ON LOAD TAP CHANGERSRSV 5.3

TECHNICAL DATA

Hyundai Heavy IndustriesCo. Bulgaria

2017

EA 782/15 ENG

2

Contents 1. Basic characteristics .......................................................................................................................... 3

1.1. Basic technical data .............................................................................................................. 3 1.2. Rated through current (Iu), rated step voltages (Ui), rated switching capacity (PstN ) ........ 4 1.3. Electrical and mechanical endurance ................................................................................... 5 1.4. Insulation level ..................................................................................................................... 5

2. Review of the different RSV5.3 ...........................................................................................................7

2.1. Main dimensions ................................................................................................................... 7 2.2. Basic connection diagrams .................................................................................................... 8 2.2.1. Designation and range of regulation ...................................................................... 8 2.2.2. Examples of basic connection diagrams .............................................................. 10

3. Appendix ........................................................................................................................................... 12

3.1. Overall dimension drawings of OLTCs ............................................................................. 12 3.2. Additional drawings of OLTCs .......................................................................................... 12 3.3. RSV5.3 – driving shafts arrangement .................................................................................12

Notes:

1) This technical data catalog is intended to be used by transformer designers as well as oth-er 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) TheOLTCismanufacturedaccordingtothespecificdataintheorderspecificationsheetfilledinbytheclient.

4) HHI-Bulgaria is not responsible for the client’s improper selection of an OLTC.

3

1. Basic characteristicsThe OLTCs of Hyundai Heavy Industries Co. Bulgaria (HHIB) meet the requirements of the IEC 60214-1 standard.1.1. Basic technical data

Table 1OLTC type RSV5.3–Δ–1250

Number of phases and application 3 phases, at any point on the winding

Maximum rated through current (A) 1250

Short circuit withstand current (kA)R.m.s. value (3s duration) 16

Peak value 40

Maximum rated step voltage per phase (V) 1000

Rated step capacity (kVA) 1250

Rated frequency (Hz) 50…60

Insulation to earth

Highest voltage for equipment Um (kV, r.m.s.)1) 36

Rated separate source AC withstand voltage, 1 min. duration (kV, r.m.s.) 70

Rated lightning impulse withstand voltage(kV,1,2/50μs) 170

Number of operating positions Without change-over selector – max. of 14With change-over selector – max of 27

Tap selector

Tap selector size (K) is available corresponding to the requirements of the voltage stress across the regulating winding. For the rated withstand test voltages, see Section 1.4.

Oil pressure in the diverter switch oil compartmentOperating oil pressure up to 0,3x105 Pa (testing pressure – 0,6x105 Pa).Vacuum – proof for drying

Siphon for draining the oil from diverter switch oil compartment Basic design – left or right

Drying In vacuum furnace – up to 110°CIn kerosene vapour – up to 125°C

Weight, without oil (kg)Without change-over selector 605 (approx.)

With change-over selector 635 (approx.)

Displacement volume (dm3) 340 (approx.)

OilfillingquantityofthediverterswitchoilcompartmentVs(dm3) 305 (approx.)

Temperature range of the oil surrounding OLTC in accordance to IEC 60214-1

Rated load conditions From -25°C to +105°C

Overload conditions From -25°C to +115°C

1)InaccordancewithIEC60214-1,chapter3.60highesteffectivevalueforphase-to-phasevoltageinathree-phase system for which an on-load tap-changer is designed with respect to its insulation.

Note: Minimum conservator volume due to the temperature expanse of the oil at temperature changes from-30°Cupto+100°Cis:∆V=0,1.Vs+5(dm3).

EA 782/15 ENG

4

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 RSV 5.3

Ium (A) 1250Ui (V) 1000

PstN (kVA) 1250 The rated through current Iu and its corresponding rated step voltage Ui are determined by the curve of the rated step capacity (Fig. 1).

Fig. 1: Step capacity (rated through current Iu [A]; rated step voltage Ui [V])

In the 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.

ThespecificcommutationregimesareclarifiedinthetechnicaldatacatalogforallHHIBOLTCs.

5

1.3. Electrical and mechanical enduranceTable 3 gives the average values for the number of switching operations till inspection of the diverter switch and replacement of the contacts. These values have been obtained as a result of experimenting withrealloadsundermaximumratedthroughcurrentIum(A),ratedstepvoltageUi(V),andcosφ=1.

