CN112491014A - Double-bus double-section and bus differential protection transformation method capable of reducing power failure time - Google Patents
Double-bus double-section and bus differential protection transformation method capable of reducing power failure time Download PDFInfo
- Publication number
- CN112491014A CN112491014A CN202011548391.2A CN202011548391A CN112491014A CN 112491014 A CN112491014 A CN 112491014A CN 202011548391 A CN202011548391 A CN 202011548391A CN 112491014 A CN112491014 A CN 112491014A
- Authority
- CN
- China
- Prior art keywords
- bus
- interval
- intervals
- differential protection
- double
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
-
- 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
Abstract
The invention discloses a double-bus double-section and busbar differential protection transformation method capable of reducing power failure time, which is characterized in that a 220kV bus is transformed into a double-bus double-section and double-bus single-section wiring mode from a double-bus single-section wiring mode, so that the power failure range can be limited to one fourth of a total station when any section of bus fails, the power failure range is limited to the minimum, and the busbar differential protection of the 220kV bus is disconnected from the original two sets of double-bus single-section busbar differential protection one by one to a new busbar differential protection suitable for double-bus double-section by adopting a wheel-stop mode while the busbar differential protection is replaced, so that the transition of new and old busbar differential protection is completed, compared with the traditional mode that buses are transformed and upgraded in a whole power failure mode or according to section division, the power failure range and the power failure time are greatly reduced, the transformation period of a transformer substation is shortened, and the safe and stable operation of a power grid is effectively guaranteed, the safety and the reliability of the power grid are improved.
Description
Technical Field
The invention belongs to the technical field of bus differential transformation in intelligent transformation of a transformer substation, and particularly relates to a double-bus double-subsection bus differential transformation method capable of reducing the power failure time of the transformer substation.
Background
According to the relevant regulations, when the number of the 220kV incoming and outgoing lines is 10-14, a double-bus single-section wiring form is adopted, and when the number of the incoming and outgoing lines is 15 or more, a double-bus double-section wiring form is adopted. At present, a plurality of built and operated 500kV transformer substations are limited by the limitation of 220kV incoming and outgoing circuit number in the early stage, and a double-bus single-section wiring mode is mostly adopted; when the transformer substation is expanded according to the requirements of load increase and power grid construction development in the later stage, due to the increase of the number of incoming and outgoing lines of 220kV, the existing double-bus single-section wiring form must be modified into a double-bus double-section wiring form, and according to the technical specification requirement of relay protection configuration, the 220kV bus is required to be configured with two sets of bus differential protection and failure protection according to a doubling principle, so that when double-bus double-section modification is carried out, the differential protection device of the bus must be correspondingly upgraded and modified, and the original two sets of bus differential protection devices are upgraded into four sets of bus differential protection devices. However, in the transformation process, the 220kV bus cannot be completely powered off or stopped by sections due to reasons such as power grid and load, and in order to ensure safe and reliable power supply of the transformer substation, it is necessary to find a new minimum power failure construction method to realize smooth transformation of double-bus double-section and bus differential protection.
Disclosure of Invention
The purpose of the invention is: the double-bus double-section and bus differential protection transformation method capable of reducing the power failure time is provided, the power failure construction range can be reduced as much as possible in the process of upgrading and transforming the bus differential protection device, and the safety and stability of a power grid are guaranteed.
