19501-K Partial Discharge Tester

Features:

• Built-in AC hipot test and partial discharge (PD) detection functions
• Programmable AC hipot voltage output 0.1kVac-10kVac
• Up to 0.01μA-300μA high accuracy and high resolution current meter
• 1pC-2000pC partial discharge detection range
• High voltage contact check (HVCC) function
• Built-in IEC60747-5-5 testing methods
• Separate design for measurement and display unit
• 3 stages of voltage testing function
• PD measured results display (pC)
• PD failure count setting (1-10)
• Multilingual user interface
• USB storage for screen capture
• Graphical editing
• Standard LAN, USB, and RS232 remote control interface

The Chroma 19501-K Partial Discharge Tester is an instrument equipped with AC hipot test and partial discharge detection functions. It's specifically designed for testing high-voltage semiconductor components and high-insulation materials.

Partial Discharge
Partial Discharge is the local dielectric breakdown of a small portion of insulation systems, where the electric field strength exceeds the breakdown point of the insulation material; this does not bridge the space between two conductors.

The partial discharge tester applies voltage to the DUT under a certain condition to measure the apparent partial discharge (PD). Besides verifying its ability to withstand a transient high voltage (hipot test), it also verifies the insulation integrity at rated operating voltage. The partial discharge test can detect whether there are abnormal air gaps on the electrical components by applying a charge slightly above the maximum rated voltage. This also tests its long-term reliability under normal voltage conditions. Although, it is impossible to be 100% free of air gaps inside the insulation material during actual production, the IEC60747-5-5 optocoupler standard still defines that for partial discharge testing, the discharge capacity cannot exceed 5pC (qpd=5pC).

Partial Discharger Calibration
When using a partial discharger to calibrate the partial discharge tester for measuring micro discharge, the signal is very small and fast. Thus, the partial discharge tester has to be accurately calibrated before shipment to ensure the high frequency signal can be measured during discharge. The IEC60270-1 high voltage test standard, which explicitly states the calibration standards and methods for partial discharge, is conformed to developing the Chroma 19501-K partial discharge tester.

High Precision Measurement
The Chroma 19501-K is a high precision partial discharge tester equipped with 200pC and 2000pC two ranges to measure from 1pC to 2000pC, and the best resolution in range 200pC is 0.1pC. Its high accuracy measurement and intuitive display of measured results on the screen facilitate the assessment and analysis of small discharges for highly insulated objects.

Anti-Interference Structure Design
Chroma is aware of the inevitable interference of high-frequency radiation in the environment, so a separate design for the measurement and display unit is applied to the 19501-K Partial Discharge Tester. Its detachable test module can measure the DUT in the closest way to reduce the interference caused by long cables. In the meantime, the measurement circuit uses signal isolation design with an outlet probe of the shortest loop at the test end, and a copper ring to isolate the ambient radiation at the low voltage circuit end to prevent the PD measurement circuit from being interfered with by external noise.