Technical Data On-Load Tap Changer Type H PDF

MASCHINENFABRIK MR REINHAUSEN T D 107/01 e n — 1095/1500...

MASCHINENFABRIK MR REINHAUSEN T D 107/01 e n — 1095/1500 Maschinenfabrik Reinhausen G m b H Printed in Germany Postfach 12 03 60 D-93025 Regensburg 12 Phone: +49-9 41-40 90-0 Fax: +49-9 4 1 - 4 0 9 0 - 1 1 1 Telex: 6 5 8 8 1 TECHNICAL DATA ON-LOAD TAP CHANGER TYPE H Contents Page LI 1-1T T | OP 2 2. Technical Data.....ccccccrverireiierrinreee renee sree 8 3. Special DeSIgNS.....ccoccerrierceirirerrer serene serene e a s e 13 4, Accessorial EQUIPMENT..... c c c c i i i i i i i i i i i i r c rere 14 5. Instructions for construction and installation..............cccccvvineinnnennee 17 [ST oT o = 3 To1) Q O PPT 19 This TECHNICAL DATA BOOK is intended to be used by the designer of power transformers. Dimensions drawings and circuit diagrams are subject to change without notice. Binding drawings will be submitted in tenders and commissions only. The on-load tap changer, i n general, i s manufactured according t o our customer's specification. The customer i s responsible to select the tap changer which meets the requirements.  MASCHINENFABRIK M REINHAUSEN 1. GENERAL 1.1 Summary of technical data Tap changer type H I I 4 0 0 Y | HIN 400 D H 111 400 D 1 2 3 " H Ill 400 D —145" Number of poles 3 3 3 3 Application i n the i n a n y other part of t h e winding?) neutral Max. rated through-current (A) 400 400 Short-circuit withstand (in kA) thermic (three-second value) 5 dynamic (peak value) 12.5 12.5 Rated frequency 50... 60 Hz Operating positions without change-over selector: 17 without change-over selector: max. 14 with change-over selector: 33 with change-over selector: max. 27 Insulation Highest voltage for equipment Up, (in kV) 40 76 123 145 Rated lightning impulse withstand voltage (in kV, 1,250) 200 350 550 650 Rated power-frequency with- stand voltage (kV, 50 Hz, 1 min) 70 140 230 275 Withstand voltage of the internal insulation see section 2.7 10 contacts 2000 Max. rated step voltage (V)? 800 12 contacts 2000 1 4 contacts 1500 1 0 contacts 700 Rated switching capacity (kVA)? 320 12 contacts 700 1 4 contacts 600 Qil compartment pressure-proof up to 0.3 bar in continuous service pressure difference (test pressure 0. 6 bar), vacuum-proof for drying Oil suction pipe standard equipment Tap changer type H I I 400Y | H I I 400 D H 111400 D - 1 2 3 H lll 400 D - 1 4 5 Weight (approx. kg) 190 210 240 265 without change- Qil displacement o v e r selector 230 295 340 375 volume (dm?) ith ch with change- 260 340 415 405 over selector Oil filling Vg | A V | Vg | AV Vg AV Vg AV quantity V g and min. without change- volume : Va over selector 200 | 26 | 260 | 33 290 38 325 42 of the oil con- : servator (dm?) with change- 220 | 26 | 290 | 38 355 46 325 42 Note: 1) obligatory: if the operating voltage between phases of the tap changer exceeds 9 2 k V a stationary oil filter unit with combined filter insert (see section 4.5) m u s t b e u s e d 2) figures depend on number of contacts 3) applies t o oil temperature © = — 3 0 ° C... + 1 0 0 ° C 107/01/95 MR stern 1.2 Survery without with change-over selector with change-over selector Installation length i n m m H Ul 400Y 1 without [| with Un change-over selector 40 kV 1288 1430 h h 768 kV 1288 1430 2564 | — 564 H l 400D 1 1 OLTC H Ill 400 D H lll 400 D-123 Um without | change-over selector 40 kV 1534 176% 76 kV 1654 1881 h h OLYC H Ill 400 D~123 without | with Um change-over selector 123 kV 1873 2288 564 564 H l l l 400 D-145 7 ' u without | with m chan r selector 145 kV 2091 | 2091 h h ?564 KHW 444-2 934 Fig.1 Survey of tap changer models (number of poles, change-over selector, installation length) 13 Design