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22-27 October 2018
Mahatma Mandir Conference Centre
Asia/Kolkata timezone

Installation And Initial Run Of 96kV 7.2MW Acceleration Grid Power Supplies

23 Oct 2018, 08:30
Mahatma Mandir Conference Centre

Mahatma Mandir Conference Centre

Gandhinagar (nearest Airport: Ahmedabad), India
Poster FIP - Fusion Engineering, Integration and Power Plant Design P1 Posters


Mr Narinder Pal Singh (Institute for Plasma Research)


Acceleration Grid Power Supplies (AGPS) provides 8MW power at (-) 96kV to the beam source of DNB (Diagnostic Neutral Beam) and SPIDER (Source for Production of Ion of Deuterium Extracted from Rf plasma) for acceleration of negative ions with specific modulation. High Voltage Power supplies (HVPS) based on PSM (Pulse Step Modulation) topology has already demonstrated its ability for broadcast transmitters, accelerators of RF source, neutral beam injectors. PSM based 96kV/75A AGPSs have been developed to feed the Acceleration Grid of Beam sources. Design redundancy ~15% allows for tolerating SPS modules failure without leaving the ongoing campaign. The AGPS is designed to turn off in a time much lower than 100 µs to minimize the energy (20 J) delivered to the arc in case of short circuit or breakdown. AGPS mainly composed of Multi-Secondary Transformers (3nos. 2.8MVA each), Switched Power Supply (SPS) Modules (150nos., 60kW each), FPGA/Real Time based controller and other auxiliaries including passive protection devices; factory tested in witness of IO. Novel, state of the art technologies for HV insulation such us multiple bushings integrated on large resin insulators and building feedthroughs have been developed. To ensure described functionalities a single AGPS is controlled by 9 powerful synchronous FPGAs managed by real time controller which support high performance requirement of PSM based HVPS like low ripple, high resolution, programmable rise time, fast dynamics, full depth modulation, fast switching off and fast (~few milliseconds) re-application in case of breakdowns. Deliveries of AGPSs are sequenced to allow early operational drills at ITER-India lab while other unit is being installed at NBTF site. Present article describes operational drills including protection functions, insulation test and specified behaviour of AGPS on dummy load at ITER-India lab. This allows for offering DNB-AGPS for extended Factory acceptance testing.
Paper Number FIP/P1-39
Country or International Organization India

Primary author

Mr Narinder Pal Singh (Institute for Plasma Research)


Mr AMITKUMAR PATEL (INSTITUTE FOR PLASMA RESEARCH) Mrs Aruna Thakar (Scientific Officer) Mr Bhavin Raval (Engineer SD) Mr Dishang Upadhyay (Engineer SC) Mr Hitesh Dhola (ITER-India, IPR) Mr Kush Mehta (Technical Assistant) Mr Niranjanpuri Goswami (Techincal Assistant) Mr Rasesh Dave (Engineer SD) Mr Sandip Gajjar (iter-india) Mr Ujjwal Baruah (Scientific officer H) Mr Vikrant Gupta (Engineer SE)

Presentation Materials