AT SERIES OFF CIRCUIT TAP CHANGERS

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1 T SERIES OFF CIRCUIT TP CHNGERS

2 THE CHOICE COE S.P.. PUTS ON THE RKET THE NEW T SERIES OFF CIRCUIT TP CHNGERS. T COE: THE CHOICE Comem S.p.. makes use of four main characteristics in order to be successful on the market as manufacturing leader for off circuit tap changers: Sturdiness: Comem S.p.. uses only first-quality bakelite, usually used even for on load tap changers. We do not use either impregnated transformer boards or plastic materials in the structural components. Designing: Comem S.p.. designs its tap changers with the greatest care paying particular attention to market s needs. The designing makes use of the most up-to-date software to finite elements for the study of electrical fields and mechanical stresses (page ). Reliability: Comem S.p.. makes use of a forty years experience in the manufacturing of accessories and components for transformers. Speed: Comem S.p.. grants the greatest speed in the manufacturing and the delivery of its products even thanks to a warehouse able to supply with extreme dynamism all the necessary parts to manufacture our products.

3 GENERL INDEX 1. General information page 1.1 Presentation page 1. Construction, characteristics and materials page 1. Check and tests page 1. Services page. Simulation at finite elements page.1 Simulation at finite elements of electrical fields page. Simulation at finite elements of mechanical stresses page. Order form page. Off circuit tap changers type TV page.1 TV fixed point off circuit tap changers without shielding rings page. TV bridge off circuit tap changers without shielding rings page 10. TV fixed point off circuit tap changers with shielding rings page TV bridge off circuit tap changers with shielding rings page 1-1. Off circuit tap changers type TC page 1.1 TC fixed point off circuit tap changers without shielding rings page 1. TC bridge off circuit tap changers without shielding rings page 1. TC fixed point off circuit tap changer with shielding rings page 1. TC bridge off circuit tap changers with shielding rings page 1. Detail of pins page 0. ssembling diagrams for TV and TC page 1.1 Scheme 1: handwheel control device (np-0) with direct exit on the cover page 1 Scheme : handwheel control device (np-0) with low side exit and cone clutch page Scheme : handwheel control device with low transmission to men height and cone clutch page Scheme : handwheel control device with transmission to men-height page. one turn = one step driving knob type NP-0 page. one turn = one step horizontal driving knob type NP-1 page. one turn = one step driving knob type NP- page. otorized driving knob type DU-1 NP-1 page. Transmission gearbox 0 with 1:1 ratio type NP-0 page. ngular transmission gearbox 0 with 1:1 ratio type P-1 page 0. rticulated S joint page 1

4 1. GENERL INFORTION 1.1PRESENTTION T series off-circuit tap changers have been manufactured to be used in oil-insulated transformers and they have been designed for maximum compactness. T series off-circuit tap changers have been designed to be used in applications in which a low value of partial discharges is required. T series off-circuit tap changers are single-phase or three-phase. T series off-circuit tap changers are fixed point or bridge type. T series off-circuit tap changers are divided into TV and TC range: TYPE DESCRIPTION RTED CURRENT RTED VOLTGE () (KV) 100 TV Off-circuit tap changers with worm screw TC Off-circuit tap changers with rack On T tap changers with 100kV rated voltage we install the shielding rings only on customer s specific demand. The control devices provided by T series are the following: 1) handwheel control device with direct exit on the cover; ) handwheel control device with low side exit and cone clutch; ) handwheel control device with low transmission to men-height and cone clutch; ) handwheel control device with transmission to men-height.

5 1. GENERL INFORTION 1. CONSTRUCTION CHRCTERISTICS ND TERILS The materials used to manufacture Comem tap changers have been chosen to give the best performance and reliability. The insulating materials belong to class E in accordance with ISO 1, DIN, NF C, Nema LI BS standards. The fixed and mobile contact are made of special brass and copper alloys so as to grant the best thermal, mechanical and wear performance in accordance with IEC 01-1, IEC 01- standards. We took some measures to avoid the pyrolysis of the oil which causes problems on the electrical contacts of off-circuit tap changer. We used steel drive shaft, special gaskets and aluminium parts in order Comem tap changer can be used in tropical environments. 1. CHECK ND TESTS Comem S.p. provided for dimensional and working checks on all the parts and finished tap changers in order to grant the best reliability. ll T series tap changer have been manufactured in accordance with the following standards: IEC 01-1: Tap changers. Part 1: Performance requirements and test methods ; IEC 01-: Tap-changers - Part : pplication guide The following type of tests - available on demand - have been carried out: check of maximum oil overtemperature limits; check of short circuit current strength; check of strength at industrial frequency and impulse;; check of partial discharges. 1. SERVICES Comem S.p.. gives to its clients a complete technical and customer service, with the possibility to design and manufacture off-circuit tap changer on customer s specific demand. Comem S.p.. offers the chance to require the shielding rings for 100kV tap changers and purchase pin wrench DIN 110 (for properly fixing the wires to the diffuser caps) through an enquiry/order sheet (page ). Each tap changer of T series is supplied with a routine test report in accordance with IEC 01-1 standard and with an instruction manual to make a correct installation easier.

