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Standards Development
To provide additional requirements, tests and acceptance criteria for Instrument Transformers integrated with other devices (e.g.: fuses and bushings). This refers to the two main categories: Instrument Transformers (ITs) into which other devices are incorporated (for example: voltage transformers with integral fuses) and IT integrated into other devices (for example IT integrated into a bushing). In particular, the relevant Standards related to components assembled together in order to form one new electric device will be taken into consideration. The IT conside red are conventional IT and Low Power Instrument Transformers (LPITs) with assigned primary voltage above 1 kV.
The device potentially concerned by integration with instrument transformer include (but are not limited to):
- Fuses
- Bushings
- Insulators
- Cable terminations
With the increasing diffusion of equipment integrating instrument transformers and other devices, TC38 has recorded from manufacturers and users some difficulties and controversial interpretations when applying multiple standards to the same, integrated device. This concern coming from the market h as led TC38 to identify the need to issue a publication able to clarify the requirements and tests in case of integrated devices.
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