CN111817272B - Single-phase high-resistance earth fault relay protection method for power transmission line based on earth point arc light voltage amplitude characteristic - Google Patents
Single-phase high-resistance earth fault relay protection method for power transmission line based on earth point arc light voltage amplitude characteristic Download PDFInfo
- Publication number
- CN111817272B CN111817272B CN202010650242.0A CN202010650242A CN111817272B CN 111817272 B CN111817272 B CN 111817272B CN 202010650242 A CN202010650242 A CN 202010650242A CN 111817272 B CN111817272 B CN 111817272B
- Authority
- CN
- China
- Prior art keywords
- transmission line
- power transmission
- fault
- relay protection
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a relay protection method for a single-phase high-resistance earth fault of a power transmission line based on the characteristic of earth point arc photovoltage amplitude. The method comprises the steps of firstly measuring fault phase voltage, fault phase current and zero sequence current at two ends of a power transmission line, calculating the fault phase voltage at the other end of the power transmission line by using the fault phase voltage, the fault phase current and the zero sequence current at one end of the power transmission line, calculating the earth point arc photovoltage of the power transmission line, and forming a single-phase high-resistance earth fault relay protection criterion of the power transmission line by using the earth point arc photovoltage of the power transmission line and the rated phase voltage of the power transmission line. The invention adopts lumped parameter modeling, has simple algorithm principle, easy program realization, small algorithm operand and high protection action speed. The method has the advantages that the influence of the ground point arc photovoltage of the power transmission line is considered in the algorithm model, the influence of the transition resistance and the load current is eliminated, the method has strong capability of tolerating the influence of the transition resistance and the load current, and the method is suitable for relay protection of the whole fault process after the single-phase high-resistance ground fault of the power transmission line.
Description
Technical Field
The invention relates to the technical field of power system relay protection, in particular to a single-phase high-resistance earth fault relay protection method for a power transmission line based on the characteristic of earth point arc photovoltage amplitude.
Background
The relay protection is used as a first line of defense for guaranteeing safe and stable operation of a power grid, and accurate and quick action of the relay protection is vital to fault isolation and accident spread prevention. Traditional backup protection is based on local electrical quantity, and needs to be matched with an offline preset value to ensure the selectivity of protection action. The outstanding problems existing in the mode are that the protection setting is complex, the action is long in time delay, and the safety and stability requirements of the modern complex power grid are difficult to meet. Under the condition of large-range tide transfer, the far backup protection is easy to interlock and malfunction, and then the breakdown of the power grid is accelerated.
In recent years, with the development of wide area measurement technology and the popularization and application of the wide area measurement technology in the chinese power grid, all the voltage class substations of 500kV and above and 60MW power plants of the chinese power grid are equipped with a Phasor Measurement Unit (PMU), and some important 330kV and 220kV hub substations are also equipped with PMUs, so that the research of power grid protection based on wide area information is receiving wide attention. The power transmission line fault relay protection algorithm based on the wide area information is a core component of power grid protection based on the wide area information. The wide-area backup protection algorithm based on fault voltage distribution, published by wanghua, zhangtaimen and yimingen et al, adopts lumped parameter modeling, utilizes the measured values of voltage and current fault components on one side of the line to estimate the voltage fault components on the other side, and uses the ratio of the estimated values to the measured values to form the power transmission line protection criterion. The electric quantity which participates in calculation is a fault component, and is only suitable for relay protection in two cycles after the transmission line has a fault; the action performance of the method is seriously influenced by the transition resistance, and when the high-resistance grounding fault of the power transmission line occurs, the condition of refusing action can occur, and the fault line cannot be isolated from the power grid in time; the method is affected by the system operation mode in principle because of the relation with the system impedance parameter.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a single-phase high-resistance earth fault relay protection method for a power transmission line based on the amplitude characteristic of earth point arc photovoltage for calculating the earth point arc photovoltage of the power transmission line in real time, wherein the action performance of the relay protection method is not influenced by transition resistance, fault position, load current and the operation mode of a power system.
