Full copy of Standard PRC-005-2
NERC PRC-005 requirements for battery maintenance when no monitoring
Table 1-4(a)
Protection System Station dc Supply Using Vented Lead-Acid (VLA) Batteries
Maximum Interval |
Maintenance Activities |
4 Calendar Months |
Verify:
Inspect:
|
18 Calendar Months |
Verify:
Inspect:
|
18 Calendar Months -or- 6 Calendar Years |
Verify that the station battery can perform as manufactured by evaluating cell/unit measurements indicative of battery performance (e.g. internal ohmic values or float current) against the station battery baseline. -or- Verify that the station battery can perform as manufactured by conducting a performance or modified performance capacity test of the entire battery bank. |
Table 1-4(b)
Protection System Station dc Supply Using Valve-Regulated Lead-Acid (VRLA) Batteries
Maximum Interval |
Maintenance Activities |
4 Calendar Months |
Verify:
Inspect:
|
6 Calendar Months |
Inspect:
|
18 Calendar Months |
Verify:
Inspect:
|
6 Calendar Months -or- 3 Calendar Years |
Verify that the station battery can perform as manufactured by evaluating cell/unit measurements indicative of battery performance (e.g. internal ohmic values or float current) against the station battery baseline. -or- Verify that the station battery can perform as manufactured by conducting a performance or modified performance capacity test of the entire battery bank. |
Table 1-4(C)
Protection System Station dc Supply Using Nickel-Cadmium (NiCad) Batteries
Maximum Interval |
Maintenance Activities |
4 Calendar Months |
Verify:
Inspect:
|
18 Calendar Months |
Verify:
Inspect:
|
6 Calendar Years |
Verify that the station battery can perform as manufactured by conducting a performance or modified performance capacity test of the entire battery bank. |
NERC PRC-005 requirements for battery maintenance when effective monitoring is implemented
Monitoring Parameters |
BatteryDAQ |
Component Attributes |
Maintenance Activities |
String Voltage |
Yes |
Any station dc supply with high and low voltage monitoring and alarming of the battery charger voltage to detect charger over-voltage and charger failure. |
No periodic verification of station dc supply voltage is required. |
Electrolyte Level |
Optional |
Any battery based station dc supply with electrolyte level monitoring and alarming in every cell. |
No periodic inspection of the electrolyte level for each cell is required. |
Ground Fault |
With GF-100 Ground Fault Detector |
Any station dc supply with unintentional dc ground monitoring and alarming. |
No periodic inspection of unintentional dc grounds is required. |
Cell Voltage |
Yes |
Any station dc supply with charger float voltage monitoring and alarming to ensure correct float voltage is being applied on the station dc supply. |
No periodic verification of float voltage of battery charger is required. |
String Connection |
Yes |
Any battery based station dc supply with monitoring and alarming of battery string continuity. |
No periodic verification of the battery continuity is required. |
Inter-cell Resistance |
Yes |
Any battery based station dc supply with monitoring and alarming of the inter-cell and/or terminal connection detail resistance of the entire battery. |
No periodic verification of the intercell and terminal connection resistance is required. |
Internal Resistance Or float current |
Yes |
Any Valve Regulated Lead-Acid (VRLA) or Vented Lead-Acid (VLA) station battery with internal ohmic value or float current monitoring and alarming, and evaluating present values relative to baseline internal ohmic values for every cell/unit. |
No periodic evaluation relative to baseline of battery cell/unit measurements indicative of battery performance is required to verify the station battery can perform as manufactured. |
Internal Resistance |
Yes |
Any Valve Regulated Lead-Acid (VRLA) or Vented Lead- Acid (VLA) station battery with monitoring and alarming of each cell/unit internal ohmic value. |
No periodic inspection of the condition of all individual units by measuring battery cell/unit internal ohmic values of a station VRLA or Vented Lead-Acid (VLA) battery is required. |