KYORITSU 6315 Instruction Manual - Manual (Page 117)

Factors impair power quality and symptoms KEW6315
- 115 - KEW6315
Power quality Waveform Symptom Adverse effect
Transient,
Over-voltage
(impulse)
Contact failure at a circuit
breaker, magnet or relay.
Damage to a power source
or reset of the device may
occur due to a drastic
voltage fluctuation (spike).
Inrush current
Instantaneous large currents
(surge) flow on devices with a
motor, incandescent lamp and
flat capacitor when powering
them on.
Influences on welded
contacts for Power switch,
blowing fuse, trip on
breaker, rectifier circuit
and fluctuations in power
supply voltage may occur.
Unbalance
rate
Heavy loading on specific
phase due to fluctuations in
load of power line or drastic
extension of installations.
Distortions of voltage / current
waveforms, dip and negative
sequence voltages are caused.
Influences on voltage,
current, motor operation
occur; negative sequence
voltage and harmonics
occur.
Flicker
Too much load is caused on
certain phases due to increase
and decrease of the loads
connected to each phase such
as supply lines or heavy use of
specific equipments, as a
result, distortions on voltage
and current waveforms, dip
and reversed voltages are
observed.
Unbalanced or reversed
voltages and harmonics
occur and result in motor
instability, trip of 3E circuit
breaker or heating due to
overload.
RMS
RMS