The on-load tap changer type H is designed as selector switch combin- ing the characteristics of diverter switch and tap selector. The load current transfer from one tap of the tap winding to the next which shall be connected to the tap changer terminal is performed first by 2 transition contacts and then by the main contact (fig. 2). The main arcing contact is finally bridged by the main contact. al Fig. 2 Switching sequence of selector switch bi contacts a,b - main arcing contact a b a t , b 1 ~ transition contact A 8 R - transition resistor A,B - main contact 0 10 20 30 40 50ms KHW 192-4 107/01/95  MASCHINENFABRIK MR REINHAUSEN TD 1 0 7 - 4 1.3 Basic connections of the tap winding (fig. 3) Each contact level of the selector switch is provided with 10, 12, 14 or 1 7 " stationary contacts respectively. These contacts are arranged in a circle and can be connected to the tap changer terminal by the movable switching element. For the linear voltage regulation max. 9, 11, 13 or 16" steps respectively (10, © K 12, 14 or 1 7 " operating positions) are available. 9 If necessary, the selector switch may be additionally provided with a change-over selector designed either as reversing switch for buck-and-boost connection of the tap winding or as coarse ! 1 tap selector for connecting the fine tap winding to the beginning or end of the coarse tap winding. In both cases the regulating range can be doubled (+ 9, +11, + 13 or + 1 6 " steps, i. e. 19, 23, a b c 27 or 3 3 " operating positions). KHW 114-4 Note: " Apply to H Ill 400 Y and H 111 400 D, tap changer models with Up, = 40 kV or 76 kV resp. Fig. 3 Basic connections of the tap winding a — without change-over selector b — with reversing switch, ¢ — with coarse tap selector 1.4 Designation of the tap changer model H lI 400 D - 123 - 10191W Every tap changer type is available in different models varying according to the number of poles, max. rated through-current, highest voltage for equipment Up, and basic connection diagram. The designation of a particular tap changer must, therefore, indicate these characteristics (fig. 3). Type The tap changer has thus been marked unmistakeably. Basic connection diagram Number of poles —— Fig. 4 Highest voltage Tap changer designation code Max. rated for equipment through-current U p inkV Example: On-load tap changer type H, three-pole for in amperes neutral end application, for 400 A max. rated through-current, insulation to ground according to Up, = 123 kV, basic connection diagram 10 1 9 1 W Neutral connection Y + Any other connection D 15 Number of steps and basic connection diagram 10 19 1 w The tap selector may be largely adapted to the tap winding with respect to the number of steps required and the connection of the tap winding (see section 1.3). The basic connection diagrams are referenced to the relevant pitch of the contact circle (10, 12, Contact circle pitch Mid-position(s) Change-over 14, 17), the number of operating positions, the number of mid- selector positions and the type of change-over selector. The designation of the basic connection diagram is codified according to fig. 5. 0 A survey of standard connection diagrams with their inherent 1 number of steps is shown in fig. 6. 