Over and above the TDD Limits
a. Even harmonics on current are limited to 25% of the odd harmonic limits (Refer Table 2, 3 and
4 on IEEE-519-2022)
b. Current distortions that result in a dc offset are not allowed
c. For power generation equipment refer the IEEE-519 standard
d. Refer Table 5 for Recommended multipliers for increases in harmonic current limits
Above result is for indicative purpose only. Also refer country specific or local utility
standard if applicable.
TDD Calculator
Calculate a TDD Value for a Single Conductor
Fault Isc (kA)
Isc/Il
TDD Range as per IEEE 519-2022 at PCC
TDD Calculator
Calculate a TDD Value for a Two Different Conductors
Fault Isc (kA)
Isc/Il
TDD Range as per IEEE 519-2022 at PCC
*Note - Above calculation is applicable only for Table 2 of IEEE 519-2022 Regulations (120V through 69Kv). For other voltage level categories contact our support team.