CN114068160A - Transformer voltage loss protection judgment method with phase loss function - Google Patents
Transformer voltage loss protection judgment method with phase loss function Download PDFInfo
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Abstract
The invention provides a method for judging the voltage loss protection of a transformer with a phase loss function, which combines the transformer principle and RTDS simulation test data and comprises the following steps of 1: simulating a power supply mode of a traction substation through a real-time data simulation system (RTDS), and modeling a transformer wiring mode; step 2: testing the changes of line voltages and phase voltages of the high-voltage side and the low-voltage side of the transformer when the A, B, C three-phase voltages of the high-voltage side of the transformer are respectively in phase loss; and step 3: the method combines the transformer principle and the data obtained in the step 2 to derive the judgment condition of the transformer voltage loss protection with the phase loss function, lists the change of the voltage at the high-voltage side and the influence on the voltage at the low-voltage side when a plurality of transformers have phase loss, thereby judging whether the transformers have phase loss according to the voltages at the high-voltage side and the low-voltage side of the transformers, solving the defect that the conventional voltage loss protection can not judge the phase loss and the voltage loss, and avoiding the adverse influence on the whole power supply line caused by the fault operation of the transformers.
Description
Technical Field
The invention relates to the field of traction power supply systems of electrified railways, in particular to a method for judging the voltage loss protection of a transformer with a phase loss function based on an RTDS simulation test.
Background
At present, the existing domestic electrified railways generally only judge the condition of voltage loss of three phases of a transformer for voltage loss protection, but basically do not consider the condition of voltage loss of a single phase of an incoming line, so that the conventional voltage loss protection does not act when the transformer is out of phase, and then spare power automatic switching action is not generated, and the power supply arm of the corresponding phase can be powered off actually, and the hazards of no voltage of a contact network, parking and the like are caused. In order to improve the operation reliability of a traction power supply system and avoid the condition that a power supply arm is interrupted in power supply due to the fact that the transformer is not operated under the condition of voltage loss of an incoming line single phase, and further the operation safety of a railway is influenced, it is necessary to further upgrade the voltage loss protection operation judgment logic, bring the phase loss protection into one type of the voltage loss protection, start a spare power automatic switching program after the phase loss occurs, and ensure the safe operation of the power supply system. Meanwhile, different types of transformers are considered, so that the expression forms of voltage changes after phase failure are different, different types of transformers need to be distinguished, and a specific method for judging the voltage loss protection of the transformer with the phase failure function is provided.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for judging the voltage loss protection of the transformer with the phase loss function based on an RTDS simulation test. The method simulates the power supply mode of a traction substation through a real-time data simulation system, and models various transformer wiring modes respectively. The expression forms of voltage changes after phase failure are different due to different transformer types, in order to comprehensively test as much as possible, seven common transformer types are selected, namely Vv, Vx, Ii, Iii, YNd11, Ynv and SCOTT, and when phase failure occurs to A, B, C three-phase voltage on a high-voltage side respectively under different transformer types, the changes of line voltage and phase voltage on the high-voltage side and a low-voltage side of the transformer are tested, and the judgment condition of the transformer voltage loss protection with the phase failure function is deduced by combining the transformer principle and test data, so that the voltage loss protection logic is optimized, and the reliability of the operation of a traction power supply system is improved.
In order to solve the problems, the technical scheme adopted by the invention is as follows: a method for judging the voltage loss protection of a transformer with a phase loss function is characterized by comprising the following steps:
step 1: simulating a power supply mode of a traction substation through a real-time data simulation system (RTDS), and modeling a transformer wiring mode;
step 2: testing the changes of line voltages and phase voltages of the high-voltage side and the low-voltage side of the transformer when the A, B, C three-phase voltages of the high-voltage side of the transformer are respectively in phase loss;
and step 3: and (3) deducing the judgment condition of the transformer voltage loss protection with the phase loss function by combining the transformer principle and the data obtained in the step (2).
Further, the different types of the transformers may cause different conditions for determining the voltage loss under the corresponding phase loss condition, and the transformers may be Vv transformers, Vx transformers, Ii transformers, Iii transformers, YNd11 transformers, YNv transformers and SCOTT transformers.
