CN113507072B - Method for replacing 10kV relay protection device in live mode - Google Patents
Method for replacing 10kV relay protection device in live mode Download PDFInfo
- Publication number
- CN113507072B CN113507072B CN202110754119.8A CN202110754119A CN113507072B CN 113507072 B CN113507072 B CN 113507072B CN 202110754119 A CN202110754119 A CN 202110754119A CN 113507072 B CN113507072 B CN 113507072B
- Authority
- CN
- China
- Prior art keywords
- protection device
- relay protection
- phase
- temporary
- current
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 230000007935 neutral effect Effects 0.000 claims abstract description 8
- 230000006870 function Effects 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 13
- 230000016507 interphase Effects 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 230000008447 perception Effects 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000011664 signaling Effects 0.000 claims description 3
- 230000005514 two-phase flow Effects 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
- 238000012423 maintenance Methods 0.000 description 10
- 230000007547 defect Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000013439 planning Methods 0.000 description 2
- 238000012384 transportation and delivery Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000010421 standard material Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
Abstract
A method for replacing a 10kV relay protection device in a live state, which can improve the reliability of power supply and effectively reduce the power failure time, is characterized in that a 10kV temporary relay protection device power supply and a tripping and closing loop are connected; the a-phase and c-phase current inflow ends are in short circuit at the protection side of the terminal strip; opening the current neutral point terminal connection piece; connecting the head of the A-phase CT of the temporary relay protection device at two sides of the A current terminal connecting piece; opening the A phase terminal connecting piece, and respectively connecting the A phase and the C phase of the temporary relay protection device in series in the corresponding phase current loop; short-circuiting the ends of the temporary relay protection devices Ia ', ib ' and Ic '; dismantling an original tripping and closing loop of the relay protection device, a device power supply and an alternating current loop; a new 10kV relay protection device is accessed; removing the neutral point short connecting sheet of the temporary relay protection device, and connecting and fastening the A-phase current terminal connecting sheet and the C-phase current terminal connecting sheet; adjusting the reclosing time to be 0.2-0.4 second to complete a switch transmission test; and removing the temporary relay protection device.
Description
Technical Field
The invention relates to the field of relay protection, in particular to a method for replacing a 10kV relay protection device in a live mode.
Background
Electric energy is the most basic energy source in modern society. Not only people's life needs electricity, and enterprise's production needs electricity, and the progress of whole human society needs electricity more. The development level of the power industry is an important mark of the state development degree. The large-area power failure accident not only causes serious damage to the power system, but also has great influence on national safety, social stability and production and life of people. In an electric power system, a relay protection device is an important defense line for the operation of a power grid, and plays a key role in ensuring the safe and stable operation of the electric power system, preventing faults from occurring and expanding. If the protection device has the problem of operation failure or misoperation, large-scale faults of the transformer substation and even the whole power grid system can be caused, and the influence is extremely bad.
Because the internal elements of the relay protection device are precise and the wiring is complex, the aging phenomenon is easy to occur after the equipment is continuously operated for a long time, and the safety of a power grid is threatened. Therefore, on the one hand, the protection device is regularly checked, and on the other hand, after 12-15 years of operation, the protection device must be replaced according to actual operation conditions.
The power supply mode in vast rural areas is radiation network power supply, about two thirds of substations can not carry out load transfer, and the protection device must be replaced in case of power failure. The power failure maintenance can reduce the reliability of a power supply line, cause insufficient power supply, disconnect the tie lines among systems and further influence the stability of the systems. In a distribution network, the optimal power distribution mode is changed due to the fact that a line is disconnected, for example, long-distance power transmission is achieved through a ring network and the like, the loss of the line is increased, the strict requirements of state network companies on the number of power outage users are met, and the current power outage replacement protection mode cannot meet the number of power outage users.
In order to reduce the influence of large-range and overlong power outage on the country, society and resident life, network and provincial companies issue related documents to perform lean management on distribution network equipment, reduce the power outage times and average power outage time of urban and rural users due to engineering transformation, regular inspection maintenance and other operations, and provide clear regulations on power supply reliability indexes, and the conventional power outage replacement protection mode method cannot meet the strict requirements of the network and provincial companies on the number of power outage users.
Disclosure of Invention
In order to improve the power supply reliability and effectively reduce the power failure time, the invention provides a method for replacing a 10kV relay protection device in a live mode. The operation is safe and reliable, the maintenance and the defect elimination of the equipment can be realized, the equipment can be kept in a continuous operation state, the stable operation of a power system is ensured, a user can obtain uninterrupted electric energy, the reliable and continuous power supply to the user can be ensured, and the electric energy loss is reduced. Due to the flexibility of the implementation of live working, personnel and mechanical energy can better undertake the tasks and work of line maintenance according to plan and balance, unnecessary overtime is reduced, and the workload of rush-repair overtime on holidays is also reduced. Therefore, live working can reduce the electric energy loss of the power grid.
