CN114252735B - Monitoring and judging method for positioning of 110kV line broken line branch - Google Patents

Monitoring and judging method for positioning of 110kV line broken line branch Download PDF

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CN114252735B
CN114252735B CN202111570932.6A CN202111570932A CN114252735B CN 114252735 B CN114252735 B CN 114252735B CN 202111570932 A CN202111570932 A CN 202111570932A CN 114252735 B CN114252735 B CN 114252735B
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line
phase
state
armor
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CN114252735A (en
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于晓蒙
孙文凯
王萌萌
胡振涛
马进
刘善军
姜恩泽
祁明
李迎涛
张逸康
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State Grid Jiangsu Electric Power Co ltd Zhenjiang Power Supply Branch
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State Grid Jiangsu Electric Power Co ltd Zhenjiang Power Supply Branch
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

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Abstract

The invention provides a monitoring and judging method for positioning a broken line branch of a 110kV line, which comprises the following steps: 1. judging the state of a first station line; 2. judging the state of a station B line; 3. judging the state of a third station line; 4. comprehensively judging the line state, and positioning the broken line phase and the broken line branch. The invention reduces the labor intensity of monitoring personnel and the reaction treatment time of abnormal accidents on the premise of improving the safe and reliable operation of the power grid, and provides technical support for the fault line inspection of power transmission operation personnel.

Description

Monitoring and judging method for positioning of 110kV line broken line branch
Technical Field
The invention relates to a monitoring and judging method for positioning a broken line branch of a 110kV line, and belongs to the technical field of 110kV transformer substations.
Background
As the power grid scale is continuously increased, the number of 110kV substations is also continuously increased, the scale of 110kV net racks is more and more complex, 110kVT connecting lines are more and more, and meanwhile, 110kV T connecting line disconnection accidents are more and more, so that the working intensity of monitoring staff is multiplied; for the positioning of a broken line branch of a 110kV line, the current automatic monitoring judging means is still in a blank state, and no technical means is used for distinguishing which branch is broken, so that the difficulty of transmission line inspection work is increased, and the accident processing efficiency is reduced; in order to improve the working efficiency of a monitor, reduce the working strength of the monitor and improve the handling efficiency of broken line accidents, the monitoring and judging method for positioning the broken line branch of the 110kV line is provided.
Disclosure of Invention
The invention provides a monitoring and judging method for positioning a broken line branch of a 110kV line, and aims to solve the problem that the existing technology cannot perform branch positioning on the broken line of the 110kV line.
The technical solution of the invention is as follows: a monitoring and judging method for positioning a 110kV line broken line branch circuit includes:
1. judging the state of a first station line;
2. judging the state of a station B line;
3. judging the state of a third station line;
4. comprehensively judging the line state, and positioning the broken line phase and the broken line branch.
Further, the determining the state of the station line specifically includes formula 1-formula 7:
U a armor ＝U B armor ＝U C armor ＝U 110kV (1)；
Figure BDA0003423324380000021
Figure BDA0003423324380000022
Figure BDA0003423324380000023
I B armor ＝I C armor >I A armor >0 (5)；
I A armor ＝I C armor >I B armor >0 (6)；
I A armor ＝I B armor >I C armor >0 (7)；
In U A armor 、U B armor 、U C armor 110kV bus phase voltages of the first station respectively, I A armor 、I B armor 、I C armor Three-phase current of 110kV line of first station, U 110kV Is 110kV bus rated phase voltage.
Further, when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 2, the system judges that the line state is as follows: "A station A phase broken wire"; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 3, the system judges the line state as follows: 'A station B phase broken line'; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 4, the system judges the line state as follows: 'A station C phase broken line'; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 5, the system judges the line state as follows: "a station a is abnormal"; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 6, the system judges the line state as follows: "a station B is abnormal"; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 7, the system judges the line state as follows: "a station C is abnormal".
Further, the judging the state of the station b line specifically includes formula 8-formula 15:
U AB A ＝U B ＝U C B ＝U 110kV (8)；
I AB A ＝I B ＝I C B >0 (9)；
Figure BDA0003423324380000031
Figure BDA0003423324380000032
Figure BDA0003423324380000033
Figure BDA0003423324380000034
Figure BDA0003423324380000035
Figure BDA0003423324380000036
In U AB A 、U B 、U C B 110kV bus phase voltages of the second station respectively, I AB A 、I B 、I C B Three-phase current of 110kV line of second station respectively, U 110kV Is 110kV bus rated phase voltage.