Further, when the Vv transformer
When phase A is in phase failure: the voltage drop of the UAB line at the high-voltage side is 0V, and the voltage drop of the Ua phase at the low-voltage side is 0V;
when phase B lacks phase: the voltage of the UAB and UBC line on the high-voltage side is reduced by half, and the voltage of the Ua and Ub line on the low-voltage side is reduced by half;
and C phase loss: the voltage drop of the UBC line at the high-voltage side is 0V, and the voltage drop of the Ub phase at the low-voltage side is 0V;
therefore, the voltage loss judgment conditions of the Vv transformer in the phase loss of A, B, C are derived as follows:
(1) max { UAB, Ua } < UQX, and min { UBC, UCA, Ub } > UYY;
(2) min { UAB, UBC, Ua, Ub } > U1, and max { UAB, UBC, Ua, Ub } < U2, and UCA > UYY;
(3) max { UBC, Ub } < UQX, and min { UAB, UCA, Ua } > UYY;
the above three conditions are satisfied with one condition at will.
UCA is high-voltage side line voltage, UQX indicates a default phase voltage loss fixed value, UYY indicates a line voltage fixed value, U1 and U2 respectively indicate voltage fixed values lower than one half of rated voltage and higher than one half of rated voltage, and a floating interval is formed;
when the Vx transformer
When phase A is in phase failure: the voltage drop of the UAB line at the high-voltage side is 0V, and the voltage drop of the UT1 phase and the UF1 phase at the low-voltage side is 0V;
when phase B lacks phase: voltage of the UAB and UBC lines on the high-voltage side is reduced by half, and voltage of the UT1, UF1, UT2 and UF2 on the low-voltage side is reduced by half;
and C phase loss: the voltage drop of the high-voltage side UBC line is 0V, and the voltage drop of the low-voltage side UT2 and UF2 phases is 0V;
therefore, the conditions for judging the voltage loss of the Vx transformer when the phase is A, B, C default are derived as follows:
(1) max { UAB, UT1, UF1} < UQX, and min { UBC, UCA, UT2, UF2} > UYY;
(2) min { UAB, UBC, UT1, UF1, UT2, UF2} > U1, and max { UAB, UBC, UT1, UF1, UT2, UF2} < U2, and UCA > UYY;
(3) max { UBC, UT2, UF2} < UQX, and min { UAB, UCA, UT1, UF1} > UYY;
UCA is high-voltage side line voltage, UQX indicates a default phase voltage loss fixed value, UYY indicates a line voltage fixed value, U1 and U2 respectively indicate voltage fixed values lower than one half of rated voltage and higher than one half of rated voltage, and a floating interval is formed;
the above three conditions are satisfied with one condition at will.
The transformer voltage loss judgment condition under the phase loss condition provided by the invention can realize the upgraded transformer voltage loss protection function with phase loss judgment by combining the conventional voltage loss protection criterion max { UAB, UBC, UCA, Ua, Ub } < USY.
In the step 1, in an RTDS simulation test, when a transformer type is modeled, a common high-voltage side B phase is adopted as a common phase for a transformer with a common phase, and when the common phase is a C phase, only corresponding adjustment is needed to be carried out on B, C phases, so that a voltage loss judgment condition when the common phase is the C phase can be obtained.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention discloses an upgraded voltage loss protection action judgment logic, which brings the phase loss protection into one type of voltage loss protection, and starts a spare power automatic switching program after the phase loss occurs, so as to ensure the safe operation of a power supply system. Meanwhile, different types of transformers are considered, so that the expression forms of voltage changes after phase failure are different, different types of transformers need to be distinguished, and a specific method for judging the voltage loss protection of the transformer with the phase failure function is provided.
2. The invention lists the change of the voltage at the high-voltage side and the influence on the voltage at the low-voltage side when a plurality of transformers have phase loss, thereby judging whether the transformers have phase loss or not according to the voltages at the high-voltage side and the low-voltage side of the transformers, solving the defect that the conventional voltage loss protection cannot judge the phase loss and the voltage loss, and avoiding the adverse effect on the whole power supply line caused by the faulty operation of the transformers.