The technical solution of the invention is as follows: a method for replacing a 10kV relay protection device in a live mode comprises the following steps:
step one, preparation before replacement:
before the live replacement of the protection device is carried out, the operation mode of a main transformer is split operation, the backup protection of the main transformer is put into the operation of the backup automatic switching of the bus coupler, the backup protection of the main transformer is put into operation to lock the backup automatic switching function of the bus coupler, the backup protection of the main transformer is temporarily set, namely the secondary time of main transformer tripping is reduced and is adjusted to be consistent with the time of bus coupler tripping when I occurs; the reclosing of the current line is stopped;
compiling a detailed operation instruction book, compiling the operation instruction book according to an operation ticket mode, writing each step of operation into the operation instruction book, taking each line as an operation step, filling line numbers and terminal plate numbers clearly, and printing a number pair item by item when each operation step is finished;
verifying whether the protection function of the new 10kV relay protection device is complete, checking whether a fixed value is correct and testing whether related secondary circuit wiring is correct, and ensuring that the equipment of the new 10kV relay protection device is intact before the operation of replacing the 10kV relay protection device with electricity; then, a 10kV temporary relay protection device power supply is connected to the positive electricity end and the negative electricity end of the terminal block;
thirdly, a 10kV temporary relay protection device tripping and closing loop is connected to the tripping positive end and the closing positive end of the terminal block;
step four, short-circuit the current inflow ends of the phases a and c at the protection side of the terminal strip, access the head of the phase B CT inside the 10kV temporary relay protection device, and connect the tail of the phase B CT to the current transformer side of the terminal strip, as shown in fig. 3:
step five, opening a current neutral point terminal connecting piece, wherein the current flowing into the B-phase CT of the 10kV temporary relay protection device is Ia + Ic and corresponds to the B-phase current of primary equipment, and at the moment, the original 10kV relay protection device and the 10kV temporary relay protection device can correctly reflect primary equipment faults when an AB and BC interphase short circuit occurs, and the original 10kV relay protection device can correctly act when an AC interphase short circuit occurs;
the first position of the A-phase CT of the 10kV temporary relay protection device is connected to two sides of the A-phase current terminal connecting piece, at the moment, the 10kV temporary relay protection device and the terminal row A-phase current terminal connecting piece are connected in parallel to divide a part of current, but finally, the current flows back to the A-phase CT of the original 10kV relay protection device, any two-phase short-circuit fault can correctly act in the whole process, and the protection is not lost;
step seven, the A phase terminal connecting piece is opened, the A phase of the 10kV temporary relay protection device is connected in series in the A phase current loop, and the original 10kV relay protection device and the original 10kV temporary relay protection device can correctly reflect the AB, AC and BC interphase short circuit fault; in the same operation, the C phase of the 10kV temporary relay protection device is connected into a current loop in series;
step eight, short-circuiting the terminals Ia ', ib ' and Ic ' of the 10kV temporary relay protection devices, wherein the current loop of the original 10kV relay protection device is short-circuited at the moment, no current flows, and the overcurrent of the A and C two-phase flows of the 10kV temporary relay protection devices has the same function as that of the original 10kV relay protection device and can protect any interphase short-circuit fault;
step nine, dismantling a tripping and closing loop and a device power supply of the original 10kV relay protection device;
step ten, sealing the terminal block of the original 10kV relay protection device by using Ia and Ic alternating current loop short circuits to prevent an open circuit, and removing the alternating current loop connection of the original 10kV relay protection device after the short circuit is sealed;
step eleven, connecting a power supply of a new 10kV relay protection device at the positive electricity end and the negative electricity end of the terminal strip;
step twelve, connecting a tripping and closing coil of a new 10kV relay protection device at a tripping positive end and a closing positive end of the terminal block;
step thirteen, removing the neutral point short connection piece of the 10kV temporary relay protection device, and connecting and fastening the A-phase and C-phase current terminal connection pieces, wherein the protection function of the process is the same as that of the 10kV temporary relay protection device, any fault type can be protected, and all current terminal connection pieces are recovered; after the new protection access is finished, checking the sampling value of the new 10kV relay protection device, ensuring that the new 10kV relay protection device operates normally, adjusting the reclosing time of the new 10kV relay protection device to be 0.2-0.4 second, finishing a switch transmission test, ensuring that the new 10kV relay protection device operates normally, and simultaneously realizing zero perception of a client;
step fourteen, dismantling all alternating current loops Ia and Ic of the 10kV temporary relay protection device;
and fifthly, removing a device power supply and a tripping and closing loop of the 10kV temporary relay protection device, and finishing replacement of the new 10kV relay protection device.