Further, when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 8 and 9, the system judges that the line state is as follows: "station B is normal"; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 10 and 11, the system judges that the line state is as follows: 'station A phase broken line'; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 12 and 13, the system judges that the line state is as follows: b phase broken line of station B; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 14 and 15, the system judges that the line state is as follows: station C phase broken line.
Further, the judging of the state of the bus station line specifically includes the following formulas (16) - (23):
U a C ＝U B C ＝U C ＝U 110kV (16)；
I A C ＝I B C ＝I C >0 (17)；
Figure BDA0003423324380000041
Figure BDA0003423324380000042
Figure BDA0003423324380000043
Figure BDA0003423324380000044
Figure BDA0003423324380000045
Figure BDA0003423324380000046
In U A C 、U B C 、U C Respectively the phase voltages of 110kV buses of the third generation station, I A C 、I B C 、I C Three-phase current of the C station 110kV line and U 110kV Is 110kV bus rated phase voltage.
Further, when the monitoring master station system detects that the related telemetry data simultaneously satisfies the formulas 16 and 17, the system judges that the line state is: "Prop stand normal"; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 18 and 19, the system judges that the line state is as follows: 'third station A phase broken line'; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 20 and 21, the system judges that the line state is as follows: 'third phase B phase broken line'; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 22 and 23, the system judges that the line state is as follows: 'C phase disconnection of third station'.
Further, the comprehensive judgment circuit state locates the disconnection phase and the disconnection branch, specifically includes that the main station monitoring system carries out comprehensive judgment according to the circuit states of the first station, the second station and the third station, specifically includes:
when the conditions of 'A-phase disconnection', 'B-phase disconnection', 'C-phase disconnection' are met, the system judges that the line state is 'branch one-A-phase disconnection';
when the conditions of abnormal A station A phase, broken B station A phase and normal C station are met, the system judges that the line state is broken branch two A phases;
when the conditions of abnormal A station A, normal B station and broken A C station are met, the system judges that the line state is branch three A phase broken;
when the conditions of 'A station B phase disconnection', 'B station B phase disconnection', 'C station B phase disconnection' are met, the system judges that the line state is 'branch one B phase disconnection';
when the conditions of 'abnormal A station B', 'B phase broken line', 'C station normal' are met, the system judges that the line state is 'branch two B phase broken line';
when the conditions of 'abnormal first station B', 'normal second station' and 'third station B phase disconnection' are met, the system judges that the line state is 'branch three B phase disconnection';
when the conditions of 'A station C phase disconnection', 'B station C phase disconnection', 'C station C phase disconnection' are met, the system judges that the line state is 'branch one C phase disconnection';
when the conditions of 'abnormal first station C', 'second station C disconnection', 'third station normal' are met, the system judges that the line state is 'branch second C disconnection';
when the conditions of 'abnormal first station C', 'normal second station' and 'third station C disconnection' are met, the system judges that the line state is 'branch three C disconnection'.
Further, the first station is a transformer station on the power supply side, the second station and the third station are transformer stations on the load side, the first station is connected with the main circuit of the power grid through a branch I, the second station is connected with the main circuit of the power grid through a branch II, and the third station is connected with the main circuit of the power grid through a branch III.
Further, said is U 110kV The 110kV bus is rated for line voltage, and in actual operation, the voltage is a qualified range of 110kV bus voltage.
Furthermore, the monitoring master station system is a data analysis processing system of a power grid monitoring dispatching end and is commonly used as a SCADA system.
The invention has the beneficial effects that:
1) The invention is convenient for the monitoring system to realize the automatic line breaking branch positioning function after the 110kV line breaking branch positioning is applied, reduces the labor intensity of monitoring personnel and the reaction treatment time of abnormal accidents on the premise of improving the safe and reliable operation of a power grid, and provides technical support for the fault line inspection of power transmission operating personnel;
2) The invention is convenient to further improve the automation and intelligent degree of the monitoring profession, and provides a reliable technical means for converting the manual judgment by a monitor into the automatic judgment by a computer.
