Basics of Medium Voltage Motor ControlStarter Power Components & Starter Types

Larry Dalton – Lead Operation SpecialistJude Hernandez - Application EngineerGE – Industrial Solutions

Slide # 1, Rev 3, 11/8/16

GE Industrial Solutions has met the standards and

requirements of the Registered Continuing Education

Program. Credit earned on completion of this program

will be reported to RCEP at RCEP.net. A certificate of

completion will be issued to each participant. As such, it

does not include content that may be deemed or

construed to be an approval or endorsement by RCEP.

Note: To receive PDH credit, the participant must be

present during the live webinar session.

Slide # 2, Rev 3, 11/8/16

COPYRIGHT MATERIALS

This educational activity is protected by U.S. and International copyright laws.

Reproduction, distribution, display and use of the educational activity without

written permission of the presenter(s) is prohibited.

© GE Industrial Solutions 2016

Slide # 3, Rev 3, 11/8/16

Purpose and Learning Objectives

Purpose of activity:

This webinar will educate the participant in the various power components of a MV Class E2 motor controller and the different types of medium voltage motor starters.

Learning objectives:

At the end of this presentation you will be able to;

1. Understand and explain the differences between MV Class E2 Controllers (MCC) and MV MC Switchgear

2. Describe the basic power components of a MV Class E2 motor starter and their purposes.

3. Describe a few of the various types of MV Class E2 motor starters available.

Slide # 4, Rev 3, 11/8/16

__________

Notes:

1. This session is good for (1) PDH credit subject to receipt of a completed evaluation form. Refer to final slide.

2. This session is being delivered via the distance learning (live webinar) delivery method.

3. Content area: Health, Safety, & Welfare Including Core Technical.

4. Revision #3 dated: 11/8/16

• Standards: MV MCC vs. MV MC Swgr

• MV MCC; NEMA ICS-3 Part I and UL347

• MV Swgr; IEEE/ANSI C37.20.2 (metal-clad), 37.04, 37.06, 37.09, 37.010, 37.11, 37.100, and NEMA SG-

4 (optional UL)

• When Arc Resistant enclosures are required, the specifications for both equipment types should also

reference compliance to IEEE C37.20.7 and class of enclosure (with the most common enclosure Class

being Type 2B)

• Construction: MV MCC vs. MV MC Swgr

• MV MCCs have a grounded metal overall enclosure vs. MV MC Switchgear has the same grounded

metal overall enclosure, in addition to having the breaker, bus, and cable areas being compartmentalized

and isolated from each other by grounded metal barriers, with no intentional openings

• MV MCCs have Bare Bus as standard (optional insulated bus available) vs. MV MC Switchgear which

requires ALL bus and connections to be insulated

• MV MCCs can have a Stationary or Draw out switching device vs. MV MC Swgr where the breakers

MUST be drawout

• MV MCC D.O. contactors normally do not require shutters over primary stabs when isolated by an

isolation switch vs. MV MC Swgr which requires automatic shutters over the primary breaker stabs.

• MV MCCs are front access only, they do not require rear access (some possible exceptions) vs. MV MC

Swgr which requires rear access

• MV MCC sections are typically smaller (approx. 2-Hi dims. 36”W x 30”DP x 90”H) vs. MV MC Swgr

sections which are larger (approx. 2-HI dims. 36”W x 94”DP x 95”H)

• MV MCCs more cost effective vs. MV MC Swgr by a factor of approx. 2X

MV MCC vs. MV MC Switchgear

Slide # 5, Rev 3, 11/8/16

MV Contactor vs. MV Breaker

1 – *Note: when using a “Latched” contactor, there is no anti-pump feature like a MV

breaker, therefore a potential failure could occur if close/trip signals are given together.

2 – Deratings may apply depending on enclosure, configuration, ambient temp, altitude,

etc.

