Double-Break Disconnectors

Type SSBIII up to 550 kV

The horizontal double-break disconnectors consist of three poles. Each pole has a frame, two supporting insulators at each end and one rotating insulator in the center, on which the main blade is mounted.

• More than 75 years of experience
• Durable and reliable design
• Over 120,000 disconnectors and earthing switches are in service in more than 100 countries throughout the world
• Virtually maintenance-free

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Features

Frame

The frame is made of a square tube in which in the center the bearing housing and the turntable are installed. The turntable is supported by two roller bearings. The bearing housing is sealed and filled up with grease, to ensure a long lifetime. All steel parts of the disconnector are hot-dip galvanized.

Insulators

The disconnectors can be equipped with insulators in accordance with IEC, ANSI, or DIN specifications.

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.

Main Blade

The main blade consists of two fixed contacts, mounted on the supporting insulators, and a moving blade mounted on the rotating insulator. The main contacts are installed inside the main blade. They are made of copper, with a silver-plated surface.

Each contact finger is provided with stainless steel springs to ensure reliable contact pressure. The contacts are self-cleansing, which makes the disconnector suitable for installation in areas with severe climatic conditions. Depending on the voltage rating, anti-corona shields will be provided.

Earthing switch

HAPAM disconnectors may be equipped with earthing switches, which can be built on to the right hand side and/or to the left hand side. The earthing switch consists of an aluminum tube, provided with silver-plated contacts at both ends.

Testing

The disconnectors and earthing switches are designed and tested in accordance with the latest IEC specifications. HAPAM maintains a quality assurance system according to ISO 9001, certified by KEMA.

Installation

The disconnectors and earthing switches are pre-assembled and adjusted in our works as completely as possible.

The construction is designed so that all disconnectors can be installed and adjusted at the 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 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.

General Specifications

Rated Voltage	kV	72.5	123	145	245	550
Lightning Impulse Withstand Voltage
to earth	kV	325	550	650	1050	1550
across the isolating distance	kV	375	630	750	1200	1550
						+ 315
Power Frequency Withstand Voltage
to earth	kV	140	230	275	460	620
across the isolating distance	kV	160	265	315	530	800
Lightning Impulse Withstand Voltage
to earth	kV	–	–	–	–	1175
across the isolating distance	kV	–	–	–	–	900
						+ 450
Current and Short Circuit Ratings
	1600 A-80 kA peak – 32 kA/3 sec
	2000 A-100 kA peak – 40 kA/3 sec
	3150 A-125 kA peak – 50 kA/3 sec
	4000 A-160 kA peak-63 kA/3 sec