CN113746037B - Substation secondary wiring terminal row live-line replacement method - Google Patents
Substation secondary wiring terminal row live-line replacement method Download PDFInfo
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- CN113746037B CN113746037B CN202111135040.3A CN202111135040A CN113746037B CN 113746037 B CN113746037 B CN 113746037B CN 202111135040 A CN202111135040 A CN 202111135040A CN 113746037 B CN113746037 B CN 113746037B
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- 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
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
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Abstract
The invention discloses a live-line replacement method of a secondary wiring terminal strip of a transformer substation, which comprises the steps of firstly carrying out correct bypass drainage on a terminal strip by using a bypass drainage tool, then clamping a lead on one side of the terminal strip by using an insulating wire clamping tool, loosening a fastening screw by using an insulating screwdriver, loosening a metal head of the lead, then pulling out the lead, sleeving an insulating rubber cap on the metal head, then dismantling the lead on the other side of the terminal strip by using the same method, then taking down the terminal strip from a guide rail by using an insulating clamp and installing a new terminal strip, then respectively connecting two dismantled leads on the new terminal strip, then measuring whether the through-flow of the new terminal strip is normal by using a multimeter, if the through-flow is abnormal, checking the insertion depth of the lead in a wiring hole of the new terminal strip and the fastening of the fastening screw in place, if the through-flow is normal, dismantling the bypass drainage tool, and recovering the insulating encapsulation of the leads on two sides of the new terminal strip; the invention has the advantages of safety, reliability, timely and rapid treatment, and simple and easy operation.
Description
Technical Field
The invention belongs to the technical field of maintenance and repair of a secondary wiring terminal strip of a transformer substation, and particularly relates to a live replacement method of the secondary wiring terminal strip of the transformer substation.
Background
The secondary loop lead wire (current 5A, voltage 100V) led out from the secondary side of the breaker of the primary equipment of the transformer substation and the current transformer of the transformer is connected with the secondary middle and a terminal row and then connected with elements of different loops such as relay protection, metering and the like, the terminal row is provided with a secondary terminal chamber of a switch cabinet, an outdoor breaker mechanism box terminal and an outdoor terminal box, the terminal row is arranged in different places and is influenced by factors such as uneven current, contact reliability of a connection process, indoor and outdoor environment temperature and humidity, vibration force and the like, defects can occur in the operation process, the temperature of a terminal connection lead wire point can reach 75 ℃ or above and sometimes can reach 180-200 ℃ or above, so that the secondary current, voltage and signal data are abnormal, further equipment malfunction or failure occurs, and the normal operation of the transformer substation is seriously influenced.
In the inspection process of the secondary circuit terminal strip, if the condition is found, the defective terminal strip must be replaced in time, otherwise, a safety accident can occur, but the precondition for replacing the defective terminal strip is that the open circuit operation of the secondary circuit is not allowed and the short circuit of the secondary circuit is forbidden, and based on the requirement of safety, the terminal strip must be replaced under the condition of complete power failure; however, the complete power failure brings inconvenience to the life and work of people, brings power failure and production stop economic loss to power utilization enterprises, and influences the power supply performance, economic benefit and social benefit of power supply companies; in order to solve the problems, it is necessary to develop a method for replacing a secondary terminal strip of a transformer substation in a live state.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a live-line replacement method for a secondary wiring terminal strip of a transformer substation, which is safe and reliable, can be processed timely and quickly, and is simple and easy to operate.
