CN109980615B - Relay protection method for eliminating dead zone faults of sectional circuit breaker and bus-tie circuit breaker - Google Patents
Relay protection method for eliminating dead zone faults of sectional circuit breaker and bus-tie circuit breaker Download PDFInfo
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- CN109980615B CN109980615B CN201910261115.9A CN201910261115A CN109980615B CN 109980615 B CN109980615 B CN 109980615B CN 201910261115 A CN201910261115 A CN 201910261115A CN 109980615 B CN109980615 B CN 109980615B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised 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
- H02H7/262—Sectionalised 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 switching or blocking orders
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Abstract
The invention discloses a relay protection method for eliminating dead zone faults of a sectional breaker and a bus tie breaker, which can be applied to a power transmission and distribution network and is used for relay protection for eliminating the dead zone faults of the sectional breaker or the bus tie breaker by a single bus sectional wiring or a double bus wiring of a first-trip sectional breaker of a substation. According to the invention, by adopting the scheme of eliminating the dead zone fault of the sectionalized or bus-coupled circuit breaker by 110kV bus differential protection of the substation, when the dead zone fault of the sectionalized or bus-coupled circuit breaker occurs in various operation modes, the bus differential protection can correctly act to remove the bus of the fault section, so that the non-fault bus can still continue to operate, the safe and stable operation of a power grid is facilitated, and the power supply reliability of the power grid is improved. The invention has simple and easy logic. The scheme of the invention is suitable for the 110kV single-bus subsection primary main wiring of the 110kV substation; a 110kV double-bus primary main wiring of a 220kV substation; 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 section 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 method for eliminating dead zone faults of a sectionalized breaker and a bus tie 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 circuit breaker and a bus coupler circuit breaker, which can be applied to a power transmission and distribution network and is used for relay protection for eliminating dead zone faults of the sectional or bus coupler circuit breaker by a single bus sectional wiring or a double bus wiring of a first-trip sectional circuit breaker 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 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;
1.2 blocking Condition 2:
1.2.1 output T time open signal condition:
(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;
1.2.2 latch-up conditions:
(1) when any condition of the conditions (1) to (3) of the 1.2.1 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 3DL 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 segmented phase current element exceeds a setting value, or the zero sequence current element exceeds the setting value;
when the conditions are all met and the time is delayed for t1, the bus differential protection action jumps the I section bus circuit breaker;
the output open time T is 200-; the delay t1 takes 20-40 milliseconds.
1.3 blocking Condition 3:
(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 No. 1 power supply inlet wire 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 that the bus differential protection action jumps II sections of bus circuit breakers and locks No. 2 power circuit breakers to switch on simultaneously is as follows:
2.1 blocking Condition 1:
(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;
2.2 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) 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 No. 2 power supply inlet wire exceeds the setting value, or the zero sequence current element exceeds the setting value;
when the conditions 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 tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
3.2 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 tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
3.3 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) a 110kV bus difference II-section bus small differential relay with sectional current acts;
when the conditions are met, the bus differential protection action tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
3.4 blocking Condition 4:
(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, the bus differential protection action tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
3.5 blocking Condition 5:
(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 tripping sectional breaker locks the sectional breaker to be switched on at the same time.
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 circuit breaker and the bus-tie circuit breaker, the setting and requirements of related protection in the locking conditions 1 and 2 are as follows:
1. 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 mode of a 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;
2. 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. 3.1 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 circuit breaker and the bus tie circuit breaker, the requirements for configuration and setting of the line protection at the power side of the upper-level transformer substation are as follows:
1. 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;
2. 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 I section of interphase distance, I section of ground connection distance:
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 the transformer impedance;
the time delay of the protection of the interphase distance II section and the grounding distance II section is 0.3 s;
(3) and (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 of eliminating the dead zone fault of the sectionalized (bus coupling) circuit breaker by 110kV bus differential protection of the substation, when the dead zone fault of the sectionalized (bus coupling) circuit breaker occurs in various operation modes, the bus differential protection can correctly act to cut off the bus of the fault section, the non-fault bus can still continue to operate, the safe and stable operation of a power grid is facilitated, and the power supply reliability of the power grid is improved.
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 applicable to: (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 is a schematic diagram of a relay protection method for eliminating dead zone faults of a sectionalizing circuit breaker and a bus tie circuit breaker.
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.
As shown in fig. 3, the invention can also be applied to a 110kV double-bus primary main connection (or single-bus subsection) primary main connection of a 220kV substation.
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):
no. 1 power circuit breaker 1DL and 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. The bus differential protection has the advantages that the bus differential protection judges that the sectional current of the sectional breaker 3DL does not participate in the differential current calculation of a 110kV I-section bus or a 110kV II-section bus small differential element in the dislocation automatic mode, when a fault occurs between the sectional breaker 3DL and the sectional CT, the sectional CT is located on the 110kV I-section bus side and is equivalent to the fault of the 110kV I-section bus, 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, and the 110kV I-section bus differential protection acts to trip the I-section bus breaker to lock the sectional breaker and close.
