Rectifier NPP
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Rectifiers For Stationary Battery Systems in Nuclear Power Plants

1.1 Application Electronically controlled rectifier assemblies are used in conjunction with suitable lead-acid or nickel-cadmium batteries, to provide a protected DC power supply system. These systems are then used to supply power to critical loads in nuclear power plants, both when the mains supply is present, and during power failures. Typical loads are: • Power station equipment • Signalling, control and protective electronics • Telemetering and telecontrol engineering • Telecommunications equipment • Static inverters • AC and DC motors • Solenoid valves The rectifier assemblies used...

2. Signalling and Monitoring Devices The power supply units are fitted as standard with electronic monitoring modules. These are integrated into a subrack (Fig.3). If the voltage falls below 1.6 V per cell and the current is 100% of the nominal current, a fault signal is given. The signal is processed on the SME I and in the unit as described in 2.1. However the unit only switches itself back on once acknowledgement has been given on the SME I. 2.1 DÜW III Three-Phase Current Monitoring The DÜW III three-phase current monitoring device has three monitoring functions: • Mains undervoltage...

ling gnal d Si an ing nitor s Mo ice Dev 2.4 GUG III Ripple Monitor The GUG III ripple monitor measures the alternating component of the rectifier units superimposed on the DC voltage. If the residual ripple content exceeds a set value, a signal is given via a yellow LED. The signal is processed by the SME I as already described in 2.2. In rectifier units without reinforcing smoothing, the GUG III can also be used as a battery circuit monitor. In this case the unit tripping and locking function does not apply. 2.5 Fuse Monitoring The fuses connected ahead of the power semiconductors and the...

Cons truct ion of Rect ifier s 3.1 External Construction The units are built into a welded steel section framed housing to IP 20 protection standards and are designed with vents at the joints. The side and rear panels can be prepared. For transportation (loading and unloading) the housing is fitted with crane lifting eyes. If desired, casement-type or espagnolette fasteners can be used. At seismic requirements, additional mechanical reinforcements are implemented (see figure 6). The following display and control elements are positioned on the front door of the housing (see Fig. 5). • Unit...

Charging characteristic: IU to DIN 41 773, can be switched to manually controlled W characteristic Operating modes: The mode required can be selected with a selector switch. Float charging: Parallel standby operation with IU characteristic, 2.23 V per cell Boost charging: Parallel standby operation with IU characteristic, 2.4 V per cell Commissioning charging: W characteristic at up to 2.7 V per cell. The charging current is smoothly adjustable. Stability of output values: Permitted variations under DIN 41 773: Mains voltage ± 10 % at 2.4 V/Z, + 10 - 15 % at 2.23 V/c Mains frequency...

Power factor at 29 V and rated current Efficiency at 29 V and rated current Power factor at 121 V and rated current Efficiency at 121 V and rated current D 400 G 108/ 200 BWLrug-Dt D 400 G 108/ 300 BWLrug-Dt D 400 G 108/ 400 BWLrug-Dt D 400 G 108/ 600 BWLrug-Dt D 400 G 108/ 800 BWLrug-Dt D 400 G 108/1000 BWLrug-Dt D 400 G 108/1200 BWLrug-Dt D 400 G 108/1600 BWLrug-Dt Power factor at 245 V and rated current Efficiency at 245 V and rated current D 400 G 212/ 100 BWLrug-Dt D 400 G 212/ 200 BWLrug-Dt D 400 G 212/ 300 BWLrug-Dt D 400 G 212/ 400 BWLrug-Dt D 400 G 212/ 600 BWLrug-Dt D 400 G 212/...

ery Batt ly Supp s Unit General The battery supply unit connects the power supply to the battery, and is designed as a floor standing sheet steel cabinet, with hinged front door and corresponding KKS marking. The unit should stand adjacent to the power supply, and is connected via copper bus bar. The requirements of the UVV BGV A2 are met, especially with regard to protection against accidental contact. Equipment The standard battery supply units are equipped as follows: • NH-fused load disconnection switch equipped with the corresponding battery fuses with fuse monitoring. • battery...