3 – Peak let-through current is the highest current flowing in the circuit following

inception of a fault (instantaneous value, not RMS) Slide # 6, Rev 3, 11/8/16

UL Class E2

Vacuum Contactor

with Fuses

Vacuum Circuit

Breaker

Functional

Characteristics

Electrically held

Mechanically latched -

remains closed on

loss of control

voltage1

Mechanically

latched - remains

closed on loss of

system voltage

Continuous

Current Rating 200, 400, 800A2 1200, 2000, 3000,

3500, 4000A

Switching

Capability

From very low to

approximately

10-15X continuous

rating

From very low

to full rated short-

circuit current

(e.g. 63KA)

Electrical

Endurance

Contactor up to

1,000,000

operations

Up to 100 full short-

circuit interruptions

Mechanical

Endurance2,000,000 +/- 5,000 to 10,000

Peak let-

through

Current3

Lower

(current-limiting

fuse clears fault in

< 1/2 cycle)

Higher

(Clears fault

in 3 or 5

cycles after trip

signal recieved)

Overcurrent

Protection

Coordinated with

MV power fuses

and an overload

device

Requires protective

relay(s)

Maintenance

RequirementsVery Low Medium - High

MV Motor Controller Components-1 Line Diagram-

11M

CPT

CT

3

GSCT

1

PT

• Isolation Switch

• Power Fuse

• Vacuum Contactor

• O/L Relay

• Instrument Transformers

(PTs, CPTs, CTs)

or

R (or E) Type

M

RTDs

Cntl Pwr

Vo

lt In

pu

t

orThermal

Overload

Slide # 7, Rev 3, 11/8/16

500HP

MV Motor Controller Components-Isolation Switch-

Quick-Make, Quick-Break, Non-Load Break, Isolation Switch

Safety device to isolate fuses/contactor from main bus

Manually-operated

Interlocks Prevent

• Operation when contactor closed (motor energized)

• Opening door when switch is closed (must be fully off)

• Accidental operation when HV door is open

11M

CPT

CT

3

GSCT

1

PT

or

R (or E) Type

M

RTDs

Cntl Pwr

Vo

lt In

pu

t

Thermal

Overloador

Slide # 8, Rev 3, 11/8/16

500HP

Open

Closed

MV Motor Controller Components-Isolation Switch-

Slide # 9, Rev 3, 11/8/16

MV Motor Controller Components-Fuses-

Type R fuses are used for motor applications and General

Purpose type E fuses are used for transformer/feeder

applications

MV E2 motor controllers use current-limiting back-up fuses

which provide the short-circuit protection for the motor and

motor controller

Fuses must be coordinated with the contactor and O/L relay

for proper MV E2 motor controller applications

The MV fuses must permit repetitive switching of the load while

taking into consideration the magnitude of inrush current and

associated time without damage to the fuse

Standard interrupting rating (S/C rating of equip) – 50KAIC

Bolt-on or Clip type fuses available

11M

CPT

CT

3

GSCT

1

PT

or

R (or E) Type

M

RTDs

Cntl Pwr

Vo

lt In

pu

t

orThermal

Overload

Slide # 10, Rev 3, 11/8/16

500HP

MV Motor Controller Components-Fuses -

Slide # 11, Rev 3, 11/8/16

MV Motor Controller Components-Contactor-

Vacuum contactor switching device

Stationary or Draw-out construction available

Standard Electrically (magnetic) held, or Optional mechanically

(latched) held available

Max Voltage: 2400V-7200V (higher voltage ratings may be

available and/or MV breakers may be used for applications

higher than 7200V)

200A, 400A, and 800A nominal ratings (deratings may apply

for enclosure type, configuration, altitude, ambient

temperature, etc.)

BIL: 60KV11M

CPT

CT

3

GSCT

1

PT

or

R (or E) Type

M

RTDs

Cntl Pwr

Vo

lt In

pu

t

orThermal

Overload

Slide # 12, Rev 3, 11/8/16

500HP

MV Motor Controller Components-Contactor-

Slide # 13, Rev 3, 11/8/16

MV Motor Controller Components-Instrument Transformers-

CTs: Standard Window type or optional Bar type phase CTs are

available. Optional window type GSCT available.

Standard CTs used in MV MCCs are normally single ratio and

have a relatively low Accuracy Class, e.g. C10 (window) or

T50 (bar). Multi-ratio and higher CT accuracy classes are

available, but may require additional sections or space, due to

size to accommodate mounting.

CPTs: Standard stationary mounted in starter compartments

are available from 500VA standard, up to 3KVA optional

PTs: Optional stationary mounted in starter compartments are

available in open-delta, or wye connected configurations, but

may require additional space to accommodate mounting.11M

CPT

CT

3

GSCT

1

PTs

or

R (or E) Type

M

Cntl Pwr

RTDs

Vo

lt In

pu

t

orThermal

Overload

Slide # 14, Rev 3, 11/8/16

500HP

MV Motor Controller Components-O/L Relay-

Many types/styles of O/L relays are available in MV E2

controllers for motor protection; from a basic 3 phase bi-

metallic block O/L Relay (Standard) to Digital Multifunction

Motor Protection Relays (Optional) and all required CT inputs

for operation.

Primarily for O/L protection for the load and up to the

switching/overload capability of the vacuum contactor

Must be coordinated with the contactor and fuse for proper MV

E2 controller protection/applications

Recommended/Suggested O/L relay protection functions for

MV motors: 49 – thermal overload

50/51 P/G – Inst. and Time O/C

49RTD (S)/38 – stator and/or bearing RTDs

51R – mechanical jam

46 – current unbalance

27/59 – under/over voltage

37 – undercurrent

87M – motor differential (large MV induction/synch motors > 1500HP)

86 – lockout

Communication and I/O

Others depending on type (ind/synch) and size of motor

11M

CPT

CT

3

GSCT

1

PT

or

R (or E) Type

M

Cntl Pwr

RTDs

Vo

lt In

pu

t

orThermal

Overload

Slide # 15, Rev 3, 11/8/16

500HP

NEMA Type Enclosures

• NEMA Type 1 (vented)

• NEMA Type 1 Gasketed (non-vented)

• NEMA Type 12 (non-vented)

• NEMA Type 3R Outdoor (non-vented)

• Non-walk-in

• Walk-in Protected Aisle

Slide # 16, Rev 3, 11/8/16

Basic Starter Types

• AC Induction Motors

• FVNR

• FVR

• 2S2W

• 2S1W

• RVNR (RVAT, RVPR, & MVSSSS)

• Transformer Feeders (Latched)

• Capacitor Banks

• Synchronous (Brush & Brushless)

• Other Types Available

Slide # 17, Rev 3, 11/8/16

Starter Type-FVNR Sq. Cage Induction-

Slide # 18, Rev 3, 11/8/16

Starter Type-FVNR Latched Contactor-

Slide # 19, Rev 3, 11/8/16

Basic Starter Types-Reduced Voltage-

*Motor current is proportional to starting voltage, and torque

is proportional to the square of the starting voltage

Slide # 20, Rev 3, 11/8/16

Starter Type-RVAT (Reduced Voltage Auto Transformer) Sq. Cage Induction-

Slide # 21, Rev 3, 11/8/16

-RVAT (cont’d)-

Slide # 22, Rev 3, 11/8/16

-RVAT (cont’d)-

Slide # 23, Rev 3, 11/8/16

Controls

MTR

Class E-2 Controller

Isolation vac.

contactor

Bypass vac.

contactor

Isolated cntl.

compartment

Fused isolation

disconnect

SCR stack

w/ I2t overload

Starter Type-MVSSSS (Medium Voltage Solid State Soft Start) Sq. Cage Induction-

Slide # 24, Rev 3, 11/8/16

Benefits of Soft Starts?

Eliminate torque shock damage

• Increases motor AND drive train reliability

Keep starting kVA to a minimum

• Maintain future flexibility

Soft Start and Soft Stop pumps

• Reduce hyd. / mech. problems

4x Cost ratio vs. MV VFDs

Slide # 25, Rev 3, 11/8/16

What Sets Soft Starts Apart

High performance protection

• Motor Protection Relay quality

Extreme flexibility

• Any kind of ramp profile

Heavy duty ratings

Rugged gate firing circuit

• Reliable, noise immune

Slide # 26, Rev 3, 11/8/16

MVSS Ratings

• 500% for 30-60 seconds

• 600% for 30+ seconds

– Capable of Class 30 “Mill Duty” motors

• 200% for up to 2 minutes

– Allows for long accel times

• Tested at 40˚C and 50˚C

Slide # 27, Rev 3, 11/8/16

Programmable I/O

120V inputs

• 2 wire or 3 wire control , external trip

1 Analog Tachometer Input

2ea 4-20ma analog outputs

• Programmable for RMS Current, % Motor Load, Bearing Temp, Stator Temp, or RPM

8 digital outputs

• Each can be assigned to alarms and/or trips

Slide # 28, Rev 3, 11/8/16

Metering

10 current based metering functions

6 status screens

Recorder for 60 events with time / date stamp

29 RTD option screens

Voltage monitoring functions

• Including Line Voltage. Frequency, PF, kW, kW Demand, kVAR, kVAR Demand, kWH, kVA, kVA Demand.

Slide # 29, Rev 3, 11/8/16

Communications

RS485 Modbus RTU built-in

Future options for DeviceNet, others

RS232 Windows based programming / monitor program

Slide # 30, Rev 3, 11/8/16

Starter Type-MVSSSS (Medium Voltage Solid State Soft Start) Sq. Cage Induction-

Slide # 31, Rev 3, 11/8/16

-MVSSSS cont’d-

Slide # 32, Rev 3, 11/8/16

Arc Resistant Motor Controller

Functionality

Arc Resistant MV motor control has the

same basic functionality as regular MV

motor control. This optional construction

feature offers additional protection

against internal arc faults as defined in

the ANSI Std. C37.20-7-2007 for Type

2B accessibility.

The Arc Resistant motor control center

is a more reliable and safer option to

typical applications in oil and gas, pulp

and paper, petrochemical, and in

general where it is used as an additional

solution for arc flash mitigation.

Slide # 33, Rev 3, 11/8/16

Product Visual Identity

Doors -

reinforced

latches &

hinges to

prevent gases

from escaping

Totally

enclosed non-

ventilated

welded

enclosure for

harsh

environments

Arc Duct

redirects

flash energy

away from

the operator

Pressure Arc

Relief Vent

Heavy Duty

reinforced side

panels

Same proven

internal

components

Welded LV

compartment

protects

operator with

door open

Slide # 34, Rev 3, 11/8/16

Summary

•MV Class E2 controllers/starters provide benefits such as high duty cycles, low

maintenance requirements, front accessibility, and more compact designs vs. MV

Metal-clad switchgear.

•Utilize the proper symbols on 1-Line diagrams to represent MV Class E2

starters/controllers, and if possible, separate specifications, or separate/distinct

sections in combined specifications, to differentiate/describe the different MV

equipment platforms (MCC or Switchgear) with respect to Standards, construction

features, etc.

•To help manufacturer’s quotation groups properly size a MV Motor

Starter/Controller, complete information (nameplate or data sheets) of the motor/load

should be provided in the RFQ documents (FLA, LRA, RPM, SF).

•If non-standard and/or additional components are required, e.g. bus diff CTs, High-

Accuracy or Multi-ratio CTs, draw out PTs/CPTs, etc., additional space, mounting

configurations, and/or sections may be required. Consultant manufacturer

representative(s) prior to doing equipment/building layouts.

•When speed control is not required, Reduce Voltage starters can be a solution to

limit the impact to the electrical and mechanical systems when starting and/or

stopping large motors. However, care must be taken to ensure proper design

coordination between the starter type and load requirements.

Slide # 35, Rev 3, 11/8/16

Thank you for your time!

This concludes the educational content of this

activity.

To request PDH credit for this webinar, please follow the directions in

the “thank you” email you will receive after completion of this

presentation. Please complete and return the course evaluation form

to the following email address: ceu.credit@ge.com

This webinar has been recorded and can be reviewed at the following

website noted below. Please allow ~ 5 working days for processing

before accessing the site.

http://www.geindustrial.com/technical-tuesdays-webinar

Slide # 36, Rev 3, 11/8/16