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Just a little C37.2 history. Probably the oldest standard in regular useFirst published in 1928 as AIEE No. 26Provided a language to describe
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1. The 2008 Revision of IEEE C37.2 Standard Electrical Power Device Function Numbers, Acronyms and Contact Design ations – and Its Impact on Relay & Control Engineers John T. Tengdin – WG Chair
PSRC I14 and Substations C5 Working Groups
Consultant, OPUS Publishing
San Clemente, CA 92673
Email: j.t.tengdin@ieee.org 1 First, my company. All we publish is a web site for S/A info
First, my company. All we publish is a web site for S/A info
2. Just a little C37.2 history Probably the oldest standard in regular use
First published in 1928 as AIEE No. 26
Provided a language to describe “Automatic Substations”
Has always been a Substations standard
So what were these Automatic Substations?
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5. Evans Avenue Substation of the United Railways of St. Louis showing Automatic Control and Reclosing Feeders for Two 1000 KW Synchronous Converters (circa 1924) 5
6. 6 Many of these 1924 function numbers are still in use today, and are still in IEEE C37.2Many of these 1924 function numbers are still in use today, and are still in IEEE C37.2
7. First edition (1928) of C37.2 hadlots of familiar device numbers 27 – undervoltage relay
40 – field relay
49 – machine or transformer thermal relay
50 – instantaneous overcurrent relay
51 – ac time overcurrent relay
52 – ac circuit breaker
72 – dc circuit breaker
79 – reclosing relay (just ac, another number for dc) 7 50 = “operates with no intentional time delay” Originally were plunger relays
When “cup type” instantaneous relays were invented, the suffix HS was added for “high speed”, as 50 HS relays were faster than ordinary 50 “instantaneous” relays50 = “operates with no intentional time delay” Originally were plunger relays
When “cup type” instantaneous relays were invented, the suffix HS was added for “high speed”, as 50 HS relays were faster than ordinary 50 “instantaneous” relays
8. And some not so familiar to this audience 1 – master element
7 – rate of change relay
10 – unit sequence switch
19 – starting to running transition contactor
22 – equalizer circuit breaker
82 – dc load measuring reclosing relay 8 Device 1 = “A device, such as a control switch, etc. that serves - - - -to place equipment in or our of operation Yuba City trolley at June 07 PES General Meeting
A device 82 measured the rate of rise of dc current on a feeder. A fast rate of rise meant a fault (conductor down, hazardous, so no reclosing). A slow rate of rise probably meant an over aggressive trolley motor man who had cranked his controller around to a higher speed too fast. Reclosing OK Device 1 = “A device, such as a control switch, etc. that serves - - - -to place equipment in or our of operation Yuba City trolley at June 07 PES General Meeting
A device 82 measured the rate of rise of dc current on a feeder. A fast rate of rise meant a fault (conductor down, hazardous, so no reclosing). A slow rate of rise probably meant an over aggressive trolley motor man who had cranked his controller around to a higher speed too fast. Reclosing OK
9. Some not defined in 1928Others added later as needed These not originally defined
16 – “not used (Reserved for future applications)”
95-99 – “used only in specific applications if none of the functions 1 through 94 are suitable”
Others were added as needs arose
24 – volts per hertz relay (added in 1962)
9 Device 24 addition (a brand new relay) was prompted by GSU failures on over excitation during startupDevice 24 addition (a brand new relay) was prompted by GSU failures on over excitation during startup
10. Lots of past (infrequent) revisions 1937, 1945, 1956, 1962, 1979, 1987, 1996
Major changes in 1996
Added “filled box” and “empty box” methods of defining the contents of a Device 11 multifunction device (three or more functions)
Added eight examples of proper use of suffixes N and G in ground detector relay applications
Reaffirmed in 2001 (no changes)
10 In 2001, both PSRC and Substations working groups agreed to reaffirmation, as so no need for any changes!In 2001, both PSRC and Substations working groups agreed to reaffirmation, as so no need for any changes!
11. 2007/2008 Update of C37.2 JTT’s infamous observation at PSRC Sept 06 “Nothing changed, just plan to reaffirm”
Alex Apostolov – “at least add a cross reference table to IEC 61850 logical nodes – I’ll do it”
Then came Eric Udren’s proposal for the use of Device 16 (then “reserved for future apps”)
Formed WG I14 in PSRC, C5 in Substations plus corresponding members from IAS, etc. 11 WG Corresponding members from IEEE Industry Applications Society Standards Committee, its Rural Electric Power Committee and the IEEE Rail Traction Standards SubcommitteeWG Corresponding members from IEEE Industry Applications Society Standards Committee, its Rural Electric Power Committee and the IEEE Rail Traction Standards Subcommittee
12. First thought – we just need seven new function numbers Question – Could we retire and reuse old numbers dating back to 1928?
10 - unit sequence switch
22 – equalizer circuit breaker
35 – brush operating or slip-ring short circuiting device
58 – rectifier failure relay
70 – rheostat (electrically operated)
82 – load measuring reclosing relay
93 – field changing contactor
How to find out if still in use?
