Power Network Application Trainer
– Earthing / Grounding network impedance measurement
117
4.1.5 HF measuring method
– resistance/inductive type with
simulated GW connection
Figure 75-2: HF measuring method setup
The HF measuring method is intended for earth resistance measurement of pylons
connected via overhead ground wire. The HF method automatically eliminates the
inductive component.
Switch position Simulated condition
Application
Expected result
Regular measurement place
condition (simulated resistance
/inductive earth character),
simulated ground wire connection
Pylons (mono and multi-leg)
with and without protective earth
cable connection
Ski lifts
Radio towers
Re = 2,7
Ω @ HF at 25 kHz, R type
Re = 6.2
Ω @ HF at 25 kHz, L type
Table 38-2: HF measurement method setup/result presentation
Measuring procedure:
6. Select proper switch position on the training module:
7. Under
Earth
test function select the
HF
measurement method
Summary of Contents for MI 3298
Page 55: ...Power Network Application Trainer Earthing Grounding network impedance measurement 55 ...
Page 56: ...Power Network Application Trainer Earthing Grounding network impedance measurement 56 ...
Page 124: ...Power Network Application Trainer Earthing Grounding network impedance measurement 124 ...
Page 228: ...MI 3290 Earth Analyser 228 ...
Page 229: ...MI 3280 Digital Transformer Analyser 229 ...
Page 230: ...MI 3280 Digital Transformer Analyser 230 ...
Page 231: ...MI 3250 MicroOhm 10A 231 ...
Page 232: ...MI 3205 TeraOhmXA 5kV 232 ...