Electrical Cross Arm Insulator

Electrical Cross Arm Insulator:

Introduction of the electrical cross arm:

The cross-arm composite insulator is made of special steel. The end of the insulator adopts the labyrinth design principle, multi-layer protection and good sealing performance, which solves the key problem of insulator interface electrical breakdown.

Advanced high temperature injection technology is adopted for the bonding between the rod and the rubber, and the automatic acoustic emission flaw detection system is equipped to ensure the reliability and stability of the connection between the rod and fittings. The ECR high temperature and acid-resistant rod is coated with special coupling agent which make the bonding performance to an excellent level.

The electrical performance of an composite insulator is characterized by the discharge voltage along the air surrounding the insulator, which bridges the two electrodes-this is known as the flashover voltage. Electrical Insulators in operation must reliably withstand both normal operating voltage and overvoltages of certain amplitudes. Silicone Rubber Insulators leaving the factory must be capable of withstanding the specified test voltage without flashover. Depending on the operating conditions, the flashover voltages are classified as follows:

Dry flashover voltage refers to the flashover voltage of power insulators in a clean and dry state. This is the primary performance metric for indoor composite insulators and is generally divided into two types: dry industrial flashover voltage and dry lightning impact flashover voltage.

Wet flashover voltage refers to the flashover voltage of clean polymer insulators subjected to artificial rain. This is the primary performance metric for outdoor polymeric insulators and is further categorized into wet power-frequency flashover voltage, wet operational impact flashover voltage, and DC wet lightning voltage for DC electrical insulators.

In the GB 775.2-1987 insulator test method, it is specified that the volume resistivity of artificial rainwater should be 100 Ω·m ± 15 Ω·m at 20°C. The raindrops sprayed should be fine and uniform, and the rainfall direction should be approximately at a 45° angle to the horizontal plane. The horizontal and vertical components of rainfall should range between 1.0 mm/min and 1.5 mm/min.

Pollution flashover voltage refers to the flashover voltage of an insulator under a certain degree of surface contamination when exposed to moisture. This typically refers to the power-frequency pollution lightning voltage for AC insulators and the DC pollution lightning voltage for DC insulators.

Mechanical properties

The mechanical properties of insulators can be divided into the following types according to the form of external force they withstand during operation:

Tensile load, for example, the insulator of a suspended transmission line conductor is affected by the gravity of the conductor and the tension of the conductor, causing a tensile load. The tensile load is expressed as the axial tensile force (unit: kN) acting on both ends of the insulator.

Bending load, for example, the pillar insulator is affected by wire tension, wind force and short-circuit current electrodynamic force. The direction of the force is perpendicular to the axis of the insulator, resulting in bending load. Bending load is expressed as the vertical force (in kN) acting on the top of the insulator.

Torsional loads, such as the supporting insulators of disconnectors, are subject to torsional moments during switching operation. Torsional load is expressed as the torque (unit: kN·m) acting on the top of the insulator.

Hot Tags: Electrical Cross Arm Insulator, China, manufacturers, suppliers, factory, wholesale, for sale, 15kV Composite Post Insulators, Composite Vertical line post insulator, 132kv Post Insulator, Vertical Post Insulators, post top insulators, Composite Braced Post Insulator