The technical scheme of the invention is as follows: a double-bus double-section and bus differential protection transformation method capable of reducing power failure time is characterized in that an original double bus is set as an I # bus and an II # bus, wherein the I # bus is divided into a 1M bus and a 2M bus, I # breaker section intervals are arranged between the I # bus and the 2M bus, and a bus-coupling first interval and a bus-coupling second interval are respectively arranged between the II # bus and the 1M bus and between the II # bus and the 2M bus, and the specific transformation method comprises the following steps:
the first stage, installing and transforming four sets of new busbar differential protection screens and sectional protection cabinets according to construction drawings, completing monomer debugging and acceptance inspection, laying cables required by line intervals for transformation, arranging the cables in place, and connecting the new busbar differential protection screens;
the second stage is that the II bus works normally, the 1M bus and the 2M bus are all turned to overhaul after power failure, the sectional interval of the I breaker is disconnected, then the main transformer interval, the outgoing line interval, the bus equipment, the isolation disconnecting link of the first bus-to-bus and the second bus-to-bus interval, the isolation disconnecting link connected with the 1M bus and the 2M bus, and the isolation disconnecting link are disconnected and grounded, all line intervals are connected to the II bus, the CT of the sectional interval of the I breaker is replaced, new line intervals are installed on the 1M bus and the 2M bus, the related loops of each line interval are respectively connected into the corresponding new bus differential protection screens, and power transmission of the 1M bus and the 2M bus is recovered after completion;
and a third stage: the main transformer intervals, the outgoing line intervals, the bus equipment and the bus-coupled first and second intervals are connected to the corresponding 1M bus and 2M bus by controlling the corresponding isolation disconnecting links, then the II # bus is powered off and cut off into a 3M bus and a 4M bus, after the II # bus is segmented, a first bus-tie interval is connected between the 1M bus and the 3M bus, a second bus-tie interval is connected between the 2M bus and the 4M bus, and a II # breaker subsection interval and a CT are arranged between the 3M bus and the 4M bus, installing new line intervals and PT on the 3M bus or the 4M bus, finishing the transformation of PT secondary circuits of the line intervals on the 3M bus and the 4M bus, respectively accessing the CT, the PT and related circuits of the line intervals into corresponding new bus differential protection screens, and then restoring power transmission of the 3M bus and the 4M bus and communicating the sectional intervals of the II # circuit breaker;
a fourth stage:
a. the first bus coupler is communicated with the 1M bus and the 3M bus in normal operation at intervals, and the second bus coupler between the 2M bus and the 4M bus is separated to stop operation;
b. the lines connected on the 1M bus and the 3M bus run normally at intervals, and the main transformer intervals and the outgoing line intervals connected on the 2M bus and the 4M bus are disconnected with the 2M bus by controlling corresponding isolation disconnecting switches and run on the 4M bus, and at the moment, the 2M bus does not carry load;
c. the main transformer intervals, the outgoing line intervals and the bus-coupled intervals running on the 4M bus are powered off in turn, corresponding circuits are respectively connected into corresponding new bus differential protection screens, and after the corresponding circuits of the circuit intervals are connected into the new bus differential protection screens, the corresponding isolation disconnecting switches are controlled to disconnect the circuit intervals from the 4M bus and connect the circuit intervals to the 2M bus for normal operation;
d. the I # circuit breaker subsection interval and the II # circuit breaker subsection interval are respectively subjected to power failure to be turned to overhaul, corresponding loops are connected into a corresponding new bus differential protection screen between the 2M bus and the 4M bus, and a bus-coupled two-interval switch-on is put into normal operation to communicate the 2M bus and the 4M bus, so that all line intervals between the 2M bus and the 4M bus are completely transformed and put into normal operation;
the fifth stage:
a. switching all main transformer intervals and outgoing line intervals which are originally connected to the 1M bus and the 3M bus to the 1M bus, and disconnecting a bus-tie interval to quit operation;
b. the main transformer intervals, the outgoing line intervals and the bus-to-bus intervals which are connected on the 1M bus are powered off in turn, corresponding loops are respectively connected to the new bus differential protection screen, and after the corresponding loops of the line intervals are connected to the new bus differential protection screen, the connection with the 1M bus is disconnected by controlling corresponding isolation disconnecting switches, and the 1M bus is connected to the 3M bus;
c. the I # circuit breaker subsection interval and the II # circuit breaker subsection interval are respectively connected into a corresponding new bus differential protection screen between the 1M bus and the 3M bus, and at this time, all line intervals on the 1M bus and the 3M bus are transformed and put into normal operation;
the sixth stage: and (4) removing the old bus differential protection screen, and putting the I # circuit breaker section interval and the II # circuit breaker section interval into normal operation.
