Oil-Type Dry-Type Gas-Type Testing Transformer AC DC Hipot Tester

• After-sales Service: Lifetime Technical Support
• Warranty: 1 Year for Testing Transformer AC DC Hipot Tester
• Type: Testing Transformer AC DC Hipot Tester
• Accuracy Grade: 1
• Load Way: Electronic Load
• Loading Method: Dynamic Load
• Model NO.: GDJ
• Display: Digital
• Control: Digital Control
• Weight: 0-100Kg
• Power Source: AC220V
• Product Name: Test Transformer 100kv AC DC Hipot Tester
• Application: Oil-Type Dry-Type Gas-Type Hipot Tester
• Usage: Hipot Tester
• Standard: T-9641-1999
• Hi-Pot Tester Capacity: 1.5kVA-300kVA
• Transformer Type Optional: AC Type, DC Type or AC DC
• Hi-Pot Tester Type: Oil Type, Oil-Immersed Transformer
• Control Cambinet Features: Reasonable Structure, Small
• Transport Package: Wooden Case
• Specification: As different size
• Trademark: GOLD
• Origin: Chongqing, China
• HS Code: 9031809090
• Production Capacity: 200PCS/Month

Product Description

Oil-type Dry-type Gas-type Testing Transformer AC DC Hipot Tester

Product Parameters

Capacity	GDJZ-50 Series		GDJZ-100 Series		GDJZ-150 Series
KVA	AC	DC	AC	DC	AC	DC
3kVA	50KV	70KV
5kVA	50KV	70KV	100KV	140KV
10kVA	50KV	70KV	100KV	140KV	150kV	210KV
15kVA	50KV	70KV	100KV	140KV	150kV	210KV
20kVA	50KV	70KV	100KV	140KV	150kV	210KV
25kVA	50KV	70KV	100KV	140KV	150kV	210KV
30kVA	50KV	70KV	100KV	140KV	150kV	210KV
50kVA	50KV	70KV	100KV	140KV	150kV	210KV

A transformer hipot tester is a type of high potential (high voltage) test used to verify the capability of insulation to withstand a specified voltage without electrical breakdown, also known as a Dielectric Withstand Voltage (DWV) test. The objective is to ensure the insulation can withstand more than the expected working voltage by a sufficient margin.

Hipot testing is a nondestructive test that determines the adequacy of electrical insulation for the normally occurring overvoltage transient. It is applied to all devices for a specific time to ensure that the insulation is not marginal. Hipot tests are helpful in finding nicked or crushed insulation, stray wire strands or braided shielding, conductive or corrosive contaminants around the conductors, terminal spacing problems, and tolerance errors in cables. 

The basic test voltage for the hipot test is 2X (operating voltage) + 1000 V. The reason for using 1000 V as part of the basic formula is that the insulation in any product can be subjected to normal day-to-day transient overvoltages, which can be as high as 1000 V.

Hipot testing can be performed using either DC or AC voltage. One advantage of using a DC test voltage is that the leakage current trip can be set to a much lower value than that of an AC test voltage, allowing a manufacturer to filter those products that have marginal insulation, which would have been passed by an AC tester. However, it is a good practice to always ensure that a product is discharged, regardless of the test voltage or its nature, before it is handled.
 

Test Process

 

The step-by-step process for hipot testing includes the following: 

• Only electrically qualified workers may perform this testing.
• Open circuit breakers or switches to isolate the circuit or cable that will be hi-pot tested.
• Confirm that all equipment or cable that is not to be tested is isolated from the circuit under test.
• The limited approach boundary for this hi-pot procedure at 1000 volts is 5 ft. (1.53m) so place barriers around the terminations of cables and equipment under test to prevent unqualified persons from crossing this boundary.
• Connect the ground lead of the HIPOT Tester to a suitable building ground or grounding electrode conductor. Attach the high voltage lead to one of the isolated circuit phase conductors.
• Switch on the HIPOT Tester. Set the meter to 1000 Volts or pre-decide DC Voltage. Push the "Test" button on the meter and after one minute observe the resistance reading. Record the reading for reference.
• At the end of the one-minute test, switch the HIPOT Tester from the high potential test mode to the voltage measuring mode to confirm that the circuit phase conductor and voltage of HIPOT Tester are now reading zero volts.
• Repeat this test procedure for all circuit phase conductors testing each phase to ground and each phase to each phase.
• When testing is completed, disconnect the HIPOT Tester from the circuits under test and confirm that the circuits are clear to be re-connected and re-energized.
• To pass the unit or cable under test must be exposed to a minimum stress of pre-decide voltage for 1 minute without any indication of breakdown. For equipment with a total area less than 0.1 m2, the insulation resistance shall not be less than 400 MΩ. For equipment with a total area larger than 0.1 m2, the measured insulation resistance times the area of the module shall not be less than 40 MΩ⋅m2.