17-
2
750/760 Feeder Management Relay GE Power Management
17.2 PRELIMINARIES 17 COMMISSIONING
17
17.2 PRELIMINARIES 17.2.1 SAFETY PRECAUTIONS
HAZARD may result if the product is not used for its intended purposes
DANGEROUSLY HIGH VOLTAGES ARE PRESENT ON THE REAR TERMINALS OF THE RELAY,
CAPABLE OF CAUSING DEATH OR SERIOUS INJURY. USE EXTREME CAUTION AND FOL-
LOW ALL SAFETY RULES WHEN HANDLING, TESTING, OR ADJUSTING THE EQUIPMENT.
DO NOT OPEN THE SECONDARY CIRCUIT OF A LIVE CT, SINCE THE HIGH VOLTAGE PRO-
DUCED IS CAPABLE OF CAUSING DEATH OR SERIOUS INJURY, OR DAMAGE TO THE CT
INSULATION.
THE RELAY USES COMPONENTS WHICH ARE SENSITIVE TO ELECTROSTATIC DIS-
CHARGES. WHEN HANDLING THE UNIT, CARE SHOULD BE TAKEN TO AVOID CONTACT
WITH TERMINALS AT THE REAR OF THE RELAY.
ENSURE THAT THE CONTROL POWER APPLIED TO THE RELAY, AND THE AC CURRENT
AND VOLTAGE INPUTS, MATCH THE RATINGS SPECIFIED ON THE RELAY NAMEPLATE. DO
NOT APPLY CURRENT TO THE CT INPUTS IN EXCESS OF THE TIME
×
CURRENT SPECIFIED
LIMITS.
ENSURE THAT THE LOGIC INPUT WET CONTACTS ARE CONNECTED TO VOLTAGES BELOW
THE MAXIMUM VOLTAGE SPECIFICATION OF 300 VDC.
17.2.2 CONVENTIONS
The following conventions are used for the remainder of this chapter:
• It is assumed the relay VT and CT inputs are wired in accordance with Figure 3–9: TYPICAL WIRING DIA-
GRAM on page 3–7. With these connections, and assumed where ever phase angles are noted, a unity
power factor current in the primary circuit flows into the relay current marked terminal, with no phase shift
with respect to the corresponding phase-neutral voltage.
• Phase rotation of the relay test set is ABC.
• A current which lags a voltage has a positive phase angle.
• Phase A to neutral voltage is indicated by
V
an
(arrowhead on the “a“).
• Phase A to B voltage is indicated by
V
ab
(arrowhead on the “a“).
• The sign convention for power parameters is as shown in Section 6.3.6: POWER on page 6–11.
• The actual value display at the beginning of some sections is the display for the measured parameter. All
actual values are mentioned with their “path” as a means of specifying where to find the particular mes-
sage. For instance, the analog input, which in the message structure is located under actual values page
A2 METERING
as the first message under subheading
ANALOG INPUT
, would be written as:
A2 METERING \ ANA-
LOG INPUT \ ANALOG INPUT
.
CAUTION
CAUTION
CAUTION
CAUTION
CAUTION
CAUTION
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