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Chapter 7) 7SR158 Applications Guide
Chapter 7) Page 8 of 24
©2014 Siemens Protection Devices Limited
Figure 2.3-2 Neutral Overvoltage Protection Connections
2.3.1
Application with Capacitor Cone Units
Capacitor cones are used to provide a neutral voltage output where conventional VTs are too large or too
expensive. A capacitor cone adaptor unit (type 7XG21) is used with the 7SR158 to enable the relay input to be
calibrated for a range of capacitor cone values such that protection settings and instruments can be scaled to the
primary NVD value - see Figure 2.3-2.
2.3.2
Derived Neutral Voltage
Neutral voltage can be derived from the three phase to neutral voltages – the relay will derive neutral voltage
when the ‘CT/VT CONFIG’ setting is selected to ‘Van,Vbn,Vcn’. Note with this method the NVD protection may
mal-operate during a VT Fail condition.
Содержание 7SR158 Argus
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