CN103762574A - Double-circuit line non-same-name-phase overline grounded impedance distance protection method - Google Patents
Double-circuit line non-same-name-phase overline grounded impedance distance protection method Download PDFInfo
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- CN103762574A CN103762574A CN201410054043.8A CN201410054043A CN103762574A CN 103762574 A CN103762574 A CN 103762574A CN 201410054043 A CN201410054043 A CN 201410054043A CN 103762574 A CN103762574 A CN 103762574A
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- 238000009434 installation Methods 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims 1
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- 230000005540 biological transmission Effects 0.000 description 3
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Abstract
The invention discloses a double-circuit line non-same-name-phase overline grounded impedance distance protection method. The method includes the steps that the fault phase voltage, the fault phase current and the zero-sequence current of a protecting and installing position of a circuit line I of a double-circuit line on the same tower are measured; the phase angle of the zero-sequence current of a circuit line II of the double-circuit line on the same tower is calculated, and the zero-sequence current of the circuit line II of the double-circuit line on the same tower is calculated; then line fault impedance from the protecting and installing position of the circuit line I of the double-circuit line on the same tower to a grounded fault point is calculated; whether the amplitude of the line fault impedance is smaller than a set impedance amplitude or not is judged, and if yes, a tripping-off signal is sent out. Only single-end single-circuit line electric amount is used without introducing the electric amount of the other circuit line, and measurement results are not affected by changes of operation modes of the electric power system. Influence of zero-sequence mutual inductance between the lines and the voltage of the grounded fault point is considered, and the influence on the motion performance of on-the-same-tower double-circuit line non-same-name-phase overline grounded impedance distance protection by the zero-sequence mutual inductance between the lines, transition resistance and a load current is eliminated.
Description
Technical Field
The invention relates to the technical field of relay protection of power systems, in particular to a double-circuit line non-homonymous phase overline grounding impedance distance protection method.
Background
The double-circuit line on the same tower has the advantages of small occupied area, low manufacturing cost and stable and reliable operation of connecting a power grid, and becomes a common power transmission line connecting mode of a power system. Zero sequence mutual inductance exists between double-circuit lines on the same tower, the zero sequence mutual inductance influences zero sequence compensation coefficients, additional impedance is further generated, the additional impedance caused by the zero sequence mutual inductance can cause the fault impedance measured by a protection device to be larger than the actual fault impedance, and when ground fault occurs at the position close to a protection setting range in a protection area of the double-circuit lines on the same tower, the protection is rejected, and the safe and stable operation of a power grid is not good.
Even if the double-circuit line on the same tower is directly grounded through a tower, the transition resistance is near 10 omega in the area with lower soil resistivity; the transition resistance may reach 30 omega, or even higher, where the resistivity is higher. The transition resistance is not zero so that the fault impedance calculated by the protection device comprises an additional impedance generated by the transition resistance in addition to a fault impedance component reflecting the real fault distance. The additional impedance generated by the transition resistance is resistive-inductive or resistive-capacitive, which easily causes the earth impedance distance protection to reject or exceed a steady state. Protection malfunction or failure brings great loss to the safe operation of the power system, and even possibly threatens the stability of the power system.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a grounding impedance distance method which has the action performance not influenced by zero sequence mutual inductance between lines, transition resistance and load current and is suitable for non-same-name-phase overline grounding faults of double-circuit lines.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method for protecting the distance between the two-circuit line non-homonymous phase overline grounding impedance is characterized by comprising the following steps in sequence:
(1) the protection device measures the fault phase voltage at the protection installation position of the I-loop circuit of the double-loop circuit on the same tower
Fault phase current
And zero sequence current
Wherein phi is the phase A of the I-loop circuit, the phase B of the I-loop circuit or the phase C of the I-loop circuit;
(2) the protection device calculates the zero-sequence current phase angle alpha of the II-loop line of the double-loop line on the same tower:
α=r1+r2-π-β
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Zmzero sequence mutual inductance between the circuit I of the double-circuit line on the same tower and the circuit II of the double-circuit line on the same tower is achieved; zI0Zero sequence impedance of I-loop circuit of double-loop circuit on the same tower; zI1The positive sequence impedance of the I-loop line of the double-loop line on the same tower is obtained; phi = I loop line A phase, I loop line B phase, I loop line C phase;
(3) the protection device calculates the zero sequence current of the II-loop line of the double-loop line on the same tower
(4) The protection device calculates the line fault impedance Z from the I-loop line protection installation position to the ground fault point of the double-loop line on the same towerφ：
Wherein Z isI0Zero sequence impedance of I-loop circuit of double-loop circuit on the same tower; zI1The positive sequence impedance of the I-loop line of the double-loop line on the same tower is obtained; phi is a phase A of the loop circuit, a phase B of the loop circuit I or a phase C of the loop circuit I; zmZero sequence mutual inductance between the circuit I of the double-circuit line on the same tower and the circuit II of the double-circuit line on the same tower is achieved;
(5) protection device judgment
If yes, judging that the ground fault point is located in the I-loop circuit protection setting range of the double-loop circuit on the same tower, and sending an action trip signal by the protection device; wherein lsetProtecting and setting a range for a circuit I of a double-circuit line on the same tower; l is the length of the I loop of the double-loop line on the same tower.
