Field of use
Insulator chains are used to equip overhead power lines and transformer stations from 20 kV to 400 kV

Description
When preparing the component of the insulator chains, the voltage of the electrical installation, the pollution area, the type of chain, the coupling method, etc. were taken into account.

The electrical behavior of the insulator chains was verified by tests carried out in accordance with the provisions of SR CEI 1109 and the specification Transelectrica DRT ST-33-2001 in the laboratories of ICMET Craiova, Polytechnic University EGU HV Laboratory Prague, Czech Republic.

The clamps and armatures that are part of the insulator chains are designed and executed by the specialists of SC Electromontaj SA - Campina clamps and fittings factory.
The mechanical and electrical testing of clamps and armatures was done in the own laboratories or of the specialized institutes of ICEMENERG, ICPE and the Bucharest Polytechnic University. The products correspond to the provisions of SR EN 61284 and BS 3288 p1.

Nominal tension at 20 kV
Thus, for the 20 kV LEA, single and double support and extension chains for one conductor per phase are presented.
At this voltage, V-shaped support chains are also presented, used in the case of using CIE type consoles.

Nominal tension at 110 kV
For electrical installations with nominal voltage of 110 kV, single and double support chains for one conductor are presented. Traction chains for this tension are of single, double or triple type. For use in electrical substations, V-shaped traction chains are also presented, with or without adjustment of the two branches.

Nominal tension 200 and 400 kV
For LEA and 220 and 400 kV transformer stations, simple and double support chains are presented, for one or two conductors per phase. When stretching, single, double or triple chains can be used. For the transformer stations, V-shaped extension chains for one or more conductors, with or without branch adjustment, are also presented.

Symbolization of composite insulator chains

Full specific symbology – Example:

1 Double support chain
2 The number of conductors per phase
3 Composite insulator with tension and support function in power stations and LEA
4 Nominal tension (kV)
5 Pollution area
6 Constructive variant of insulator (as applicable)
7 Mechanical Load Specified for traction
6 Type of end assembly (Ball-Socket)

Symbolization of the pollution zone

The data is according to SR CEI 815:1993

Clamps and fittings that are part of the insulator chains are designed and executed by specialists of SC Electromontaj SA - Campina Clamps and fittings Factory.
Mechanical and electrical tests on clamps and reinforcements was done in the own laboratories or of the specialized institutes of ICEMENERG, ICPE and the Bucharest Polytechnic University. The products correspond to the provisions of SR EN 61284 and BS 3288 p1.

When making insulator chains for voltages of 20, 110, 220 and 400 kV, the most common types of end fittings of composite insulators were used: TT si BS (tongue tongue, ball socket), but at the request of the beneficiary, the chains can be composed so that other types of combinations of reinforcements in the chain are used:

Insulator chains for 20 kV are not provided with protective armatures.
The chains for 110 kV have protection horns against overvoltages, and the chains intended for 220 and 400 kV installations have protective rings.

Protective horns
The protective horn system (C1, C2, C3) consists of horn I and II assembly. The protective horns are mounted on the ends of the insulator or the suspension armatures. The horns are made of steel and are protected against corrosion by galvanizing.

Protection rings
The system of protection rings (IPI, IPS) consists of an upper and a lower protection ring. The rings are made of aluminum or galvanized steel and are mounted on the chain armatures, respecting the bursting distance provided in the characteristics of the composite insulators.