Use IEEE Strategic Planning Services 12
13. IEEE Strategic Research and Planning in Piscataway – Marc Beebe, Mgr. Helped structure a simple on-line questionnaire
For each function, included the full description from IEEE C37.2
For each function, asked for recommendations
Definitely keep
Perhaps keep
Perhaps retire & reuse
Definitely retire & reuse
Don’t know
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14. On line Email survey
Simple to structure – web page for answers
Initiated by an Email invitation letter
Initially sent to five IEEE lists
Added several large Email lists
Data summary by IEEE staff – great job!
14 Survey Services of IEEEStrategic Planning and Research Washington State helped by sending the invitation letter to everyone on their WPDAC and their WPRC Email lists. So did Texas A& M and Georgia Tech. and so did several manufacturersWashington State helped by sending the invitation letter to everyone on their WPDAC and their WPRC Email lists. So did Texas A& M and Georgia Tech. and so did several manufacturers
15. Strategic message forwards Philadelphia Electric engineer – no, but try
Amtrak engineer at 30th St. Station – yes, using some function numbers, also ask
NYC Subway System engineer – yes to
those plus others. Also ask:
Rail Transit System consulting engineer –
yes to those plus more
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16. Survey Results Almost 1900 responses
Five of the seven function numbers definitely in use now and in the future
Two are borderline, but
New Information – we need at least fifteen new functions, not just seven
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17. WG Suggestion – How about acronyms (many in common active use now) Alternate solution – use numbers above 99 (opposed by some – already used, per C37.2 examples)
Heated discussion in both working groups
Did an Email ballot of the then 42 members of combined I14 & C5 working groups
Ballot was 2:1 in favor of acronyms
Formal IEEE SA ballot – no Negative ballots on the use of acronyms 17
18. Formal IEEE SA Ballot Invitations to the IEEE SA Email lists for:
PSRC, PSCC, Substations, IAS Standards Committee, IAS PSPC & Rural Electric Power Committees and the IEEE Rail Traction Standards Subcommittee
Balloting body membership of 203 persons
Balloting completed in May 2008 (4 recircs)
Approved by RevCom at its June 08 meeting
Final editing underway
Hope to publish soon (but a glitch) 18
19. Final Document will include Complete description of Device 16 with example diagrams (including a dual redundant configuration)
Addition of seventeen new acronyms
Complete cross reference table to IEC 61850 logical nodes
Ten suffix letters (new to C37.2 e.g. SOTF, POTT)
Addition of a new “List Box” method to describe contents of a Device 11
Addition of a “Coordinated Trip Circuit Fusing” diagram from a PSRC WG report 19
20. Device 16 Suffixes First suffix letter S (= serial device) or E (= Ethernet device)
Subsequent suffix letters:
C – Security processing function (VPN, encryption, etc.)
F – Firewall or message filter function
M – Network managed function (e.g., configured via SNMP)
R – Router
S – Switch (Examples: Port switch on a dial up connection is 16SS, an Ethernet switch is 16ES)
T – Telephone component (Example: Auto-answer modem)
Combinations - 16ERFCM = Ethernet Router / Firewall / VPN / Network Managed 20
21. Substation Comm Configurations IEC 61850 Part 6 limitations
Only can show logical connections, not physical
Cannot show switches, firewalls, network management
No redundancy (“out of scope”)
IEEE C37.2 Device 16 Suffixes include all 21
22. 22 Serial connections
16 SCT = Serial - Security function - Telephone auto answer modem
16 SS = Serial - port switch
Serial connections
16 SCT = Serial - Security function - Telephone auto answer modem
16 SS = Serial - port switch
23. 23 16 ESM = Ethernet – Switch – SNMP Network managed
16 ERFCM = Ethernet – Router – Firewall – security function – Network managed16 ESM = Ethernet – Switch – SNMP Network managed
16 ERFCM = Ethernet – Router – Firewall – security function – Network managed
24. 24 This dual redundant diagram was added in the 2nd Recirc BallotThis dual redundant diagram was added in the 2nd Recirc Ballot
25. What New Acronym Functions in C37.2? Note: These are functions that may reside in a single function device or in a multifunction device 11
First list –DFR, HMI, PMU, RTU, SER
Added functions: AFD, CLK, DDR, ENV, HIZ, HST, LGC, MET, PDC, PQM, RIO, TCM 25
26. Seventeen New C37.2 Functions AFD – Arc Flash Detector
CLK – Clock or timing source
DDR – Dynamic Disturbance Recorder
DFR – Digital Fault Recorder
ENV – Environmental data
HIZ – High Impedance Fault Detector
HMI – Human Machine Interface
HST – Historian
LGC – Scheme logic (function, as in a RAS– not a device like a PLC)
MET – Substation Metering
PDC – Phasor Data Concentrator
PMU – Phasor Measurement Unit (the function)
PQM – Power Quality Monitor
RIO - Remote Input/Output Device
RTU – Remote Terminal Unit / Data Concentrator
SER – Sequence of Events Recorder
TCM – Trip Circuit Monitor
26 Obviously, some are not “new” (DFR, HIZ, HMI, PMU, RTU, SER) but were never before in C37.2
TCM added in the 1st Recirc BallotObviously, some are not “new” (DFR, HIZ, HMI, PMU, RTU, SER) but were never before in C37.2
TCM added in the 1st Recirc Ballot
27. TCM – Trip Circuit Monitor Today’s red light on a relay or control panel signifies what?
Circuit breaker is closed
What else? Tripping voltage? Trip coil intact?
