subject: The Particular Dielectric Effort Withstand Check Connected With Electrical Gear [print this page] Almost all styles of safety requirements of ac electronic load gear are required to consider the dielectric voltage withstand test, which signifies that this kind of check is an essential part of safety standards for electric gear. The dielectric voltage withstand test also known as high voltage check will be a requirement imposed on high-voltage AC for your equipment to make sure that the insulating material in the equipment and area length meet the requirement of the test.
one.The approaches in the test
(one) Check that the switch of primary power supply in the hipot tester is within the condition of turning off.
(two)All the non-conductive metal parts must remain grounded except the unique design in the instrument.
(3) Connect all the lines of power provide input ends or terminals in the examined gear.
(four) Maintain the ability supply switches and energy relay closed.
(five) Modify the screening voltage of hipot tester to zero.
(six) Make the red higher voltage output lines of the hipot tester connect the power supply input ends of the examined equipment.
(seven) Make the black circuit ground lines link using the touchable and non-conductive metal components.
(8) Close the primary energy provide switch of the electrical safety tester and enhance gradually the secondary voltage in the hipot tester to satisfy the necessity. The boosting rate does not exceed five hundred V/sec.
(nine) Preserve the screening voltage throughout a specified time period.
(ten) Drop the testing voltage slowly.
(11) Reduce off the primary energy change in the hipot tester. Reduce off the high voltage output lines, after which reduce from the circuit floor lines of hipot tester.
two. Sometimes during the check, the voltage can't reach the required voltage value and drop contrarily, or the hipot tester seems warning signal. When the over situations occur, the tested equipment doesn't pass the test. It will have to be particularly cautious once the gear is examined, because throughout the entire process of the check, there may be high voltage which can be harmful for human.
three. Factories can avoid the dielectric voltage withstand check for his or her products once the subsequent conditions exist.
(one) The power input of the items is elv of their secondary output or selv, i.e. energy provide or transformer.
(2) Additional power provide which can be needed to become a element for the completed item is certified by CSA, with an entire shell and input and output connectors. As the energy supply is licensed from the CSA, and it is examined from the dielectric voltage withstand check. Therefore the dielectric voltage withstand test for the product is considered to be staying away from. But it must be mentioned that the item must be checked before putting in its power. Once the signal voltage transformers are used in the lines using the same voltage and are not regarded as security gadgets, the dielectric voltage withstand check may be averted.
4. The subsequent points are needed to spend unique attention:
(one) The instrument really should be operated by trained and approved individuals.
section two A set and distinct warning signs should be placed around the region of screening to stop other persons from getting into the dangerous area.
(three) All of the individuals, including the operators should certainly refrain from testing instrument and examined gear when it's tested. Prohibit touch the output line once the test instrument is began.
