PRODUCTS TRANSFORMERS ENERGY SAVING TRANSFORMERS (EST) TRANSFORMER RECTIFIER UNITS 3 rd HARMONIC REJECTION TRANSFORMERS (HRT) ULTRA HIGH ISOLATION TRANSFORMERS (TRX) CONSTANT VOLTAGE TRANSFORMERS (CVT/VCT/HST) VARIABLE UNITS

TRANSFORMERS AUTO WOUND NON ISOLATED SUPPLY NORMALLY USED FOR TRANSFORMING VOLTAGES WITHIN A SMALL MARGIN OF THE INCOMING MAINS ie: 100 KVA UNIT, 415 VOLTS TO 380 VOLTS EQUIVALENT FRAME SIZE WOULD BE 8.4KVA

AUTOWOUND

TRANSFORMERS DOUBLE WOUND ISOLATED SUPPLY INPUT AND OUTPUT ELECTRICAL SEPARATE ANY VOLTAGE RANGE

DOUBLE WOUND

VARIATIONS AUTOWOUND (A.W.) OR DOUBLE WOUND (D.W.) INPUT VOLTS AND TAPPINGS FREQUENCY 50Hz OR 60Hz OR BOTH OR OTHER? CURRENT RATING OR KVA OUTPUT VOLTS AND TAPPINGS FREQUENCY 50Hz OR 60Hz OR BOTH OR OTHER? CURRENT RATING OR KVA

VARIATIONS NUMBER OF PHASES SINGLE PHASE (generally Line to Neutral volts) 2 PHASE (Generally the same as single phase except across two lines ie: 415 volts) 3 to 2 PHASE (SCOTT CONNECTED) 3 to 1 PHASE 3 PHASE (Vector group or connection ie: DYn11, DYn1, Dd0 etc this information tell us how to connect the windings and work out the currents in the phase’s

VARIATIONS COOLING MEDIUM NATURALLY AIR COOLED OIL COOLED FORCED AIR COOLED AMBIENT TEMPERATURE ( this will govern the temperature rise in the coil for the Class of insulation) Temperature rise Class ( O, A, E, F, H, C) Insulation Class ( O, A, E, F, H, C)

VARIATIONS OPEN TYPE OR ENCLOSED ENCLOSED TYPE IP PROTECTION RANGE FROM IP22 TO IP54 IP65 NORMALLY QUOTE AS OIL IMMERSED OTHER FURNITURE ie: FUSES, METERS TAP CHANGING SWITCHES, ISOLATOR SWITCHES, CONTACTORS, REGAVOLTS? Etc.

VARIATIONS ALL TRANSFORMERS ARE BUILT TO BS OR IEC SPECIFICATIONS BS 171 POWER TRANSFORMERS BS 3535 ISOLATING TRANSFORMERS BS EN & -2 POWER TRANSFORMERS IEC pt 2.1, 2.4, 2.6 SAFETY OF POWER TRANSFORMERS BS EN / BS5724 MEDICAL ELECTRICAL EQUIPMENT JUST SOME OF THE MANY THAT MAY BE QUOTED

VARIATIONS “CE” BADGING EN61010 (1993) AS PART OF THE “EMC” AND “LVD” DIRECTIVES ALL EQUIPMENT THAT IS HOUSED AND FITTED WITH AUXILLIARY EQUIPMENT IS REQUIRED TO BE “CE” BADGED AND A DECLARATION OF CONFORMITY ISSUED.

ENERGY SAVING PRINCIPAL OBJECT OF THE PRODUCT IS TO REDUCE INPUT VOLTS MOST MODERN EQUIPMENT IS SUITABLE TO WORK FROM 207 / 254Volts THEREFORE THE NEARER TO THE EQUIPMENTS OPTIMUM OPERATING VOLTAGE THE LESS CURRENT IS BEING USED. BENEFITS INCLUDE LESS POWER CONSUMPTION LOWER ELECTRICITY BILLS, LONGER LIFE OF EQUIPMENT

ENERGY SAVING TWO SOLUTIONS TO THE SAME PROBLEM EST = ENERGY SAVING TRANSFORMER LIMITATIONS FIXED TAPPING STEPS UNIT FOLLOWS MAINS FLUCTUATIONS SO IF NORMAL VOLTS FALL THE STEP DOWN VOLTAGE FALLS AS WELL LEADING TO POSSIBLE PROBLEMS THEREFORE MAXIMUM VOLT DROP 8/9% NORMAL VOLT DROPS ARE 3% 5% 7%

ENERGY SAVING ESS = ENERGY SAVING STABILISER CAN STEP VOLTAGE DOWN LOWER THAN (EST) OUTPUT VOLTAGE REMAINS STABLE REGARDLESS OF MAINS FLUCTUATIONS (WITHIN SET PARAMETERS 12.5% approx, THEN IT WILL TRACK MAINS) ADDED BENEFIT OF KEEPING EACH PHASE INDEPENDENTLY CONSTANT, WHICH CAN ADD TO MOTOR LIFE

ENERGY SAVING ENERGY SAVING UNITS WILL NOT WORK ON ALL LOADS? SWITCH MODE POWER SUPPLIES ie ( COMPUTER SUPPLIES) HIGH FREQUENCY BALLAST LIGHTING ?????

