ABB REL-300, Instruction Leaflet

Page: 101 / 135

I.L. 40-385.1B
5-6 (5/92)
5.2.26 Set the ZR value based on the absolute val-
ue of the ratio of the line impedances (Z
OL
/Z
1L
).
5.2.27 The LV units are used in CIFT, SPT and
weakfeed logic in the MDAR. They should normally
be set to 40 volts unless a higher setting is required
for more sensitive applications. Refer to Section
5.2.11 for the SPT application.
5.2.28 The polarizing approach for the directional
ground overcurrent unit is controlled by the setting of
DIRU. It has 3 selections:
ZSEQ --- Voltage polarization only.
DUAL --- Both voltage and current polarization.
NSEQ --- Negative sequence voltage and current
polarization.
5.2.29 Set GDIR to YES if directional control is re-
quired for the GB function.
5.2.30 Based on the requirements, set Close-Into-
Fault (CIF) and stub-bus protection functions, by se-
lecting the value field (CIFT/STUB/BOTH/NO) of
CIF, where:
CIFT --- CIF trip but not stub-bus protection has
been selected.
STUB --- Stub-bus protection but not CIF trip has
been selected.
BOTH --- Both CIF trip and stub-bus protection
have been selected.
NO --- Neither CIF nor stub-bus protection has
been selected.
Set LLT (loss-of-load trip) to YES, FDOG or NO,
where:
YES --- LLT trip with Z2 supervision.
FDOG --- LLT trip with both Z2 and FDOG super-
vision.
NO --- LLT trip function is not used.
5.2.31 Set LOPB to YES, if loss-of-potential block
trip function is required.
5.2.32 Set LOIB to YES, if loss-of-current block trip
function is required.
5.2.33 Set AL2S to YES, if trip alarm seal-in is re-
quired. The Reset pushbutton can be used to reset
the sealed AL2.
5.2.34 Set the SETR to YES if remote setting is
required.
5.2.35 Procedure to set the real-time clock:
5.2.36 With MDAR in the “setting” mode, scroll
the function field to TIME, and set the value to YES.
Depress function pushbutton RAISE to display
YEAR, MNTH (month, DAY, WDAY (week day),
HOUR, and MIN (minute), and set the corresponding
number via the value field. The MDAR clock will start
at the time when the minute value is entered.
5.3 GUIDANCE FOR RECLOSING INITIATION
MODE PROGRAMMING
5.3.1 For non-pilot without SPT system:
a. Select TTYP = OFF or 1PR, or 2PR or 3PR, and
b. Select PLT = NO, and
c. Use the RI2 output contact for the reclosing cir-
cuit, and
d. Select one or all of the Z1RI, Z2RI and Z3RI to
YES, depending on the application.
5.4 5.3.2 For non-pilot with SPT system:
a. Select TTYP = OFF or 1PR, or 2PR, or 3PR, or
SPR or SR3R and
b. Select one or all of the Z1RI, Z2RI and Z3RI to
YES, depending on the application.
c. Use the RI1 output contact for the SRI reclosing
timing circuit, and the RI2 output contact for the
3RI timing circuit.
The Reclosing Initiation mode will be based on the
TTYP setting, as shown in Table 5-2.