Autorecloser (Rrec, 79) - ABB REL670 Installation And Commissioning Manual

11.1.5
11.2
Control
Completing the test
Continue to test another function or complete the test by setting the test mode to off.

Autorecloser (RREC, 79)

Verification of the automatic reclosing function can be considered to consist of two parts; one
part to verify the internal logic and timing of the function and one part to verify its interaction
with the protection system. This section deals with verification of the auto-reclosing function it-
self. However it is practical to start the auto-reclosing function by activating a protection func-
tion, e.g. by secondary injection tests.
Prepare the IED for verification of settings as outlined in the
2 "Preparing for test" in this chapter.
The purpose of verification before commissioning is to check that entered selections, setting pa-
rameters and configuration render the intended result. The function is flexible with many options
and facilities. At commissioning only the selections and settings intended for use are verified. If
one chooses to reduce some time settings in order to speed up verification, be careful to set the
parameters at intended operational values at the end of the verification procedure. One such pa-
rameter is the reclaim time and could result in a long delay of reclosing shots, e.g. shot 2 and
later ones.
The verification test is performed together with protection and trip functions.
trates a suggested testing arrangement, where the circuit-breaker (CB) is simulated by an exter-
nal bi-stable relay (BR), for example a relay type RXMVB2 or RXMD. The following manual
switches are used:
• Switch or push-button to close (SC)
• Switch or push-button to trip (ST)
• Switch for CB ready condition (SRY)
If no bi-stable relay is available, replace it with two self-reset auxiliary relays and use a
self-holding connection.
Use a secondary injection relay test set to operate the protection function! The test set shall be
switched off when a trip signal is given or when the BR comes to open position to simulate real
conditions.
The CB simulation can be made more elaborate, including simulation of the operating gear con-
dition, CBREADY of either the type ready for a Close-Open (CO) cycle, or the type ready for
an Open-Close -Open (OCO) cycle.
The CB condition CBREADY of a type, CO, shall be high (true) until a closing operation is per-
formed. It then goes low (false) for a recharging time of about 5 - 10 s. After that it is high again.
A CB condition CBREADY of a type, OCO shall be high (true) before and during tripping (Start
reclosing). During tripping it goes low for a recharging time, e.g. 10 s. It may thus be low at the
instant of reclosing. After each Open or Close operation it may need a recharging period before
it goes high again.
In the example of CB simulation arrangement, the CBREADY condition is simulated by a man-
ual switch, SRY.
Chapter 11
Verifying settings by secondary
section 1 "Overview" and section
Figure 35
injection
illus-
141