CN114725827A - 10kV line live-line breaker live-line voltage transformer disconnection and connection operation method - Google Patents
10kV line live-line breaker live-line voltage transformer disconnection and connection operation method Download PDFInfo
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
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Abstract
The invention discloses an operation method for a 10kV line live-line circuit breaker live-line voltage transformer, which comprises a bypass operation mode or a bypass shunt short-circuit mode. The working method of the 10kV line live disconnection and connection breaker with the voltage transformer can realize continuous power supply, improve the power supply reliability and the integrity of power supply enterprises, greatly reduce the complaint rate, create more production values for industrial users and improve the life quality of resident users; meanwhile, due to the flexible operation mode, the circuit can be guaranteed to be uninterrupted under the load, the complicated power failure procedures are shortened, the defect elimination and installation work of equipment can be arranged in real time, the operation violation risk is avoided, the direct disconnection and connection of a current lead wire of a voltage transformer are reduced and even avoided, the power supply reliability of the equipment is improved, the working hour efficiency and the operation safety performance of the operation are improved, and the reliability of the operation of the distribution network circuit is improved, so that the distribution network circuit has good social, economic and technical effect application prospects.
Description
Technical Field
The invention relates to the technical field of power grid maintenance, in particular to an operation method for a 10kV circuit live disconnection and connection breaker live voltage transformer.
Background
With the requirements of distribution network automation, self-healing lines, electric selling device construction and the like, a combined (voltage and current) transformer is connected to the power supply side and the load side of the 10kV distribution line breaker. Because of equipment fixing design standard is not unified in earlier stage, the standard, consider the secondary side not outage during the construction, directly with mutual-inductor access line, do not set up the on-off control mutual-inductor, do not consider live working and maintenance mode, in addition, accept and accept not standardizedly, lead to directly developing the live working and break off, connect the operation of lead wire, voltage transformer secondary side wiring is incorrect or ground connection is not good, probably will cause voltage transformer secondary side to open a way or the short circuit behind the disconnection one-phase lead wire, in case the short circuit takes place for the voltage transformer secondary side then will produce very big short-circuit current, finally lead to the mutual-inductor to burn out or explode, there is great potential safety hazard, will seriously threaten operating personnel and line equipment operation safety.
Disclosure of Invention
The invention aims to provide an operation method for a 10kV line live disconnection and connection breaker with a voltage transformer, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
an operation method of a 10kV line live disconnection and connection breaker live voltage transformer specifically comprises the step of adopting a bypass operation mode or a bypass shunt short circuit mode.
Preferably, the bypass operation mode specifically includes the steps of:
s11: selecting a bypass down-lead cable, a switch and current-carrying capacities of two end wire clamps used for bypass operation to meet the requirement of maximum load current, and checking the phase to be correct;
s12: arranging bypass systems on a power supply side and a load side of the circuit breaker, switching on a bypass load switch to form a bypass system, and confirming that the bypass system is normal in through-flow;
s13: an arc suppression rod is adopted to electrically disconnect a current leading wire of a breaker at the power supply side, the fixation is firm, and the insulation shielding is recovered;
s14: the insulating operating rod is used for disconnecting the circuit breaker, the isolating switch is pulled open, and the power supply of the voltage transformer is disconnected by utilizing the principle that the circuit breaker is on and off in the same way and loads are disconnected;
s15: the arc suppression rod is adopted to electrically disconnect the current-conducting wire of the circuit breaker on the load side, and the current-conducting wire is firmly fixed;
s16: and disconnecting the set bypass load switch, confirming that the bypass load switch is at the opening position, checking whether the bypass system has current or not, and detaching the set bypass system.
