CN110739670A - 110kV line disconnection relay protection method for comparing voltages at two sides of line - Google Patents

110kV line disconnection relay protection method for comparing voltages at two sides of line Download PDF

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Publication number
CN110739670A
CN110739670A CN201911186659.XA CN201911186659A CN110739670A CN 110739670 A CN110739670 A CN 110739670A CN 201911186659 A CN201911186659 A CN 201911186659A CN 110739670 A CN110739670 A CN 110739670A
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line
phase
voltage
bus
power
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CN110739670B (en
Inventor
李静
陈永明
杨茹
胡航
曹斌
汤大海
魏刚
王律
徐溯
张�浩
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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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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/266Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving switching on a spare supply
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0084Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/28Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/263Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values

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  • Physics & Mathematics (AREA)
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Abstract

The invention discloses kinds of 110kV line disconnection relay protection methods for comparing voltages on two sides of a line, which fully utilize the fault characteristics of PT secondary voltages of 110kV buses of a power supply end and a load end substation when the 110kV line is in single-phase disconnection, compare the voltages of the 110kV bus at two ends of the 110kV line, recognize the 110kV line single-phase disconnection, and transfer power supply by the load end 110kV substation by adopting a switching-on and switching-off loop operation, so that the method is simple and easy to implement, can effectively prevent the influence of the transformer phase-lacking power supply on a power grid and load power supply, simultaneously prevent 110kV transformer 110kV neutral points from being burnt out, and is beneficial to safe and stable operation.

Description

110kV line disconnection relay protection method for comparing voltages at two sides of line
Technical Field
The invention relates to kinds of 110kV line disconnection relay protection methods for comparing voltages on two sides of a line, and belongs to the technical field of power equipment relay protection.
Background
The invention provides relay protection devices aiming at 110kV line breakage, which are not provided with a 110kV line optical fiber channel transmission line two-side voltage information at a load end transformer substation, compare the line two-side voltage to identify the 110kV line breakage and adopt a single-phase line breakage relay protection method for transferring power supply by a closing ring operation.
Disclosure of Invention
The invention aims to provide single-phase line-breaking relay protection methods for comparing voltages on two sides of a line, which can be applied to a power transmission and distribution network and used for transmitting voltage information on two sides of the line through a 110kV line optical fiber channel in a load end 110kV transformer substation, identifying the line breaking of the 110kV line by comparing the voltages on the two sides of the line and transferring power supply by adopting ring closing and opening operation.
The purpose of the invention is realized by the following technical scheme:
A110 kV line disconnection relay protection method for comparing voltages on two sides of a line comprises the following steps:
, judging the condition of tripping on the incoming line breaker after the 110kV line is broken and the load end of the 110kV substation is closed
1.1 conditions for judging 2DL or 3DL of 1 # 110kV line disconnection on-load end 110kV substation standby circuit breaker and 1DL of 1 # trip incoming line circuit breaker at 1 kV line disconnection on-load end, and starting 1 # 110kV line disconnection alarm condition
a. Collecting 110kV bus PT secondary A-phase voltage U corresponding to 110kV transformer substation at power supply endaPhase U of B phase voltagebC phase voltage UcOpen delta voltage 3Uo
(1) PT secondary B phase voltage value U of power supply end corresponding to 110kV busaGreater than the setting value U1;
(2) PT secondary C-phase voltage value U of power supply end corresponding to 110kV busbGreater than the setting value U1;
(3) PT secondary A-phase voltage value U of 110kV bus corresponding to power supply endcGreater than the setting value U1;
(4) secondary voltage value 3U of power supply end corresponding to secondary opening triangle of bus PToIs less than the setting value U2;
(5) a power end 110kV line circuit breaker 4DL of a No. 1 110kV line is at a switching-on position;
when the conditions are all met, the voltage of a 110kV bus corresponding to a power end 110kV transformer substation is normal, and the normal voltage signal is transmitted to 110kV disconnection protection in 110kV line protection of a No. 1 110kV transformer substation under the load of the No. 1 110kV line through an optical fiber channel of No. 1 110kV power line optical fiber differential protection;
b. collection load end 110kV transformer substation I section bus PT secondary A phase voltage UaPhase U of B phase voltagebC phase voltage Uc Open delta voltage 3Uo
(1) The PT secondary voltage value of the 110kV bus at the No. 1 110kV line open-circuit phase load end is lower than a setting value U3;
(2) the PT secondary voltage value of the 110kV bus at the 1 # 110kV line non-broken line phase 1 load end is greater than a setting value U1;
(3) the PT secondary voltage value of the 110kV bus at the No. 1 110kV line non-broken line phase 2 load end is greater than a setting value U1;
(4) the PT opening triangular secondary voltage value of the No. 1 110kV bus at the load end of the 110kV line is greater than a setting value U4;
(5) a load end 110kV line breaker 1DL of a No. 1 110kV line is at a switching-on position;
when the conditions are met, the abnormal voltage of the I section of the bus of the 110kV transformer substation at the load end is represented;
when the received power end 110kV transformer substation corresponds to a normal 110kV bus and the voltage of a first-section bus of the load end 110kV transformer substation is abnormal, identifying and judging that a No. 1 110kV power line is broken, delaying by t1 to protect the 110kV broken line in the protection of the 110kV line of the load end 110kV transformer substation, and after closing a standby power circuit breaker 2DL or 3DL, tripping off a circuit breaker 1DL on the load side of the No. 1 110kV power line to enable a transformer which loses power to be recovered to the standby power line for power supply; simultaneously starting a No. 1 110kV line disconnection alarm;
