Product Description; Introduction; Overview - GE D60 Instruction Manual

2 PRODUCT DESCRIPTION

2.1 INTRODUCTION

2 PRODUCT DESCRIPTION 2.1INTRODUCTION

2.1.1 OVERVIEW

The D60 Line Distance Relay is a microprocessor-based relay intended for use on transmission lines of any voltage level,
without, with, and in the vicinity of series compensation, in three-pole and single-pole tripping applications. The primary
function of the relay consists of five phase and ground distance zones of protection, either mho or quadrilateral as per user
selection, with built-in logic for the five common pilot-aided schemes. The distance elements are optimized to provide good
measurement accuracy with a fast operating time, even when used with Capacitive Voltage Transformers, and can be
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supervised by detection of power swings. The relay also provides directional ground overcurrent elements, which are com-
monly used as part of an overall line protection system.
D60 phase distance zones can be configured to work with voltages and currents fed from VTs and CTs located indepen-
dently from one another on either side of a three-phase power transformer. The relay compensates accordingly to preserve
reach and correct target information regardless of the location and type of fault. This feature allows backup protection appli-
cations for generators and power transformers.
A Close-Into-Fault, or Switch-On-To-Fault, function is performed by the Line Pickup element. Out-of-step tripping, three-
pole/single-pole dual-breaker autoreclosing, synchrocheck, fault location, and many other functions are also available. In
addition, overcurrent and undervoltage protection, fault diagnostics, power metering, and RTU functions are provided. The
D60 provides phase, neutral, and ground time overcurrent protection. The time overcurrent functions can be programmed
with multiple curve shapes or FlexCurve™ for optimum coordination.
Voltage, current, and power metering is built into the relay as a standard feature. Current parameters are available as total
waveform RMS magnitude, or as fundamental frequency only RMS magnitude and angle (phasor).
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, and 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 or via the SNTP protocol over the Ethernet port. 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 which may be set to record the measured parameters before and after the event for viewing on a personal
computer (PC). These tools significantly reduce troubleshooting time and simplify report generation in the event of a sys-
tem fault.
A faceplate RS232 port may be used to connect to a PC for the programming of settings and the monitoring of actual val-
ues. A variety of communications modules are available. Two rear RS485 ports allow independent access by operating and
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engineering staff. All serial ports use the Modbus RTU protocol. The RS485 ports may be connected to system computers
with baud rates up to 115.2 kbps. The RS232 port has a fixed baud rate of 19.2 kbps. Optional communications modules
include a 10BaseF Ethernet interface which can be used to provide fast, reliable communications in noisy environments.
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Another option provides two 10BaseF fiber optic ports for redundancy. The Ethernet port supports IEC 61850, Modbus /
TCP, and TFTP protocols, and allows access to the relay via any standard web browser (D60 web pages). The IEC 60870-
5-104 protocol is supported on the Ethernet port. DNP 3.0 and IEC 60870-5-104 cannot be enabled at the same time.
The D60 IEDs use flash memory technology which allows field upgrading as new features are added. The following Single
Line Diagram illustrates the relay functionality using ANSI (American National Standards Institute) device numbers.
GE Multilin D60 Line Distance Relay 2-1