Before the sectional interval of the I # circuit breaker and the sectional interval of the II # circuit breaker in the sixth stage are put into normal operation, the bus differential protection screens can be stopped in a wheel-to-wheel mode according to requirements, and a transmission test of sectional failure is carried out.
And the operating power supply of the I # breaker and the isolation disconnecting link thereof in the I # breaker subsection interval is disconnected at the same time when the second-stage I # breaker subsection interval is disconnected.
When the circuit breaker II # in the step a of the fourth stage is communicated at the sectional interval, the circuit breaker II # and the operation power supply of the isolation disconnecting link of the circuit breaker II # in the sectional interval of the circuit breaker II # need to be disconnected, and the circuit breaker II # is manually switched on at the sectional interval, so that the effect of the sectional interval dead connection of the circuit breaker II # is achieved.
The line interval comprises at least two main transformer intervals and a plurality of outgoing line intervals, at the third stage, when the II # bus is disconnected into a 3M bus and a 4M bus, at least one main transformer interval is respectively connected between the 1M bus and the 3M bus and between the 2M bus and the 4M bus, and when the main transformer interval is powered off and connected into a new bus differential protection screen, a current loop, a disconnecting link secondary loop, a tripping loop and a failure loop of the main transformer interval are all connected into the new bus differential protection screen.
And a #2 main transformer interval is connected between the 2M bus and the 4M bus, in the fourth stage, the work of power failure of the #2 main transformer interval and access to a new bus differential protection screen is completed firstly, the work of transformation of a main transformer link jump circuit of the #2 main transformer interval is completed simultaneously, and then the work of alternate power failure of other outgoing line intervals and bus link two intervals and access to the new bus differential protection screen is performed.
Two main transformer intervals of #1 and #3 are connected between the 2M bus and the 4M bus, in the fifth stage, the work of accessing the corresponding new bus differential protection screen by the power failure of the main transformer interval of #1 is firstly carried out, the main transformer united jump loop transformation of the main transformer interval of #1 is simultaneously completed, after the access is completed, the work of accessing the corresponding new bus differential protection screen by the power failure of other outgoing line intervals, the main transformer interval of #3 and the bus coupling-interval is carried out, and the main transformer united jump loop transformation work of the main transformer interval of #3 is simultaneously completed.
The invention has the beneficial effects that: when the transformation method is adopted to transform double bus double sections of the transformer substation, the bus differential protection is upgraded into four sets of new bus differential protection structures suitable for double bus double sections, the power failure range can be limited to one fourth of the total station when any section of bus fails, so that the power failure range is limited to the minimum, and when bus differential protection is replaced, all lines are disconnected from the old bus differential protection one by one in a wheel-stop mode at intervals to complete the transition of the new bus differential protection.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a double-bus single-section wiring mode of a transformer substation before transformation;
FIG. 2 is a schematic structural diagram of a double-bus double-subsection wiring mode of a transformed substation;
in the drawings: 101. 1M bus; 102. a 2M bus; 103. i # breaker section interval; 200. II # bus; 201. a 3M bus; 202. a 4M bus; 203. II # circuit breaker section interval; 301. a bus tie interval; 302. a female connection interval; 401 and 404, bus equipment; 501. #2 Main Transformer Interval; 502. #1 Main Transformer Interval; 503. #3 Main Transformer Interval; 601 + 609, line spacing.
Detailed Description
The invention discloses a double-bus double-section and bus differential protection transformation method capable of reducing power failure time, which is specifically explained below by combining equipment transformation work of a certain transformer substation.