When a 110kV I section bus has a fault, a 110kV bus differential large differential relay is started, the 110kV I section bus composite voltage locking condition is opened, and a bus differential protection action locking sectional circuit breaker 3DL is switched on.
The No. 2.1 power circuit breaker 1DL and the sectional circuit breaker 3DL operate, the No. 2 power circuit breaker 2DL is in hot standby, and a fault occurs 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 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 the fault of a 110kV II section bus, the 110kV II section bus comprises a small differential relay of sectional current, a 110kV bus differential large differential relay is started, the locking condition of the 110kV II section bus composite voltage is opened, and the bus differential protection action jumps to the 110kV section circuit breaker; because the 110kV bus difference is under the condition, a closing loop of the spare power automatic switching No. 2 power circuit breaker is not locked, the spare power automatic switching still can start the closing of the No. 2 power circuit breaker, so that the 110kV II section bus is subjected to spare power automatic switching to the No. 2 power incoming line for power supply, and the power supply of the 110kV II section bus is ensured.
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 trips, the segmented circuit breaker 3DL changes 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 changes from action to return, the 110kV II-section bus contains a small differential relay of segmented current and cannot act, a 110kV II-section bus differential large differential relay still starts, 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 opening are met, after time delay T1, the bus differential protection action trips to a circuit breaker on the 110kV I-section bus, and meanwhile, the standby power supply circuit breaker 1 is locked.
The No. 3.2 power circuit breaker 2DL and the sectional circuit breaker 3DL operate, the 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, which is equivalent to the fault of a 110kV II-section bus, the 110kV II-section bus comprises a small differential relay of sectional current, a 110kV bus differential large differential relay is started, the locking condition of the 110kV II-section bus composite voltage is opened, the 110kV section circuit breaker is tripped by bus differential protection action, and the continuous power supply of the 110kV II-section bus is ensured.
After the 110kV section breaker is tripped, the 110kV I section bus fault disappears, but a small differential relay and a large differential relay which do not contain section current and correspond to the 110kV I section bus busbar differential protection do not act, so that the closing of the spare power automatic switching No. 1 power supply breaker 1D 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 action starts the switch-on of the No. 1 power circuit breaker 1DL, when the switch-on is carried out on the I section of the bus with the fault, at the moment, the spare power automatic switching action, the 110kV I section bus composite voltage locking and opening, the 110kV bus differential large differential relay acts again, the No. 1 power incoming line circuit breaker 1DL changes 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 that the conditions are met, the bus differential protection action trips the 110kV I section bus circuit breaker to remove the fault.
4.1 power circuit breaker 1DL, 2 power circuit breaker 2DL, section circuit breaker 3DL operation, the fault takes place between section circuit breaker and the section 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, which is equivalent to the fault of a 110kV II-section bus, the 110kV II-section bus comprises a small differential relay of sectional current, a 110kV bus differential large differential relay is started, the locking condition of the 110kV II-section bus composite voltage is opened, the 110kV section circuit breaker is tripped by bus differential protection action, and the continuous power supply of the 110kV II-section bus is ensured.
After the 110kV section breaker is tripped, the fault of the 110kV I section bus is not eliminated. After the 110kV segmented circuit breaker is tripped, the circuit breaker is already at a tripping position, and because the circuit breaker is within the protection range of the distance from the superior power line to the segment II, the superior power line No. 2 is protected and started at the segment II, and the circuit breaker can act after 0.3 s; at the moment, 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 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 can be applied to 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 connection of a 220kV substation (as shown in figure 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 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;
1.2 blocking Condition 2:
1.2.1 output T time open signal condition:
(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;
1.2.2 latch-up conditions:
(1) when any condition of the conditions (1) to (3) of the 1.2.1 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 3DL 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 segmented phase current element exceeds a setting value, or the zero sequence current element exceeds the setting value;
when the conditions are all met and the time is delayed for t1, the bus differential protection action jumps the I section bus circuit breaker;
1.3 blocking Condition 3:
(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 No. 1 power supply inlet wire 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 that the bus differential protection action jumps II sections of bus circuit breakers and locks No. 2 power circuit breakers to switch on simultaneously is as follows:
2.1 blocking Condition 1:
(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;
2.2 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) 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 No. 2 power supply inlet wire exceeds the setting value, or the zero sequence current element exceeds the setting value;
when the conditions 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 tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
3.2 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 tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
3.3 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) a 110kV bus difference II-section bus small differential relay with sectional current acts;
when the conditions are met, the bus differential protection action tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
3.4 blocking Condition 4:
(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, the bus differential protection action tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
3.5 blocking Condition 5:
(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 tripping sectional breaker locks the sectional breaker to be switched on at the same time.
2. The relay protection method for eliminating the dead zone fault of the sectionalizing breaker and the bus tie 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 sectionalizing circuit breaker and the bus tie circuit breaker as claimed in claim 1, wherein the setting and requirements of the related protection in the blocking conditions 1 and 2 are as follows:
1. 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 mode of a 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;
2. 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. 3.1 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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| 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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