CN109861181B - Relay protection method for eliminating dead zone faults of sectional and bus-coupled circuit breakers - Google Patents
Relay protection method for eliminating dead zone faults of sectional and bus-coupled circuit breakers Download PDFInfo
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- CN109861181B CN109861181B CN201910261124.8A CN201910261124A CN109861181B CN 109861181 B CN109861181 B CN 109861181B CN 201910261124 A CN201910261124 A CN 201910261124A CN 109861181 B CN109861181 B CN 109861181B
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Abstract
The invention discloses a relay protection method for eliminating dead zone faults of a sectional and bus-coupled circuit breaker, which is applied to a power transmission and distribution network and aims at the relay protection for eliminating the dead zone faults of the sectional or bus-coupled circuit breaker by using single bus sectional wiring or double bus wiring of a substation. The invention can accurately act and remove the fault. The scheme of the invention is suitable for: (1) a 110kV single bus subsection primary main wiring of a 110kV substation; (2) a 110kV double-bus primary main wiring of a 220kV substation; (3)110kV single-bus subsection primary main wiring of a 220kV substation.
Description
Technical Field
The invention relates to a relay protection method for eliminating dead zone faults of a sectional breaker and a bus tie breaker, and belongs to the technical field of power transmission and distribution network control.
Background
In a single-bus sectionalized wiring or double-bus wiring substation, a current transformer is usually installed only on one side of a sectionalizing circuit breaker or a bus tie circuit breaker, which causes a dead zone fault (a fault between the sectionalizing circuit breaker or the bus tie circuit breaker and the current transformer of the sectionalizing circuit breaker or the bus tie circuit breaker) of the sectionalizing circuit breaker or the bus tie circuit breaker. A sectionalizer or a bus tie breaker has a dead zone fault, which makes the fault removal difficult. At present, a general method adopted for dead zone faults of a sectionalizing circuit breaker or a bus tie circuit breaker is a 'CT (computed tomography) scheme': and after the busbar differential protection action jumps the dead zone of the non-fault section bus circuit breaker, the sectional circuit breaker or the bus-coupled circuit breaker, the fault of the dead zone of the sectional circuit breaker or the bus-coupled circuit breaker is judged, and the secondary current of a current transformer of the sectional circuit breaker or the bus-coupled circuit breaker is withdrawn to participate in differential current calculation of the fault section bus small differential element. The invention provides a relay protection technical scheme for eliminating the dead zone fault of a sectionalized or bus-coupled circuit breaker for single bus sectionalized wiring or double bus wiring of a substation.
Disclosure of Invention
The invention aims to provide a relay protection method for eliminating dead zone faults of a sectional and bus-coupled circuit breaker, which is applied to a power transmission and distribution network and aims at the relay protection for eliminating the dead zone faults of the sectional (bus-coupled) circuit breaker for single bus sectional wiring or double bus wiring of a substation.
