route, if line failure, due to the electric current of route
Mutual inductor has logged out operation, is not linked into direct current ice melting system, cannot acquire current traveling wave, can not be mutual using conventional electric current
Sensor carries out travelling wave ranging.
Summary of the invention
The present invention mainly solve the problems, such as it is of the existing technology, provide one kind can during DC ice melting, utilize
The existing CVT device collection voltages traveling wave of DC ice-melting to the DC ice-melting (or ground wire) that breaks down carry out travelling wave ranging without
Need additionally to increase the distance measuring method of current transformer.
The present invention is achieved through technology:
A kind of DC ice melting route travelling wave ranging method using CVT collection voltages traveling wave, it is characterised in that: including following
Step:
S1: according to the wave head of wavelet transformation discrimination voltage traveling wave；DC de-icing device is built to defeated with PSCAD simulation software
The simulation model of electric line (or ground wire) deicing processes, and using wavelet theory carry out DC ice-melting (or ground wire) break down when
Feature extraction, by the feature of the feature extraction fault traveling wave of the modulus maximum of wavelet transformation, by the way that the prominent of waveform is accurately positioned
Height screens fault traveling wave wave head.
S2: using route CVT collection voltages traveling wave reach both ends time difference, record wavefront reach both ends when
It carves, if t1 is that fault point voltage traveling wave reaches A phase CVT, at the time of t2 is that fault point voltage traveling wave reaches B phase CVT；
S3: distance of the fault point to deicing device, calculation formula are calculated using two time differences are as follows:
D is the distance that DC de-icing device side is arrived in fault point, L be opposite side ice-melt short circuit disconnecting link to this side deicing device away from
From v is traveling wave speed, is equal to the light velocity.
The beneficial effects of the present invention are:
This travelling wave ranging method reaches the time difference at both ends using the CVT collection voltages wavefront of route, calculates event
Barrier point arrives the distance of line ice-melting device side, carries out accurate fault location to DC ice-melting, does not need acquisition opposite side information, practical
For Single Terminal Traveling Wave Fault Location, does not need additionally to increase traveling wave acquisition device, reduce costs, it is easy to accomplish in engineering.
Detailed description of the invention
Fig. 1 is the principle of the present invention figure.
Appended drawing reference meaning: 1, DC de-icing device；2, A phase；3, B phase；4, A phase CVT；5, B phase CVT.
Specific embodiment
With reference to the accompanying drawings and examples, technical solution of the present invention is further explained.
As shown in Figure 1, a kind of DC ice melting route travelling wave ranging method using CVT collection voltages traveling wave, feature exist
In: the following steps are included:
S1: according to the wave head of wavelet transformation discrimination voltage traveling wave；DC de-icing device is built to defeated with PSCAD simulation software
The simulation model of electric line (or ground wire) deicing processes, and using wavelet theory carry out DC ice-melting (or ground wire) break down when
Feature extraction, by the feature of the feature extraction fault traveling wave of the modulus maximum of wavelet transformation, by the way that the prominent of waveform is accurately positioned
Height screens fault traveling wave wave head.
S2: reaching the time difference at both ends using A phase CVT4 and B the phase CVT5 collection voltages traveling wave of route, records traveling wave wave
At the time of head reaches both ends, if t1 is that fault point voltage traveling wave reaches A phase CVT4, t2 is the arrival of fault point voltage traveling wave
At the time of B phase CVT5；
S3: distance of the fault point to deicing device, calculation formula are calculated using two time differences are as follows:
D is the distance that DC de-icing device side is arrived in fault point, L be opposite side ice-melt short circuit disconnecting link to this side deicing device away from
From v is traveling wave speed, is equal to the light velocity.
This DC ice melting route travelling wave ranging method does not need acquisition opposite side information, and practical is Single Terminal Traveling Wave Fault Location, is not required to
It identifies second wave head, does not need additionally to increase traveling wave acquisition device.
Simply to illustrate that technical concepts and features of the invention, its purpose is allows in the art above-described embodiment
Those of ordinary skill cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all
It is the equivalent changes or modifications that the essence of content according to the present invention is made, should be covered by the scope of protection of the present invention.
Claims (1)
1. a kind of DC ice melting route travelling wave ranging method using CVT collection voltages traveling wave, it is characterised in that: including following step
It is rapid:
S1: according to the wave head of wavelet transformation discrimination voltage traveling wave；
S2: reaching the time difference at both ends using the CVT collection voltages traveling wave of route, at the time of record wavefront reaches both ends,
If t1 is that fault point voltage traveling wave reaches A phase CVT, at the time of t2 is that fault point voltage traveling wave reaches B phase CVT；
S3: distance of the fault point to deicing device, calculation formula are calculated using two time differences are as follows:
If D is the distance that DC de-icing device side is arrived in fault point, L be opposite side ice-melt short circuit disconnecting link to this side deicing device away from
From v is traveling wave speed, is equal to the light velocity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910451568.8A CN110244180A (en) | 2019-05-28 | 2019-05-28 | A kind of DC ice melting route travelling wave ranging method using CVT collection voltages traveling wave |
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| CN201910451568.8A CN110244180A (en) | 2019-05-28 | 2019-05-28 | A kind of DC ice melting route travelling wave ranging method using CVT collection voltages traveling wave |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946424A (en) * | 2021-02-04 | 2021-06-11 | 南方电网科学研究院有限责任公司 | Method and device for accurately positioning fault |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290059A (en) * | 2000-11-08 | 2001-04-04 | 华中科技大学 | Method for protecting power transmission line and travelling wave sensor for it |
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2019
- 2019-05-28 CN CN201910451568.8A patent/CN110244180A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290059A (en) * | 2000-11-08 | 2001-04-04 | 华中科技大学 | Method for protecting power transmission line and travelling wave sensor for it |
Non-Patent Citations (8)
| Title |
|---|
| 叶睆，张哲，甘磊: "基于CVT二次信号的行波故障定位系统", 《电力自动化》 * |
| 吴仲朗，周书民，汪志成: "基于小波变换与模极大值法的高速铁路牵引网故障行波波头自动识别算法", 《科学技术与工程》 * |
| 孟荣，徐红元，渠红涛: "基于电压行波原理故障测距的相关问题研究", 《电气技术》 * |
| 甘 磊，张 哲，尹项根: "基于CVT二次信号的行波故障定位方法研究", 《电力系统及其自动化专业第二十一届学术年会论文集》 * |
| 甘磊，张哲，叶睆，尹项根，王志华: "基于CVT二次信号的实用化行波定位方法", 《电力系统自动化》 * |
| 邬林勇，何正友，钱清泉: "利用CVT二次信号的频域行波故障测距方法", 《电力系统自幼化》 * |
| 韩浩，陈平，徐丽丽，刘琦吕，晓丽: "直流融冰架空地线单端行波故障测距", 《国网技术学院学报》 * |
| 马丹丹，王晓茹: "基于小波模极大值的单端行波故障测距", 《电力系统保护与控制》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946424A (en) * | 2021-02-04 | 2021-06-11 | 南方电网科学研究院有限责任公司 | Method and device for accurately positioning fault |
| CN112946424B (en) * | 2021-02-04 | 2022-12-06 | 南方电网科学研究院有限责任公司 | Method and device for accurately positioning fault |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190917 |