Operating Error - East River
.
Operating Error - Cherry St
.
Operating Error - West 42nd
.
0400-0400
PSMP
- Compliance with NERC Standard PRC005-6
- PM of protection system elements:
- Protective relays
- Communication systems
- V/I sensing devices
- Station DC supply
- DC control circuitry
- Time-based maintenance program for BES protection
- PSMP maintenance intervals meet or exceed NERC requirements
- Maximo asset and work management software to schedule/track time-based maintenance (listed by zone of protection)
0400-0400
PM Frequency
Protective BES Microprocessor Relay – 6 years
(analog-to-digital, settings, I/O)
Protective BES Non-Microprocessor Relay – 4 years
(Calibrate following Protest test plans, relay manufacturer, 0400 instructions)
Communication Systems – 4 years, 12 years
(Operational tests)
CT/PT – Same interval as protective relay
In service/Out of service (CT SAT)
DC Control Circuitry – 4 years (BES)/6 years (non-BES)
Trip checks
Station DC Supply – 4 months/18 months (SSM/Station Operators)
Supply voltage, etc
Alarm Paths – 12 years
UFLS – 12 years
0400-0205
Microprocessor Relay Maintenance and Testing
- Equipment: Protection Suite, Microprocessor Relay Maintenance Form, laptop, relay software, Doble Test Set, multimeter, cables
Before testing: Provide proper isolation, PST awareness checklist checked off, work permit, schematics
- Verify I/O
- Metering check: verify analog-to-digital converter (inject balanced I/V, compare to metered values of relay, verify CT/PT ratios)
- Verify relay settings, time/date
- Verify passwords
- Force output contact/verify input contact
0400-0347
Testing Electric Circuits
- Required at new installation or where modifications have taken place
AC:
- Point-to-point wire checks: buzzer
- Insulation resistance: use megger (high V, low I), disconnect form ground, apply V. Minimum is CE-ES-1002
DC (control, power, alarm, Sequence of Event Recorders, oscillograph, annunciator):
- Insulation resistance
- Operational
- Polarity (oscillograph inputs)
0400-0402
Testing Guidelines for Commissioning Equipment
AC
- Wire checks
- Insulation resistance
- Circulating current (read with phase angle meter)
- Primary injection
- Load readings (phase angle meter)
DC
- Trip/operational
- Insulation resistance
Relays
- Test plans, I/O, analog-to-digital
CT/PT
CT: Ratio, polarity, insulation resistance, saturation (CT)
PT: ratio, polarity
Communication Circuits, Alarms, Indications
0400-0345
Performing Trip and Operational Tests at Area Substations
- Isolate
- Local trip tests/full trip test
- Verify breaker failure timers
- Transfer trip
- AGS/CS
0400-0437
Startup/shutdown trips
0400-0401
Guidelines for Primary Injection Testing
Unbalanced/balanced
0400-0108
Testing Multi-Contact Auxiliary Relays
- Self reset, manual reset, electrical reset
- Insulation resistance, mechanical inspection, trip/reset coil R, minimum pickup, operating times
Etc.
0400-0316
Working Near Electrical Equipment in Substations
- Isolate from all sources of supply (including backfeed) before testing
- Adequate clearance: Blue Book
- When working on in-service equipment, discuss possibility of inadvertent trip out with operator
Before signing Work Permit, verify that protection has been provided by Substation Operator
0300-0030
Types of permits
Work Permits and Test Permits
Work permit: Permission granted to permit work or test on equipment. Verbal may be issued to PST for in-service work
Test permit: Permission for employees not normally working in substations to apply V to dead equipment
Electrical permit: work on electrical equipment
Mechanical permit: steam/water/oil/insulating or dielectric fluid, etc
Area permit: area where structural, construction, alteration, excavation or demolition work
Authorized Employee
A person certified by department manager as meeting minimum requirement to hold work or test permit.
Maintained in SSO website
0300-0030
Ground Level Only
Substation Ops where people/equipment/tools not working within minimum approach of non-protected electrical conductors
0300-0030
Provide own Isolation
In-service and out-of-service: PST isolate relay circuits as necessary
0300-0030
When permits needed
Work which requires contact (may result in contact) with current-carrying electrical equipment
0300-0030
Multiple work permits?
Once work permit issued for one group, no other permits may be issued if that work would interfere or alter protection for first group
If possible to have multiple, Substation Operator coordinates
0300-0030
Issuing work permit
Substation Operator&authorized employee discuss scope of work, review protection, walk-down protection with permit.
All employees on site discuss scope of work with HTOD.
All employees do job briefing
All employees sign form
0300-0030
Work permit software
ISWP: In Service Work Permit system
Notify system operation department (6 hours normally)
0300-0030
Verbal Work Permit
If no Substation Operator.
PST tech calls Shift Manager, enters info in log
PST tech contact DO, request verbal
End of shift: return work permit to DO, calls shift manager
0300-0030
Transfer work permit
Planned work not completed end of shift, equipment cannot be returned to service
Transfer the permit to the Substation Operator
0300-0030
Open Work Permit
For long-term project, working group does not need to sign off every day. Must log in substation log though
Need to re-walk down the protection each shift through
0300-0030
