Schweitzer Engineering Laboratories SEL-352-1 - Breaker Resistor Thermal Elements; Current Unbalance Element; Overpower Elements; Settable Timers

1-14 Introduction and Specifications Date Code 20010731
SEL-352-1, -2 Instruction Manual
Current Unbalance Element
46P Phase Current Unbalance Element
46P detects phase discordance when the protected breaker closes. For example, A-phase is
unbalanced if phase current is above the 50LD setting in one or more phases and:
|IA| < ( |IA| + |IB| + |IC| ) / 46UB setting where 46UB setting = 8, 16, 32, or 64.
Time to stabilize measurement
due to transient conditions .......................................................................... less than 1.35 cycles
Overpower Elements
37OP Breaker Overpower Element
setting range............................................ 0.10–3400.00 W secondary, 0.01-W steps (I
nom
= 5 A)
.................................................................. 0.02–680.00 W secondary, 0.01-W steps (I
nom
= 1 A)
pickup time.................................................................................................. less than 2.10 cycles
dropout time................................................................................................ less than 3.00 cycles
maximum element error, secondary units:
±2.25 mW ±10.25% (measured input power)
±2.63% (measured voltage) ±9.45% (measured current)
Breaker Resistor Thermal Elements
26CF Close Resistor Failure Element
26CP Close Resistor Pending Failure Element
26TF Trip Resistor Failure Element
26TP Trip Resistor Pending Failure Element
setting range .................................. 0.010–1000.000 Joules secondary, 0.001 J-steps (I
nom
= 5 A)
........................................................ 0.002–200.000 Joules secondary, 0.001 J-steps (I
nom
= 1 A)
pickup error is based on 37OP element over time
Settable Timers
SYNCT Synchronizing Time Dropout (SYNCdo)
setting range .....................................................................0.00–99999.00 cycles, 1/4-cycle steps
pickup setting ......................................................................... ±0.25 cycles or ±0.25% of setting
62TT Failure-to-Trip Fault Current Trip Input Timer
62FC Failure-to-Trip Fault Current Failure Timer
62T1 General Purpose Timer 1
62M2 Maximum Bus Clearing Time
62M3 Maximum MOD Operate Time
setting range ...........................................................................0.0–8191.0 cycles, 1/8-cycle steps
pickup setting ....................................................................... ±0.125 cycles or ±0.25% of setting
SCT Synchronous Close Timer (CLSdo)
62LD Failure-to-Trip Load Current Failure Timer
62LP Failure-to-Trip Load Current Pending Failure Timer
62AF Failure of Breaker 52A Contact to Indicate Operation Failure Timer
62AP Failure of Breaker 52A Contact to Indicate Operation Pending Failure Timer
62FF Flashover Failure Timer
62FP Flashover Pending Failure Timer
62UC Phase Discordance Close Input Pickup Timer
62OP Trip and Close Resistor Heating Pickup Timer