Sel 735 Manual May 2026

Warning from the manual: Incorrect CT/VT ratios will corrupt all billing data. Always verify with a secondary injection test.

One of the reasons the SEL-735 is so popular is its ability to act as a Power Quality (PQ) monitor. The manual devotes a significant chunk of real estate to PQ Events.

Because the SEL-735 is often integrated into larger automation systems (DCS, BMS, SCADA), the manual provides specific register maps. sel 735 manual

The "Troubleshooting" section is the most dog-eared part of any printed SEL 735 manual. Here is a cheat sheet of common error codes:

| Parameter | Default | Typical Change | |-----------|---------|----------------| | PT ratio | 1:1 | 4160:120 | | CT ratio | 1:1 | 200:5 | | Demand interval | 15 min | 15 or 30 min | | Sag threshold | 90% of nominal | 90% | | Swell threshold | 110% | 110% | | THD alarm level | 5% | 8% per IEEE 519 | Warning from the manual: Incorrect CT/VT ratios will

Many users overlook the Load Profile capabilities (Section 9). The SEL-735 has 4 MB of non-volatile memory—enough for months of 15-minute interval data.

To export the load profile via serial: Use the LPD command. One of the reasons the SEL-735 is so

Pro Tip: The SEL-735 manual uses a shaded box icon to indicate warning (danger of death) vs. caution (damage to equipment). Do not skip shaded boxes.