Taking a certain 500kV substation in a dwelling horse shop as an example, before transformation, the 220kV bus of the substation adopts a double-bus single-section connection mode, as shown in fig. 1, the substation is provided with two 220kV buses, which are respectively an I # bus and a II # bus, wherein the I # bus is divided into a 1M bus 101 and a 2M bus 102, an I # breaker section interval 103 is arranged between the 1M bus 101 and the 2M102 bus, the II # bus 200 is not divided, two sets of bus differential protection are arranged between the I # bus and the II # bus, in practical application, a set of GMH 150-4220S-type bus differential protection device for relay electricity is adopted between the 1M bus and the II # bus, and a set of BP-2B-type bus protection device for tenninhei relay protection is adopted between the 2M bus and the II # bus; a bus device 401 is connected to the II # bus, a bus device 403 is connected to the 1M bus 101, and a bus device 402 is connected to the 2M bus 102; a bus-tie first interval 301, a #1 main interval 502 and a #3 main interval 503 are connected between the 1M bus 101 and the II # bus 200, a bus-tie second interval 302 and a #2 main interval 501 are connected between the 2M bus 102 and the II # bus 200, and a plurality of outgoing line intervals 601 and 609 for outputting outwards are connected between the II # bus 200 and the 1M bus 101 and the 2M bus 102. The 500kV transformer substation carries out double-bus and double-section transformation on 220kV buses, namely, an original II # bus 200 is divided into a 3M bus 201 and a 4M bus 202, a II # breaker section interval 203 is arranged between the 3M bus and the 4M bus, after the II # bus 200 is segmented, the bus-tie-interval 301 and the plurality of outlet intervals 606-609 are connected between the 1M bus and the 3M bus, the bus device 401 connected on the original II # bus is moved to a position between the 2M bus and the 4M bus, bus equipment 404 is added on the 3M bus, the bus-coupled two intervals 302 and a plurality of outlet intervals 601 and 605 are connected between the 2M bus and the 4M bus, in the specific application, the number of the outgoing line intervals between the 1M bus and the 3M bus and between the 2M bus and the 4M bus is configured according to specific needs, and this embodiment is not limited in specific number. When the II # bus is transformed in a segmented mode, according to the technical specification requirement of relay protection configuration, the 220kV bus is required to be configured with two sets of bus differential protection and failure protection according to a dualization principle, the original two sets of bus single-segment bus differential protection are required to be upgraded into four sets of bus differential protection suitable for double-bus double-segment, namely two sets of bus differential protection devices are installed between a 1M bus and a 3M bus after transformation, and two sets of bus differential protection devices are installed between a 2M bus and a 4M bus.
The specific modification comprises the following steps:
the first stage is that four sets of new busbar differential protection screens and sectional protection cabinets required by the reconstruction are installed according to the construction drawing, monomer debugging and acceptance inspection are completed, laying and arrangement of all cable lines used by the reconstruction are completed in place, and inter-screen wiring is completed;
the second stage is that the II bus normally works, the 1M bus and the 2M bus are all turned to maintenance when power failure occurs, the I # breaker is controlled to be disconnected at a subsection interval through corresponding isolation disconnecting switches, meanwhile, an operation power supply of the isolation disconnecting switches in the I # breaker subsection interval is disconnected, then all main transformer intervals, outgoing line intervals, bus equipment and isolation disconnecting switches of the first bus-to-bus and the second bus-to-bus intervals connected to the 1M bus and the 2M bus are disconnected and grounded, the whole load of the transformer substation is brought by the II # bus, the CT of the I # breaker subsection interval is replaced, new line intervals are installed on the 1M bus and the 2M bus, the CT and related circuits of each line interval are respectively connected into corresponding new bus differential protection screens, and power transmission recovery of the 1M bus and the 2M bus is completed;
