Figure 197: Spring-Loaded Ct Shorting Contacts - GE MiCOM P40 Agile Technical Manual

Chapter 19 - Installation
ensure that the terminals into which the CTs connect are shorted before the CT contacts are broken, when
withdrawing the cradle from the case. This ensures that no voltage is developed between the two terminals on
breaking the CT connections.
If no CTs are present, the CT terminals are permanently shorted internally.
E01407

Figure 197: Spring-loaded CT shorting contacts

Before withdrawing the cradle it is important to:
Check the existing case for any damage
●
● Check the wiring is in good condition, especially the earth wiring
Check the continuity of the earth connection to the cublicle earthing bar.
●
If there is any doubt as to the integrity of any of these aspects, contact your local representative.
Caution:
After removing the K-series product from its case, refit it into the case that came with
your device, for storage or reuse in another location.
The difference between a standard device and a K-series retrofit device is that the retrofit device has internal links
between terminals 7 and 13, and terminals 8 and 14 respectively. This is so that equipment driven by the K-series
field voltage conected to terminals 7 and 8, will continue to be driven indirectly via terminals 13 and 14 when
replaced by P40 Agile products.
A K-series device provides a 48 V DC field voltage between terminals 7 and 8. This field voltage is intended for
driving auxiliary equipment such as opto-inputs. P40 Agile devices DO NOT provide this field voltage. For this
reason, P40 Agile retrofit devices have internal shorting links between terminals 7 and 13, and terminals 8 and 14
respectively. The intention of this is to provide the auxiliary supply voltage to terminals 7 and 8 in lieue of the field
voltage.
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