1.2 conditions for judging 1DL or 3DL of standby circuit breaker of No. 2 110kV line disconnection on-load end 110kV transformer substation and 2DL of tripping-off No. 2 incoming line circuit breaker, and conditions for starting No. 2 110kV line disconnection alarm
a. Collecting 110kV bus PT secondary A-phase voltage U corresponding to 110kV transformer substation at power supply endaPhase U of B phase voltagebC phase voltage UcOpen delta voltage 3Uo
(1) The voltage value of the PT secondary B phase of the 110kV bus corresponding to the power supply end is greater than a setting value U1;
(2) the PT secondary C-phase voltage value of the power supply end corresponding to the 110kV bus is greater than a setting value U1;
(3) the voltage value of a PT secondary A phase of a 110kV bus corresponding to a power supply end is greater than a setting value U1;
(4) the secondary voltage value 3UO of the secondary opening triangle of the power supply end corresponding to the bus PT is smaller than the setting value U2;
(5) a power end 110kV line circuit breaker 5DL of a No. 2 110kV line is at a switching-on position;
the conditions are all met, and the condition indicates that the 110kV bus voltage corresponding to the 110kV transformer substation at the power end is normal; the normal voltage signal is transmitted to a 110kV disconnection protection in 110kV line protection of a load 110kV transformer substation of a No. 2 110kV line through an optical fiber channel of the No. 2 110kV power line optical fiber differential protection;
b. collecting PT secondary A-phase voltage U of II-section bus of 110kV transformer substation at load endaPhase U of B phase voltagebC phase voltage UcOpen delta voltage 3Uo
(1) The secondary voltage value of a No. 2 110kV line open-circuit phase load end 110kV bus PT is lower than a setting value U3;
(2) the PT secondary voltage value of the 110kV bus at the non-broken line phase 1 load end of the No. 2kV line is greater than a setting value U1;
(3) the secondary voltage value 3UO of the 110kV bus PT at the non-broken line phase 2 load end of the No. 2kV line is greater than the setting value U1;
(4) the PT opening triangular secondary voltage value of the No. 2 110kV line load end 110kV bus is greater than a setting value U4;
(5) a 110kV line breaker 1DL at a load end of a No. 2 110kV line is at a switching-on position;
when the conditions are met, the voltage abnormality of the second section of the bus of the 110kV transformer substation at the load end is represented;
when the received power end 220kV transformer substation corresponding to a 110kV bus is normal and the voltage of a second-section bus of the load end 110kV transformer substation is abnormal, identifying and judging that a No. 2 110kV power line is broken, delaying by t1 to protect the 110kV broken line in the protection of the 110kV line of the load end 110kV transformer substation, and after closing a standby power circuit breaker 2DL or 3DL, tripping off a circuit breaker 1DL on the load side of the No. 1 110kV power line to enable a transformer without a power supply to be recovered to the standby power line for power supply; and simultaneously, the No. 2 110kV line disconnection alarm is started.
The object of the present invention can be achieved by the following technical measures :
the 110kV line disconnection relay protection method for comparing voltages at two sides of a line comprises the following steps:
setting value U1 is 0.9Ea, Ea is a phase voltage value, and the corresponding PT secondary voltage is 58V; 0.9 Ea-52.2V; setting value U2 is between 4 and 8V; the setting value U3 is 0.55Ea, namely 31.9V; the setting value U4 is 0.9Eab, which is the PT secondary opening triangle rated voltage value and is 100V.
In the 110kV line disconnection relay protection method for comparing voltages at two sides of the line, the time t1 is set as follows: three-phase different-period time when the switch is closed is avoided: taking 0.1-0.2 seconds.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention fully utilizes the fault characteristics of the PT secondary voltage of the 110kV bus of the power supply end and the load end substation when the 110kV line is in single-phase disconnection, compares the bus voltages at two ends of the 110kV line, identifies the 110kV line single-phase disconnection, and transfers power supply by the load end 110kV substation through ring closing and opening operation, thus being simple and easy.
2. According to the invention, the voltage information at two sides of the line is transmitted through the 110kV line optical fiber channel, the voltage at two sides of the line is compared to identify the line break of the 110kV line, the load end 110kV transformer substation transfers power supply by adopting a loop closing and opening operation, so that the transformer losing the power supply is recovered to the relay protection scheme of the power supply on the standby power supply, the influence of the transformer phase-lacking power supply on the power grid and the load power supply can be effectively prevented, the 110kV transformer 110kV neutral point is prevented from being burnt, and the safe and stable operation of the power grid is facilitated.
3. The method is implemented by adopting the 110kV line protection devices on two sides of the 110kV line, and does not need to increase hardware equipment.
4. The method is not only suitable for the mode of ungrounded 110kV neutral points of the transformer, but also suitable for the mode of grounded 110kV neutral points of the transformer.
Drawings
FIG. 1 is a schematic diagram of a 110kV disconnection subsystem;
FIG. 2 is a vector diagram of 110kV bus voltage on the load side of a vector diagram of 110kV line disconnection 110kV bus voltage;
FIG. 3 is a vector diagram of 110kV bus voltage on the power side of a vector diagram of 110kV line disconnection 110kV bus voltage;
FIG. 4 is a schematic diagram of a 110kV disconnection and load side disconnection grounded subsystem;
FIG. 5 is a vector diagram of 110kV bus voltage on the load side of a 110kV bus voltage vector diagram II when the 110kV line is disconnected;
FIG. 6 is a vector diagram of 110kV bus voltage at the power side of a 110kV bus voltage vector diagram II when the 110kV line is disconnected;
FIG. 7 is a schematic diagram of a 110kV disconnection subsystem II;
FIG. 8 is a vector diagram of 110kV bus voltage on the load side of a third vector diagram of the broken bus voltage of the 110kV line;
FIG. 9 is a vector diagram of 110kV bus voltage at the power side of the third vector diagram of the broken bus voltage of the 110kV line;
FIG. 10 is a schematic diagram of a second system with 110kV disconnection and load side disconnection grounded times;
FIG. 11 is a schematic diagram of the single-phase disconnection protection of the 110kV line of the present invention;
fig. 12 is a sub-main wiring diagram of a single bus segment of a 110kV substation.
Detailed Description
The invention is further described with reference to the figures and the specific embodiments.
