Hitachi Relion 670 Series Commissioning Manual page 217

1MRK506371-UUS Rev. M
This section deals with verification of the auto recloser itself. However, it is practical to initiate the auto
recloser by activating a protection function, for example, by secondary injection tests.
Prepare the IED for verification of settings outlined in Section
The purpose of verification before commissioning is to check that entered selections, setting and
configuration render the intended result. The auto recloser 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 auto recloser at intended
operational values at the end of the verification procedure. One such parameter is the tReset time that
must be timed out before a new test sequence can be performed.
The verification test is performed together with protection and trip functions.
Figure 54
external bi-stable relay (BR), for example a relay type RXMVB2 or RXMD or Breaker Simulator of Hitachi
Power grids. 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 or breaker simulator is available, replace it with two self-reset auxiliary relays and use
a self-holding connection.
Use a secondary injection IED test set to trip 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 condition,
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 performed. It
then goes low (false) for a recharging time of about 5 - 10s. After that it is high again.
A CB condition CBREADY of a type, OCO shall be high (true) before and during tripping (initiate auto
reclosing). During tripping it goes low for a recharging time, for example, 10s. 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 manual switch,
SRY.
Information and material for the verification:
• Protection or control unit, IED, configured and with settings entered.
• Configuration diagram for the IED
• Terminal diagram for the IED, or plant circuit diagram including the IED
• Technical reference manual for the IED
• IED test set for secondary injection
• Means to indicate, measure and record operation and times, for example an event recording facility
• A bi-stable relay (BR) or two auxiliary relays to simulate a CB
• Two push-buttons (SC, ST) to operate the BR and a change-over switch (SRY) to simulate
CBREADY
• Possibly a switch simulation the synchronizing check SESRSYN (25) condition
Line distance protection REL670
Commissioning manual
illustrates a suggested testing arrangement, where the circuit-breaker (CB) is simulated by an
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Testing functionality by secondary injection
"Preparing the IED to verify
Section 11
settings".
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