General NEPTUNE
1General description
 | NEPTUNE family converters are two-quadrants power converters designed to provide up to 24 kA and 110 V in cycling mode to supply septa electromagnets for the LHC and North-Area injections. A NEPTUNE power converter consists of one to four power racks connected in parallel. Each power rack comprises two power bricks connected in parallel, each containing an isolated AC/DC converter. |
| Family | NEPTUNE | |
| Configuration | NEPTUNE 4P | NEPTUNE 16P |
| HCR code | HCRPNEA | HCRPNEC |
| Input Power | 400V/630A/50Hz | 4×400V/630A/50Hz |
| Load impedance | 0-80μH/6-8mΩ | 80-100μH/2-4mΩ |
| Dimensions [m] | W× D× H = 2.5 × 1.5 × 3.5 | W× D× H = 6.4 × 1.5 × 3.5 |
| Weight [kg] | 5t | 13t |
| Application | Injection for North-Area and for the LHC | |
| Control Type | Reg FGC-3 type 10 | |
| Precision class | class 4 (100ppm) | class 3 (50ppm) |
| Voltage ripple [V] | TBD | |
| Operating conditions | Altitude: <2000m above sea | |
| Operating temperature: 0..30° | ||
| Humidity: 30-85% at 30° | ||
| Overvoltage category (primary): III according to IEC-61800-5 | ||
| Overvoltage category (secondary): II according to IEC-61800-5 | ||
| Cooling | 24 L/min | 96 L/min |
Table 1. NEPTUNE converters ratings.
2NEPTUNE team
WP responsible: X. Bonnin
R&D, design: J. Savary
Hardware – Software: S. Reignier, E. Coulot – O. Michels
Production, Operation, Validation – E. Coulot
3Electrical schematics
NEPTUNE 4P is depicted in Figure 2. It consists of:
- One main rack with the control electronics, the water distribution, the output filter, and the DCCTs
- One power rack which includes two power bricks, each of which is made of:
- A power transformer (coupling extended delta-wye 11.5 – Dy11.5)
- A 6-pulse diode rectifier with its DC filter
- Two IGBT switching legs with four HF chokes
NEPTUNE 16P consists in the same CERN control electronics and four power racks instead of one.
