Power Measurement With 4-Wire Connection On Y Networks - WAGO 750-495/040-00 Series Manual

WAGO-I/O-SYSTEM 750 XTR
750-495/040-00x 3-Phase Power Measurement Module 690 V
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7.6 Power Measurement with 4-Wire Connection on
Y Networks
Take additional protective measures for voltages on the N connection that
are dangerous if touched
Voltages up to the nominal input voltage of the I/O module (U
measured directly if it is ensured that no voltage to ground that is dangerous if
touched can exist on the N connection of the I/O module during normal
operation. If this is not ensured, additional protective measures must be taken
(e.g., use of voltage transformers with basic insulation).
Otherwise, touch-proof protection from the system may no longer be given in the
event of a fault. This can cause electric shock or burns.
For voltages above the nominal input voltage, use voltage transformers
It is essential to use voltage transformers (VTs) to measure voltages above the
nominal input voltage of the I/O module (U
must be selected in such a way that the secondary voltages of the transformers
do not exceed the nominal input voltage of the I/O module.
Furthermore, the N connection on the module side must be grounded.
For line voltages U
insulation is required.
Otherwise, touch-proof protection from the system may no longer be given in the
event of a fault. This can cause electric shock or burns.
Always use current transformers
For measuring current, it is essential to use current transformers.
For line voltages U
required. For line voltages U
insulation are required.
Otherwise, touch-proof protection from the system may no longer be given in the
event of a fault. This can cause electric shock or burns. Furthermore, current
measurement without a current transformer can lead to a short circuit in the
power network and destruction of the I/O module.
> 400 V , use of voltage transformers with reinforced
LN RMS
≤ 400 V , current transformers with basic insulation are
LN RMS
> 400 V
LN RMS
Connect Devices 103
/U
LN
/U ). The voltage transformer ratio
LN LL
, current transformers with reinforced
) can be
LL
Manual
Version 1.2.0