Further, when the 10kV temporary relay protection device tripping circuit is connected in the third step, the 10kV temporary relay protection device tripping circuit is connected in the original tripping circuit in parallel at the switch cabinet, and the 10kV temporary relay protection device power supply and the operating power supply are taken from the original operating power supply to be opened in the same section, so that the two sets of protection device tripping circuits can function simultaneously.
Further, when a 10kV temporary relay protection device alternating current loop is connected in the fourth step, a 10kV temporary relay protection device CT loop is connected to the alternating current loop CT incoming line side in an original CT terminal row loop in parallel at a switch cabinet, A, B, C and N of the 10kV temporary relay protection device are connected in series one by one, after all connection is completed, whether a CT loop N-phase closed connecting piece is on the current loop terminal row CT side is checked, after no error is detected, each phase terminal connecting piece is opened one by one, the 10kV temporary relay protection device and the original 10kV relay protection device are enabled to function simultaneously in the process of connecting in parallel of the alternating current loop, current is all connected into the 10kV temporary relay protection device after all the connecting pieces are opened, no current flows into the original 10kV relay protection device, the 10kV temporary relay protection device is formally enabled, and the original 10kV relay protection device is disabled.
Further, in the ninth step and the tenth step, when the original 10kV relay protection device is dismantled, the steps are as follows:
1. disconnecting the original 10kV relay protection device direct current remote signaling and controlling direct current;
2. checking that all cable cores have no voltage and all alternating current loops have no current and voltage;
3. and (4) dismantling the original 10kV relay protection device and the secondary cable.
Further, in the eleventh step and the twelfth step, a secondary loop of the new 10kV relay protection device is connected to a control signal cable, a current loop is not connected temporarily, an operating power supply is taken from the same-stage direct current air switch of the operating power supply of the 10kV temporary relay protection device, an operating and protecting tripping and closing loop is connected to a terminal block of an original loop, and a tripping loop of the new protection device and a tripping loop of the 10kV temporary relay protection device are simultaneously in action.
And step thirteen, putting the reclosing function of the new 10kV relay protection device into use, performing a switch transmission test by using a tester, and checking related action information by the centralized control center.
Further, in the thirteenth step, when a current loop of a new 10kV relay protection device is connected, the current loop of the new 10kV relay protection device is connected into the original alternating current loop one by one, after the connection piece of each phase terminal is closed one by one after the verification, the condition of the current flowing into the 10kV temporary relay protection device and the new 10kV relay protection device is checked after the connection piece is closed, so that the current flowing into the two sets of protection devices is the same, and the new protection device and the 10kV temporary relay protection device function simultaneously in the process of connecting the alternating current loops in parallel.
Further, step fourteen, the step when dismantling the 10kV temporary relay protection device is as follows:
1. dismantling a current loop of the 10kV temporary relay protection device, dismantling a phase to check the current inflow condition of a new 10kV relay protection device, and after all the parts are dismantled, checking the new 10kV relay protection device by a station background and a centralized control center to sample;
2. and (4) dismantling a 10kV temporary relay protection device tripping loop and an operation power supply and a device power supply.
The invention has the beneficial effects that:
1. the operation is safe and reliable, the maintenance and the defect elimination of the equipment can be realized, the equipment can be kept in a continuous operation state, the stable operation of a power system is ensured, a user can obtain uninterrupted electric energy, the reliable and continuous power supply to the user can be ensured, and the electric energy loss is reduced.
2. Due to the flexibility of hot-line work implementation, personnel and machinery can better bear tasks and work of line maintenance according to plans and balance, unnecessary overtime is reduced, and workload of rush repair overtime on holidays is also reduced. Therefore, live working can reduce the electric energy loss of the power grid.
3. The live replacement protection device is not limited by power failure time. The maintenance platform can work when the maintenance platform is convenient, and can ensure the maintenance planning and the maintenance quality.
4. The charged replacement protection device is not limited by the environment and the climate because the charged replacement protection device is carried out in the relay protection chamber, and the climate limitation does not exist.
5. The charged replacement of the protection device has great economic benefit, the charged replacement of the protection device can eliminate the defects of the relay protection device in time, and the charged replacement of the protection device has a positive effect on ensuring the safe operation of a power grid.