Drawings
FIG. 1 is a schematic diagram of the Vv transformer bank wiring in the embodiment;
FIG. 2 is a logic block diagram of the voltage loss protection with phase loss function of the Vv transformer in the embodiment;
FIG. 3 is a flow chart of the embodiment of the method for deriving the default phase criterion of the transformer by using the simulation system;
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples of the specification.
As shown in fig. 3, the present embodiment discloses a method for determining voltage loss protection of a transformer with a phase loss function, which includes the following steps:
step 1: simulating a power supply mode of a traction substation through a real-time data simulation system (RTDS) to model the type of the transformer;
step 2: testing the changes of line voltages and phase voltages of the high-voltage side and the low-voltage side of the transformer when the A, B, C three-phase voltages of the high-voltage side of the transformer are respectively in phase loss;
and step 3: and (3) deducing the judgment condition of the transformer voltage loss protection with the phase loss function by combining the transformer principle and the data obtained in the step (2).
The different types of the transformers can cause different conditions for judging the voltage loss under the corresponding phase loss condition, and the following 7 types of transformers are selected for testing in the embodiment: vv transformers, Vx transformers, Ii transformers, Iii transformers, YNd11 transformers, YNv transformers, and SCOTT transformers.
In RTDS simulation test data, recorded voltage values are secondary values, and the voltage rated voltage of a high-voltage side line is set to be 100V and the voltage rated voltage of a low-voltage side phase is set to be 100V during modeling.
1. Voltage loss criterion for Vv transformer phase loss
When phase A is in phase failure: the voltage drop of the UAB line at the high-voltage side is about 0V, and the voltage drop of the Ua phase at the low-voltage side is about 0V.
When phase B lacks phase: the voltage of the UAB and UBC lines on the high-voltage side is reduced by half to about 50V, and the voltage of the Ua and Ub lines on the low-voltage side is reduced by half to about 50V.
And C phase loss: the voltage drop of the high-voltage side UBC line is about 0V, and the voltage drop of the low-voltage side Ub phase is about 0V.
Referring to the Vv transformer bank wiring diagram in fig. 1, it can be seen that phase loss of the high-voltage side a causes phase loss of the low-voltage side a, and phase loss of the high-voltage side C causes phase loss of the low-voltage side b, which is consistent with theoretical speculation.
Therefore, the voltage loss criterion when the Vv transformer is out of phase is deduced as follows:
a) max { UAB, Ua } < UQX, and min { UBC, UCA, Ub } > UYY;
b) min { UAB, UBC, Ua, Ub } > U1, and max { UAB, UBC, Ua, Ub } < U2, and UCA > UYY;
c) max { UBC, Ub } < UQX, and min { UAB, UCA, Ua } > UYY.
The transformer voltage loss under the phase-lack condition can be judged by randomly meeting one of the three conditions, and the upgraded transformer voltage loss protection function with the phase-lack judgment can be realized by integrating the conventional voltage loss criterion max { UAB, UBC, UCA, Ua, Ub } < USY, and the protection logic block diagram is shown in figure 2. Wherein USY indicates a voltage loss protection fixed value, UQX indicates a phase loss voltage loss fixed value, UYY indicates a line voltage fixed value, and U1 and U2 respectively indicate voltage fixed values lower than 50V and higher than 50V, so that a floating interval is formed. The same applies below. 2. Voltage loss criterion for phase loss of Vx transformer
When phase A is in phase failure: the voltage drop at the UAB line on the high-voltage side is about 0V, and the voltage drop at the UT1 and UF1 phases on the low-voltage side is about 0V.
When phase B lacks phase: the voltage of the high-voltage side UAB and UBC is reduced by half to about 50V, and the voltage of the low-voltage side UT1, UF1, UT2 and UF2 is reduced by half to about 50V.
And C phase loss: the voltage drop at the high-voltage side UBC line is about 0V, and the voltage drop at the low-voltage side UT2 and UF2 phases is about 0V.
Therefore, the voltage loss criterion when the Vx transformer is out of phase is deduced as follows:
a) max { UAB, UT1, UF1} < UQX, and min { UBC, UCA, UT2, UF2} > UYY;
b) min { UAB, UBC, UT1, UF1, UT2, UF2} > U1, and max { UAB, UBC, UT1, UF1, UT2, UF2} < U2, and UCA > UYY;
c) max { UBC, UT2, UF2} < UQX, and min { UAB, UCA, UT1, UF1} > UYY.
