Hi Pot Training

BV CPS-I TM E02 Revision: 01

Hi-pot Test Training

Reference: UL153

For the benefit of business and people

Prepared By: Emily Tang / Ada Ge Date:

Approved By: Herbert Zhu Date: Jan.19, 05

“BUREAU VERITAS PROPRIETARY – copyright Bureau Veritas [2004] – DO NOT DISCLOSE OUTSIDE YOUR ORGANISATION WITHOUT BUREAU VERITAS PRIOR WRITTEN CONSENT”.

2“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

3“BUREAU VERITAS PROPRIETARY – copyright Bureau Veritas [2004] – DO NOT DISCLOSE OUTSIDE YOUR ORGANISATION WITHOUT BUREAU VERITAS PRIOR WRITTEN CONSENT”.

Hi-pot Test Purpose

�Check the insulation according with safety requirement.

Why do High-pot testWhy do High-pot test

4

Hi-pot test circuit

v L Inspected sample

Current tester

Alarm system

Probe with Hi- pot

Another probe

High-pot test circuitHigh-pot test circuit


5

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.

High-pot test circuitHigh-pot test circuit


6

�Equipment: Hi-pot tester

Operation procedureOperation procedure


7

Operation procedureOperation 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.

Verification


8

�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

Operation procedureOperation procedureWhere need do


9

Setting dataTest Voltage Knob

Start button

Stop button

LED display

Operation procedureOperation procedureSetting equipment


10

Procedure

�Step A : set up the tester at appropriate breakdown current limit and appropriate voltage(below value for reference only)

Start test Operation procedureOperation procedure


11

�Step B : all of the switch and setting on the sample should be placed at ON and at MAX which appropriate

Operation procedureOperation procedureStart test


12

�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.



13

�Step D : connect opposite polarity of tester to accessible metal part, earth pin or earth lead wire, press start button,then maintain 1 second



14

Operation procedureOperation procedureStart test


15

�After the test, no breakdown or flashover shall occur; in the meantime pay attention to the voltage displays on Hi-pot tester to ensure the voltage will not drop down.

Operation procedureOperation procedureEstimation

Voltage drop downAlarm


16

�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.

Operation procedureOperation procedureNotice


17

�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.

Safety caution Operation procedureOperation procedure


18

Correct action Correct action

Operation procedureOperation procedureSafety caution

Wrong action Wrong action


19

How to present the result?How to present the 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.


20

END


Documents

Hi Pot Training