10
MV input side
To load output side
2.5 Apparatus operating instructions
DS1 capacitor switches ensure a minimum
degree of protection (IP2X) if installed in the
following conditions:
–
fixed version, with protective netting.
Under these conditions, the operator is protected against ac-
cidental contact with moving parts.
Take care of moving parts if mechanical operations are per-
formed on the apparatus with the protective netting removed.
After the mechanical and movement operations have been
completed, remember to remove the protection net before en-
ergizing the MV bus bars.
If the operations are obstructed, do not force the mechanical
interlocks but check that the operation sequence is correct (re-
fer to the Installation Guidelines section).
2.6 Description of the capacitor-switch
closing and opening operations
The apparatus can only be operated electrically. Manual opera-
tion is NOT allowed.
A new capacitor switch concept has been developed by com-
bining of a mechanical contact system and diodes. The me-
chanical contact system is operated by a servomotor con-
trolled by a drive unit. The pole switch is illustrated in Figure
2, which shows the cross section of a power part and relative
kinematic chain.
IMPORTANT
The Input and Load (output) sides must not
be inverted.
DS1 must not be assembled upside down.
Note
:
The illustration is indi-
cative and not binding.
We reserve the right to
make changes without
notice in the course of
technical development
of the product.
Figure 6. Section of DS1 power part
By turning the drive shaft through approx. 140 degrees, the
power contacts will change from the closed to the open state
while the reverse movement will close them again.
The purpose of the device is to connect and disconnect the
capacitor bank in conjunction with a precise motion profile and
reliable synchronization.
Transitory commutation is performed by power diodes without
an arc during opening and inrush during closing.
Figure 7. Internal layout of DS1
1. Independent servo motors
2. Control unit for each phase:
a. Synchroniation
b. Actuation
c. System diagnostics
d. Micro Motion Control
3. Dry air pressure sensor
4. Operation capacitor
5. Power supply unit
Note: The illustration is indicative and not binding.
We reserve the right to make changes without notice in the course of
technical development of the product.
A specific real-time control completes the three-phase system.
The system is fully integrated inside the DS1 and complete di-
agnostics of the three-phase system application has been de-
veloped.
5
3
1
2
4
Provided
by
Northeast
Power
Systems,
Inc.
(NEPSI)