Preferably, the bypass shunt short circuit mode specifically includes the following steps:
s21: selecting a bypass shunt line used for on-load operation and the current-carrying capacity of the wire clamps at two ends to meet the requirement of maximum load current;
s22: the phase position must be checked before the bypass shunt line is electrified to short-circuit the drainage lines on the two sides of the breaker, the breaker is confirmed to be in a closing position or the through flow is normal before the short circuit, and the breaker is withdrawn from the protection device;
s23: after the bypass shunt line is installed, fixing measures are taken to prevent swinging, and the bypass shunt line is confirmed to be normal in through-flow;
s24: an arc suppression rod is adopted to electrically disconnect a current leading wire of a breaker at the power supply side, and the current leading wire is firmly fixed and the insulation shielding is recovered;
s25: the insulating operating rod is used for disconnecting the circuit breaker, the isolating switch is pulled open, and the power supply of the voltage transformer is disconnected by utilizing the principle that the circuit breaker is on and off in the same way and loads are disconnected;
s26: disconnecting the voltage transformer and connecting the current-conducting wire with the circuit breaker, and overlapping the current-conducting wire of the circuit breaker at the wire inlet side by adopting an arc suppression rod in a charged manner;
s27: closing the circuit breaker and the isolating switch by using an insulating operating rod, checking that the circuit breaker is normal in through-flow, and removing the arranged bypass shunt line;
s28: the insulating operating rod is used for disconnecting the circuit breaker, the isolating switch is pulled open, the arc extinguishing rod is used for electrically disconnecting the current-guiding wire of the circuit breaker on the wire inlet side, and the current-guiding wire is firmly fixed.
Preferably, the insulation shielding in step S13 and step S24 is performed specifically by performing insulation shielding from near to far and from bottom to top, the overlapped portion of the shielding is not less than 15cm, inspection is performed after the shielding is completed, and the insulation shielding is removed by performing grounding and then charging from top to bottom and from far to near.
Preferably, the circuit breaker in steps S14 and S25 is a distribution automation circuit breaker.
Preferably, the bypass drop cable access specifically comprises the following steps: the insulating cross arm is installed and supported, and the bypass down-leading cable is installed on the insulating bracket and is firmly fixed; before overlapping, the circuit breaker is confirmed to be at a switching-on position, the load switch of the bypass system is overlapped at a switching-off position, and the phase sequence is correct; removing the oxide on the surface of the access point, ensuring firm and reliable wire clamp contact and recovering the insulation shielding of the access point; and measuring the load current of the line and the bypass system phase by phase to confirm that the through current is normal.
Preferably, the step of disconnecting the power supply side drainage wire of the circuit breaker specifically comprises the following steps: confirming that the transfer of the bypass system is completed, and disconnecting a power supply side drainage wire of the circuit breaker by an operator in the bucket by using an insulating arc suppression rod; and the voltage transformer on the power supply side of the circuit breaker is ensured not to lose power, and the power supply of the voltage transformer is supplied by the load side at the moment.
Preferably, opening the circuit breaker to open the disconnector specifically comprises the steps of: an operator in the bucket uses the insulating operating rod to break the breaker to pull open the isolating switch; the power supply of the voltage transformer is disconnected by utilizing the principle that the circuit breaker is used for simultaneously opening and closing and breaking loads.
Compared with the prior art, the invention has the beneficial effects that: the working method of the 10kV line live disconnection and connection breaker with the voltage transformer can realize continuous power supply, improve the power supply reliability and the integrity of power supply enterprises, greatly reduce the complaint rate, create more production values for industrial users and improve the life quality of resident users; meanwhile, due to the flexible operation mode, the circuit can be guaranteed to be uninterrupted under the load, the complicated power failure procedures are shortened, the equipment defect elimination and installation work can be arranged immediately, the operation violation risk is avoided, the direct disconnection and connection of a current lead of the transformer with the voltage is reduced and even avoided, and the power supply reliability of the equipment is improved. In order to improve the working hour efficiency and the operation safety performance of the operation and improve the reliability of the operation of the distribution network line, the method has good social, economic and technical effect application prospects.
Drawings
FIG. 1 is a schematic diagram of the circuit connection of the present invention using a bypass operation;
fig. 2 is a schematic diagram of the circuit connection in the bypass shunt short circuit mode according to the present invention.
