BV CPS-I TM E02 Revision: 01
Hi-pot Test Training
Reference: UL153
Prepared By:
Emily Tang / Ada Ge
Approved By: Herbert Zhu
Date:
Date: Jan.19, 05
For the benefit of business and people
“BUREAU VERITAS PROPRIETARY – copyright Bureau Veritas [2004] – DO NOT DISCLOSE OUTSIDE YOUR ORGANISATION
WITHOUT BUREAU VERITAS PRIOR WRITTEN CONSENT”.
Training Objectives
Training Objective
• To understand why do Hi-pot test
• To know of basic knowledge of Hi-pot test circuit
• To understand operation procedure of Hi-pot test
• To understand how to present the result
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2
Why
Why do
do High-pot
High-pot test
test
Hi-pot Test Purpose
Check the insulation according with
safety requirement.
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3
High-pot
High-pot test
test circuit
circuit
Hi-pot test circuit
Probe with Hi- pot
v
L
Inspected sample
Another probe
Current tester
Alarm
system
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4
High-pot
High-pot test
test circuit
circuit
Explain of Hi-pot test circuit
The test equipment include a transformer having a
sinusoidal output,for our inspection this voltage is
adjusted to the voltage required in protocol.
A current tester system is existed in the equipment to
calculate breakdown current, for our inspection we must
set up limited of breakdown current which is obtained
form protocol.when calculated current out of limit, alarm
system will cut off voltage output and alarm.
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5
Operation
Operation procedure
procedure
Equipment: Hi-pot tester
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6
Verification
Operation
Operation procedure
procedure
Verify the equipment
Check this tester visually for any physical damage,
correctly/promptly connection and suitable power
source.
Turn the Power Switch to ON, turn the voltage to the
lowest position.
Press the “Start” button, and set the voltage at a low
value.
Short circuit the two probes, alert activate, OK. If no alert
activate, try to ask the factory change another tester.
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7
Where need do
Operation
Operation procedure
procedure
First internal check product to detect construction
and determine where need to conduct Hi-pot test:
All accessible metal part ready to become live
during normal operation (see note i)
Output of transformer or adaptor
Assemble gap
Note I: normal operation including:
a) Replacing a lamp;
b) Removal or cleaning of all parts not secured
by use of tools
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8
Setting equipment
Operation
Operation procedure
procedure
Setting data
Test Voltage Knob
Start button
Stop button
LED display
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9
Operation
Operation procedure
procedure
Start test
Procedure
Step A : set up the tester at appropriate
breakdown current limit and appropriate
voltage(below value for reference only)
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10
Start test
Operation
Operation procedure
procedure
Step B : all of the switch and setting on
the sample should be placed at
ON and at MAX which appropriate
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WITHOUT BUREAU VERITAS PRIOR WRITTEN CONSENT”.
11
Start test
Operation
Operation procedure
procedure
Step C : connect live & neutral plug pin
or lead wire together to the
either polarity of test,otherwise
checking should be conducted
on each of them.
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WITHOUT BUREAU VERITAS PRIOR WRITTEN CONSENT”.
12
Start test
Operation
Operation procedure
procedure
Step D : connect opposite polarity of
tester to accessible metal part, earth pin
or earth lead wire, press start button,then
maintain 1 second
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WITHOUT BUREAU VERITAS PRIOR WRITTEN CONSENT”.
13
Start test
Operation
Operation procedure
procedure
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WITHOUT BUREAU VERITAS PRIOR WRITTEN CONSENT”.
14
Estimation
Operation
Operation procedure
procedure
After the test, no breakdown or flashover shall occur; in
the meantime pay attention to the voltage displays on Hipot tester to ensure the voltage will not drop down.
Alarm
Voltage drop down
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15
Notice
Operation
Operation procedure
procedure
Hi-pot test time must keep on 1 second,do not only strike
probe on inspected sample.
When Hi-pot test is failed at required breakdown current
on protocol,try to recheck with max setting of equipment
and call back to office.
For European product, sometimes different voltage will
be applied on product, for example class I product with
class II construction, these two type of class need
different voltage.
Since output voltage of Hi-pot tester is always exceed
1000V, all operation must obey safety rule.
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WITHOUT BUREAU VERITAS PRIOR WRITTEN CONSENT”.
16
Safety caution
Operation
Operation procedure
procedure
Turn off Hi-pot tester when you need not to use
For safety reason, remember to turn off switch
before you conduct function check.
When you do Hi-pot test,keep any part of you
body away form product, especially don’t touch
product which being conducted Hi-pot test.
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WITHOUT BUREAU VERITAS PRIOR WRITTEN CONSENT”.
17
Safety caution
Wrong action
Correct action
Operation
Operation procedure
procedure
Wrong action
Correct action
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WITHOUT BUREAU VERITAS PRIOR WRITTEN CONSENT”.
18
How
How to
to present
present the
the result?
result?
If breakdown was found, visual check the product and
find the reason (needn’t to open the unit), then record
the defect as critical defect. For example:
Hi-pot test was failed when test on lampholder at
1200Vac,30mA (max setting of Hi-pot tester)
Note: Both workmanship and on site test should be failed
on this case.
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END
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20