vi Manual Change Information Date Code 20020426
SEL-351-5, -6, -7 Instruction Manual
Revision
Date
Summary of Revisions
Section 3:
− Added additional pickup setting ranges for neutral ground overcurrent
elements operating from the 0.2 A nominal neutral channel (IN) current input.
− Added lower pickup setting ranges for residual ground overcurrent elements.
− Added Relay Word bits SFAST and SSLOW to Figure 3.24 for indication of
relative speed of systems (fast or slow slip) on either side of an open breaker.
− Added frequency element time delay setting recommendation, below
Table 3.10.
Section 4:
− Added VNOM setting (and resultant V1GOOD Relay Word bit output) to
Figure 4.1 and explained certain thresholds in the loss-of-potential logic,
relative to setting VNOM.
− Extensive changes in the balance of this section, dealing with the addition of
ground directional elements for low-impedance grounded, Petersen Coil
grounded, and ungrounded/high-impedance grounded systems. Figures 4.4
and 4.5 and Tables 4.1 and 4.2 provide the general overview and references
for all these changes.
− Supervising LOP (loss-of-potential) logic is removed from directional element
Figures 4.9, 4.10, 4.11, 4.12, 4.14, and 4.20 and put into preceding internal
enable logic Figures 4.6, 4.7, and 4.8.
Section 5:
− Added information on fault-type targeting (A, B, C) for Petersen Coil
grounded, and ungrounded/high-impedance grounded systems.
Section 6:
− Added an additional condition for the reclosing relay going to the Lockout
State (new reclose initiation occurs during open interval timing; this feature
had always existed, just not documented).
Section 9:
− Added the following Relay Word bits to Table 9.3:
SSLOW, SFAST, V1GOOD, V0GAIN, INMET, ICMET, IBMET,
IAMET, GNDSW, 50NF, 50NR, 32NE, F32N, R32N, 32NF, 32NR,
F32W, R32W, F32C, R32C, NSA, NSB, and NSC
− Added following setting for all settings groups: VNOM.
− Added following directional settings for all settings groups [for 0.2 A nominal
neutral channel (IN) current input]:
50NFP, 50NRP, a0N, 59RES, 32WFP, 32WRP, and 32WD
− Added S, P, and U (for low-impedance grounded, Petersen Coil grounded, and
ungrounded/high-impedance grounded systems, respectively) to setting range
for setting ORDER.
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