The meaning of each reference number in the figures is:
10. a bypass load switch; 20. a control box; 30. a circuit breaker; 40. an isolating switch; 50. a load side; 60. a power supply side; 70. a voltage transformer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The utility model provides a 10kV circuit takes electric break, connects circuit breaker to take voltage transformer operation method, this embodiment adopts the bypass operation mode, specifically includes following step:
s11: selecting a bypass down-lead cable, a switch and current-carrying capacities of two-end wire clamps used for bypass operation to meet the requirement of maximum load current, and checking the phase to be correct;
s12: arranging bypass systems on a power supply side and a load side of the circuit breaker, switching on a bypass load switch to form a bypass system, and confirming that the bypass system is normal in through-flow;
s13: an arc suppression rod is adopted to electrically disconnect a current leading wire of a breaker at the power supply side, the fixation is firm, and the insulation shielding is recovered;
s14: the insulating operating rod is used for disconnecting the circuit breaker, the isolating switch is pulled open, and the power supply of the voltage transformer is disconnected by utilizing the principle that the circuit breaker is on and off in the same way and loads are disconnected;
s15: the arc suppression rod is adopted to electrically disconnect the current-conducting wire of the circuit breaker on the load side, and the current-conducting wire is firmly fixed;
s16: and disconnecting the set bypass load switch, confirming that the bypass load switch is at the opening position, checking whether the bypass system has current or not, and detaching the set bypass system.
In this embodiment, the insulating shielding in step S13 is specifically insulating shielding according to a principle of from near to far and from bottom to top, the overlapping shielding portion should not be smaller than 15cm, inspection and confirmation are performed after the shielding is completed, the insulating shielding is removed according to a principle of from top to bottom, from far to near, grounding first and then charging, and the circuit breaker in step S14 is a distribution automation circuit breaker.
Further, the bypass drop cable access specifically comprises the following steps: the insulating cross arm is installed and supported, and the bypass down-leading cable is installed on the insulating bracket and is firmly fixed; before overlapping, the circuit breaker is confirmed to be at a switching-on position, the load switch of the bypass system is overlapped at a switching-off position, and the phase sequence is correct; removing the oxide on the surface of the access point, ensuring firm and reliable wire clamp contact and recovering the insulation shielding of the access point; and measuring the load current of the line and the bypass system phase by phase to confirm that the through current is normal.
Specifically, the step of disconnecting the power supply side drainage wire of the circuit breaker specifically comprises the following steps: confirming that the transfer of the bypass system is completed, and disconnecting a power supply side drainage wire of the circuit breaker by an operator in the bucket by using an insulating arc suppression rod; and the voltage transformer on the power supply side of the circuit breaker is ensured not to lose power, and the power supply of the voltage transformer is supplied by the load side at the moment.
It should be noted that opening the circuit breaker to open the disconnector specifically includes the following steps: an operator in the bucket uses the insulating operating rod to break the breaker to pull open the isolating switch; the power supply of the voltage transformer is disconnected by utilizing the principle that the circuit breaker is used for simultaneously opening and closing and breaking loads.
Example 2
The utility model provides a kV circuit takes electrical disconnection, connects circuit breaker and takes voltage transformer operation method, and this embodiment adopts bypass reposition of redundant personnel short circuit mode, specifically includes following step:
s21: selecting a bypass shunt line used for on-load operation and the current-carrying capacity of the wire clamps at two ends to meet the requirement of maximum load current;
s22: the phase position must be checked before the bypass shunt line is electrified to short-circuit the drainage lines on the two sides of the breaker, the breaker is confirmed to be in a closing position or the through flow is normal before the short circuit, and the breaker is withdrawn from the protection device;
s23: after the bypass shunt line is installed, fixing measures are taken to prevent swinging, and the bypass shunt line is confirmed to be normal in through flow;
s24: an arc suppression rod is adopted to electrically disconnect a current leading wire of a breaker at the power supply side, and the current leading wire is firmly fixed and the insulation shielding is recovered;
s25: the insulating operating rod is used for disconnecting the circuit breaker, the isolating switch is pulled open, and the power supply of the voltage transformer is disconnected by utilizing the principle that the circuit breaker is on and off in the same way and loads are disconnected;
s26: disconnecting the voltage transformer and connecting the current-conducting wire with the circuit breaker, and overlapping the current-conducting wire of the circuit breaker at the wire inlet side by adopting an arc suppression rod in a charged manner;
s27: closing the circuit breaker and the isolating switch by using an insulating operating rod, checking that the circuit breaker is normal in through-flow, and removing the arranged bypass shunt line;
s28: the insulating operating rod is used for disconnecting the circuit breaker, the isolating switch is pulled open, the arc extinguishing rod is used for electrically disconnecting the current-guiding wire of the circuit breaker on the wire inlet side, and the current-guiding wire is firmly fixed.