The purpose of the invention is realized by the following technical scheme:
a relay protection method for eliminating dead zone faults of a sectional breaker and a bus tie breaker comprises the following steps:
1. the bus differential protection action control of the I-section bus breaker is as follows:
1.1 blocking Condition 1:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) a 110kV bus differential I section bus small differential relay containing sectional current acts;
(3) the 110kV bus differential large differential relay acts;
when the conditions are met, the bus differential protection action jumps the I section bus circuit breaker;
1.2 blocking Condition 2:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) a 110kV bus differential I section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the sectional breaker is at the opening position;
when the conditions are met, the bus differential protection action jumps the I section bus circuit breaker;
1.3 blocking Condition 3:
1.3.1 output T time open signal:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus difference II-section bus small differential relay with sectional current acts;
(3) the 110kV bus differential large differential relay acts;
when the conditions (1) to (3) are all met, outputting a T time open signal;
1.3.2 latch-up conditions:
(1) when any condition of the conditions (1) to (3) of the 1.3.1 is not met, namely a 110kV bus differential II section bus small differential relay or a 110kV bus differential large differential relay or a 110kV II section bus composite voltage element is changed from the original action to return;
(2) there is an output T time open signal;
(3) when the section breaker is changed from the switching-on position to the switching-off position;
(4) the 110kV bus differential II-section bus small differential relay without sectional current does not act;
(5) the 110kV I section bus composite voltage is locked and opened;
(6) the 110kV bus differential large differential relay acts;
(7) the phase current element of the segmented CT exceeds a setting value, or the zero-sequence current element exceeds the setting value;
when the conditions (1) to (7) are all met, after delay time t1, the bus differential protection action jumps to a first-section bus breaker;
1.4 blocking Condition 4:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) the spare power automatic switching starts a No. 1 power incoming line breaker 1DL to switch on;
(4) the No. 1 power incoming line breaker 1DL is changed from an opening position to a closing position;
(5) the phase current element of the inlet wire of the No. 1 power supply exceeds a setting value, or the zero-sequence current element exceeds the setting value;
when the conditions (1) - (5) are all met, the bus differential protection action jumps the I-section bus circuit breaker;
2. the control of the bus differential protection action tripping II-section bus circuit breaker is as follows:
2.1 blocking Condition 1:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus difference II-section bus small differential relay with sectional current acts;
(3) the 110kV bus differential large differential relay acts;
when the conditions are met, tripping the second-section bus circuit breaker by the bus differential protection action;
2.2 blocking Condition 2:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus differential II-section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the sectional breaker is at the opening position;
when the conditions are met, tripping the second-section bus circuit breaker by the bus differential protection action;
2.3 blocking Condition 3:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) the spare power automatic switching starts a No. 2 power incoming line breaker 2DL to switch on;
(4) the No. 2 power incoming line breaker 2DL is changed from an opening position to a closing position;
(5) the phase current element of the inlet wire of the No. 2 power supply exceeds a setting value, or the zero-sequence current element exceeds the setting value;
when the conditions (1) - (5) are all met, tripping the second-section bus circuit breaker by the bus differential protection action;
3. the control of the closing of the bus differential protection action locking section breaker is as follows:
3.1 blocking Condition 1:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) a 110kV bus differential I section bus small differential relay containing sectional current acts;
when the conditions are met, the bus differential protection action jumps the sectional breaker;
3.2 blocking Condition 2:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) a 110kV bus difference II-section bus small differential relay with sectional current acts;
when the conditions are met, the bus differential protection action jumps the sectional breaker;
3.3 blocking Condition 3:
(1) the 110kV bus differential large differential relay acts;
(2) the composite voltage of the 110kV I section bus is locked and unlocked or the composite voltage of the 110kV II section bus is locked and unlocked;
and when the conditions are met, the bus differential protection action jumps the sectional breaker.
The object of the invention can be further achieved by the following technical measures:
according to the relay protection method for eliminating the dead zone faults of the sectional and bus-tie circuit breakers, the T time in the output T time opening signal is 200-300 milliseconds; the delay time t1 takes 20-40 milliseconds.
According to the relay protection method for eliminating the dead zone fault of the sectional and bus-coupled circuit breakers, the setting and requirements of related protection in the locking conditions 1 and 2 are as follows:
in the locking conditions 1 and 2, the phase current element fixed value of the subsection or the inlet wire of the No. 1 power supply or the inlet wire of the No. 2 power supply is set according to the maximum short-circuit current which flows through the protection when the middle and low-voltage buses of the transformer substation on the local substation or the 110kV outlet line are short-circuited:
(1) in the formula (I), the compound is shown in the specification,
the maximum short-circuit current K of the protection flows when the middle and low-voltage buses of the maximum transformer of the substation or the substation on a 110kV outgoing line are short-circuited in the maximum operation mode of the systemkTaking 1.3-1.5 as a reliable coefficient;
the zero sequence current element fixed value of the section or No. 1 power supply inlet wire has sensitivity setting more than or equal to 1.5 times according to the minimum operation mode of the system for 110kV bus single-phase earth fault:
(2) in the formula (I), the compound is shown in the specification,
is 110kV bus single-phase short-circuit current in the minimum operation mode of the system, KlmTaking 1.5 as a sensitivity coefficient;
phase current elements of a segmented or No. 1 power supply inlet wire or No. 2 power supply inlet wire adopt phase currents of an A phase, a B phase and a C phase;
the phase current element and the zero sequence current element of No. 1 power supply incoming line or No. 2 power supply incoming line are required to be provided with a direction element, and the direction element points to: pointing from the line to the bus bar.
