CRADLE

There are three basic cradle solutions to meet a variety of insulator maintenance and replacement requirements.
All are built with RITZGLAS® tubes for work on 110 to 800 kV anchor or suspension strings.

-    Single Insulator Cradles
It is generally used in 110 to 230 kV strings, supported by a pair of wire tongs or strain link stick.

-    Cradle with fittings
It is used in 345 to 500 kV strings and in combination with cradle supports to allow insulators movement.

-    Cradle with bracket (side opening) for extra high voltage
It is used in anchor strings up to 800 kV to allow single or multiple string removal. 

Single Insulator Cradles

It is used to change insulators in the string itself or to lower it to the ground. In anchor strings or angled strings, this cradle is used in conjunction with support rods. As for “I” suspensions, strain poles are used. Constructed with Ø 38 mm RITZGLAS® tubes, this series of single cradles has two steel pins at their front, which are used to support the insulator string with a pair of wire tongs or strain link stick. At the rear of the crib there are large eyes and ropes for coupling to the structure as an anchor point. In this way, the insulators can be raised or lowered to a more suitable position for replacement. When lowering the insulator string is not necessary, the cradles are mounted to the eyes located on the yokes coupled to the strain poles.

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Cradle with fittings

It is used to change insulators in strings up to 500 kV. It is also required to lower “V” or anchor insulator strings and to lift “I” suspension insulators. The deep design of the cradle is a safe way to prevent accidental fall of the insulator string. In addition, it is reinforced by the upper insulator retaining plate, which securely holds it during transport. The insulator plate has dual use: on one side fits insulators up to Ø 273 mm; and, on the opposite side, it adapts to insulators up to Ø 286 mm. The cradle can be easily lowered or lifted for insulator change through the forged steel swivel eyes at one end and the other with the aid of the steel handle (R070184) attached to a strain link stick, and it also has an auxiliary hook (R068922). The steel strap and hook are supplied with the cradle.

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Cradle Support

It is made with Ø 64 mm RITZGLAS® tube and its main structure has a heat-treated aluminum head with forged steel swivel eye and three pairs of hooks, which are coupled to a spiral link pole and act as a support.

Support Cradle

It has been developed for the selective removal of a single insulator string, particularly, in double, triple, or quadruple anchor strings. Using this cradle, it is not necessary to remove the upper strings to extract the lower strings.

Constructed with Ø 64 mm RITZGLAS® tube as its main element, it has three Ø 38 mm pipes.

The tubes has swiveling eyes at its ends.
0.38 m hooks are used in mountings with single or double anchor strings, while with the 0.79 m hook is used to remove quadruple lower anchor strings.

The insulator plate has dual use: on one side fits insulators up to Ø 279 mm; and, on the opposite side, it adapts to insulators up to Ø 324 mm.

In conjunction with the cradle, tie rods are provided for coupling to the boom pole, a plate for retaining the upper insulator, hook arrangements, and metal spacers.