In this embodiment, the insulating shielding in step S24 is specifically insulating shielding according to a principle of from near to far and from bottom to top, the overlapping shielding portion should not be smaller than 15cm, inspection and confirmation are performed after the shielding is completed, the insulating shielding is removed according to a principle of from top to bottom, from far to near, grounding first and then charging, and the circuit breaker in step S25 is a distribution automation circuit breaker.
Further, the bypass drop cable access specifically comprises the following steps: the insulating cross arm is installed and supported, and the bypass down-leading cable is installed on the insulating bracket and is firmly fixed; the circuit breaker is confirmed to be at the switching-on position before the lap joint, the load switch of the bypass system is lapped at the switching-off position, and the phase sequence is correct; removing the oxide on the surface of the access point, ensuring firm and reliable wire clamp contact and recovering the insulation shielding of the access point; and measuring the load current of the line and the bypass system phase by phase to confirm that the through current is normal.
Specifically, the step of disconnecting the power supply side drainage wire of the circuit breaker specifically comprises the following steps: confirming that the transfer of the bypass system is completed, and disconnecting a power supply side drainage wire of the circuit breaker by an operator in the bucket by using an insulating arc suppression rod; and the voltage transformer on the power supply side of the circuit breaker is ensured not to lose power, and the power supply of the voltage transformer is supplied by the load side at the moment.
It should be noted that opening the circuit breaker to open the disconnector specifically includes the following steps: an operator in the bucket uses the insulating operating rod to break the breaker to pull open the isolating switch; the power supply of the voltage transformer is disconnected by utilizing the principle that the circuit breaker is used for simultaneously opening and closing and breaking loads.
First, operation flow and precontrol measure
1) Preparation of work in early stage
(1) And (3) field investigation: the job responsible personnel and related operation and maintenance units are organized according to the job requirements to carry out site investigation, and the conditions, the environment and other dangerous points influencing the job site are known.
(2) Weaving a construction scheme: the working responsible person can make targeted organization measures, safety measures and technical measures according to the on-site investigation result and the operation danger, complexity and difficulty degree.
(3) And consulting the related equipment information: and checking parameters of a line tower, a wire and equipment, a wiring mode of an operation line, looking up related breaker protection and model data, and determining that live working conditions are met.
(4) And (3) learning a construction scheme: the members of the organization work class learn the operation method, the construction scheme, the operation instruction book and the like according to the on-site survey result of the operation, and are familiar with the whole operation flow, the dangerous points and the precontrol measures.
2) Operation procedure and safety measures
(1) Through on-site reconnaissance: the name of the field operation line is consistent with the content of the work ticket, the field working condition is judged, and the meteorological condition of the working environment is as follows: live working should be performed in good weather. And in case of thunder, snow, hail, rain, fog and the like, live working is not required. When the wind power is more than 5 grades or the humidity is more than 80 percent, the live working is not suitable.
(2) Handling work approval procedure: the work responsible person and the work licensor (the scheduling) handle the work ticket permission procedure, implement various safety measures, apply for withdrawing from the reclosing of the substation operation line circuit breaker, and operate the point circuit breaker protection, the trip circuit and the locking trip mechanism. The work ticket is filled with the name of the work licensor (schedule) and the licensing time.
(3) Safe generation replacement: the working responsible person can read the work order from the working staff member, clear the division of work, give up safety measures, dangerous points, pre-control measures and the like, and execute the signature confirmation procedure.
(4) Arranging safety measures: when constructing urban areas, densely populated areas, traffic roads or traffic crossings, barriers (fences) should be installed around the workplace, and warning ranges or warning signs should be installed at corresponding positions, and warning light sources should be installed at night, and special persons should be dispatched to watch if necessary.
(5) Inspecting and detecting tools and materials: checking that the insulating tool is not damaged, and detecting the insulating gloves by using an insulating glove inflation detector within the test validity period; the insulation tool needs to carry out sectional insulation detection (the electrode width is 2cm, and the interelectrode width is 2cm) and the resistance value is not less than 700M omega; tools and instruments are placed on a dry and clean moisture-proof pad to avoid extrusion and collision, and insulating tools, metal tools and instruments and materials are placed in a classified manner; the operator should wear clean and dry gloves to prevent bare hands from contacting the insulating tool; wiping the insulated tool with a clean, dry cotton towel; and carrying out through-flow and insulation detection on the bypass equipment. The insulation resistance value thereof must not be less than 500M omega.
