CN110247324A - The critical fever electrical treatment device of wire clamp - Google Patents

Abstract

The invention relates to an emergency heating heating treatment device for wire clips. It is characterized in that it includes a connecting screw (3), on which an upper clamp (2) and a lower clamp (6) are respectively fixedly installed, and the upper clamp (2) and the lower clamp (6) ) are U-shaped plates and parallel to each other, and the left knife contact finger (7) is arranged in the middle of the left side of the upper chuck (2) and the lower chuck (6), and the upper chuck (2) and the middle of the right side of the lower clamp (6) is provided with a right knife contact finger, and the upper and lower ends of the left knife contact finger (7) are respectively connected to the upper clamp (2) and the lower clamp ( 6) connection, and the upper end and the lower end of the right knife switch contact finger are also respectively connected with the upper chuck (2) and the lower chuck (6) through elastic elements; also include L-shaped mounting screw (4). The device can be used to deal with the heating condition of the wire clamp of the live equipment, avoid switching operation and reduce maintenance time.

Description

Wire clip emergency heating heating treatment device

technical field

The invention relates to an emergency heating heating treatment device for wire clips.

Background technique

Heating of clamps is a common failure of substation equipment. With the increase of operating years, poor contact, corrosion, and aging of equipment are quite common, and the probability of heating failures is also increasing. If the heating fault of the clamp is not dealt with in time, it will eventually develop into a critical heating, which may cause deformation and burning of the equipment, seriously threatening the safe and stable operation of the substation. For example, most of the operation and maintenance substations under the jurisdiction of a provincial maintenance company have been in operation for more than 10 years. The corrosion and aging of the equipment are serious, and the heat failure of the wire clamps occurs from time to time. In May 2016 alone, 4 critical heating failures occurred in a 330kV substation under the jurisdiction of the company. According to the statistics of heating faults in 25 substations in the past three years, it is found that heating faults at voltage levels of 220kV and below account for more than 70%, that is, equipment at this voltage level is more likely to generate heat, which has constituted a safety hazard.

According to the conventional method, after the equipment wire clip is heated, it will be treated with power failure. Through the statistics of many critical heat treatment situations in the substations under its jurisdiction, it is found that the average time for equipment outage and power transmission is about 4 hours, and the average time for power outage treatment is 1.5 hours. The entire critical fever treatment took nearly 5.5 hours. It can be seen that the situation of heating faults of wire clips in equipment is quite serious. In order to quickly deal with heating faults and solve the problem of accident expansion caused by critical heating, it is necessary to develop a device that can realize the heating of wire clips of live processing equipment. .

Contents of the invention

The purpose of the present invention is to provide an emergency heating heating treatment device for wire clamps, which can handle the heating condition of equipment wire clamps with electricity, avoid switching operations, and reduce maintenance time.

An emergency heat treatment device for cable clips, which is special in that it includes a connecting screw on which an upper chuck and a lower chuck are fixedly installed respectively, and the upper chuck and the lower chuck are both U-shaped plates And parallel to each other, the left knife contact finger is provided in the middle of the left side of the upper chuck and the lower chuck, and the right knife contact finger is arranged in the middle of the right side of the upper chuck and the lower chuck. The upper end and the lower end of the left knife switch contact finger are respectively connected with the upper chuck and the lower chuck through elastic elements, and the upper end and lower end of the right knife switch finger are also respectively connected with the upper chuck and the lower chuck through elastic elements ; Also includes an L-shaped mounting screw, one end of the L-shaped mounting screw is fixedly connected to the aforementioned connecting screw, and the other end is detachably connected to the top of the insulating operating rod through a fastener.

The openings of the left knife switch finger and the right knife switch finger are both bent outwards in an arc shape, and the connecting section between the left knife switch finger and the right knife switch finger is a soft connection.

Among them, the soft connection refers to the connection through wires.

The front part of the upper end and the lower end of the left knife switch contact finger is connected with the upper chuck and the lower chuck through the top spring, and the rear part of the upper end and the lower end of the left knife switch contact finger is connected with the upper chuck and the lower chuck through the tension spring Head connection; the front part of the upper and lower ends of the right knife switch contact finger is connected with the upper and lower chucks through the top spring, and the rear part of the upper and lower ends of the right knife switch contact finger is connected with the upper chuck through the tension spring Connect with the lower chuck.

The device of the present invention adopts a simple shunting principle, uses external force to increase the contact surface between the clamps, reduces the contact resistance (heating caused by the loosening of clamp screws in general) and makes a part of the current passing between the two clamps flow from the shunt device Passing, thereby reducing the current directly passing through the clamp, and at the same time reducing the heating temperature of the equipment clamp. The device can be used to deal with the heating condition of the wire clamp of the live equipment, avoid switching operation and reduce maintenance time. The tail of the device is fixed by bolts, which can be applied to wire clips and wires of various thicknesses and diameters. Springs are installed between the crimping contact fingers and the external fixed steel parts to increase the pressing force of the contact fingers. It has excellent electrical performance. The finger design increases the current-carrying capacity of the shunt device.

Description of drawings

Accompanying drawing 1 is the structural representation of the present invention.

Detailed ways

As shown in Fig. 1, the present invention provides an emergency heat treatment device for wire clamps, which includes a connecting screw 3, on which an upper chuck 2 and a lower chuck 6 are respectively fixed and detachable through threads, The distance between the upper chuck 2 and the lower chuck 6 is adjustable and both are horizontal U-shaped plates, and the two horizontal U-shaped plates have the same size and shape and are parallel to each other. The middle connection of the pass through and connect.

In the middle of the left side of the upper chuck 2 and the lower chuck 6, a U-shaped plate-shaped left knife contact finger 7 is arranged, and in the middle of the right side of the upper chuck 2 and the lower chuck 6, a U-shaped contact finger is arranged. The plate-shaped right knife switch contact finger, the upper end (board outer wall) and lower end (board outer wall) of the left knife switch contact finger 7 pass through the elastic element and the upper chuck 2 (board inner wall) and the lower chuck 6 (plate inner wall) respectively. Inner wall) connection, and the upper end (board outer wall) and lower end (board outer wall) of the right knife switch contact finger are also respectively connected with the upper chuck 2 (board inner wall) and the lower chuck 6 (board inner wall) through elastic elements; It includes an L-shaped mounting screw 4. One end of the L-shaped mounting screw 4 is fixedly connected to the middle part of the aforementioned connecting screw 3, and the other end is detachably connected to the top of the 200KV insulating operating rod through a fastener such as a screw thread.

In addition, the openings of the left knife switch finger 7 and the right knife switch finger are bent outwards in an arc shape, and the connecting section between the left knife switch finger 7 and the right knife switch finger is a soft connection, The flexible connection refers to the connection through multiple copper or aluminum wires.

Wherein the front part of the upper end and the lower end of the left knife switch contact finger 7 is connected with the upper clamp 2 and the lower clamp 6 through the top spring 1, and the rear part of the upper end and the lower end of the left knife switch contact finger 7 is connected with the upper clamp 6 through the tension spring 5 The upper chuck 2 is connected with the lower chuck 6; the front part of the upper end and the lower end of the right knife switch contact finger is connected with the upper chuck 2 and the lower chuck 6 through the top spring 1, and the upper end and the lower end of the right knife switch contact finger are connected with each other. The rear portion of the lower end is connected with the upper chuck 2 and the lower chuck 6 through a tension spring 5 .

Example 1:

The implementation process of the system and method will be described in detail below in conjunction with the accompanying drawings.

1. Assembly of the device.

The components of each part are assembled according to Figure 1.

(1) Touch finger part.

The contact finger part adopts the knife contact finger as the contact part, which can effectively reduce the contact resistance between the device and the clamp. With dual touch fingers, the stability of the device can be improved. The rear part of the upper and lower contact fingers is connected with a copper soft connection. The choice of soft connection can be selected according to the current of the clamp; the contact finger and the steel plate are connected by a spring. The finger spacing is narrow at the front and wide at the rear, which can effectively increase the grip force of the device, and at the same time play a role in shock absorption and improve the stability of the device.

(2) Screw part.

The screw adopts a full-wire screw, which can be reliably connected and fixed by the nut and the steel plate, and the distance between the fingers can also be adjusted according to the thickness of the equipment; the device is fixed by a U-shaped steel plate.

(3) Clamping structure.

The clamping structure adopts double clamps, the clamping force is sufficient and the contact length is not less than 70% of the equipment width, the thickness is 3-4mm, the horizontal length is ≥10cm, the opening length is between 3-3.5cm, and the spacing is 4.5-5.5 cm, the connecting screw 3 is designed to be 4.5*45mm, and the pin adopts 10*10mm, which has higher stability, is easier to install, and has high shock resistance. The clamping material is a stainless steel plate with a compression resistance of 150-200kg/cm2. It has good electrical conductivity, stable performance, no significant change in performance under high and low temperature, and strong oxidation resistance.

(4) Connection structure.

The connection structure adopts contact connection, which is easy to install and separate, sufficient force transmission, moderate connection stability, low production cost. The screw size is 20mm*8cm, and the sleeve size is 24mm*7cm. The transmission material is made of a special 220kV operating rod, which is connected by an additional threaded buckle. After installation, the buckle will not be loosened, and the stability is high, which can meet the requirements of 5.1 meters high-altitude operation.

(5) steel plate.

The high hardness of the steel plate can play a good role in fixing. The U-shaped design of the steel plate can avoid the bolts on the clamp on the one hand, and at the same time reduce the weight of the device and reduce the difficulty of operation; The operating rod makes the device not easy to fall, and the U-shaped steel ring is added to the lower part to increase a force point to make the operation easier.

2. Device performance testing.

The performance of this device was tested as follows before use:

(1) Test of the resistance value between the fingers: the test value is <50μΩ, which meets the requirements;

(2) Withstand voltage test: the overall ground-to-ground 440kV withstand voltage test has no breakdown for 1 minute, which meets the requirements;

(3) Clamping force test: the weight of the clamping joint is 2.5kg, the effective clamping force between the single contact finger is 45N, and the double contact finger can reach 90N, which can ensure that the clamping joint will not be affected by environmental factors such as strong wind after installation fall off;

(4) Moment calculation: Taking the height of 220kV equipment as an example, the arm strength of an adult man is about 700N, the operable length of the operating rod is 0.8 meters, the weight of the clamped joint is 2.5 kg, and the weight of the operating rod is 4 kg. The tightening force is 90N. Calculated by the torque formula, the device can operate at a height of 5.1 meters. The height of 220kV equipment in the station generally does not exceed 5 meters. The safe distance for 220kV live working is 1.8 meters, which meets the requirements for working at heights of 220kV equipment.

(5) On-site live test: The maintenance personnel used the device to conduct on-site treatment for the heat generated by the clamp of a 35kV voltage transformer equipment in a substation. The first step is to use infrared precise temperature measurement to confirm the hot spot; the second step is to adjust the tail nut of the shunt joint to make the gap between the upper and lower fingers of the shunt joint meet the requirements of on-site use; the third step is to assemble the connection transfer device and connect the shunt The connector is clamped on the heating point (equipment clamp), and the installation is confirmed to be reliable; the fourth step is to continuously observe through infrared precise temperature measurement, and make a record to observe whether the temperature of the heating point has dropped.

Claims (4)

1. An emergency heat treatment device for wire clips, characterized in that: it includes a connecting screw (3), on which an upper chuck (2) and a lower chuck (6) are respectively fixedly installed, the The upper chuck (2) and the lower chuck (6) are U-shaped plates and are parallel to each other, and the left side knife contact finger ( 7), and in the middle of the right side of the upper clamp (2) and the lower clamp (6), the right knife contact finger is provided, and the upper and lower ends of the left knife switch finger (7) pass through the elastic element respectively. It is connected with the upper chuck (2) and the lower chuck (6), and the upper end and the lower end of the knife switch contact finger on the right side are also respectively connected with the upper chuck (2) and the lower chuck (6) through elastic elements; It includes an L-shaped mounting screw (4), one end of the L-shaped mounting screw (4) is fixedly connected to the aforementioned connecting screw (3), and the other end is detachably connected to the top of the insulating operating rod through a fastener. 2. The emergency heating and heating treatment device for wire clamps according to claim 1, wherein the openings of the left knife switch finger (7) and the right knife switch finger are curved outwards in an arc shape, and The connecting section in the middle of the left knife switch finger (7) and the right knife switch finger is a soft connection. 3. The emergency heat treatment device for cable clips according to claim 1, wherein the soft connection refers to the connection through wires. 4. The emergency heating and heating treatment device for wire clips according to claim 1, characterized in that: the front of the upper and lower ends of the left knife switch finger (7) passes through the top spring (1) and the upper chuck (2) It is connected with the lower chuck (6), and the rear part of the upper and lower ends of the left knife switch contact finger (7) is connected with the upper chuck (2) and the lower chuck (6) through a tension spring (5); The front part of the upper end and the lower end of the side knife switch contact finger is connected with the upper chuck (2) and the lower chuck (6) through the top spring (1), while the rear part of the upper end and lower end of the right knife switch finger is connected by a tension spring (5) is connected with upper chuck (2) and lower chuck (6).