elements..1 SIULTION T FINITE ELEENTS OF ELECTRICL FIELDS Electrical field trend created by a 100kV impulse voltage.

6 . SIULTION T FINITE ELEENTS The off-circuit tap changers are subject to electric, thermal and mechanical stresses during their working. For this reason Comem used the highest-quality materials and studied the shapes of T series tap changer through the best software at finite elements..1 SIULTION T FINITE ELEENTS OF ELECTRICL FIELDS Electrical field trend created by a 100kV impulse voltage. SIULTION T FINITE ELEENTS OF ECHNICL STRESSES echanical stresses trend when the maximum couple is applied to the worm screw and the elastic strengths are applied to the electrical contacts.

7 . ORDER FOR Tap changer characteristics Rated voltage Rated current Voltage regulation:, % of rated voltage % of rated current Type of tap changer TV bridge TC bridge TV fixed point TV special TC fixed point TC special special: Electrical wiring Single-phase Three-phase Number of position: Type of control device Diagram 1 page 1 Diagram page 1 Diagram page 0 Diagram page 0 Type of control device Handwheel control NP-0 Horizontal handwheel control NP-1 Revolution control box NP- otor drive NP-1 Lenght of horizontal m Distance among m movement transmission: the stages La*: Lenght of vertical m Distance from the last stage m movement transmission: to the transformer cover Lb*: If motor drive NP-1: Options motor drive: 00 V three-phase 0 Hz V three-phase Hz accessories: 0 V single-phase 0 Hz V single-phase Hz Pin wrench DIN 110 Shielding rings are options only for 100 kv Isolated shafts (Lb and Lc) * La, Lb and Lc : see tap changer drawing provided by us or assembling schemes pages 1-.

8 . OFF-CIRCUIT TP CHNGER TYPE TV Picture 1 Characteristics Current Voltage Shielding rings Wiring diagram Paragraph number kv 1 kv 1 kv 10 kv kv Only on demand Supplied Fixed point.1 Bridge. Fixed point. Bridge.

9 .1 TV FIXED POINT OFF CIRCUIT TP CHNGER WITHOUT SHIELDING RINGS 1 SLIDING CONTCTS 1 = 1 = E C B Current () Voltage (kv) Number of positions B C E Pin Detail Paragraph

10 . TV BRIDGE OFF CIRCUIT TP CHNGER WITHOUT SHIELDING RINGS 1 = 1 = E C B Current () Voltage (kv) Number of positions B C E Pin Detail Paragraph

11 . TV FIXED POINT OFF CIRCUIT TP CHNGER WITH SHIELDING RINGS 1 SLIDING CONTCTS 0 = 1 1 = SHIELDING RINGS 0 E C B Current () Voltage (kv) Number of positions B C E Pin Detail Paragraph

12 . TV FIXED POINT OFF CIRCUIT TP CHNGER WITH SHIELDING RINGS 1 SLIDING CONTCTS 0 = 1 1 = SHIELDING RINGS 0 E C B Current () Voltage (kv) Number of positions B C E Pin Detail Paragraph

13 . TV BRIDGE OFF CIRCUIT TP CHNGER WITH SHIELDING RINGS 1 1 = SHIELDING RINGS = E C B Current () Voltage (kv) Number of positions B C E Pin Detail Paragraph

14 . TV BRIDGE OFF CIRCUIT TP CHNGER WITH SHIELDING RINGS 1 1 = SHIELDING RINGS = E C B Current () Voltage (kv) Number of positions B C E Pin Detail Paragraph

15 . OFF-CIRCUIT TP CHNGER TYPE TC Picture Characteristics Current Voltage Shielding rings Wiring diagram Number of page kv 1 kv 1 kv 10 kv Only on demand Supplied Fixed point.1 Bridge. Fixed point. Bridge. 1

16 .1 TC FIXED POINT TP CHNGERS WITHOUT SHIELDING RINGS = = D E C B Current () Voltage (kv) Number of positions B C D E Pin Detail Paragraph

