Understanding the Importance of AC hi-pot testing
definition
AC Hipot testing, also known as Dielectric Withstand (DW) testing, is a non-destructive electrical test used to assess the insulation integrity of electrical equipment. It involves applying a high AC voltage to the equipment under test (EUT) to stress its insulation system and identify
any potential weaknesses or defects.
Key Points:
● Purpose: To ensure insulation can withstand operating and transient voltages.
● Process: High AC voltage is applied, and current is monitored.
● Pass/Fail: The test fails if the current exceeds a threshold.
● Applications: Motors, generators, transformers, cables, PCBs, medical devices, automotive components.
There are two test methods used for AC hipot testing commonly
1. Produce the applied power frequency or close to the applied power frequency, which is the conventional AC test transformer method.
2. 0.1hz ultra-low frequency test method
3. Using the variable frequency resonant test system method.
Test transformer+Voltage control unit
They can Be customized for different output voltage and current
There are three types of test transformer: dry-type test transformer, SF6 gas-filled test transformer, oil immersed test transformer.
The capacity can be customized from 3KVA-300KVA
Can be output DC voltage and current combined with high voltage silicon stack
It is the special corollary equipment for test transformer.
There are two types: manual control unit and automatic control unit.
It is made to portable box style if its capacity is below 10KVA.
It is made to console-style above 10KVA
Very low frequency tester
0.1hz ultra-low frequency technology
Low-frequency hi-pot tester is actually an alternative to the power frequency withstand voltage test, it can replace the high-capacity resonance transformer when testing large generators, cables, and other tested equipment as well. The value and weight are greatly reduced than power frequency. Portable and easy to operate. It is especially suitable for withstanding voltage test of electrical equipment with large insulation equivalent capacitance (such as power cables, power capacitors, large and medium-sized generators, and motors.
The test voltage is up to 90KV, test the cables under 35KV.
|
Model |
Rated Voltage |
Load |
Fuse |
Weight |
|
30KV /1.1 |
0.1Hz,≤1.1µF |
8A |
||
|
30kV |
0.05Hz,≤2.2µF |
Controller：6Kg |
||
|
（Peak Value） |
||||
|
0.02Hz,≤5.5µF |
Booster：20Kg |
|||
|
60kV/1.1 |
0.1Hz,≤1.1µF |
10A |
||
|
60kV |
0.05Hz,≤2.2µF |
Controller：6Kg |
||
|
（Peak Value） |
||||
|
0.02Hz,≤5.5µF |
Booster：45Kg |
|||
|
80KV/0.5 |
0.1Hz,≤1.1µF |
20A |
||
|
80kV |
0.05Hz,≤2.2µF |
Controller：6Kg |
||
|
（Peak Value） |
||||
|
0.02Hz,≤5.5µF |
booster：50Kg |
|||
|
90KV/0.5 |
0.1Hz,≤1.1µF |
20A |
||
|
90kV |
0.05Hz,≤2.2µF |
Controller：6Kg |
||
|
（Peak Value） |
||||
|
0.02Hz,≤5.5µF |
booster：55Kg |
variable frequency resonant test system
AC resonant test system theory
A series resonance test system is a highly specialized system used to test the resonant frequency of electrical equipment. This system is widely used in the electrical industry to detect faults in electrical equipment and ensure power systems' safety and reliability.
The system operates on the principle of series resonance, which is achieved when the inductance and capacitance in a circuit are balanced to resonate at a specific frequency. In this state, the impedance of the circuit is at a minimum, and the voltage and current in the circuit are at their maximum values.
The resonance test set is mainly used for AC voltage withstand tests of crosslinked cable, hydraulic generators, main transformers, bus bars, switchgear, GIS, and other projects, with a wide range of applications.
The AC resonant test system components
A high-voltage reactor comprises the heart of the system. The reactor is oil-insulated and consists of two identically wound high-voltage coils mounted on a special core provided with fixed air gaps. The air gaps lie within the coils to reduce flux fringing. The core is mounted permanently to a frame that is mounted in a cylinder. The upper part of the high-voltage reactor includes space for oil expansion with an oil level indicator. The output of the reactor is via a high-voltage electrode.
High Voltage Divider
Excitation Transformer
The exciter section contains a two-winding, single-phase, step-up transformer that supplies the AC voltage required for the resonant circuit. It is mounted in a separate oil-filled steel tank provided with input and output bushings. The output voltage and power of the exciting transformer are normally equal to the rated output data of the test set divided by the Q factor
Advantage Of Resonant test system
the model can be customized based on your test object and test needs, test voltage is up to 1000KV, we can provide best solution for you!
variable inductance resonant test System
Based on the components of serial resonant, there are three parametric variables, inductance L, capacitance C, and frequency f. The capacitance C is the test object. Assume that the inductance is certain, the resonance can be reached by changing the corresponding resonant frequency f based on C. Given that the generator testing frequency is power frequency, as for testing capacitance, we not only regulate the frequency but also reasonably alter the inductance to change the frequency, aiming to meet the requirement of power frequency. In brief, a variable frequency and variable inductance resonant test system is a serial resonant device with variable frequency and inductance. Frequency regulation aims to ensure LC is resonant while the purpose of inductance regulation is to make resonant frequency provide the needed frequency based on the resonance.
Application of Variable Inductance Resonant Test System
When conducting the AC withstand voltage test of the generator, test voltage and time should meet the requirement. In addition, it requires power frequency. Therefore, when using the serial resonant device, it not only requires to use variable frequency power supply which can change output frequency, but also use variable reactor which can change the inductance in order to make the resonant frequency meet the power frequency demand.
The Variable inductance resonant test system components
The variable frequency and variable inductance resonant system is generally composed of the following five parts:
(1) Variable frequency power source characterized by the fact that frequency can be regulated
(2) Exciting step-up transformer;
(3) Fixed reactor + variable reactor;
(4) Capacitive voltage divider;
(5) Protective sphere gap
Onsite test cases
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Wuhan Huayi Electric Power Technology Co.,Ltd
HUAYI is a professional manufacturer in China that researches and manufactures electric testing equipment. Established in 2005, the company is one of the earliest manufacturers of high-voltage testers in China. HUAYI insists on developing and marketing independently and makes efforts to improve the products' quality, reduce cost, and improve efficiency.
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