Table of Contents
Advertisement
Section 6
Testing functionality
6.8.3.1
120
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 -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 Initiate reclosing). During tripping it goes low for a recharging time, for
example, 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 manual switch, SRY.
Information and material for the verification:
•
Protection or control unit, Intelligent electronic device (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, e.g. 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 Synchronism check SESRSYN (25) condition.
Preparation of the verification
1.
Check the function settings. In the HMI tree they are found under Main menu/
Settings/IED Settings/Control/STBRREC(79,0->1)/1:STBRREC
If any timer settings are reduced to speed-up or facilitate the testing, they shall be
set to normal after testing. A temporary label on the unit can be a reminder to
restore normal settings after which a verification test should be performed.
2.
Decide if a synchronization check (SYNC) shall be included in the test.
1MRK 506 331-UUS A
Commissioning Manual
Advertisement
Table of Contents