According to the relay protection method for eliminating the dead zone faults of the sectional and bus-tie circuit breakers, the requirements for configuration and setting of the power supply side line protection of the superior transformer substation are as follows:
the protection configuration requirements of the power supply side line of the upper-level transformer substation are as follows:
the power supply circuit of the superior transformer substation is provided with optical fiber current differential protection, phase distance I-III section protection, grounding distance I-III section protection, zero sequence current I-III section protection and reclosing;
when the power line is a short line less than or equal to 5km, the power line of the superior transformer substation must be configured and set with optical fiber current differential protection;
the protection setting requirements of the power supply side line of the superior transformer substation are as follows:
wherein I section of zero sequence current is stopped using, I section of protection of interphase distance, I section of grounding distance and II section of protection of interphase distance, II sections of grounding distance and II sections of zero sequence current have the setting requirements as follows:
(1) protection of phase distance I section and grounding distance I section
Setting according to the condition of avoiding the tail end fault of the line:
Zzd≤KKZL(3)
(3) in the formula KKTaking 0.7-0.8 as a reliable coefficient;
the time delay of the protection of the interphase distance I section and the grounding distance I section is 0 s;
when the power supply line is a short line less than or equal to 5km, the protection of the interphase distance I section and the grounding distance I section is stopped when the protection cannot be set, and the protection function is served by optical fiber current differential protection with a full-line quick-action function;
(2) protecting an interphase distance section II and a grounding distance section II:
setting the minimum measurement impedance of the protection when the medium-low voltage bus of the maximum transformer of the substation or the 110kV outgoing line is in short circuit:
Zzd≤KKZL+KKbZb(4)
(4) in the formula KK、KKbTaking the coefficient of reliability as 0.7-0.8, ZLIs line impedance, ZbIs impedance of transformer；
The time delay of the protection of the interphase distance II section and the grounding distance II section is 0.3 s;
(3) zero sequence current II section
Setting according to the fact that the line tail end fault has enough sensitivity:
(5) in the formula (II), the compound is shown in the specification,
is 110kV bus single-phase short-circuit current in the minimum operation mode of the system, KlmTaking 1.5 as a sensitivity coefficient;
the time delay of the zero sequence current II section protection is 0.3 s;
according to the requirements, the protection ranges of the phase distance I section protection and the grounding distance I section are 70% -80% of the line, the protection ranges of the phase distance II section protection, the grounding distance II section protection and the zero sequence current II section are all the line, the line extends into the high-voltage winding part of the lower-level line or the main transformer, and the time delay is 0.3 s.
The bus differential protection locking backup power automatic switching method comprises the following steps that the 110kV side-mounted equipment automatic switching of a 110kV substation or a 220kV substation is carried out, and the requirements of bus differential protection locking backup power automatic switching are as follows: i, a first-stage bus differential protection blocking No. 1 power supply incoming line circuit breaker 1DL and a sectional circuit breaker 3 DL; II sections of busbar differential protection shutting 2 # power incoming line circuit breakers 2DL and section circuit breakers 3 DL.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, by adopting the scheme that the substation eliminates the dead zone fault of the sectional (bus coupling) circuit breaker, the 110kV bus differential protection can accurately act and remove the fault when the dead zone fault of the sectional (bus coupling) circuit breaker occurs in various operation modes.
2. The invention adopts the scheme of 110kV bus differential protection locking spare power automatic switching of the substation, and the logic is simple and feasible.
3. The scheme of the invention is suitable for: (1) a 110kV single bus subsection primary main wiring of a 110kV substation; (2) a 110kV double-bus primary main wiring of a 220kV substation; (3)110kV single-bus subsection primary main wiring of a 220kV substation.
