CHAPTER 3: INSTALLATION
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL 3–19
power and trip coil supervision. CT inputs, VT inputs, and output relays do not require any
special precautions. Low voltage inputs (<30 V), RTDs, analog inputs, analog outputs, digital
inputs, and RS485 communication ports are not to be tested for dielectric strength under
any circumstance (see below).
FIGURE 3–19: Testing the 489 for Dielectric Strength
Courtesy of NationalSwitchgear.com
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