CN109103846B - Energy extraction reactor protection method and system based on phase comparison and amplitude comparison principle - Google Patents

Energy extraction reactor protection method and system based on phase comparison and amplitude comparison principle Download PDF

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CN109103846B
CN109103846B CN201811139584.5A CN201811139584A CN109103846B CN 109103846 B CN109103846 B CN 109103846B CN 201811139584 A CN201811139584 A CN 201811139584A CN 109103846 B CN109103846 B CN 109103846B
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winding
energy
sequence current
zero sequence
current
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CN109103846A (en
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郭雅蓉
柳焕章
杜丁香
吕鹏飞
郭建勇
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shandong Electric Power Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
State Grid Shandong Electric Power Co Ltd
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    • 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

Abstract

The invention discloses a pumped reactor protection method and a system based on phase comparison and amplitude comparison principles, wherein the method comprises the steps of judging whether the zero sequence current of a main reactance winding, the zero sequence current of a pumped winding side, the zero sequence current break variable of the main reactance winding, the zero sequence current break variable of the pumped winding side and the current change coefficient meet phase comparison criteria or any amplitude comparison criteria, and simultaneously meeting differential threshold criteria to determine whether the pumped reactor is protected to act, and if so, the pumped reactor is protected to act; and on the contrary, the energy-pumping reactor is protected from action. The invention improves the reliability of the protection of the energy-pumping reactor; the energy pumping reactor is protected without voltage, and the protection can reliably act under the condition of PT disconnection; the protection of the energy-pumping reactor can simultaneously protect the turn-to-turn fault of the main reactance winding and the turn-to-turn fault of the energy-pumping winding and other faults with zero-sequence current, thereby avoiding the redundant configuration of the protection; the energy pumping reactor has high protection sensitivity and can identify slight turn-to-turn faults.

Description

Energy extraction reactor protection method and system based on phase comparison and amplitude comparison principle
Technical Field
The invention relates to the field of relay protection of electrical technology, in particular to a method and a system for protecting an energy extraction reactor based on a phase comparison and amplitude comparison principle.
Background
The energy-pumping shunt reactor provides reactive compensation for an ultrahigh-voltage and long-distance transmission network, and can also provide a safe, stable and efficient power supply for a switch station without power supply in remote areas. The working principle is that when the high-voltage parallel reactance compensation circuit is in capacitive reactive power, the energy-extracting winding is utilized to directly extract a part of energy from the reactor for lighting of a switch station and other domestic electricity, and the safe and stable operation of the parallel reactor cannot be influenced because the energy extracted by the energy-extracting winding is very small.
The turn-to-turn protection of the existing energy-extracting winding adopts the zero-sequence overcurrent criterion of the energy-extracting winding to match with the external blocking criterion to trip the roadside circuit breaker connected with the energy-extracting reactor through time delay action. Under the condition that an earth short circuit fault occurs outside the energy-extracting reactor, if the outside-area blocking criterion cannot reliably block the outside-area fault, the zero-sequence current of the energy-extracting winding is larger than a preset zero-sequence current setting value, and the duration time exceeds a fixed value of turn-to-turn protection time of the energy-extracting winding, the turn-to-turn protection misoperation of the energy-extracting winding is caused, and the safe and stable operation of the energy-extracting reactor is further influenced.
The turn-to-turn protection of the existing energy-pumping reactor has the problems of difficult setting and matching, insufficient sensitivity during turn-to-turn fault of the energy-pumping winding, misoperation risk during external fault and the like. In order to rapidly remove turn-to-turn faults of the energy-extracting winding, avoid the development of the turn-to-turn faults of the energy-extracting winding to damage the whole energy-extracting reactor, improve the protection reliability of the energy-extracting reactor and ensure the safe operation of the energy-extracting reactor, turn-to-turn protection of the energy-extracting winding must be configured for supplement.
Disclosure of Invention
The invention provides an energy extraction reactor protection method and system based on phase comparison and amplitude comparison principles, and aims to solve the problem of how to improve the protection reliability of an energy extraction reactor.
