THREE-PHASE TRANSFORMER TPR TYPE
C
D
D
B
A
DIMENSIONI DI INGOMBRO
Dimensions
POTENZA
LUNGHEZZA
PROFONDITA'
ALTEZZA
PESI
INTERASSE RUOTE
Power
Lenght mm
(A)
Deepth mm
(B)
Height mm
(C)
Weights
Totale
Distance between
centers of wheels
(D)
100
1170
580
1360
154
680
520
160
1230
650
1420
210
930
520
250
1310
680
1480
260
1210
520
400
1420
750
1570
330
1620
670
630
1620
880
1770
420
2150
670
1000
1870
1020
1880
560
2900
820
1600
2150
1180
2000
800
4340
820
2000
2250
1500
2150
950
5220
1070
2500
2450
1450
2250
1080
5980
1070
kg
olio
ELETTROTECNICA INDUSTRIALE GRITTI di Gritti L. & C. snc
Sede: Via Torricelli, 18/20 - Molinetto di Mazzano (BS) - Filiale: Via Torricelli, 21/23 - Molinetto di Mazzano (BS)
Tel. 030 26 29 480 / 030 21 20 850 - Fax 030 21 20 536 - E-mail: [email protected]
TRASFORMATORI TRIFASE TIPO TPR
Three Phase Oil Immersed Transformed
POTENZA
NOMINALE
CORRENTE
A VUOTO
TENSIONE
DI C.C.
PERDITE PERDITE
A VUOTO A CARICO
RENDIMENTO
EFFICIENCY AT FULL LOAD
Ated output
KVA
No-load
current
Short circuit
voltage
No-load
losses
Load
losses
TPR
I° %
VCC%
W FE
W CU
4\4
3\4
4\4
3\4
100
1,5
4
250
1400
98,38
98,63
98,20
98,49
48
160
1,3
4
360
1850
98,64
98,89
98,42
98,72
50
250
1,1
4
520
2600
98,77
98,95
98,63
98,84
52
400
0,9
4
740
3650
98,91
99,08
98,80
98,98
54
630
0,8
6
900
5600
98,98
99,15
98,87
99,06
56
1000
0,7
6
1300
9000
98,98
99,16
98,87
99,07
58
1600
0,5
6
2000
13000
99,07
99,23
98,97
99,15
60
2000
0,5
6
2400
16000
99,09
99,25
98,99
99,16
62
2500
0,5
6
2900
21000
99,05
99,22
98,95
99,14
64
COS 1%
COS 0,9%
LIVELLO
DI
SONORITA'
dB(A)
ELETTROTECNICA INDUSTRIALE GRITTI di Gritti L. & C. snc
Sede: Via Torricelli, 18/20 - Molinetto di Mazzano (BS) - Filiale: Via Torricelli, 21/23 - Molinetto di Mazzano (BS)
Tel. 030 26 29 480 / 030 21 20 850 - Fax 030 21 20 536 - E-mail: [email protected]
THREE PHASE OIL TRANSFORMERS
MAGNETIC CORE
The core is constituted of a magnetic cold-roller and grains-oriented sheet, isolated on both sides by a t hin inorganic coating. The
magnetic circuit in formed by three s upporting columns arranged on the same plane and connected by two rectilinear yokes at their
ends.
The interpolated joint type of connection bet ween columns and yokes, cutting at 45° , allows a better utilization of the m agnetic
specification of the sheet, by achieving lower losses and less no load current.
The columns and yokes section is incremented in variable number, according to trans former’s power.
Uniform pressing stiffness and sol idity of the columns is assured by bands made of special insulating materials , while the yokes
pressing is obtained with well-dimensioned structural steel connect ed together by vertical tie-rods that allow a perfect performance of
voltage
An optimised design, whether magnetic or mec hanical, permits reduction of no load loss es
and to obtain a low noise level.
HIGH AND LOW VOLTAGE WINDINGS
The primary and secondary oil transformer windings are norm ally made with electrolytic copper, with insulation of conduct ors in pure
cellulose paper or in double enamel for wires of sm all diameter. These windings are circular sec tion and are a concentric type, coaxial to
the core columns.The low voltage winding is hel ically wound in over lapped alternate strata, norm ally with one or more metal strips in
parallel. The high voltage winding is made with a wire or a metal strip, helically wound with more strata or with continuous disc in
relationship to the working voltage and the transf ormer's power.Every high and low voltage winding element s, assure undeformability in
case of short-circuit.Particular attention i s paid to adjustment engagements, in relationship to the const ructive type and to the use of
voltage winding, in order to avoid strata is i nsulated with pure cellulose paper sized in suc h a way as to bear any mechanical and
electric stress; t he oil's circulation and necessary c ooling are assured by wide channels placed between the windings s trata. Insulation
between high and low voltage and between the latter and the core is m ade with precompressed cardboard cylinders with a thickness,
which conforms, to the respectiv e insulating voltage, and with well-sized oil channels. A specifi c and design consents obtainment of
uniform distribution of i mpulsive type over v oltage and stresses.A perfec t winding locking is assured by use of c ardboard spacers and
evaporated beech that, along with the pressing deformations due electrodynamic s stress.All windings are succ essively dryer in an oven
to definitively remove the remaining moi sture and they are impregnated under vacuum for a perfect tightness to electric stres ses.