The purpose of the invention is realized as follows: a method for replacing a secondary wiring terminal strip of a transformer substation in an electrified manner comprises the following steps:
firstly, carrying out correct bypass drainage on two ends of a terminal block by adopting a bypass drainage tool;
after bypass drainage is completed correctly, firstly clamping the wire on one side of the terminal block by using an insulating wire clamping tool, and then loosening a fastening screw of the wire on a wiring hole of the terminal block by using an insulating screwdriver so as to loosen a metal head of the wire;
taking out the metal head of the wire from the wiring hole of the terminal row by clamping of an insulating wire clamping tool, and sleeving an insulating rubber cap on the metal head of the wire by clamping of insulating tweezers;
step four, repeating the step two and the step three, and dismantling the lead on the other side of the terminal block;
clamping the terminal strip by using an insulating clamp, taking the terminal strip off the guide rail, clamping a new terminal strip by using the insulating clamp, and clamping and fixing the new terminal strip on the guide rail;
step six, clamping the removed wire by using an insulating wire clamping tool, then taking off an insulating rubber cap on the metal head of the wire by using insulating tweezers, then sending the metal head of the wire into a wiring hole of a new terminal row, and fastening the wire by using an insulating screwdriver;
step seven, repeating the step six, and fastening the other detached lead in the wiring hole on the other side of the new terminal row;
step eight, measuring whether the through-flow of the new terminal row is normal by adopting a current gear of a universal meter, and if the through-flow is abnormal, checking whether the insertion depth of a lead in a wiring hole of the new terminal row and the fastening of a fastening screw are in place; if the through current is normal, the work of replacing the terminal strip in a charged mode is finished;
and step nine, removing the bypass drainage tool, recovering the insulation encapsulation of the wires on the two sides of the new terminal block by adopting an insulation tape, and continuing the live replacement work of the next terminal block.
Still include soft arc light protection cover, wear to establish the hole on the soft arc light protection cover of preventing.
Preferably, the bypass drainage tool comprises an external insulation type crocodile mouth type wire clamp, soft insulation copper wires and an ammeter, wherein two sides of the ammeter are electrically connected with the two external insulation type crocodile mouth type wire clamps through the two soft insulation copper wires respectively; when bypass drainage is carried out, the two external insulation type crocodile mouth type wire clamps are clamped on the insulation sheaths of the wires on the two sides of the terminal block respectively, the clamping teeth of the external insulation type crocodile mouth type wire clamps can penetrate through the insulation sheaths and be electrically connected with the wires, if the ammeter shows that the current is 1A or above, the connection is correct and reliable, the bypass drainage is successful, and if not, the connection is carried out again until the bypass drainage is successful.
Further preferably, the clamping teeth of the external insulation type crocodile mouth type wire clamp are of a needle point type structure, and a pressure spring A is connected between the outer ends of two operating handles of the external insulation type crocodile mouth type wire clamp.
Preferably, the insulating wire clamping tool comprises a sleeve, a T-shaped piston rod and a T-shaped limiting rod, wherein the sleeve is made of insulating materials, two symmetrical and perpendicular outward handles are arranged on two sides of one end of the sleeve, a notch used for clamping wires on two sides of a terminal strip is formed in the other end of the sleeve, the T-shaped piston rod is sleeved on one end, located on the handle, of the sleeve, one end, close to the notch, of the T-shaped piston rod can extend into the notch, and the T-shaped limiting rod which is perpendicular to and penetrates through the notch is sleeved on one end, located on the notch, of the sleeve; and the leads on the two sides of the terminal strip are sleeved into the notches in parallel and then can be limited and clamped on the sleeve by the T-shaped limiting rod and the T-shaped piston rod, so that the work of clamping the leads on the two sides of the terminal strip by the insulating wire clamping tool is completed.
Preferably, an inward-concave arc-shaped anti-slip structure A is arranged at one end, close to the notch, of the T-shaped piston rod, and an inward-concave arc-shaped anti-slip structure B is arranged at the position, on the T-shaped limiting rod, of the wire on the two sides of the contact terminal row.
Further preferably, the handle is provided with an inward-concave arc-shaped anti-slip structure C on the side surface in the same direction as the notch, and the outer end surface of the T-shaped piston rod is provided with an inward-concave arc-shaped anti-slip structure D.
Further preferably, the end part of the sleeving end of the T-shaped limiting rod is of a smooth spherical structure, and the end part of the operating end of the T-shaped limiting rod is of a rough anti-skid structure.
Preferably, the insulation clamp comprises a substantially U-shaped bayonet A and a substantially U-shaped bayonet B, one ends of the U-shaped bayonet A and the U-shaped bayonet B are hinged together, the U-shaped bayonet A and the U-shaped bayonet B are arranged in a face-to-face manner and then enclose an openable and closable annular structure around a hinged position, the outer ends of the U-shaped bayonet A and the U-shaped bayonet B at the hinged position are respectively and integrally provided with an operating rod A and an operating rod B which are arranged at a certain angle, and a torsion spring at the hinged position is arranged between the operating rod A and the operating rod B; the annular structure can be opened and closed by the mutual approaching and departing of the operating rod A and the operating rod B around the hinged joint, so that the terminal strip can be taken and placed by the insulating clamp.