and a third stage: connecting each main transformer interval, outgoing line interval, bus equipment and a bus-coupling first and a bus-coupling second interval to corresponding 1M bus and 2M bus by controlling corresponding isolation disconnecting switches, then cutting off and disconnecting a II bus into a 3M bus and a 4M bus, after the segmentation of the II bus is finished, connecting the bus-coupling first interval between the 1M bus and the 3M bus, connecting the bus-coupling second interval between the 2M bus and the 4M bus, installing a II breaker segmentation interval and a CT between the 3M bus and the 4M bus, installing new line intervals and PT on the 3M bus and the 4M bus, transforming PT secondary circuits of each main transformer interval and outgoing line interval, respectively connecting the CT, PT and related circuits of each line interval into corresponding new bus differential protection screens, recovering power transmission of the 3M bus and the 4M bus and connecting the II breaker segmentation interval, in order to ensure construction safety, after the sectional interval of the II # circuit breaker is switched on, the sectional interval of the II # circuit breaker and an operation power supply of an isolating switch of the II # circuit breaker are disconnected, so that the sectional interval of the II # circuit breaker is kept in a dead connection state;
a fourth stage:
a. the first bus coupler is communicated with the 1M bus and the 3M bus in normal operation at intervals, and the second bus coupler between the 2M bus and the 4M bus is separated to stop operation;
b. the lines connected on the 1M bus and the 3M bus run normally at intervals, the lines connected on the 2M bus and the 4M bus run on the 4M bus by controlling the corresponding isolation disconnecting link to disconnect the 2M bus, and the 2M bus does not have load;
c. the method comprises the following steps that a #2 main transformer interval is powered off, a current loop, a disconnecting link secondary loop, a tripping loop and a failure loop of the #2 main transformer interval are connected into corresponding new bus differential protection screens, after the connection is finished, the #2 main transformer interval is disconnected from a 4M bus by controlling an isolation disconnecting link of the #2 main transformer interval and operates on the 2M bus, and meanwhile, the transformation of a main transformer joint tripping loop of the #2 main transformer interval is completed;
d. then, the work that each outgoing line interval and the bus-coupled interval between the 2M bus and the 4M bus are powered off in turn and the corresponding loop is connected into the corresponding new bus differential protection screen is completed in sequence, and after the corresponding loop of each line interval is connected into the new bus differential protection screen, the connection between each line interval and the 4M bus is disconnected by controlling the corresponding isolation disconnecting switch so as to be connected onto the 2M bus to normally operate;
e. the method comprises the steps that power failure is carried out on a sectional interval of an I # breaker and a sectional interval of an II # breaker, maintenance is carried out, a corresponding loop is connected into a corresponding new bus differential protection screen between a 2M bus and a 4M bus, a bus-coupled two-interval switch-in is put into normal operation to communicate the 2M bus and the 4M bus, and at this time, all line intervals between the 2M bus and the 4M bus are transformed and put into normal operation after the transformation is finished;
the fifth stage:
a. switching all main transformer intervals and outgoing line intervals which are originally connected to the 1M bus and the 3M bus to the 1M bus, and disconnecting a bus-tie interval to quit operation;
b. the method comprises the following steps that a #1 main transformer interval is powered off, a current loop, a disconnecting link secondary loop, a tripping loop and a failure loop of the #1 main transformer interval are connected into corresponding new bus differential protection screens, after the connection is finished, the #1 main transformer interval is disconnected from a 1M bus by controlling an isolation disconnecting link of the #1 main transformer interval and operates on a 3M bus, and meanwhile, the transformation of a main transformer joint tripping loop of the #1 main transformer interval is completed;
c. the outgoing line intervals, the #3 main transformer intervals and the bus-to-bus intervals connected to the 1M bus are powered off in turn, corresponding circuits are respectively connected to corresponding new bus differential protection screens, the main transformer combined tripping circuit transformation of the #3 main transformer intervals is completed simultaneously, and after the outgoing line intervals and the #3 main transformer intervals are connected to the 1M bus by controlling corresponding isolation disconnecting switches and connecting the outgoing line intervals and the #3 main transformer intervals to the 3M bus;
d. the I # circuit breaker subsection interval and the II # circuit breaker subsection interval are alternately connected into corresponding new bus differential protection screens between the 1M bus and the 3M bus, and at this time, all line intervals on the 1M bus and the 3M bus are transformed and put into normal operation;
the sixth stage: and (3) removing the old bus differential protection screen, applying for the alternate stop of the 220kV bus differential protection device according to the requirement of an operation and maintenance unit, carrying out a transmission test with sectional failure, and putting the sectional interval of the I # circuit breaker and the sectional interval of the II # circuit breaker into normal operation after the test is finished.