10 Max. number of 3 G w 12 operating Coarse Reversing 14 positions tap selector switch 17 Fig. 5 Without change- With change- Designation of basic connection diagram over selector over selector Example: Pitch of t a p selector contact circle 10, 10 19 max. 1 9 operating positions, 12 2 | U p = 1 2 3 kV o r 145 k V 1 mid-position, change-over selector 14 27 designed as reversing switch 17 33 U m= 40 kV or 76 kV 107/01/95  MASCHINENFABRIK M REINHAUSEN TD 1 0 7 - 5 10100 12120 14140 17170 steps 11 steps 13 steps 16 steps : | = | 2 =] | 2= 2= 0 § od 2 Swi Ly = A ) a s==1j s 10091W 1) 12111W 1) 14131W + 4 steps +5steps +6steps == rp =e l a a E a E aE: E | H CER 1] + | 10191W 12231W 14271W + 9steps | +11steps 1 + 13 steps 18 | N= Jul. IE pats : Ey Es 10193W 12233W 14273W 17333W +8steps + 10steps + 12steps + 15steps ih 1:. iE Es IB | HE 10191G 12231G 14271G 17331G +9steps + 1 1 steps. J ; 13steps 2 + 168 steps £2 ® g H | 3| iS - - ; 5 ES 25 =i = J u Ble g EB = } « 533. Troe Ee. EE : 10193G 12233G 14273G + 8steps +10steps + 12 steps o 3 | ” g H HI : ; il =a) sf; 5 ® sk FE. Ee B= If H 111400 D — 123, H I 400 D - 145 H Ill 4 0 0 Y/D KHW 439-1 Upp = 40 kV, 76 kV Fig. 6 Survey of basic connection diagrams with standard designation of tap changer terminal which complies with tap changer dimension drawings (see section 6). Note: 1) Similar basic connection diagrams 10 09 1 G... 14 13 1 G (using a coarse tap winding) for + 4... + 6 steps can also be realized. 107/01/95  MASCHINENFABRIK M REINHAUSEN TD 1 0 7 - 6 1.6 Designation of operating positions and tap changer terminals In any case a connection diagram (for examples see fig. 8) for each tap changer is provided, which is binding for the connection of the particular tap changer to the transformer. This diagram contains not only the electrical connections but also a schematic illustration of the physical arrangement of the terminals as seen from above. This diagram determines the designation of tap changer terminals and operating positions of a particular tap changer according t o the customer specification. The tap changer terminal designations used in the tap changer dimension drawings comply with the standard designation (MR-standard). The designation of operating positions of the tap changer is always identical with that of the motor drive unit. Standard designation In the standard designation of the tap changer terminals and operating positions the selector switch terminal 1 is current-carrying in operating position 1. Operating position 1 is at the same time an end position and is reached by running through the regulating range moving the switching elements counter-clockwise. Position 23 22 21 —> 13 12 11 —» 3 2 1 Current-carrying selector switch 11 10 9 —» 1 K 1 — 3 2 1 terminal Change-over a ee | 0) OC) OC) —» 0() 0 ) 0+) —» O(+) O(+) O(+) Operation in »Raise« direction —_— Hand crank rotation | — — — » Clockwise E— Motor drive control | — — p by motor contactor »K2« E— Fig. 7 Correlation of rotation sense of motor drive, hand crank, selector switch and change-over selector moving contacts, designation of operating positions and tap changer terminals (standard designation) KHW 340-2 Example: In tig. 7 the terminal designation of a selector switch is given in the view from above with 1... 11, K (clockwise). The tap changer is just at position 12, the change-over selector connects terminals 0 and (-). Position 1 is reached by operating the switching elements counter-clockwise (view from above), i. e. for manual operation: by turning the hand crank clockwise for electrical operation: by operating motor contactor K2 The rotation sense of the tap changer units is independent of the selected drive shaft arrangement. Special designation If necessary, the following parts of the standard designation may be altered: 1. designation of operating positions, 2. operating direction »Raise« / »Lower« of the motor drive. if necessary, the terminals may be designated according to IEC-Publ. 445 and DIN 42 402. 