Schweitzer Engineering Laboratories SEL-352-1 - Synchronism Check Element; Voltage Elements

Date Code 20010731 Introduction and Specifications 1-13
SEL-352-1, -2 Instruction Manual
Voltage Elements
87H/87FO/87TH Voltage Across Breaker Overvoltage Elements
setting range ........................................................................ 1.0–150.0 V secondary, 0.1-V steps
pickup time.................................................................................................. less than 1.35 cycles
dropout time................................................................................................ less than 1.55 cycles
pickup and dropout.................................................................±0.09 V secondary ±5% of setting
transient overreach ............................................................................................... ±5% of setting
X47Q/Y47Q Negative-Sequence Overvoltage Element
setting range ........................................................................ 2.0–140.0 V secondary, 0.1-V steps
pickup time.................................................................................................. less than 1.35 cycles
dropout time................................................................................................ less than 1.55 cycles
pickup and dropout.................................................................±0.27 V secondary ±6% of setting
transient overreach ............................................................................................... ±5% of setting
X59H High-Set Overvoltage Element
setting range ........................................................................ 1.0–130.0 V secondary, 0.1-V steps
pickup time.................................................................................................. less than 1.35 cycles
dropout time................................................................................................ less than 1.55 cycles
pickup and dropout.................................................................±0.09 V secondary ±5% of setting
transient overreach ............................................................................................... ±5% of setting
X27D/Y27D Dead Line Undervoltage Element
setting range ........................................................................ 1.0–120.0 V secondary, 0.1-V steps
pickup time.................................................................................................. less than 1.35 cycles
dropout time................................................................................................ less than 1.55 cycles
pickup and dropout.................................................................±0.09 V secondary ±5% of setting
transient overreach ............................................................................................... ±5% of setting
X59L/Y59L Live Line Overvoltage Element
setting range ...................................................................... 10.0–120.0 V secondary, 0.1-V steps
pickup time.................................................................................................. less than 1.35 cycles
dropout time................................................................................................ less than 1.55 cycles
pickup and dropout.................................................................±0.09 V secondary ±5% of setting
transient overreach ............................................................................................... ±5% of setting
Synchronism Check Element
25SC/25SM Maximum Slip Frequency for Controlled/Manual Close
setting range ..............................................................................0.005–0.500 Hz, 0.001-Hz steps
pickup and dropout..............................................................................±0.002 Hz ±2% of setting
25AC Maximum Controlled Close Angle
setting range .....................................................................................................32·(25SC) to 90°,
min = 1°, 0.1° steps
pickup and dropout......................................................................................±0.5
 ±5% of setting
25AM Maximum Manual Close Angle
setting range .................................................................................................... 32·(25SM) to 90°,
min = 1°, 0.1° steps
pickup and dropout......................................................................................±0.5 ±5% of setting