Pastoria Energy Facility (PEF) RAS Auto-Test Feature WECC RAS Reliability Task Force Presentation Howard Ham April 29, 2004
Auto-Test Logic Step 1: Push-button initiates test Required conditions: No line-open conditions exist (LV20 deasserted) No generator trips are present (R1P13 deasserted) Valid data is being received from all stations (LV22 asserted) Sets latches LT21 (Test Start) and LT22 (Disable Trips) Resets latches LT23 (Test Fail), LT24 (Test Pass), and LT25 (Test Stop) Starts 5-second timer (SV1)
Auto-Test Logic Step 2: Latch LT22 does two things Sends Mirrored Bit 7 to PEF, blocking generator trips Blocks N-2 contingency recognition Step 3: Confirm PEF trips disabled (LV25 asserts) Step 4: LV31 asserts, sending Mirrored Bits to all Line Monitor Interface relays to simulate all lines open. Step 5: Confirm all lines show open (LV21 asserts) Step 6: Send Mirrored Bits trips to all PEF generators Step 7: Confirm PEF closed all trip output contacts (LV24 asserts)
Auto-Test Logic Step 8: Test pass or fail If SV1 has not timed out, latch LT24 (Test Pass) is set. If SV1 times out before reaching step 8, latch LT23 (Test Fail) is set instead. Step 9: Set latch LT25 (Test Stop) and reset latch LT21 (Test Start) Step 10: LV31 deasserts, turning off Mirrored Bits to trip PEF generators and to simulate all lines open. Step 11: When all lines show closed, LV20 deasserts. When all PEF generator trips show open, R1P13 deasserts. LV29 then asserts. Step 12: Latch LT22 (Disable Trips) resets, which: Stops sending Mirrored Bit 7 to PEF, restoring trip outputs. Unblocks N-2 contingency recognition Test is now complete.
- 8 - When Analytic is placed into test mode… C-RAS Analytic in RASP (1) (1) – GOOSE information sent to Analytics MPs to go into block mode. (3) – Analytic begins processing test information once all MPs indicate blocked. (3) If MPs dont indicate blocked within a pre-determined time, Analytic transitions to a TEST-FAILURE status. C-RAS Analytic in RASP (1) (1) – GOOSE information sent to Analytics MPs to go into block mode. (2) (2) – MP sends status indicating that it is in blocked mode. (3) – Analytic begins processing test information once all MPs indicate blocked. (3) If MPs dont indicate blocked within a pre-determined time, Analytic transitions to a TEST-FAILURE status. Previously Presented to WECC
- 9 - Use cases 1: LM and Analytic 1 placed into Test Mode (simplified) LM A1 Substation 1 Substation 2 AN 1 AN 2 AN 3 RASP 1 LM A2 Analytic 1 process test and non-test data. Operates MPs that are in BLOCKED mode. Analytic 2 & 3 treat test information as bad-quality information. Adapt algorithms based upon MPs in BLOCKED mode.. Operates MPs that are not in BLOCKED mode.
- 10 - SCE/WECC Periodic Testing - Current n Press a button on an LM to instruct a RASP to enter a special test mode. n The special test mode places the RASPs MPs into BLOCKED mode. n The special test mode operates the MPs and CLOSURE information is returned to the RASP. n RASP indicates test success to LM where button was pressed.