107/01/95  MASCHINENFABRIK M REINHAUSEN TD 1 0 7 - 7 a 1» 18 17 18 15 4 14 3 13 2 12 1 " 16 0 K 10 |e [] I] 9 9 8 [] 8 8 7 7 7 7 [] 6 3 & 5 5i® 5 5 4 4 4 4 3 3 3 3 2 2 2 2 1 1 1 1 AA ‘STELLUNGDESWENDERS AAA OF POSITION REVERSING BEZEICHNUNG DER LASTWAHLERKONTAKTE BEZEICHNUNGDER LASTWAHLERKONTAKTE SWITCH CONTACTS DESIGNATION OF SELECTOR OF N D E S I G N A T I O SELECTOR SWITCHCONTACTS BEZEICHNUNG DER STELLUNGEN BEZEICHNUNG DER STELLUNGEN OF DESIGNATION POSITIONS OF N D E S I G N A T I OPOSITIONS BETRIEBSSTELLUNGEN BETRIEBSSTELLUNGEN 0 OPERATING POSITIONS Ld OPERATING POSITIONS v VERSCHIEDENE SPANNUNGEN VERSCHIEDENE SPANNUNGEN ™ DIFFERENT VOLTAGES 0 DIFFERENT VOLTAGES JUSTIERSTELLUNG JUSTIERSTELLUNG ° ADJUSTMENT POSITION ®] 5 ADJUSTMENT POSITION bo NANTIGNABAK | STUFENSCHALTER H Ii 400 D-123 H H 4000-12-10 100 MAMCLINENABRIK | STUFENSCHALTER H i l 400 D-123 H Hl 400 B-123-10 19 1 W MRE ON-LOAD TAP CHANGER T MR ON-LOAD TAP CHANGER I [A [] i: [] 8 7 17 [] 18 ] 5 15 Of 4 | 3 13 2 1”? [1 fn 4 K|wnje 9 9 a 3 kd 7 + 8 [} [=] 5 5 4 4 3 3 2 2 1 1 ABLEITUNG STELLUNG DESGROBWAHLERS AAA P O S I T I OF ON COARSE TAP SEI BEZEICHNUNGDER LASTWAHLERKONTAKTE DESIGNATION OF SELECTOR SWITCH CONTACTS BEZEICHNUNG DER STELLUNGEN D E S I G N A OF TIO N POSITIONS o of connection diagrams rExamples. n R—e TIN pr IN: :.. VERSCHIEDENE SPANNUNGEN (single-pole representation) DIFFERENT VOLTAGES » praise [J] 10 a - linear tap winding, 10 operating positions b ~ with reversing switch, 1 9 operating positions MIRRSESETS™ | srurensciaer yp | WWwDwIG c — with coarse tap selector, 1 9 operating positions M005 | comm | ON-LOADTAP CHANGER I 107/01/95  MR RERSE = REINHAUSEN TD 1 0 7 - 8 2. TECHNICHAL DATA 21 Rated through-current ( I ) , rated step voltage (U;) and rated switching capacity (Pgyy) Tap changer H i l 400 Y, H lil 400D H I l 4 0 0 D - 1 2 3 , H I l l 4 0 0 D -145 Number of contacts 17 10 12 14 l y (A) 400 350 400 350 400 400 Ui (V) 800 2000 1750 2000 1750 1500 P s N (kVA) 320 700 700 700 700 600 Table | Rated through-currents (1,,), relevant rated step voltages (U;) and rated switching capacities (PgN) T 2000 2 = 1800 400D - 123, H Ill 400D 1600 y 1400 I 1 H 11 4 0 0 D- 123, H l i l 400D - 145 1200 1000 17 800 rt ——————————————————— 600 HIN 400Y, H I I 400D 400 200 | 0 50 100 150 200 250 300 350 400 KHW 680-4 — ly (A) Fig. 9 Rated switching capacities (I,,, U;) for OLTCs H 111 400 Y / D, H iil 400 D —123 and H [ I l 400 D —-145 107/01/95  MASCHINENFABRIK MR REINHAUSEN TD 1 0 7 - 9 Limitation of the rated step voltage U; of OLTCs H 11 400 D — 123 and H i l 400 D —-145 Basic connection Max. volts per step diagram The permissible step voltage is limited by the dielectric strength of the tap changer, i.e. by limitation of the total operating voltage across the contact circle. The total 10100 2000V voltage must not exceed the limit values of 18,000 V. 10091W 10191 W The max. permissible step voltage of these OLTCs de- 10193W pends on the basic connection diagrams as shown in Table Il. 10191G The indicated voltages, however, apply only, if the step 10193G 2 0 0 0V voltage is constant within the regulating range. 12120 1 6 4 0V 12111 W 2000 V 12231W 1640V 12233W 1 8 0 0V 12231 G 1640 V 12233 G 1 8 0 0V 14140 1 3 8 0V 14131 W 1 5 0 0V 14271 W 1380V 14273 W 1 5 0 0V 14271 G 1 3 8 0V 14273 G 1500V Tablell Max. permissible step voltages for OLTCs H I 400 D— 123 and H Ill 400 D —~145 2.2 Breaking capacity The breaking capacity Pgimaxis the maximum switching capacity under load which can safely be transferred. According to IEC Publication No. 214, section 8.2.2, the breaking capacity has to equal at least twice the rated switching capacity P g ,. 9. twice the maximum rated through-current (I,m) at the relevant step voltage (U;). 