Further preferably, the outer ends of the U-shaped bayonet A and the U-shaped bayonet B, which are far away from the hinged part, are arranged into inward-arranged olecranon structures.
Further preferably, a pressure spring B is connected between the operating rod a and the outer end of the operating rod B.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
(1) The invention adopts the bypass drainage method, can change the defective terminal strip in a live way in the normal operation process of the equipment without power failure, can quickly process potential safety hazard in time while ensuring safety and reliability, brings great benefits to the normal and smooth operation of a transformer substation, brings great convenience to the life and work of people, and brings economic benefits and social benefits to power utilization enterprises and power supply companies;
(2) According to the invention, the bypass drainage tool, the insulation wire clamping tool, the insulation clamp, the insulation tweezers and the insulation screwdriver are adopted, when in operation, the bypass drainage tool clamps the wires on two sides of the terminal row to temporarily replace a corresponding conductive loop, so that the work of replacing the terminal row can be carried out without power failure, and the external insulation structures of the insulation wire clamping tool, the insulation clamp, the insulation tweezers and the insulation screwdriver can prevent mistaken touch of a metal box body of equipment and mistaken electric shock, so that safety is ensured and meanwhile, an operator is assisted to quickly complete replacement work;
generally, the method has the advantages of safety, reliability, timely and quick treatment, and simple and easy operation.
Drawings
Fig. 1 is a schematic view of the overall composition of the bypass drainage tool of the present invention.
Fig. 2 is a schematic cross-sectional view of the insulated wire clamping tool of the present invention.
FIG. 3 is a schematic view of the insulation clamping tool of the present invention in a partial cross-sectional view when the wire is inserted into the notch in parallel.
FIG. 4 is a schematic view of a partial cross-sectional structure of the insulated wire clamping tool of the present invention when the wire is sleeved into the notch in parallel and clamped by the T-shaped piston rod and the T-shaped limiting rod.
Fig. 5 is a schematic view of the structure of the insulating clamp of the present invention.
FIG. 6 is a schematic view showing the structure of the soft arc-protecting cover of the present invention.
In the figure: 10. the device comprises a bypass drainage tool 101, an outer insulation type crocodile mouth type wire clamp 102, a soft insulation copper wire 103, an ammeter 104, a pressure spring A20, an insulation wire clamping tool 201, a sleeve 202, an arc anti-skidding structure C203, a handle 204, a T-shaped piston rod 205, an arc anti-skidding structure D206, an arc anti-skidding mechanism A207, a rough anti-skidding structure 208, a notch 209, an arc anti-skidding structure B2010, a T-shaped limiting rod 2011, a smooth spherical structure 2012, a limiting channel 2013, a limiting step A2014, a limiting step B30, an insulation clamp 301, a U-shaped bayonet A302, a olecranon structure 303, a U-shaped bayonet B304, an operating rod A305, a pressure spring B306, an operating rod B307, a torsion spring 308, an annular structure 40, a soft arc light-proof protective cover 401, a through hole 50 and a wire.
Detailed Description
It should be understood that under the conditions that the quality performance of the terminal strip is intact and flawless, the incoming line, the outgoing line and the test pressing plate are reliably connected, and the contact is good, the temperature of each connection point is normal and stable, and generally the temperature is about 30 ℃ when a thermodetector is used for field practical measurement, and the temperature does not rise.
