Delta PG-45 User Manual download pdf (Page 9)

UCI224D

SPECIFICATIONS & OPTIONS

STANDARDS

Newage Stamford industrial generators meet the

requirements of BS EN 60034 and the relevant section

of other international standards such as BS5000, VDE

0530, NEMA MG1-32, IEC34, CSA C22.2-100, AS1359.

Other standards and certifications can be considered on

request.

VOLTAGE REGULATORS

SX460 AVR - STANDARD

With this self excited control system the main stator

supplies power via the Automatic Voltage Regulator

(AVR) to the exciter stator. The high efficiency

semiconductors of the AVR ensure positive build-up

from initial low levels of residual voltage.

The exciter rotor output is fed to the main rotor through

a three phase full wave bridge rectifier. This rectifier is

protected by a surge suppressor against surges

caused, for example, by short circuit.

SX440 AVR

With this self-excited system the main stator provides

power via the AVR to the exciter stator. The high

efficiency semi-conductors of the AVR ensure positive

build-up from initial low levels of residual voltage.

The exciter rotor output is fed to the main rotor through

a three-phase full-wave bridge rectifier. The rectifier is

protected by a surge suppressor against surges

caused, for example, by short circuit or out-of-phase

paralleling.

The SX440 will support a range of electronic

accessories, including a 'droop' Current Transformer

(CT) to permit parallel operation with other ac

generators.

If 3-phase sensing is required with the self-excited

system, the SX421 AVR must be used.

SX421AVR

This AVR also operates in a self-excited system. It

combines all the features of the SX440 with,

additionally, three-phase rms sensing for improved

regulation and performance. Over voltage protection is

provided via a separate circuit breaker. An engine relief

load acceptance feature is built in as standard.

MX341 AVR

This sophisticated AVR is incorporated into the

Stamford Permanent Magnet Generator (PMG) control

system.

The PMG provides power via the AVR to the main

exciter, giving a source of constant excitation power

independent of generator output. The main exciter

output is then fed to the main rotor, through a full wave

bridge, protected by a surge suppressor. The AVR has

in-built protection against sustained over-excitation,

caused by internal or external faults. This de-excites

the machine after a minimum of 5 seconds.

An engine relief load acceptance feature can enable full

load to be applied to the generator in a single step.

If three-phase sensing is required with the PMG system

the MX321 AVR must be used.

We recommend three-phase sensing for applications

with greatly unbalanced or highly non-linear loads.

MX321 AVR

The most sophisticated of all our AVRs combines all the

features of the MX341 with, additionally, three-phase

rms sensing, for improved regulation and performance.

Over voltage protection is built-in and short circuit

current level adjustments is an optional facility.

WINDINGS & ELECTRICAL PERFORMANCE

All generator stators are wound to 2/3 pitch. This

eliminates triplen (3rd, 9th, 15th …) harmonics on the

voltage waveform and is found to be the optimum

design for trouble-free supply of non-linear loads. The

2/3 pitch design avoids excessive neutral currents

sometimes seen with higher winding pitches, when in

parallel with the mains. A fully connected damper

winding reduces oscillations during paralleling. This

winding, with the 2/3 pitch and carefully selected pole

and tooth designs, ensures very low waveform

distortion.

TERMINALS & TERMINAL BOX

Standard generators are 3-phase reconnectable with 12

ends brought out to the terminals, which are mounted

on a cover at the non-drive end of the generator. A

sheet steel terminal box contains the AVR and provides

ample space for the customers' wiring and gland

arrangements. It has removable panels for easy

access.

SHAFT & KEYS

All generator rotors are dynamically balanced to better

than BS6861:Part 1 Grade 2.5 for minimum vibration in

operation. Two bearing generators are balanced with a

half key.

INSULATION/IMPREGNATION

The insulation system is class 'H'.

All wound components are impregnated with materials

and processes designed specifically to provide the high

build required for static windings and the high

mechanical strength required for rotating components.

QUALITY ASSURANCE

Generators are manufactured using production

procedures having a quality assurance level to BS EN

ISO 9001.

The stated voltage regulation may not be maintained in

the presence of certain radio transmitted signals. Any

change in performance will fall within the limits of

Criteria 'B' of EN 61000-6-2:2001. At no time will the

steady-state voltage regulation exceed 2%.

NB Continuous development of our products entitles us

to change specification details without notice, therefore

they must not be regarded as binding.

Front cover drawing typical of product range.

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Delta PG-45 User Manual Page 9

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