TAP CHANGERS FOR ADJUSTEMENT OR VARIAION OF PRIMARY VOLTAG E
The adjustment or variation of primary volt age is done with linear top changers in an oil bath and manoeuvrable with a transformer
disconnected from the network by using k nobs placed on the cover.The tap changers allow fitting the primary winding to the main
voltage's variation to obtain the nominal secondary voltage.The tap changers for the v ariation of primary voltage allows, on the contrary,
obtainment of an immediate commutation when t he transformers are foreseen to act to different work voltage without the problem of
having to raise the core of the transformer c aring out the passage of one tension to another.To avoi d an incorrect positioning of a tap
changers, some holes are foreseen in correspondence wit h each indication notch of the various positions that allow a secure housing of
the knob; in addition, it is possibl e to apply a padlock to avoid accidental or unaut horized manoeuvres.
THE BUSCHING INSULATORS
The high and low bushing insulators are oil-filling type in enamelled brown porcelain, and conform to UNEL standardisation. The
insulators are fixed on the cover with spec ial frames and can be replaced without removing the c ore from the case. The high voltage
bushings are provided with spark grap rods.
THE TANK
For transformer up to the power of 2000 KVA we make type tank which guarantee the absorption an oil expansion and its increase of
volume and doesn't need a spread tank.T ransformers with a higher power have tanks with radiators construct red of cold rolled steel
plate. Radiators are singularly tested before their assembly.T he transformers have a tank, which allows t he spread of hot oil. For
transformers up to 2000 KVA it's poss ible the solution with total filling wi thout conservator.The inside walls of tanks are protected, prior
to sand blasting, with special pants insoluble to hot oil. The outside walls are protected with paints suitable to the s trictest environmental
conditions
INSULATING LIQUID T
he filling of the transformers is obtained with mineral oil, without PBC, dried and degassed, with electrical and chemical specifications,
which conform to the CEI and IEC standards; the fill ing is done under-vacuum for a perfect seal to the impulsive voltages
ELETTROTECNICA INDUSTRIALE GRITTI di Gritti L. & C. snc
Sede: Via Torricelli, 18/20 - Molinetto di Mazzano (BS) - Filiale: Via Torricelli, 21/23 - Molinetto di Mazzano (BS)
Tel. 030 26 29 480 / 030 21 20 850 - Fax 030 21 20 536 - E-mail: [email protected]
STANDARD ACCESSORIESOIL CONSERVATOR
·
OIL FILLING PLUG
·
OIL LEVEL
·
OVERPRESSURE DEVICE
·
CONSERVATOR OIL DRAIN DEVICE
·
DRYER CONNECTION DEVICE
·
AIR DRYER
·
THERMOMETER POCKET
·
TANK OIL DRAIN VALVE
·
GROUNDING TERMINAL
·
LIFTING LUGS
·
TRUCK WITH SLIDING WHEELS
·
RATING PLATE
OPTIONAL (upon request)
·
2 CONTACTS DIAL THERMOMETE R
·
2 CONTACTS GAS RELAYS DGPT2
·
PRESS FILTER CONNECTION DEV ICE
·
OVERPRESSURE FLOW-OFF DEVICE
·
PROTECTION CASE OF LOW AND HING VOLTAGE CASES
·
HING AND LOW VOLTAGE CABLE BOXER
·
HING VOLTAGE DISCONNECTABLE TERMINALS
·
CHECK VALVE TO REMOVE THE COOLING ELEMENTS WITHOUT FREEING OIL
·
COOLING ELEMENTS OIL DRAIN VALVES
·
COOLING ELEMENTS HOISTING EYEBOLTS
·
AUXILIARY CIRCUITS CENTRA LIZED BOX
·
ANTI-CONDENSATE RESISTANCE FOR CENTRALIZED BOX
·
THERMOSTAT FOR ANTI-CONDENSATE RESISTANCE DRIVING
·
AIR PRESSURE SWITCH
RUNNING TEST
All transformers are tested in our test -room according to CEI 14-4 and IEC 76 norms.
The transformers are guarantied 24 mounth
ELETTROTECNICA INDUSTRIALE GRITTI di Gritti L. & C. snc
Sede: Via Torricelli, 18/20 - Molinetto di Mazzano (BS) - Filiale: Via Torricelli, 21/23 - Molinetto di Mazzano (BS)
Tel. 030 26 29 480 / 030 21 20 850 - Fax 030 21 20 536 - E-mail: [email protected]