3. Voltage loss criterion for phase loss of Ii transformer
When phase A is in phase failure: the voltage drop of the UAB line at the high-voltage side is about 0V, and the voltage drop of the Ua phase at the low-voltage side is about 0V.
When phase B lacks phase: the voltage of the UAB line on the high-voltage side is reduced by half to about 50V, and the voltage of the Ua line on the low-voltage side is reduced by half to about 50V.
Therefore, the voltage loss criterion when the Ii transformer is out of phase is deduced as follows:
a)max{UAB、Ua}<UQX；
b) min { UAB, Ua } > U1, and max { UAB, Ua } < U2.
4. Iii criterion for voltage loss when phase loss of transformer
When phase A is in phase failure: the voltage drop at the UAB line on the high-voltage side is about 0V, and the voltage drop at the UT1 and UF1 phases on the low-voltage side is about 0V.
When phase B lacks phase: the voltage of the high-voltage side UAB line is reduced by about half to 50V, and the voltage of the low-voltage sides UT1 and UF1 is reduced by about half to 50V.
Therefore, the voltage loss criterion when the phase of the transformer is lost is derived from Iii:
a)max{UAB、UT1、UF1}<UQX；
b) min { UAB, UT1, UF1} > U1, and max { UAB, UT1, UF1} < U2.
5. Voltage loss criterion for phase loss of YNd11 transformer
When phase A is in phase failure: the voltages of the high-side UAB and UCA lines drop by about half to 50V, the voltage of the low-side Ua phase drops to about 0V, and the voltage of the low-side Ub phase drops to about V3/2, which is about 87V.
When phase B lacks phase: the voltages of the UAB and UBC on the high-voltage side are reduced by half to about 50V, and the voltages of the Ua and Ub phases on the low-voltage side are reduced to about V3/2 which is about 87V.
And C phase loss: the voltages of the high-side UBC and UCA lines are reduced by about half to 50V, the voltage of the low-side Ua phase is reduced to about V3/2, about 87V, and the voltage of the low-side Ub phase is reduced to about 0V.
Therefore, the voltage loss criterion when the YNd11 transformer is out of phase is deduced as follows:
a) min { UAB, UCA } > U1, and max { UAB, UCA } < U2, and UBC > UYY, and Ua < UQX, and Ub > U3, and Ub < U4;
b) min { UAB, UBC } > U1, and max { UAB, UBC } < U2, and UCA > UYY, and min { Ua, Ub } > U3, and max { Ua, Ub } < U4;
c) min { UBC, UCA } > U1, and max { UBC, UCA } < U2, and UAB > UYY, and Ub < UQX, and Ua > U3, and Ua < U4.
Wherein, U3, U4 indicate the voltage constant value that is less than 87V and is higher than 87V respectively, constitute a floating interval. The same applies below.
6. YNv criterion for voltage loss when phase loss of transformer
When phase A is in phase failure: the voltages of the high-side UAB and UCA lines drop by about half to 50V, the voltage of the low-side Ua phase drops to about 0V, and the voltage of the low-side Ub phase drops to about V3/2, which is about 87V.
When phase B lacks phase: the voltages of the UAB and UBC on the high-voltage side are reduced by half to about 50V, and the voltages of the Ua and Ub phases on the low-voltage side are reduced to about V3/2 which is about 87V.
And C phase loss: the voltages of the high-side UBC and UCA lines are reduced by about half to 50V, the voltage of the low-side Ua phase is reduced to about V3/2, about 87V, and the voltage of the low-side Ub phase is reduced to about 0V.
Therefore, the voltage loss criterion when the phase of the transformer is lost is derived from YNv:
a) min { UAB, UCA } > U1, and max { UAB, UCA } < U2, and UBC > UYY, and Ua < UQX, and Ub > U3, and Ub < U4;
b) min { UAB, UBC } > U1, and max { UAB, UBC } < U2, and UCA > UYY, and min { Ua, Ub } > U3, and max { Ua, Ub } < U4;
c) min { UBC, UCA } > U1, and max { UBC, UCA } < U2, and UAB > UYY, and Ub < UQX, and Ua > U3, and Ua < U4.