In order to solve the above problem, according to an aspect of the present invention, there is provided an energy extracting reactor protection method based on phase and amplitude comparison principle, the method comprising:
calculating the zero sequence current of the main reactance winding, the zero sequence current of the energy-extracting winding side, the zero sequence current break variable of the main reactance winding and the zero sequence current break variable of the energy-extracting winding side according to the acquired current transformer sampling values of the main reactance device side and the energy-extracting winding side of the energy-extracting reactor respectively;
short-circuiting the side of the energy extraction winding, applying a voltage with a preset voltage threshold value on any phase winding of the main reactor, respectively measuring the current amplitudes of the phase of the main reactor and the energy extraction winding side, and calculating a current change coefficient according to the current amplitudes of the phase of the main reactor and the energy extraction winding; wherein any phase is A, B or C phase;
judging whether the zero sequence current of the main reactance winding, the zero sequence current at the side of the energy extraction winding, the zero sequence current break variable of the main reactance winding, the zero sequence current break variable at the side of the energy extraction winding and the current change coefficient meet a phase comparison criterion or an arbitrary amplitude comparison criterion, and simultaneously meeting a differential threshold criterion, if so, performing protective action on the energy extraction reactor; and on the contrary, the energy-pumping reactor is protected from action.
Preferably, the calculating the zero sequence current of the main reactance winding, the zero sequence current of the energy-extracting winding side, the zero sequence current break variable of the main reactance winding and the zero sequence current break variable of the energy-extracting winding side according to the obtained current transformer sampling values of the main reactance winding side and the energy-extracting winding side of the energy-extracting reactor respectively includes:
Figure BDA0001815467690000021
Figure BDA0001815467690000022
Figure BDA0001815467690000023
Figure BDA0001815467690000024
wherein the content of the first and second substances,
Figure BDA0001815467690000025
zero sequence current of the main reactance winding;
Figure BDA0001815467690000026
zero sequence current at the side of the energy-pumping winding;
Figure BDA0001815467690000027
zero-sequence current break variable of the main reactance winding;
Figure BDA0001815467690000028
the zero sequence current break variable at the side of the energy-extracting winding is adopted;
Figure BDA0001815467690000029
and
Figure BDA00018154676900000210
respectively are the current phasor values of the main reactor side;
Figure BDA00018154676900000211
and
Figure BDA00018154676900000212
respectively are the current phasor values of the main reactor side; t is the period time of the fundamental wave signal.
Preferably, wherein the current change coefficient is calculated using the following formula:
Figure BDA00018154676900000213
wherein, KfIs the current variation coefficient;
Figure BDA0001815467690000031
the current amplitude of the main reactor in any phase;
Figure BDA0001815467690000032
the current amplitude of any phase of the energized winding.
Preferably, wherein
The phase comparison criterion is as follows:
Figure BDA0001815467690000033
the amplitude comparison criterion comprises:
the first amplitude criterion is as follows:
Figure BDA0001815467690000034
the second amplitude comparison criterion is as follows:
Figure BDA0001815467690000035
the differential threshold criterion is:
Figure BDA0001815467690000036
wherein the content of the first and second substances,
Figure BDA0001815467690000037
zero sequence current of the main reactance winding;
Figure BDA0001815467690000038
zero sequence current at the side of the energy-pumping winding;
Figure BDA0001815467690000039
zero-sequence current break variable of the main reactance winding;
Figure BDA00018154676900000310
the zero sequence current break variable at the side of the energy-extracting winding is adopted; kfIs the current variation coefficient; k is a radical ofset1The braking coefficient is the first amplitude criterion; k is a radical ofset2A braking coefficient of a second amplitude comparison criterion; i issetIs a predetermined differential constant.
According to another aspect of the present invention, there is provided an energy extraction reactor protection system based on the phase and amplitude comparison principle, the system comprising:
the zero sequence current and zero sequence current break variable calculation unit is used for calculating the zero sequence current of the main reactance winding, the zero sequence current of the energy extraction winding side, the zero sequence current break variable of the main reactance winding and the zero sequence current break variable of the energy extraction winding side according to the acquired current transformer sampling values of the main reactance side and the energy extraction winding side of the energy extraction reactance reactor respectively;
the current change coefficient calculation unit is used for short-circuiting the side of the energy extraction winding, applying a voltage with a preset voltage threshold value on any phase winding of the main reactor, respectively measuring the current amplitude of the phase of the main reactor and the energy extraction winding side, and calculating a current change coefficient according to the current amplitude of the phase of the main reactor and the energy extraction winding; wherein any phase is A, B or C phase;
the protection action unit is used for judging whether the zero sequence current of the main reactance winding, the zero sequence current at the side of the energy extraction winding, the zero sequence current break variable of the main reactance winding, the zero sequence current break variable at the side of the energy extraction winding and the current change coefficient meet a phase comparison criterion or any amplitude comparison criterion, and simultaneously meet a differential threshold criterion, if so, the energy extraction reactor performs protection action; and on the contrary, the energy-pumping reactor is protected from action.
