Date Code 20011026 Maintenance and Testing 7-13
SEL-321/321-1 Instruction Manual
Figure 7.2: Low-Level Test Interface
TEST SETUP
Test Source Connections
Each relay element test requires that ac voltage and/or current signals be applied to the relay.
The figures and text below describe the test source connections required for relay protection
element tests.
Three Voltage Source and Three Current Source Connections
Figure 7.3 shows connections to use when three voltage sources and three current sources are
available. Any protective element may be tested and any fault type simulated using these
connections.
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