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close this book Governor Product Information
close this folder Chapter 6: Governor suppliers
View the document 6.1 General remarks
View the document 6.2 A few recommendations when dealing with governor suppliers
View the document 6.3 Suppliers of electronic load controllers
View the document 6.4. Suppliers of mechanical speed control governors

6.3 Suppliers of electronic load controllers

6.3.1 G.P. Electronics

6.3.2 THES Small Hydro Controls

6.3.3 IREM

6.3.4 List of further suppliers

6.3.1 G.P. Electronics

G.P. Electronics was founded 25 years ago. Developing ELC's was started in 1973 and many units are continuously running in 35 countries. In case of inquiries the person to be contacted is:

Mr. Gerry Pope

G.P. Electronics

Bovey Tracey

Devon TQ13 9DS, U.K.

Phone No.: U.K. 0626 83 26 70

G.P. Electronics have a rich experience and will certainly advise you on how to choose the appropriate alternator size, whether you shall choose a single or three phase system, on how to select a suitable ballast load, etc.

To give you an impression of the kind of hints you can expect from them see their notes on hydro systems using G.P. Electronic Load Controllers concerning the voltage regulator below:

Quote: "Voltage regulators:

The frequency of the hydro plant is controlled by the Load Controller and the voltage is controlled by the alternator's own voltage regulator. Nearly all of the problems associated with hydro electric plants are due to voltage regulators. There are many designs and variations but they can be split into two basic types, the STATIC type consisting of current transformers, chokes, diodes and resistors and the ELECTRONIC type. The static type is the most reliable and stable, the diodes being the only parts which usually ever break down. The voltage regulation is quite adequate for use with a Load Controller because there is always a constant load.

The ELECTRONIC type offers very good regulation but is less reliable. This type is nearly always fitted to brushless machines, they are usually designed to work with engine driven alternators where the load is subject to large changes and where good regulation is required. Consequently they need to be very sensitive. This high sensitivity can sometimes cause hunting in a load controlled hydro system. If hunting occurs look to see if the voltage is changing with the hunt, if the voltage is changing then it shows that the voltage regulator is not doing its job properly. If this is the case, try fuming the "stability control" of the voltage regulator, this may stop the hunting, if not then the regulator is too sensitive. The sensitivity may be reduced by adding resistance in series with the output leads of the regulator where they enter the alternator - usually marked "X" and " XX". Connect a resistor of about 30 ohms 20 W or preferably a variable one (rheostat 0-100 ohms) in one of these leads and increase the resistance until the system is stable and the voltage is still correct at full load. Voltage regulators which are mounted inside the alternator should be removed and mounted in a separate box away from heat and vibration." (end of quote)

The G.P. Electronics ELCs are available in standard sizes, the units use phase controlled thyristors and are designed to run continuously under tropical and high altitude conditions.

As a sample, the data sheet and indicative prices are given for STAR Connected 380/415 V 3 Phase Electronic Load Controllers below:

CONTROLLED VARIABLE

Frequency (50 Hz or 60 Hz). With automatic phase balance.

CONTROL METHOD

Integral or proportional, using phase controlled thyristors.

CHARACTERISTICS

On sudden application or removal of full load (integral control).

Transient frequency deviation, better than 0.2 Hz. Recovery time, better than 0,5 sec.

Constant frequency maintained for all input powers up to maximum.

METERING

One line voltmeter, one frequency meter, three alternator ammeters and three ballast voltmeters (analogue type).

TERMINATIONS

Alternator Input (4 wire), Main Load Out (4 wire), Ballast Load Out (4 wire). Bottom cable entry via gland plate.

MAX. AMBIENT TEMPERATURE

55 degrees centigrade, no altitude restriction.

DIMENSIONS (approx) all powers

800 mm high, 600 mm wide, 300 mm deep (steel enclosure).

TRIPS & CONTACTOR (optional)

Frequency trip, adjustable from 0 up to + or - 3Hz from set frequency. Contactor disconnects the main load only (not Ballast) when frequency goes outside set limits. Contactor must then be manually reset by push button on front panel. Stop push button on front panel opens contactor and disconnects main load. Two front panel lamps indicate status of frequency trip and contactor.

POWER HANDLING

Main Load: 4 wire, 220/240V line-neutral delta with PF better than 0.8.

Ballast load: 4 wire resistive.

ELC

Main Load

Ballast Load

Weight

Terminals

Current

Power

upt to (max.)

upt to (max.)

approx.

size

PF=0.8

21 kW

21 kW

24 kW

45 kg

M6 studs

38 Apms

30 kW

30 kW

35 kW

55 kg

M6 studs

57 Amps

60 kW F

60 kW

70 kW

65 kg

M6 studs

114 Amps

90 kW F

90 kW

105 kW

70 kg

M8 studs

171 Amps

150 kWF

150 kW

172 kW

90 kg

M10 studs

284 Amps

Units marked with F use fan cooled heat sinks

THREE PHASE STAR 3891414 VOLT 50 OR 60 HZ

DESCRIPTION

 

PRICES

       

ELC POWER RATING

APPROX. WEIGHT(STAND.)

STEEL ENCLOSURE SIZE mm

COMPLETE STANDARD UNIT

LESS TRIP & CONTACT.

LESS TRIP CONTACT.

