Product Description; Introduction; Overview - GE M60 Instruction Manual

2 PRODUCT DESCRIPTION

2 PRODUCT DESCRIPTION 2.1INTRODUCTION
The M60 Motor Protection System is a microprocessor based relay designed for the protection and management of
medium and large sized motors.
Overvoltage and undervoltage protection, thermal overload, fault diagnostics, and RTU functions are provided. The M60
provides phase, neutral, ground and negative sequence, instantaneous and time overcurrent protection. The time overcur-
rent function provides multiple curve shapes or FlexCurve™ for optimum co-ordination.
The relay also features an enhanced thermal model with custom curves, current unbalance biasing, and running and
stopped exponential cooling curves. An optional RTD module allows for the thermal model RTD bias function. Motor start
and supervision functions include starts per hour, time between starts, restart time, acceleration time, emergency restart,
and start inhibit. Sensitive directional power, mechanical jam, and current unbalance elements are also included as stan-
dard functions. Additional functions that are not part of the standard M60 element set can be easily configured and imple-
mented using the FlexElement™ and FlexLogic™ functionality.
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
engineering staff. All serial ports use the Modbus
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 10Base-F Ethernet interface which can be used to provide fast, reliable communications in noisy environments.
Another option provides two 10Base-F 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 (M60 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 M60 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.
Table 2–1: DEVICE NUMBERS AND FUNCTIONS
DEVICE FUNCTION
NUMBER
27P Phase Undervoltage
27X Auxiliary Undervoltage
32 Sensitive Directional Power
37 Undercurrent
37P Underpower
46 Current Unbalance
47 Phase Sequence Voltage
49 Thermal Overload
50BF Breaker Failure
50G Ground Instantaneous Overcurrent
50N Neutral Instantaneous Overcurrent
50P Phase Instantaneous Overcurrent
GE Multilin
®
RTU protocol. The RS485 ports may be connected to system computers
DEVICE
NUMBER
51G
59N
59P
59X
59_2
66
67N
67P
81O
81U
87S
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M60 Motor Protection System

2.1 INTRODUCTION

2.1.1 OVERVIEW

FUNCTION
Ground Time Overcurrent
Neutral Overvoltage
Phase Overvoltage
Auxiliary Overvoltage
Negative Sequence Overvoltage
Starts Per Hour, Time Between Starts
Neutral Directional Overcurrent
Phase Directional Overcurrent
Overfrequency
Underfrequency
Stator Differential
Mechanical Jam
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