Drawings
Fig. 1 is a schematic diagram of the grid rack wiring in embodiment 1.
Fig. 2 is a logic diagram of the state of the a-station line in embodiment 1.
Fig. 3 is a logic diagram of the state of the b-station line in embodiment 1.
Fig. 4 is a logic diagram of the status of the bus station line in embodiment 1.
Fig. 5 is a schematic diagram of the state logic of the branch circuit in embodiment 1.
Detailed Description
A monitoring and judging method for positioning a 110kV line broken line branch circuit includes:
1. judging the state of a first station line;
2. judging the state of a station B line;
3. judging the state of a third station line;
4. comprehensively judging the line state, and positioning the broken line phase and the broken line branch.
The judging of the state of the A station line specifically comprises the following steps of formula 1-formula 7:
U a armor ＝U B armor ＝U C armor ＝U 110kV (1)；
Figure BDA0003423324380000071
Figure BDA0003423324380000072
Figure BDA0003423324380000073
I B armor ＝I C armor >I A armor >0 (5)；
I A armor ＝I C armor >I B armor >0 (6)；
I A armor ＝I B armor >I C armor >0 (7)；
In U A armor 、U B armor 、U C armor 110kV bus phase voltages of the first station respectively, I A armor 、I B armor 、I C armor Three-phase current of 110kV line of first station, U 110kV Is 110kV bus rated phase voltage.
When the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 2, the system judges the line state as follows: "A station A phase broken wire"; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 3, the system judges the line state as follows: 'A station B phase broken line'; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 4, the system judges the line state as follows: 'A station C phase broken line'; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 5, the system judges the line state as follows: "a station a is abnormal"; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 6, the system judges the line state as follows: "a station B is abnormal"; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 7, the system judges the line state as follows: "a station C is abnormal".
The judging of the station B line state specifically comprises the following steps of formula 8-formula 15:
U AB A ＝U B ＝U C B ＝U 110kV (8)；
I AB A ＝I B ＝I C B >0 (9)；
Figure BDA0003423324380000081
Figure BDA0003423324380000082
Figure BDA0003423324380000083
Figure BDA0003423324380000084
Figure BDA0003423324380000085
Figure BDA0003423324380000086
In U AB A 、U B 、U C B 110kV bus phase voltages of the second station respectively, I AB A 、I B 、I C B Three-phase current of 110kV line of second station respectively, U 110kV Is 110kV bus rated phase voltage.
When the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 8 and 9, the system judges that the line state is as follows: "station B is normal"; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 10 and 11, the system judges that the line state is as follows: 'station A phase broken line'; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 12 and 13, the system judges that the line state is as follows: b phase broken line of station B; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 14 and 15, the system judges that the line state is as follows: station C phase broken line.
The judging of the state of the line of the third station specifically comprises a formula (16) -a formula (23):
U a C ＝U B C ＝U C ＝U 110kV (16)；
I A C ＝I B C ＝I C >0 (17)；
Figure BDA0003423324380000091
Figure BDA0003423324380000092
Figure BDA0003423324380000093
Figure BDA0003423324380000094
Figure BDA0003423324380000095
Figure BDA0003423324380000096
In U A C 、U B C 、U C Respectively the phase voltages of 110kV buses of the third generation station, I A C 、I B C 、I C Three-phase current of the C station 110kV line and U 110kV Is 110kV bus rated phase voltage.
When the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 16 and 17, the system judges that the line state is as follows: "Prop stand normal"; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 18 and 19, the system judges that the line state is as follows: 'third station A phase broken line'; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 20 and 21, the system judges that the line state is as follows: 'third phase B phase broken line'; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 22 and 23, the system judges that the line state is as follows: 'C phase disconnection of third station'.