110kV line breakage analysis:
and when the 110kV neutral point of the load side 110kV substation transformer is not grounded, the 110kV line disconnection condition is 1. And when the 110kV neutral point of the 110kV substation transformer on the load side is grounded, the 110kV line disconnection condition is 2.
1.1110 kV line broken line 1
1.1.1110 kV line broken wire
Fig. 1 shows a schematic diagram of a 110kV disconnection subsystem, wherein a 110kV side of a 220kV substation on a system side is an effective grounding system, and a 110kV neutral point of a 110kV substation transformer on a load side is ungrounded and grounded through a gap.
The electric potentials of the 110kV side power supplies of the 220kV transformer substation on the system side are respectively set as EA、EB、EC. When a certain part of the 110kV line is broken, such as phase A, the voltage of the 110kV bus of the 110kV transformer substation at the load side is obtained through analysis:
Figure BDA0002292565210000041
(1) in the formula of UA、UB、UCThe voltage of A phase, B phase and C phase of 110kV bus of 110kV transformer substation at load side is U phase0Is 110kV neutral point voltage of 110kV transformer substation on load side, 3U0The voltage of a secondary open-delta winding of a 110kV bus voltage transformer (PT for short) of a load side 110kV substation transformer is obtained. The vector diagrams are shown in FIGS. 2 and 3.
When a 110kV line is broken, the voltage of the 110kV bus at the 220kV substation on the system side is E, and the voltage of the A phase, the voltage of the B phase and the voltage of the C phase are respectively EA、EB、EC,3U0Is 0, i.e. the three-phase voltage is maintained under normal conditions.
1.1.2110 kV line disconnection and load side disconnection grounding
Fig. 4 shows a schematic of a 110kV disconnection and load side disconnection grounding subsystem, wherein a 110kV side of a 220kV substation on the system side is an effective grounding system, and a 110kV neutral point of a 110kV substation transformer on the load side is ungrounded and grounded through a gap.
The electric potentials of the 110kV side power supplies of the 220kV transformer substation on the system side are respectively set as EA、EB、EC. When a certain part of the 110kV line is broken and the broken line of the load side is grounded, such as phase A, the voltage of the 110kV bus of the 110kV transformer substation on the load side is obtained through analysis:
Figure BDA0002292565210000051
(2) in the formula of UA、UB、UCThe voltage of A phase, B phase and C phase of 110kV bus of 110kV transformer substation at load side is U phase0Is 110kV neutral point voltage of 110kV transformer substation on load side, 3U0The voltage of a secondary open-delta winding of a 110kV bus voltage transformer (PT for short) of a load side 110kV substation transformer is obtained. The vector diagrams are shown in fig. 5 and 6.
When a 110kV line is broken, the voltage of the 110kV bus at the 220kV substation on the system side is E, and the voltage of the A phase, the voltage of the B phase and the voltage of the C phase are respectively EA、EB、EC,3U0Is 0, i.e. the three-phase voltage is maintained under normal conditions.
1.1.3110 kV line disconnection and system side disconnection point grounding
When the 110kV line is broken and the broken line of the system side is grounded, for the system side, the fault is mainly reflected in the single-phase grounding short-circuit fault of the 110kV line, so that the 110kV line protection of the 220kV transformer substation can start tripping to remove the fault (the 110kV line breaker trips to remove the fault, the 110kV line breaker is overlapped, then the single-phase grounding short-circuit fault of the 110kV line, the 110kV line protection of the 220kV transformer substation restarts tripping and removes the fault).
Analysis of 110kV neutral click-through of 110kV transformer substation in 1.1.4110 kV line disconnection
Table 1 shows the power frequency discharge voltage at different gaps. By analysing the neutral point to ground voltage U of the transformer0It can be determined whether the gap is likely to break down, in conjunction with table 1.
TABLE 1 Power frequency discharge Voltage for different gaps
Figure BDA0002292565210000052
For the analytical results of 1.1.3, 3U0Has a maximum value of 150V, and a neutral point to ground voltage U0The second value is 50V, and the obtained value is converted into times value to obtain U0 times, the calculation result is as follows:
Figure BDA0002292565210000061
as the discharge gap of the neutral point of the transformer is 110mm or 120mm, the power frequency withstand voltage of the neutral point of the transformer shown in Table 1 is 52kV or 53.3kV, and the maximum steady-state voltage of the neutral point of the actual transformer is about 55kV and higher than the power frequency withstand voltage value, the discharge gap can be punctured.
1.2110 kV line broken line 2
1.2.1110 kV line broken wire
Fig. 7 is a schematic diagram II of a 110kV disconnection subsystem, wherein a system side 220kV substation 110kV side is an effective grounding system, and a load side 110kV substation transformer 110kV neutral point is grounded.
The electric potentials of the 110kV side power supplies of the 220kV transformer substation on the system side are respectively set as EA、EB、EC. When a certain part of the 110kV line is broken, such as phase A, 110kV bus electricity of a 110kV transformer substation at a load side is obtained through analysisThe pressing is as follows:
Figure BDA0002292565210000062
(2) in the formula of UA、UB、UCThe voltage of A phase, B phase and C phase of 110kV bus of 110kV transformer substation at load side is U phase0Is 110kV neutral point voltage of 110kV transformer substation on load side, 3U0The voltage of a secondary open-delta winding of a 110kV bus voltage transformer (PT for short) of a load side 110kV substation transformer is obtained. The vector diagrams are shown in FIGS. 8 and 9.
When a 110kV line is broken, the voltage of the 110kV bus at the 220kV substation on the system side is E, and the voltage of the A phase, the voltage of the B phase and the voltage of the C phase are respectively EA、EB、EC,3U0Is 0, i.e. the three-phase voltage is maintained under normal conditions.
1.2.2110 kV line disconnection and load side disconnection grounding
Fig. 7 is a schematic diagram II of a 110kV broken line and load side broken line grounding secondary system, wherein a system side 220kV substation 110kV side is an effective grounding system, and a load side 110kV substation transformer 110kV neutral point is grounded.
