ABB HD4/R, Installation And Operating Instructions Manual

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Carry out the following operations before putting the circuit-
breaker into service: 
–   make sure that the power connections to the circuit-break-

er terminals are tight; 

–   establish the setting of the primary electronic overcurrent 

release (if provided); 

–   make sure that the value of the power supply voltage of the 

auxiliary circuits is between 85% and 110% of the rated 
voltage of the electrical applications; 

–   make sure that there are no foreign bodies, such as bits of 

packing, in the moving parts; 

–   to  avoid  overtemperatures,  make  sure  that  there  is  a  suf-

ficient exchange of air in the place of installation; 

–   also perform the inspections indicated in the following ta-

ble:

8. Putting into service 

  All the operations for putting into service 

must be carried out by ABB personnel or by 
the customer’s qualified personnel.

If the operations are obstructed in any way, 
do not force the mechanical interlocks and 
check that the operating sequence is correct. 

The operating forces which can be applied 
are indicated in paragraph 6.3.

Discharge the closing springs (close and 
open the circuit-breaker) to access the inside 
of the operating mechanism.

Disconnect the PR521 release (if provided) 
before conducting insulation tests on the 
circuit-breaker.

8.1  General procedures 

Subject of the inspection 

Procedure

Positive check

1

Insulation resistance.

Medium voltage circuit

Using a 2500 V Megger, measure the insulation 
resistance between the phases and between 
phases and earth the circuit.

The insulation resistance should be at least 50 M

Ω

and must remain constant over time.

Auxiliary circuits

Using a 500 V Megger (installed equipment 
permitting), measure the insulation resistance 
between the auxiliary circuits and the earth.

The insulation resistance should be several M

Ω

 and 

must remain constant over time.

2

Auxiliary circuits.

Make sure that the connections to the control 
circuit are correct: proceed with the relative power 
supply.

Normal operations and signals.

3

Manual operating mechanism.

Perform a few closing and opening operations (see 
chap. 6).

NOTE.

 Power the undervoltage release and the 

locking magnet on the operating mechanism at the 
relative rated voltage (if provided).

The operations and relative signals occur correctly.

4

Motor operator (if provided)

Power the spring loading gearmotor at the relative 
rated voltage.

The springs are loaded correctly.
The signals are correct.
The gearmotor stops when the springs have been 
loaded.

Perform a few closing and opening operations.

NOTE.

 Power the undervoltage release and the 

locking magnet on the operating mechanism at the 
relative rated voltage (if provided).

The gearmotor reloads the springs after each 
closing operation.

5

Undervoltage release (if provided).

Power the undervoltage release at the relative rated 
voltage and perform the circuit-breaker closing 
operation.

The circuit-breaker closes correctly.
The signals are correct.

Disconnect the power supply to the release.

The circuit-breaker opens.
The signal changes over.

6

Opening release.

Close the circuit-breaker.
Power the shunt opening release at the relative 
rated voltage.

The circuit-breaker opens correctly.
The signals are correct.

7

Shunt closing release (if provided).

Open the circuit-breaker. Power the shunt closing 
release at the relative rated voltage.

The circuit-breaker closes correctly.
The signals are correct.

8

Key lock.

Open the circuit-breaker. 
Turn the key and remove it.
Attempt the circuit-breaker closing operation.

Neither manual nor electric closing takes place.

Insert the key again and turn it through 90°.
Perform the closing operation.

Both electric and manual closing take place 
correctly; in this position the key cannot be 
removed.

9

Auxiliary contacts in the operating 
mechanism

Insert the auxiliary contacts into suitable signalling 
circuits.
Perform a few closing and opening operations.

The signals occur correctly.