Hioki CM4001 - Locating Insulation Failures; GFCI and RCD Trip Event Identification

6
Making Measurements
Locating an insulation failure (identifying GFCI and RCD trip events)
By measuring leakage current of the entire circuit using the ground wire of the transformer
(location 1 in the gure below), you can determine the presence or absence of an earth leakage in
accordance with changes in leakage current.
When you nd an earth leakage, perform the bundled measurement of all the wires from the power
supply side toward the load side to locate an insulation failure.
To investigate an intermittent earth leakage, such as intermittent ground-fault circuit
interrupter (GFCI) and residual-current device (RCD) trip events, the event recording
function will help you.
When a measured value exceeds the set threshold value, the function records the
event data (event occurrence time, event stop time, maximum value). The Z3210
Wireless Adapter (option) is required.
For detail information, please visit our website.
GENNECT Cross > Functions > Event Recording
Single-phase 3-wire circuit
• If the insulation on the wire has deteriorated at location A in the gure, you can detect the leakage
current through the measurement by clamping around bundled wires, not at location
3
but location
2
.
• If the insulation on the load device has deteriorated at location B in the gure, you can detect the
leakage current through the measurement by clamping around the bundled wires, not at location
5
but location
4
.
Ig
B
A
1
2 3
4 5
PE
Circuit
breaker
Load
equipment
Load
equipment
Leakage
current
:
HIOKI CM4001A963-00