Entec EVR, User Manual

Page: 33 / 40

EVR AUTOMATIC RECLOSER http://www.entecene.co.kr
33
EN
HANCED
TEC
HNOLOGY
5.3.4. High voltage connection
Before installation, all terminals and connectors should be cleaned and prepared to be able to keep
low resistance connection.
Please refer to bushing assembly drawings shown in Figure 5-7.
Porcelain Bushing
The high voltage bare conductor should be placed in the hole of the universal clamp and fastened
with nut upto tensile torque of 400kg-cm.
Polymer Bushing
For the polymer mold type of bushing, the stud clamp type made of anti-corrosive bronze is placed
on the top of bushing.
Insert HV cable directly into the center of stud clamps placed on the top of polymer bushing, and
fasten four joint bolts evenly with tensile torque of 150kg-cm.
5.3.5 Bushing
Depending on request, Bushing of Recloser is made of either porcelain or polymer.
Bushing and bushing housing is completely assembled and tested at the factory before dispatching.
Simply users connect the high voltage cable onto High Voltage Terminal at the top of Bushing.
Porcelain Bushing
Table 5-1. Porcelain Bushing
Type Creepage distance Arcing distance Terminal type Applicable cable size Rating (Amps)
EVR 1 440 m/m 220m/m Universal clamp 24 m/m (diameter) 630
EVR 2 750 m/m 300 m/m Universal clamp 24 m/m (diameter) 630
Polymer Bushing
Type of Bushing is Separable connector type standardized by IEEE 386, the material of Insulation
Housing can be made of either E.P.D.M or Silicone.
Table 5-2. Polymer Bushing
Type
Creepage
distance
Arcing Distance Terminal type
Applicable
cable size
Rating
(Amps)
Housing
Material
EVR1 520 m/m 220 m/m STUD clamp 25 m/m(Max.dia.) 630 EPDM/Silicone
EVR2 860 m/m 330 m/m STUD clamp 25 m/m(Max.dia.) 630 EPDM/Silicone
EVR3 1100 m/m 400 m/m STUD clamp 30 m/m(Max.dia.) 800 EPDM/Silicone