View the board with the CTs near you and the shield on the left
3.3 Basic Protection
3.3.9 Recloser Element 79 (O I)
After a fault trips open the recloser or circuit breaker, the 79 Reclosing Element closes the unit when the programmed open time interval expires. One to five operations (four recloses) may be selected, and each reclose has its own open interval timer.
The reset timer begins timing down from the Reset Time setting to zero after each reclosure, provided the phase and ground currents are below the lowest pickup setting of all the elements.
At each step in the reclose sequence, you can enable or disable the 50P-1, 50P-2, 50P-3, 51N, 50N-1, 50N-2 or 50N-3 elements or set the element to lockout reclosing as a result of tripping on any one of these elements. Disable the reclosing element in the Primary, Alt 1 and Alt 2 Settings by selecting LOCKOUT for the first Reclose Open Interval Time.
A lockout state occurs under any of the following conditions:
• A fault persists for the entire programmed reclosing sequence.
• The unit is manually closed and a fault occurs before the expiration of the reset timer.
• A TRIP occurs and the fault current is not removed or the 52A and 52B contacts do not indicate that the unit opened. Both the removal of the fault current and the opening of the unit must occur before the Breaker Failure Timer (5 to 60 cycles) expires, or the PCD will proceed to lockout.
• The recloser element is programmed to LOCKOUT after one (51P, 50P-1, 50P-2, 50P-3, 51N, 50N-1, 50N-2, 50N-3, 67P or 67N) overcurrent trip.
• The 79V element is enabled, the bus voltage is below the voltage block setting, and the block time delay has expired.
• A Reclose Block is activated from the HMI or via SCADA and an overcurrent trip occurs.
• In addition to a front panel target (LED) indication that the unit is in the Lockout State, a programmable lockout alarm (79LOA) contact is available. The Lockout State is cleared when the 52A and 52B contact inputs indicate that the unit has been manually closed and the reset time has expired.
Figure 3-1. Recloser Sequence
79-1
50P-1 50P-2 50P-3 51N 50N-1 50N-2 50N-3
79-2..5
ABB Power Control Device 3 Protection
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Table 3-15. 79 (O I) Element Settings
79 (O I) Setting Description
Reclose Mode Default three-phase or PCD with the single-phase tripping and reclosing option, this setting specifies the tripping mode three-phase or single-phase (OPUP or OOAP). See Section 11. This is a configuration setting.
79 Reset Time Specification of the recloser reset time. The setting range is 3 to 200 seconds increment 1 second.
Specifies which protective elements are active and how each is to operate during Step 1 of the reclose sequence.
• Disabled (not an option for 51P)
• Enabled
• Lockout
• Alarm. Alarm has no effect on the reclose sequence, but allows alarm logical outputs to operate (not an option for 51P)
PCDs ordered with the single-phase tripping option, the choices are:
• Disable (not an option for 51P)
• Enable with single-phase operation
• Enable with three-phase operation
• Lockout with single-phase operation
• Lockout with three-phase operation
• Alarm. Alarm has no effect on the reclose sequence, but allows alarm logical outputs to operate (not an option for 51P)
79-1 Open Interval Time Specification of the Step 1 open interval time. The setting range is 0.1 to 200 seconds increment 0.1 second.
79-2 Select Specification of whether Step 2 reclosing is enabled or disabled.
79-2 Mode Select: 51P
Specifies which protective elements are active and how each is to operate during Step 2 of the reclose sequence.
• Disabled (not an option for 51P)
• Enabled
• Lockout
• Alarm. Alarm has no effect on the reclose sequence, but allows alarm logical outputs to operate (not an option for 51P)
PCDs ordered with the single-phase tripping option, the choices are:
• Disable (not an option for 51P)
• Enable with single-phase operation
• Enable with three-phase operation
• Lockout with single-phase operation
• Lockout with three-phase operation
• Alarm. Alarm has no effect on the reclose sequence, but allows alarm logical outputs to operate (not an option for 51P)
79-2 Open Interval Time Specification of the Step 2 open interval time. The setting range is 0.1 to 200 seconds increment 0.1 second.
79-3 Select Specification of whether Step 3 reclosing is enabled or disabled.
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Table 3-15. 79 (O I) Element Settings
79 (O I) Setting Description 79-3 Mode Select: 51P
Specifies which protective elements are active and how each is to operate during Step 2 of the reclose sequence.
• Disabled (not an option for 51P)
• Enabled
• Lockout
• Alarm. Alarm has no effect on the reclose sequence, but allows alarm logical outputs to operate (not an option for 51P)
PCDs ordered with the single-phase tripping option, the choices are:
• Disable (not an option for 51P)
• Enable with single-phase operation
• Enable with three-phase operation
• Lockout with single-phase operation
• Lockout with three-phase operation
• Alarm. Alarm has no effect on the reclose sequence, but allows alarm logical outputs to operate (not an option for 51P)
79-3 Open Interval Time Specification of the Step 3 open interval time. The setting range is 0.1 to 200 seconds increment 0.1 second.
79-4 Select Specification of whether Step 4 reclosing is enabled or disabled.
79-4 Mode Select: 51P
Specifies which protective elements are active and how each is to operate during Step 2 of the reclose sequence.
• Disabled (not an option for 51P)
• Enabled
• Lockout
• Alarm. Alarm has no effect on the reclose sequence, but allows alarm logical outputs to operate (not an option for 51P)
PCDs ordered with the single-phase tripping option, the choices are:
• Disable (not an option for 51P)
• Enable with single-phase operation
• Enable with three-phase operation
• Lockout with single-phase operation
• Lockout with three-phase operation
Alarm. Alarm has no effect on the reclose sequence, but allows alarm logical outputs to operate (not an option for 51P)
79-4 Open Interval Time Specification of the Step 4 open interval time. The setting range is 0.1 to 200.0 seconds increment 0.1 second.
79-5 Select Specification of whether Step 5 reclosing is enabled or disabled.
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Table 3-15. 79 (O I) Element Settings
79 (O I) Setting Description 79-5 Mode Select: 51P
79-5 Mode Select: 50P-1 79-5 Mode Select: 50P-2 79-5 Mode Select: 50P-3 79-5 Mode Select: 51N 79-5 Mode Select: 50N-1 79-5 Mode Select: 50N-2 79-5 Mode Select: 50N-3 79-5 Mode Select: 46 79-5 Mode Select: 67P 79-5 Mode Select: 67N
Specifies which protective elements are active and how each is to operate during Step 2 of the reclose sequence.
• Disabled (not an option for 51P)
• Enabled
• Lockout
• Alarm. Alarm has no effect on the reclose sequence, but allows alarm logical outputs to operate (not an option for 51P)
PCDs ordered with the single-phase tripping option, the choices are:
• Disable (not an option for 51P)
• Enable with single-phase operation
• Enable with three-phase operation
• Lockout with single-phase operation
• Lockout with three-phase operation
Alarm. Alarm has no effect on the reclose sequence, but allows alarm logical outputs to operate (not an option for 51P)
79-5 Open Interval Time The setting range is Lockout only.
79 Cutout Time Specification of the recloser cutout time (see page 87). The setting range is 1 to 200 seconds increment 1 second.
79V Select Specification of whether the 79V element is enabled or disabled.
79 Pickup Voltage Specification of the 79V element’s pickup voltage. The setting range is 10 to 200 volts AC, increment 1 volt.
79V Time Delay Specification of the 79V element’s time delay voltage. The setting range is 4 to 200, increment 1. (See next setting concerning the units used.) 79V Timer Mode Specification of whether the 79V-time delay is in second or minutes.
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