CN103245818B - Transmission line one-phase earth fault point voltage measuring method - Google Patents
Transmission line one-phase earth fault point voltage measuring method Download PDFInfo
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- CN103245818B CN103245818B CN201310129465.2A CN201310129465A CN103245818B CN 103245818 B CN103245818 B CN 103245818B CN 201310129465 A CN201310129465 A CN 201310129465A CN 103245818 B CN103245818 B CN 103245818B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000005611 electricity Effects 0.000 claims abstract description 16
- 238000009434 installation Methods 0.000 claims abstract description 7
- 230000001681 protective effect Effects 0.000 claims description 10
- 230000001012 protector Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 230000007704 transition Effects 0.000 abstract description 3
- 238000003745 diagnosis Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
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Abstract
The invention discloses a kind of transmission line one-phase earth fault point voltage measuring method.The inventive method measures the faulted phase voltage of line protection installation place, fault phase negative-sequence current, faulted phase current and zero-sequence current; calculate the real part of the ratio of faulted phase voltage and fault phase negative-sequence current; the real part of the ratio of the transmission line of electricity voltage drop of unit of account length and fault phase negative-sequence current; be multiplied by fault phase negative-sequence current again after utilizing the real part of the ratio of faulted phase voltage and fault phase negative-sequence current to deduct the real part of the ratio of the voltage drop of unit length transmission line of electricity and fault phase negative-sequence current, obtain transmission line one-phase earth fault point voltage.The inventive method utilizes single-end electrical quantity to achieve the accurate measurement of transmission line one-phase earth fault point voltage, and measuring accuracy is not by the impact of abort situation, transition resistance and load current, and algorithm principle is simple, and operand is few, measures real-time.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, specifically relate to a kind of transmission line one-phase earth fault point voltage measuring method.
Background technology
By the real-time measurement to transmission line one-phase earth fault point voltage, what be conducive to grasping in time singlephase earth fault thermally-stabilised and Dynamic stability on transmission line of electricity affects situation, for guaranteeing that transmission line of electricity safety and power grid operation provide reliable decision-making foundation.
By the real-time measurement to transmission line one-phase earth fault point voltage, inline diagnosis can be carried out to the low middle high resistance grounding fault type of transmission line of electricity according to Single-phase Ground Connection Failure voltage magnitude size cases, for transmission line malfunction line walking provides reference frame, win the quality time for fixing a breakdown and restoring electricity.
But; current technical field of relay protection not yet proposes a kind of measuring method of energy accurate Calculation transmission line one-phase earth fault point voltage; cannot in order to grasp in time, singlephase earth fault be thermally-stabilised on transmission line of electricity, the situation that affects of Dynamic stability provides reliable decision-making foundation, also cannot carry out diagnosis to the low middle high resistance grounding fault type of transmission line of electricity provides scientific basis.
Summary of the invention
The object of the invention is to the deficiency overcoming prior art existence, a kind of transmission line one-phase earth fault point voltage measuring method is provided.
Transmission line one-phase earth fault point voltage measuring method, its main points are, comprise the steps:
(1) faulted phase voltage of protector measuring line protection installation place
, fault phase negative-sequence current
, faulted phase current
and zero-sequence current
, as input quantity; Wherein, φ=A, B, C phase;
(2) protective device calculates faulted phase voltage
with fault phase negative-sequence current
the real part of ratio
;
(3) protective device unit of account length transmission line of electricity voltage drop
with fault phase negative-sequence current
the real part of ratio
; Wherein, z
1, z
0be respectively the impedance of unit length electric transmission line positive sequence, zero sequence impedance;
(4) protective device computing electric power line Single-phase Ground Connection Failure voltage
.
The present invention compared with prior art, has following positive achievement:
The inventive method measures the faulted phase voltage of line protection installation place, fault phase negative-sequence current, faulted phase current and zero-sequence current; calculate the real part of the ratio of faulted phase voltage and fault phase negative-sequence current; the real part of the ratio of the transmission line of electricity voltage drop of unit of account length and fault phase negative-sequence current; be multiplied by fault phase negative-sequence current again after utilizing the real part of the ratio of faulted phase voltage and fault phase negative-sequence current to deduct the real part of the ratio of the voltage drop of unit length transmission line of electricity and fault phase negative-sequence current, obtain transmission line one-phase earth fault point voltage.The inventive method utilizes single-end electrical quantity to achieve the accurate measurement of transmission line one-phase earth fault point voltage, and measuring accuracy is not by the impact of abort situation, transition resistance and load current, and algorithm principle is simple, and operand is few, measures real-time.
Accompanying drawing explanation
Fig. 1 is application multi-line power transmission system schematic of the present invention.
Embodiment
According to Figure of description, technical scheme of the present invention is expressed in further detail below.
Fig. 1 is application multi-line power transmission system schematic of the present invention.In Fig. 1, PT is voltage transformer (VT), CT is current transformer.The current waveform of protective device to the voltage waveform summation current transformer CT of the voltage transformer pt of line protection installation place carries out sampling and obtains voltage, current instantaneous value, and utilizes Fourier algorithm computing electric power line to protect the faulted phase voltage of installation place to its voltage, current instantaneous value obtained of sampling
, fault phase negative-sequence current
, faulted phase current
and zero-sequence current
, as input quantity; Wherein, φ=A phase, B phase, C phase.
Protective device calculates faulted phase voltage
with fault phase negative-sequence current
the real part of ratio
.
The voltage drop of protective device unit of account length transmission line of electricity
with fault phase negative-sequence current
the real part of ratio
; Wherein, z
1, z
0be respectively the impedance of unit length electric transmission line positive sequence, zero sequence impedance.
