Caution Signs - Hitachi Relion RES670 Commissioning Manual

Section 2
Safety information
2.3

Caution signs

18
Never connect or disconnect a wire and/or a connector to or from a IED during normal
operation. Hazardous voltages and currents are present that may be lethal. Operation
may be disrupted and IED and measuring circuitry may be damaged.
Dangerous voltages can occur on the connectors, even though the auxiliary voltage has
been disconnected.
Always connect the IED to protective ground, regardless of the operating conditions.
This also applies to special occasions such as bench testing, demonstrations and off-site
configuration. This is class 1 equipment that shall be grounded.
Never disconnect the secondary connection of current transformer circuit without short-
circuiting the transformer's secondary winding. Operating a current transformer with the
secondary winding open will cause a massive potential build-up that may damage the
transformer and may cause injuries to humans.
Never remove any screw from a powered IED or from a IED connected to powered
circuitry. Potentially lethal voltages and currents are present.
Take adequate measures to protect the eyes. Never look into the laser beam.
The IED with accessories should be mounted in a cubicle in a restricted access area
within a power station, substation or industrial or retail environment.
Whenever changes are made in the IED, measures should be taken to avoid inadvertent
tripping.
The IED contains components which are sensitive to electrostatic discharge. ESD
precautions shall always be observed prior to touching components.
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Phasor measurement unit RES670
Commissioning manual
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