ABB SACE 1

MOTOR SWITCHING AND PROTECTION

IEC 947-4

ABB SACE 2

MOTOR DATA

• P = Rated motor power (kW)• V = Supply voltage (V)• cos = Power factor = efficency

P

In = ------------------------ = rated current

V x 1.73 x cos x

ABB SACE 3

MOTOR CURRENTS

• In = Rated nominal current • Ia = Rated starting current (8-10 x

In)

• Ip = Maximum peak inrush current (13 - 15 x In)

ABB SACE 4

MOTOR STARTING CURRENT

In

Ia

Ip

t (s)

I (A)

ABB SACE 5

MOTOR PROTECTION

1

2

3

ABB SACE 6

TIME - STARTING CURVES

• 1 MOTOR START UP

• 2 OVERLOAD PROTECTION (THERMAL)

• 3 SHORT CIRCUIT PROTECTION (MAGNETIC)

ABB SACE 7

DIAGRAM A

M

2 CONTACTOR (Switching device)

3 THERMAL OVERLOAD RELEASE

1 CIRCUIT BREAKER WITHMAGNETIC RELEASE

(Short circuit protecting device)

(Overload protection)

ABB SACE 8

DIAGRAM B

M

1 CIRCUIT BREAKER WITHELECTRONIC RELEASE

2 CONTACTOR

(Short circuit and overload protecting device)

(Switching device)

ABB SACE 9

DIAGRAM C

M

1 CIRCUIT BREAKER WITH ELECTRONIC RELEASE

(Short circuit and overload protecting device and switching device)

ABB SACE 10

DIAGRAM A

• High number of motor switcing• TOR on contactor• Most common application up to

now

ABB SACE 11

DIAGRAM B

• High number of motor switching• No TOR on contactor• PR212/MP electronic release• New and future application

ABB SACE 12

DIAGRAM C

• No contactor and TOR• Low number of motor switching• ACB with electronic release• Typical application for big motor

sizes (Power > 250 kW/400 V)

ABB SACE 13

PR 222MP

t5

t

I1

Class

L

I3I50.4 x In

4 sec

U

I

R

I

I: istantaneous adjustable short circuit

I3=6-7-8-9-10-11-12-13 x In

L: Inverse long delay overload

I1=0.4-1 x In step 0.01 x In

R: Locked rotor protection

I5=3-4-5-6-7-8-10 x In

t 5=1-4-7-10 sec.

U: Phase loss/unbalance

OFF or ON: 4 sec. Tripping time @

one phase current 0.4 times I1

ABB SACE 14

CLASS

starting class

according to IEC 947- 4

CLASS

starting class

according to IEC 947- 4

L Protection

against overloadL Protection

against overload

R Protection

against locked rotorR Protection

against locked rotor

I Protection

against short circuit

I Protection

against short circuit

U Protection

against phase loss/unbalance

U Protection

against phase loss/unbalance

PR 222MP

ABB SACE 15

TRIPPING CLASS

Tripping class from 10 A to 30 defines the time-current curves of the thermal overload release during starting and on duty service (overload and phase loss)

10 A - 10 - 20 - 30

ABB SACE 16

TRIPPING CLASS

10 - 10 A (Normal starting) Pump - Compressor10-20 (Normal starting) Ventilator

30 (Heavy duty) Mill

17

SHORT CIRCUIT TESTDuty cicle:

O - CO at “Iq” current

O : tripping of the circuit breakerunder short circuit condition

CO : Closing by contactor undershort circuit condition and tripping

of the breaker

Motor protection

ABB SACE 18

COORDINATION TYPE

Type 1

Damage to the contactor and/or thermal overload releaseis acceptable as two condition are fulfilled:- there is no risk to the operator;- no device other than contactors and/or overload releasecan be

replaced.

ABB SACE 19

COORDINATION TYPE

Type 2

The only risk permitted is light welding of the contactor, i,e. the contactor can easily be separated either by electrical control or using a screwdriver.

After the coordination test:- all the protection device functions must still be operational;- the manufacturer must prove that the contactor is still operational for further service.