Protective device is multiplied by fault phase negative-sequence current after utilizing the real part of the ratio of faulted phase voltage and fault phase negative-sequence current to deduct the real part of the ratio of the voltage drop of unit length transmission line of electricity and fault phase negative-sequence current again, obtains transmission line one-phase earth fault point voltage
:
The inventive method measures the faulted phase voltage of line protection installation place, fault phase negative-sequence current, faulted phase current and zero-sequence current; calculate the real part of the ratio of faulted phase voltage and fault phase negative-sequence current; the real part of the ratio of the transmission line of electricity voltage drop of unit of account length and fault phase negative-sequence current; be multiplied by fault phase negative-sequence current again after utilizing the real part of the ratio of faulted phase voltage and fault phase negative-sequence current to deduct the real part of the ratio of the voltage drop of unit length transmission line of electricity and fault phase negative-sequence current, obtain transmission line one-phase earth fault point voltage.The inventive method utilizes single-end electrical quantity to achieve the accurate measurement of transmission line one-phase earth fault point voltage, and measuring accuracy is not by the impact of abort situation, transition resistance and load current, and algorithm principle is simple, and operand is few, measures real-time.
The foregoing is only preferred embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.
Claims (1)
1. transmission line one-phase earth fault point voltage measuring method, comprises the steps:
(1) faulted phase voltage of protector measuring line protection installation place
fault phase negative-sequence current
faulted phase current
and zero-sequence current
as input quantity; Wherein, φ is fault phase, and it is the phase in A phase, B phase or C phase, it is characterized in that, also comprises step
(2) protective device calculates faulted phase voltage
with fault phase negative-sequence current
the real part of ratio
(3) protective device unit of account length transmission line of electricity voltage drop
with fault phase negative-sequence current
the real part of ratio
wherein, z
1, z
0be respectively the impedance of unit length electric transmission line positive sequence, zero sequence impedance;
(4) protective device computing electric power line Single-phase Ground Connection Failure voltage
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310129465.2A CN103245818B (en) | 2013-04-15 | 2013-04-15 | Transmission line one-phase earth fault point voltage measuring method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310129465.2A CN103245818B (en) | 2013-04-15 | 2013-04-15 | Transmission line one-phase earth fault point voltage measuring method |
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| CN103245818A CN103245818A (en) | 2013-08-14 |
| CN103245818B true CN103245818B (en) | 2015-08-05 |
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| CN104714078A (en) * | 2015-04-01 | 2015-06-17 | 厦门理工学院 | Method for analyzing level signals and method for triggering release |
Citations (7)
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|---|---|---|---|---|
| CN1056583A (en) * | 1991-06-08 | 1991-11-27 | 天津汉沽供电局 | The detection method of small current neutral grounding and device |
| CN1397807A (en) * | 2002-08-16 | 2003-02-19 | 华中科技大学 | Method for positioning grounding failure region of feed line in low-current grounding system |
| DE10251001B3 (en) * | 2002-10-30 | 2004-02-26 | Siemens Ag | Earth short-circuit fault signal provision method for multi-phase transmission line monitoring with detection of phase current transducer saturation |
| CN1525186A (en) * | 2003-02-28 | 2004-09-01 | 上海华联低压电器厂 | Electric line fault location device |
| CN101183133A (en) * | 2007-11-29 | 2008-05-21 | 北京四方继保自动化股份有限公司 | Phase amount and zero sequence amount combined realization powerline both-end distance measuring method |
| CN102200563A (en) * | 2011-01-20 | 2011-09-28 | 福建省电力有限公司福州超高压输变电局 | Line single-phase earth fault single-terminal location method based on positioning function amplitude characteristics |
| CN102707197A (en) * | 2012-06-11 | 2012-10-03 | 福建省电力有限公司检修分公司 | Distance measuring method and type diagnostic method of single-phase grounding fault of electric transmission line |
-
2013
- 2013-04-15 CN CN201310129465.2A patent/CN103245818B/en active Active
Patent Citations (7)
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|---|---|---|---|---|
| CN1056583A (en) * | 1991-06-08 | 1991-11-27 | 天津汉沽供电局 | The detection method of small current neutral grounding and device |
| CN1397807A (en) * | 2002-08-16 | 2003-02-19 | 华中科技大学 | Method for positioning grounding failure region of feed line in low-current grounding system |
| DE10251001B3 (en) * | 2002-10-30 | 2004-02-26 | Siemens Ag | Earth short-circuit fault signal provision method for multi-phase transmission line monitoring with detection of phase current transducer saturation |
| CN1525186A (en) * | 2003-02-28 | 2004-09-01 | 上海华联低压电器厂 | Electric line fault location device |
| CN101183133A (en) * | 2007-11-29 | 2008-05-21 | 北京四方继保自动化股份有限公司 | Phase amount and zero sequence amount combined realization powerline both-end distance measuring method |
| CN102200563A (en) * | 2011-01-20 | 2011-09-28 | 福建省电力有限公司福州超高压输变电局 | Line single-phase earth fault single-terminal location method based on positioning function amplitude characteristics |
| CN102707197A (en) * | 2012-06-11 | 2012-10-03 | 福建省电力有限公司检修分公司 | Distance measuring method and type diagnostic method of single-phase grounding fault of electric transmission line |
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| 基于分布参数模型的高压输电线路单相接地故障单端测距方法;林富洪等;《电网技术》;20110430;第35卷(第4期);201-205 * |
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