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
As shown in fig. 1, 2, 3, 4, 5 and 6, the invention provides a method for replacing a secondary terminal strip of a transformer substation with a live wire, which comprises the following steps:
firstly, a bypass drainage tool 10 is adopted to carry out correct bypass drainage on two ends of a terminal block;
after bypass drainage is completed correctly, firstly clamping the wire 50 on one side of the terminal row by using the insulated wire clamping tool 20, and then loosening the fastening screw of the wire 50 on the wiring hole of the terminal row by using an insulated screwdriver, so that the metal head of the wire 50 is loosened, the metal head can be taken out easily, and the fastening screw does not need to be screwed out completely; specifically, the insulated screwdriver is a full-insulated plastic-handle screwdriver, and the screwdriver head of the insulated screwdriver is a non-magnetic material, so that arcing or arc scratching of a terminal strip can be prevented when a point made of a metal material contacts a charged body;
taking out the metal head of the lead 50 from the wiring hole of the terminal row by clamping the insulated wire clamping tool 20, and then sleeving an insulated rubber cap on the metal head of the lead 50 by clamping insulating tweezers; specifically, the insulating rubber cap plays a role of an insulating metal head, and prevents the insulating rubber cap from contacting with metal objects of the surrounding environment to cause short circuit, grounding or arcing to hurt people;
step four, repeating the step two and the step three, and dismantling the lead 50 on the other side of the terminal block;
step five, clamping the terminal strip by using the insulating clamp 30, taking the terminal strip off the guide rail, clamping a new terminal strip by using the insulating clamp 30, and clamping the new terminal strip on the guide rail;
step six, clamping the dismantled wire 50 by using an insulating wire clamping tool 20, then taking off an insulating rubber cap on the metal head of the wire 50 by using insulating tweezers, then sending the metal head of the wire 50 into a wiring hole of a new terminal row, fastening the wire 50 by using an insulating screwdriver, slightly pulling out the wire 50 after tightening a fastening screw, and reliably fixing the metal head if the wire 50 is not pulled out;
step seven, repeating the step six, and fastening the other detached lead 50 in the wiring hole on the other side of the new terminal strip;
step eight, measuring whether the through-flow of the new terminal row is normal or not by adopting a current gear of a universal meter, and if the through-flow is abnormal, checking whether the insertion depth of the lead 11 in the wiring hole of the new terminal row and the fastening of a fastening screw are in place or not; if the through current is normal, the work of replacing the terminal strip in a charged state is finished; specifically, a thermodetector can be used for measuring the temperature of the wiring point of the new terminal block, and the temperature is displayed normally, namely the through-flow is normal;
and step nine, removing the bypass drainage tool 10, recovering the insulation encapsulation of the wires 50 on two sides of the new terminal block by using an insulation tape, specifically, removing the outer insulation type crocodile mouth type wire clamp 101 on one side, winding and encapsulating the clamped outer insulation part on the wires 50 by using the insulation tape, recovering the insulation reliability, displaying the current of 0 by using the ammeter 103, removing the outer insulation type crocodile mouth type wire clamp 101 on the other side by using the same method, recovering the outer insulation of the wires 50, and continuing the live replacement work of the next terminal block.
The arc light protection cover is characterized by further comprising a soft arc light protection cover 40, and a through hole 401 is formed in the soft arc light protection cover. Specifically, the soft arc light protection cover 40 is used to shield the electric part of the working surface and prevent the arc light from damaging the operator and the adjacent circuit due to improper operation; the through hole 401 is used for penetrating of an insulating screwdriver, and the operation of fastening screws is conveniently implemented.
Preferably, the bypass drainage tool 10 comprises an external insulation type crocodile mouth-shaped wire clamp 101, a soft insulation copper wire 102 and an ammeter 103, wherein two sides of the ammeter 103 are respectively and electrically connected with the two external insulation type crocodile mouth-shaped wire clamps 101 through the two soft insulation copper wires 102; specifically, the upper and lower double-blade type gripping teeth of the external insulation type crocodile mouth type wire clip 101 can pierce through the insulation sheath of the wire 50 and automatically connect the conductive loop thereof, so that the conductive loop is bypassed to the bypass drainage tool 10, the secondary current loop is kept smooth, namely, the secondary loop does not run in an open circuit, and the terminal block is replaced in an electrified manner.
When bypass drainage is carried out, the two external insulation type crocodile mouth type wire clamps 101 are clamped on the insulating sheaths of the wires 50 on the two sides of the terminal strip respectively, the clamping teeth of the external insulation type crocodile mouth type wire clamps 101 can penetrate through the insulating sheaths to be electrically connected with the wires 50, if the ammeter 103 displays that the current is 1A or more, the connection is correct and reliable, the bypass drainage is successful, and otherwise, the connection is carried out again until the bypass drainage is successful.