(6) Preparing an insulating bearing tool: the parking position of the insulating bucket arm vehicle should avoid nearby power lines and barriers, the supporting legs should not be placed on a channel cover plate, a backing plate or a sleeper should be used on the soft soil ground, the front and the back of the vehicle, the left and the right of the vehicle are horizontal, and four wheels of the vehicle should be lifted off the ground; the vehicle body is reliably grounded, and the grounding wire is not less than 25mm with a transparent sheath2The buried depth of the temporary grounding body of the stranded annealed copper wire is not less than 0.6 m; checking the insulating bucket and the insulating arm to confirm that the insulating bucket and the insulating arm are clean, crack-free and damage-free; the empty bucket test operation is carried out under the supervision of a specially-assigned person, the hydraulic transmission, rotation, lifting and stretching systems are confirmed to work normally, the operation is flexible, and the braking device is reliable; effective insulation of insulating arm of insulating bucket arm vehicle during operationThe edge length is not less than 1.0m, and the safety distance between the metal part and the charged body in the lifting and rotating process is not less than 0.9 m.
(7) Entering a live working station: live working personnel need to correctly wear personal insulating protective tools, correctly use safety belts and enter a station through an insulating carrying tool; the live working personnel use electroscopes with qualified corresponding voltage grades to test electricity on a live body and a grounding body of the equipment, and the electricity is tested phase by phase according to the principle of from bottom to top and from near to far during electricity testing; the operator checks that the equipment and the line in the operation range are in good state; and checking the load current of the leading (current) line of the circuit breaker, and confirming that the load current is in the application range of the bypass equipment.
(8) Insulating shielding: and carrying out insulation shielding according to the principle of from near to far and from bottom to top, wherein the overlapped part of the shielding is not less than 15cm, and carrying out inspection and confirmation after the shielding is finished.
(9) Connecting a bypass down-lead cable: the insulating cross arm is installed and supported, and the bypass down-leading cable is installed on the insulating bracket and is firmly fixed; the circuit breaker is confirmed to be at the switching-on position before the lap joint, and the load switch of the bypass system is at the switching-off position, so that the lap joint can be realized, and the phase sequence is correct; removing oxide on the surface of the access point, ensuring firm and reliable wire clamp contact and recovering the insulation shielding of the access point; and measuring the load current of the line and the bypass system phase by phase to confirm that the through current is normal.
(10) Disconnecting the power supply side drainage wire of the circuit breaker: confirming the completion of the transfer of the bypass system; an electrician in the bucket uses an insulating arc-extinguishing rod to break a power supply side drainage wire of a circuit breaker (a voltage transformer); ensuring that the voltage transformer on the power supply side of the circuit breaker does not lose power supply (at the moment, the power supply of the voltage transformer is supplied by the load side); the disconnected drainage wire must be reliably fixed and insulated and shielded from the charged part if necessary.
(11) Disconnecting the circuit breaker pulls the disconnector open: an electrician in the bucket uses an insulating operating rod to break a breaker to pull open a disconnecting switch; the power supply of the voltage transformer is disconnected by utilizing the principle that the circuit breakers are on and off simultaneously and can cut off the load.
(12) Breaking a load side drainage wire of the circuit breaker: an insulating arc extinguishing rod is adopted to disconnect the load side drainage wire of the circuit breaker phase by phase; the disconnected drainage wire must be reliably fixed.
(13) Replacing the circuit breaker: the circuit breaker and the voltage transformer are replaced and installed by a construction unit, the newly installed circuit breaker transformer is controlled by a disconnecting switch, the replaced circuit breaker is qualified through testing, if the circuit breaker is matched with a self switch, the related protection fixed value of a batch is input according to a mode single requirement, the circuit breaker is normally linked with dispatching communication and telemetering, and the circuit breaker and the voltage transformer can be input through the acceptance of an operation and maintenance unit.
(14) Two drainage wires of the lap joint breaker are measured: and before lapping, an oxide layer at the lapping point of the wire is removed, the breaker is confirmed to be in a tripping position, the disconnecting switches on the two sides are in a pulling-open position, and the breaker is protected to be in a withdrawing state.
