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Gossen Metrawatt MAVOWATT 20 Manual

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E-15
APPENDIX E/ Common Circuit Connections
Connecting to a Current Transformer (CT)
Safety
precautions
The following safety precautions apply to current transformer (CT) connections in
addition to those safety precautions stated on page E-3.
• Never energize a CT with the secondary open.
• Never disconnect the secondary of a CT with primary energized.
WARNING
Refer to the manufacturer’s instructions related to the CT for exact information
for connections for current monitoring. Do not exceed manufacturer’s ratings.
ADVERTENCIA
Consulte las instrucciones del fabricante referentes a TC (transformador de
corriente) para la información exacta de las conexiones a fin de monitorear la
corriente. No exceda las capacidades nominales del fabricante.
AVERTISSEMENT
Se reporter aux instructions du fabricant relatives au transformateur de courant
(Current Transformer - CT) pour obtenir les renseignements exacts sur les
connexions utilisées pour la surveillance du courant. Ne pas dépasser la puissance
recommandée par le fabricant.
WARNUNG
Genaue Informationen zu Verbindungen für die Stromüberwachung entnehmen
Sie bitte den Anleitungen des Herstellers (siehe Stromumwandler). Die
Grenzwerte des Herstellers sollten nicht überschritten werden.
NOTE
Current Transformers are not manufactured by Dranetz-BMI and are discussed here for
informational purposes only.
Description
Current transformers, also known as instrument transformers, reduce high level
currents to low level currents so they can be safely monitored. These devices are
similar to PTs used for voltage measurements in that both reduce values for safe
measurement. The reduction, or step-down ratio, is stated as a scale factor that is used
by the Energy Platform to step-up the measured value to its original value.
Types of CTs
There are single-phase CTs and polyphase CTs dependent on the source transformer
used. Current reduction ratios vary widely and are also dependent on the source
transformer used. Rating plates attached to the CT provide information as to the ratio
and current limitations.
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