The relay protection method for the single-phase high-resistance earth fault of the power transmission line based on the earth point arc photovoltage amplitude characteristic is characterized by comprising the following steps in sequence:
(1) relay protection device measures fault phase voltage of power transmission line at protection installation position of m transformer substations
Fault phase current
And zero sequence current
Measuring fault phase voltage of power transmission line at n transformer substation protection installation position
Fault phase current
And zero sequence current
Wherein phi is A, B, C phases;
(2) relay protection device using fault phase voltage
Fault phase current
And zero sequence current
Calculating the fault phase voltage of the power transmission line at the protection installation position of the m transformer substations
Wherein z is1Is the positive sequence impedance of the transmission line with unit length; z is a radical of0Zero sequence impedance of the transmission line is unit length; l is the length of the transmission line;
(3) relay protection device for calculating grounding point arc light voltage of power transmission line
(4) Relay protection device judgment
If the single-phase high-resistance grounding fault is established, judging that the power transmission line has the single-phase high-resistance grounding fault, and sending a tripping signal by a relay protection device to trip circuit breakers at two ends of the power transmission line; wherein the content of the first and second substances,
and the rated phase voltage is used for the transmission line.
The invention has the characteristics and technical achievements that:
the method calculates the ground point arc photovoltage of the power transmission line in real time, utilizes the amplitude characteristic of the ground point arc photovoltage of the power transmission line to form the relay protection criterion of the single-phase high-resistance ground fault of the power transmission line, takes the influence of the ground point arc photovoltage of the power transmission line into consideration by an algorithm model, eliminates the influence of transition resistance and load current in principle, has strong capacity of tolerating the influence of the transition resistance and the load current, and is suitable for relay protection of the whole fault process after the single-phase high-resistance ground fault of the power transmission line. The method adopts lumped parameter modeling, has simple algorithm principle, easy program realization, small algorithm operand and high protection action speed.
Drawings
Fig. 1 is a schematic diagram of a line transmission system to which the present invention is applied.
Detailed Description
The technical scheme of the invention is further detailed in the following according to the attached drawings of the specification.
Fig. 1 is a schematic diagram of a line transmission system to which the present invention is applied. In fig. 1, the CVT is a voltage transformer, and the CT is a current transformer. Relay protection device measures fault phase voltage of power transmission line at protection installation position of m transformer substations
Fault phase current
And zero sequence current
Measuring fault phase voltage of power transmission line at n transformer substation protection installation position
Fault phase current
And zero sequence current
Wherein phi is A, B, C phases.
Relay protection device using fault phase voltage
Fault phase current
And zero sequence current
Calculating the fault phase voltage of the power transmission line at the protection installation position of the m transformer substations
Wherein z is1Is the positive sequence impedance of the transmission line with unit length; z is a radical of0Zero sequence impedance of the transmission line is unit length; l is the length of the transmission line;
relay protection device for calculating grounding point arc light voltage of power transmission line
Relay protection device for judging electric transmission line grounding point arc light voltage amplitude
If the single-phase high-resistance grounding fault is established, judging that the power transmission line has the single-phase high-resistance grounding fault, and sending a tripping signal by a relay protection device to trip circuit breakers at two ends of the power transmission line; wherein the content of the first and second substances,
and the rated phase voltage is used for the transmission line.
The method calculates the ground point arc photovoltage of the power transmission line in real time, utilizes the amplitude characteristic of the ground point arc photovoltage of the power transmission line to form the relay protection criterion of the single-phase high-resistance ground fault of the power transmission line, takes the influence of the ground point arc photovoltage of the power transmission line into consideration by an algorithm model, eliminates the influence of transition resistance and load current in principle, has strong capacity of tolerating the influence of the transition resistance and the load current, and is suitable for relay protection of the whole fault process after the single-phase high-resistance ground fault of the power transmission line. The method adopts lumped parameter modeling, has simple algorithm principle, easy program realization, small algorithm operand and high protection action speed.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (1)
1. The relay protection method for the single-phase high-resistance earth fault of the power transmission line based on the earth point arc photovoltage amplitude characteristic is characterized by comprising the following steps in sequence:
(1) relay protection device measures fault phase voltage of power transmission line at protection installation position of m transformer substations
Fault phase current
And zero sequence current
Measuring fault phase voltage of power transmission line at n transformer substation protection installation position
Fault phase current
And zero sequenceElectric current
Wherein φ is A, B, C phases;
(2) relay protection device using fault phase voltage
Fault phase current
