ABB MDAR Instruction Manual page 4

I.L. 40-385.5
1. Standard precautions of static voltage discharges should be observed such as using a
grounded wrist strap when handling Integrated Circuits.
2. Remove chips U103 and U104 from the Microprocessor module.
3. Replace chips U103 (G13) and U104 (G14) into the sockets.
4. Reprogram MDAR password through INCOM
5. It is recommended to verify the relay's operation per Section 2 of Appendix A2 (Acceptance/
Maintenance Tests).
1. PILOT SYSTEM
a) The setting of Z3FR must be set to "REV" for system transient block and unequal pole external fault
clearing.
b) The minimum setting of FDGT should be 3 cycles unless for some special application.
c) The carrier equipment for the use of the Blocking System should have a sending/self-receiving feature
in order to block both ends for 3 cycles if a reverse fault is detected.
2. LOAD LOSS TRIP (LLT)
For a system if its maximum tapped load may exceed minimum through-load in the protected line, the
setting of LLT should be set to "NO". Refer to section 9.12 for the detailed information.
3. RECLOSE APPLICATION
The signals from MDAR to Recloser are Reclose Initiate RI2 (3-pole), RI1 (Single-pole) and Reclose
Block (RB). The Reclose relay should have the following feature: if the Recloser receives RI and RB, the
RB should have the preference and reset/lockout the reclose timer.
For a single-pole and high-speed trip application (TTYP=SRI/SR3R), the FDOG trip path for the high resis-
tance ground fault detection may not work for the phase-phase-ground fault condition because the phase
selector shows a fault type of phase-phase fault and it expects the Z1P or PLTP trip only. The purpose of
FDOG is for the detection of single phase with high resistance to ground fault only.
IMPORTANT APPLICATION NOTES
SINGLE-POLE TRIP APPLICATION
ii
®
remote communication.