3- instruction dm1a-1.ppt

Instruction for using DM1A

Schneider Electric 2- Services Division – Training SM6 Cubicle – July 2011

● Chapter 2 : Instruction DM1A


General descriptionDM1 circuit breaker cubicle

1. Top busbar compartment2. LV compartment3. Switchgear compartment: feeder

disconnector4. Operating mechanism compartment5. Cable connection or lower busbar

compartment

A. Earth bar connection pad

B. Top busbar connection padsC. Inspection windows

D. SF1 type MV Circuit Breaker

E. Front panel


General descriptionDM1A Version (cable incoming or outgoing)(front panel removed)

F. Voltage indicator

G. Voltage transformers

H. Current transformer

K. Load-side earthing switch

L. Capasitive voltage diveders

M. CB control panel

N. Insulating shields


Handling instructionsCubicle identification

A. Indicator plate

B. Characteristics and designation

C. Manufacturer’s name plate

NB:The characteristics of the CB are given on its plate

Serial number

D1: riveted to the front plate of the operating mechanism

D2: glued to the back of the front plate of the LV compartment

D3: glued to the upright of the frame


Handling instructionCaution

Do not handle the cubicle from the front control panel.


Handling instructionDimensions

In mm.


Installation instructionLayout in the substation

Switchboard installed to the right of a wall *(minimum clearance for trouble-operation)

Switchboard installed to the left of a wall


Installation instructionFitting busbars after installing the cubicles

Mount the 3 U – fittings on the suppporting insulators…

…using M8x30 bolts (female hexagonal) without locking

Mounting of U - fittings

Single - hole U - fitting


Installation instructionFitting busbars after installing the cubicles

Mount the 3 U – fittings on the heart of the unit…

…using M8x30 bolts (female hexagonal) without locking

Mounting of U - fittings

Two - hole U - fitting


Installation instructionFitting of bars

Place the bars as shown in the diagram opposite



Version < = 12kV

Identical for single – hole U - fittings

Fit the bars and then the nuts and bolts

Tightening torque: 28 Nm

Lock the bolts V for fixing U-fittings after all fitted

Tightening torque: 28 Nm



Version > 12kV

Identical for single – hole U – fittings

Note: fitting is identical for single-hole or two-hole U fittings

Place the field distributors correctly on the U-fitting

(use fool proofing device to ensure correct placing)

Incorrect fitting

Fit bars and then nus and bolts

Tightening torque: 28Nm

Lock the bolts V for fixing the U-fittings after all the bars have been fitted

Tightening torque: 28Nm


Installation instructionTop busbar of a DM1A


Installation instructionFittting the earth bars

Connect the earth bars together (using HM 8x30 bolts)

Earth the substation frames in either of these two ways


Start-up & operating instructionsChecks before energising

Check that nothing has been left in the connection compartment.

Put the front panel back in place


Start-up & operating instructionsVoltage indicators

Incoming cubicle:

As soon as the load side of the insallation is energised, the voltage indicator lamps should go on

Outgoing panel:

After the feeder disconnector and then the CB have been set to the closed position, the voltage indicator lamps should go on


Start-up & operating instructionsPhase concordance test

If the phases concord, the lamp remains off.If the phases do no concord, the lamp goes on.


Start-up & operating instructionsFeeder disconnector operating lever positions

Position the lever as indicated for downward (opening) operations.

Position the lever as indicated for upward (closing) operations.


Start-up & operating instructionsCB no-load Operations

1. Lock the lever insertion point E of the feeder disconnector with the key inserted at point B.

2. Remove the key from B then insert it at point C.

Unlock then charge the CB

3. Press the CB by pressingpush button I

4. Open CB by pressing pushbotton O.

Initial status:

The feeder disconnector is in open or earth position. CB locked in open position.


Start-up & operating instructionsCB no-load Operation

5. Lock CB open with key in C position by pressing the pushbutton O.

6. Remove the key from C position and insert it in B. Unlock the opening of lever E of the feeder disconnector.


Start-up & operating instructionsEnergizing the load side of the installation

Initial status:

The feeder disconnector is in earth. CB is locked open position. Front panel in place.

1. Set the feeder disconnector to open position using the operating lever.Note: in the case of a DM1A, the load earthing switch opens simultaneously.

3. Remove key from A,place in C and unlock the CB. Charge the CB (see CB instructions).

2. Set the feeder disconnector to closed position, then lock lever insertion point E of feeder disconnector with key to A.

4. Close CB by pressing pushbutton I. The load side of the installation is energized.


Start-up & operating instructionsDe-energizing the load side of the installation

Initial status:

The feeder disconnector is in closed position. CB is closed.

1. Open CBby pressing pushbutton O.

2. Lock the CB open with key in C by pressing pushbutton O.

3. Remove key from C & insert it in A. Unlock lever insertion point E of feeder disconnector.

4. Set feeder disconnector to open position.


Start-up & operating instructionsDe-energizing the load side of the installation

5. Set feeder disconnector to earthed position. The front panel can be removed.Note: in the case of a DM1A, the load earthing switch closes simultaneously.


Start-up & operating instructionsOperating safety

Operation is impossible when CB is closed.

The front panel can not be removed or installed unless the feeder disconnector is in earth position.

If the feeder disconnector is in open or closed position, the front panel can not be removed.

If the front panel is removed, the feeder disconnector can be set to open position. However it can not be set to closed position.


Start-up & operating instructionsPadlocking

With one to three 8 mm padlocks per locking point.

1. Padlocking feeder disconnector in earth position.

2. Padlocking feeder disconnector in open position.

3. Padlocking feeder disconnector in closed position.

4. Padlocking of the front panel.

(1 padlock only)


Maintenance instructionPreventive maintenance

• Never lubricate the operating mechanism.

• No particular maintenance is required under normal operating conditions.


Maintenance instructionCorrective maintenance

Replacing a voltage indicator block:

Pull out the voltage indicator block. (The switchboard can remain energized).


Maintenance instructionTroubleshooting chart

● Voltage indicator not illuminated. ● Check the voltage indicator block.

● Check that the feeder disconnector & the CB are closed.

● Check that the incoming cables are live.

● Front panel can’t be opened or closed.

● Check that the feeder indicator is in earth position.

● Feeder disconnector can’t be set to earth position.

● Check that the feeder disconnector is in open position.

● Feeder disconnector can’t be set to closed position.

● CB can’t be operated

● Check that the feeder disconnector is in open position.

● See CB instructions.


End of presentation

3- instruction dm1a-1.ppt

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