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Protection & Control: Key Benefits

The T60 transformer protection system provides comprehensive three-phase transformer protection for medium and large power transformers. It features dual-slope, dual-breakpoint differential restraint; transformer overexcitation protection; and five zones of backup distance protection with power swing detection. As part of the Universal Relay family, the T60 offers superior protection and control for transformers.

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Iván P. Moreno
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73 views3 pages

Protection & Control: Key Benefits

The T60 transformer protection system provides comprehensive three-phase transformer protection for medium and large power transformers. It features dual-slope, dual-breakpoint differential restraint; transformer overexcitation protection; and five zones of backup distance protection with power swing detection. As part of the Universal Relay family, the T60 offers superior protection and control for transformers.

Uploaded by

Iván P. Moreno
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Protection & Control

Key Benefits
• Dual-slope, dual-breakpoint differential restraint characteristic, restrained and unrestrained differential

• 2nd harmonic inrush and overexcitation inhibit

• Transformer overexcitation protection

• Restricted ground fault

• Loss-of-life, aging factor, hottest spot

• Five zones backup distance protection with power swing detection and load encroachment function

• Synchrocheck, ROCOF, over and under frequency

Protection & Control

The T60 transformer protection system is a comprehensive three-phase transformer relay designed to protect medium and large power transformers.
The T60 provides automatic or user-definable magnitude reference winding selections for CT ratio matching, and performs automatic phase shift
compensation for all types of transformer winding connections. The T60 algorithm allows the user to enable removal of the zero-sequence current
even for delta-connected transformer windings, facilitating transformers with a variety of grounding configurations. As part of the Universal Relay (UR)
Family, the T60 provides superior protection and control.

Functional Block Diagram


ANSI Divice Numbers & Functions

DEVICE FUNCTION DEVICE FUNCTION DEVICE FUNCTION


NUMBER NUMBER NUMBER
21P Phase Distance 50P Phase Instantaneous 67N Neutral Directional
21G Ground Distance Overcurrent Overcurrent

24 Volts Per Hertz 50/87 Instantaneous Differential 67P Phase Directional


Overcurrent Overcurrent
25 Synchrocheck 51G Ground Time Overcurrent 68 Power Swing Blocking
27P Phase Undervoltage 51N Neutral Time Overcurrent 78 Out-of-Step Tripping
27X Auxiliary Undervoltage 51P Phase Time Overcurrent 81O Overfrequency
49 Thermal Overload 59N Neutral Overvoltage 81U Underfrequency
50BF Breaker Failure 59P Phase Overvoltage 81R Rate of Change of
50G Ground Instantaneous 59X Auxiliary Overvoltage Frequency (ROCOF)
Overcurrent 87G Restricted Ground Fault
50N Neutral Instantaneous 87T Transformer Differential
Overcurrent

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