Further preferably, the clamping teeth of the external insulation type crocodile mouth type wire clamp 101 are in a needle point type structure, the needle points of the external insulation type crocodile mouth type wire clamp can penetrate through an insulation outer skin to be in contact with a conductor, and then the external insulation type crocodile mouth type wire clamp is matched with up-down bidirectional clamping, so that the connection reliability and the bearing capacity of a contact surface are effectively guaranteed.
Further preferably, a pressure spring a104 is connected between the outer ends of the two operating handles of the external insulation type crocodile mouth type wire clamp 101, and the two ends of the pressure spring a104 generate an external elastic force effect, so that the two operating handles of the external insulation type crocodile mouth type wire clamp 101 can be assisted to clamp the teeth of the wire 50 better.
Preferably, the insulating wire clamping tool 20 includes the sleeve 201 that insulating material made, T shape piston rod 204 and T shape gag lever post 2010, the one end both sides of sleeve 201 are equipped with two symmetries and perpendicular outside handles 203, the breach 208 that is used for terminal strip both sides wire 50 card to establish is seted up to the other end of sleeve 201, the pot head that lies in handle 203 on the sleeve 201 is equipped with in T shape piston rod 204 and the one end that T shape piston rod 204 is close to breach 208 can stretch into breach 208, the pot head that lies in breach 208 on the sleeve 201 is equipped with perpendicularly and passes the T shape gag lever post 2010 that breach 208 set up.
The wires 50 on both sides of the terminal strip are sleeved in the notch 208 in parallel and then can be limited by the T-shaped limiting rod 2010 and the T-shaped piston rod 204 and clamped on the sleeve 201, so that the clamping and holding work of the insulating wire clamping tool 20 on the wires 50 on both sides of the terminal strip is completed.
Further preferably, an inwardly concave arc-shaped anti-slip structure a206 is arranged at one end of the T-shaped piston rod 204 close to the notch 208, and an inwardly concave arc-shaped anti-slip structure B209 is arranged at a position on the T-shaped limiting rod 2010, which is in contact with the wires 50 on both sides of the terminal block. Specifically, the arc-shaped anti-slip structure B209 and the arc-shaped anti-slip structure a206 can clamp the wire 50 from above and below the guide 50 more tightly, respectively, thereby better completing the clamping and holding work of the insulated wire clamping tool 20 on the wire 50.
Further preferably, the handle 203 is provided with an inwardly concave arc-shaped anti-slip structure C202 on the side surface in the same direction as the notch 208, and the outer end surface of the T-shaped piston rod 204 is provided with an inwardly concave arc-shaped anti-slip structure D205. Specifically, the arc-shaped anti-slip structures C202 and D205 are used to facilitate better gripping and handling of the insulated wire gripping tool 20 by the operator.
Preferably, the end of the sleeving end of the T-shaped limiting rod 2010 is of a smooth spherical structure 2011, so that the T-shaped limiting rod 2010 can be smoothly sleeved in the sleeving process; the end part of the operation end of the T-shaped limiting rod 2010 is provided with a rough anti-slip structure 207, and the rough anti-slip structure 207 has large friction force, so that an operator can operate the T-shaped limiting rod 2010.
Further preferably, the T-shaped limiting rod 2010 is sleeved on the sleeve 201 through a limiting channel 2012 and located at one end of the notch 208, a limiting step B2014 is arranged at one end, close to the rough anti-slip structure 207, in the limiting channel 2012, a limiting step a2013 matched with the limiting step B2014 is arranged at one end, close to the smooth spherical structure 2011, on the T-shaped limiting rod 2010, the T-shaped limiting rod 2010 can be limited in the limiting channel 2012 by blocking the limiting step a2013 through the limiting step B2014, and due to the arrangement, the T-shaped limiting rod 2010 cannot slide out of the limiting channel 2012 in the sleeving process, and accidental loss is prevented.
Preferably, the insulation clamp 30 comprises a generally U-shaped bayonet A301 and a generally U-shaped bayonet B303, one end of each of the U-shaped bayonet A301 and the U-shaped bayonet B303 is hinged together, the U-shaped bayonet A301 and the U-shaped bayonet B303 are arranged in a face-to-face manner and then enclose a ring-shaped structure 308 which can be opened and closed around a hinge joint, the outer ends of the U-shaped bayonet A301 and the U-shaped bayonet B303 at the hinge joint are respectively and integrally provided with an operating rod A304 and an operating rod B306 which are arranged at a certain angle, and a torsion spring 307 at the hinge joint is arranged between the operating rod A304 and the operating rod B306; specifically, the torsion spring 307 is arranged to automatically move the operating rod a304 and the operating rod B306 away from each other, so as to maintain the annular structure 307 surrounded by the U-shaped bayonets a301 and B303.
The ring structure 308 can be opened and closed by moving the operating rod a304 and the operating rod B306 toward and away from each other around the hinge, thereby completing the access of the terminal rows by the insulating clamp 30. Specifically, the openable and closable loop structure 308 is used to grasp and release the terminal block.
It is further preferred that the outer ends of U-shaped bayonet a301 and U-shaped bayonet B303 away from the hinge are provided with an inwardly disposed substantially eagle beak structure 302, which facilitates the firm clamping of the terminal strip during the gripping and releasing process.
Preferably, a pressure spring B305 is connected between the outer ends of the operating rod a304 and the operating rod B306, and two ends of the pressure spring B305 generate an outward elastic force to assist the torsion spring 307, so that the annular structure 308 formed by the operating rod a304 and the operating rod B306 is closed more tightly, and accidents are prevented.
When the invention is actually implemented, the bypass drainage tool 10, the insulating wire clamping tool 20, the insulating clamp 30, the soft arc light-proof protective cover 40, the insulating screwdriver and the outer insulating layer of the insulating tweezers are firstly checked to be free from damage or cracking, and meanwhile, the working performance of each tool is checked to be good; then, two external insulation type crocodile mouth-shaped wire clamps 101 of the bypass drainage tool 10 are respectively clamped on the wires on two sides of the terminal strip needing to be replaced, the electrical connection of clamping points is ensured to be good and reliable, and bypass drainage is completed correctly; then, the T-shaped limiting rod 2010 of the insulating wire clamping tool 20 is pulled out until the notch 208 is completely exposed, then the insulating wire clamping tool 20 is moved, the lead 50 on one side of the terminal row is sleeved into the notch 208 in parallel, after the T-shaped limiting rod 2010 is reset, the T-shaped limiting piston rod 204 is pressed tightly, the lead 50 is clamped between the arc-shaped anti-skidding structure A206 and the arc-shaped anti-skidding structure B209, the fastening screw of the lead 50 in the wiring hole of the terminal row is loosened by using an insulating screwdriver, the metal head of the lead 50 is pulled out by slowly moving the insulating wire clamping tool 20 after loosening, the lead is far away from the terminal row, the metal object is prevented from being touched by mistake in the pulling-out process, then the insulating rubber cap is clamped on the metal head by using insulating tweezers, then the lead 50 on the other side of the terminal row is detached by using the same method, and at the moment, the insulating wire clamping tool 20 can be left on the lead 50 for convenient subsequent use; then, the insulating clamp 30 is used for gripping an operating rod A304 and an operating rod B306 of the insulating clamp 30, opening the U-shaped bayonet A301 and the U-shaped bayonet B303, enabling the U-shaped bayonet A301 and the U-shaped bayonet B303 to just clamp two sides of a terminal row respectively, releasing and still holding the operating rod A304 and the operating rod B306, enabling the terminal row to be clamped in the annular structure 308 under the combined action of a torsion spring 307 and a pressure spring B305, operating the guide rail to enable the guide rail to loosen the terminal row, moving the insulating clamp 30 to a terminal row recovery position, operating the insulating clamp 30 to release the terminal row to the terminal row recovery position, operating the insulating clamp 30 to clamp a new terminal row, moving the insulating clamp 30 to the guide rail to enable the new terminal row to be clamped on the guide rail, operating the guide rail to enable the guide rail to clamp the new terminal row, and operating the insulating clamp 30 to release the new terminal row; then, the insulating wire clamping tool 20 clamped on the wire 50 is taken up, an insulating rubber cap on the metal head of the wire 50 is removed by using insulating tweezers, the insulating wire clamping tool 20 is moved slowly, the metal head of the wire 50 clamped by the insulating wire clamping tool 20 is sent into a wiring hole on the corresponding side of a new terminal row, a fastening screw in the wiring hole is screwed by using an insulating screwdriver until the metal head of the wire 50 is clamped by the fastening screw, the wire 50 is slightly pulled out by the insulating wire clamping tool 20 and can be pulled out without moving, the T-shaped limiting rod 2010 is pulled outwards until the T-shaped limiting rod 2010 does not block the wire 50 any more, and the insulating wire clamping tool 20 is moved slowly until the wire 50 is moved out of the notch 208; then operating the insulated wire clamping tool 20 to clamp the wire 50 at the other side of the new terminal strip and send the wire into the wiring hole at the corresponding side of the new terminal strip, then screwing the fastening screw in the wiring hole until the metal head of the wire 50 is tightly clamped in the wiring hole, and then operating the insulated wire clamping tool 20 to release the wire 50, so that the live-wire replacement work of the terminal strip is basically finished; then measuring the working temperature of two connection points on the new terminal row by using a temperature measuring instrument, if the displayed temperature is normal, the connection is reliable, the through flow of the new terminal row is normal, and if the displayed temperature is different, repeatedly checking whether the connection points are in good contact and correcting until the temperature is normal; the bypass drain tool 10 is then removed and the insulation envelope of the wire is restored until the live replacement of the terminal strip is completed.
It should be noted that, although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can make modifications and equivalents to the specific embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and equivalents are intended to be included in the scope of the claims.
Claims (9)
1. A transformer substation secondary wiring terminal row electrification replacing method is characterized by comprising the following steps:
firstly, carrying out correct bypass drainage on two ends of a terminal block by adopting a bypass drainage tool;
after bypass drainage is completed correctly, firstly clamping the wire on one side of the terminal block by using an insulating wire clamping tool, and then loosening a fastening screw of the wire on a wiring hole of the terminal block by using an insulating screwdriver so as to loosen a metal head of the wire;
taking out the metal head of the lead from the wiring hole of the terminal row by clamping of an insulating wire clamping tool, and then sleeving an insulating rubber cap on the metal head of the lead by clamping of insulating tweezers;
step four, repeating the step two and the step three, and dismantling the lead on the other side of the terminal block;
clamping the terminal strip by using an insulating clamp, taking the terminal strip off the guide rail, clamping a new terminal strip by using the insulating clamp, and clamping and fixing the new terminal strip on the guide rail;
step six, clamping the removed wire by using an insulating wire clamping tool, then taking off an insulating rubber cap on the metal head of the wire by using insulating tweezers, then sending the metal head of the wire into a wiring hole of a new terminal row, and fastening the wire by using an insulating screwdriver;
step seven, repeating the step six, and fastening the other detached lead in the wiring hole on the other side of the new terminal row;
step eight, measuring whether the through-flow of the new terminal row is normal or not by adopting a current gear of a universal meter, and if the through-flow is abnormal, checking whether the insertion depth of a lead in a wiring hole of the new terminal row and the fastening of a fastening screw are in place or not; if the through current is normal, the work of replacing the terminal strip in a charged state is finished;
step nine, removing the bypass drainage tool, recovering the insulation encapsulation of the wires on the two sides of the new terminal block by using an insulation tape, and continuing the live replacement work of the next terminal block;
the bypass drainage tool comprises an external insulation type crocodile mouth-shaped wire clamp, soft insulation copper wires and an ammeter, wherein two sides of the ammeter are electrically connected with the two external insulation type crocodile mouth-shaped wire clamps through the two soft insulation copper wires respectively; when bypass drainage is carried out, the two external insulation type crocodile mouth type wire clamps are clamped on the insulation sheaths of the wires on the two sides of the terminal block respectively, the clamping teeth of the external insulation type crocodile mouth type wire clamps can penetrate through the insulation sheaths and be electrically connected with the wires, if the ammeter shows that the current is 1A or above, the connection is correct and reliable, the bypass drainage is successful, and if not, the connection is carried out again until the bypass drainage is successful.
2. The live replacement method for the substation secondary terminal block according to claim 1, characterized in that: the clamp tooth of external insulation formula crocodile mouth type fastener is needle point formula structure, be connected with pressure spring A between two operating handle outer ends of external insulation formula crocodile mouth type fastener.
3. The live replacement method for the substation secondary terminal block according to claim 1, characterized in that: the insulating wire clamping tool comprises a sleeve, a T-shaped piston rod and a T-shaped limiting rod, wherein the sleeve is made of insulating materials, two symmetrical and perpendicular outward handles are arranged on two sides of one end of the sleeve, a notch used for clamping wires on two sides of a terminal strip is formed in the other end of the sleeve, the T-shaped piston rod is sleeved on one end, located on the handle, of the sleeve, one end, close to the notch, of the T-shaped piston rod can extend into the notch, and the T-shaped limiting rod which is perpendicular to and penetrates through the notch is sleeved on one end, located on the notch, of the sleeve; and the leads on the two sides of the terminal row are sleeved into the notch in parallel and then can be limited by the T-shaped limiting rod and the T-shaped piston rod and clamped on the sleeve, so that the work of clamping the leads on the two sides of the terminal row by the insulating wire clamping tool is completed.
4. The live replacement method for the substation secondary terminal block according to claim 3, characterized in that: one end of the T-shaped piston rod, which is close to the notch, is provided with an inward-concave arc-shaped anti-skidding structure A, and the positions of the T-shaped limiting rod, which are in contact with the leads on the two sides of the terminal row, are provided with inward-concave arc-shaped anti-skidding structures B.
5. The live replacement method for the substation secondary terminal block according to claim 3, characterized in that: the handle is located the side of breach equidirectional is equipped with inside sunken arc anti-skidding structure C, the outer terminal surface of T shape piston rod is equipped with inside sunken arc anti-skidding structure D.
6. The live replacement method for the substation secondary terminal block according to claim 3, characterized in that: the end part of the sleeving end of the T-shaped limiting rod is of a smooth spherical structure, and the end part of the operating end of the T-shaped limiting rod is of a rough anti-skidding structure.
7. The live replacement method for the substation secondary terminal block according to claim 1, characterized in that: the insulation clamp comprises a general U-shaped bayonet A and a U-shaped bayonet B, one end of the general U-shaped bayonet A and one end of the general U-shaped bayonet B are hinged together, the U-shaped bayonet A and the U-shaped bayonet B are arranged face to face and then are enclosed into an annular structure which can be opened and closed around a hinged part, the outer ends of the U-shaped bayonet A and the U-shaped bayonet B at the hinged part are respectively and integrally provided with an operating rod A and an operating rod B which are arranged at a certain angle, and a torsion spring at the hinged part is arranged between the operating rod A and the operating rod B; the annular structure can be opened and closed by the mutual approaching and departing of the operating rod A and the operating rod B around the hinged joint, so that the terminal strip can be taken and placed by the insulating clamp.
8. The live replacement method for the substation secondary terminal block according to claim 7, characterized in that: the U-shaped bayonet A with the outer end of keeping away from articulated department on the U-shaped bayonet B sets up the olecranon structure for setting up inwards.
9. The live replacement method for the substation secondary terminal block according to claim 7, characterized in that: and a pressure spring B is connected between the outer ends of the operating rod A and the operating rod B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111135040.3A CN113746037B (en) | 2021-09-27 | 2021-09-27 | Substation secondary wiring terminal row live-line replacement method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111135040.3A CN113746037B (en) | 2021-09-27 | 2021-09-27 | Substation secondary wiring terminal row live-line replacement method |
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| Publication Number | Publication Date |
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| CN113746037A CN113746037A (en) | 2021-12-03 |
| CN113746037B true CN113746037B (en) | 2022-10-18 |
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| Application Number | Title | Priority Date | Filing Date |
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|---|---|
| CN113746037A (en) | 2021-12-03 |
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