When the transformation method is adopted to transform double bus double sections of the transformer substation, the bus differential protection is upgraded into four sets of new bus differential protection structures suitable for double bus double sections, the power failure range can be limited to one fourth of the total station when any section of bus fails, so that the power failure range is limited to the minimum, and when bus differential protection is replaced, all lines are disconnected from the old bus differential protection one by one in a wheel-stop mode at intervals to complete the transition of the new bus differential protection.
Claims (7)
1. The utility model provides a can reduce two female double segmentation and bus differential protection transformation methods of power off time, sets up former double bus into I # generating line and II # generating line, wherein I # generating line segmentation is 1M generating line and 2M generating line, is equipped with I # circuit breaker segmentation interval between them, and sets up a bus tie interval and a bus tie interval between II # generating line and 1M generating line and 2M generating line respectively, its characterized in that, concrete transformation includes following step:
the first stage, installing and transforming four sets of new busbar differential protection screens and sectional protection cabinets according to construction drawings, completing monomer debugging and acceptance inspection, laying cables required by line intervals for transformation, arranging the cables in place, and connecting the new busbar differential protection screens;
the second stage is that the II bus works normally, the 1M bus and the 2M bus are all turned to overhaul after power failure, the sectional interval of the I circuit breaker is disconnected, then the main transformer interval, the outgoing line interval, the bus equipment, the isolation disconnecting link of the first bus-to-bus and the second bus-to-bus interval, the isolation disconnecting link connected with the 1M bus and the 2M bus, and the isolation disconnecting link are disconnected and grounded, all line intervals are connected to the II bus, the CT of the sectional interval of the I circuit breaker is replaced, new line intervals are installed on the 1M bus and the 2M bus, the related loops of each line interval are respectively connected into the corresponding new bus differential protection screens, and power transmission of the 1M bus and the 2M bus is recovered after;
and a third stage: the main transformer intervals, the outgoing line intervals, the bus equipment and the bus-coupled first and second intervals are connected to the corresponding 1M bus and 2M bus by controlling the corresponding isolation disconnecting links, then the II # bus is powered off and cut off into a 3M bus and a 4M bus, after the II # bus is segmented, a first bus-tie interval is connected between the 1M bus and the 3M bus, a second bus-tie interval is connected between the 2M bus and the 4M bus, and a II # breaker subsection interval and a CT are arranged between the 3M bus and the 4M bus, installing new line intervals and PT on the 3M bus or the 4M bus, finishing the transformation of PT secondary circuits of the line intervals on the 3M bus and the 4M bus, respectively accessing the CT, the PT and related circuits of the line intervals into corresponding new bus differential protection screens, and then restoring power transmission of the 3M bus and the 4M bus and communicating the sectional intervals of the II # circuit breaker;
a fourth stage:
a. the first bus coupler is communicated with the 1M bus and the 3M bus in normal operation at intervals, and the second bus coupler between the 2M bus and the 4M bus is separated to stop operation;
b. the lines connected on the 1M bus and the 3M bus run normally at intervals, and the main transformer intervals and the outgoing line intervals connected on the 2M bus and the 4M bus are disconnected with the 2M bus by controlling corresponding isolation disconnecting switches and run on the 4M bus, and at the moment, the 2M bus does not carry load;
c. the main transformer intervals, the outgoing line intervals and the bus-coupled intervals running on the 4M bus are powered off in turn, corresponding circuits are respectively connected into corresponding new bus differential protection screens, and after the corresponding circuits of the circuit intervals are connected into the new bus differential protection screens, the corresponding isolation disconnecting switches are controlled to disconnect the circuit intervals from the 4M bus and connect the circuit intervals to the 2M bus for normal operation;
d. the I # circuit breaker subsection interval and the II # circuit breaker subsection interval are respectively subjected to power failure to be turned to overhaul, corresponding loops are connected into a corresponding new bus differential protection screen between the 2M bus and the 4M bus, and a bus-coupled two-interval switch-on is put into normal operation to communicate the 2M bus and the 4M bus, so that all line intervals between the 2M bus and the 4M bus are completely transformed and put into normal operation;
the fifth stage:
a. switching all main transformer intervals and outgoing line intervals which are originally connected to the 1M bus and the 3M bus to the 1M bus, and disconnecting a bus-tie interval to quit operation;
b. the main transformer intervals, the outgoing line intervals and the bus-to-bus intervals which are connected on the 1M bus are powered off in turn, corresponding loops are respectively connected to the new bus differential protection screen, and after the corresponding loops of the line intervals are connected to the new bus differential protection screen, the connection with the 1M bus is disconnected by controlling corresponding isolation disconnecting switches, and the 1M bus is connected to the 3M bus;
c. the I # circuit breaker subsection interval and the II # circuit breaker subsection interval are respectively connected into a corresponding new bus differential protection screen between the 1M bus and the 3M bus, and at this time, all line intervals on the 1M bus and the 3M bus are transformed and put into normal operation;
the sixth stage: and (4) removing the old bus differential protection screen, and putting the I # circuit breaker section interval and the II # circuit breaker section interval into normal operation.
