［ Power Source Products for Special Applications ］

Our Trends for Mobile Genset

Keywords

Jun’ichi Takahashi

Dual voltage, Ordinary driverʼs license, Trailer

Abstract

More than 90% of Meidenʼs mobile genset is delivered to power utilities.
Since the Great East Japan Earthquake in 2011, however, these mobile gensets
have been delivered increasingly to government and public ofﬁces and private
enterprises in order to enable them to secure the Business Continuity Plan (BCP).
There are several variants to meet the requirements on end-users. Such various
offering are a marked difference from our identical model for power utilities.
Our unique supply of ﬁrst models includes the trailer type mobile genset,
mobile genset (under 5t vehicle total weight) driven with an ordinary driverʼs
license, and a dual-voltage mobile genset (dual-voltage is a fairly common demand from an endress).

1 Preface
When government and public ofﬁces and private enterprises introduce power generating facilities in order to realize a Business Continuity Plan(BCP), it is common to choose stationary gensets.
In cases when these government and public ofﬁcesand private enterprises have multiple power generating facilities, there are, however, increased casesof choosing mobile gensets since the genset can go
anywhere that is accessible using public roads.
We have manufactured various unique mobilegensets to meet the various end-userʼs requirements. For example, these include a dual-voltage
mobile genset to be commonly used for multiple different facilities, a mobile genset under 5 tons vehicle total weight for use with an ordinary driverʼslicense, end-user such generators that are of thedual-voltage output type that can be used in common at multiple locations, generators with a grossvehicle weight of less than 5 tons that can be operated by any driver with an ordinary driverʼs license,
and a trailer type mobile genset which can be transported to other locations by a truck when such needdictates.
Fig. 1 shows an external appearence of a trailer
type mobile genset. This paper introduces the features of our mobile genset.

Fig. 1Trailer Type Mobile Genset

In 2013, we released a trailer type mobile genset which was ourﬁrst model.

2 Dual-Voltage Genset
The power distribution voltage can be different
in various facilities such as in facilities of sewage
water pumping stations in Japan, for example,
where motor voltages are 400V or 200V. When amobile genset has to be used for both voltages, thevoltage switching generator is applied. For more than
20 years, we have manufactured voltage switching
MEIDEN REVIEW Series No.167 2016 No.2

19

3φ3W 250kVA 420/210V 344A 60Hz (pf 0.8)
DEEX

AG

CP-AC
2P 15A
K90R

CN-AC

CTG1, 2500/5A
15VA

VT1, 2440/110V50VA

CP1VTT-G1

RH

VTT-G2
V1VS1CP-52G1

CTG11, 12500/5A
15VA

52G13P
400AF
400A

CTT-G1M

Overcurrent
sensor
51G13-phase 420V overcurrent

W10-300kW

A1
AS10-500A

CTG21, 22500/5A
15VA

Fig. 20-500A

Excess Specified
voltage voltage
sensor sensor
2784G
59G
V20-300V

52G2
Operatorsource

52G23P
400AF
400A

CTT-G2

Overcurrent
sensor
51G2

A2

W2

3-phase 210V 0-200kW
overcurrent

AS20-500A

CN-U2
CN-V2
CN-W2

CN-U1
CN-V1
CN-W1
Demand load side
3φ3W 420V 60Hz

A
AS

VS2

CP-52G2

F
45-65Hz51G

CP20-600V52G1
OperatorsourceOvercurrent
sensor

Generator
overcurrent

AVRPF

M

CTT-G

Demand load side
3φ3W 210V 60Hz

Single Line Diagram of 420/210V Double Output Type Mobile Genset

Since 420V and 210V outputs are generated at the same time, each output comes with a circuit breaker and a metering circuit.

generators, such as 3300/6600V or 420/210V, etc. For
these generators, connecting bars are rearrangedin the generator terminal box in order to change
connections of generator armature windings fromseries to parallel and vice versa.
For this system, it is necessary to carry out
connection changeovers in the terminal box andalso metering circuit changeovers on the generator
control panel side. In short, operation becomescomplicated. For improvements, we have adopted
another system where all actions for a connectionchangeover can be accomplished on the switchboard side only, with the use of switches. Such an
application is for the ﬁrst time, for medium voltage
facilities.

20

MEIDEN REVIEW Series No.167 2016 No.2

Another example of a dual-voltage application
is when, in order to feed power to a facility having
multiple feeder voltages, a single generator isdevised to feed power at 420V and 210V at thesame time. Generally, a transformer is used to takeout power at different voltages. If such a transformer
is loaded on the vehicle, however, the total weight isinevitably increased. To avoid such difﬁculty, thegenerator itself is designed to generate 420V and210V outputs available at the same time. Fig. 2
shows the single-line diagram of the 420V and 210V
double output type mobile genset.
It is, however, impossible to generate the rated
output at 420V and 210V simultaneously. Fig. 3
shows the output characteristics.

Output at 210V (kVA)140120100806040200Fig. 3050100150200
Output at 420V (kVA)250300

Output Characteristics of 420V/210V Double
Output Type Mobile Genset

At a 210V power supply, even at the maximum, the available
power output is half that of the power output at 420V.

In this connection, we have improved the80/100kVA (50/60Hz) mobile power genset to reduce
one ton from the conventional modelʼs total weightbecause such weight level is most popular amongour customers and this capacity is our high production volume range. We realized a total vehicle weightof less than 5 tons. Key design factors to realize thelightweight design are as follows:( 1) Compact enclosure design was realized.
( 2 ) Large volume of aluminum in the structural elements was used.
( 3 ) Cable drum was removed.

