CENTRE BREAK DISCONNECTORS

Product Highlights

BASE ASSEMBLY :
The base frame is made out of a fabricated steel structure designed to withstand all the external forces like wind load, dead weight of Insulator & contacts, short circuit force and seismic force etc. Both the rotating post is supported by two nos. ball bearing one at top & one at bottom of the bearing housing with adequate distance between them to avoid wobbling of Insulator

CONTACTS :

The main Contact consists of a U- Shaped tube, in which the main contacts and the rotating contacts are installed. The U-shaped tube is either Copper/Aluminium with copper contact fingers plated with silver. Each contact fingers is provided with stainless steel springs to ensure reliable contact pressure.

The jaw and fist type contacts are so designed that the current transfer takes place through multi-point contacts that are equipped with stainless springs, which ensure low contact resistance. Wiping action carried out during closing & opening of isolator and the design ensures low operational torque and smooth & effective closing of contacts.
The rotating contacts Disconnectors transfers the current from the terminal stud to the moving blade through silver plated bronze ball contacts that are housed in a bronze housing and pressed against the stud and housing though a stainless steel spring. The rotating contact construction is completely sealed to ensure maintenance free operation
The contacts are self cleansing type and provided with “Dead Centre Mechanism” that ensures the locking of Disconnector in both close and open position in case of extreme external forces such as wind force, short circuit force, seismic force etc.

Technical Data

TECHNICAL DATA –Horizontal Centre Break
		36	72.5	123	145	170	245	300	362	420
LIGHTNING IMPULSE WITHSTAND VOLTAGE TO EARTH ACROSS ISOLATING DISTANCE	kV kV	170 195	325 375	550 630	650 750	750 860	1050 1200	1050 1050 +170	1175 1175 +205	1425 1425 +240
POWER FREQUENCY WITHSTAND VOLTAGE TO EARTH ACROSS ISOLATING DISTANCE	kV kV	70 80	140 160	230 265	275 315	325 375	460 530	460 530	460 530	520 610
SWITCHING IMPULSE WITHSTAND VOLTAGE TO EARTH ACROSS ISOLATING DISTANCE	kV kV	- -	- -	- -	- -	- -	- -	850 700 +245	950 800 +295	1050 900 +345
CURRENT AND SHORT CIRCUIT RATINGS	UP TO 4000A, STC 50kA - 125 kAp

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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