(15) Closing the isolating switch and the breaker: and an electrician in the bucket closes the circuit breaker after closing the isolating switch by using the insulating operating rod, and detects that the through-flow of the circuit breaker is normal phase by phase.
(16) The bypass system exits the operation: operating the bypass load switch to a brake separating position and locking the operating handle; when the load switch is operated, the operation is carried out under the supervision of a specially-assigned person, and the person wears the insulating overshoes and the insulating gloves. And the disconnecting bypass down cable is connected with the main line, and the bypass system is discharged phase by phase and then recovered.
(17) Removing the insulating shield: the method is carried out according to the principle of grounding first and then electrifying from top to bottom and from far to near.
(18) And (4) operation inspection: and checking that the construction process meets the technical specification requirement and confirming that the construction process is qualified through operation and maintenance personnel.
(19) Exiting the live working station and cleaning the working site: the operator in the bucket confirms that no object remains on the rod and then safely returns to the ground, and the working responsible person checks and confirms that no object remains exists on the working site.
(20) The meeting after the shift is held: after the work is finished, the work responsible person organizes the meeting after the work staff takes the shift, analyzes the defects existing in the operation process, improves measures, matches the situation in the operation and the like.
(21) Ending the transaction work: the working responsible person reports to the working licensor (scheduling) in time, handles the working termination procedure, recovers the circuit breaker reclosing and puts into operation point breaker protection.
Secondly, the invention obtains the effect of the operation method of the electrified breaker and the electrified voltage transformer of the 10kV line,
| power off time/h | Load current/A | Loss of electricity/kwh | |
| Example 1 | 0.85 | 180 | 2517.5 |
| Example 2 | 0.9 | 180 | 2665.5 |
| Conventional | 4 | 180 | 11846.8 |
Project implementation benefits: the traditional mode of maintenance that has a power failure according to an operation scope calculates, must have the blackout time 4 hours, and load current calculates according to 180A:
the loss electric quantity is 180 x 1.732 x 10 x 0.95 x 4 x 11846.8 (kWh).
The working method of the 10kV line live disconnection and connection breaker with the voltage transformer can realize continuous power supply, improve the power supply reliability and the integrity of power supply enterprises, greatly reduce the complaint rate, create more production values for industrial users and improve the life quality of resident users; meanwhile, due to the flexible operation mode, the circuit can be guaranteed to be not powered off under the load, the complicated power failure procedures are shortened, the equipment can be arranged to be eliminated and installed in real time, the operation violation risk is avoided, the direct disconnection and connection of a current lead wire of a voltage transformer are reduced and even avoided, the power supply reliability of the equipment is improved, the working hour efficiency and the operation safety performance of the operation are improved, and the reliability of the operation of the distribution network circuit is improved, so that the method has a good application prospect.
The foregoing shows and describes the general principles, principal features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a 10kV circuit electrified disconnected, connect circuit breaker electrified voltage mutual-inductor operation method which characterized in that: the method specifically comprises the step of adopting a bypass operation mode or a bypass shunt short circuit mode.
2. The 10kV line live disconnection and connection breaker live voltage transformer operation method according to claim 1, characterized by comprising the following steps: the bypass operation mode specifically comprises the following steps:
s11: selecting a bypass down-lead cable, a switch and current-carrying capacities of two end wire clamps used for bypass operation to meet the requirement of maximum load current, and checking the phase to be correct;
s12: arranging bypass systems on a power supply side and a load side of the circuit breaker, switching on a bypass load switch to form a bypass system, and confirming that the bypass system is normal in through-flow;
s13: an arc suppression rod is adopted to electrically disconnect a current leading wire of a breaker at the power supply side, the fixation is firm, and the insulation shielding is recovered;
s14: the insulating operating rod is used for disconnecting the circuit breaker, the isolating switch is pulled open, and the power supply of the voltage transformer is disconnected by utilizing the principle that the circuit breaker is on and off in the same way and loads are disconnected;
s15: the arc suppression rod is adopted to electrically disconnect the current-conducting wire of the circuit breaker on the load side, and the current-conducting wire is firmly fixed;
s16: and disconnecting the set bypass load switch, confirming that the bypass load switch is at the opening position, checking whether the bypass system has current or not, and dismantling the set bypass system.