HRT 3 RD HARMONIC REJECTION TRANSFORMERS NON LINEAR LOADS GENERATE HARMONICS DESIGNED TO ELIMINATE PRIMARILY MULTIPLES OF THE 3 RD HARMONICS AND SOME OF THE 5 THS

HRT PRODUCT BENEFITS EASE OF INSTALLATION (can be installed without switching off the supply as fitted in parallel) REDUCES HARMONICS REDUCES NEUTRAL CURRENT (high neutral currents can burn out transformers that have not been designed for the purpose, and more consumption of power) REDUCES PHASE CURRENTS REDUCES TRANSFORMER OVERLOADING

TRX ULTRA HIGH ISOLATION TRANSFORMERS DESIGNED TO PROTECT COMPUTERS AND OTHER SENSITIVE EQUIPMENT FROM VOLTAGE TRANSIENTS, SPIKES, NOISE etc.

TRX TYPICAL SPECIFICATION TRANSIENT SUPPRESSION COMMON MODE 88dB TRANSVERSE MODE 65dB NOISE SUPPRESSION COMMON MODE 120dB TRANSVERSE MODE 65dB SINGLE PHASE OR 3 PHASE UNITS AVAILABLE

CONSTANT VOLTGE CVT/VCT/HST WILL SUPPLY A REGULATED OUTPUT VOLTAGE REGARDLESS OF MAINS FLUCTUATIONS SHORT CIRCUIT PROOF ALMOST INDESTRUCTABLE HAS A LIMITED STORAGE CAPACITY FOR A PERIOD OF HALF CYCLE

CONSTANT VOLTAGE CVT/VCT/HST INPUT VOLTAGE TOLERANCE +-15% OUTPUT ACCURACY +-3% WAVEFORM REMAINS SINOSOIDAL WITH LESS THAN 3% HARMONIC DISTORTION EFFICIENCY GREATER THAN 80% FREQUENCY MUST BE 50Hz OR 60Hz AVAILABLE IN VOLTAGES FROM 110 – 440 VOLTS AVAILABLE IN SINGLE PHASE OR 3 PHASE THERE IS A LIMITATION ON SIZE???

TRANSFORMER RECTIFIERS TYPICAL UNITS WILL BE SINGLE PHASE BRIDGE RECTIFIED OR 3 PHASE BRIDGE RECTIFED SINGLE PHASE BRIDGE RECTIFIER TYPICAL RIPPLE CONTENT 48% CAN BE SMOOTHED VIA CHOKE / CAPACITOR CIRCUIT TO APPROX 5-10% MAY INCREASE OFF LOAD VOLTAGES (so information concerning maximum off load volts may be required)

TRANSFORMER RECTIFIERS

3 PHASE BRIDGE RECTIFER TYPICAL RIPPLE CONTENT 5%

TRANSFORMER RECTIFIERS RIPPLE CONTENT CAN BE LOWERED BY SIX PHASE (12 PULSE RECTIFIER UNITS) TYPICAL RIPPLE CONTENT 1%

VARIABLE UNITS A CLAUDE LYONS VARIABLE CAN BE ADDED TO THE MAJORITY OF THE TRANSFORMERS (auto and double wound) DISCUSSED, AND RECTIFIER UNITS. THERE ARE LIMITATIONS THE REGAVOLT IS MANUFACTURED IN STRICT CURRENT CARRYING CAPACITY MODELS, TO INCREASE THIS CAPABILITY MULTIPLE MODELS ARE GANGED TOGETHER SO LIMITATIONS ARE PURELY PHYSICAL.

VARIABLE UNITS TO OVERCOME THIS OTHER ALTERNATIVE’S CAN BE OFFERED A BUCK/BOOST UNIT WHERE THE CUSTOMER ONLY WISHES TO VARY A SMALL AMOUNT AROUND A VOLTAGE A TAPPED BUCK/BOOST UNIT WHERE THE CUSTOMER WISHES ZERO TO (X) VOLTS A FIXED TRANSFORMER IS TAPPED IN EQUAL STEPS SELECTED VIA A SWITCH AND A SMALLER VARIABLE TRANSFORMER IS CONNECTED IN SERIES WITH THE OUTPUT.