The TR800 is a portable instrument designed for the accurate ratio measurement of transformers and all devices with AC ratiometric dividers associated with them. Built-in three-phase lead switching High ratio range; 1:1 to 2021: 1, Built into the TR800 is a current meter for the measurement of the exciting current of the transformer under test. Keeping a history fo excitation current has proved to be a reliable way of detecting problems in transformers.
This information is valid for the Capacitive Dividers and Capacitive Voltage Dividers The Connection for a typical measurement using the auxiliary transformer. It should be noted that the ratio of the CVT may be different when tested at 0-5 kV than at the operating voltage due to the non-linearity of the components used in the CVT. Alternatively, the TR700/800 Ratiometers may be used to test separately, first the divider and then the intermediate voltage transformer. This test, however, is limited to CVT’s with accessible High voltage connections.19