The electric potentials of the 110kV side power supplies of the 220kV transformer substation on the system side are respectively set as EA、EB、EC. When a certain broken line of the 110kV line is disconnected and the broken line of the load side is grounded, such as phase A, analyzing: eB、ECThe synthetic potential at the low-voltage side of the 110KV transformer substation transformer at the load side is-EaThe potential is added to a low-voltage a-phase winding of a 110kV transformer substation at the load side and is converted into a low-voltage A-phase winding of the 110kV transformer at the winding with the potential of-EAGrounding the broken line of the 110kV line and the broken line of the load side to form an A-phase short circuit and an A-phase short circuit current IAThe current of the low-voltage a-phase winding of the transformer is converted into IaThe a-phase winding current is IaForming a circulating current in a low-voltage side winding of the transformer, wherein the current of the a-phase winding is IbPhase C winding current IcThe current of the high-voltage B-phase winding of the transformer is converted into IBC phase winding current is ICDue to Ia、Ib、IcThe currents are equal and in phase, so that I isA、IB、ICThe currents are equal and in phase.
When the 110kV line is broken and the broken line of the transformer side is grounded, for the system side, the fault is mainly reflected in a short-circuit fault, and the zero-sequence current 3I of the system side0=(IB+IC)/3)=2IBAnd 3, therefore, the 110kV line protection of the 220kV transformer substation starts tripping to remove the fault (the 110kV line breaker trips to remove the fault, the 110kV line breaker is overlapped, then the 110kV line single-phase grounding short-circuit fault occurs, and the 110kV line protection of the 220kV transformer substation starts tripping again to remove the fault).
1.2.3110 kV line disconnection and system side disconnection point grounding
When the 110kV line is broken and the broken line of the system side is grounded, for the system side, the fault is mainly reflected in the single-phase grounding short-circuit fault of the 110kV line, so that the 110kV line protection of the 220kV transformer substation can start tripping to remove the fault (the 110kV line breaker trips to remove the fault, the 110kV line breaker is overlapped, then the single-phase grounding short-circuit fault of the 110kV line, the 110kV line protection of the 220kV transformer substation restarts tripping and removes the fault).
Analysis of 2.110kV line breaking result
2.1110 kV line break (or and earthing at break)
For three conditions of 1.1.1, 1.1.2 and 1.2.1, 110kV line disconnection protection can be carried out, and load transfer of 110kV line disconnection can be eliminated by matching with the backup power automatic switch, so that the influence of 110kV line disconnection on power supply load can be prevented.
Short circuit caused by 2.2110 kV line disconnection and grounding at disconnection
For three conditions of 1.1.3, 1.2.2 and 1.2.3, because short-circuit fault is caused by grounding at a broken line, tripping can be started by 110kV line protection of a 220kV transformer substation to remove the fault (110kV line breaker tripping removes the fault, 110kV line breaker is overlapped, then 110kV line single-phase grounding short-circuit fault, 220kV transformer substation 110kV line protection restarts tripping again to remove the fault); because the 110kV bus corresponding to the 110kV transformer substation at the load end loses power, the load transfer of 110kV line disconnection is eliminated by the spare power automatic switching action, and the influence of the 110kV line disconnection on the power supply load is prevented.
Fault feature analysis during disconnection of 3.110kV line
For three 110kV line disconnection conditions of 1.1.1, 1.1.2 and 1.2.1, the fault characteristics are as follows: the three-phase voltage of the 110kV bus A, B, C on the power supply side is symmetrical, the amplitude and the phase are not changed greatly, and the voltage is 3U0Is 0, but for 2 kinds of 110kV line disconnection conditions of 1.1.1 and 1.1.2, the fault characteristics are as follows: the three-phase voltage of the 110kV bus A, B, C of the load side transformer substation is asymmetrical, and the phase voltage of the broken line is-E A2 and about 0, 3U0is-3EA/2 or-EAMeanwhile, the amplitude and the phase of the non-fault phase voltage do not change much; there is a potential for breakdown of the transformer neutral. 1.2.1 the fault signature of a broken 110kV line is similar to the case of 1.1.2, where the phase voltage of the broken line is equal to 0.
An example of the method of the present invention is given below (taking fig. 12 as an example).
Fig. 12 shows that the 110kV single bus segment secondary main connection structure of the 110kV substation is:
the No. 1 power supply incoming line branch equipment and the No. 2 power supply incoming line branch equipment are respectively connected with a 110kV I section bus and a 110kV II section bus; a segmented circuit breaker 3DL is arranged between the first segment bus and the second segment bus of 110kV, and is connected with a segmented current transformer CT in series; the No. 1 power supply inlet line branch circuit spacing equipment is a circuit breaker 1DL and is connected with a current transformer CT1 in series; the No. 2 power supply inlet wire branch circuit spacing device is a circuit breaker 2DL and is connected with a current transformer CT2 in series; the 110kV I-section bus is also connected with a No. 1 transformer branch, a No. 2 transformer branch, a No. 1 110kV outgoing line branch and a 110kV I-section bus voltage transformer PT 1; the 110kV II-section bus is also connected with a No. 3 transformer branch, a No. 2 110kV outgoing line branch and a 110kV II-section bus voltage transformer PT 2. There is circuit breaker 4DL No. 1 power inlet wire circuit power supply side, and there is circuit breaker 5DL No. 2 power inlet wire circuit power supply side. The 110kV buses of the power supply end are respectively connected with 110kV PT1 and 110kVPT 2. A110 kV spare power automatic switching device is arranged on the 110kV side of a 110kV substation at a load end. The 110kV line is provided with an optical fiber channel and line optical fiber differential protection.
Aiming at the 110kV single-bus subsection -time main connection, voltage information on two sides of a line is transmitted through a 110kV line optical fiber channel in a power supply end 220kV transformer substation, the voltage on the two sides of the line is compared to identify the disconnection of the 110kV line, and the load end 110kV transformer substation adopts a scheme of switching on and off loop operation to transfer load power supply to meet the field operation requirement.
The invention relates to kinds of 110kV line disconnection relay protection methods for comparing voltages at two sides of a line, which comprises the following steps as shown in figure 11:
, judging the condition of tripping on the incoming line breaker after the 110kV line is broken and the load end of the 110kV substation is closed
1.1 conditions for judging 2DL or 3DL of 1 # 110kV line disconnection on-load end 110kV substation standby circuit breaker and 1DL of 1 # trip incoming line circuit breaker at 1 kV line disconnection on-load end, and starting 1 # 110kV line disconnection alarm condition
a. Collecting 110kV bus PT secondary A-phase voltage U corresponding to 110kV transformer substation at power supply endaPhase U of B phase voltagebC phase voltage Uc Open delta voltage 3Uo
(1) PT secondary B phase voltage value U of power supply end corresponding to 110kV busaGreater than the setting value U1;
(2) PT secondary C-phase voltage value U of power supply end corresponding to 110kV busbGreater than the setting value U1;
(3) PT secondary A-phase voltage value U of 110kV bus corresponding to power supply endcGreater than the setting value U1;
(4) secondary voltage value 3U of power supply end corresponding to secondary opening triangle of bus PToIs less than the setting value U2;
(5) a power end 110kV line circuit breaker 4DL of a No. 1 110kV line is at a switching-on position;
when the conditions are all met, the voltage of a 110kV bus corresponding to a power end 110kV transformer substation is normal, and the normal voltage signal is transmitted to 110kV disconnection protection in 110kV line protection of a No. 1 110kV transformer substation under the load of the No. 1 110kV line through an optical fiber channel of No. 1 110kV power line optical fiber differential protection;
b. collection load end 110kV transformer substation I section bus PT secondary A phase voltage UaPhase U of B phase voltagebC phase voltage Uc Open delta voltage 3Uo
(1) The PT secondary voltage value of the 110kV bus at the No. 1 110kV line open-circuit phase load end is lower than a setting value U3;
(2) the PT secondary voltage value of the 110kV bus at the 1 # 110kV line non-broken line phase 1 load end is greater than a setting value U1;
(3) the PT secondary voltage value of the 110kV bus at the No. 1 110kV line non-broken line phase 2 load end is greater than a setting value U1;
(4) the PT opening triangular secondary voltage value of the No. 1 110kV bus at the load end of the 110kV line is greater than a setting value U4;
(5) a load end 110kV line breaker 1DL of a No. 1 110kV line is at a switching-on position;
when the conditions are met, the abnormal voltage of the I section of the bus of the 110kV transformer substation at the load end is represented;
when the received power end 110kV transformer substation corresponds to a normal 110kV bus and the voltage of a first-section bus of the load end 110kV transformer substation is abnormal, identifying and judging that a No. 1 110kV power line is broken, delaying by t1 to protect the 110kV broken line in the protection of the 110kV line of the load end 110kV transformer substation, and after closing a standby power circuit breaker 2DL or 3DL, tripping off a circuit breaker 1DL on the load side of the No. 1 110kV power line to enable a transformer which loses power to be recovered to the standby power line for power supply; simultaneously starting a No. 1 110kV line disconnection alarm;
1.2 conditions for judging 1DL or 3DL of standby circuit breaker of No. 2 110kV line disconnection on-load end 110kV transformer substation and 2DL of tripping-off No. 2 incoming line circuit breaker, and conditions for starting No. 2 110kV line disconnection alarm
a. Collecting 110kV bus PT secondary A-phase voltage U corresponding to 110kV transformer substation at power supply endaPhase U of B phase voltagebC phase voltage Uc Open delta voltage 3Uo
(1) The voltage value of the PT secondary B phase of the 110kV bus corresponding to the power supply end is greater than a setting value U1;
(2) the PT secondary C-phase voltage value of the power supply end corresponding to the 110kV bus is greater than a setting value U1;
(3) the voltage value of a PT secondary A phase of a 110kV bus corresponding to a power supply end is greater than a setting value U1;
(4) the secondary voltage value 3UO of the secondary opening triangle of the power supply end corresponding to the bus PT is smaller than the setting value U2;
(5) a power end 110kV line circuit breaker 5DL of a No. 2 110kV line is at a switching-on position;
the conditions are all met, and the condition indicates that the 110kV bus voltage corresponding to the 110kV transformer substation at the power end is normal; the normal voltage signal is transmitted to a 110kV disconnection protection in 110kV line protection of a load 110kV transformer substation of a No. 2 110kV line through an optical fiber channel of the No. 2 110kV power line optical fiber differential protection;
b. collecting PT secondary A-phase voltage U of II-section bus of 110kV transformer substation at load endaPhase U of B phase voltagebC phase voltage Uc Open delta voltage 3Uo
(1) The secondary voltage value of a No. 2 110kV line open-circuit phase load end 110kV bus PT is lower than a setting value U3;
(2) the PT secondary voltage value of the 110kV bus at the non-broken line phase 1 load end of the No. 2kV line is greater than a setting value U1;
(3) the secondary voltage value 3UO of the 110kV bus PT at the non-broken line phase 2 load end of the No. 2kV line is greater than the setting value U1;
(4) the PT opening triangular secondary voltage value of the No. 2 110kV line load end 110kV bus is greater than a setting value U4;
(5) a 110kV line breaker 1DL at a load end of a No. 2 110kV line is at a switching-on position;
when the conditions are met, the voltage abnormality of the second section of the bus of the 110kV transformer substation at the load end is represented;
when the received power end 220kV transformer substation corresponding to a 110kV bus is normal and the voltage of a second-section bus of the load end 110kV transformer substation is abnormal, identifying and judging that a No. 2 110kV power line is broken, delaying by t1 to protect the 110kV broken line in the protection of the 110kV line of the load end 110kV transformer substation, and after closing a standby power circuit breaker 2DL or 3DL, tripping off a circuit breaker 1DL on the load side of the No. 1 110kV power line to enable a transformer without a power supply to be recovered to the standby power line for power supply; and simultaneously, the No. 2 110kV line disconnection alarm is started.
