HDCG I-1500kV/20mA HVDC Generator

Mode: HDCG I-1500kV/20mA

Applied Standard: 
 IEC 61643-1 2011 Surge Protective Devices Connected to Low-voltage Power Distribution Systems-Part 1: Performance and Testing Methods
 IEC 61083-1 Instruments and Software Used for Measurement in High-voltage Impulse Tests-Part 1: Requirements for Instruments
 IEC 61083-2 Instruments and Software Used for Measurement in High-voltage and High-current Tests-Part 2: Requirements for Software for Tests with Impulse Voltages and Currents
 IEC 62475 High Current Test Techniques-Definitions and Requirements for Test Current and Measuring Systems

Technical Parameters: 
Rated Voltage: 1500kV
Rated Current : 20mA
Ripple Factor: <1.5%(20mA resistive current )
Voltage stability : Test object relative voltage drop <1% under resistive current
4 stages voltage-multiplying drop 22.5kV
Commutation capacitor : 220nF 1set, 110nF 3sets (375kV per set)
Filter capacitor : 110nF 4set (375kV per set) Filter capacitor withstand voltage: 375kV
High-voltage silicon rectifier stack voltage: 500kV
Partial discharge level: 200~500pC when voltage at 1400kV, every minute 10 pulse < 200pC, no pulse requirement.
Working time: one hour on, one hour off, 4 cycle per day.

Main circuit structure, this system is designed as unilateral unsymmetrical single stage voltage-multiplying circuit, besides test transformer, voltage regulator, the filter capacitor, multivoltage capacitor, silicon rectify stack is placed separately on three basement. The resistance voltage divider and earthing switch has the same basement which equip universal wheel and lifting jack. We can customize movable and stable type. Manual change polarity. The top electrode(corona ring) is special designed for DC generator. See outside drawing. There are safety earthing system on the generator, which protects the safety of staff and equipment.

Principle Diagram: