GE Kelman DGA 900 Plus - Page 4

MA-041 – DGA 900 Plus - Installation & Commissioning Manual - Rev 1.1 4-Mar-22 Page 4 of 99
List of Tables and Figures
Page
Table 3-1: Measurements & Operating Specifications .......................................................................... 10
Table 4-1: Type Tests .............................................................................................................................. 12
Figure 5-1: TMS inputs overview ............................................................................................................ 13
Figure 5-2: Option packs dataflow ......................................................................................................... 14
Figure 5-3: Hub module PCB faceplates ................................................................................................. 15
Table 5-1: DGA 900 Plus card options .................................................................................................... 16
Table 6-1: Thermal Models inputs .......................................................................................................... 17
Figure 6-1: Thermal Models wiring ......................................................................................................... 18
Figure 6-2: Magnetic mount temperature sensor ................................................................................. 19
Table 6-2: Oil temperature sensor specification ................................................................................... 19
Figure 6-3: Magnetic mount temperature sensor – installation overview ........................................... 20
Figure 6-4: Split core CT .......................................................................................................................... 21
Table 6-3: CT dimensions ........................................................................................................................ 21
Table 6-4: CT specifications .................................................................................................................... 22
Table 6-5: CT options .............................................................................................................................. 22
Table 7-1: Cooling Status inputs ............................................................................................................. 23
Figure 7-1: Cooling Banks – analogue inputs & CTs............................................................................... 24
Figure 7-2: Cooling Banks – digital inputs (25 mA max & 24 V max) ................................................... 25
Table 8-1: OLTC Monitor inputs .............................................................................................................. 26
Figure 8-1: OLTC Monitor wiring – three phase ..................................................................................... 28
Figure 8-2: OLTC Monitor wiring – single phase .................................................................................... 29
Figure 8-3: Power Converter ................................................................................................................... 30
Figure 8-4: Power Converter – specifications & dimensions ................................................................ 30
Figure 8-5: Power Converter – wiring example...................................................................................... 31
Figure 9-1: General installation layout – single transformer ................................................................ 34
Figure 9-2: General installation layout – bank of 3 single phase transformers ................................... 34
Figure 9-3: Hub module .......................................................................................................................... 35
Figure 9-4: Hub module with Thermal Models and Bushing Monitor cards ......................................... 35
Figure 9-5: Bushing Adaptor – without top cover .................................................................................. 37
Figure 9-6: Bushing Adaptor – with top cover ....................................................................................... 37
Table 9-1: GE-supplied materials ........................................................................................................... 38
Table 9-2: Customer-supplied tools ....................................................................................................... 39
Table 9-3: Coaxial cable preparation ...................................................................................................... 39
Table 9-4: Connecting to the Bushing Adaptor ...................................................................................... 40
Table 9-5: Connecting to the grounding switch ..................................................................................... 41
Table 9-6: Connecting to the Neutral CT ................................................................................................ 42
Figure 9-7: Bushing Adaptor with cap .................................................................................................... 44
Figure 9-8: Bushing Adaptor with initial threads covered in grease ..................................................... 45
Figure 9-9: Bushing Adaptor with all threads covered in grease .......................................................... 45
Figure 9-10: Liquid-tight fitting thread ................................................................................................... 46
Figure 9-11: Bushing adaptor terminal block ......................................................................................... 46
Figure 9-12: Tightening order ................................................................................................................. 47
Figure 9-13: HFCT cannot be installed if a switch is on cable from the Neutral Bushing to ground ... 48
Figure 9-14: HFCT installed on cable from the Neutral Bushing (H0) directly to ground .................... 48
Figure 9-15: Star configuration (Y-Connection) ..................................................................................... 49
Figure 9-16: HFCT installed after the switch on cable from the Neutral Bushing to ground .............. 49
Figure 9-17: HFCT – example .................................................................................................................. 50
Figure 9-18: MMTS rear view .................................................................................................................. 50
Figure 9-19: MMTS front view ................................................................................................................. 50