17 . TC BRIDGE TP CHNGERS WITHOUT SHIELDING RINGS 10 SLIDING CONTCTS 00 1 = = D E C B Current () Voltage (kv) Number of positions B C D E Pin Detail Paragraph

18 1. TC FIXED POINT TP CHNGERS WITH SHIELDING RINGS Voltage (kv) Number of positions B C E D Current () = = SHIELDING RINGS E D C B Pin Detail Paragraph

19 1. TC BRIDGE TP CHNGERS WITH SHIELDING RINGS Voltage (kv) Number of positions B C E D Current () = = SHIELDING RINGS E D B SLIDING CONTCTS C Pin Detail Paragraph

20 . PIN DETIL Ø 0 S H Ø 0 Current () H S max

21 . SSEBLY DIGRS FOR TV ND TC.1 SCHEE 1: HNDWHEEL CONTROL DEVICE NP-0 WITH DIRECT EXIT ON THE COVER NP-0 TRNSFORER TNK La Lb Lc 1kV:IN=1 1kV :IN= 10KV:IN= KV:IN= 1kV:IN=1 1kV :IN= 10KV:IN= KV:IN= * La, Lb and Lc : see tap changer drawing provided by us or assembling and maintenance manual. The connection shafts of the control devices are made in stainless steel, such as the shafts of the tap changers with two or three columns. On demand we can supply insulated shafts for the jointing of the columns. 1

22 . SSEBLY DIGRS FOR TV ND TC. 1 SCHEE : HNDWHEEL CONTROL DEVICE NP-0 WITH LOW SIDE EXIT ND CONE CLUTCH. NP- 1kV:IN=1 1kV :IN= 10KV:IN= KV:IN= 1kV:IN=1 1kV :IN= 10KV:IN= KV:IN= TRNSFORER TNK La Lb Lc * La, Lb and Lc : see tap changer drawing provided by us or assembling and maintenance manual. The connection shafts of the control devices are made in stainless steel, such as the shafts of the tap changers with two or three columns. On demand we can supply insulated shafts for the jointing of the columns.

23 . SSEBLY DIGRS FOR TV ND TC.1 SCHEE : HNDWHEEL CONTROL DEVICE WITH LOW TRNSISSION TO EN HEIGHT ND CONE CLUTCH Lv Lc Lb La * La, Lb, Lc and Lv : see tap changer drawing provided by us or assembling and maintenance manual. The connection shafts of the control devices are made in stainless steel, such as the shafts of the tap changers with two or three columns. On demand we can supply insulated shafts for the jointing of the columns.

24 . SSEBLY DIGRS FOR TV ND TC.1 SCHEE : HNDWHEEL CONTROL DEVICE WITH TRNSISSION TO EN- HEIGHT L0 Lb Lc La:IN=1 TRNSFORER TNK LV 1kV:IN=1 1kV :IN= 10KV:IN= KV:IN= 1kV:IN=1 1kV :IN= 10KV:IN= KV:IN= 1kV:IN=1 1kV :IN= 10KV:IN= KV:IN= NP 1 * La, Lb, Lc, L0 and LV : see tap changer drawing provided by us or assembling and maintenance manual. The connection shafts of the control devices are made in stainless steel, such as the shafts of the tap changers with two or three columns. On demand we can supply insulated shafts for the jointing of the columns.

25 . SSEBLY DIGRS FOR TV ND TC. ONE TURN = ONE STEP OVING DRIVING KNOB TYPE NP-0 HNDWHEEL CONTROL CHRCTERISTICS: Ø 00 Padlocking through,- mm wire. Easiness in manoeuvre and assembling TERILS: 1 ade of aluminium alloy Dynamic seals through VITON gaskets 11 Ø 0 SSEBLY: The control device is supplied already assembled. On demand the control device is supplied with microswitch 10-0 V (N.O.- N.C.) to allow the manoeuvre; the microswitch is activated by the start of the handwheel rotation N Holes Ø

26 . SSEBLY DIGRS FOR TV ND TC. ONE TURN = ONE STEP OVING DRIVING HORIZONTL KNOB TYPE NP-1 CHRCTERISTICS: Padlocking through,- mm wire. Easiness in manoeuvre and assembly Ø HOLE FOR CONTROL BROCHING TERILS: ade of aluminium alloy Dynamic seals through VITON gaskets SSEBLY: 1 The control device is supplied already assembled. 1 PG CBLE-STOP EXIT On demand the control device is supplied with microswitch 10-0 V (N.O.- N.C.) to allow the manoeuvre; the microswitch is activated by the start of the handwheel rotation. 1, = 10 = Ø 00, Ø