The invention has the characteristics and technical achievements that:
the method comprises the steps of firstly measuring fault phase voltage, fault phase current and zero sequence current at the protection installation position of the same-tower double-circuit line I loop, calculating a zero sequence current phase angle of the same-tower double-circuit line II loop, calculating the zero sequence current of the same-tower double-circuit line II loop, then calculating the line fault impedance from the protection installation position of the same-tower double-circuit line I loop to a ground fault point, judging whether the line fault impedance amplitude is smaller than the setting impedance amplitude, and if so, sending an action trip signal.
The method only uses the single-end single-loop line electric quantity, does not need to introduce another loop line electric quantity, has no influence on the action performance by the operation mode of the power system, and has strong adaptability when the operation mode of the power system is greatly changed. The method of the invention takes the influence of zero sequence mutual inductance between lines and the voltage of a ground fault point into consideration, eliminates the influence of the zero sequence mutual inductance between the lines, the transition resistance and the load current on the non-same-name-phase overline ground impedance distance protection action performance of the double-circuit lines on the same tower, and has stable and reliable protection range.
Drawings
Fig. 1 is a schematic diagram of a double-circuit power transmission system on the same tower and with the application of the invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic diagram of a double-circuit power transmission system on the same tower and with the application of the invention. The protection device measures the fault phase voltage at the protection installation position of the I-loop circuit of the double-loop circuit on the same tower
Fault phase current
And zero sequence currentWherein φ is the phase A of the I-loop circuit, the phase B of the I-loop circuit or the phase C of the I-loop circuit.
The protection device calculates the zero-sequence current phase angle alpha of the II-loop line of the double-loop line on the same tower:
α=r1+r2-π-β
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Zmzero sequence mutual inductance between the circuit I of the double-circuit line on the same tower and the circuit II of the double-circuit line on the same tower is achieved; zI0Zero sequence impedance of I-loop circuit of double-loop circuit on the same tower; zI1The positive sequence impedance of the I-loop line of the double-loop line on the same tower is obtained; phi is phase A of the I-loop circuit, phase B of the I-loop circuit or phase C of the I-loop circuit.
The protection device calculates the zero sequence current of the II-loop line of the double-loop line on the same tower
The protection device calculates the line fault impedance Z from the I-loop line protection installation position to the ground fault point of the double-loop line on the same towerφ：
Wherein Z isI0Zero sequence impedance of I-loop circuit of double-loop circuit on the same tower; zI1The positive sequence impedance of the I-loop line of the double-loop line on the same tower is obtained; phi is phase A of the I-loop circuit, phase B of the I-loop circuit or phase C of the I-loop circuit; zmZero sequence mutual inductance between the circuit I of the double-circuit line on the same tower and the circuit II of the double-circuit line on the same tower is achieved;
protection device judgment
If yes, judging that the ground fault point is located in the I-loop circuit protection setting range of the double-loop circuit on the same tower, and sending an action trip signal by the protection device; wherein lsetProtection setting range for I-loop circuit of double-loop circuit on same tower(ii) a l is the length of the I loop of the double-loop line on the same tower.
The method comprises the steps of firstly measuring fault phase voltage, fault phase current and zero sequence current at the protection installation position of the same-tower double-circuit line I loop, calculating a zero sequence current phase angle of the same-tower double-circuit line II loop, calculating the zero sequence current of the same-tower double-circuit line II loop, then calculating the line fault impedance from the protection installation position of the same-tower double-circuit line I loop to a ground fault point, judging whether the line fault impedance amplitude is smaller than the setting impedance amplitude, and if so, sending an action trip signal.
