Category: GE

Scalable Hardware

The M60 is available with a multitude

of I/O configurations to suit the most

demanding application needs. The

expandable modular design allows for

easy configuration and future upgrades.

• Multiple CT/VT configurations allow for

the implementation of many protection

schemes, including applications with

high-impedance machine grounding

• RTD inputs allow biasing of the

motor thermal model, as well as

overtemperature protection of the

stator, bearings, and other heat

sensitive components of the motor

• Types of digital outputs include trip

rated Form-A and Solid State Relay

(SSR) mechanically latching, and

Form-C outputs

• DCmA inputs are available to monitor

equipment and process parameters

Monitoring and Metering

The M60 includes high accuracy metering

and recording for all AC signals. Voltage,

current, and power metering are built into

the relay as a standard feature. Current and

voltage parameters are available as total

RMS magnitude, and as fundamental

frequency magnitude and angle.

IEC 61850 Process Bus

The IEC 61850 Process Bus module is

designed to interface with the Multilin

HardFiber System, allowing bi-directional

IEC 61850 fiber optic communications. The

HardFiber System is designed to integrate

seamlessly with existing UR applications,

including protection functions, FlexLogic™,

metering and communications. The Multilin

HardFiber System offers the following benefits:

• Communicates using open standard

IEC 61850 messaging

• Drastically reduces P&C design,

installation and testing labor by

eliminating individual copper terminations

• Integrates with existing M60’s by

replacing traditional CT/VT inputs with

the IEC 61850 Process Bus module

• Does not introduce new cyber security concerns

Visit the HardFiber System product page

on the GE Digital Energy web site for more details.

Advanced Automation

The M60 incorporates advanced automation

features including powerful FlexLogic

programmable logic, communication, and

SCADA capabilities that far surpass what is

found in the average motor protection relay.

The M60 integrates seamlessly with other

UR relays for complete system protection,

including the adjacent motors, feeders and

other balance of plant protection.

FlexLogic

FlexLogic is the powerful UR-platform

programming logic engine that provides

the ability to create customized protection

and control schemes, minimizing the

need and associated costs of auxiliary

components and wiring. Using FlexLogic,

the M60 can be programmed to provide

the required tripping logic along with

custom scheme logic for motor breaker

control (including interlocking with internal

motor start supervision and synchrocheck),

interlocking schemes with adjacent

protections (for example, preventing

sympathetic tripping of healthy feeders),

and dynamic setting group changes.

Two-Speed Motor Protection

The two-speed motor protection feature

allows for the protection of motors that

can operate at two different speeds and

have different full load capacity levels at

each speed. This feature can be used on

motors that have two sets of windings

on each stator, where each set is used to

operate the motor at a different speed.

Underpower Protection

The underpower protection feature

provides for sensitive detection of a

loss of load condition.  The underpower

protection element can be more sensitive

for detecting loss of load conditions

caused by process-related problems than

is possible using a standard undercurrent

element.

Reduced Voltage Starting

The reduced voltage starting feature

provides the controls for signaling the

motor to switch over from a reduced

voltage (that is used during startup) to the

full voltage for motor running operation.

This feature can issue the command

to switch to full operating voltage, by

detecting: a) if the motor load has reached

a preset current level, or b) if a time delay

has elapsed (after starting), or c) both of

these conditions combined.

Under/Over Frequency Protection

The under/over frequency protection element detects when the motor is

operating at off-nominal frequencies (which can damage the process) or signals

to upstream protection or control to implement load-shedding actions.

RTD Protection (Module Option 5C)

The M60 RTD option provides 8 programmable RTD inputs per module that

are used for monitoring the stator, bearing and ambient temperatures. Each RTD input

has 2 operational levels: alarm and trip. The M60 supports RTD trip voting and provides

open RTD failure alarming. Alternatively, a remote RTD module “RRTD”, which

supports 12 RTD inputs, can also be used with the M60 for temperature monitoring.

The RRTD provides cost savings compared with standard RTD wiring.

Start Inhibit

The start inhibit function prevents the starting of a motor when the motor is too

hot and does not have a sufficient amount of thermal capacity available to allow a

start without being tripped offline.

Breaker Failure Protection

The breaker failure protection element monitors for timely operation of the

connected breaker. If a trip command is not successful in operating the breaker

and clearing the fault, the breaker failure element can be used to send trip signals to

upstream breakers to clear the fault.