Preferably, the zero sequence current and zero sequence current break variable calculating unit calculates the zero sequence current of the main reactance winding, the zero sequence current of the energy-extracting winding side, the zero sequence current break variable of the main reactance winding and the zero sequence current break variable of the energy-extracting winding side according to the obtained current transformer sampling values of the main reactance side and the energy-extracting winding side of the energy-extracting reactance reactor respectively, and includes:
Figure BDA0001815467690000041
Figure BDA0001815467690000042
Figure BDA0001815467690000043
Figure BDA0001815467690000044
wherein the content of the first and second substances,
Figure BDA0001815467690000045
zero sequence current of the main reactance winding;
Figure BDA0001815467690000046
zero sequence current at the side of the energy-pumping winding;
Figure BDA0001815467690000047
zero-sequence current break variable of the main reactance winding;
Figure BDA0001815467690000048
the zero sequence current break variable at the side of the energy-extracting winding is adopted;
Figure BDA0001815467690000049
and
Figure BDA00018154676900000410
respectively are the current phasor values of the main reactor side;
Figure BDA00018154676900000411
and
Figure BDA00018154676900000412
respectively are the current phasor values of the main reactor side; t is the period time of the fundamental wave signal.
Preferably, in the current change coefficient calculation unit, the current change coefficient is calculated using the following formula:
Figure BDA00018154676900000413
wherein, KfIs the current variation coefficient;
Figure BDA00018154676900000414
the current amplitude of the main reactor in any phase;
Figure BDA00018154676900000415
the current amplitude of any phase of the energized winding.
Preferably, wherein
The phase comparison criterion is as follows:
Figure BDA00018154676900000416
the amplitude comparison criterion comprises:
the first amplitude criterion is as follows:
Figure BDA00018154676900000417
the second amplitude comparison criterion is as follows:
Figure BDA00018154676900000418
the differential threshold criterion is:
Figure BDA00018154676900000419
wherein the content of the first and second substances,
Figure BDA00018154676900000420
zero sequence current of the main reactance winding;
Figure BDA00018154676900000421
zero sequence current at the side of the energy-pumping winding;
Figure BDA00018154676900000422
zero-sequence current break variable of the main reactance winding;
Figure BDA00018154676900000423
the zero sequence current break variable at the side of the energy-extracting winding is adopted; kfIs the current variation coefficient; k is a radical ofset1The braking coefficient is the first amplitude criterion; k is a radical ofset2A braking coefficient of a second amplitude comparison criterion; i issetIs a predetermined differential constant.
The invention provides a pumped-energy reactor protection method and system based on a phase comparison and amplitude comparison principle, which utilize the low coupling characteristic of a pumped-energy parallel reactor and form a pumped-energy reactor differential protection method based on the phase comparison principle and the amplitude comparison principle, wherein the pumped-energy reactor protection method is characterized in that whether the calculated zero-sequence current of a main reactance winding, the zero-sequence current of a pumped-energy winding side, the zero-sequence current break variable of the main reactance winding, the zero-sequence current break variable of the pumped-energy winding side and the current change coefficient meet the phase comparison criterion or any amplitude comparison criterion or not and simultaneously meet the differential threshold criterion to determine whether the pumped-energy reactor protection acts or not, and if so, the pumped-energy reactor protection acts; and on the contrary, the energy-pumping reactor is protected from action. The protection method of the energy-pumping reactor fully improves the reliability of the protection of the energy-pumping reactor; the energy pumping reactor is protected without voltage, and the protection can reliably act under the condition of PT disconnection; the protection of the energy-pumping reactor can simultaneously protect the turn-to-turn fault of the main reactance winding and the turn-to-turn fault of the energy-pumping winding and other faults with zero-sequence current, thereby avoiding the redundant configuration of the protection; the energy pumping reactor has high protection sensitivity and can identify slight turn-to-turn faults; the protection constant value of the energy extraction reactor does not need to be manually set, and the problem that the protection constant value of the existing energy extraction reactor is difficult to set is solved.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flow diagram of a method 100 for pump reactor protection based on phase and amplitude comparison principles according to an embodiment of the present invention;
FIG. 2 is a logic diagram of an energy extraction reactor protection criterion according to an embodiment of the invention;
FIG. 3 is a diagram of the results of differential protection of an out-of-range fault pump reactor according to an embodiment of the present invention;