7. Voltage loss criterion for SCOTT transformer in phase loss
When phase A is in phase failure: the voltages of the high-voltage side UAB and UCA are reduced by about half to 50V, the voltages of the low-voltage side UT1 and UF1 are reduced by about half to 50V, and the voltages of the low-voltage side UT2 and UF2 are reduced by V3/2 and about 87V.
When phase B lacks phase: the voltage of the high-voltage side UAB and UBC is reduced by half to about 50V, and the voltage of the low-voltage side UT2 and UF2 is reduced to about 0V.
And C phase loss: the voltages of the high-voltage side UBC and UCA are reduced by about half to 50V, the voltages of the low-voltage side UT1 and UF1 are reduced by about half to 50V, and the voltages of the low-voltage side UT2 and UF2 are reduced by V3/2 and about 87V.
Therefore, the voltage loss criterion when the SCOTT transformer is out of phase is deduced as follows:
a) min { UAB, UCA, UT1, UF1} > U1, and max { UAB, UCA, UT1, UF1} < U2, and UBC > UYY, and min { UT2, UF2} > U3, and max { UT2, UF2} < U4;
b) min { UAB, UBC } > U1, and max { UAB, UBC } < U2, and min { UCA, UT1, UF1} > UYY, and max { UT2, UF2} < UQX;
c) min { UBC, UCA, UT1, UF1} > U1, and max { UBC, UCA, UT1, UF1} < U2, and UAB > UYY, and min { UT2, UF2} > U3, and max { UT2, UF2} < U4.
Under the condition of the phase loss of the transformer, the complete transformer voltage loss protection function with the phase loss judgment can be realized by combining the conventional voltage loss protection criterion max { UAB, UBC, UCA, Ua, Ub } < USY.
In the embodiment, in an RTDS simulation test, when modeling a transformer type, a common general high-voltage side phase B is used as a common phase for a transformer having a common phase, and when the common phase is a phase C, the basic principle is the same, and only B, C phases need to be exchanged correspondingly, so that a condition for determining a voltage loss when the common phase is the phase C can be obtained.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention falls within the protection scope of the present invention.
Claims (10)
1. A method for judging the voltage loss protection of a transformer with a phase loss function is characterized by comprising the following steps:
step 1: simulating a power supply mode of a traction substation through a real-time data simulation system (RTDS) to model the type of the transformer;
step 2: testing the changes of line voltages and phase voltages of the high-voltage side and the low-voltage side of the transformer when the A, B, C three-phase voltages of the high-voltage side of the transformer are respectively in phase loss;
and step 3: and (3) deducing the judgment condition of the transformer voltage loss protection with the phase loss function by combining the transformer principle and the data obtained in the step (2).
2. The method for judging the voltage loss protection of the transformer with the phase loss function according to claim 1, wherein the method comprises the following steps: the different types of the transformers can cause different voltage loss judgment conditions under corresponding phase loss conditions, and the transformers comprise a Vv transformer, a Vx transformer, an Ii transformer, an Iii transformer, an YNd11 transformer, an YNv transformer and an SCOTT transformer.
3. The method for judging the voltage loss protection of the transformer with the phase loss function according to claim 2, wherein the method comprises the following steps: the Vv transformer
When phase A is in phase failure: the voltage drop of the UAB line at the high-voltage side is 0V, and the voltage drop of the Ua phase at the low-voltage side is 0V;
when phase B lacks phase: the voltage of the UAB and UBC line on the high-voltage side is reduced by half, and the voltage of the Ua and Ub line on the low-voltage side is reduced by half;
and C phase loss: the voltage drop of the UBC line at the high-voltage side is 0V, and the voltage drop of the Ub phase at the low-voltage side is 0V;
therefore, the voltage loss judgment conditions of the Vv transformer in the phase loss of A, B, C are derived as follows:
(1) max { UAB, Ua } < UQX, and min { UBC, UCA, Ub } > UYY;
(2) min { UAB, UBC, Ua, Ub } > U1, and max { UAB, UBC, Ua, Ub } < U2, and UCA > UYY;
(3) max { UBC, Ub } < UQX, and min { UAB, UCA, Ua } > UYY;
UCA is high-voltage side line voltage, UQX indicates a default phase voltage loss fixed value, UYY indicates a line voltage fixed value, U1 and U2 respectively indicate voltage fixed values lower than one half of rated voltage and higher than one half of rated voltage, and a floating interval is formed;
the above three conditions are satisfied with one condition at will.