The method only uses the single-end single-loop line electric quantity, does not need to introduce another loop line electric quantity, has no influence on the action performance by the operation mode of the power system, and has strong adaptability when the operation mode of the power system is greatly changed. The method of the invention takes the influence of zero sequence mutual inductance between lines and the voltage of a ground fault point into consideration, eliminates the influence of the zero sequence mutual inductance between the lines, the transition resistance and the load current on the non-same-name-phase overline ground impedance distance protection action performance of the double-circuit lines on the same tower, and has stable and reliable protection range.
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 method for protecting the distance of the non-homonymous phase overline grounding impedance of the double-circuit line comprises the following steps in sequence:
(1) the protection device measures the fault phase voltage at the protection installation position of the I-loop circuit of the double-loop circuit on the same tower
Fault phase current
And zero sequence current
Wherein phi is the phase A of the I-loop circuit, the phase B of the I-loop circuit or the phase C of the I-loop circuit;
(2) the protection device calculates the zero-sequence current phase angle alpha of the II-loop line of the double-loop line on the same tower:
α=r1+r2-π-β
wherein, <math>
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Zmzero sequence mutual inductance between the circuit I of the double-circuit line on the same tower and the circuit II of the double-circuit line on the same tower is achieved; zI0Zero sequence impedance of I-loop circuit of double-loop circuit on the same tower; zI1The positive sequence impedance of the I-loop line of the double-loop line on the same tower is obtained; phi is phase A of the I-loop circuit, phase B of the I-loop circuit or phase C of the I-loop circuit;
(3) the protection device calculates the zero sequence current of the II-loop line of the double-loop line on the same tower
(4) Protective device calculates double-circuit line on same towerLine fault impedance Z from line I loop line protection installation to ground fault pointφ：
Wherein Z isI0Zero sequence impedance of I-loop circuit of double-loop circuit on the same tower; zI1The positive sequence impedance of the I-loop line of the double-loop line on the same tower is obtained; phi = I loop line A phase or I loop line B phase or I loop line C phase; zmZero sequence mutual inductance between the circuit I of the double-circuit line on the same tower and the circuit II of the double-circuit line on the same tower is achieved;
(5) protection device judgment
If yes, judging that the ground fault point is located in the I-loop circuit protection setting range of the double-loop circuit on the same tower, and sending an action trip signal by the protection device; wherein lsetProtecting and setting a range for a circuit I of a double-circuit line on the same tower; l is the length of the I loop of the double-loop line on the same tower.
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| CN104049180A (en) * | 2014-07-04 | 2014-09-17 | 国家电网公司 | Double-circuit line non-in-phase jumper wire earth fault single-end distance measurement method |
| CN104049181A (en) * | 2014-07-04 | 2014-09-17 | 国家电网公司 | Double-circuit line non-synonymous cross-line grounding fault discrimination method |
| CN104950225A (en) * | 2015-06-17 | 2015-09-30 | 国家电网公司 | Double-circuit line different phase overline grounding fault direction decision method |
| CN104950224A (en) * | 2015-06-17 | 2015-09-30 | 国家电网公司 | Double-circuit line different phase overline grounding fault single-terminal location method |
| CN104950228A (en) * | 2015-06-17 | 2015-09-30 | 国家电网公司 | Double-circuit parallel transmission line single phase grounding fault point transition resistance value measuring method |
| CN104950223A (en) * | 2015-06-17 | 2015-09-30 | 国家电网公司 | Double-circuit non-homonymous phase interline high-resistance grounding fault identification method based on grounding resistance actual measurement |
| CN104950224B (en) * | 2015-06-17 | 2018-07-24 | 国家电网公司 | The non-same famous prime minister's cross-line earth fault method of single end distance measurement of double-circuit line |
| CN105024362A (en) * | 2015-07-01 | 2015-11-04 | 国家电网公司 | Method for eliminating single-phase grounding transitional resistance of double loops of same tower |
| CN105024362B (en) * | 2015-07-01 | 2018-11-30 | 国家电网公司 | A method of for eliminating common-tower double-return line single-phase earthing transition resistance |
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