FIG. 4 is a diagram of a primary reactor side A-phase 1% inter-turn fault protection result according to an embodiment of the invention;
FIG. 5 is a diagram of the results of 5% turn-to-turn fault protection for phase A on the pumped winding side according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an energy extraction reactor protection system 600 based on phase and amplitude comparison principles according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow chart of a pump reactor protection method 100 based on phase and amplitude comparison principles according to an embodiment of the present invention. As shown in fig. 1, the method for protecting an energy-pumping reactor based on the phase comparison and amplitude comparison principles according to the embodiment of the present invention utilizes the low coupling characteristic of the energy-pumping parallel reactor, and forms an energy-pumping reactor differential protection method based on the phase comparison principle and the amplitude comparison principle, and determines whether the protection of the energy-pumping reactor is performed by determining whether the calculated zero-sequence current of the main reactance winding, the zero-sequence current of the energy-pumping winding side, the zero-sequence current break variable of the main reactance winding, the zero-sequence current break variable of the energy-pumping winding side, and the current change coefficient satisfy the phase comparison criterion or any amplitude comparison criterion, and simultaneously satisfy the differential threshold criterion, and if so, perform the protection of the energy-pumping reactor; and on the contrary, the energy-pumping reactor is protected from action. The energy extraction reactor protection method provided by the embodiment of the invention fully improves the protection reliability of the energy extraction reactor; the energy pumping reactor is protected without voltage, and the protection can reliably act under the condition of PT disconnection; the protection of the energy-pumping reactor can simultaneously protect the turn-to-turn fault of the main reactance winding and the turn-to-turn fault of the energy-pumping winding and other faults with zero-sequence current, thereby avoiding the redundant configuration of the protection; the energy pumping reactor has high protection sensitivity and can identify slight turn-to-turn faults; the protection constant value of the energy extraction reactor does not need to be manually set, and the problem that the protection constant value of the existing energy extraction reactor is difficult to set is solved. The method 100 for protecting an energy-pumping reactor based on the phase comparison and amplitude comparison principle starts from step 101, and calculates the zero sequence current of a main reactance winding, the zero sequence current of an energy-pumping winding side, the zero sequence current break variable of the main reactance winding and the zero sequence current break variable of the energy-pumping winding side according to the acquired current transformer sampling values of the main reactance side and the energy-pumping winding side of the energy-pumping reactor in step 101.
Preferably, the calculating the zero sequence current of the main reactance winding, the zero sequence current of the energy-extracting winding side, the zero sequence current break variable of the main reactance winding and the zero sequence current break variable of the energy-extracting winding side according to the obtained current transformer sampling values of the main reactance winding side and the energy-extracting winding side of the energy-extracting reactor respectively includes:
Figure BDA0001815467690000061
Figure BDA0001815467690000062
Figure BDA0001815467690000071
Figure BDA0001815467690000072
wherein the content of the first and second substances,
Figure BDA0001815467690000073
zero sequence current of the main reactance winding;
Figure BDA0001815467690000074
for extracting zero-sequence current on the side of the energy winding；
Figure BDA0001815467690000075
Zero-sequence current break variable of the main reactance winding;
Figure BDA0001815467690000076
the zero sequence current break variable at the side of the energy-extracting winding is adopted;
Figure BDA0001815467690000077
and
Figure BDA0001815467690000078
respectively are the current phasor values of the main reactor side;
Figure BDA0001815467690000079
and
Figure BDA00018154676900000710
respectively are the current phasor values of the main reactor side; t is the period time of the fundamental wave signal.
Preferably, in step 102, the side of the energy-extracting winding is short-circuited, a voltage with a preset voltage threshold is applied to any phase winding of the main reactor, the current amplitudes of the phase on the side of the main reactor and the energy-extracting winding are measured respectively, and a current change coefficient is calculated according to the current amplitudes of the phase of the main reactor and the energy-extracting winding; wherein any phase is A, B or C phase.
Preferably, wherein the current change coefficient is calculated using the following formula:
Figure BDA00018154676900000711
wherein, KfIs the current variation coefficient;
Figure BDA00018154676900000712
the current amplitude of the main reactor in any phase;
Figure BDA00018154676900000713
the current amplitude of any phase of the energized winding.