Drawings
FIG. 1 is a schematic diagram of an original 10kV relay protection device in an operating state;
FIG. 2 is a schematic diagram of a power supply connection of a 10kV temporary relay protection device;
FIG. 3 is a schematic wiring diagram of a tripping and closing loop of a temporary relay protection device connected to 10 kV;
FIG. 4 is a schematic diagram of connection of an AC circuit of a 10kV relay protection device during connection and disconnection;
fig. 5 is a schematic view of the terminal block terminal web open;
FIG. 6 is a schematic wiring diagram of an A-phase alternating current circuit of the 10kV temporary relay protection device;
FIG. 7 is a schematic wiring diagram of a C-shaped alternating current circuit of the 10kV temporary relay protection device;
FIG. 8 is a schematic diagram of a tripping and closing loop of an original 10kV relay protection device and a device power supply are removed;
FIG. 9 is a schematic diagram of a power supply connected to a new 10kV relay protection device;
FIG. 10 is a schematic diagram of the completion of the access of a new 10kV relay protection device;
fig. 11 is a schematic diagram of a tripping and closing loop of a 10kV temporary relay protection device and a device power supply which are removed.
Detailed Description
A method for replacing a 10kV relay protection device in a live mode comprises the following steps:
step one, as shown in fig. 1, preparation before replacement:
before the live replacement of the protection device is carried out, the operation mode of a main transformer is split operation, the backup protection of the main transformer is put into the operation of the backup automatic switching of the bus coupler, the backup protection of the main transformer is put into operation to lock the backup automatic switching function of the bus coupler, the backup protection of the main transformer is temporarily set, namely the secondary time of main transformer tripping is reduced and is adjusted to be consistent with the time of bus coupler tripping when I occurs; the reclosing of the line is stopped;
compiling a detailed operation instruction book, compiling the operation instruction book according to an operation ticket mode, writing each step of operation into the operation instruction book, taking each line as an operation step, clearly filling line numbers and terminal plate numbers, and checking the number item by item when each operation step is finished;
step two, as shown in fig. 2, verifying whether the protection function of the new 10kV relay protection device is complete, checking whether the definite value is correct and testing whether the related secondary circuit wiring is correct, and ensuring that the new 10kV relay protection device is intact before the operation of replacing the 10kV relay protection device with power; then, a 10kV temporary relay protection device power supply is accessed to the positive end 201 and the negative end 202 of the terminal row;
step three, as shown in fig. 3, a 10kV temporary relay protection device tripping and closing loop is accessed to the terminal strip tripping positive end 237 and the closing positive end 207;
step four, as shown in fig. 4, the current inflow ends of the phases a and c are short-circuited at the protection side of the terminal strip, the head of the phase B CT in the 10kV temporary relay protection device is accessed, and the tail of the phase B CT is connected to the current transformer side of the terminal strip:
step five, as shown in fig. 5, opening a current neutral point terminal connecting piece, wherein the current flowing into the phase B CT of the 10kV temporary relay protection device is Ia + Ic and corresponds to the phase B current of primary equipment, and at the moment, the original 10kV relay protection device and the 10kV temporary relay protection device can both correctly reflect primary equipment faults when an AB and BC interphase short circuit occurs, and the original 10kV relay protection device can correctly act when an AC interphase short circuit occurs;
sixthly, as shown in fig. 6, connecting the first position of the phase-A CT of the 10kV temporary relay protection device to two sides of the phase-A current terminal connecting piece, wherein the 10kV temporary relay protection device and the terminal row phase-A current terminal connecting piece are connected in parallel to divide a part of current, but finally the current flows back to the phase-A CT of the original 10kV relay protection device, any two-phase short circuit fault can correctly act in the whole process, and the protection is not lost;
seventhly, as shown in fig. 7, the phase A terminal connecting piece is opened, the phase A of the 10kV temporary relay protection device is connected in series in the phase A current loop, and the original 10kV relay protection device and the original 10kV temporary relay protection device can correctly reflect the AB, AC and BC interphase short-circuit fault; in the same operation, the C phase of the 10kV temporary relay protection device is connected into a current loop in series;
step eight, as shown in fig. 3, the terminals Ia ', ib ', ic ' of the 10kV temporary relay protection devices are short-circuited, and at this time, the current loop of the original 10kV relay protection device is short-circuited, no current flows, and the two-phase flow of the 10kV temporary relay protection devices a and C is over-current, and the function of the temporary relay protection device is the same as that of the original 10kV relay protection device, so that any phase short-circuit fault can be protected;
step nine, as shown in fig. 8, removing a tripping and closing loop and a device power supply of the original 10kV relay protection device;
step ten, as shown in fig. 4, sealing the terminal block of the original 10kV relay protection device with a short circuit of the Ia and Ic alternating current loops to prevent an open circuit, and removing the connection wire of the original 10kV relay protection device alternating current loop after sealing the short circuit;
step eleven, as shown in fig. 9, a new 10kV relay protection device power supply is connected to the positive terminal 201 and the negative terminal 202 of the terminal row;
step twelve, as shown in fig. 4, a tripping and closing coil of the new 10kV relay protection device is connected to the tripping and positive end 237 and the closing and positive end 207 of the terminal block;
step thirteen, as shown in fig. 10, the neutral point short connection piece of the 10kV temporary relay protection device is removed, and the connection pieces of the a-phase current terminals and the C-phase current terminals are connected and fastened, the protection function in the process is the same as that when the 10kV temporary relay protection device is connected, any fault type can be protected, and all the connection pieces of the current terminals are recovered; after the new protection access is completed, checking the sampling value of the new 10kV relay protection device to ensure that the new 10kV relay protection device operates normally, adjusting the reclosing time of the new 10kV relay protection device to be 0.2-0.4 seconds, completing a switch transmission test, ensuring that the new 10kV relay protection device operates normally, and simultaneously realizing zero perception of a client;
fourteen, as shown in fig. 4, dismantling all the alternating current loops Ia and Ic of the 10kV temporary relay protection device;
and step fifteen, as shown in fig. 11, removing the device power supply and the tripping and closing loop of the 10kV temporary relay protection device, and completing replacement of the new 10kV relay protection device.
Further, when the 10kV temporary relay protection device tripping circuit is connected in the third step, the 10kV temporary relay protection device tripping circuit is connected in parallel with the original tripping circuit at the switch cabinet, and the 10kV temporary relay protection device power supply and the operating power supply are taken from the original operating power supply and are switched on in the same section, so that the two sets of protection device tripping circuits are simultaneously operated.
Further, when a 10kV temporary relay protection device alternating current loop is connected in the fourth step, a 10kV temporary relay protection device CT loop is connected to the alternating current loop CT incoming line side in an original CT terminal row loop in parallel at a switch cabinet, A, B, C and N of the 10kV temporary relay protection device are connected in series one by one, after all connection is completed, whether a CT loop N-phase closed connecting piece is on the current loop terminal row CT side is checked, after no error is detected, each phase terminal connecting piece is opened one by one, the 10kV temporary relay protection device and the original 10kV relay protection device are enabled to function simultaneously in the process of connecting in parallel of the alternating current loop, current is all connected into the 10kV temporary relay protection device after all the connecting pieces are opened, no current flows into the original 10kV relay protection device, the 10kV temporary relay protection device is formally enabled, and the original 10kV relay protection device is disabled.
Further, in the ninth step and the tenth step, when the original 10kV relay protection device is dismounted, the steps are as follows:
1. disconnecting the original 10kV relay protection device direct current remote signaling and controlling direct current;
2. checking that all cable cores have no voltage, and all alternating current loops have no current and voltage;
3. and (4) dismantling the original 10kV relay protection device and the secondary cable.
Further, in the eleventh step and the twelfth step, a secondary loop of the new 10kV relay protection device is connected to a control signal cable, a current loop is not connected temporarily, an operating power supply is taken from the same-stage direct current air switch of the operating power supply of the 10kV temporary relay protection device, an operating and protecting tripping and closing loop is connected to a terminal block of an original loop, and a tripping loop of the new protection device and a tripping loop of the 10kV temporary relay protection device are simultaneously in action.
And further, in the thirteen step, the reclosing function of the new 10kV relay protection device is put into use, a tester is used for carrying out a switch transmission test, and the centralized control center checks related action information.
Further, in the thirteenth step, when a current loop of a new 10kV relay protection device is connected, the current loop of the new 10kV relay protection device is connected into the original alternating current loop one by one, after the connection piece of each phase terminal is closed one by one after the verification, the condition of the current flowing into the 10kV temporary relay protection device and the new 10kV relay protection device is checked after the connection piece is closed, so that the current flowing into the two sets of protection devices is the same, and the new protection device and the 10kV temporary relay protection device function simultaneously in the process of connecting the alternating current loops in parallel.
Further, in the fourteenth step, the step of dismantling the 10kV temporary relay protection device is as follows:
1. dismantling a current loop of the 10kV temporary relay protection device, dismantling a phase to check the current flowing condition of a new 10kV relay protection device, and after all the current loops are dismantled, checking the new 10kV relay protection device by a station background and a centralized control center to sample;
2. and (4) dismantling a 10kV temporary relay protection device tripping loop, an operation power supply and a device power supply.
The specific operation process comprises the following steps:
1. personnel configuration:
the operator: and 1 is responsible for protecting the work of replacing, disassembling and wiring.