1.3 in the above 1.1 and 1.2, the control method of 110kV line disconnection identification for comparing voltages at two sides of a 110kV power line is adopted, and is not only suitable for the 110kV neutral point ungrounded mode of the transformer, but also suitable for the 110kV neutral point grounded mode of the transformer.
The reason that the circuit breakers 1DL or 2DL and 4DL or 5DL on the two sides of the incoming line of the 110kV power supply are arranged at the switching-on position is that when power incoming lines are provided with load ends of a 110kV substation, the bus voltage far away from the incoming lines of the power supply can also sense the information of the line disconnection, and the action behavior of the device can be interfered, in addition, when a line PT is adopted, the incoming line of the power supply can also have other load ends of the 110kV substation, if the incoming line circuit breaker of the 110kV substation is tripped slowly or refuses to trip, the action behavior of the device can also be interfered, and the condition that the circuit breakers on the two sides of the incoming line of the 110kV power supply are arranged at the switching-on position can be used for .
2. The 110kV neutral point operation mode of the main transformer on the I section or II section of the bus of the load end 110kV transformer substation is as follows: a) grounding; b) not grounded, grounded through the gap; the 110kV side is provided with a 110kV spare power automatic switching device. No. 1 and No. 2 power supply 110kV lines are required to be provided with fiber channels and line fiber differential protection.
3. The method is implemented in a single 110kV line disconnection protection device of a load end 110kV transformer substation or in a 110kV line protection device; the 110kV line protection device implemented in the 110kV transformer substation at the load end has the advantages that: no additional hardware devices are required.
The secondary setting value of the 110kV I section bus or II section bus broken line phase PT of the 4-load end 110kV transformer substation is as follows:
(1) load end 110kV bus PT secondary A phase voltage value UaPhase voltage value U of B phasebC phase voltage value UcThe setting value is as follows: the rated phase voltage value is less than or equal to 0.5 and is 1.1 times, namely 31.9V. Note: no more than 0.5 × 58 × 1.1 ═ 31.9V
(2) The voltage setting value of the PT opening triangle of the 110kV bus is as follows: take 0.9 times the rated line voltage value. Taking 90V, and injecting: 0.9 × 100V ═ 90V;
the secondary PT setting value of the 110kV bus of the power supply end 110kV transformer substation when the 4110 kV line is disconnected is as follows:
(1) PT secondary A-phase voltage value U of power supply end 110kV busaPhase voltage value U of B phasebC phase voltage value UcThe setting value is as follows: the phase rated voltage value is not more than 90 percent, namely not more than 52.2V. (Note) 58V 0.9 ═ 52.2V
(2) The voltage setting value of the PT opening triangle of the 110kV bus is as follows: when the voltage value is larger than the unbalanced voltage value in normal operation, taking 4-8V; for example, it may be 5V.
5, the setting value of the time in the single-phase disconnection relay protection method for transferring power supply by adopting ring closing and opening operation in the load end 110kV transformer substation is as follows:
the t1 time is set as: three-phase different-period time when the switch is closed is avoided: taking for 0.1-0.2 seconds;
6. the inventive solution can be used in the following cases: (1) the 110kV neutral point operation mode of all transformers of a load end 110kV transformer substation is as follows: a) grounding; b) not grounded, grounded through the gap; (2) a spare power automatic switching device is arranged on the 110kV side of the 110kV transformer substation; (3) no. 1 and No. 2 power supply 110kV lines are required to be provided with fiber channels and line fiber differential protection.
The cable can meet -time main connection of (1)110kV single bus segment -time main connection of a 110kV transformer substation, (2)110kV inner bridge -time main connection of the 110kV transformer substation, (3)110kV expansion -time main connection of the 110kV transformer substation, (4)110kV line transformer group -time main connection of the 110kV transformer substation, (5)110kV line transformer group -time main connection, and (6) other -time main connection.
7. If the 110kV transformer substation adopts -time main wiring of a 110kV line transformer group, a standby breaker on the high-low voltage side of the 110kV transformer which closes and opens the broken line is adopted on the low-low voltage side of the load side transformer substation, and the power supply task is recovered.
8. For a 110kV line with branch lines, 110kV line breakage protection of pairwise correspondence between power end-load end substations needs to be implemented between the power end substation and each load end substations.
9. The scheme of the invention can also be used in the case of the disconnection of a 220kV line powered by a single power supply.
An embodiment of the method of the present invention is given below, taking fig. 12 as an example, and the operation mode of the transformer 110kV neutral point is as follows: not grounded, grounded through the gap;
1 operating mode 1
Under this operational mode, 2DL of No. 2 power circuit breaker, the operation of segmentation circuit breaker 3DL, 1DL of No. 1 power circuit breaker is hot standby, 1DL of No. 1 power circuit breaker branch floodgate position promptly.
No. 1.12 110kV power line single-phase line break fault
The method is characterized in that the phase A is broken, the phase B or the phase C is broken similarly, when the phase A of the No. 2 110kV power line has a phase A single-phase broken fault, the phase A is equivalent to a load-carrying disconnecting switch, an electric arc is generated at the moment of line breaking, the electric arc cannot be extinguished, the electric arc advances in steps to cause the phase A of the line to be grounded, the phase A broken part of the No. 2kV power line disappears and is successfully superposed through the circuit breaker 5DL at the power supply side of the No. 2kV power line because the distance between the phase A and the phase II of the superior No. 2 power line is within the protection range of the phase I or the phase II of the superior No. 2kV power line of a superior No. 2kV power substation, but the phase II bus of the load-side substation is in a phase loss state, the secondary voltage PT of the power supply terminal 110kV power substation is normal, the condition that the phase A of the No. 2kV power line is broken is lost is met, after the time delay t1, the condition that the phase A of the power line in the line protection circuit breaker is successful, the phase B is broken, the phase B or the phase B is broken, the phase B or C of the B is similar to the line, the phase B, the.
