Introduction
Description
These instructions do not purport to cover all details or variations in equipment nor provide for every possible contingency to be met in connection with installation, operation, or maintenance. Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser's purpose, the matter should be referred to the General Electric Company.
To the extent required, the products described herein meet applicable ANSI, IEEE, and NEMA standards; but no such assurance is given with respect to local codes and ordinances because they vary greatly.
The 745 Transformer Management Relay™ is a high-speed, multi-processor-based, three-phase, two- or three-winding transformer management relay intended for primary protection.
The 745 combines Percent Differential, Overcurrent, Frequency, and Overexcitation protection elements along with monitoring of individual harmonics and THD in one economical package.
The relay provides a variety of adaptive relaying features:
•Adaptive Harmonic Restraint which addresses the problem of false tripping during inrush
•Adaptive Time Overcurrent elements which will adjust their pickup settings based on the calculated transformer capability when supplying load currents with high harmonic content.
•Multiple Setpoint Groups which allow the user to enter and dynamically select from up to four groups of relay settings to address the protection requirements of different power system configurations
•Dynamic CT Ratio Mismatch Correction, which monitors the on-load tap position and automatically corrects for CT ratio mismatch
•FlexLogic™ which allows PLC-style equations based on logic inputs and protection elements to be assigned to any of the 745 outputs.
The 745 also includes a powerful testing and simulation feature. This allows the protection engineer the ability to test the relay operation based on captured or computer-generated waveform data, which can be converted to a digitized format and downloaded into the 745's simulation buffer for "playback". A WaveformCapture function that records waveform data for fault, inrush, or alarm conditions is also provided. The Auto-Configuration function eliminates the need for any special CT connections by having all CTs connected in wye.
SR745-W2-P1-G1-HI-E-H
SR745-W2-P5-G5-HI-A
SR750-P5-G5-S5-HI-A20-R
T30-04E
T35
TED134050WL
TP1616SS
TPMC815-11