27 . SSEBLY DIGRS FOR TV ND TC. ONE TURN = ONE STEP OVING DRIVING KNOB TYPE NP- HOLES FOR SFETY PDLOCK 11 1 SQURE CONNECTION WITH HOLE FOR Ø PIN TO BE DE DURING INSTLLTION, 10, 0 Ø10 0 ECHNICL REVOLUTION LOCK KNOB Ø 0 This control box is used to manually move the tap changer by using a handwheel and to indicate the position it takes (maximum 1 positions). The manoeuvre is very smooth and precise, moreover the mark of the position can be easily seen. The tap changer moves one position for each turn of the handwheel and it has a mechanical stop which locks the control shaft after each complete revolution. Such a mechanical stop can be padlocked. This type of control has several options: transmission of the position to remote site; microswitches allowing HV and LV to close, acting when the tap changers is operated; signal lamp on the front of gearbox to indicate the manoeuvre currently underway and the manoeuvre terminated; start/end manoeuvre microswitches to which connect remote signal lights alarms.

28 . SSEBLY DIGRS FOR TV ND TC. OTORIZED DRIVING KNOB TYPE DU-1 NP Ø1 No. EYEBOLTS STEEL SHFT 0 00 No. FIXED SIDE BRCKETS 0x0x 00 N HOLES Ø1 HNDWHEEL FOR NUL OVEENT The motor drive type DU-1 has been designed for the manoeuvre of off-circuit tap changers. ll the control and manoeuvre gears are housed in a stainless steel case to which the supply, signal, diagnostic and remote control wires are connected. The manoeuvre is made by using the step-by-step principle, which means that is stops after one single impulse. When one of the manoeuvre buttons is pressed only one movement is carried out, hence the button has to be released and pressed again if further movement is necessary. Devices to stop the extreme positions are standard supply. The motor drive is prearranged to be remote controlled. Signals and diagnostic are standard supply. The motor drive can be personalised in accordance with the customer s need and adapted to suit existing systems. TECHNICL DT otor: supply voltage 00 V C three-phase 0 Hz maximum current 1. power 0. kw (0. HP) type poles 10 RP uxiliary circuit voltage 0 V C single-phase 0 Hz aximum voltage applicable at auxiliary contacts and consents 0 V C single-phase 0 Hz aximum voltage applicable at the selector switch for remote signaling of the position 1 V C single-phase 0 Hz Breaking power of the selector switch for remote position signaling 0V Control shaft revolutions for each maneuver 1 Handwheel revolutions for each maneuver 1 Duration of each maneuver approx. seconds aximum number of positions 0 Weight approx. 0 kg. Board degree of protection IP aximum control shaft torque 0 Nm with use of clutch nti-condensation heating element power 0 W ax no. of manoeuvres warranty 0000

29 . SSEBLY DIGRS FOR TV ND TC. TRNSISSION GERBOX 0 WITH 1:1 RTIO NP 0 CHRCTERISTICS: ade of aluminium alloy Stainless steel bolts and nuts Static seals through VITON gaskets TRNSFORER TNK 1 Ø 0 Holes Ø

30 . SSEBLY DIGRS FOR TV ND TC. NGULR TRNSISSION 0 WITH 1:1 RTIO P-1 Ø 100 Ø 0 CHRCTERISTICS: ade of aluminium alloy Stainless steel bolts and nuts Static seals through VITON gaskets Holes Ø, Ø 1 Ø 0 Ø1 Ø 0

31 . SSEBLY DIGRS FOR TV ND TC. RTICULTED S JOINT Ø 1 S 0 X Ø HOLE FOR BROCHING Ø 1 S S X VERTICL NGLE S 0 X X HORIZONTL NGLE When impediments to transmission components are present, it is necessary to use artuculated S joints and related rubber protective covers. 1

32 Due to technical improvement of our products, the information contained in this catalogue may be subjected to change without notice. comem - S.p. Strada Statale 11, Signolo 0 ONTEBELLO VIC.NO (VI) ITLY Tel Fax comem@comem.com Company managed and co-ordinated by BB S.p.. edizione 0/00 -

ABB SpA COMEM Operating Unit Strada Regionale 11, Signolo Montebello Vicentino (VI) - ITALY

ABB SpA COMEM Operating Unit Strada Regionale 11, Signolo 22 36054 Montebello Vicentino (VI) - ITALY www.abb.com/transformercomponents The information contained in this document is for general information