2 operating mode 2
Under this operational mode, 1DL of power breaker, 3DL operation of section circuit breaker, 2 # power breaker 2DL are hot standby, 2 # power breaker 2DL separating brake position promptly.
No. 2.11 110kV power line single-phase line break fault
The method is characterized in that an A-phase disconnection is taken as an example, B-phase or C-phase disconnection is similar, when the A-phase single-phase disconnection of the No. 1 110kV power supply circuit has a fault, the method is equivalent to that a load pulls an isolating switch, an electric arc is generated at the moment of disconnection, the electric arc cannot be extinguished, the electric arc enters steps to cause the A-phase single-phase grounding of the circuit, the fault at the A-phase disconnection position of the No. 1 110kV power supply circuit is disappeared after the I-section or II-section protection starting action of the upper-stage No. 1 No. 110kV power supply circuit is carried out in the protection range of the upper-stage power supply circuit from the I-section or II-section protection to jump off the circuit breaker 4DL at the power supply side of the No. 1 kV power supply circuit, the fault is successfully superposed after the I-section bus voltage induction of the No. 1 kV power supply circuit is in the delayed mode of the No. 1 110kV power supply circuit, the I-section bus voltage induction of the load-side transformer substation runs in a phase failure mode, the power supply terminal 110kV bus is normal, the condition that the No. 1 kV power supply circuit single-phase disconnection of the No. 110kV power supply circuit is satisfied, after the delayed time t1, the 110kV power supply circuit is disconnected, the standby transformer is started, the.
3 operating mode 3
Under this operational mode, 1DL of No. 1 power circuit breaker, 2DL of No. 2 power circuit breaker operate, and the hot reserve of section circuit breaker 3DL, section circuit breaker 3DL separating brake position promptly.
No. 3.11 110kV power line single-phase line break fault
The method is characterized in that the phase A is broken, the phase B or the phase C is broken similarly, when the phase A of the 110kV power line 1 breaks, the method is equivalent to that a load pulls an isolating switch, electric arcs are generated at the moment of breaking, the electric arcs cannot be extinguished, the step of of the electric arcs is carried out to cause the phase A of the line to be grounded, the phase A of the line is broken, the distance I or II of the upper-level 110kV power line is protected and started to jump off a circuit breaker 4DL at the power supply side of the upper-level 1 kV power line in a protection range of the distance I or II of the upper-level power line, when a load end substation loses power, the phase A of the 110kV power line is broken, the circuit breaker 4DL is successfully superposed through a delay 1 110kV power line, the phase I bus voltage of the load end substation is sensed to run in an open phase, the secondary voltage of a power supply terminal substation 110kV bus PT is normal, the condition that the phase A of the 1 kV power line is broken is met, after the delay t1, the phase A of the line of the load end line is broken, the protection, the circuit breaker is started, the standby power supply substation 110kV bus is switched on, the phase B breaker is switched on the standby power supply substation, the.
No. 3.22 110kV power line single-phase line break fault
The method is characterized in that an A-phase broken line is taken as an example, B-phase or C-phase broken line is similar, when the A-phase single-phase broken line of the No. 2 110kV power supply circuit has a fault, the method is equivalent to that an isolating switch is pulled with a load, an electric arc is generated at the moment of broken line, the electric arc cannot be extinguished, the electric arc enters steps to cause the A-phase single-phase grounding of the circuit, the fault at the A-phase broken line of the No. 2kV power supply circuit is disappeared when the distance I or II of the superior No. 2 110kV power supply circuit is protected and started to jump off a circuit breaker 5DL at the power supply side of the superior No. 2 power supply circuit within the protection range of the superior No. 2 power supply circuit from the I section or II section, after a 110kV substation 110kV II bus loses power supply, the condition 1 that the A-phase broken line of the 110kV power supply circuit is successfully superposed through delay of the circuit breaker 5DL at the No. 2kV power supply side, but the voltage induction of the II-section bus of the load terminal 110kV substation 110kV power supply station runs in a phase, the PT secondary voltage meets the condition 1 that the 110kV power supply circuit single-phase broken line identifying the 110kV single-phase broken line is established, and the switch-phase broken line of the.
Single-phase line break fault of No. 2.22 110kV power line
The method is characterized in that an A-phase disconnection is taken as an example, B-phase or C-phase disconnection is similar, when the A-phase single-phase disconnection of the No. 2 110kV power line fails, the method is equivalent to that a load pulls an isolating switch, electric arcs are generated at the moment of disconnection, the electric arcs cannot be extinguished, the electric arcs enter steps to cause the A-phase single-phase grounding of the line, the A-phase disconnection of the No. 2 power line is broken in a protection range of a first section or a second section of a previous power line, so that the first section or the second section of the previous power line is protected and started or an optical fiber differential protection action jumps away from a circuit breaker 5DL on the load side of the No. 2 power line, when a second section of a load-side transformer substation loses power, the fault of the A-phase disconnection of the No. 2kV power line disappears, the circuit breaker 5DL is successfully superposed by delaying the 2-kV power line load-side circuit, but the second section of the load-side transformer substation is subjected to phase-loss operation, the secondary voltage of the 110kV bus is normal, the condition that the A-phase disconnection of the No. 2kV power line of the No. 110kV power line is met, after the delaying t1, the 110kV power line is broken, the 110kV power.
In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.

