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TABLE OF CONTENTS
1.Foreword
.............................................................................................................................................4
2. General ............................................................................................................................... 8
3. Technical data ................................................................................................................... 11
3.1 Type SHZV On-Load Tap Changer Technical Data ....................................................... 11
3.2 Operation conditions ....................................................................................................... 12
4. Type designation ............................................................................................................... 12
4.1 Type designation ............................................................................................................. 12
4.2 Insulation level of tap selector ........................................................................................ 14
5. Packing, transportation & storage ..................................................................................... 16
5.1 Supplied components ...................................................................................................... 16
5.2 Transportation & acceptance .......................................................................................... 16
5.3 Storage ............................................................................................................................ 18
6. Mounting of tap-changer on the transformer .................................................................... 19
6.1 Transformer mounting flange for tap-changer installation .............................................. 19
6.2 Mounting of SHZV on bell-type transformer .................................................................. 20
6.3 Installation of tap changer on standard type transformer ................................................ 29
6.4 The installation of plate SHZV ....................................................................................... 29
6.5 Connection between tap of voltage regulating winding and terminal of tap changer ...... 29
7. Transformer ratio test and transformer DC resistance measurement
................................. 31
7.1 Transformation ratio test .............................................................................................. 31
7.2 Transformer DC resistance measurement ....................................................................... 32
8. Drying process and oil filling
...................................................................................................... 33
8.1Drying process ................................................................................................................. 33
8.2 Oil filling ........................................................................................................................ 36
9. Installation of tap-changer protection device and transmission device components
.......... 38
9.1 Installation of gas relay ................................................................................................... 38
9.2 Use of pressure relief device ........................................................................................... 38
9.3 Installation of motor drive unit ....................................................................................... 38
9.4 Installation of bevel gear box .......................................................................................... 38
9.5 Installation of horizontal and vertical drive shafts .......................................................... 39
9.6 Installation of driving shaft shield cover ......................................................................... 41
9.7 Installation of three single phase Tap changer ................................................................ 43
9.8 Tap position calibration of tap-changer transmission system .......................................... 43
10. Tap-changer Factory test and test preparation
........................................................................ 45
10.1 Test preparation ............................................................................................................ 45
10.2Test in transformer factory ............................................................................................. 46
11. Transformer transportation and put into operation on site
.................................................... 47
11.1 Remove the MDU for transportation ............................................................................ 47
11.2 Oil filling and transportation without oil conservator ................................................... 47
11.3 Transportation without oil ............................................................................................. 47
11.4 Putting transformer into operation on site ..................................................................... 47
12. Tap-changer operation monitoring and maintenance
............................................................ 49
13. Maintenance
................................................................................................................................. 50
13.1 Inspection ..................................................................................................................... 51
13.3 Notice ........................................................................................................................... 52
14.Appendix
....................................................................................................................................... 53
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