Preferably, in step 103, it is determined whether the zero sequence current of the main reactance winding, the zero sequence current on the side of the energy extraction winding, the zero sequence current break variable of the main reactance winding, the zero sequence current break variable on the side of the energy extraction winding and the current change coefficient satisfy a phase comparison criterion or an arbitrary amplitude comparison criterion, and simultaneously satisfy a differential threshold criterion, if so, the energy extraction reactor performs a protection action; and on the contrary, the energy-pumping reactor is protected from action.
Preferably, wherein
The phase comparison criterion is as follows:
Figure BDA00018154676900000714
the amplitude comparison criterion comprises:
the first amplitude criterion is as follows:
Figure BDA00018154676900000715
the second amplitude comparison criterion is as follows:
Figure BDA00018154676900000716
the differential threshold criterion is:
Figure BDA00018154676900000717
wherein the content of the first and second substances,
Figure BDA00018154676900000718
zero sequence current of the main reactance winding;
Figure BDA00018154676900000719
zero sequence current at the side of the energy-pumping winding;
Figure BDA00018154676900000720
zero-sequence current break variable of the main reactance winding;
Figure BDA00018154676900000721
the zero sequence current break variable at the side of the energy-extracting winding is adopted; kfIs the current variation coefficient; k is a radical ofset1The braking coefficient is the first amplitude criterion; k is a radical ofset2A braking coefficient of a second amplitude comparison criterion; i issetIs a predetermined differential constant.
Fig. 2 is a logic diagram of the protection criterion of the energy extracting reactor according to the embodiment of the invention. As shown in fig. 2, the phase comparison criterion, the first amplitude comparison criterion and the second amplitude comparison criterion are subjected to and gate judgment with the differential threshold criterion after passing through an or gate, and if yes, the pumping reactor performs protection action; and on the contrary, the energy-pumping reactor is protected from action.
In the embodiment of the invention, firstly, a sampling value i is obtained according to a current transformer on the main reactor side of the energy-extracting reactorA1、iB1And iC1Calculating the current phasor value of the main reactor side
Figure BDA0001815467690000081
And
Figure BDA0001815467690000082
according to the sampling value i of the current transformer at the side of the energy-extracting windinga2、ib2And ic2Calculating the current phasor value of the main reactor side
Figure BDA0001815467690000083
And
Figure BDA0001815467690000084
then, the zero sequence current of the main reactance winding is calculated as:
Figure BDA0001815467690000085
the zero-sequence current at the side of the energy-extracting winding is as follows:
Figure BDA0001815467690000086
the zero sequence current break variable of the main reactance winding is as follows:
Figure BDA0001815467690000087
on the side of the energy-extracting windingThe zero-sequence current break variable is as follows:
Figure BDA0001815467690000088
wherein, T is the period time of the fundamental wave signal.
Then, the side of the energy-extracting winding is short-circuited, and a voltage U is applied to the phase A winding of the main reactorAXMeasuring the current amplitude I of the A phase of the main reactorAAnd the current amplitude I of the A phase of the energy-extracting windingaAnd calculating a current change coefficient
Figure BDA0001815467690000089
Finally, the zero sequence current of the main reactance winding is judged
Figure BDA00018154676900000810
Zero sequence current on the side of the energy-extracting winding
Figure BDA00018154676900000811
Zero sequence current step change of main reactance winding
Figure BDA00018154676900000812
Zero sequence current sudden change on the side of the energy-extracting winding
Figure BDA00018154676900000813
And coefficient of variation of current KfWhether the comparison criterion or any comparison criterion is met and the differential threshold criterion is met at the same time, if so, the energy-pumping reactor is taken out to perform protection action; and on the contrary, the energy-pumping reactor is protected from action. Wherein, the phase comparison criterion is as follows:
Figure BDA00018154676900000814
the amplitude comparison criterion comprises the following steps: the first amplitude criterion is as follows:
Figure BDA00018154676900000815
the second amplitude comparison criterion is as follows:
Figure BDA00018154676900000816
the differential threshold criterion is:
Figure BDA00018154676900000817
kset1the braking coefficient, k, being a first amplitude criterionset1＝4；kset2Braking coefficient, k, for a second amplitude criterionset2＝6；IsetIs a predetermined differential constant.