3. The 10kV line live disconnection and connection breaker live voltage transformer operation method according to claim 1, characterized by comprising the following steps: the bypass shunt short circuit mode specifically comprises the following steps:
s21: selecting a bypass shunt line used for on-load operation and the current-carrying capacity of the wire clamps at two ends to meet the requirement of maximum load current;
s22: the method comprises the following steps that a bypass shunt line is adopted to be electrified to short-circuit current-leading wires on two sides of a circuit breaker, the phase must be checked, the circuit breaker is confirmed to be in a switching-on position or the current is normal before short-circuit, and the circuit breaker exits from a protection device;
s23: after the bypass shunt line is installed, fixing measures are taken to prevent swinging, and the bypass shunt line is confirmed to be normal in through-flow;
s24: an arc suppression rod is adopted to electrically disconnect a current leading wire of a breaker at the power supply side, and the current leading wire is firmly fixed and the insulation shielding is recovered;
s25: the insulating operating rod is used for disconnecting the circuit breaker, the isolating switch is pulled open, and the power supply of the voltage transformer is disconnected by utilizing the principle that the circuit breaker is on and off in the same way and loads are disconnected;
s26: disconnecting the voltage transformer and connecting the current-conducting wire with the circuit breaker, and overlapping the current-conducting wire of the circuit breaker at the wire inlet side by adopting an arc suppression rod in a charged manner;
s27: closing the circuit breaker and the isolating switch by using an insulating operating rod, checking that the circuit breaker is normal in through-flow, and removing the arranged bypass shunt line;
s28: the insulating operating rod is used for disconnecting the circuit breaker, the isolating switch is pulled open, the arc extinguishing rod is used for electrically disconnecting the current-guiding wire of the circuit breaker on the wire inlet side, and the current-guiding wire is firmly fixed.
4. The 10kV line live disconnection and connection breaker live voltage transformer operation method according to claim 2 or 3, characterized by comprising the following steps: the insulating shielding in step S13 and step S24 is specifically performed according to a principle of shielding from near to far and from bottom to top, the overlapped part of the shielding is not less than 15cm, inspection and confirmation are performed after the shielding is completed, and the insulating shielding is removed according to a principle of grounding and then charging from top to bottom and from far to near.
5. The 10kV line live disconnection and connection breaker live voltage transformer operation method according to claim 2 or 3, characterized by comprising the following steps: the circuit breaker in the steps S14 and S25 adopts a distribution automation circuit breaker.
6. The 10kV line live disconnection and connection breaker live voltage transformer operation method according to claim 2 or 3, characterized by comprising the following steps: the access of the bypass down cable specifically comprises the following steps: the insulating cross arm is installed and supported, and the bypass down-leading cable is installed on the insulating bracket and is firmly fixed; before overlapping, the circuit breaker is confirmed to be at a switching-on position, the load switch of the bypass system is overlapped at a switching-off position, and the phase sequence is correct; removing the oxide on the surface of the access point, ensuring firm and reliable wire clamp contact and recovering the insulation shielding of the access point; and measuring the load current of the line and the bypass system phase by phase to confirm that the through current is normal.
7. The 10kV line live disconnection and connection breaker live voltage transformer operation method according to claim 2 or 3, characterized in that: the method for disconnecting the power supply side drainage wire of the circuit breaker specifically comprises the following steps: confirming that the transfer of the bypass system is completed, and disconnecting a power supply side drainage wire of the circuit breaker by an operator in the bucket by using an insulating arc suppression rod; and the voltage transformer on the power supply side of the circuit breaker is ensured not to lose power, and the power supply of the voltage transformer is supplied by the load side at the moment.
8. The 10kV line live disconnection and connection breaker live voltage transformer operation method according to claim 2 or 3, characterized by comprising the following steps: opening the circuit breaker to open the disconnector specifically comprises the following steps: an operator in the bucket uses the insulating operating rod to break the breaker to pull open the isolating switch; the power supply of the voltage transformer is disconnected by utilizing the principle that the circuit breaker is used for simultaneously opening and closing and breaking loads.
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| CN202210188845.2A CN114725827A (en) | 2022-02-28 | 2022-02-28 | 10kV line live-line breaker live-line voltage transformer disconnection and connection operation method |
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| CN202210188845.2A CN114725827A (en) | 2022-02-28 | 2022-02-28 | 10kV line live-line breaker live-line voltage transformer disconnection and connection operation method |
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