EATON ELECTRICAL
24
Predictive Diagnostics
2.2.3 Installation
2.2.3.1
Step 1 – Hardware (This paragraph covers main guide-line. Chosen
InsulGard options must be taken into account in every particular case.)
•
Select a convenient location for an InsulGard enclosure. It should be as close as
possible to the equipment being monitored. Avoid locations with excessive
vibrations, heat and direct sun light. Cable length from PD sensors should not
exceed 150ft (50m). It is usually convenient to install the device in the center of the
sensor locations, keeping PD signal cable lengths approximately the same. It is not
necessary having cable lengths exactly the same.
•
Run conduits (if necessary) for the cables to all PD sensors, communication, analog
signal cable, and for the power supply. The cable entry is at the right and the left
bottom of the enclosure. Follow respective installation manual for the wiring to PD
sensors.
•
Install Current Sensor on the secondary circuit of a current transformer measuring
the equipment load current. A phase is preferred, but is not obligatory.
Note: It is
frequently less expensive installing an additional Current Transformer inside a
motor termination enclosure, then run conduits and wires from a distant
breaker. We designed an option using easy to install FlexCore CT. Check
before making a decision.
•
Install the voltage sensor at the secondary of the closest PT associated with the
monitored equipment.
Note: Do not connect to PT at this time.
•
Install an RTD sensor (if ordered separately) inside switchgear at a suitable location
closely representing the inside temperature (It could be a rear compartment at the
middle of a lineup). In case of a motor or generator, use one of the spare winding
RTDs; otherwise, locate an additional RTD at a suitable location closely representing
stator winding temperature.
•
Install a humidity sensor (if ordered separately) inside the switchgear at a suitable
location closely representing the inside humidity (a rear compartment at the middle
of a lineup). In case of a motor or generator, a humidity sensor should be installed
inside the motor terminal enclosure to represent humidity at the line terminals.
Insulation near line terminals is mostly influenced by humidity variations.
•
The modem has already installed (if ordered) on InsulGard panel. Use a 2-wire
telephone cable with RJ11 connectors to connect the modem to a dedicated analog
telephone line. The modem can also be installed at separate location. Several
InsulGards can be networked together via RS-485 network and use one modem for
all of them.
•
If several InsulGards are networked together, use a daisy-chain configuration. The
chain must be terminated with approximately 120 Ohms at the end.
•
Run all cables into the InsulGard enclosure. An excess of cables in the
enclosure should not be less then 24” for terminating.
Note: Label all
cables
.
