Electrical characteristics of KAGO contact clamps
Short-circuit test to norm IEC 1230
Test measurements on KAGO contact clamps type CGI12KV with M12 tapped thread.
Test results with rated current IN of 200 A/mm2:
Measurements 1995
Tested in laboratory "Oslo Energi Konsult AS" in Oslo.
| 50 mm2 grounding cable | 70 mm2 grounding cable | |
|---|---|---|
| IRMS | 11,5 kA for 1 second | 16,1 kA for 1 second |
| Ipeak | 28,7 kA | 40,25 kA |
Please click on the icon to open the whole report.
Measurements 2006
Tested in laboratory "Centre d'essais et de formation (CEF)" in Lausanne.
| 120 mm2 grounding cable | |
|---|---|
| IRMS | 38,6 kA during 124,7 ms |
| Ipeak | 79,88 kA |
Typical contact resistance
Contact resistance C—D < 70 micro ohm
Thermal effect on resistance characteristics of KAGO contact clamps
Test measurements were carried out at 500 Ampere DC. The current was shut off when the 95mm2 copper cable reached a temperature of 80°C, and switched on again after cooling down to approx. 5°C above ambient temperature.
As shown in the graphic, contact resistance remained practically constant over time despite repeated heating cycles. Results plotted here are the average of several tests.
Long-term characteristics of KAGO contact clamps
Various test measurements under operating conditions for several years prove that the contact resistance of KAGO contact clamps remains practically unchanged irrespective of weather effects. Clamp characteristics and efficiency are also unaffected by heavy vibrations. These favourable properties are due to the constant spring force, and to the small ribs under the clamping head which clean the rail base free of rust and dirt during hammering.