A ticket player: and 1 is responsible for reading the live replacement protection operation ticket. Reading the items one by one, after 1 item is read, replying by an operator, after the replying, carrying out wiring dismantling work, after the work is finished, reporting to be finished, drawing a check on the work item by a ticket player, and then reading the next item.
Job leader (guardian): and 1 is responsible for the field safety and technical supervision of the whole work.
And (4) arrival at the right place: 1 name (auxiliary main ren and above)
An assistant: the 1 machine is responsible for delivery of tools, instruments, meters and the like, old cable dismantling, device recycling, secondary line access and other delivery work.
2. Standard tools and instruments:
1. 1 screwdriver (straight) handle with insulating sheath
2. 1 handle of screwdriver (cross) with insulating sheath
3. Wire stripper 1 handle
4. Eccentric 1 handle
5. Thread embossing machine 1
6. Insulating stool 1 each (height 400MM, length 800, width 400)
7. 1 tool car
8. 1 waste article recovery box
9. 10kV temporary relay protection device 1
10. 2 analog circuit breakers
11. Fixed value of single 1 portion
12. Big pliers 1 handle
13. Test screw type plug 10
14. Universal meter 1
15. Clamp type ammeter 1
16. Relay protection tester 1
3. Standard material
1. Insulating tape 2 roll
2. 1 bag of 20mm ribbon
4. Live replacement protection operation ticket
And (3) work tasks: planning time:
job principal (guardian): the signature operator: sign
A ticket player: signing: an assistant: signing:
and (4) arrival in place: signing:
the above description is only exemplary of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for replacing a 10kV relay protection device in a live manner is characterized by comprising the following steps: the method comprises the following steps:
step one, preparation before replacement:
before the live replacement of the protection device is implemented, the operation mode of the main transformer is split operation, during the starting of the bus tie spare power automatic switching, the main transformer backup protection is put into use to lock the bus tie spare power automatic switching function, the main transformer backup protection starts a temporary fixed value, namely the secondary time of main transformer tripping is reduced, and the time is adjusted to be consistent with the time of bus tie tripping in I time; the reclosing of the line is stopped;
compiling a detailed operation instruction book, compiling the operation instruction book according to an operation ticket mode, writing each step of operation into the operation instruction book, taking each line as an operation step, filling line numbers and terminal plate numbers clearly, and printing a number pair item by item when each operation step is finished;
verifying whether the protection function of the new 10kV relay protection device is complete, checking whether a fixed value is correct and testing whether the wiring of a related secondary circuit is correct, and ensuring that the equipment of the new 10kV relay protection device is intact before the operation of replacing the 10kV relay protection device with electricity; then, a 10kV temporary relay protection device power supply is connected to the positive electricity end and the negative electricity end of the terminal block;
thirdly, a 10kV temporary relay protection device tripping and closing loop is connected to the tripping positive end and the closing positive end of the terminal block;
fourthly, the current inflow ends Ia and Ic of the phase a and the phase c are in short circuit at the protection side of the terminal block, the head of a phase B CT in the 10kV temporary relay protection device is accessed, and the tail of the phase B CT is connected to the side of a current transformer of the terminal block:
step five, opening a current neutral point terminal connecting piece, wherein the current flowing into the B-phase CT of the 10kV temporary relay protection device is Ia + Ic and corresponds to the B-phase current of primary equipment, the original 10kV relay protection device and the 10kV temporary relay protection device can correctly reflect primary equipment faults when AB and BC interphase short circuit occurs at the moment, and the original 10kV relay protection device can correctly act when AC interphase short circuit occurs;
step six, connecting the first position of the A-phase CT of the 10kV temporary relay protection device to two sides of the A-phase current terminal connecting piece, connecting the 10kV temporary relay protection device and the terminal row A-phase current terminal connecting piece in parallel to divide a part of current, and finally returning the current to the A-phase CT of the original 10kV relay protection device, wherein any two-phase short-circuit fault can correctly act in the whole process, and the protection is not lost;
step seven, opening the A phase terminal connecting piece, and connecting the A phase of the 10kV temporary relay protection device in series in the A phase current loop; c phase terminal connecting pieces are opened, a C phase of the 10kV temporary relay protection device is connected in series in a C phase current loop, and the original 10kV relay protection device and the original 10kV temporary relay protection device can correctly reflect AB, AC and BC interphase short-circuit faults;