None of these if just fed from a 52a contact
TCM definition
A device / function that monitors an associated circuit breaker’s trip circuit for continuity and for the presence of tripping voltage, and sets an externally readable alarm when continuity or tripping voltage is lost.
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28. Figure 4 Independent trip and close fusing 28 Can close the breaker even if the trip fuse is blownCan close the breaker even if the trip fuse is blown
29. Figure 5 Control circuits with coordinated trip and close fusing – no close w/o trip voltage 29 C37.2 -2008 Figures 4 & 5 were copied from the Power System Relaying Committee Working Group Report “Relay Trip Circuit Design” available at http://www.pes-psrc.org/
C37.2 -2008 Figures 4 & 5 were copied from the Power System Relaying Committee Working Group Report “Relay Trip Circuit Design” available at http://www.pes-psrc.org/
30. Ten (new to C37.2) Device number suffix letters BU – Back up
DCB – Directional comparison blocking
DCUB – Directional comparison unblocking
DUTT - Direct underreaching transfer trip
GC - Ground check
POTT - Permissive overreaching transfer trip
PUTT - Permissive underreaching transfer trip
SOTF - Switch on to fault
TD - Time delay
Z - Impedance
31. List Box Method 31 This is a much more useful method than either of the two earlier methods
Xxxx is for the manufacturer’s model number This is a much more useful method than either of the two earlier methods
Xxxx is for the manufacturer’s model number
32. Example from cross reference table (3 pages long in C37.2 Annex) 32 All of the C37.2 function numbers and acronyms are listed in the table, whether or not there is a corresponding IEC logical nodeAll of the C37.2 function numbers and acronyms are listed in the table, whether or not there is a corresponding IEC logical node
33. Members of Joint C5/I14 WG 33
34. Special Recognition to: Alex Apostolov – for his push for and creation of the IEC 61860 cross reference table
Eric Udren – for his development of Device 16 for communication devices – serial and Ethernet (plus example diagrams)
Mike Thompson – for his development of the much more useful “List Box” method to describe contents of a Device 11
- And to a very dedicated joint working group and to Soo Kim at IEEE SA who helped make it happen!
Next – spreading the word – in house +
conferences, PES /IAS chapter meetings
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35. So -Why Should Relay and Control Engineers Care? 35 Let me give you a capsule summaryLet me give you a capsule summary
36. Major revisions the first since 1995 Substantial additions
1 - New – ten more suffix letter combinations
2 - New – seventeen acronyms for new functions
3 - New – use of Device #16 for substation data comm
4 – New – “List Box” method to describe Device 11
5 – New – Large cross reference table to IEC 61850
6 – New (to C37.2) Coordinated Trip & Close Fusing
Plus clarified language
Work done by joint PSRC/PES Substations WG
(C37.2-2008 Published October 2008)
1 – used to better describe functions, more relay functions like POTT, SOTF –also “GC” for Ground Check
2 – ran out of numbers, IEEE SA survey proved all old numbers still in use
3 – Device # 16 has its own set of unique suffix letters
4 – Better way to describe all the contents of a multifunction device 11 – From Negative ballot
5 – Cross reference table is three pages long
6 – Close fuse downstream from trip fuse – From PSRC WG Report “Relay Trip Circuit Design – From ballot comment
1 – used to better describe functions, more relay functions like POTT, SOTF –also “GC” for Ground Check
2 – ran out of numbers, IEEE SA survey proved all old numbers still in use
3 – Device # 16 has its own set of unique suffix letters
4 – Better way to describe all the contents of a multifunction device 11 – From Negative ballot
5 – Cross reference table is three pages long
6 – Close fuse downstream from trip fuse – From PSRC WG Report “Relay Trip Circuit Design – From ballot comment
38. Questions? John T. Tengdin, P.E
Life Fellow IEEE
OPUS Publishing
2859 Calle Heraldo
San Clemente, CA 92673-3572
ph/fax 949-361-9595
Email: j.t.tengdin@ieee.org
Chair - Joint PES Substations WG C5 &
Power System Relaying Committee WG I14 38
39. Anyone putting comm in harsh E/M environments? Check out IEEE 1613
“Standard Environmental and Testing Requirements for Communications Networking Devices in Electric Power Substations”
Based on four PSRC standards 39