The Guardian 500VA Plus Hipot Analyzer is designed for hipot tests and analysis. The tests of AC/DC/IR can be programmed in AC 5kV/100mA – DC 6kV/20mA with 500VA output rating which complies with the EN50191 requirements. The 500VA Plus not only includes AC/DC/IR tests but also a new measurement technology – Corona Discharge Detection (CDD). Corona Discharge Detection and Discharge Level Analysis (DLA) are used to specify the:
These functions provide useful data to verify the product’s insulation and increase the reliability of the product during manufacturing.
For Contact Checking during the hipot test, the 500VA Plus is equipped with a High Frequency Contact Check (HFCC) besides the Open Short Check (OSC) function. By conducting the Contact Check during Hipot test, it can increase the test reliability and efficiency significantly.
For convenience, the 500VA Plus has a large LCD screen for operation. In addition, the GFI human protection circuit and Floating safety output prevents electrical hazard to the operator.
Features / Functions
For Transformers: The internal winding of a transformer often endures unstable voltage for long periods when used under normalconditions. Over time, the insulation is affected if the primary side components are in a state of corona discharge. For example, most power transformers reserve an auxiliary coil for other circuits to use in the primary side as the figure shows. When it is used under Vp=750V for a period of time and if the manufacturing process included faulty insulating tape or tubing it would cause a continuous corona discharge. Insulation of primary winding would be compromised and burned out eventually due to the enameled carbonization.
For Motors: As industrial motors or EV motors are used for long hours and under varying environmentalconditions suchas temperature and humidity, features like high durability andreliability are mostcritical.Temperature is also one of the key factors to influence insulation. If corona discharge occurs in turn-to-turn and turn-to-ground, it would cause the insulation to deteriorate due to the increase in heat andmaterial qualitative change. Adding Corona Discharge Detection in hipot testing exceeds the quality requirements for insulation by detecting units with poor insulation early thus reducing the defect rate caused by long-term usage. The image shows Corona Dischard in a motor.
Discharge Level Analysis for high voltage capacitors, safety capacitors, photocouplers and insulation materials:
When gaps or voids in the insulation medium happen in the manufacturing process, different electric fields will be formed and corona discharge will occur when the hipot test is conducted. The medium changes when such usage continue over time and quality issues will appear due to the faulty insulation.
Discharge Level Analysis
The dielectric withstanding voltage of components depends on materials and the manufacturing processes. For improving insulation in components, discharge levels should be defined including Corona discharge, Flashover and Breakdown. The Guardian 500VA Plus is equipped with a Discharge Level Analysis mode (DLA) for defining the programming voltage, time, counts and limits.
It provides discharge analysis of three levels. DLA mode will indicate the withstanding voltage depending on the different level limit beginning with Corona Discharge Start Voltage (CSV), Flashover Start Voltage (FSV), and Breakdown Voltage( BDV). R&D and QC personnel are able to improve insulation by discharge data collection and analysis.
Guardian 500VA Plus:AC/DC/IR/Ground Bond
A190355: 19" Rack Mount Kit