Suzhou Firstall Electrical Machine & Technology Co.,Ltd.

WHAT CAN WE DO FOR YOU

Sizing Your Generator

In selecting an Alternating Current (A.C.) generating set consider the following points:

    1. Total electrical load connected – including any motors i.e. Bore hole pump etc.

    2. Voltage, frequency and phase

    3. Special requirements

    4. Whether automatically started or not

    5. Acceptable sound emissions

CONNECTED LOAD or ASSESSED LOAD

Having assessed the total connected load, consider next the portion of the load that is likely to be switched on at any time. A Generator set with an output a little in excess of the figure should be selected to allow for contingencies. Always allow for future expansion.

VOLTAGE, FREQUENCY AND PHASE

A.C. current is usually supplied by Public Electricity undertakings in sub-Saharan Africa at 230volts and a frequency of 50 cycles (Hertz). The normal supply to the average house is single phase being a two wire systems. The three phase four wire system is usually taken to factories to give higher voltage (The voltage between phases, known as the line voltage has a direct relationship to the phase voltage. 1.73 to 1, i.e. – 230 volt phase voltage, 400 volt line voltage). It is advantageous to use a three – phase supply for electric motor loads both on consideration of price and starting characteristics. Single phase sets with outputs up to 12kW or 15kVA are normally sufficient for domestic installations.

Manual change over:

This is a manual switch normally with a pilot light wired so that when the mains is on the light shows. It would have a Mains/Neutral/Generator switch to ensure that it is either mains on or generator on but never both.

Automatic Standby to Mains:

Sets can normally be supplied which start automatically and take up the load when the mains fail. On restoration of the mains supply the load is automatically transferred to mains and the generator set shuts down. There will always be a delay between mains failure and the generator starting up and supplying full load so if sensitive equipment is being used or computer systems an Uninterrupted Power Supply (UPS) should be installed to ensure no loss of Data. Time delay on switch over can be between 3 seconds and 30 seconds dependant on the generator system installed.

Service Improvement  of our Brushless  ac generators

From now on, all of our brushless  ac alternators will add two connection drawing on the separately unit. (connection drawings）

 Our distributors’ success is our success. We know if we don’t win with distributors, we don’t win at all. We understand that we will do better only if our distributors do better.

Reasons to join the FIRSTALL ALTERNATORS’ distributor network:
1.FIRSTALL ALTERNATORS only market through one independent distributor in one country.

We know, understand, and depend on independent servicing distributors. No direct or indirect sales to other channel from the same territory for same products - everything is sold through our local distributors.
This enables us to deliver personalized service and tailor our approach to local conditions.

2. Profit but trouble free business

If you sell FIRSTALL ALTERNATORS , you will make a large profit! FIRSTALL will provide you best products, promotion program and thoughtful service, which will help you be outstanding and most competitive from the wholesalers for similar products in your country!

3. Complete product line offering

FIRSTALL  is devoting to develop a complete line products on power equipment. You can get all purchase from FIRSTALL, without the trouble to seek for lots of supplier of the alternators from thousands of candidates!

4. Warranty

Firstall has 12 months quality warranty.

5. Firstall as your lifetime partner

We appreciate and value every partner relation. You need, we create. Will be happy to help and support your business activity whenever it is required. Just like you have a office in China!

To join the Firstall alternators’ Distributor Network, contact the us as follows:

stonepower@firstallpower.com    yyy7.7@hotmail.com  

A lot of customers ask us about the alternators 200kw.

As every knows, it has two design for 200kw alternators.  They are different from the frame size:  274K and 4C(314).

So the prices are not the same. Even with a big gap between this two type.

4C-200kw : The core length is 275 . It has 60 slot wire

274k-200kw: The core lenght is 450. It has 48 slot wire.

So the output is not the same.

1. A PMG with its appropriate regulator can enhance a generator’s transient

performance because it will provide a constant AC voltage input to the

automatic voltage regulator  regardless of the generator’s terminal

voltage.

A synchronous generator is taking its input power from the

generator is termed a shunt excited generator. If the generator’s terminal

voltage is reduced as is seen with transient voltage dips upon the application

of significant block loading or motor starting, the input voltage to the  is

reduced by the percentage of transient voltage dip. This reduction in input

voltage to the reduces its ability to force swift recovery of the generator’s

terminal voltage, and may well impact the generator’s ability to start relatively

large motor loads.

2. A PMG with its appropriate regulator can also provide 300% short circuit

support for ten seconds at 60 Hz, without the addition of current boost/series

boost systems.

When a down stream bolted fault is seen at any generator’s terminals, the

generator output voltage will drop to zero. For shunt excited generators, this

will result in zero voltage input to the , and therefore, the generator may

be unable to force current flow long enough for down stream circuit

interrupters to clear the fault, and the entire electrical system will be shut

down. A PMG excitation support system will continue to provide input power

to the , and provide the excitation necessary to clear the fault.

3. When the load on the generator is nonlinear due to thyrister (SCR) power

supplies such as UPS Systems, variable speed drives, etc., the load may

produce notches on the voltage severe enough to cause misfiring of the

power rectifiers in a shunt excited generator’s . When this occurs, the

generator’s terminal voltage will become unstable.

If the generator is fitted with a PMG, the power input to the  is isolated

from these disturbances, and no voltage unstability will occur.

4. A PMG is constructed with a permanent magnet rotor which has a very strong

magnetic field. This eliminates the need for field flashing which is sometimes

necessary with shunt type synchronous generators.

WH series brushless alternators manufactured with alternators’unique design & technology are ranged from 6.5KVA–1250KVA. It can be commonly queipped with engines from all famous brands in the world. Such as  Perkins  Deutz Lister Petter Volovo  Mtu Man John deer  etc.  And of course with Yangdong Weichai Dongfanghong in demestic. They have been successfully applied in the fields of Mine Construction shipping agriculture railway military oil field telecommunications and refrigerated container etc.

Reliable prformance

Reliable preformance is the major advantage of Firstall  WH series alternators and Leroy somer type alternators .  And this reliablity is based on the oustanding design in every aspect and the strict QC system. The materials and components are all from qualified suppliers we selected from those whose quality is the top best in relative lines as our partner. For example to improve reliability of alternators the UL approved varnished wires are selected  to raise the efficiency and reduce the temperature rising, the cold rolled silicon steel with high magenetic flux density is chosen  to extend the rotation hours the world famous bearing are used and the reliable  is adopted to ensure the stability of ouput voltage as well.

Customer first

customer ’s satisfaction is always our action guide and practice. We devote ourselves to develop products to meet customers requirements instead of simply selling our products. Actually, being an exellent alternators manufacturer and supplier , our products are not always invariable , our engineers develop and design new products for customers too, or we alter and improve our standard design to meet customer s requirements.

Technical support and service

As our guarantee to customers technical support and service is a part of our product. Our professional team and in time service network will ensure you to have a proper technical support and service whenever you need.

Firstall’s packing for our alternators

In today’s time and era, packaging not only protects and preserves the product, but also enhances the product imagery, thus creating a niche brand. Be it a business or an industry, be it food, Pharma, engineering, advertising or travel, packaging is practically an indispensable part of the marketing strategy.

Firstall company, is well-versed and equipped with the technology that reflects world-class packaging to meet your requirements. With the plywood case packing, creative cell and the infrastructure enables us to provide you with consistent quality and better designs for our  alternators.