The comprehensive judgment circuit state is that the positioning broken lines are the same, broken line branches, and specifically comprises a main station monitoring system for carrying out comprehensive judgment according to the circuit states of a first station, a second station and a third station, and specifically comprises the following steps:
when the conditions of 'A-phase disconnection', 'B-phase disconnection', 'C-phase disconnection' are met, the system judges that the line state is 'branch one-A-phase disconnection';
when the conditions of abnormal A station A phase, broken B station A phase and normal C station are met, the system judges that the line state is broken branch two A phases;
when the conditions of abnormal A station A, normal B station and broken A C station are met, the system judges that the line state is branch three A phase broken;
when the conditions of 'A station B phase disconnection', 'B station B phase disconnection', 'C station B phase disconnection' are met, the system judges that the line state is 'branch one B phase disconnection';
when the conditions of 'abnormal A station B', 'B phase broken line', 'C station normal' are met, the system judges that the line state is 'branch two B phase broken line';
when the conditions of 'abnormal first station B', 'normal second station' and 'third station B phase disconnection' are met, the system judges that the line state is 'branch three B phase disconnection';
when the conditions of 'A station C phase disconnection', 'B station C phase disconnection', 'C station C phase disconnection' are met, the system judges that the line state is 'branch one C phase disconnection';
when the conditions of 'abnormal first station C', 'second station C disconnection', 'third station normal' are met, the system judges that the line state is 'branch second C disconnection';
when the conditions of 'abnormal first station C', 'normal second station' and 'third station C disconnection' are met, the system judges that the line state is 'branch three C disconnection'.
The first station is a transformer station on the power supply side, the second station and the third station are transformer stations on the load side, the first station is connected with the main circuit of the power grid through a first branch, the second station is connected with the main circuit of the power grid through a second branch, and the third station is connected with the main circuit of the power grid through a third branch.
Said is U 110kV The 110kV bus is rated for line voltage, and in actual operation, the voltage is a qualified range of 110kV bus voltage.
The monitoring master station system is a data analysis processing system of a power grid monitoring dispatching end and is commonly used as a SCADA system.
The equations in equations 1-23 should be approximately equal in practice, with an error of no more than 30%.
The invention applies the parameters of bus voltage, line current and the like of a plurality of substations as locking conditions, thereby improving the judgment accuracy.
Example 1
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments.
A monitoring and judging method for positioning a 110kV line broken line branch comprises the following steps:
judging the state of the first station line, wherein the formulas are from the condition 1 to the condition 7;
judging the state of the station B line, wherein the formulas are from condition 8 to condition 15;
judging the state of the third station line, wherein the formulas are from the condition 16 to the condition 23;
comprehensively judging the state of the line, positioning the broken line to be identical and breaking the line branch.
A first station:
U a armor ＝U B armor ＝U C armor ＝U 110kV (condition 1);
Figure BDA0003423324380000121
Figure BDA0003423324380000122
Figure BDA0003423324380000123
I b armor ＝I C armor >I A armor >0 (condition 5);
I a armor ＝I C armor >I B armor >0 (condition 6);
I a armor ＝I B armor >I C armor >0 (condition 7).
Station B:
U AB A ＝U B ＝U C B ＝U 110kV (condition 8);
I AB A ＝I B ＝I C B >0 (condition 9);
Figure BDA0003423324380000124
Figure BDA0003423324380000125
Figure BDA0003423324380000126
Figure BDA0003423324380000127
Figure BDA0003423324380000131
Figure BDA0003423324380000132
c, station:
U a C ＝U B C ＝U C ＝U 110kV (condition 16);
I a C ＝I B C ＝I C >0 (condition 17);
Figure BDA0003423324380000133
Figure BDA0003423324380000134
Figure BDA0003423324380000135
Figure BDA0003423324380000136
Figure BDA0003423324380000137
Figure BDA0003423324380000138
wherein U is A armor 、U B armor 、U C armor For the phase voltage of 110kV bus of the first station, I A armor 、I B armor 、I C armor For the three-phase current of the 110kV line of the first station, U AB A 、U B 、U C B Is 110kV bus phase voltage of the second station, I AB A 、I B 、I C B Is the three-phase current of 110kV line of the second station, U A C 、U B C 、U C For the phase voltage of the 110kV bus of the third station, I A C 、I B C 、I C For the three-phase current of the 110kV line of the third station, U 110kV Is 110kV bus rated phase voltage.