Fig. 3 is a diagram of the results of differential protection of an out-of-range fault pump reactor according to an embodiment of the invention. As shown in fig. 3, phase-comparison criterion, first amplitude-comparison criterion (amplitude-comparison criterion 1) and second amplitude-comparison criterion 2 (amplitude-comparison criterion 2) of the phase-to-phase metallic ground fault of the bus a outside the generation area of the energy-extracting reactor are not met, and the phase-comparison criterion and the amplitude-comparison criterion result is and-gated with the differential criterion, so that the protection action condition of the energy-extracting reactor is not met, and the protection is reliable and does not act.
Fig. 4 is a diagram of a main reactor side a-phase 1% inter-turn fault protection result according to an embodiment of the invention. As shown in fig. 4, when a 1% turn-to-turn fault of the side a phase of the main reactor occurs in the energy-extracting reactor, the phase comparison criterion and the differential threshold criterion are satisfied, and the energy-extracting reactor is protected to operate reliably.
Fig. 5 is a diagram of the results of 5% turn-to-turn fault protection for the a phase on the pumped winding side according to the embodiment of the invention. As shown in fig. 5, when the energy extraction reactor has an a-phase 5% turn-to-turn fault on the energy extraction side, the first amplitude criterion and the differential threshold criterion are satisfied, and the energy extraction reactor is protected to operate reliably.
Fig. 6 is a schematic structural diagram of an energy extraction reactor protection system 600 based on phase and amplitude comparison principles according to an embodiment of the present invention. As shown in fig. 6, an embodiment of the present invention provides an energy extraction reactor protection system 600 based on phase ratio and amplitude ratio principle, including: a zero sequence current and zero sequence current break variable calculation unit 601, a current change coefficient calculation unit 602 and a protection action unit 603.
Preferably, the zero sequence current and zero sequence current mutation amount calculating unit 601 is configured to calculate a zero sequence current of the main reactance winding, a zero sequence current of the energy-extracting winding, a zero sequence current mutation amount of the main reactance winding, and a zero sequence current mutation amount of the energy-extracting winding according to the obtained current transformer sampling values of the main reactance side and the energy-extracting winding side of the energy-extracting reactor, respectively.
Preferably, the zero sequence current and zero sequence current break variable calculating unit 601, which calculates the zero sequence current of the main reactance winding, the zero sequence current of the energy-extracting winding, the zero sequence current break variable of the main reactance winding, and the zero sequence current break variable of the energy-extracting winding according to the obtained current transformer sampling values of the main reactance side and the energy-extracting winding side of the energy-extracting reactor respectively, includes:
Figure BDA0001815467690000091
Figure BDA0001815467690000092
Figure BDA0001815467690000093
Figure BDA0001815467690000094
wherein the content of the first and second substances,
Figure BDA0001815467690000095
zero sequence current of the main reactance winding;
Figure BDA0001815467690000096
zero sequence current at the side of the energy-pumping winding;
Figure BDA0001815467690000097
zero-sequence current break variable of the main reactance winding;
Figure BDA0001815467690000098
the zero sequence current break variable at the side of the energy-extracting winding is adopted;
Figure BDA0001815467690000099
and
Figure BDA00018154676900000910
respectively are the current phasor values of the main reactor side;
Figure BDA00018154676900000911
and
Figure BDA00018154676900000912
respectively are the current phasor values of the main reactor side; t is the period time of the fundamental wave signal.
Preferably, the current variation coefficient calculation unit 602 is configured to short-circuit the side of the energy extraction winding, apply a voltage with a preset voltage threshold to any phase winding of the main reactor, measure current amplitudes of the phase on the side of the main reactor and the energy extraction winding, respectively, and calculate a current variation coefficient according to the current amplitudes of the phase of the main reactor and the energy extraction winding; wherein any phase is A, B or C phase.
Preferably, in the current variation coefficient calculating unit 602, the current variation coefficient is calculated by using the following formula:
Figure BDA0001815467690000101
wherein, KfIs the current variation coefficient;
Figure BDA0001815467690000102
the current amplitude of the main reactor in any phase;
Figure BDA0001815467690000103
the current amplitude of any phase of the energized winding.
Preferably, the protection action unit 603 is configured to determine whether the zero-sequence current of the main reactance winding, the zero-sequence current at the side of the energy extraction winding, the zero-sequence current break variable of the main reactance winding, the zero-sequence current break variable at the side of the energy extraction winding, and the current variation coefficient satisfy a phase comparison criterion or an arbitrary amplitude comparison criterion, and simultaneously satisfy a differential threshold criterion, and if so, perform a protection action on the energy extraction reactor; and on the contrary, the energy-pumping reactor is protected from action.
