ABB REL300 Instruction Manual page 131

I.L. 40-385.7
missive underreach transfer trip) and BLK (blocking) in the pilot REL300. It should be set to the
desired selection.
5.2.16 For the pilot REL300 only, the WFEN (weakfeed enable) selection should be set to YES for the weak-
feed terminal, if applicable.
5.2.17 For permissive pilot REL300 only, the 3TRM (3 terminals) setting should be selected to YES for all
of the POTT/PUTT three terminals that apply, but for the BLK system the "YES" or "NO" makes
no difference. Refer to section 3.21 for the detailed information.
5.2.18 For application of POTT/BLK systems, the transient block logic is always in the POTT/BLK system,
but it is initiated by the reverse looking units. The Z3FR setting should be set to "YES" and Z3P,
Z3G should be set to 100% of the line impedance.
5.2.19 The FDGT (FDOG trip delay timer) can be set from 0 to 15 cycles or block (BLK) as desired. It is rec-
ommended to set to 3 cycles or longer. Refer to Section 3.5.4 for the detailed FDGT
information.
5.2.20 Distance/overcurrent units can be disabled if required by the application. The following distance/over-
current units can be disabled by setting the unit to OUT:
a. List of units which can be disabled:
PLTP, PLTG, Z1P, Z2P, Z2G, Z3P, Z3G, ITP, ITG and GB.
b. Procedure to disable the unit:
Switch REL300 to the setting mode, scrolling the function field to the proper function Then
set the unit to OUT via the value field.
5.2.21 Set T1 up to 15 cycles if Zone 1 delay trip is required.
5.2.22 The T2P, T2G, T3P and/or T3G timer functions can be disabled, if desired, by setting the timer to BLK.
5.2.23 The Zone 3 distance units (Z3P and Z3G) can be selected to reach forward-looking or reverse-looking
by setting the Z3FR (Zone 3 forward or reverse) to FWD or REV. For pilot application, Z3FR
must be set to REV.
5.2.24 Set the positive sequence impedance angle (PANG) value based on the positive sequence line im-
pedance angle. This setting affects the performance of the distance units.
5.2.25 Set the zero sequence impedance angle (GANG) value based on the zero sequence line impedance
angle. This setting affects the performance of the distance units.
5.2.26 Set the ZR value based on the absolute value of the ratio of the line impedances (Z
NOTE: The settings of PANG and GANG have been expanded from 40-90 to 0-90 degrees and
the ZR setting has been changed form 0.1-7.0 to 0.1-10.0 for underground cable appli-
cation. The setting rule of PANG, GANG and ZR must be followed: if the setting differ-
ence of PANG and GANG is greater than 50 degrees OR the ZR setting is greater than
7.0, the operating range of the maximum fault current should be limited to 200 am-
peres; otherwise, the microcontroller may give an un-predicted result.
5.2.27 The LV units are used in CIFT, SPT and weakfeed logic in the REL300. 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.
5-10
/Z ).
OL 1L