4. The method for judging the voltage loss protection of the transformer with the phase loss function according to claim 2, wherein the method comprises the following steps: the Vx transformer
When phase A is in phase failure: the voltage drop of the UAB line at the high-voltage side is 0V, and the voltage drop of the UT1 phase and the UF1 phase at the low-voltage side is 0V;
when phase B lacks phase: voltage of the UAB and UBC lines on the high-voltage side is reduced by half, and voltage of the UT1, UF1, UT2 and UF2 on the low-voltage side is reduced by half;
and C phase loss: the voltage drop of the high-voltage side UBC line is 0V, and the voltage drop of the low-voltage side UT2 and UF2 phases is 0V;
therefore, the conditions for judging the voltage loss of the Vx transformer when the phase is A, B, C default are derived as follows:
(1) max { UAB, UT1, UF1} < UQX, and min { UBC, UCA, UT2, UF2} > UYY;
(2) min { UAB, UBC, UT1, UF1, UT2, UF2} > U1, and max { UAB, UBC, UT1, UF1, UT2, UF2} < U2, and UCA > UYY;
(3) max { UBC, UT2, UF2} < UQX, and min { UAB, UCA, UT1, UF1} > UYY;
UCA is high-voltage side line voltage, UQX indicates a default phase voltage loss fixed value, UYY indicates a line voltage fixed value, U1 and U2 respectively indicate voltage fixed values lower than one half of rated voltage and higher than one half of rated voltage, and a floating interval is formed;
the above three conditions are satisfied with one condition at will.
5. The method for judging the voltage loss protection of the transformer with the phase loss function according to claim 2, wherein the method comprises the following steps: the Ii transformer
When phase A is in phase failure: the voltage drop of the UAB line at the high-voltage side is 0V, and the voltage drop of the Ua phase at the low-voltage side is 0V;
when phase B lacks phase: the voltage of a UAB line on the high-voltage side is reduced by half, and the voltage of a Ua line on the low-voltage side is reduced by half;
therefore, the voltage loss judgment conditions of the Ii transformer when the phase is A, B default are derived as follows:
(1)max{UAB、Ua}<UQX；
(2) min { UAB, Ua } > U1, and max { UAB, Ua } < U2;
wherein UQX indicates a default phase voltage loss fixed value, U1 and U2 respectively indicate voltage fixed values lower than one half of rated voltage and higher than one half of rated voltage, and a floating interval is formed;
the above two conditions may be satisfied with one condition at will.
6. The method for judging the voltage loss protection of the transformer with the phase loss function according to claim 2, wherein the method comprises the following steps: the Iii transformer
When phase A is in phase failure: the voltage drop of the UAB line at the high-voltage side is 0V, and the voltage drop of the UT1 phase and the UF1 phase at the low-voltage side is 0V;
when phase B lacks phase: the voltage of the UAB line on the high-voltage side is reduced by half, and the voltage of the UT1 and the UF1 phase on the low-voltage side is reduced by half;
therefore, the voltage loss judgment conditions of the Iii transformer when the A, B phase is in phase loss are derived as follows:
(1)max{UAB、UT1、UF1}<UQX；
(2) min { UAB, UT1, UF1} > U1, and max { UAB, UT1, UF1} < U2;
wherein UQX indicates a default phase voltage loss fixed value, U1 and U2 respectively indicate voltage fixed values lower than one half of rated voltage and higher than one half of rated voltage, and a floating interval is formed;
the above two conditions may be satisfied with one condition at will.
