pplication Notes
P74x/EN AP/N
1, P742, P743 (AP) 6-
5. Put the right addresses into the KITZs
(using comms.xls)
6. Download the complete setting files into the relays
(using S1)
7. Download the setting files into the KITZs
(using comms.xls)
8. Download the PSL files into the relays
(using S1)
9. Test the PSLs & Analogue inputs
(using a Inputs / Outputs and current generator)
10. Put the default Substation Testing Box relay settings
(using S1)
11. Test the Topology according to the test specification
12. Test the communication links (KITZ)
(using Master (courier))
13. Perform the FAT with the customer
14. Put the project relay settings
(using S1)
Commissioning phase:
1. Check the inputs / outputs
2. Check CT connections (per phase (A, then B, then C))
3. Add Rb & Rbph/Rbn CT parameters in the Pus
(using RBurden_b.xls)
4. Check the measurements and the tripping slopes
(see documentation)
7.2 General Substation information
Only a few system parameters are required and it is vital that these are included.
• Number of feeders, bus couplers, bus sections
• Positions of bus sections
• Positions of switchgear plant i.e. circuit breakers, isolators
• Positions of CTs (including the polarity (P1/P2 – S1/S2))
• Planned future extensions with circuit breaker, isolator and current transformer (CT)
• Type of electrical network earthing (Solid, High impedance or compensated)
7.3 Short Circuit Levels
Maximum external fault current (phase to phase and phase to ground faults)
• Solid:
− Minimum two phase busbar fault current
− Minimum load current on the smallest feeder
− Maximum load current on the biggest feeder or coupler
− Optional: Maximum three phase busbar fault current
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