A first station: when the monitoring master station system detects relevant telemetry data, the method simultaneously meets the following conditions:
in condition 1 and condition 2, the system judges the line state as follows: "A station A phase broken wire";
in condition 1 and condition 3, the system judges the line state as follows: 'A station B phase broken line';
in condition 1 and condition 4, the system judges the line state as follows: 'A station C phase broken line';
in condition 1 and condition 5, the system judges the line state as follows: "a station a is abnormal";
in condition 1 and condition 6, the system judges the line state as follows: "a station B is abnormal";
in condition 1 and condition 7, the system judges the line state as follows: "a station C is abnormal".
Station B: when the monitoring master station system detects relevant telemetry data, the method simultaneously meets the following conditions:
in the conditions 8 and 9, the system judges the line state as follows: "station B is normal";
in conditions 10 and 11, the system judges the line state as follows: 'station A phase broken line';
under conditions 12 and 13, the system determines that the line state is: b phase broken line of station B;
under conditions 14 and 15, the system determines that the line state is: station C phase broken line.
C, station: when the monitoring master station system detects relevant telemetry data, the method simultaneously meets the following conditions:
under conditions 16 and 17, the system determines that the line state is: "Prop stand normal";
under conditions 18 and 19, the system determines that the line state is: 'third station A phase broken line';
under conditions 20 and 21, the system determines that the line state is: 'third phase B phase broken line';
under conditions 22 and 23, the system determines that the line state is: 'C phase disconnection of third station'.
And (3) comprehensive judgment: the master station monitoring system carries out comprehensive judgment according to the line states of the first station, the second station and the third station:
the system meets the conditions of 'A-phase disconnection', 'B-phase disconnection', 'C-phase disconnection', and the system judges that the line state is 'branch one-A-phase disconnection';
the system meets the conditions of abnormal A-phase A, broken B-phase A and normal C-phase A, and judges that the line state is broken branch two-phase A;
the system meets the conditions of abnormal A-phase station A, normal B-phase station and C-phase station A disconnection, and judges that the line state is branch three-A-phase disconnection;
the method meets the requirements of 'A station B phase disconnection', 'B station B phase disconnection', 'C station B phase disconnection', and the system judges that the line state is 'branch one B phase disconnection';
the system meets the conditions of 'abnormal A station B', 'B phase broken line of B station', 'C station normal', and the system judges that the line state is 'branch two B phase broken line';
the system meets the conditions of 'abnormal A station B', 'normal B station' and 'C station B phase disconnection', and judges that the line state is 'branch three B phase disconnection';
the system meets the conditions of 'A station C phase disconnection', 'B station C phase disconnection', 'C station C phase disconnection', and the system judges that the line state is 'branch one C phase disconnection';
the system meets the conditions of abnormal first station C, broken second station C and normal third station, and judges that the line state is broken second branch C;
the system meets the conditions of abnormal first station C, normal second station and C phase disconnection of third station, and judges the line state as three C phase disconnection of branch.
The embodiment can use the current technical conditions under the condition of not adding equipment, and is convenient for a system to synthesize the 110kV line disconnection branch positioning alarm signal.

Claims (3)

1. A monitoring and judging method for positioning a 110kV line broken line branch is characterized by comprising the following steps:
1) Judging the state of a first station line;
2) Judging the state of the station B line;
3) Judging the state of the line of the third station;
4) Comprehensively judging the state of the line, and positioning the broken line phase and the broken line branch;
the judging of the state of the A station line specifically comprises the following steps of formula 1-formula 7:
U a armor ＝U B armor ＝U C armor ＝U 110kV (1)；
Figure FDA0004273969000000011
Figure FDA0004273969000000013
I B armor ＝I C armor ＞I A armor ＞0 (5)；
I A armor ＝I C armor ＞I B armor ＞0 (6)；
I A armor ＝I B armor ＞I C armor ＞0 (7)；
In the middle of，U A armor 、U B armor 、U C armor 110kV bus phase voltages of the first station respectively, I A armor 、I B armor 、I C armor Three-phase current of 110kV line of first station, U 110kV Rated phase voltage of 110kV bus;
when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 2, the system judges the line state as follows: "A station A phase broken wire"; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 3, the system judges the line state as follows: 'A station B phase broken line'; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 4, the system judges the line state as follows: 'A station C phase broken line'; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 5, the system judges the line state as follows: "a station a is abnormal"; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 6, the system judges the line state as follows: "a station B is abnormal"; when the monitoring master station system detects that the relative telemetry data of the first station simultaneously satisfies the formulas 1 and 7, the system judges the line state as follows: "a station C is abnormal";