step eight, short-circuiting the terminals Ia ', ib ' and Ic ' of the 10kV temporary relay protection devices, wherein the current loop of the original 10kV relay protection device is short-circuited at the moment, no current flows, and the overcurrent of the A and C two-phase flows of the 10kV temporary relay protection devices has the same function as that of the original 10kV relay protection device and can protect any interphase short-circuit fault;
step nine, dismantling a tripping and closing loop of the original 10kV relay protection device;
step ten, sealing the terminal block of the original 10kV relay protection device by the Ia and Ic alternating current circuit short circuit to prevent an open circuit, and removing the connection wire of the alternating current circuit of the original 10kV relay protection device after the short circuit is sealed;
step eleven, connecting a new 10kV relay protection device power supply to the positive electricity end and the negative electricity end of the terminal strip;
step twelve, connecting a tripping and closing coil of a new 10kV relay protection device at a tripping positive end and a closing positive end of the terminal block;
thirteen, dismantling a neutral point short connecting sheet of the 10kV temporary relay protection device, and connecting and fastening the A-phase and C-phase current terminal connecting sheets, wherein the protection function of the new relay protection device is the same as that when the 10kV temporary relay protection device is connected, any fault type can be protected, and all current terminal connecting sheets are recovered; after the new relay protection device is connected, checking the sampling value of the new 10kV relay protection device to ensure that the new 10kV relay protection device operates normally, adjusting the reclosing time of the new 10kV relay protection device to be 0.2-0.4 second, completing a switch transmission test, ensuring that the new 10kV relay protection device operates normally, and simultaneously realizing zero perception of a client;
step fourteen, dismantling all alternating current loops Ia and Ic of the 10kV temporary relay protection device;
and fifthly, removing a device power supply and a tripping and closing loop of the 10kV temporary relay protection device, and finishing replacement of the new 10kV relay protection device.
2. The method for live replacement of the 10kV relay protection device according to claim 1, wherein the method comprises the following steps: when the 10kV temporary relay protection device tripping circuit is connected in the third step, the 10kV temporary relay protection device tripping circuit is connected in parallel in the original tripping circuit at the switch cabinet, and the 10kV temporary relay protection device power supply and the operating power supply are taken from the original operating power supply and are opened in the same section, so that the two sets of protection device tripping circuits are simultaneously operated.
3. The method for live replacement of the 10kV relay protection device according to claim 1, wherein the method comprises the following steps: in the tenth step, when the original 10kV relay protection device is dismantled, the steps are as follows:
step 1) disconnecting the original 10kV relay protection device direct current remote signaling and controlling direct current;
step 2) checking that all cable cores have no voltage and all alternating current loops have no current and voltage;
and 3) dismantling the original 10kV relay protection device and the secondary cable.
4. The method for live replacement of the 10kV relay protection device according to claim 1, wherein the method comprises the following steps: and step twelve, connecting a secondary circuit of the new 10kV relay protection device to a control signal cable, temporarily disconnecting a current circuit, taking an operating power supply from the same-section direct current air switch of the operating power supply of the 10kV temporary relay protection device, connecting an operation and protection tripping and closing circuit to a terminal row of an original circuit, and simultaneously enabling the new 10kV relay protection device and the tripping circuit of the 10kV temporary relay protection device to function.
5. The method for live replacement of the 10kV relay protection device according to claim 1, wherein the method comprises the following steps: and step thirteen, putting the reclosing function of the new 10kV relay protection device into use, performing a switch transmission test by using a tester, and checking related action information by the centralized control center.
6. The method for live replacement of the 10kV relay protection device according to claim 1, wherein the method comprises the following steps: and thirteen steps, when a new 10kV relay protection device is connected, connecting the current loop of the new 10kV relay protection device into the original alternating current loop one by one, closing the terminal connecting piece of each phase one by one after verification, checking the current inflow conditions of the 10kV temporary relay protection device and the new 10kV relay protection device after the connecting piece is closed, enabling the currents flowing into the two sets of protection devices to be the same, and enabling the new 10kV relay protection device and the 10kV temporary relay protection device to play roles simultaneously in the process of connecting the alternating current loops in parallel.