Drawings
FIG. 1 is a schematic diagram of elimination of bus tie dead zone faults;
FIG. 2 is a primary main wiring diagram of a single bus segment of a 110kV substation;
FIG. 3 is a 110kV double-bus (single-bus segment) primary main wiring diagram of a 220kV substation;
the symbols in fig. 1 are illustrated as follows:
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Fig. 1 shows a schematic diagram of eliminating bus tie dead zone fault according to the present invention.
As shown in fig. 2, the power transmission and distribution network applied by the method of the present invention is a single bus segment primary main wiring system network of a substation. The primary main wiring of the 110kV system of the transmission and distribution network comprises: the No. 1 power supply bus differential spacing device and the No. 2 power supply bus differential spacing device 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 for short in the following); the No. 1 power supply bus differential interval equipment and the No. 2 power supply bus differential interval equipment are provided with bus differential circuit breakers 1DL and 2DL, and are connected with CT1 and CT2 in series; in addition, 110kV I section bus and II section bus are connected with 110kV bus voltage mutual inductors, the 110kV I section bus is also connected with No. 1 transformer branch, No. 2 transformer branch, No. 1 110kV outgoing line branch, 110kV voltage mutual inductors (PT for short in the following) and 110kV bus lightning arresters; the 110kV II section bus is also connected with a No. 3 transformer branch, a No. 2 110kV outgoing line branch, 110kV PT2 and 110kV bus lightning arresters.
Aiming at the transformer station adopting single-bus sectionalized wiring or double-bus wiring, how to eliminate dead zone faults of a sectionalizing circuit breaker or a bus tie circuit breaker is solved to meet the field operation requirements.
An example of the process of the invention is given below (taking fig. 2 as an example):
1. the No. 1 power circuit breaker 1DL and the No. 2 power circuit breaker 2DL operate, the sectional circuit breaker 3DL is hot standby, and faults occur between the sectional circuit breaker and the sectional CT;
because power circuit breaker No. 1DL, power circuit breaker No. 2DL operate, section circuit breaker 3DL is hot standby, i.e., section circuit breaker 3DL trip position. When a fault occurs between the sectional circuit breaker 3DL and the sectional CT, the sectional CT is positioned on the side of a 110kV I-section bus and is equivalent to a 110kV I-section bus fault, the bus differential protection is used for judging that the sectional circuit breaker 3DL is at the opening position, and the sectional current does not participate in the differential current calculation of a 110kV I-section bus or a 110kV II-section bus small differential element, so that the 110kV I-section bus does not contain a small differential relay of the sectional current, the 110kV bus differential large differential relay is started, the locking condition of the 110kV I-section bus composite voltage is opened, the circuit breaker on the 110kV I-section bus is tripped by the bus differential protection action of the 110kV I-section bus and the sectional circuit breaker is locked and closed at the same time, and.
When the 110kV I section bus has a fault, the 110kV bus differential large differential relay is started, the 110kV I section bus composite voltage locking condition is opened, and the bus differential protection action locking subsection circuit breaker 3DL is switched on.
2. No. 1 power circuit breaker 1DL and sectional circuit breaker 3DL operate, No. 2 power circuit breaker 2DL is hot standby, and faults occur between the sectional circuit breaker 3DL and the sectional CT
Because No. 1 power circuit breaker 1DL, section circuit breaker 3DL operation, No. 2 power circuit breaker 2DL is hot standby, No. 2 power circuit breaker 2DL separating brake position promptly. When a fault occurs between the sectional breaker 3DL and the sectional CT, the sectional CT is positioned on the side of a 110kV I section bus, which is equivalent to a 110kV II section bus fault, and the protection of the superior No. 1 power line is started within the protection range of the superior power line from the second section, and the action can be performed after 0.3 s; meanwhile, a 110kV II-section bus comprises a small differential relay with sectional current, a 110kV bus differential large differential relay is started, the 110kV II-section bus composite voltage locking condition is opened, and a bus differential protection action jumps a circuit breaker on the 110kV II-section bus and a 110kV section circuit breaker; due to the bus differential protection action of the 110kV II-section bus, a closing loop of the spare power automatic switching No. 2 power circuit breaker is closed, and therefore the spare power automatic switching cannot start the 2DL closing of the No. 2 power circuit breaker.
