Heat Shrink High Voltage Joints

1 

Applicable Standards 

IEC 60840 

2 

Nominal System Voltage 

66kV Phase to Phase 

3 

Highest System Voltage 

72.5kV 

4 

Impulse Voltage at 95 to 1000C temperature 

325kV (Peak) 

5 

Frequency 

50 Hz. 

6 

AC High Voltage withstand test 15 min dry 

95 kV 

7 

Partial Discharge Test at Ambient 

Pre-Stressed at 1.75U0 (67kV) 10sec 

Measured at 1.5U0 (57kV)  

Less than 5pC 

8 

Partial Discharge Test at Elevated (95-1000C)  

Pre-Stressed at 1.75U0 (67kV) 10sec 

Measured at 1.5U0 (57kV) 

Less than 5pC 

9 

Heating Cycle Voltage Test 

1. Total Duration of one cycle 

24hr 

1. Duration of Heating period 

8hr 

1. Duration of natural cooling period 

16hr 

1. Temp. of conductor during heating 

95 to 1000C 

1. AC voltage applied during test 

76kV 

1. No. of cycles 

20 

10 

Short Circuit Current 

Same as cable size subject to max. Conductor temperature of 250oC  

11 

Creepage (outdoor) 

2300mm min. 

12 

Accessories 

Mechanical connectors (if ordered separately for terminations) 

13 

Method of Stress Control 

Heat Shrinkable type 

14 

Tubing’s & Molded parts 

Heat Shrinkable type 

15 

Non-Tracking material  

As per ASTM D-2303 

16 

Di-electric strength of insulating material 

10 kV/mm min 

Heat Shrink Type Indoor/Outdoor Termination and Straight Through Joint for 66kV (E)