ABB REL301 Instruction Manual page 115

I.L. 40-386.3
The current required to trip can be calculated using the following:
From Table H-1 :
• Zone1G
• ANG POS = 75°
• ZR=ZOL/Z1L = 3.0
using an X = 75° (lagging)
The current required to trip = 4.00A ± 5 % for fault current lagging fault voltage by 75°. This is
the maximum torque angle test. For other points on the MHO circle, change X to a value be-
tween 0° and 150°, and calculate the value of I. This formula is valid for Zone1G R set to 0.01
ohms.
When the relay trips, remove the fault current. Zone1 and AG LED's will light. The LCD
display will indicate the fault distance. Using the RAISE and LOWER push-buttons the
complete fault record can be reviewed. See Table 4-3 for a description of the displayed
fault data quantities.
The significant quantities to review are:
All trip associated contact outputs, should be monitored as a part of this test. Connect
appropriate monitoring equipment to the "dry" contact outputs to be monitored. See
Figures 4-1, 4-2 and 4-3 for contact output connection. Additionally, with an external
jumper connected between TB1 (SYST TEST) and FT-5 (FRI/RI ENA), the following can
be observed:
1. Breaker failure initiate (BFI) BFIA-1 and BFIA-2 are closed as long as the fault is applied
after the trip decision is made. BFI contacts "follow" the trip contacts.
2. General Start (GS) contact will pick-up for approximately 50 ms immediately after the fault
is applied.
3. Trip alarm (Trip alarm, Al-2), relay will pick-up and remain picked up as long as the fault is
applied, after the trip decision is made. The AL-2 contact "follows" the trip contacts. After
the fault has been removed, AL-2 will remain picked up since the "Trip Alarm" is set to Seal-
in. Alarm 2 can then be reset by pushing the RESET push-button.
5-8
I = --------------------------------------------------------------------------------------------- -
(
Z COS PANG X
1G
= 4.5 Ω
Fault Type – "FLT Type" "AG"
Targets – "Zone1G" "Yes"
Fault Voltages (VA, VB, VC, 3V0 and Currents (IA, IB, IC, IP)
V
LN
( )
Z
– 1
R
) 1
– + -------------------- -
3
(10/94)