After the 110kV section breaker is tripped, the 110kV section I bus fault is changed, the 110kV section I bus does not contain a small differential relay of section current, the 110kV bus differential large differential relay is started, the 110kV section I bus composite voltage blocking condition is opened, the bus differential protection action trips the 110kV section I bus breaker, and the fault is removed.
Or after the 110kV II-section bus differential protection is started, on one hand, a T time open signal is output, on the other hand, a segmented circuit breaker 3DL is started to trip, after the segmented circuit breaker 3DL is tripped, the segmented circuit breaker 3DL is changed from a switch-on position to a switch-off position, a 110kV II-section bus contains a small differential relay of segmented current, a 110kV II-section bus composite voltage locking element is changed from action to return, the 110kV II-section bus does not contain the small differential relay of the segmented current and can not act, a 110kV bus differential large differential relay is still started, a segmented phase current element acts or a zero sequence current element acts, after the conditions of the 110kV I-section bus composite locking condition are opened, after the time delay T1, the bus differential protection acts to trip the circuit breaker on the 110kV I-section.
3. No. 2 power circuit breaker 2DL and sectional circuit breaker 3DL operate, No. 1 power circuit breaker 1DL is hot standby, and faults occur between the sectional circuit breaker and the sectional CT
Because No. 2 power circuit breaker 2DL, section circuit breaker 3DL operation, No. 1 power circuit breaker 1DL is hot standby, No. 1 power circuit breaker 1DL separating brake position promptly. When a fault occurs between the sectional circuit breaker 3DL and the sectional CT, the sectional CT is positioned on the side of a 110kV I-section bus and is equivalent to a 110kV II-section bus fault, the 110kV II-section bus comprises a small differential relay of sectional current, a 110kV bus differential large differential relay is started, the 110kV II-section bus composite voltage locking condition is opened, and the bus differential protection action jumps a circuit breaker on the 110kV II-section bus and the 110kV sectional circuit breaker.
After the 110kV section breaker is tripped, the 110kV I section bus fault disappears, but the 110kV I section bus busbar differential protection cannot be operated, so that the closing of the spare power automatic switching No. 1 power supply breaker 1DL cannot be locked. The switch-on of a standby power automatic switching action starting No. 1 power circuit breaker 1DL is on a fault bus, and the distance between a superior No. 2 power circuit and a second section of protection is within the protection range of the distance between the superior power circuit and the second section, so that the circuit can only act after 0.3 s; meanwhile, when the 110kV I-section bus has a fault, the 110kV I-section bus does not contain a small differential relay of sectional current, the 110kV bus differential large differential relay is started, the 110kV I-section bus composite voltage locking condition is opened, the bus differential protection action jumps a circuit breaker on the I-section bus, and the fault is removed.
Or the spare power automatic switching operation starts the switch-on of the No. 1 power circuit breaker 1DL, when the switch-on is carried out on the I section bus of the fault, at the moment, the spare power automatic switching operation starts the switch-on of the No. 1 power circuit breaker 1DL, the 110kV I section bus composite voltage is locked and opened, the 110kV bus differential large differential relay operates again, the No. 1 power incoming line circuit breaker 1DL is changed from the switch-off position to the switch-on position, the No. 1 power incoming line phase current exceeds the setting value or the zero sequence current exceeds the setting value, and after the conditions are met, the bus differential protection operation trips the 110kV I section bus circuit breaker to remove the fault.
4. No. 1 power circuit breaker 1DL, No. 2 power circuit breaker 2DL and segmented circuit breaker 3DL operate, and faults occur between the segmented circuit breakers and the segmented CT
Because the power breaker No. 1DL, power breaker No. 2DL, and section breaker No. 3DL operate. When a fault occurs between the sectional circuit breaker 3DL and the sectional CT, the sectional CT is positioned on the side of a 110kV I-section bus and is equivalent to a 110kV II-section bus fault, the 110kV II-section bus comprises a small differential relay of sectional current, a 110kV bus differential large differential relay is started, the 110kV II-section bus composite voltage locking condition is opened, and the bus differential protection action jumps a circuit breaker on the 110kV II-section bus and the 110kV sectional circuit breaker.
