ON LOAD TAP CHANGERS RS 9.3 / RS 9 TECHNICAL DATA

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2 ON LOAD TAP CHANGERS RS 9.3 / RS 9 TECHNICAL DATA Hyundai Heavy Industries Co. Bulgaria

3 EA 675/15 ENG Contents 1. Basic characteristics Basic technical data Rated through current (Iu), rated step voltages (Ui), rated switching capacity (PstN) Electrical and mechanical endurance Insulation level Review of the different RS 9.3 / RS 9 types Main dimensions Number of steps and basic connection diagrams Appendices Overall dimension drawings of OLTCs Additional drawings of OLTCs RS 9.3/RS 9 driving shafts...13 Notes: 1) This technical data catalog is intended to be used by transformer designers as well as other technical personnel responsible for maintenance, diagnostics and operation of OLTCs. 2) HHI-Bulgaria reserves the right to make changes in the overall dimension drawings and connection diagrams without prior notice. Updated drawings are provided as part of the technical documentation received by the customer at the time of the product delivery; updated drawings can be provided also to potential customers on request. 3) The OLTC is manufactured according to the specific data in the order specification sheet filled in by the client. 4) HHI-Bulgaria is not responsible for the client s improper selection of an OLTC. 2

4 1. Basic characteristics The OLTCs of Hyundai Heavy Industries Co. Bulgaria (HHIB) meet the requirements of the IEC standard Basic technical data Table 1 RS 9.3 RS 9.3 RS 9.3 RS 9.3 RS 9.3 RS 9.3 RS 9.3 RS 9.3 RS 9.3 OLTC type ІІІ 200 ІІІ 400 ІІІ 630 І 200 І 400 І 630 І 800 І 1200 І 1600 Number of phases and application 3 in the neutral 1 phase at any point on the winding Maximum rated through current (А) Short circuit R.m.s. value (3 s duration) , , withstand current (ка) Peak value , , Maximum rated step voltage per phase (V) Rated step capacity (kva) Rated frequency (Hz) Highest voltage for equipment Um (kv, r.m.s.) 1) 41,5 72, Rated separate source AC withstand voltage, min duration (kv, r.m.s.) Insulation to earth Rated switching impulse withstand voltage (kv, 250/2500 µs) Rated lighting impulse withstand voltage (kv, 1,2/50 µs) Number of operating positions Without change-over selector max. of 18 With change-over selector max. of 35 Five tap selector sizes (K, L, M, N, Р) are available corresponding to the requirements of the Tap selector voltage stress across the regulating winding. The tap selector insulation level can be chosen independently from the maximum operating voltage to earth. Oil pressure in the diverter switch oil compartment Operating oil pressure up to 0,3x10 5 Pa (testing pressure 0,6x10 5 Pa). Vacuum-proof for drying. Siphon for draining the oil from the diverter switch oil vessel Drying Basic design left or right In vacuum furnace up to 110 C In kerosene vapour up to 125 C OLTC type RS 9.3 ІІІ 200/400/630 RS 9.3 І 200/400/630 RS 9.3 І 800/1200/1600 Tap selector sizes K L M N P K L M N P K L M N Р Weight in kg without chage-over selector (approx.) with chage-over selector Displacement volume in dm 3 (approx.) Oil filling quantity of the diverter switch oil compartment Vs in dm 3 (approx.) 41, ,5 kv kv kv kv kv ,5 kv ,5 kv kv kv kv kv ) In accordance with IEC , chapter 3.60 highest effective value for phase-to-phase voltage in a three-phase system for which an on-load tap-changer is designed with respect to its insulation. Notes: 1. RS 9 OLTCs are with elliptical upper flange. RS 9.3 OLTCs are with round upper flange. All the rest technical data are the same. 2. Minimum conservator volume due to the temperature expanse of the oil at temperature changes from -30ºC up to +100ºC is: ΔV = 0,1Vs + 5 (dm 3 ) 3. RS 9.3 OLTCs can operate with a rated load at oil temperature from -25ºC to +105ºC. 3

