Motor Protection- ABB

7/21/2019 Motor Protection- ABB

1/27

ABB

| Slide 1

Motor Protection

Type 2 Co-ordination

Heikki Autio Breakers & Switches


2/27

ABB

| Slide 2

Main electrical parameters of motors

Basics of fuse links

Main solutions for switcin! and protection of motors

Main standard prescriptions for coordination metods

S"C Selected "ptimi#ed Coordination

Summary

Pro!ram


3/27

ABB

| Slide $

Motor data: Rated parameters

P % &ated motor power 'k()

* % Supply +olta!e '*)

cos % Power factor

% ,fficiency

e % &ated current 'A)


V

PIe

=

3cos


4/27

ABB

| Slide .

Motor data: Starting parameters

n accordance to te ,C /0. - . - 1 standard te startin! current is defined as3

a% 42 5 e

(it reference to te caracteristics of te most commonmotors is !i+en a +alue for te typical ma5imum initialstartin! current defined as3

p % 12 5 e



5/27


6/27

ABB

| Slide /

In order to realize the motor coordination, these kinds o de!ices are usuall" used:

#use$short%circuit protection

'ontactor $operation c"cles%switching

()ternal thermal*electronic release $o!erload protection

Switcin! and protection of motors


7/27

ABB

| Slide

;use link

;use link 7known as fuse8 is protection de+ice tat protects electrical circuit

a!ainst o+ercurrent and sort-circuit current

;use link pro+ides superior current limitin! properties

"ptimal solution for motor protection


8/27

ABB

| Slide switc off operations of te

motor under normal conditions and also to disconnect te motor from te supply

network in case of o+er currents detected :y te o+erload relay wic commands

te trippin!4

Besides? te contactor sall :e cosen so as to :e suita:le to carry te rated

current of te motor wit reference to te cate!ory AC-$4

Te contactor carryin! out motor operations allows to reali#e a num:er ofoperations muc i!er tan tose wic te switc could perform4


10/27

ABB

| Slide 10

"+erload relay

t is te de+ice intended toreali#e te protection a!ainst

motor o+erload and it as

usually te function of

commandin! te openin! of

te contactor for tose o+er

currents lower tan teoperatin! currents of te fuse

link


11/27

ABB

| Slide 11

Motor startin! current

IeIa=7.2xIe

I [A]

t [s]

Overload

protection

Motor starting

current

(it reference to te time current cur+e of te fuse link and te termal protection must :epossi:le to reali#e a solution wit te caracteristics !i+en in te picture3 te startin! current

of te motor is always under te trippin! cur+e of te protection de+ices in order to permit te

starter of te motor

Ip=12xIe

Time current

characteristic o

the use lin!


12/27

ABB

| Slide 12

+- $direct%on%line starting is peraps te most traditional system and consists in

connectin! te motor directly to te supply network? tus carryin! out startin! at full

+olta!e4 Tis re@uires a :i! inrus current and de+elops a i! startin! tor@ue wit +eryreduced acceleration times4 t !enerates +iolent accelerations wic stress te

transmission components suc as :elts and oints4

Star%delta $starting is te :est known system and may:e te most common startin!

system at reduced +olta!e it is used to start te motor reducin! te mecanical stresses

and limitin! te current +alues durin! startin! on te oter and? it makes a+aila:le areduced inrus tor@ue4

Te motor starts wit te windin! in te connection,te current a:sor:ed :y te motor is

reduced :y $ times in comparison wit its rated current4 (en


13/27

ABB

| Slide 1$

.he most common used circuits o starters are:Starter supply ith !ull "oltage starter (#irect online)

Starter initially supply ith a partial "oltage and current "alue starter(Star$#elta)

Star-Eelta Starter >dia!ramEirect on Fine Starter E"F dia!ram

Main solution for switcin! and protection of motors

Switc

;use

Fine

Contactor

"+erload

&elay

Switc

;use

Contactor

Contactor

Contactor

"+erload&elay


14/27

ABB

| Slide 1.

Te Standard reference for motor starters is ,C /0.-.-14 Tis Standard

!i+es also te definitions for te classification of motor starters4

Starter t"pe

Type 1% Eama!es to te contactor and to te o+erload relay are accepta:le4Te starters may :e inoperati+e after eac operation4 Terefore te starter

sall :e inspected and te contactor and>or te o+erload relay4 Tere sall not

:e dama!es for te users4

Type 2 % =o dama!es to te o+erload relay or oter parts a+e occurrede5cept tat weldin! of contactor or starter contacts is permitted? if tey are

easily separated witout si!nificant deformation4 "nly fuse needs to :e

can!ed

'omparison

Type 1initial economic ad+anta!e - e5pensi+e maintenance - stops on te

plant due to faults4

Type 2initial i! in+estment - ser+ice continuity - easy

maintenance4

Cootrdination types


15/27


16/27

ABB

| Slide 1/ABB SAC,

Sort circuit test modality

I0 : #ull short circuit current

r: critical short circuit current

7Eependin! from contactor si#e8

7Ma5imum sort circuit current

admitted:yte com:ination8

$3 % 4 % 5 % 36 kA


17/27

ABB

| Slide 20

Solutions wit oter sort circuit protectin! de+ice

Solution with sot starters

As a control component of te motor? tis de+ice :ases its

functionin! on power semiconductors? also called tyristors?

wic allow to control and slowly increase te +olta!e

applied to te motor? makin! it start slowly and limitin! te

startin! currents4 "nce te ramp time as elapsed? te tyristors are usually

:y-passed wit a contactor? and te line is directly

connected to te motor4

Tis means tat tyristors do not remain constantly in

function? tus reducin! any possi:le pro:lem due totemperature-rise4


18/27

ABB

| Slide 21

Solutions wit oter sort circuit protectin! de+ice


19/27

ABB

| Slide 22

Selected "ptimi#ed Coordination 7S"C8http://applications.it.abb.com/SOC/Page/Selection.aspx

http://bit.do/motorprotection


20/27

ABB

| Slide 2$

Gow to use Selected "ptimi#ed Coordination userinterface 7S"C8

(it a few mouse click it is possi:le to searc for and

select coordination ta:le7s8 most appropriate for te current

purpose

;ollowin! filters are a+aila:le

Protection Ee+ice

&ated *olta!e

Sort-Circuit current 7@ current8

Coordination Type

"+erload &elay

Motor &ated Power


21/27

ABB

| Slide 2.


ou can select more tan one filter at te time


22/27

ABB

| Slide 26

http://bit.do/motorprotectionhttp://applications.it.abb.com/SOC/Page/Selection.aspxhttp://applications.it.abb.com/SOC/Page/Selection.aspx


23/27

ABB

| Slide 2/


,ac result links to te wole coordination ta:le


24/27

ABB

| Slide 2



25/27

ABB

| Slide 2

Motor Protection- ABB

Documents