CN204439667U - A kind of portable type current transformer testing clamp - Google Patents

Abstract

The utility model discloses a portable current transformer testing pliers, which relates to the technical field of power grid maintenance tools. It includes a test pliers head and an insulated grip rod. There is a copper wire inside the insulation grip rod. The test pliers head is electrically connected to the copper wire inside the insulation grip rod. The tail of the insulation grip rod is provided with a first terminal. The portable current transformer The total length of the detector test clamp is 2-6m. The utility model can realize wiring on the ground, does not need to work on heights, avoids safety hazards caused by operations on heights, reduces operators, saves time, and improves work efficiency.

Description

A portable current transformer test clamp

technical field

The utility model relates to the technical field of power grid maintenance tools, in particular to a portable current transformer testing clamp.

Background technique

Under the general situation of building a strong power grid in the country, the work tasks of the power system are very heavy, and there are many new and renovated substations every year. According to the requirements of the regulations, the newly installed current transformer and the current transformer in the maintenance state must be tested for the ratio of the current transformer. The principle of the test is simple, but the process of fixing the ascending flow line during the test is very cumbersome, which not only requires a lot of manpower and time, but also has certain hidden dangers of equipment damage and personal injury, which seriously affects the work efficiency and staff of this work. personal safety.

Up-current tests often require copper conductors with a large current-carrying capacity, generally with a diameter of more than 50 mm. The traditional up-current test method is that the construction personnel carry a ladder on the up-current line to the PT interval. There is only room for one person, and it is extremely inconvenient to turn around and move with a heavy copper wire on your back. Accidents such as the copper wire not touching the porcelain bushing will occur and the porcelain bushing will be smashed if you are not careful.

If the upflow line is installed externally, there are also disadvantages and risks. It can be summarized as follows: During the construction process, the upflow line is lifted and hung on the cylindrical aluminum strand or the rectangular aluminum row. Due to the need for the upflow test The weight of the ascending wire used is relatively heavy, and the resultant force formed by the weight of the insulating rod itself makes the whole device very heavy. The external copper wire is swaying under the action of wind and gravity, and it is easy to damage the porcelain bottle.

If external wires are used, only those with an insulating layer can be used. After a period of use, the insulation may age and may be damaged, resulting in a decrease in its insulation capacity. Electric shocks are very likely to occur in haze or rainy weather.

Now at least 5 to 6 people need to go to the substation to do the transformer up-current test. Since the test needs to connect the up-current test wires at both ends of the primary side of the current transformer, the terminals L1 and L2 (P1, P2) are separated from the current transformer. The ground height is generally 4 to 6 meters. When working, use a single ladder or an elevator, and a special person is required to support the ladder, pass the tools up and down, and one person goes up to connect the booster or booster line, as well as operation, recording and monitoring. personnel.

The key to the problem is to use a single ladder or lift when working, and a special person is required to support the ladder and pass the tools up and down. According to the requirements, the ladder cannot lean against the porcelain bushing of the current transformer or voltage transformer, and the porcelain bushing is smooth and has a small contact surface with the ladder. Pipe and other accidents.

Because it involves high-altitude operations, according to the State Grid Electricity Safety Work Regulations, the safety belts for high-altitude operations are not allowed to be hung low and high, and it is forbidden to hang on moving or unstable objects, such as lightning arresters, circuit breakers, isolating switches, and current mutual inductance. On supports such as transformers and voltage transformers. At the working position, the safety belt could not find a suitable place to fix it. In addition, because the ladder was too high, people felt unstable in the air. Even after using the ground wire to discharge, there were still sporadic induction of electric numbness, which caused psychological fear. sense, so it is very unsafe to work, and it is very easy to cause hidden dangers of personal safety accidents for staff.

Use conventional methods to test, take a standard 110kV substation as an example: there are 110kV and 35kV current transformers in the station, there are 36 current transformers in phase A, phase B, and phase C, and the test time for one transformer is 20 minutes. The required time is 36×20=720 minutes=12 hours.

Utility model content

The technical problem to be solved by the utility model is to provide a portable current transformer testing pliers with simple structure, convenient operation, time-saving and labor-saving. Save time and improve work efficiency.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a portable current transformer test clamp, including a test clamp head and an insulating handle, a copper wire is arranged inside the insulating handle, the test clamp head and the insulating handle The inner copper wires are electrically connected, the tail of the insulating handle is provided with a first terminal, and the total length of the portable current transformer test clamp is 2-6m.

Preferably, the test pliers head and the insulation grip rod are split structures, the insulation grip rod includes a grip rod and at least one insulation connecting rod, and the test pliers head, at least one edge connecting rod and the grip rod Both the head and the tail are detachably connected by copper male and female head threads.

Preferably, the test pliers head adopts an olecranon design, and its upper jaw is fixed on the top of the pliers rod, and the pliers rod is provided with a chute, the bottom of the pliers rod is connected with a copper wire, and the lower jaw slides with the chute It is connected, and is provided with a reset clamping spring for the lower jaw, and is set opposite to the upper jaw.

Preferably, the opposite end surfaces of the upper jaw and the lower jaw are provided with a zigzag structure, and the center is provided with an arc-shaped depression matched for clamping the wire.

Preferably, the upper jaw is provided with a second connection terminal, the lower jaw is provided with a third connection terminal, and the second connection terminal and the third connection terminal are connected by wires.

Preferably, the total length of the portable current transformer test clamp is 2.4-4.8m.

The beneficial effects produced by adopting the above-mentioned technical scheme are: the test pliers head of the utility model adopts an olecranon-style design, and the upper and lower jaws are provided with a sawtooth structure, and the lower jaws are opened and closed by the return spring at the same time, so that the pliers head The bite strength and contact area are increased, the wiring is flexible and firm, and can clamp cylindrical aluminum strands or rectangular aluminum bars; the terminals provided on the upper and lower jaws can be connected by copper wires to ensure the reliability of the wires. The copper wire is set inside the test clamp head, insulating connecting rod and insulating grip rod, avoiding accidents such as the copper wire touching the porcelain bushing and smashing the porcelain bushing, ensuring the safety of the operator and preventing the copper wire from being damaged. The aging of the insulating layer; prolonging the service life of the copper wire; because the test pliers, the insulating connecting rod and the insulating grip are detachably connected by copper male and female threads between the head and the tail, the tail of the insulating grip There is also the first connecting terminal, which is used to connect the current raising equipment, and the wiring can be realized on the ground, without the need for climbing operations, which avoids the safety hazards caused by the climbing operations, reduces the number of operators, saves time, and improves work efficiency.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model;

Among them, 1. Test clamp head, 2. Insulated connecting rod, 3. Grip rod, 4. First terminal, 5. Upper jaw, 6. Lower jaw, 7. Second terminal, 8. Third terminal, 9. Clamp head rod.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail.

As shown in Figure 1, the utility model is a portable current transformer test clamp, comprising a test clamp head 1 and an insulated handle, the inside of which is provided with a copper wire, and the test clamp head 1 and the copper wire inside the insulated handle Electrically connected, the tail of the insulating handle is provided with a first terminal 4, the total length of the portable current transformer test clamp is 2-6m; the test clamp head 1 and the insulating handle are split structures, the The insulated grip bar includes a grip bar 3 and at least one insulating connecting rod 2. The test clamp head 1, at least one edge connecting bar 2 and the grip bar 3 are all connected by copper male and female head threaded Detachable connection; the test pliers 1 adopts an olecranon design, and its upper jaw 5 is fixed on the top of the pliers rod 9, and the pliers rod 9 is provided with a chute, and the bottom of the pliers rod 9 is connected with a copper wire, and the lower The jaw 6 is slidingly connected with the chute, and is provided with a reset clamping spring of the lower jaw 6, and is set opposite to the upper jaw 5; the opposite end faces of the upper jaw 5 and the lower jaw 6 are provided with a serrated structure, and The center is provided with an arc-shaped depression for clamping the wire; the upper jaw 5 is provided with a second terminal 7, the lower jaw 6 is provided with a third terminal 8, the second terminal 7 and the second terminal The three terminals 8 are connected by wires; the total length of the portable current transformer test clamp is 2.4-4.8m.

The utility model can have multiple insulating connecting rods, the test clamp head, the insulating connecting rod and the insulating grip rod are all 1.2 meters long, and the total length of the whole device is set to 4.8 meters, which is suitable for measuring various voltages of 220KV and below. For substation use, for a 35KV transformer, you only need to use a section of insulating connecting rod, test clamp head and insulation grip to connect to measure; for a 10kV transformer, you only need to use a test clamp and insulation grip to connect , On-site adaptability, convenient and reliable connection.

In the utility model, since the test pliers head, the insulating connecting rod and the insulating grip rod are detachably connected by copper male and female head threads between the head and the tail, a 1000A copper nose is drawn at the tail of the insulating grip rod so as to be connected with us. The upflow device is reliably connected to realize the upflow experiment. The copper nose is closely connected with the device as a whole, and the conductivity is good; the direct resistance test of this device reaches 0.03 ohms, and its conductivity is particularly good, which fully meets the experimental requirements; wiring can be realized on the ground, without the need for climbing operations, avoiding the safety caused by climbing operations It reduces the risk, reduces the operating personnel, saves time and improves work efficiency. With 36 current transformers in a standard 110kV substation, the test time for one transformer can be reduced to less than 5 minutes, and the normal test time is 36×5=180 minutes=3 hours.

The test pliers head of the utility model adopts an olecranon-style design, and the upper and lower jaws are provided with a sawtooth structure, and at the same time, the lower jaws are opened and closed by the return spring, so that the occlusal strength and contact area of the pliers head are increased, and the wiring is flexible. It is firm and can hold cylindrical aluminum stranded wires or rectangular aluminum bars; the terminals provided on the upper and lower jaws can be connected by copper wires to ensure the reliability of the wires. The inside of the rod and the insulating handle avoids accidents such as the copper wire touching the porcelain bushing, causing accidents such as dumping and smashing the porcelain bushing, ensuring the safety of the operator, and also preventing the aging of the copper wire insulation layer; prolonging the use of the copper wire life; because the test pliers head, the insulating connecting rod and the insulating holding rod are detachably connected by copper male and female head threads between the two, and the tail of the insulating holding rod also has a first terminal for connecting the Streamline equipment, wiring can be realized on the ground, no need for climbing operations, avoiding the safety hazards caused by climbing operations, reducing the number of operators, saving time and improving work efficiency.

Claims (6)

1. a portable type current transformer testing clamp, it is characterized in that: comprise test binding clip (1) and insulation holding rod, insulation holding rod inside is provided with copper conductor, the copper conductor electrical connection of test binding clip (1) and insulation holding rod inside, described insulation holding rod afterbody is provided with the first connection terminal (4), and the total length of described portable type current transformer testing clamp is 2-6m.

2. a kind of portable type current transformer testing clamp according to claim 1, it is characterized in that: described test binding clip (1) and insulation holding rod are split-type structural, described insulation holding rod comprises holding rod (3) and at least one insulated connecting rod (2), and described test binding clip (1), absolutely at least one edge connecting link (2) and holding rod (3) are all removably connected by copper male and female head thread formula between head and the tail between two.

3. a kind of portable type current transformer testing clamp according to claim 1 and 2, it is characterized in that: described test binding clip (1) adopts olecranon design, its upper jaw (5) is fixed on binding clip bar (9) top, described binding clip bar (9) is provided with chute, binding clip bar (9) bottom is connected with copper conductor, lower jaw (6) is connected with slide, and is provided with lower jaw (6) reset fastening spring, and is oppositely arranged with upper jaw (5).

4. a kind of portable type current transformer testing clamp according to claim 3, is characterized in that: described upper jaw (5) and lower jaw (6) in opposite directions end face are provided with laciniation, and center is provided with the arc-shaped recess matched for wire gripper.

5. a kind of portable type current transformer testing clamp according to claim 3, it is characterized in that: described upper jaw (5) is provided with the second connection terminal (7), described lower jaw (6) is provided with the 3rd connection terminal (8), and the second connection terminal (7) is connected by wire with the 3rd connection terminal (8).

6. a kind of portable type current transformer testing clamp according to claim 1, is characterized in that: the total length of described portable type current transformer testing clamp is 2.4-4.8m.