23
Emran Hossain FSE, R3-Bogra +8801678702640 Emran Hossain 1 5/18/2016

What Is Magnetic Contactor

Embed Size (px)

Citation preview

Page 1: What Is Magnetic Contactor

Emran Hossain

FSE, R3-Bogra

+8801678702640

Emran Hossain 15/18/2016

Page 2: What Is Magnetic Contactor

Magnetic Contactor

Gives Contact by Magnetic action

Emran Hossain 25/18/2016

Page 3: What Is Magnetic Contactor

Upper Part

Lower Part

Separator spring

Coil

Emran Hossain 35/18/2016

Page 4: What Is Magnetic Contactor

Emran Hossain 45/18/2016

Page 5: What Is Magnetic Contactor

Coil Power 220V AC Single phase Input three Phase LineOutput three Phase Line

Emran Hossain 55/18/2016

Page 6: What Is Magnetic Contactor

Line InLine Out

Path is open and we cannot get any output

from here.

If we give 220V in this coil then it will convert the lower part to a electro magnet. When it become a magnet, it will attract the upper part. Upper part will come down and the

circuit will be closed

Now what to do… ?

Emran Hossain 65/18/2016

Page 7: What Is Magnetic Contactor

Line InLine Out Line InLine Out

Coil Not Energized Coil Energized

Before After

Open PathClosed Path

Emran Hossain 75/18/2016

Page 8: What Is Magnetic Contactor

Basic is over

Time to learn something extraordinary….

Emran Hossain 85/18/2016

Page 9: What Is Magnetic Contactor

CP (MC-1) (MC-2) Genset

PDB DG

ATS

Condition-1: PDB on, DG off =MC-1 will pass PDB.

Condition-2: PDB off, DG on =MC-2 will pass DG power.

Condition-3: PDB off, DG on and in the mean time PDB become active = Both MC

will be on and….

Coil Coil

Emran Hossain 95/18/2016

CP sensing for DG. Can be given from anywhere like PIB, MDB or Input of CP MC

Page 10: What Is Magnetic Contactor

Auxiliary Contactor

Without Auxiliary contactor

With Auxiliary contactor

Emran Hossain 105/18/2016

Page 11: What Is Magnetic Contactor

Below condition is for NC (normally closed) Auxiliary….

When MC not energized When MC energized

Closed Path Open Path

Auxiliary also have a mechanical switch which is

attached with the upper part of the MC. When the upper path of the MC attracted by the lower path, status of the auxiliary also changed to NO

from NC and vice versa.

Emran Hossain 115/18/2016

Page 12: What Is Magnetic Contactor

CP (MC-1) (MC-2) Genset

PDB DGDG

CP

DG= DG controller port. Gives AC phase voltage

CP= DG controller port. Gives DG voltage

A1 A2A2= Auxiliary 2 (NC)

A1= Auxiliary 1 (NC)

Condition 1-PDB : CP will provide CP phase voltage, A2 auxiliary is NC so voltage directly sent to the coil of MC-1 and PDB will pass. In this condition If DG started by any cause then A1 is NO in this moment so the coil of MC-2

cannot get 220V. So when MC-1 is on at that time MC-2 is locked.

Condition 2-DG : DG will provide Genset voltage, A1 auxiliary is NC so voltage directly sent to the coil of MC-2

and DG voltage will pass. In this condition If CP comes then A2 is NO in this moment so the coil of MC-1 cannot get 220V. So when MC-2 is on at that time MC-1 is locked.

Coil Coil

Emran Hossain 125/18/2016

CP sensing for DG. Can be given from anywhere like PIB, MDB or Input of CP MC

Page 13: What Is Magnetic Contactor

Emran Hossain 135/18/2016

ATS-1

ATS-2

In maximum site there is no dual port VDTC. Normally we used to keep one DG locked.

ATS-2 will take output of ATS-1 as CP

Condition-1 PDB: Auxiliary A2 at ATS-1 is NC so MC-1 will turned on and pass CP to ATS-2. Again A2 at ATS-2 is NC so MC-3 will pass power.

In this condition MC-2 & MC-4 will be locked this is because A1 in both ATS will be turned to NO.

Condition-2 DG-1: Auxiliary A1 @ ATS-1 is NC so MC-2 will turned on and pass CP to ATS-2. Again A1@ ATS-2 is NC so MC-4 will pass power.

In this condition MC-1 & MC-3 will be locked this is because A2 in both ATS will be turned to NO.

Condition-3 DG-2: As CP unavailable and DG-1 locked so ATS-2 will get no input from ATS-1. DG-2 started. A1 auxiliary is NC so it will pass DG

voltage to the coil of MC-4 & MC-4 will pass the DG voltage.

Page 14: What Is Magnetic Contactor

Emran Hossain 145/18/2016

Problem…?

