Technical Guide
Testing self-powered relays with SVERKER 900
Page 28(33)
Figure 33. Result for the time characteristic of the two-stage phase overcurrent protection, from SVERKER
Viewer. The green lines represent values at 1,3 times the threshold, suitable for having the indication of
representative values for the operate time (see par. 4.1.3). Clearly it was not necessary to run tests above the
1,3 values for I>> (definite time). For inverse time curves, it is a very good hint to follow this rule.
6.3. Testing the tripping circuits of WIP-1 (self-test).
The procedure of “testing the tripping circuits” for WIP-1 is described in the relay manual [4] and shortly shown
in Figure 27.
First WIP-1 relay must be prepared for this, by the procedure indicated in Figure 27. Once the relay is prepared,
the user has 30 seconds to manage a current injection of 1A in phase L1. If this time elapses without that the
injection has occurred, the procedure must be started again from the relay HMI.
Before preparing the relay for this test, prepare the SVERKER 900 connections and the test sequence. For this
test, the Sequencer instrument will be used in SVERKER 900.
SVERKER 900 current generators should be connected in
parallel mode
15
.
A particular 3-step test sequence is necessary to manage this test:
1) STEP 1: Injection of 1A in L1, for 190 ms (Figure 34)
2) STEP 2: No injection for 40 ms (Figure 35)
3) STEP 3: Injection of 1A in L1, for 30 s (Figure 36).
During the third step, the WIP-1 relay will start its own self-testing procedure. Several contacts will click several
times and if everything is all right, the WIP-1 will inform that the test has been performed.
15 The activation of this test may also succeed when current generations are set in individual mode, but due to tolerances and
high non-linearity of the load offered by WIP-1 relay when this mode is activated, we suggest to use the parallel mode
connection