Claims (3)

1, kinds of 110kV circuit disconnection relay protection method of comparing voltage on two sides of circuit, characterized by comprising:
, condition for judging whether the 110kV line is broken and the load end of the 110kV substation is closed or not after the breaker is tripped, 1.1 condition for judging whether the 1 # 110kV line is broken and the load end of the 110kV substation is closed or not and whether the 1 # 110kV line is tripped or not, 2DL or 3DL of the breaker is switched on or not, and 1 # 110kV line breakage alarm condition for starting
a. Collecting 110kV bus PT secondary A-phase voltage U corresponding to 110kV transformer substation at power supply endaPhase U of B phase voltagebC phase voltage UcOpen delta voltage 3Uo
(1) PT secondary B phase voltage value U of power supply end corresponding to 110kV busaGreater than the setting value U1;
(2) PT secondary C-phase voltage value U of power supply end corresponding to 110kV busbGreater than the setting value U1;
(3) PT secondary A-phase voltage value U of 110kV bus corresponding to power supply endcGreater than the setting value U1;
(4) secondary voltage value 3U of power supply end corresponding to secondary opening triangle of bus PToIs less than the setting value U2;
(5) a power end 110kV line circuit breaker 4DL of a No. 1 110kV line is at a switching-on position;
when the conditions are all met, the voltage of a 110kV bus corresponding to a power end 110kV transformer substation is normal, and the normal voltage signal is transmitted to 110kV disconnection protection in 110kV line protection of a No. 1 110kV transformer substation under the load of the No. 1 110kV line through an optical fiber channel of No. 1 110kV power line optical fiber differential protection;
b. collection load end 110kV transformer substation I section bus PT secondary A phase voltage UaPhase U of B phase voltagebC phase voltage UcOpen delta voltage 3Uo
(1) The PT secondary voltage value of the 110kV bus at the No. 1 110kV line open-circuit phase load end is lower than a setting value U3;
(2) the PT secondary voltage value of the 110kV bus at the 1 # 110kV line non-broken line phase 1 load end is greater than a setting value U1;
(3) the PT secondary voltage value of the 110kV bus at the No. 1 110kV line non-broken line phase 2 load end is greater than a setting value U1;
(4) the PT opening triangular secondary voltage value of the No. 1 110kV bus at the load end of the 110kV line is greater than a setting value U4;
(5) a load end 110kV line breaker 1DL of a No. 1 110kV line is at a switching-on position;
when the conditions are met, the abnormal voltage of the I section of the bus of the 110kV transformer substation at the load end is represented;
when the received power end 110kV transformer substation corresponds to a normal 110kV bus and the voltage of a first-section bus of the load end 110kV transformer substation is abnormal, identifying and judging that a No. 1 110kV power line is broken, delaying by t1 to protect the 110kV broken line in the protection of the 110kV line of the load end 110kV transformer substation, and after closing a standby power circuit breaker 2DL or 3DL, tripping off a circuit breaker 1DL on the load side of the No. 1 110kV power line to enable a transformer which loses power to be recovered to the standby power line for power supply; simultaneously starting a No. 1 110kV line disconnection alarm;
1.2 conditions for judging 1DL or 3DL of standby circuit breaker of No. 2 110kV line disconnection on-load end 110kV transformer substation and 2DL of tripping-off No. 2 incoming line circuit breaker, and conditions for starting No. 2 110kV line disconnection alarm
a. Collecting 110kV bus PT secondary A-phase voltage U corresponding to 110kV transformer substation at power supply endaPhase U of B phase voltagebC phase voltage UcOpen delta voltage 3Uo
(1) The voltage value of the PT secondary B phase of the 110kV bus corresponding to the power supply end is greater than a setting value U1;
(2) the PT secondary C-phase voltage value of the power supply end corresponding to the 110kV bus is greater than a setting value U1;
(3) the voltage value of a PT secondary A phase of a 110kV bus corresponding to a power supply end is greater than a setting value U1;
(4) the secondary voltage value 3UO of the secondary opening triangle of the power supply end corresponding to the bus PT is smaller than the setting value U2;
(5) a power end 110kV line circuit breaker 5DL of a No. 2 110kV line is at a switching-on position;
the conditions are all met, and the condition indicates that the 110kV bus voltage corresponding to the 110kV transformer substation at the power end is normal; the normal voltage signal is transmitted to a 110kV disconnection protection in 110kV line protection of a load 110kV transformer substation of a No. 2 110kV line through an optical fiber channel of the No. 2 110kV power line optical fiber differential protection;
b. collecting PT secondary A-phase voltage U of II-section bus of 110kV transformer substation at load endaPhase U of B phase voltagebC phase voltage UcOpen delta voltage 3Uo
(1) The secondary voltage value of a No. 2 110kV line open-circuit phase load end 110kV bus PT is lower than a setting value U3;
(2) the PT secondary voltage value of the 110kV bus at the non-broken line phase 1 load end of the No. 2kV line is greater than a setting value U1;
(3) the secondary voltage value 3UO of the 110kV bus PT at the non-broken line phase 2 load end of the No. 2kV line is greater than the setting value U1;
(4) the PT opening triangular secondary voltage value of the No. 2 110kV line load end 110kV bus is greater than a setting value U4;
(5) a 110kV line breaker 1DL at a load end of a No. 2 110kV line is at a switching-on position;
when the conditions are met, the voltage abnormality of the second section of the bus of the 110kV transformer substation at the load end is represented;
when the received power end 220kV transformer substation corresponding to a 110kV bus is normal and the voltage of a second-section bus of the load end 110kV transformer substation is abnormal, identifying and judging that a No. 2 110kV power line is broken, delaying by t1 to protect the 110kV broken line in the protection of the 110kV line of the load end 110kV transformer substation, and after closing a standby power circuit breaker 2DL or 3DL, tripping off a circuit breaker 1DL on the load side of the No. 1 110kV power line to enable a transformer without a power supply to be recovered to the standby power line for power supply; and simultaneously, the No. 2 110kV line disconnection alarm is started.
2. The 110kV line disconnection relay protection method for comparing voltages at two sides of a line as claimed in claim 1, wherein:
setting value U1 is 0.9Ea, Ea is a phase voltage value, and the corresponding PT secondary voltage is 58V; 0.9 Ea-52.2V; setting value U2 is between 4 and 8V; the setting value U3 is 0.55Ea, namely 31.9V; setting value U4 is 0.9Eab, which is PT secondary opening triangle rated voltage value, and Eab is 100V.
3. The 110kV line disconnection relay protection method for comparing voltages at two sides of a line as claimed in claim 1, wherein: and setting the t1 time to avoid three-phase different-phase time when the switch is closed, and taking 0.1-0.2 second.
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