Preferably, wherein the phase ratio criterion is:
Figure BDA0001815467690000104
the amplitude comparison criterion comprises:
the first amplitude criterion is as follows:
Figure BDA0001815467690000105
the second amplitude comparison criterion is as follows:
Figure BDA0001815467690000106
the differential threshold criterion is:
Figure BDA0001815467690000107
wherein the content of the first and second substances,
Figure BDA0001815467690000108
zero sequence current of the main reactance winding;
Figure BDA0001815467690000109
zero sequence current at the side of the energy-pumping winding;
Figure BDA00018154676900001010
zero-sequence current break variable of the main reactance winding;
Figure BDA00018154676900001011
the zero sequence current break variable at the side of the energy-extracting winding is adopted; kfIs the current variation coefficient; k is a radical ofset1The braking coefficient is the first amplitude criterion; k is a radical ofset2A braking coefficient of a second amplitude comparison criterion; i issetIs a predetermined differential constant.
The pump reactor protection system 600 based on the phase comparison and amplitude comparison principle according to the embodiment of the present invention corresponds to the pump reactor protection method 100 based on the phase comparison and amplitude comparison principle according to another embodiment of the present invention, and is not described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

Claims (2)

1. A method for protecting an energy extraction reactor based on phase comparison and amplitude comparison principles is characterized by comprising the following steps:
calculating the zero sequence current of the main reactance winding, the zero sequence current of the energy-extracting winding side, the zero sequence current break variable of the main reactance winding and the zero sequence current break variable of the energy-extracting winding side according to the acquired current transformer sampling values of the main reactance device side and the energy-extracting winding side of the energy-extracting reactor respectively;
short-circuiting the side of the energy extraction winding, applying a voltage with a preset voltage threshold value on any phase winding of the main reactor, respectively measuring the current amplitudes of the phase of the main reactor and the energy extraction winding side, and calculating a current change coefficient according to the current amplitudes of the phase of the main reactor and the energy extraction winding; wherein any phase is A, B or C phase;
judging whether the zero sequence current of the main reactance winding, the zero sequence current at the side of the energy extraction winding, the zero sequence current break variable of the main reactance winding, the zero sequence current break variable at the side of the energy extraction winding and the current change coefficient meet a phase comparison criterion or an arbitrary amplitude comparison criterion, and simultaneously meeting a differential threshold criterion, if so, performing protective action on the energy extraction reactor; on the contrary, the energy pumping reactor is protected from action;
wherein, the zero sequence current of the main reactance winding, the zero sequence current of the energy-pumping winding side, the zero sequence current break variable of the main reactance winding and the zero sequence current break variable of the energy-pumping winding side are calculated according to the acquired current transformer sampling values of the main reactance side and the energy-pumping winding side of the energy-pumping reactor respectively, and the method comprises the following steps:
Figure FDA0003479982730000011
Figure FDA0003479982730000012
Figure FDA0003479982730000013
Figure FDA0003479982730000014
wherein the content of the first and second substances,
Figure FDA0003479982730000015
zero sequence current of the main reactance winding;
Figure FDA0003479982730000016
zero sequence current at the side of the energy-pumping winding;
Figure FDA0003479982730000017
zero-sequence current break variable of the main reactance winding;
Figure FDA0003479982730000018
the zero sequence current break variable at the side of the energy-extracting winding is adopted;
Figure FDA0003479982730000019
and
Figure FDA00034799827300000110
respectively the current phasor value of the main reactor side；
Figure FDA00034799827300000111
And
Figure FDA00034799827300000112
respectively are current phasor values of the energy extraction winding side; t is the period time of the fundamental wave signal;
the current change coefficient was calculated using the following formula:
Figure FDA00034799827300000113
wherein, KfIs the current variation coefficient;
Figure FDA0003479982730000021
the current amplitude of the main reactor in any phase;
Figure FDA0003479982730000022
the current amplitude of any phase of the energy-extracting winding is obtained;
the phase comparison criterion is as follows:
Figure FDA0003479982730000023
the amplitude comparison criterion comprises:
the first amplitude criterion is as follows:
Figure FDA0003479982730000024
the second amplitude comparison criterion is as follows:
Figure FDA0003479982730000025
the differential threshold criterion is:
Figure FDA0003479982730000026
wherein the content of the first and second substances,
Figure FDA0003479982730000027
zero sequence current of the main reactance winding;
Figure FDA0003479982730000028
zero sequence current at the side of the energy-pumping winding;
Figure FDA0003479982730000029
zero-sequence current break variable of the main reactance winding;
Figure FDA00034799827300000210
the zero sequence current break variable at the side of the energy-extracting winding is adopted; kfIs the current variation coefficient; k is a radical ofset1The braking coefficient, k, being a first amplitude criterionset1＝4；kset2Braking coefficient, k, for a second amplitude criterionset2＝6；IsetIs a predetermined differential constant.
