ABB REG316 4 Series - Adaptation of the Scheme in the Case of Shaft Filters; Commissioning; Connection to Excitation Systems with Shaft-Mounted Diodes; Pre-Commissioning Checks

ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. B
4-16
4.2.3.4.4. Connection to excitation systems with shaft-mounted diodes
Schemes for protecting excitation circuits with diodes mounted
on the shaft of the generator (rotating diodes) must have a con-
nection via a slip-ring to just one pole of the rotor circuit.
The two coupling capacitors C
K1
and C
K2
must thus be con-
nected in parallel to either the positive or negative pole. Where
there is a choice (several slip-rings), the connection of C
K1/2
to
the minus pole is to be preferred.
The remaining connections must be in accordance with Fig. 4.8
or Fig. 4.9.
4.2.3.4.5. Adaptation of the scheme in the case of shaft filters
If the rotor circuit includes a so-called shaft filter to prevent dam-
age to the bearings, the filter reduces the sensitivity of the pro-
tection.
In such cases, the sensitivity can be restored to the desired level
by increasing the value of R9 in the ancillary unit Type YWX111-
11/-21.
YWX111-11/-21
· Standard: R 9 = 120 W
(normal sensitivity)
· With shaft filter: R 9 = 1 kW
(increased sensitivity)
Location of resistor R9: see Fig. 4.11.
4.2.3.5. Commissioning
The commissioning procedure is described in Sections 4.2.3.5.1.
to 4.2.3.5.4. The tripping circuits of the REG 316*4 should be
interrupted while performing the tests according to Sections
4.2.3.5.3. and 4.2.3.5.4.
4.2.3.5.1. Pre-commissioning checks
· Check the wiring according to Section 4.2.3.4.
· Check that the YWX111-11/-21 is connected to the correct
auxiliary supply voltage of 100 V AC or 220 V AC.
Check that the shaft grounding brush of the generator makes
proper contact and is in good working order.