After the 110kV section breaker is tripped, the fault of the 110kV I section bus is not eliminated. Because the protection range is within the protection range of the distance from the superior power line to the segment II, the protection of the distance from the superior No. 2 power line to the segment II is started, and the operation can be carried out after 0.3 s; meanwhile, when the 110kV I-section bus has a fault, because the 110kV I-section bus is already at the opening position, the 110kV I-section bus does not contain a small differential relay of sectional current, the 110kV bus differential large differential relay is started, the 110kV I-section bus composite voltage locking condition is opened, the bus differential protection action jumps the circuit breaker on the I-section bus, and the fault is removed.
Or after the 110kV II-section bus differential protection is started, on one hand, a T time open signal is output, on the other hand, a segmented circuit breaker 3DL is started to trip, after the segmented circuit breaker 3DL is tripped, the segmented circuit breaker 3DL is changed from a switch-on position to a switch-off position, a 110kV II-section bus contains a small differential relay of segmented current, a 110kV II-section bus composite voltage locking element is changed from action to return, the 110kV II-section bus does not contain the small differential relay of the segmented current and can not act, a 110kV bus differential large differential relay is still started, a segmented phase current element acts or a zero sequence current element acts, after the conditions of the 110kV I-section bus composite locking condition are opened, after the time delay T1, the bus differential protection acts to trip the circuit breaker on the 110kV I-section.
The technical scheme of the invention meets the following primary main wiring:
(1) a 110kV single bus subsection primary main wiring of a 110kV substation;
(2) a 110kV double-bus primary main wiring of a 220kV substation;
(3)110kV single-bus subsection primary main wiring of a 220kV substation. (as shown in FIG. 3)
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. A relay protection method for eliminating dead zone faults of a sectional breaker and a bus tie breaker is characterized by comprising the following steps:
1. the bus differential protection action control of the I-section bus breaker is as follows:
1.1 blocking Condition 1:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) a 110kV bus differential I section bus small differential relay containing sectional current acts;
(3) the 110kV bus differential large differential relay acts;
when the conditions are met, the bus differential protection action jumps the I section bus circuit breaker;
1.2 blocking Condition 2:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) a 110kV bus differential I section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the sectional breaker is at the opening position;
when the conditions are met, the bus differential protection action jumps the I section bus circuit breaker;
1.3 blocking Condition 3:
1.3.1 output T time open signal:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus difference II-section bus small differential relay with sectional current acts;
(3) the 110kV bus differential large differential relay acts;
when the conditions (1) to (3) are all met, outputting a T time open signal;
1.3.2 latch-up conditions:
(1) when any condition of the conditions (1) to (3) of the 1.3.1 is not met, namely a 110kV bus differential II section bus small differential relay or a 110kV bus differential large differential relay or a 110kV II section bus composite voltage element is changed from the original action to return;
(2) there is an output T time open signal;
(3) when the section breaker is changed from the switching-on position to the switching-off position;
(4) the 110kV bus differential II-section bus small differential relay without sectional current does not act;
(5) the 110kV I section bus composite voltage is locked and opened;
(6) the 110kV bus differential large differential relay acts;
(7) the phase current element of the segmented CT exceeds a setting value, or the zero-sequence current element exceeds the setting value;
when the conditions (1) to (7) are all met, after delay time t1, the bus differential protection action jumps to a first-section bus breaker;
1.4 blocking Condition 4:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) the spare power automatic switching starts a No. 1 power incoming line breaker 1DL to switch on;
(4) the No. 1 power incoming line breaker 1DL is changed from an opening position to a closing position;
(5) the phase current element of the inlet wire of the No. 1 power supply exceeds a setting value, or the zero-sequence current element exceeds the setting value;
when the conditions (1) - (5) are all met, the bus differential protection action jumps the I-section bus circuit breaker;
