ABB GridShield 3P, Installation, Operation And Maintenance Manual, Page: 32 / 40

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G R I DS H I E LD
®
3 P/3 S P R ECLOS E R
9.1 Pole replacement
To help ensure easy replacement of vacuum
interrupters or embedded current transformers,
the pole assembly is specifically designed as a
complete unit. It consists of the molded pole and
actuator component, which can be directly installed
as a replacement. For detailed instructions on the
complete pole replacement procedure, please
reach out to ABB technical support.
—
38 Actuator circuit
board assembly
—
39 Jumper setting
for 600:1 ratio
—
40 Jumper setting
for 300:1 ratio
—
38 —
39 —
40
9.2 Changing the CT ratio
The CT ratio in all GridShield
®
reclosers is initially
set to 600:1 by default. However, in the embedded
dual voltage sensing recloser, there is an option to
choose a 300:1 ratio. During the ordering process,
you can specify your preferred ratio. Alternatively,
it is also possible to change the ratio after the unit
is installed in the field. To change the CT ratio,
follow the steps below:
1.
For single-tank units, remove the front door.
For 3SP units, remove the pole bucket to
access the circuit board mounted on the
actuator assembly (see figure 38).
2. Locate the J1 terminal on the circuit board.
3. Obtain a terminal block jumper strip with
at least 6 pins.
4. Depending on the desired ratio, break the
jumper strip into either 3 sets of 2 pins for a
600:1 ratio or 2 sets of 3 pins for a 300:1 ratio.
5. For a 600:1 ratio, insert the 3 sets of 2-pin
jumpers into pins 1–2, 3–4 and 5–6 of the J1
terminal (see figure 39).
6. For a 300:1 ratio, insert the 2 sets of 3-pin
jumpers into pins 1–2–3 and 4–5–6 of the J1
terminal (see figure 40).
7. Contact ABB technical support to inform them
about this change. Request an updated
nameplate based on the unit’s serial number.
8. Adjust the relay settings to reflect the new
CT ratio.
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