the judging of the station B line state specifically comprises the following steps of formula 8-formula 15:
U AB A ＝U B ＝U C B ＝U 110kV (8)；
I AB A ＝I B ＝I C B ＞0 (9)；
Figure FDA0004273969000000021
Figure FDA0004273969000000022
Figure FDA0004273969000000023
Figure FDA0004273969000000024
Figure FDA0004273969000000025
Figure FDA0004273969000000026
In U AB A 、U B 、U C B 110kV bus phase voltages of the second station respectively, I AB A 、I B 、I C B Three-phase current of 110kV line of second station respectively, U 110kV Rated phase voltage of 110kV bus;
when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 8 and 9, the system judges that the line state is as follows: "station B is normal"; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 10 and 11, the system judges that the line state is as follows: 'station A phase broken line'; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 12 and 13, the system judges that the line state is as follows: b phase broken line of station B; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 14 and 15, the system judges that the line state is as follows: 'station C phase broken line';
the judging of the state of the line of the third station specifically comprises a formula (16) -a formula (23):
U a C ＝U B C ＝U C ＝U 110kV (16)；
I A C ＝I B C ＝I C ＞0 (17)；
Figure FDA0004273969000000031
Figure FDA0004273969000000032
Figure FDA0004273969000000033
Figure FDA0004273969000000034
Figure FDA0004273969000000035
Figure FDA0004273969000000036
In U A C 、U B C 、U C Respectively the phase voltages of 110kV buses of the third generation station, I A C 、I B C 、I C Three-phase current of the C station 110kV line and U 110kV Rated phase voltage of 110kV bus;
when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 16 and 17, the system judges that the line state is as follows: "Prop stand normal"; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 18 and 19, the system judges that the line state is as follows: 'third station A phase broken line'; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 20 and 21, the system judges that the line state is as follows: 'third phase B phase broken line'; when the monitoring master station system detects that the related telemetry data simultaneously meets the formulas 22 and 23, the system judges that the line state is as follows: 'C phase disconnection of third station';
the comprehensive judgment circuit state is that the positioning broken lines are the same, broken line branches, and specifically comprises a main station monitoring system for carrying out comprehensive judgment according to the circuit states of a first station, a second station and a third station, and specifically comprises the following steps:
when the conditions of 'A-phase disconnection', 'B-phase disconnection', 'C-phase disconnection' are met, the system judges that the line state is 'branch one-A-phase disconnection';
when the conditions of abnormal A station A phase, broken B station A phase and normal C station are met, the system judges that the line state is broken branch two A phases;
when the conditions of abnormal A station A, normal B station and broken A C station are met, the system judges that the line state is branch three A phase broken;
when the conditions of 'A station B phase disconnection', 'B station B phase disconnection', 'C station B phase disconnection' are met, the system judges that the line state is 'branch one B phase disconnection';
when the conditions of 'abnormal A station B', 'B phase broken line', 'C station normal' are met, the system judges that the line state is 'branch two B phase broken line';
when the conditions of 'abnormal first station B', 'normal second station' and 'third station B phase disconnection' are met, the system judges that the line state is 'branch three B phase disconnection';
when the conditions of 'A station C phase disconnection', 'B station C phase disconnection', 'C station C phase disconnection' are met, the system judges that the line state is 'branch one C phase disconnection';
when the conditions of 'abnormal first station C', 'second station C disconnection', 'third station normal' are met, the system judges that the line state is 'branch second C disconnection';
when the conditions of 'abnormal first station C', 'normal second station' and 'third station C disconnection' are met, the system judges that the line state is 'branch three C disconnection'.
2. The monitoring and judging method for positioning of a broken line branch of a 110kV line according to claim 1 is characterized in that the first station is a transformer substation on a power supply side, the second station and the third station are transformer substations on a load side, the first station is connected with a main circuit of a power grid through a branch I, the second station is connected with the main circuit of the power grid through a branch II, and the third station is connected with the main circuit of the power grid through a branch III.
3. The monitoring and judging method for positioning a broken line branch of a 110kV line according to claim 1, wherein the monitoring master station system is a power grid monitoring dispatching end data analysis processing system.
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