General
The pantograph disconnector consists of three poles. Each pole consists of one support insulator, one rotating insulator, the pantograph mechanism and a counter contact.
Insulators
The disconnectors can be equipped with insulators in accordance with IEC, ANSI or DIN specifications.
Pantograph mechanizm
The pantograph mechanism is installed on the support insulator and transfers the movement of the rotating insulator to the arms of the pantograph disconnector. The mechanism is housed in an aluminium enclosure, protecting it against pollution and ice. The springs that compensate the weight of the pantograph arms are also installed in this housing. Each pantograph is equipped with four aluminium arms to ensure a rigid construction with a very high short circuit rating.
The main contacts are made of copper, with a silver plated surface. The counter contact is a horizontal copper bar, silver-plated, which has to be connected to the busbar system.
Earthing switch
Hapam pantograph disconnectors may be equipped with earthing switches. The earthing switch consists of an Aluminum tube, provided with silver-plated contacts at both ends.
Drive mechanism
The disconnectors and/or earthing switches can be single-pole or three-pole operated by means of a motor-operated drive mechanism or a manual-operated drive mechanism.
In case only one drive mechanism is used for three-pole operation, the poles are interconnected by means of adjustable coupling rods. The drive mechanism also houses the auxiliary contacts for position indication.
Testing
The disconnectors and earthing switches are designed and tested in accordance with latest IEC specifications. Hapam maintains a quality assurance system according to ISO 9001, certified by DEKRA (previously known as KEMA).
Installation
The disconnectors and earthing switches are pre-assembled and adjusted in our works as complete as possible. The construction is designed so that all disconnectors can be installed and adjusted at site very easily, without the need of any special tools. Hapam provides clear installation instructions and assembly drawings.
Maintenance
The disconnectors and earthing switches supplied by Hapam are designed so as to ensure that they are virtually maintenance free. However, to warrant a long and trouble-free service period, we advise that a visual inspection of the contacts and bearing points be carried out at regular intervals.