METERS 8

21 kW

45 kg

300x800x600

£1270

£1030

£ 850

 

30 kW

55 kg

300x800x600

£ 1533

£ 1263

£ 1063

 

60 kW

65 kg

300x800x600

£ 2294

£1974

£1775

 

90 kW

70 kg

300x800x600

£ 2877

£ 2537

£ 2337

 

150 kW

90 kg

300x800x600

£3390

£2950

£2750

 

225 kW and above

 

Details on application

       

 

6.3.2 THES Small Hydro Controls

THOMSON AND HOWE ENERGY SYSTEMS INC. is a small company located in Kimberley B.C. Canada. T.H.E.S. has been dedicated to providing small hydro electronic control equipment for eleven years now. They concentrate on plants of capacity from I kW to 5000 kW, with an average size of about 70 kW. Their equipment is used on more than 350 hydro sites at the current time, and this number is currently increasing et the rate of almost 2 per week. About 30 % of their manufacturing output is now destined for 50 HZ applications, the rest for use at 60 Hz.

With some minor exceptions, all their equipment is based on micro-processor technology, but integrated into the equipment such that the equipment remains simple to understand, troubleshoot, or repair. For instance, most of their digital governors have all the logic built into one easily replaced plug-in module. T.H.E.S. designs and manufactures its own circuit boards to maintain highest reliability and ruggedness.

Their major product area currently is for hydro governors incorporating load control, where they have eight different product lines for use on systems as small as 12 kW, or as large as 5000 kW, with or without load management capability, with or without water management capability. List prices start at about $ 500.00 U.S. They are currently dominating the governor market in North America for hydro plant governors under about 300 kW.

Complimentary to their governing equipment, they also offer a complete line of custom built switchgear, heater tanks, and also load management equipment for small hydro systems. Load management equipment is often essential to prevent plant overloading, or to obtain maximum plant factor in order to improve return on investment.

They also have application specific control packages for synchronous and induction plants to be interconnected with utilities for co-generation purposes.

Their shipments during 1989 have included the following sites:

Sweden

70 kW

Vermont

10 kW

Wyoming

10 kW

Montana

10 kW

Hawaii

20 kW

California

20 kW

Ohio

5 kW

Sweden

25 kW

Zaire

15 kW

California

10 kW

Marocco

100 kW

Bolivia

150 kW

Korea (2 x)

500 kW

Canada

25 kW

Mass.

100 kW

Canada

5 kW

Alaska (2 x)

500 kW

Chili (2x)

5 kW

California

12 kW

Canada

300 kW

California

12 kW

Canada

12 kW

Ohio(2 x)

5 kW

Canada(4x)

2 kW

Sweden

5 kW

Canada(2 x)

250 kW

Canada

15 kW

   

 

Person to be contacted:

B. Thomson, F. Howe

THOMSON AND HOWE ENERGY SYSTEMS INC.

Site 17, Box 2, S.S. 1

Kimberley, British Columbia / CANADA

Phone: (604) 427-4326

Fax: (604) 427-7723 or (604) 427-4326

 

6.3.3 IREM

IREM is an industry which has been active in the electromechanical and electronic sector for 40 years.

Their ECOWATT Electronic Regulators are of modular construction and at present the maximum adjustable power of any element is equal to 2 or 10 kW. Hence, the number of necessary regulators depends on the plant capacity and the kind of electricity distribution (single/three phase 220 V or three phase 380 V).

Each electronic regulator has 15 regulation steps of 133 W or 666 W respectively. Therefore the regulation curve is a "broken" one (refer to figure 59 below) but can of course be approximated by a straight line. In case of a higher number of regulation steps this approximation becomes even more accurate.

As the reaction time is very short - the regulator goes from 0 to 100 % of the regulated power in about 150 milliseconds - the incorporation of a flywheel on the turbine/generator side is unnecessary, furthermore the recovery time is independent from the number of regulators installed.

Each electronic regulator is set, during tests, at a normal operation threshold of +/- 5 % of the nominal voltage and frequency (which corresponds to +/ - 11 V and +/- 2,5 Hz). In case of specific requirements this threshold can be increased or decreased. The regulators are protected against overvoltage and radio frequency interference, they must be grounded.

The person to be contacted in case of enquiries:

Mr. Alberto Bonini

IREM SPA - SEDE / Head Quarters

Via Vaie 42

I- 10050 S. Antonino / ITALY

Phone: (011) 96 49 133

Telex: 212134

Fax: (011) 96 49 933


Figure 59: Characteristic curve of ECOWATT electronic regulators.

 

6.3.4 List of further suppliers of load controller

Mr. N. Smith

Dept. of Electrical Engineering

Trent Polytechnic

NOTHINGHAM U.K.

Hydro Power, V. Schnitzer

Industriestrasse 68

D - 6901 BAMMENTAL

Germany

GUGLER Gesellschaft m.b.H. & CO KG

A - 4085 NIEDERRANNA 41, Austria

Phone: (07285) 514 536

Fax: (07285) 62 42

Telex: 116 540

H. Kobel

Elektro-Apparatebau

CH-3416 AFFOLTERN i.E.

Switzerland

Phone: (034) 75 14 13

Contact adress international:

J.M. Chapallaz

Microhydro Engineering

Dryade 2

CH-1450 STE.CROIX, Switzerland

Phone: 0(24) 61 10 42

Wurtenberger & Haas

H.P. Roth

Bannwaldallee 44-46

D-7500 KARLSRUHE / Germany

Phone: (0721) 55 10 22 or 55 10 23

telex: 7826 823

fax: (0721) 55 71 54

ITDG

Myson House

Railway Terrace

RUGBY CV 213HT, United Kingdom

Phone: (0788) 60631

Fax: (0788) 540 270