3.1 Speciﬁcations of Major Equipment

Fig. 4

Mobile Genset with Total Vehicle Weight of Less
than 5 tons

This is a mobile genset for Meiden Engineering Corporation inJapan. This model can be driven by anyone with an ordinarydriverʼs license.

Major equipment speciﬁcations are as follows:( 1) Generator( a ) Type: IP20, free-ventilation, rotating-ﬁeld salientpole type( b ) Rated output: 80/100kVA( c ) Rated voltage: 210V( d ) Rated frequency: 50/60Hz( e ) No. of phases: 3( f ) Power factor: 80% (lagging)( g ) Excitation system: Self-excitation brushlesstype( h ) Parallel running: Not permissible( 2 ) Prime mover (Diesel engine)( a ) Type: 4-cycle water-cooled with supercharger( b ) Rated output: 104/120kW( c ) Starter: Electrical( d ) Applicable fuel: Light oil (used in common withvehicle)( e ) Fuel consumption: Approx. 21L/h( f ) Revolving speed: 1500/1800min−1( 3 ) Vehicle( a ) Major dimensions: W4850 × H2550 × D1810mm( b ) Fuel tank: 150L( c ) Noise: 75dB or below (A) 1 meter from machineside (average in 4 positions)

3 Mobile Power Genset with Total
Vehicle Weight of less than 5 tons

4 Trailer Type Mobile Genset

Fig. 4 shows an external appearance of thistype of mobile genset. Formerly here in Japan, adriver with an ordinary driverʼs license could drive acar with a total weight not exceeding 8 tons. The
license system, however, was modiﬁed on 2 June
2007, and the regulatory vehicle weight level waschanged from 8 tons to 5 tons. As such, the demandhas been stronger for mobile genset with total vehicle weight of less than 5 tons.

In 2013, we delivered our ﬁrst model, a trailer
type. The delivered mobile genset is intended foruse only within the premise of the end-user. It has
almost no way of traveling any public roads. Evenon premises, it will rarely travel; therefore, it is not
economical to put the equipment on a truck platform. As such, we selected a platform without atruck. Since a trailer has no prime mover, it is very
easy to carry out maintenance and inspection.
MEIDEN REVIEW Series No.167 2016 No.2

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3φ 625kVA 6600V 50Hz (pf 0.8)
DEAG

EX

EXTF 1kVA
6600/100V
85V
75V

EVT
6600/100/190V
200VA×3 3PF

52G Generator
VCB Circuit
7.2kV breaker
600A
12.5kA

CTG1, 275/5A
40VA

Initial excitation
90R

AVR

27G

CP59G

84GCPVTT-GHCounter type

CP64G

R100Ω

CTT-G

MM1(Multi-meter)

51G

MM1DS-L
Load-side
7.2kV
disconnecting 200Aswitch

MM2MM2(Multi-meter)V ; 0 ～ 9000V
A ; 0 ～ 75A
F ; 45 ～ 55Hz
kW ; 0 ～ 750kW
kWh ; 5 digits of integers × 10 powered
VAR ; －500 ～ 0 ～＋500kvar＊5Electroscope
insulator
Phase rotation
indicator＊5EVT

Load side

Fig. 5EAEB

EDTo the earthing cable

Single Line Diagram of Trailer Mobile Genset

This is a single line diagram of a mobile Genset speciﬁed for a medium voltage application.

When revolution is required, a tractor can be hired.
Due to this arrangement, no driver is needed in daily
operation.
Fig. 5 shows a single-line diagram and Fig. 6shows an exterior view of trailer type mobile genset.

4.1 Speciﬁcations of Major Equipment
The major speciﬁcations for the equipment are
as follows:( 1) Generator( a ) Type: IP20, free-ventilation, rotating-ﬁeld salientpole type( b ) Rated output: 625kVA( c ) Rated voltage: 6600V( d ) Rated frequency: 50Hz
( e ) No. of phases: 3( f ) Power factor: 80% (lagging)

22MEIDEN REVIEW Series No.167 2016 No.2

( g ) Excitation system: Self-excitation brushlesstype( h ) Parallel running: Not permissible( 2 ) Prime mover (Diesel engine)( a ) Type: 4-cycle water-cooled with air-cooled
supercharger( b ) Rated output: 660kW( c ) Starter: Electrical( d ) Applicable fuel: Light oil (used exclusively forthe generator)( e ) Fuel consumption: Approx. 145L/h( f ) Revolving speed: 1500min−1( 3 ) Vehicle( a ) Major dimensions: W10,785 × H3720 × D2490mm( b ) Fuel tank: 500L
( c ) Noise: 85dB or below (A) 1 meter from machine side (average in 6 positions)Unit: mm

10,785 (Total length)
7735

190

Fig. 62490 (Total width)

3720 (Total height)

2900

1340

150

10,1851830

Exterior View of Trailer Type Mobile Genset

An exterior view of the trailer type mobile genset is shown.

5 Postscript

・All product and company names mentioned in this paper are
the trademarks and/or service marks of their respective owners.

This paper introduced some case studies ofour recent unique mobile genset models. Going forward, we will continue to make every effort to provide the models for the best product experience.

MEIDEN REVIEW Series No.167 2016 No.223