5 EA 675/15 ENG 1.2. Rated through current (Iu), rated step voltages (Ui), rated switching capacity (PstN) Table 2 shows the maximum values of Iu, the corresponding step voltage Ui and the rated step capacity PstN. Table 2: Maximum rated through current (Ium), rated step voltages (Ui), rated step capacity (PstN) OLTC RS 9.3 III RS 9.3 I Ium (A) Ui (V) PstN (kva) The rated through current Iu and its corresponding rated step voltage Ui are determined by the curve of the rated step capacity (Fig. 1, 2). Fig. 1: Step capacities (rated through current Iu [A]; rated step voltages Ui [V]) Fig. 2: Step capacities (rated through current Iu [A]; rated step voltages Ui [V]) 4

6 In case of overexcitation of the transformer, the maximum step voltage can be increased with 10% under the condition that the step capacity is limited to its rated value. The specific commutation regimes are clarified in the technical data catalog for all HHIB OLTCs Electrical and mechanical endurance The electrical edurance of the diverter switch arcing contacts depends on many factors, connected with the operating conditions. The number of operations until inspection and contact replacement, obtained experimentally at maximum rated through current, relevant step voltage and cosφ = 1 is given in table 3. OLTC RS 9.3 ІІІ 200 A RS 9.3 ІІІ 400 A Table 3: Electrical and mechanical endurance RS 9.3 ІІІ 630 A RS 9.3 І 800 A RS 9.3 І 1200 A RS 9.3 І 1600 A Number of switching operations till inspection 1) Number of switching operations till replacement of contacts Mechanical endurance number of switching operations 1) or in operation for maximum: 200 A 5 years; 400 A 3 years and for 630, 800, 1200 and 1600 A 2 years. Detailed information about the number of switching operations till inspection for the different tap changers is given in the RS 9.3/RSV 9.3 Installation and Operation Manual Insulation level The insulation level of the OLTC is determined by a number of withstand voltage values. The rated withstand voltage values to earth are given in Table 1. These voltages are determined by national and international standards. The internal insulation is dimensioned depending on the voltages defined by the transformer winding taps to the different parts of the selector, change-over selector and the diverter switch. Fig. 3 shows the main connection diagrams and the typical insulation distances to them. The withstand voltage values from the different insulation distances are given in Table 4. For a correct OLTC selection, these voltage values should correspond to the voltage values that occur during the lightning impulse test, the induced voltage test and the power frequency voltage test of the transformer. The least favorable position of the OLTC should be taken into account. The insulation to earth and the tap selector insulation size are not mutually connected and can be selected in accordance with the specific requirements. 5

7 EA 675/15 ENG RS 9.3 III 200/400/630 OLTCs WITHOUT CHANGE-OVER SELECTOR WITH REVERSE CHANGE-OVER SELECTOR WITH COARSE CHANGE-OVER SELECTOR RS 9.3 I 200/400/630/800/1200/1600 OLTCs WITHOUT CHANGE-OVER SELECTOR WITH REVERSE CHANGE-OVER SELECTOR WITH COARSE CHANGE-OVER SELECTOR Fig. 3: Insulation distances of the transformer windings Insulation distances Rated withstand voltages (kv) Table 4: Rated withstand voltages Tap selector size K Tap selector size L Tap selector size M Tap selector size N Tap selector size P 1,2/50 μs 50 Hz 1 min 1,2/50 μs 50 Hz 1 min 1,2/50 μs 50 Hz 1 min 1,2/50 μs 50 Hz 1 min 1,2/50 μs 50 Hz 1 min a b b c c d

8 2. Review of the RS 9.3 / RS 9 types 2.1. Main dimensions 1) WITHOUT CHANGE-OVER SELECTOR WITH REVERSE CHANGE-OVER SELECTOR WITH COARSE CHANGE-OVER SELECTOR Fig. 4: RS 9.3 ІІІ Table 5: RS 9.3 ІІІ Selector insulation size Um K L M N P h d h d h d h d h d 41,5kV kv kv kv kv Fig. 5: RS 9.3 І Table 6: RS 9.3 І Selector insulation size Um K L M N P h d h d h d h d h d 41,5kV kv kv kv kv Um Fig. 6: RS 9.3 ІI + RS 9.3 I Table 7: RS 9.3 IІ + RS 9.3 I Selector insulation size K L M N P h 1 h 2 d h 1 h 2 d h 1 h 2 d h 1 h 2 d h 1 h 2 d 41,5kV kv kv kv kv ) For the rest of the dimensions see appendices 7

9 EA 675/15 ENG 2.2. Number of steps and basic connection diagrams Fig. 7, 7a and 7b show the basic connection diagrams where the selector contacts are designations according to the overall dimension drawings. Fig. 7: Basic connection diagrams 8

10 Fig. 7a: Basic connection diagrams 9

11 EA 675/15 ENG Fig. 7b: Basic connection diagrams 10

12 Fig. 8: Basic connection diagram W Fig. 9: Basic connection diagram W 11

13 EA 675/15 ENG Fig. 10: Basic connection diagram G Fig. 11: Basic connection diagram G 12

14 3. Appendices 3.1. Overall dimension drawings of OLTCs RS 9 III 200/400/ RS 9 II 200/400/ RS 9 I 200/400/ RS 9.3 III 200/400/ RS 9.3 II 200/400/ RS 9.3 I 200/400/ RS 9.3 I 800/ RS 9.3 I /P 1083 RS 9.3 I RS 9.3 III 200/400/630/P 1085 RS 9.3 II 200/400/630/P 1086 RS 9.3 I 200/400/630/P 1087 OLTSs with pressure relief device and tie-in resistors 310Q OLTCs RS 9.3/RSV 9.3 flange s configuration Additional drawings of OLTCs RS 9.3/RS 9 III 10, 12, 14 arrangement of tap selector terminals 374 RS 9.3/RS 9 III 16, 18 arrangement of tap selector terminals 375 RS 9.3/RS 9 I 10, 12, 14 arrangement of tap selector terminals 376 RS 9.3/RS 9 I 16, 18 arrangement of tap selector terminals OLTCs type RS9 and RS9.3 driving shafts arrangement RS 9 driving shafts arrangement 209 RS 9.3 driving shafts arrangement

15 ON LOAD TAP CHANGERS RS 9 III 200/400/

16 ON LOAD TAP CHANGERS RS 9 II 200/400/

17 ON LOAD TAP CHANGERS RS 9 I 200/400/

18 ON LOAD TAP CHANGERS RS 9.3 III 200/400/

19 ON LOAD TAP CHANGERS RS 9.3 II 200/400/

20 ON LOAD TAP CHANGERS RS 9.3 I 200/400/

21 ON LOAD TAP CHANGERS RS 9.3 I 800/

22 ON LOAD TAP CHANGERS RS 9.3 I 1200 P 1083

23 ON LOAD TAP CHANGERS RS 9.3 I

24 ON LOAD TAP CHANGERS RS 9.3 III 200/400/630 P 1085

25 ON LOAD TAP CHANGERS RS 9.3 II 200/400/630 P 1086

26 ON LOAD TAP CHANGERS RS 9.3 I 200/400/630 P 1087

27 ON LOAD TAP CHANGER RS 9/RS 9.3/RSV 9.3a WITH PRESSURE RELIEF DEVICE AND TIE-IN RESISTORS 310Q

28 ON LOAD TAP CHANGERS RS 9.3/RSV 9.3/RS 7.3/RSV

29 OLTC RS 9.3/RS 9 III 10, 12, 14 ARRANGEMENT OF TAP SELECTOR TERMINALS 374

30 OLTC RS 9.3/RS 9 III 16, 18 ARRANGEMENT OF TAP SELECTOR TERMINALS 375

31 OLTC RS 9.3/RS 9 I 10, 12, 14 ARRANGEMENT OF TAP SELECTOR TERMINALS 376

32 OLTC RS 9.3/RS 9 I 16, 18 ARRANGEMENT OF TAP SELECTOR TERMINALS 377

33 ON LOAD TAP CHANGER RS 9 DRIVING SHAFTS ARRANGEMENT 209 Sheet 1/2

34 ON LOAD TAP CHANGER RS 9 DRIVING SHAFTS ARRANGEMENT 209 Sheet 2/2

35 ON LOAD TAP CHANGER RS 9.3/RSV 9.3 DRIVING SHAFTS ARRANGEMENT Sheet 1/2

36 ON LOAD TAP CHANGER RS 9.3/RSV 9.3 DRIVING SHAFTS ARRANGEMENT Sheet 2/2

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