GEK-113285A G650 Generator Protection & Control System 5-71
5 SETTINGS 5.4 PROTECTION ELEMENTS
5
Table 5–73: 59G ELEMENT SETTINGS
The snapshot event setting enables or disables the snapshot event generation for this element.
5.4.10 POWER
5.4.10.1 DIRECTIONAL POWER ELEMENT (32)
a) ELEMENT DESCRIPTION
The Directional Power element responds to three-phase active power measured from the feeder associated to the G650.
This element can be selected to operate according to the power threshold adjusted in the corresponding setting. This
element is ideal for reverse power applications (F32 REV) or forward power (F32 FWD), depending on the selected setting.
The relay measures the three-phase power for wye or delta connections.
The element has an adjustable characteristic angle and minimum operating power as shown in the Directional Power
Characteristic diagram. The element responds to the following condition:
P cos(ϕ) + Q sin (ϕ) > SMIN
where: P and Q are active and reactive powers as measured per the G650 convention, ϕ is the angle set at the 32 setting
(DIR POWER ANGLE) in degrees in steps of 0.01º, and SMIN is the minimum operating power.
The element has two independent (as to the pickup and delay settings) elements. Both elements can be used for alarm and
trip, and they can be set separately to provide a mixed power protection.
The Directional Power Characteristic is shown in the following diagram.
Figure 5–13: POWER DIRECTIONAL CHARACTERISTIC
By making the characteristic angle adjustable from 0º to 360º in steps of 0.01º, a variety of operating characteristics can be
achieved as presented in the figures below. For example, for an angle of 0º, the element would operate as a 32 Forward
Power element, while if setting an RCA angle of 180º, the element would operate as a 32 Reverse Power element. For
angles of 90º and 270º, the case would be similar but with reactive power.
SETPOINT > PROTECTION ELEMENTS > VOLTAGE ELEMENTS > GROUND OV >
GROUND OV 1> GROUND OV 2 > GROUND OV 3
SETTING DESCRIPTION NAME DEFAULT VALUE STEP RANGE
Function permission Function DISABLED N/A [DISABLED – ENABLED]
Pickup Level Pickup Level 10 1 V [3 : 500]
Trip time Trip Delay 10.00 0.01 s [0.00 : 900.00]
Reset time Reset Delay 0.00 0.01 s [0.00 : 900.00]
Snapshot Event generation Snapshot Events ENABLED N/A [DISABLED – ENABLED]
DIR POWER ANGLE
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