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Section 6: Application Considerations and Examples
6.1
High Impedance Scheme Components
Typical components used in a 3-phase high impedance protection scheme are shown in fig. 6.1. Dependent on
the requirements of the scheme these may include:
7SR23 DAD High impedance relay
Series stabilising resistor x 3
Metrosil x 3 (voltage limiting resistors)
Note that these components are optionally available with fixed values and housed in an E6 case.
Guidance on using the component box and fixed value components is given in th separate publication –
User Manual: High Impedance Component Box.
Zone shorting relay
7XG22 Test module
Trip relay(s)
©2013 Siemens Protection Devices Limited
Figure 6-1
Discrete Relay Circuit Components
Chapter 7) 7SR23 DAD Applications Guide
Chapter 7 Page 30 of 42
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