2. The double-bus double-section and bus differential protection transformation method capable of reducing power outage time as claimed in claim 1, wherein before the sixth stage I # breaker section interval and the II # breaker section interval are put into normal operation, transmission tests of section failure can be conducted according to the fact that each bus differential protection screen is required to stop.
3. The double-bus double-section and bus differential protection transformation method capable of reducing power outage time as claimed in claim 1, wherein operation power supplies of an I # breaker and an isolation disconnecting link of the I # breaker in an I # breaker section interval should be disconnected while the second stage I # breaker section interval is disconnected.
4. The double-bus double-section and bus differential protection transformation method capable of reducing power failure time as claimed in claim 1, wherein when the circuit breaker section II in the step a of the fourth stage is connected at intervals, the circuit breaker II and the isolation disconnecting link thereof in the circuit breaker section II need to be disconnected from the operating power supply, and the circuit breaker section II is manually switched on at intervals, so as to achieve the effect of dead connection of the circuit breaker II at intervals.
5. The double-busbar double-section and busbar differential protection reconstruction method capable of reducing power outage time as claimed in claim 1, wherein the line interval comprises at least two main transformer intervals and a plurality of outgoing line intervals, at least one main transformer interval is respectively connected between the 1M bus and the 3M bus and between the 2M bus and the 4M bus when the II # bus is disconnected into the 3M bus and the 4M bus in the third stage, and when the main transformer intervals are powered off and connected into a new busbar differential protection screen, a current loop, a disconnecting link secondary loop, a tripping loop and a failure loop of the main transformer intervals are all connected into the new busbar differential protection screen.
6. The double-busbar double-section and busbar differential protection reconstruction method capable of reducing power outage time according to claim 5, wherein a #2 main transformer interval is connected between the 2M bus and the 4M bus, and in the fourth stage, power outage of the #2 main transformer interval and work of accessing to a new busbar differential protection screen are completed firstly, meanwhile, main transformer combined tripping circuit reconstruction work of the #2 main transformer interval is completed, and then work of accessing to the new busbar differential protection screen is performed by alternate power outage of other outgoing line intervals and busbar differential intervals.