2. An energy extraction reactor protection system based on phase and amplitude comparison principles, the system comprising:
the zero sequence current and zero sequence current break variable calculation unit is used for calculating the zero sequence current of the main reactance winding, the zero sequence current of the energy extraction winding side, the zero sequence current break variable of the main reactance winding and the zero sequence current break variable of the energy extraction winding side according to the acquired current transformer sampling values of the main reactance side and the energy extraction winding side of the energy extraction reactance reactor respectively;
the current change coefficient calculation unit is used for short-circuiting the side of the energy extraction winding, applying a voltage with a preset voltage threshold value on any phase winding of the main reactor, respectively measuring the current amplitude of the phase of the main reactor and the energy extraction winding side, and calculating a current change coefficient according to the current amplitude of the phase of the main reactor and the energy extraction winding; wherein any phase is A, B or C phase;
the protection action unit is used for judging whether the zero sequence current of the main reactance winding, the zero sequence current at the side of the energy extraction winding, the zero sequence current break variable of the main reactance winding, the zero sequence current break variable at the side of the energy extraction winding and the current change coefficient meet a phase comparison criterion or any amplitude comparison criterion, and simultaneously meet a differential threshold criterion, if so, the energy extraction reactor performs protection action; on the contrary, the energy pumping reactor is protected from action;
the zero sequence current and zero sequence current break variable calculation unit calculates the zero sequence current of the main reactance winding, the zero sequence current of the energy extraction winding side, the zero sequence current break variable of the main reactance winding and the zero sequence current break variable of the energy extraction winding side according to the acquired current transformer sampling values of the main reactance device side and the energy extraction winding side of the energy extraction reactor respectively, and the zero sequence current and zero sequence current break variable calculation unit comprises:
Figure FDA0003479982730000031
Figure FDA0003479982730000032
Figure FDA0003479982730000033
Figure FDA0003479982730000034
wherein the content of the first and second substances,
Figure FDA0003479982730000035
zero sequence current of the main reactance winding;
Figure FDA0003479982730000036
zero sequence current at the side of the energy-pumping winding;
Figure FDA0003479982730000037
zero-sequence current break variable of the main reactance winding;
Figure FDA0003479982730000038
the zero sequence current break variable at the side of the energy-extracting winding is adopted;
Figure FDA0003479982730000039
and
Figure FDA00034799827300000310
respectively are the current phasor values of the main reactor side;
Figure FDA00034799827300000311
and
Figure FDA00034799827300000312
respectively are current phasor values of the energy extraction winding side; t is the period time of the fundamental wave signal;
in the current change coefficient calculation unit, a current change coefficient is calculated using the following formula:
Figure FDA00034799827300000313
wherein, KfIs the current variation coefficient;
Figure FDA00034799827300000314
the current amplitude of the main reactor in any phase;
Figure FDA00034799827300000315
the current amplitude of any phase of the energy-extracting winding is obtained;
the phase comparison criterion is as follows:
Figure FDA00034799827300000316
the amplitude comparison criterion comprises:
the first amplitude criterion is as follows:
Figure FDA00034799827300000317
the second amplitude comparison criterion is as follows:
Figure FDA00034799827300000318
the differential threshold criterion is:
Figure FDA00034799827300000319
wherein the content of the first and second substances,
Figure FDA00034799827300000320
zero sequence current of the main reactance winding;
Figure FDA00034799827300000321
zero sequence current at the side of the energy-pumping winding;
Figure FDA00034799827300000322
zero-sequence current break variable of the main reactance winding;
Figure FDA00034799827300000323
the zero sequence current break variable at the side of the energy-extracting winding is adopted; kfIs the current variation coefficient; k is a radical ofset1The braking coefficient, k, being a first amplitude criterionset1＝4；kset2Braking coefficient, k, for a second amplitude criterionset2＝6；IsetIs a predetermined differential constant.
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