7. The method for live replacement of the 10kV relay protection device according to claim 1, wherein the method comprises the following steps: step fourteen, the steps when the 10kV temporary relay protection device is dismantled are as follows:
step 14.1) dismantling a current loop of the 10kV temporary relay protection device, dismantling one phase to check the current inflow condition of a new 10kV relay protection device, and after all the current loops are dismantled, checking the new 10kV relay protection device by a station background and a centralized control center to sample;
and 14.2) dismantling a 10kV temporary relay protection device tripping loop and an operation power supply and a device power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110754119.8A CN113507072B (en) | 2021-07-04 | 2021-07-04 | Method for replacing 10kV relay protection device in live mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110754119.8A CN113507072B (en) | 2021-07-04 | 2021-07-04 | Method for replacing 10kV relay protection device in live mode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113507072A CN113507072A (en) | 2021-10-15 |
| CN113507072B true CN113507072B (en) | 2023-02-14 |
Family
ID=78011157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110754119.8A Active CN113507072B (en) | 2021-07-04 | 2021-07-04 | Method for replacing 10kV relay protection device in live mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113507072B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991616B (en) * | 2021-11-12 | 2023-05-30 | 国网辽宁省电力有限公司检修分公司 | Bus protection equipment replacement method based on double bus wiring mode |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070059273A (en) * | 2005-12-06 | 2007-06-12 | 삼성광주전자 주식회사 | Power supply apparatus |
| CN103887776A (en) * | 2014-03-28 | 2014-06-25 | 国家电网公司 | Protective device defect eliminating coordination instrument without circuit power outage |
| CN107834413A (en) * | 2017-12-04 | 2018-03-23 | 国家电网公司 | The device and charging construction method of protection device charged for replacement |
| CN110932227A (en) * | 2019-12-11 | 2020-03-27 | 国网河北省电力有限公司邯郸市肥乡区供电分公司 | Method for replacing protection device without power outage |
| CN112582995A (en) * | 2020-12-17 | 2021-03-30 | 广州发展电力科技有限公司 | Circuit breaker three-phase inconsistent protection device |
-
2021
- 2021-07-04 CN CN202110754119.8A patent/CN113507072B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070059273A (en) * | 2005-12-06 | 2007-06-12 | 삼성광주전자 주식회사 | Power supply apparatus |
| CN103887776A (en) * | 2014-03-28 | 2014-06-25 | 国家电网公司 | Protective device defect eliminating coordination instrument without circuit power outage |
| CN107834413A (en) * | 2017-12-04 | 2018-03-23 | 国家电网公司 | The device and charging construction method of protection device charged for replacement |
| CN110932227A (en) * | 2019-12-11 | 2020-03-27 | 国网河北省电力有限公司邯郸市肥乡区供电分公司 | Method for replacing protection device without power outage |
| CN112582995A (en) * | 2020-12-17 | 2021-03-30 | 广州发展电力科技有限公司 | Circuit breaker three-phase inconsistent protection device |
Non-Patent Citations (1)
| Title |
|---|
| "智能变电站不停电保护校验技术应用";周景;《内蒙古电力技术》;20200430;第66-68页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113507072A (en) | 2021-10-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Elmore | Protective relaying: theory and applications | |
| CN102780234B (en) | High-voltage electric debugging method for power generation project | |
| CN101304170A (en) | System debug method for high voltage direct current transmission project | |
| CN102280864B (en) | Post-failure live treatment method for protection device of distribution network system and portable protection device | |
| CN113507072B (en) | Method for replacing 10kV relay protection device in live mode | |
| CN109950822B (en) | Uninterrupted replacing method for 110KV one-power one-charging direct-current system | |
| CN107834413B (en) | Device for live replacement of protection device and live construction method | |
| CN109683106B (en) | Short circuit test system for different-capacity impact generator grid-connected power supply | |
| CN209543688U (en) | A kind of substation's experience system | |
| CN106885959B (en) | Test method for replacing short-circuit copper bar by grounding knife switch in power plant electric main start test | |
| CN112858958A (en) | Method for detecting current wiring polarity of high-backup-power-transformation protection device | |
| CN112216174A (en) | AC/DC power supply fault simulation system | |
| CN207782141U (en) | A kind of secondary voltage circuit and high-tension switch cabinet of PT | |
| CN202206125U (en) | Portable protection device for electrification process after distribution system protection device failure | |
| Khalyasmaa et al. | Improvement of short-circuit calculation results reliability for large electric power systems | |
| CN113325355A (en) | Portable on-site three-phase mutual inductor wiring judgment device | |
| CN117031171B (en) | Method for simulating polarity test of relay protection equipment without actual load | |
| Ivanković et al. | Line differential protection with synchrophasor data in WAMPAC system in control room | |
| CN218332933U (en) | Low-voltage distribution network troubleshooting simulation training device | |
| CN216750949U (en) | Portable integrated form electric transformation system | |
| Zeggai et al. | Power flow and Short circuit of a Real Eectrolysis Plant | |
| CN207490399U (en) | Microcomputer Protection live replacing device | |
| Li et al. | Protection Configuration and Circuit Optimization Schemes of 220kV Line Transformer Group | |
| Faulkner et al. | A Practical Fault Tolerance Assessment for Data Centre Rotary UPS Systems | |
| ENGIN et al. | PERFORMANCE ANAL COMBINED CYCLE POWER |
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 |