2. the control of the bus differential protection action tripping II-section bus circuit breaker is as follows:
2.1 blocking Condition 1:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus difference II-section bus small differential relay with sectional current acts;
(3) the 110kV bus differential large differential relay acts;
when the conditions are met, tripping the second-section bus circuit breaker by the bus differential protection action;
2.2 blocking Condition 2:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus differential II-section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the sectional breaker is at the opening position;
when the conditions are met, tripping the second-section bus circuit breaker by the bus differential protection action;
2.3 blocking Condition 3:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) the spare power automatic switching starts a No. 2 power incoming line breaker 2DL to switch on;
(4) the No. 2 power incoming line breaker 2DL is changed from an opening position to a closing position;
(5) the phase current element of the inlet wire of the No. 2 power supply exceeds a setting value, or the zero-sequence current element exceeds the setting value;
when the conditions (1) - (5) are all met, tripping the second-section bus circuit breaker by the bus differential protection action;
3. the control of the closing of the bus differential protection action locking section breaker is as follows:
3.1 blocking Condition 1:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) a 110kV bus differential I section bus small differential relay containing sectional current acts;
when the conditions are met, the bus differential protection action jumps the sectional breaker;
3.2 blocking Condition 2:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) a 110kV bus difference II-section bus small differential relay with sectional current acts;
when the conditions are met, the bus differential protection action jumps the sectional breaker;
3.3 blocking Condition 3:
(1) the 110kV bus differential large differential relay acts;
(2) the composite voltage of the 110kV I section bus is locked and unlocked or the composite voltage of the 110kV II section bus is locked and unlocked;
and when the conditions are met, the bus differential protection action jumps the sectional breaker.
2. The relay protection method for eliminating the dead zone fault of the sectionalized and buscouple circuit breaker as claimed in claim 1, wherein the T time in the output T time open signal is 200 and 300 milliseconds; the delay time t1 takes 20-40 milliseconds.
3. The relay protection method for eliminating the dead zone fault of the sectionalized and buscouple circuit breaker according to claim 1, wherein the setting and requirements of the related protection in the lockout conditions 1 and 2 are as follows:
in the locking conditions 1 and 2, the phase current element fixed value of the subsection or the inlet wire of the No. 1 power supply or the inlet wire of the No. 2 power supply is set according to the maximum short-circuit current which flows through the protection when the middle and low-voltage buses of the transformer substation on the local substation or the 110kV outlet line are short-circuited:
(1) in the formula (I), the compound is shown in the specification,
the maximum short-circuit current K of the protection flows when the middle and low-voltage buses of the maximum transformer of the substation or the substation on a 110kV outgoing line are short-circuited in the maximum operation mode of the systemkTaking 1.3-1.5 as a reliable coefficient;
the zero sequence current element fixed value of the section or No. 1 power supply inlet wire has sensitivity setting more than or equal to 1.5 times according to the minimum operation mode of the system for 110kV bus single-phase earth fault:
(2) in the formula (I), the compound is shown in the specification,
is 110kV bus single-phase short-circuit current in the minimum operation mode of the system, KlmTaking as a sensitivity coefficient1.5；
Phase current elements of a segmented or No. 1 power supply inlet wire or No. 2 power supply inlet wire adopt phase currents of an A phase, a B phase and a C phase;
the phase current element and the zero sequence current element of No. 1 power supply incoming line or No. 2 power supply incoming line are required to be provided with a direction element, and the direction element points to: pointing from the line to the bus bar.
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| CN111224385B (en) * | 2019-12-09 | 2021-03-02 | 国网江苏省电力有限公司镇江供电分公司 | Disconnection protection method for comparing voltage amplitude difference of two side wires of line and matching of spare power automatic switching |
| CN112467703B (en) * | 2020-11-16 | 2024-02-09 | 国网河南省电力公司焦作供电公司 | Bus-tie dead zone protection device suitable for 110 kilovolt network characteristics |
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