23 Contact life The estimated mean contact life of selector switch arcing contacts depending on the relative load (ly / lym) can be seen in fig. 10. As the contact life of a particular selector switch depends on many influencing factors of the prevailing operating conditions only average indications can be given. The inspection instructions must be observed. Fig. 1 0 Estimated mean contact 500 000 life under average load conditions 400 000 3 0 0 000 n ~ number of operations ly — actual through-current lym — max. rated through-current 200 000 100 000 0 0,25 05 075 1,0 KHW 667-4 — ly lym 107/01/95  MASCHINENFABRIK REINHAUSEN 2.4 Temporary overload The tap changer may be installed into transformers which are subject to temporary overload according to the following standards: IEC Publ. 354 »Loading Guide for Oil-lmmersed Transformers«, ANSI C 57.92 »Guide for Loading Oil-lmmersed Distribution and Power Transformers«. A temporary overload of the tap changer does not substantially influence the contact life of the selector switch. 2.5 Short-circuit strength The short-circuit strength of the tap changer is determined by the dynamic" and by the thermic? short-circuit current. For all tap changers type H the short-circuit current strength is in fact higher than required by DIN VDE 0532 Teil 30 Par. 8.3 and IEC Publ. 214 Par. 8.3. The permissible thermic short-circuit current for a test period exceeding 3 seconds may be calculated approximately as follows: s) lth(T) = hth(3) * V3/T (T in second 2.6 Temperature range The OLTC type H is designed to operate in oil under temperatures from - 2 5 °C to +105 °C. If oil temperatures beyond —25 ° C are to b e expected, please indicate this in the order sheet. 27 Insulation The insulation of the tap changer i s determined b y a series of rated withstand voltages. There is a difference between the insulation t o ground {according to the figures in Table lif) and the internal insulation (according to Table IV). The rated withstand voltages of the insulation apply to new well dried-out insulating material immersed in treated transformer oil (temperature at approx. 20°C). U p in kV 40 76 1239) 1459 Rated lightning impulse with- 200 350 550 650 stand voltage in kV, 1,2150 Rated power- frequency with- stand voltage 70 140 230 275 inkV, 50 Hz 1 min. Table lll Rated withstand voltages to ground The insulation t o ground is dimensioned according to rated withstand voltages determined by national and interna-tional standards. These rated withstand voltages correspond t o highest voltage for equipment Up, ( T a b l e Ill). The dielectric s t r e n g t h o f t h e internal t a p changer insulation, however, is determined b y rated withstand voltages (Table IV) which correspond to the necessary grading in practice. The stress on the internal tap changer insulation occurs particularly during lightning impulse test and induced voltage test of the transformer and depends on the operating position of the tap changer. F i g. 1 1 shows t h e specific voltage stress of the transformer winding b y a schematic diagram. Prior t o the final choice of a particular tap changer b e sure that voltage stress of the transformer winding does not exceed the rated withstand voltages in Table IV even in the most unfavourable operating position of the tap changer. Note: 1) Peak value of the highest (first) amplitude of current 2) 3-second r.m.s. value 3) obligatory: if the operating voltage between phases of the tap changer exceeds 92 kV a stationary oil filter unit with combined filter insert (see section 4.5) must b e used 107/01/95  MASCHINENFABRIK M REINHAUSEN H I 400Y -b Ik = -$ 1 ) n | N :| - ® |— f — 0k — oh 4 $b ! I ! I | { IL LU -0 ba IL © | Q Connection: 17170 Connection: 1733 1W,17333W Connection: 173316, 17333G HUI 400D, HIII400D-123, H l i l 400D-145 1 I | ! —— f—{i- 0