M-G Set Presentation 6104

1

ＮＩＳＨＩＳＨＩＢＡ

Frequency Converter System (MFrequency Converter System (M--G Set)G Set)

NISHISHIBANISHISHIBA ELECTRICELECTRIC CO.,LTD.CO.,LTD.

2

ＮＩＳＨＩＳＨＩＢＡ Target products

SM SG

Powersupply

Load

This is the M-G set.It converts frequency or voltageaccording to its use.

Motor and Generator

MotorGenerator

What is the M-G set?A device that converts electrical energy to rotary energy by using its motorand converts rotary energy to electrical energy by using its generator

Various combinations of motor with generator enable supply of specialpower supply (frequency conversion and voltage conversion) and stablepower supply.

3

ＮＩＳＨＩＳＨＩＢＡ Uses

１ As a 50/60 Hz convertible power supply

２ As a variable frequency power supply

３ As a variable voltage power supply

Uses of the M-G set

When a 60 Hz (50 Hz) power supply is necessary in a50 Hz (60 Hz) region

When you need a power supply that changes frequencyaccording to the use

When you need a power supply that changes voltageaccording to the use

Combining the motor with an inverter enables adjustmentto a wide range of frequencies.

A special design enables adjustment to a wide range ofvoltages.

Factory power supplyIf the commercial power supply isdifferent from the power supplyfrequency of the factory equipmentExample: When 60 Hz (50 Hz)equipment is brought into a 50 Hz (60Hz) region

Test power supplyUsed as a test power supply forinduction motors, fans,transformers, pumps, controllers,home electronics (such as washingmachines and air-conditioners),and other equipmentExample: When frequency or voltageneeds adjustment in a product test

4

ＮＩＳＨＩＳＨＩＢＡ Uses (assumed uses) [Test power supply, part 1]

①As a test power supply for motors and other equipment

M-G set

Commercialpower supply

Example: 60 Hz

Used as a power supply for testingmotors and other equipmenthaving a different frequency

Motor to be tested50Hz

Used as a power supply for testingmotors and other equipmenthaving a different voltage

M-G set


Example: 6600V

Motor to be tested200V

Motor to be tested440V

60 Hzregion

Applied also as a test power supply forcontrollers and other equipment

5


②As a special frequency power supply

Used as a test power supply for transformers


50/60Hz

Example: Tested at aspecial frequency

Factory

M-G set

Test transformer

(Applied as a variable frequency power supply, etc.)

6


Motor to be tested

200V

M-G set

Generator usedas a test power

supply

M-G set used as analternative power

supply

Diesel generator

③Alternative use of a diesel generator


7

ＮＩＳＨＩＳＨＩＢＡ Uses (examples of equipment specification and configuration) (SM-SG), part 1

Reactorpanel

Motorpanel

Generatorpanel

Commercial power supply3φ-3W 6600V 50Hz

M-G set

To load

・Measurement・Protection・Control


APFR

SM SG

Synchronous motor

Synchronous generator

・AVR・Measurement・Protection・Control

AVR

VCB52G

52MVCB

To load3φ3W □V □Hz

Reactorpanel

Motorpanel

Generatorpanel

M-G set

8




APFR

SM SG

Synchronous motor



AVR

VCB52G

52MVCB

To load3φ3W □V □Hz

Uses (examples of equipment specification and configuration) (SM-SG), part 2

Motor panel, reactor panelThey incorporate a starting circuit,protective circuit, and measurement circuitfor motors.They also incorporate an automatic powerfactor regulator (APFR) as well.

M-G set (synchronous motor - synchronousgenerator)The synchronous motor can adjust the fieldcurrent, thereby controlling the operatingpower factor.The M-G set uses a synchronous motor (10-pole) and a synchronous generator (12-pole),so that the output frequency of the generatorcan be kept at 60 Hz unless the frequency ofthe input power supply of the motor changes.

Generator panelThe automatic voltage regulator (AVR) isused to control the output voltage of thegenerator at a constant level.

Reactorpanel

Generatorpanel

M-G set

Motorpanel

9

ＮＩＳＨＩＳＨＩＢＡ Uses (examples of equipment specification and configuration) (IM-SG), part 1



Inverter

IM SG

Induction motor


・AVR

・Measurement

・Protection

・Control

AVR

VCB52G

52MVCB

To load

Inverterpanel

Motorpanel

Generatorpanel

To load

Inverterpanel

Motorpanel

Generatorpanel


M-G set

M-G set

3φ3W □V □Hz

10

ＮＩＳＨＩＳＨＩＢＡ Uses (examples of equipment specification and configuration) (IM-SG), part 2



Inverter

IM SG

Induction motor


・AVR

・Measurement

・Protection

・Control

AVR

VCB52G

52MVCB

To load

Inverterpanel

Motorpanel

Generatorpanel

M-G set

3φ3W □V □Hz

Motor panelIt incorporates a starting circuit, protectivecircuit, and measurement circuit for motors.

M-G set (induction motor - synchronousmotor)It uses an induction motor and a synchronousgenerator.It can convert the frequency of the inputpower supply of the motor by using aninverter, thereby changing the outputfrequency of the generator.

Generator panelIt uses an automatic voltage regulator (AVR)to control the output voltage of the generatorat a constant level at all times.

Inverter panelIt converts the commercial power supplyinput by using an inverter and changes themotor speed.

11

ＮＩＳＨＩＳＨＩＢＡ Product characteristics and selling points, part 1

- The company has numerous good results and high durability andreliability as a manufacturer specializing in rotors.

- The set has a neat waveform, so that it allows precise measurementand produces hardly any noise.

- It has a wide setting range in frequency and voltage and is adaptableto specific specifications.

Characteristics of Nishishiba’s M-G set

M-G set Control panel

12


- Many results as a manufacturer specializing in rotors!Experience of delivering about 20 sets and know-howaccumulated over 40 years

Coping with a wide range of systemsCapacity : up to 10,000 kVAOutput voltage : up to 13,800 VOutput frequency : up to 400 Hz

Product characteristics and selling points, part 2

Characteristics of Nishishiba’s M-G set

13


Voltage waveform of generatorsThe output voltage waveform of the synchronous generator is a neat sine waveand does not include harmonics.

- Properties: Waveform distortion, 5% or less

- Example of measurement of a no-load voltage waveform

Overload resistance and short-circuit current

The generator is of the rotary type, so that it has high overload resistance and cansupply power to loads that need large starting currents such as those from motors.

- Overload resistance : 110% - 60 minutes- Over-current resistance : 150% - 15 seconds

14


Other properties (characteristics)

The output side uses no inverter or other harmonics-generating equipment, so that the load side is completelyprotected from the effects of harmonics.

Harmonics

Even if an instantaneous voltage drop occurs in the commercialpower supply system, the flywheel effect of the rotor keeps theload side unaffected.A flywheel can be added to extend the warranty period ofinstantaneous voltage drops.

Instantaneousvoltage drop

It can be used under general conditions with an ambienttemperature of -5 to 40°C and a humidity of 85% or less.Therefore, although air supply and ventilation equipment inconsideration of temperature rises is necessary, no air-conditioning equipment is necessary.

Installationconditions

Properties and characteristicsItem

15


If there is a great change in the load capacity of the customer, several units can be installedand the number of units used can be switched over to ensure an efficient operation.



APFR

SM1 SG1

Synchronous motor


VCB52G1

52M1VCB



APFR

SM2 SG2

Synchronous motor



AVR

VCB52G2

52M2VCB

M

Rollingequipment

Synchronousequipment

VCB52F1

VCB52F2

To load To load

Example of connecting a single unit when two units are operating in parallel

To run two or more generatorssynchronously, the voltage,frequency, and phase must bematched and the units must beelectrically linked together. Butthe input is a commercial powersupply, so that a device (rollingequipment) must be installed torotate the generator stator inorder to adjust the phasedifference.

Parallel operation of the M-G set


AVR

Product characteristics and selling points, part 5

16


END

Date post:	21-Apr-2015
Category:	Documents
Upload:	rayan-ruff-rydar
View:	42 times
Download:	2 times

M-G Set Presentation 6104

Documents