ABB SACE 20

COORDINATION COMPARISON

Type 1

- - Lower investment cost

- Expansive maintenance

- Maintenance stop plant

ABB SACE 21

COORDINATION COMPARISON

Type 2

- Higher investment cost- Cheaper maintenance- Continuity of service

ABB SACE 22

STAR-DELTA STARTING

K 1 K 2 K 3

M

ABB SACE 23

COORDINATION TABLE SELECTION CHART

1 Coordination type 2 Starter

“1” or “2”Direct or Star-Delta

3 Starting type Normal or Heavy duty

MOTORPOWER(kW)

CIRCUIT BREAKER

CONTACTOR

TOR

Only magnetic

With PR222MP

Name Name

(N.A. for 222MP)or

4 Voltage level and short circuit current “Iq”

ABB SACE 24

ABB SACE 25

500 V 50 kA type “2” star delta

MCCB O/L relayRated Output

Rated Current

Line Delta Star

Pe Ie

[kW] [A]75 110 T4H250 MA125 A95 A95 A50 TA80DU8090 132 T4H250 MA160 A110 A110 A75 TA110DU90110 158 T4H250 MA200 A110 A110 A95 TA110DU110132 192 T4H250 PR221-I In250 A145 A145 A95 E200DU200160 230 T4H320 PR221-I In320 A145 A145 A110 E200DU200200 279 T5H400 PR221-I In400 A210 A210 A145 E320DU320250 335 T5H630 PR221-I In630 A210 A210 A185 E320DU320290 394 T5H630 PR221-I In630 A260 A260 A210 E320DU320315 440 T5H630 PR221-I In630 A300 A300 A210 E320DU320

TypeMotor

TypeContactor

ABB SACE 26

COORDINATION TABLES

ABB SACE 27

ACB MOTOR CORDINATION TABLE

D.O.L. STARTING

Power(kW)

In(A)

Op. Nr.(AC3)

ACB(Type)

Icu(kA)

Release(A)

Type CT(A)

Up to450

800 10000 E1B 40 1250 PR112 1250

Up to630

1140 12000 E2N 65 1600 PR112 1600

Up to630

1140 12000 ES3 75 1600 PR112 1600

Up to630

1140 12000 E3H 100 1600 PR112 1600

ABB SACE 28

Rated uninterrupted current, Iu [A] 160 250 250 400Rated service current, In 1…100 100…200 80…250 320, 400Poles 3 3 3 3Rated service voltage, Ue (AC) 50-60Hz [V] 690 690 690 690Rated impulse withstand voltage, Uimp [kV] 8 8 8 8Rated insulation voltage, Ui [V] 800 800 1000 1000Test voltage at industrial frequency 1 min. [V] 3000 3000 3500 3500

Rated ultimate short-circuit breaking capacity N S H L N S N S H L V N S H L VIcu AC 50-60 Hz 380/415 V [kA] 36 50 70 85 36 50 36 50 70 120 200 36 50 70 120 200

Rated service short-circuit breaking capacityIcs AC 50-60 Hz 380/415 V [kA] 36 50 70 70 27 27 36 50 70 120 200 36 50 70 120 200

Rated service short-circuit breaking capacityIcm AC 50-60 Hz 380/415 V [kA] 75,6 105 154 187 75,6 105 75,6 105 154 264 440 75,6 105 154 264 440

Isolation behaviour

Reference Standards IEC 60947-2 IEC 60947-2IEC 60947-2

IEC 60947-4-1 (with PR222MP)IEC 60947-2

IEC 60947-4-1 (with PR222MP)

Protection against short-circuitMagnetic only release MA (1) Electronic release PR221DS-I

Integrated protectionElectronic release PR222MP

Mechanical life 25000 25000 20000 20000Electrical life @ 415 V AC 8000 8000 10000 7000

Fixed dimensionsW 3p 90 105 105 140D 70 70 103,5 103,5H 130 150 205 205

(1) MF up to In=12,5A

T2 T3 T4 T5

ABB SACE 29

ACB with microprocessor based motor protection

release PR 112/113

B - N - S - H

40 - 65 - 75 - 100 kA @ 400 V

800 -1250 - 1600 A

Release range:

From R800 A

EMAX E1-E2-E3

to R1600 A

ABB SACE 30

AND NOW… MOTOR IS READY TO

START !