If any of the MC become faulty then total automation system will fail…

ATS-1

ATS-2

Page 15: What Is Magnetic Contactor

Emran Hossain 155/18/2016

CP (MC-1) (MC-2) Genset

PDB DG-1DG

CP

A1A3

DG-2DG

CP

(MC-3) Genset

A5

A6A4A2

Solution

Page 16: What Is Magnetic Contactor

5/18/2016 Emran Hossain 16

Condition-1 (DG-1 & 2 locked) PDB: Auxiliary A5 & A4 is NC MC-1 will turn on and pass CP. Then A1 & A2 will be NO, by this MC-2 & MC-

3 will be locked.

Condition-2 (DG-2 & PDB locked) DG-1: Auxiliary A1 & A6 is NC MC-2 will turn on.

Then A3 & A4 will be NO, by this MC-1 & MC-3 will be locked.

Condition-3 (DG-1 & PDB locked) DG-2: Auxiliary A3 & A2 is NC MC-3 will turn on.

Then A5 & A6 will be NO, by this MC-1 & MC-2 will be locked.

CP sensing for DG

Page 17: What Is Magnetic Contactor

5/18/2016 Emran Hossain 17

Problem…?

At the time of switching DG MC off and in the same time PDB MC on, very often it has been found that the DG alternator burns. This is because

sometimes for a very few second both MC keep on and CP voltage pass to the DG alternator. This phenomena happens for a very few second or mili second

for some internal delay of MC but this is enough to burn to alternator. So Solution is Ahead…..

Page 18: What Is Magnetic Contactor

5/18/2016 Emran Hossain 18

AC Timer

Top ViewSide View

It is a relay with two switch. It used to operate with time. Time can be set by regulating the top nobes. Time could

be sec, minute and hour.

Its source port is 2&7. Normally its 1+4 & 8+5 is closed. When it energies in

source port with (220V AC) then 1+3 & 8+6 become closed.

Page 19: What Is Magnetic Contactor

5/18/2016 Emran Hossain 19

CP (MC-1) DG (MC-2)

DG Auto port

(Regular controller)

Timer-1 (PDB) 30 Sec Timer-2 (Auto) 5 Sec Timer-3 (DG) 30 Sec

6 5 4 3 6 5 4 3 6 5 4 3

7 8 1 2 7 8 1 2 7 8 1 2

Battery (-)

A1 A2

VDTC

Page 20: What Is Magnetic Contactor

5/18/2016 Emran Hossain 20

Condition-1 PDB: When PDB come to the lower part of MC-1 then timer-1&2 turned on. Now 3 things will happen. 1: After 5s Timer-2 will turn off Timer-3 and MC-2 will release & auxiliary A2 will be NC. 2: After 5s of CP arrival (-12v) will be supplied to DG auto port and DG will be shuted down. 3: After 30s Timer-1 will pass 220v to the MC-1 coil by auxiliary A2 (Now A2 is NC). Until CP fail DG will not start or if DG manually started then it power will not pass, because Timer-3 is off so coil of MC-2 will get no

power.

Considering all the lower part as input and DG will start when there is no (-)V in auto port

Condition-2 DG: When CP fails MC-1 will release, A1 will be NC, Timer-1 & Timer-2 will turn off. Then In Timer-2 8+5 & 1+4 will be closed. DG auto port will not get (-)v and it will start if VDTC allow (will allow when site battery voltage is low). After starting Timer-3

will get 220v in its source port and turn on. After 30s it will pass 220v to the coil of MC-2 by A1 (Now A1 is NC). MC-2 will pass DG

power and MC-1 will be locked until DG stops.

Every Timer have some delay to deliver voltage. In this delay time MC’s will perform ON/OFF and our problem resolved.

Page 21: What Is Magnetic Contactor

5/18/2016 Emran Hossain 21

CP (MC-1) DG (MC-2)DG Auto port

(GCS409)

Timer-1 (PDB) 30 Sec Timer-2 (Auto) 5 Sec Timer-3 (DG) 30 Sec

6 5 4 3 6 5 4 3 6 5 4 3

7 8 1 2 7 8 1 2 7 8 1 2

Battery (-)

A1 A2

Start Stop

Battery (+)

VDTC

Battery (+)

Page 22: What Is Magnetic Contactor

5/18/2016 Emran Hossain 22

GCS409 controller have two auto port “Remote Start” & “Remote Stop”. Both works with (+12v).

DG will start with (+12V) in start point and will stop with (+12v) at stop point. But we cannot keep (+v) at stop point

continuously. We have to cut off immediately.

When CP will fail +12v will come to VDTC from Timer-1. When site battery voltage will be low VDTC will send +12v

to start point. And DG will start.

Timer-4 is a DC Timer. It works with DC voltage. Positive part of the DC voltage comes directly from DG battery.

And -12v comes from Timer-2. This voltage available only when CP is available. Whenever CP comes Timer-4 turns

on. And it will supply +12v to stop port until the delay time (10s) is over.

Page 23: What Is Magnetic Contactor

5/18/2016 Emran Hossain 23

?+8801678702640