Table 3: Electrical and mechanical enduranceOLTC RSV 5.3

Number of switching operations till inspection 1) 150 000Number of switching operations till replacement of vacuum interrupters 300 000Mechanical endurance – number of switching operations 500 000

1) or in operation for maximum 3 years

Detailedinformationaboutthenumberofswitchingoperationstillinspectionforthedifferenttapchangersis given in the RSV 5.3 Installation and Operation Manual.

1.4. Insulation levelThe 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.Theinternalinsulationisdimensioneddependingonthevoltagesdefinedbythetransformerwindingtapstothedifferentpartsoftheselector,change-overselectorandthediverterswitch.Fig. 3 shows the main connection diagrams and the typical insulation distances to them. ThewithstandvoltagevaluesfromthedifferentinsulationdistancesaregiveninTable4.ForacorrectOLTC 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 selectedinaccordancewiththespecificrequirements.

EA 782/15 ENG

6

ON LOAD TAP CHANGER RSV 5.3 1250A

Fig. 2: Specificinsulationdistancesofthetransformerwindings

Table 4: Withstand voltages

Insulation distances

Rated withstand voltage (kV)Selector size K

1.2/50 µs

50Hz 1min

a0 40 20b1 200 50b2 170 70c1 240 100c2 250 95d 210 50

WITHOUT CHANGE-OVER SELECTOR

WITH REVERSE CHANGE-OVER SELECTOR

WITH COARSE CHANGE-OVER SELECTOR

7

2. Review of the RSV 5.3 type2.1. Main dimensions 1)

1) For the rest of the dimensions, see appendices.

Fig. 3: Main dimensions of RSV 5.3

WITHOUT CHANGE-OVER SELECTOR

WITH REVERSE CHANGE-OVER SELECTOR

WITH COARSE CHANGE-OVER SELECTOR

EA 782/15 ENG

8

2.2. Basic connection diagrams

Fig. 4 and 4a show the basic connection diagrams where the selector contacts are designated according to the overall dimension drawings.

Fig. 4: Basic connection diagrams

9

Fig. 4a: Basic connection diagrams

EA 782/15 ENG

10

Figures 5, 6, 7 and 8 show the basic connection diagrams; the designation of the operating positions and the respective positions of the selector and change-over selector contacts.

Fig. 5: Basic connection diagram 10.19.1W

Fig. 6: Basic connection diagram 10.19.3W

11

Fig. 7: Basic connection diagram 10.19.1G

Fig. 8: Basic connection diagram 10.19.3G

EA 710.1e/15 ENG

12

3. Appendices

3.1. Overall dimension drawings of OLTCs

RSV5.3–∆–1250A–36kV №1038.1e

OLTCs with pressure relief device and tie-in resistors 1195

3.2. Additional drawings of OLTCs

RSV 5.3 – standard OLTC set №555.1

RS 5/RS 5.3 – 630A & 1250 A, RSV 5.3, RS 6/RS 6.3/RSV 6.3 – arrangement of tap selector terminals

№1160

3.3. OLTCs type RSV 5.3 – driving shafts arrangement

RSV 5.3 – driving shafts arrangement №M6.3.100.002.01e

Please note: The overall dimension drawings and the basic connection diagrams can be changed without prior notice.

ON LOAD TAP CHANGERSTYPE RSV 5.3 – ∆ – 1250 A – 36 kV – 10(12, 14)

№1038.1e

2017

ON LOAD TAP CHANGER RSV 5.3 WITH A PRESSURE RELIEF DEVICE

AND TIE-IN RESISTORS

№1195

2017

ON LOAD TAP CHANGERSTANDART SET

№555.1

2017

OLTCs RS 5/RS 5.3 – 630A & 1250 A, RSV 5.3, RS 6/RS 6.3/RSV 6.3 – ARRANGEMENT OF

TAP SELECTOR TERMINALS

№1160

2017 Sheet 1/2

OLTCs RS 5/RS 5.3 – 630A & 1250 A, RSV 5.3, RS 6/RS 6.3/RSV 6.3 – ARRANGEMENT OF

TAP SELECTOR TERMINALS

№1160

2017 Sheet 2/2

ON LOAD TAP CHANGER RS 5.3/RS 6.3/RSV 5.3/RSV 6.3

DRIVING SHAFTS ARRANGEMENT

№M 6.3.100.002.01e

2017