And zero sequence current
Calculating the fault phase voltage of the power transmission line at the protection installation position of the m transformer substations
Wherein z is1Is the positive sequence impedance of the transmission line with unit length; z is a radical of0Zero sequence impedance of the transmission line is unit length; l is the length of the transmission line;
(3) relay protection device for calculating grounding point arc light voltage of power transmission line
(4) Relay protection device judgment
If the single-phase high-resistance grounding fault is established, judging that the power transmission line has the single-phase high-resistance grounding fault, and sending a tripping signal by a relay protection device to trip circuit breakers at two ends of the power transmission line; wherein the content of the first and second substances,
for transfusionThe electrical lines are rated for phase voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010650242.0A CN111817272B (en) | 2020-07-08 | 2020-07-08 | Single-phase high-resistance earth fault relay protection method for power transmission line based on earth point arc light voltage amplitude characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010650242.0A CN111817272B (en) | 2020-07-08 | 2020-07-08 | Single-phase high-resistance earth fault relay protection method for power transmission line based on earth point arc light voltage amplitude characteristic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111817272A CN111817272A (en) | 2020-10-23 |
| CN111817272B true CN111817272B (en) | 2022-05-13 |
Family
ID=72841978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010650242.0A Active CN111817272B (en) | 2020-07-08 | 2020-07-08 | Single-phase high-resistance earth fault relay protection method for power transmission line based on earth point arc light voltage amplitude characteristic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111817272B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104078951B (en) * | 2014-07-16 | 2016-11-23 | 国家电网公司 | A kind of based on inter-phase arc voltage characteristic line inter-phase fault two end protection method |
| CN104078953B (en) * | 2014-07-16 | 2017-06-09 | 国家电网公司 | A kind of transmission line of electricity inter-phase arc voltage protection method |
| CN104092199A (en) * | 2014-07-25 | 2014-10-08 | 国家电网公司 | Line single-phase grounding voltage protection method based on distribution characteristics of voltage amplitudes along line |
| CN107276097B (en) * | 2017-07-05 | 2018-10-09 | 长沙理工大学 | Non-effectively earthed system earth fault is mutually depressured the method for safe operation of extinguishing arc |
-
2020
- 2020-07-08 CN CN202010650242.0A patent/CN111817272B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111817272A (en) | 2020-10-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106501675B (en) | The wind farm grid-connected instantaneous singlephase earth fault method of single end distance measurement of transmission line of electricity | |
| CN103364692B (en) | A kind of power distribution network single-phase grounded malfunction in grounded system selection method | |
| WO2013185521A1 (en) | Full component differential coefficient matrix-based method for ultra-high-voltage alternating current electric power transmission line protection | |
| CN102879671B (en) | Method for judging inrush current locking of equivalent instantaneous inductance for protection of extra-high voltage regulating transformer | |
| CN110261723A (en) | A kind of small current earthing wire-selecting method based on the coefficient of variation and Higher Order Cumulants | |
| CN103149493B (en) | Electric transmission line one-phase grounding fault type diagnostic method | |
| CN111817273B (en) | Extra-high voltage same-tower double-circuit line ground fault relay protection method based on six-sequence component method | |
| CN103296654A (en) | Line single-phase earth fault relay protection method implemented by aid of distributed parameters | |
| CN111817272B (en) | Single-phase high-resistance earth fault relay protection method for power transmission line based on earth point arc light voltage amplitude characteristic | |
| CN103779847B (en) | Based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase | |
| CN104953565B (en) | Line interphase fault relay protection method is surveyed based on transition resistance | |
| CN104332973A (en) | Line interphase short circuit fault relay protection method through fault active power | |
| Lu et al. | The effects of the current transformer saturation on mal-operation under the DC magnetic bias caused by HVDC | |
| CN104078950A (en) | Ultra-high voltage transmission line relay protection method based on positive-sequence break variable differential coefficient matrix | |
| CN103701096A (en) | Interturn protection method of TCT type controllable high-resistance triangular connecting winding | |
| CN103227456A (en) | Single-phase earth fault distance protection method of power transmission line | |
| CN104078951B (en) | A kind of based on inter-phase arc voltage characteristic line inter-phase fault two end protection method | |
| CN103296646A (en) | Line single-phase earth fault distance protection method implemented by aid of distributed parameters | |
| Xi et al. | The Study of Mechanism and Limit Measures for 500kV Single Phase Short Circuit Current Exceeding Limit in UHVDC Converter Station | |
| CN103779850B (en) | Based on directly adopting straight jumping communication mode double-circuit line single-phase earthing distance protecting method | |
| Hao et al. | Active and Passive Voltage Arc-suppression Technology in Distribution Network | |
| CN103248024A (en) | Line current differential protection method capable of preventing influences of both transitional resistance and load current | |
| Meng et al. | Application of 66kV active intervention grounding arc suppression device | |
| CN202404194U (en) | On-pole demarcation switch intelligent terminal used for distinguishing single-phase earth fault of power distribution network | |
| Piskunov et al. | Technical solutions for automation of distribution networks based on SPM technology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |