What Is a Clip Lead?

The grounding clamp is mainly composed of a reinforced shell, a puncture blade, a gasket, a waterproof silicone grease, a high-strength bolt, a torque nut, and a cable terminal cap. When the cable needs to be branched or connected, insert the cable branch line terminal into the waterproof terminal cap. After determining the main line branch position, use a socket wrench to twist the force matrix nut on the wire clamp. The contact blade will pierce the cable insulation layer during the process In contact with the conductor, the gasket ring presses the cable around the pierced position, and the silicone grease in the housing overflows. When the torque reaches the set value, the nut torque mechanism comes off, the main and branch lines are connected, and the waterproof performance and electrical effect are achieved. The parameters required by the standard.

Maintenance personnel can easily hang the ground wire to the wires outside the porcelain string of the tension pole tower by using the ground wire of the new adjustable multi-angle ground clamp on the crossbar of the tension pole tower, and the grounding is reliable. The grounding rod does not hang down, but can rest on the tower crossbar or on the tower components. When dismantling, the maintenance staff can operate on the crossbar of the tension tower, which is convenient and safe. Utilizing the ground wire of the new adjustable multi-angle grounding clamp can make the work place centralized and reduce the number of required work shifts during maintenance. The working surface is small and the whole process control is easy. The difficulty of hanging the ground wire is reduced, and the required maintenance cost Less, which saves costs and improves the safety factor. ^[1]

(1) In order to reduce the ground resistance of the ground wire loop and improve the safety effect of the ground wire, the working site should use the ground terminal as a ground electrode as much as possible, but

Ground clamp

It is necessary to check whether the connection of the down-conductor is loose or rusted in advance, and to understand the corrosion of the underground grounding body, whether there is desoldering, and whether the grounding line is damaged, broken, or corroded.

(2) The cross-sectional area of the grounding wire cannot be uniformly based on the requirement of not less than 25 mm2. The cross-section of the grounding wire should be selected according to the maximum short-circuit current that may pass through the grounding wire. To protect workers from injury. Generally, the higher the voltage level, the longer the equipment system cuts off the power, and the larger the cross-sectional area of the ground wire required. The closer to power plants and substations, the more likely short-circuit currents are, and the larger the cross-sectional area of the ground wire is required.

(3) Because the metal body to be grounded has various styles, such as round cross-section wires, equipment lead terminals, flat metal busbars, etc., the grounding clamps also have a variety of specifications, so you should consider it beforehand and fully prepare it. Generally, it is necessary to first go to the site survey to ensure what type of ground wire tool is selected so that it corresponds to the shape of the specific connection body on the job site. Avoid unqualified connection caused by large ground circuit contact resistance due to insufficient preparation in advance.

(4) The line safety regulations stipulate that in order to prevent the human body caused by sudden incoming calls, grounding should be performed in all directions of incoming calls. Many power supply bureaus require operators to install ground wires not only on the working pole tower, but also on the front and back of the working pole tower. Grounding the base pole tower greatly increases the workload of line operators. Studies have shown that it is more practical and safe to ground the large and small sides of the working phase of the working tower only on the premise that the line ground knife has been closed. Treated as a live line.

(5) A grounding clamp operating rod with the same insulation length and voltage level must be used. The length of the grounded insulation operating rod should meet the requirements of the voltage level and safety distance of the electrical equipment in actual operation. The equipment to be operated must be a charged body and the distance specified in the electrical safety work regulations must be maintained. There should be guard rings or obvious signs at the junction of the grip part to ensure the safety of the operator.

(6) The size of the grounding resistance reflects the strength of the ground wire protection measures. The grounding resistance in order from small to large is the substation grounding network, line lightning protection grounding, and temporary grounding electrode. Under multiple grounding methods, the grounding resistance should be as small as possible. Grounding method to improve site grounding protection.

(7) Do not hang the ground wire on the wire or metal pipe of the line; its grounding resistance is unstable, the contact resistance is too large, and it does not meet the technical requirements. If a sudden call is made, the metal may be charged and the charged range may be enlarged, causing other people. Electric shock.

(8) In order to match the equipment or conductor that needs to be grounded, the staff should reasonably choose different types of grounding clamps, because the clamps are generally die-cast from thick and wide high-quality metal materials, and the short-circuit current resistance is far greater than that of the wire. The cable is strong. Usually, it is necessary to ensure the maximum contact surface between the clamp and the conductor to ensure good electrical contact of the entire ground wire; from an electrical principle, it is necessary to reduce the contact resistance of the ground circuit as much as possible. ^[2]