Product Description - GE T60 Instruction Manual

T60 Transformer Protection System
Chapter 2: Product description

Product description

This chapter outlines the product, order codes, and specifications.
2.1 Product description
The T60 Transformer Protection System is part of the Universal Relay (UR) series of products. It is a microprocessor-based
relay for protection of small, medium, and large three-phase power transformers. The relay can be configured for a
maximum of six three-phase current inputs and six ground current inputs, and can satisfy applications with transformer
windings connected between two breakers, such as in a ring bus or in breaker-and-a-half configurations. The T60
performs magnitude and phase shift compensation internally, eliminating requirements for external CT connections and
auxiliary CTs.
The percent differential element is the main protection device in the T60. Instantaneous differential protection, volts-per-
hertz, restricted ground fault, and many current, voltage, and frequency-based protection elements are also incorporated.
The T60 includes 16 programmable universal comparators, or FlexElements™, that provide additional flexibility by allowing
the user to customize their own protection functions that respond to any signals measured or calculated by the relay.
The metering functions of the T60 include true root mean square (RMS) and phasors for currents and voltages, current
harmonics and total harmonic distortion (THD), symmetrical components, frequency, power, power factor, and energy.
Diagnostic features include an event recorder capable of storing 1024 time-tagged events, oscillography capable of
storing up to 64 records with programmable trigger, content, and sampling rate, as well as data logger acquisition of up to
16 channels, with programmable content and sampling rate. The internal clock used for time-tagging can be synchronized
with an IRIG-B signal, using the Simple Network Time Protocol (SNTP) over the Ethernet port, or using the Precision Time
Protocol (PTP). This precise time stamping allows the sequence of events to be determined throughout the system. Events
can also be programmed (via FlexLogic™ equations) to trigger oscillography data capture that can be set to record the
measured parameters before and after the event for viewing on a computer. These tools significantly reduce
troubleshooting time and simplify report generation in the event of a system fault.
Several options are available for communication. An RS232 port (USB port with the graphical front panel) can be used to
connect to a computer to program settings and monitor actual values. The rear RS485 port allows independent access by
operating and engineering staff. It can be connected to system computers with baud rates up to 115.2 kbps. All serial ports
use the Modbus RTU protocol. The IEC 60870-5-103 protocol is supported on the RS485 interface. IEC 60870-5-103, DNP,
and Modbus cannot be enabled simultaneously on this interface. Also only one of the DNP, IEC 60870-5-103, and IEC
60870-5-104 protocols can be enabled at any time on the relay. When the IEC 60870-5-103 protocol is chosen, the RS485
port has a fixed even parity and the baud rate can be either 9.6 kbps or 19.2 kbps. The 100Base-FX or 100Base-TX Ethernet
interface provides fast, reliable communications in noisy environments. The Ethernet port supports IEC 61850, IEC 61850-
90-5, Modbus/TCP, TFTP, and PTP (according to IEEE Std. 1588-2008 or IEC 61588), and it allows access to the relay via any
standard web browser (T60 web pages). The IEC 60870-5-104 protocol is supported on the Ethernet port. The Ethernet port
T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 2-1