0:00
hey everyone let's focus today on how
0:01
overvoltage damages motor insulation and
0:04
leads to burnout excess voltage is one
0:07
of the fastest ways to destroy a motor
0:09
especially if the system lacks proper
0:11
protection how overvoltage damages
0:13
insulation and burns out motors electric
0:16
motors are designed with a specific
0:18
voltage rating and their insulation
0:20
system is built to withstand only a
0:22
limited amount of electrical stress when
0:25
voltage exceeds this limit the
0:26
insulation starts to break down setting
0:28
off a chain reaction that can lead to
0:30
complete motor failure here's what
0:32
happens when overvoltage occurs
0:34
increased electrical stress on
0:36
insulation insulation in motor windings
0:39
is designed for specific dialectric
0:41
strength when the voltage goes beyond
0:43
the rated value the insulation
0:45
experiences excessive electrical stress
0:47
causing it to weaken over time excessive
0:50
heating and thermal runaway higher
0:52
voltage leads to increased current in
0:54
the windings generating excessive heat
0:57
since insulation materials degrade
0:59
faster at high temperatures this
1:00
accelerates failure if the motor does
1:03
not have sufficient cooling this can
1:04
quickly lead to thermal runaway a
1:06
condition where the heat keeps
1:08
increasing until the insulation
1:10
completely fails breakdown of winding
1:12
coatings and motor burnout over time the
1:15
insulation on the copper windings
1:17
deteriorates exposing the bare
1:19
conductors this results in interturn
1:21
shorts phaseto-phase faults or phase to
1:24
ground faults if left unchecked these
1:26
faults cause an immediate spike in
1:28
current leading to motor burnout the
1:30
classic fried windings failure mode what
1:33
causes overvoltage over voltage doesn't
1:36
just happen randomly here are some
1:38
common culprits power surges from the
1:40
grid sometimes the electricity company
1:43
cranks up the voltage without warning
1:45
your motor it just has to deal with it
1:47
lightning strikes if lightning hits
1:49
nearby you can bet that your electrical
1:51
system is getting a voltage spike bad
1:54
wiring or transformer issues ever
1:56
connected a 400V motor to a 480V supply
1:59
that's a disaster waiting to happen
2:01
human errors in motor connection
2:03
mistakes in wiring can lead to severe
2:05
overvoltage damage some common errors
2:07
include connecting a 120V rated motor to
2:10
a 220V supply can instantly burn out the
2:13
windings the role of overvoltage
2:16
protection if a motor circuit has a
2:18
proper overvoltage protection system it
2:20
should detect and mitigate excessive
2:22
voltage before it can cause damage this
2:25
includes surge arresters and suppressors
2:27
to absorb transient voltage spikes
2:30
voltage monitoring relays that shut down
2:32
the motor if voltage exceeds a safe
2:35
threshold however if a circuit lacks
2:37
protection or if the protection system
2:39
fails then overvoltage will affect the
2:41
motor the extent of the damage depends
2:44
on two factors voltage magnitude a
2:47
slight overvoltage may cause gradual
2:48
insulation wear but a severe overvoltage
2:51
can lead to immediate failure duration
2:53
of overvoltage short-term overvoltage
2:56
may cause temporary overheating but
2:58
prolonged exposure significantly weakens
3:00
insulation and increases the risk of
3:02
total burnout preventing overvoltage
3:05
damage to protect motors from insulation
3:07
failure and burnout due to overvoltage
3:10
consider these best practices ensure the
3:13
motor circuit has reliable overvoltage
3:15
protection regularly test protective
3:17
devices to ensure they are functioning
3:19
correctly monitor voltage levels using
3:22
power quality meters or voltage
3:24
monitoring relays to detect sustained
3:26
overvoltage conditions properly size and
3:29
maintain surge protection devices to
3:31
handle transient voltage spikes
3:33
effectively check transformer tap
3:35
settings to ensure the supply voltage
3:37
matches the motor rating regular
3:39
insulation resistance testing to detect
3:41
early signs of insulation degradation
3:44
before failure occurs final thoughts
3:47
overvoltage is one of the most dangerous
3:49
conditions for electric motors because
3:50
it directly attacks the insulation
3:52
system leading to failure and burnout
3:55
while a good protection system should
3:57
prevent damage a lack of protection or a
3:59
failed protective device means the motor
4:01
is at risk the higher the over voltage
4:04
and the longer it lasts the faster the
4:06
insulation breaks down and the sooner
4:08
the motor will fail have you encountered
4:10
a motor failure due to overvoltage what
4:13
protection methods do you use in your
4:14
circuits let's discuss
