up verification, be careful to set the parameters 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
17
illustrates a suggested testing arrangement, where the circuit-breaker (CB) is simulated by
an external bi-stable relay (BR), for example a relay type RXMVB2 or RXMD or Breaker
Simulator of ABB. 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 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 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 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
1MRK 505 293-UUS A Section 6
Testing functionality
101
Commissioning manual
To Next Page
Loading...