7. The method for judging the voltage loss protection of the transformer with the phase loss function according to claim 2, wherein the method comprises the following steps: the YNd11 transformer or YNv transformer
When phase A is in phase failure: the voltage of the UAB and UCA on the high-voltage side is reduced by half, the voltage of the Ua phase on the low-voltage side is reduced to 0V, and the voltage of the Ub phase on the low-voltage side is reduced to V3/2;
when phase B lacks phase: the voltages of the UAB and UBC on the high-voltage side are reduced by half, and the voltages of the Ua and Ub phases on the low-voltage side are reduced to V3/2;
and C phase loss: the voltage of the UBC and UCA on the high-voltage side is reduced by half, the voltage of the Ua phase on the low-voltage side is reduced to V3/2, and the voltage of the Ub phase on the low-voltage side is reduced to 0V;
therefore, the conditions for judging the voltage loss of the YNd11 transformer or the YNv transformer when the A, B, C phase is out of phase are derived as follows:
(1) min { UAB, UCA } > U1, and max { UAB, UCA } < U2, and UBC > UYY, and Ua < UQX, and Ub > U3, and Ub < U4;
(2) min { UAB, UBC } > U1, and max { UAB, UBC } < U2, and UCA > UYY, and min { Ua, Ub } > U3, and max { Ua, Ub } < U4;
(3) min { UBC, UCA } > U1, and max { UBC, UCA } < U2, and UAB > UYY, and Ub < UQX, and Ua > U3, and Ua < U4;
wherein UQX indicates a default phase voltage loss fixed value, UYY indicates a line voltage fixed value, U1 and U2 respectively indicate voltage fixed values lower than one half of rated voltage and higher than one half of rated voltage, and a floating interval is formed; u3 and U4 respectively indicate voltage fixed values lower than the rated voltage V3/2 and higher than the rated voltage V3/2, and form a floating interval;
the above three conditions are satisfied with one condition at will.
8. The method for judging the voltage loss protection of the transformer with the phase loss function according to claim 2, wherein the method comprises the following steps: the SCOTT transformer
When phase A is in phase failure: the voltage of the high-voltage side UAB and UCA is reduced by half, the voltage of the low-voltage side UT1 and UF1 is reduced by half, and the voltage of the low-voltage side UT2 and UF2 is reduced to V3/2;
when phase B lacks phase: voltage of the UAB and UBC line on the high-voltage side is reduced by half, and voltage of UT2 and UF2 phase on the low-voltage side is reduced to 0V;
and C phase loss: the voltage of the high-voltage side UBC and UCA is reduced by half, the voltage of the low-voltage side UT1 and UF1 is reduced by half, and the voltage of the low-voltage side UT2 and UF2 is reduced to V3/2;
therefore, the voltage loss judgment conditions of the SCOTT transformer when the phase is A, B, C out of phase are derived as follows:
(1) min { UAB, UCA, UT1, UF1} > U1, and max { UAB, UCA, UT1, UF1} < U2, and UBC > UYY, and min { UT2, UF2} > U3, and max { UT2, UF2} < U4;
(2) min { UAB, UBC } > U1, and max { UAB, UBC } < U2, and min { UCA, UT1, UF1} > UYY, and max { UT2, UF2} < UQX;
(3) min { UBC, UCA, UT1, UF1} > U1, and max { UBC, UCA, UT1, UF1} < U2, and UAB > UYY, and min { UT2, UF2} > U3, and max { UT2, UF2} < U4;
wherein UQX indicates a default phase voltage loss fixed value, UYY indicates a line voltage fixed value, U1 and U2 respectively indicate voltage fixed values lower than one half of rated voltage and higher than one half of rated voltage, and a floating interval is formed; u3 and U4 respectively indicate voltage fixed values lower than the rated voltage V3/2 and higher than the rated voltage V3/2, and form a floating interval;
the above three conditions are satisfied with one condition at will.
9. The method for judging the voltage loss protection of the transformer with the phase loss function according to claim 2, wherein the method comprises the following steps: when modeling is performed on the transformer type in the step 1, the high-voltage side B phase of the transformer with the common phase is adopted as the common phase, and if the common phase is the C phase, B, C phases are correspondingly exchanged, so that the voltage loss judgment condition when the common phase is the C phase can be obtained.
10. The method for judging the voltage loss protection of the transformer with the phase loss function according to any one of claims 3 to 8, wherein: and the voltage loss judgment condition under the condition of phase loss of the transformer is combined with the conventional voltage loss protection judgment basis max { UAB, UBC, UCA, Ua, Ub } < USY, so that the voltage loss protection function of the transformer with the phase loss judgment can be realized.
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