7. The double-bus double-section and bus differential protection reconstruction method capable of reducing the power outage time as claimed in claim 5, wherein two main transformer intervals #1 and #3 are connected between the 2M bus and the 4M bus, in the fifth stage, the work of accessing the corresponding new bus differential protection screen to the #1 main transformer interval in the power outage is firstly performed, meanwhile, the reconstruction of the main transformer joint tripping circuit of the #1 main transformer interval is completed, and after the access is completed, the work of accessing the corresponding new bus differential protection screen to the other outgoing line intervals and the #3 main transformer interval and the bus differential protection screen to the power outage is performed, and meanwhile, the reconstruction work of the main transformer joint tripping circuit of the #3 main transformer interval is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011548391.2A CN112491014B (en) | 2020-12-24 | 2020-12-24 | Double-bus double-section and bus differential protection transformation method capable of reducing power failure time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011548391.2A CN112491014B (en) | 2020-12-24 | 2020-12-24 | Double-bus double-section and bus differential protection transformation method capable of reducing power failure time |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112491014A true CN112491014A (en) | 2021-03-12 |
| CN112491014B CN112491014B (en) | 2022-08-09 |
Family
ID=74914384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011548391.2A Active CN112491014B (en) | 2020-12-24 | 2020-12-24 | Double-bus double-section and bus differential protection transformation method capable of reducing power failure time |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112491014B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007244138A (en) * | 2006-03-10 | 2007-09-20 | Chugoku Electric Power Co Inc:The | Protective circuit |
| JP2015216783A (en) * | 2014-05-12 | 2015-12-03 | 三菱電機株式会社 | Bus bar protective relay device |
| CN107154614A (en) * | 2017-07-13 | 2017-09-12 | 积成软件有限公司 | A kind of processing method of double female single segmentation mother CT broken strings based on topological constraints |
| CN109861180A (en) * | 2019-04-02 | 2019-06-07 | 国网江苏省电力有限公司镇江供电分公司 | Anti- section switch dead-zone fault bus differential protection is latched prepared auto restart guard method |
-
2020
- 2020-12-24 CN CN202011548391.2A patent/CN112491014B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007244138A (en) * | 2006-03-10 | 2007-09-20 | Chugoku Electric Power Co Inc:The | Protective circuit |
| JP2015216783A (en) * | 2014-05-12 | 2015-12-03 | 三菱電機株式会社 | Bus bar protective relay device |
| CN107154614A (en) * | 2017-07-13 | 2017-09-12 | 积成软件有限公司 | A kind of processing method of double female single segmentation mother CT broken strings based on topological constraints |
| CN109861180A (en) * | 2019-04-02 | 2019-06-07 | 国网江苏省电力有限公司镇江供电分公司 | Anti- section switch dead-zone fault bus differential protection is latched prepared auto restart guard method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112491014B (en) | 2022-08-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2017166735A1 (en) | Power-grid self-healing system and self-healing logic thereof in 110kv chain power-supply mode | |
| CN106374380B9 (en) | Uninterrupted power extension function module and extension method for GIS bus standby interval | |
| WO2014201989A1 (en) | Distributed intelligence feeder line automated control method | |
| CN101741137B (en) | Network centralized emergency power supply automatic switching method | |
| CN204928156U (en) | Distribution network bridge joint line structure | |
| CN106532683A (en) | Self-healing method of 110kV transformer station hand-in-hand power supply | |
| CN112350309A (en) | Self-healing power supply system for urban rail transit | |
| CN112310874B (en) | 220V double-charging four-feed direct current system uninterrupted safe replacement method | |
| CN112491014B (en) | Double-bus double-section and bus differential protection transformation method capable of reducing power failure time | |
| CN110277771B (en) | Method for improving short-circuit current breaking capacity of transformer substation in T connection mode | |
| CN104218457A (en) | Power distribution device and electric master system thereof | |
| CN206364435U (en) | GIS buses standby spacing does not have a power failure enlarging functional module | |
| CN111435784A (en) | Alternating current and direct current protection system and protection action outlet speed increasing method | |
| CN110445044B (en) | Transformation station transformation method for single-bus operation | |
| CN211089136U (en) | 6kV house service power interconnection device | |
| CN209748180U (en) | Electric power system backup power supply bus protection transformation system | |
| CN110943535A (en) | Power supply control system | |
| CN216721001U (en) | Power supply system of auxiliary safety power supply of nuclear power station | |
| CN204835231U (en) | Mix wiring high voltage power distribution device | |
| CN112701609B (en) | High-voltage line power failure maintenance method, system and related device | |
| CN115549041B (en) | Unmanned electric power system and control method | |
| CN112904134B (en) | Backup automatic switching device uninterrupted power check device, backup automatic switching device and backup automatic switching method | |
| CN215733469U (en) | Ring network self-healing system based on optical fiber differential | |
| Zhou et al. | Research on an Intelligent Distributed Feeder Automation Dynamic Testing System | |
| CN219697303U (en) | Bus residual voltage temporary electricity holding device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |