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Systems Integration Specialists Company, Inc. The Standards Based Integration Company © Copyright 2012 SISCO, Inc. Annual WECC Testing Overview for C-RAS.

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Presentation on theme: "Systems Integration Specialists Company, Inc. The Standards Based Integration Company © Copyright 2012 SISCO, Inc. Annual WECC Testing Overview for C-RAS."— Presentation transcript:

1 Systems Integration Specialists Company, Inc. The Standards Based Integration Company © Copyright 2012 SISCO, Inc. Annual WECC Testing Overview for C-RAS Version 1.0

2 © Copyright 2012 SISCO, Inc. 2 Outline of Presentation l What has been approved for RAS at SCE l What was presented and approved by WECC for the SCE C-RAS l The new proposal

3 Pastoria Energy Facility (PEF) RAS Auto-Test Feature WECC RAS Reliability Task Force Presentation Howard Ham April 29, 2004

4 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)

5 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)

6 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.

7 Systems Integration Specialists Company, Inc. The Standards Based Integration Company © Copyright 2012 SISCO, Inc. For C-RAS Previously presented and concept approved by WECC circa 2007

8 - 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 - 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 - 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.

11 Systems Integration Specialists Company, Inc. The Standards Based Integration Company © Copyright 2012 SISCO, Inc. Some new thoughts

12 © Copyright 2012 SISCO, Inc. 12 Whats changed in thought process: l Verification of Communication Paths l Verification of ability to receive information from Monitoring Relay l Verification of the ability to simulate a line-out from a monitoring relay l Verification of ability to send information to the Mitigation Relay(s) l Verification of ability of the Mitigation Relay to trip. Note: What got tested was special test code.

13 © Copyright 2012 SISCO, Inc. 13 For C-RAS, analysis shows: l Yearly test based upon RAS: Is not efficient. Decreases overall system availability. Requires special testing code to be developed per RAS. l Proposed revised testing philosophy, per IED/Relay Allows RAS to still operate. Overlapped relays are tested only once. Allows individual relays to be tested independently. Allows test code to be generated once: One set of code for Monitoring Relays. One set of code for Mitigation Relays.

14 © Copyright 2012 SISCO, Inc. 14 How it would work (per IED): General Flow Initialization Mitigation Relay SequenceMonitoring Relay Sequence Mitigation Relay Clean-up Termination Monitoring Relay Clean-up

15 © Copyright 2012 SISCO, Inc. 15 Initialization Sequence of testing l Sequence Place the internal virtual IED into year-end test mode. This causes the associated relay to be commanded to enter test mode. Relay sends back its status that it is in test mode. l Resulting states of the initial sequence: Bi-directional communication has been verified with the relay (monitoring or mitigation). Relays are in test mode. Analytics understand that a relay is unavailable due to its test status being returned.

16 © Copyright 2012 SISCO, Inc. 16 Mitigation Sequence of testing l Normal Mitigation Testing Sequence Command LSR to go into safe mode. This causes the status of the LSR to be returned. If safe, Command to close trip contact is issued. Status of contacts is returned. Command to open trip contact is issued. Status of contacts is returned. l Failure recovery: If cant enter safe mode, declare failed test. If cant trip, declare failed test and leave relay in test state.

17 © Copyright 2012 SISCO, Inc. 17 Mitigation Sequence of testing l Mitigation Clean-up Command LSR to go back into normal mode. This causes the status of the LSR to be returned. l Failure recovery: If cant change LSR, declare failed test and leave relay in test state.

18 © Copyright 2012 SISCO, Inc. 18 Termination Sequence l Sequence Remove year-end-test mode from the internal virtual IED This causes the associated relay to be commanded to leave test mode. Relay sends back its status that it is not in test mode. l Resulting states of the initial sequence: Bi-directional communication has been verified with the relay (monitoring or mitigation). Relays are no longer in test mode. Analytics understand that a relay is available due to its test status being returned.

19 © Copyright 2012 SISCO, Inc. 19 Monitoring Relay Sequences l Similar to Mitigation Relay sequence. l Tests the ability to simulate line out status.

20 © Copyright 2012 SISCO, Inc. 20 Testing 2-of-3 Voting in C-RAS l Only applies to Mitigation Relays l Requires coordination of the three UAPs within the system. Preliminary Relay GOOSE Layout Test Mode Auto-Test Mode Contact Status* Rxd CMD UAP1 Rxd CMD UAP2 Rxd CMD UAP3 Status Information Needs Attention - Used by Yearly Test * SCE uses relay latched contacts Instead of LSRs now.

21 © Copyright 2012 SISCO, Inc. 21 Does the 2-of-3 voting need to be tested? l Know that the message/trip was received and from which UAP. l Know that the contact can operate. l Just dont know if the 2-of-3 voting logic was changed. Preliminary Relay GOOSE Layout Test Mode Auto-Test Mode Contact Status* Rxd CMD UAP1 Rxd CMD UAP2 Rxd CMD UAP3 Status Information Needs Attention - Used by Yearly Test

22 © Copyright 2012 SISCO, Inc. 22 No change in test coverage Testing of ItemRASC-RASProposed Comm Path UpMonitoring/Mitigation Comm Path DownMitigation/MitigationMonitoring/Mitigation Test Code ExecutionYes Attempt to Trip CBYes Simulation of Line OutYes

23 © Copyright 2012 SISCO, Inc. 23 Benefits l RAS continue to operate (minus one relay). Increases availability Code is re-usable Allows for independent testing of individual relays Overlapping relays only tested once.


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