Undercurrent Protection

The undercurrent protection element provides the ability to trip the motor due

to external conditions that can cause the load being pulled by the motor to drop

below a preset level.  This element is useful when the loss of the load results in a loss

of cooling which will cause the asset to overheat.

Under/Over Frequency Protection

The under/over frequency protection

element detects when the motor is

operating at off-nominal frequencies

(which can damage the process) or signals

to upstream protection or control to

implement load-shedding actions.

RTD Protection (Module Option 5C)

The M60 RTD option provides 8

programmable RTD inputs per module that

are used for monitoring the stator, bearing

and ambient temperatures. Each RTD input

has 2 operational levels: alarm and trip. The

M60 supports RTD trip voting and provides

open RTD failure alarming. Alternatively,

a remote RTD module “RRTD”, which

supports 12 RTD inputs, can also be used

with the M60 for temperature monitoring.

The RRTD provides cost savings compared

with standard RTD wiring.

Start Inhibit

The start inhibit function prevents the

starting of a motor when the motor is too

hot and does not have a sufficient amount

of thermal capacity available to allow a

start without being tripped offline.

Breaker Failure Protection

The breaker failure protection element

monitors for timely operation of the

connected breaker. If a trip command is

not successful in operating the breaker

and clearing the fault, the breaker failure

element can be used to send trip signals to

upstream breakers to clear the fault.

Undercurrent Protection

The undercurrent protection element

provides the ability to trip the motor due

to external conditions that can cause the

load being pulled by the motor to drop

below a preset level.  This element is useful

when the loss of the load results in a loss

of cooling which will cause the asset to

overheat.

Mechanical Jam

The mechanical jam element senses increased loading associated with

process or load related faults such as an overloaded conveyor. A programmable

delay setting can be used to allow theprocess to attempt to clear itself before

issuing a trip.

Acceleration Time

The M60 protects the motor from overheating in cases of abnormal

loading during motor starts. The motor can be tripped if the motor does not

reach a running condition within the programmable motor acceleration time.

Stator Differential

The M60 provides stator differential protection for fast clearing of stator phase

faults. Advanced CT saturation detection algorithms and dual-slope characteristics

are incorporated for increased security during heavy faults.

Short Circuit Protection

Short circuit overcurrent protection protects damage to the motor during a

locked rotor condition. The M60 comes with up to 8 instantaneous overcurrent

elements that can be configured for protection, alarming, and control during

locked rotor conditions.

Protection and Control

The M60 motor protection system offers

comprehensive protection and control

solutions for medium to large-sized

three-phase motors.  The M60 includes

advanced automation and communication

capabilities, extensive I/O options, and

powerful fault recording features that can

simplify postmortem fault analysis and

help minimize motor downtime. As part

of the Universal Relay (UR) family, the M60

provides superior protection and control

that includes:

Motor Thermal Model

The M60 features an enhanced motor

thermal model consisting of the following

elements:

• Thermal limit curves – NEMA standard,

voltage dependent and customized

• IEC 60255-8 thermal overload curves

• Current unbalance biasing

• Independent running and stopped

exponential cooling curves

• Optional RTD biasing of the thermal

model to adapt to real-time

temperature measurements

• Compensation for hot/cold motor

conditions

The M60 thermal model integrates both

stator and rotor heating and cooling into

a single model.

Overtemperature Protection

The M60 supports up to 16 programmable

RTD inputs that allow for the configuration

of the alarm and trip temperature of each

RTD, detecting RTD shorting conditions,

and selecting RTD voting that requires

more than one RTD to detect an over

temperature condition before it will issue a

trip command.

Motor Thermal Model

The M60 features an enhanced motor

thermal model consisting of the following

elements:

• Thermal limit curves – NEMA standard,

voltage dependent and customized

• IEC 60255-8 thermal overload curves

• Current unbalance biasing

• Independent running and stopped

exponential cooling curves

• Optional RTD biasing of the thermal

model to adapt to real-time

temperature measurements

• Compensation for hot/cold motor

conditions

The M60 thermal model integrates both

stator and rotor heating and cooling into

a single model.

FlexCurves™

For applications that require greater

flexibility, FlexCurves can be used to define

custom curve shapes. These curves can

be used to protect motors with different

rotor and stator damage curves, allowing

complete protection over the total motor

capacity.