Related Manuals for GE OTCF
Summary of Contents for GE OTCF
- Page 1 Instruction Manual INSTRUCTION MANUAL NUMBER MI-ITR103 CAPACITOR VOLTAGE TRANSFORMER MODEL OTCF VOLTAGE LEVEL: 72,5kV TO 800kV © GE Grid Solutions...
- Page 2 Instruction Manual GE Grid Solutions Av. Nossa Senhora da Piedade, 1021 37504-358 Itajuba - MG – Brazil ITR069 07/12/2021 14/09/2021 04/09/2018 17/04/2015 ROCS Owner Control Revision Date Prepared Approved © GE Grid Solutions...
- Page 3 Attention! Anyone involved in the transportation, installation, commissioning, operation, and maintenance of OTCF Capacitor Voltage Transformers (CVT) should read these instructions before taking any action. Never work on high voltage equipment without first having grounded its metallic parts, since it is inherent to capacitances the possibility of electric charges accumulated with voltages at lethal levels.
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Page 4: Table Of Contents
Voltage ratio measurement ....................23 8.4. GARTON effect ......................... 24 8.5. 8.6. Capacitance and dissipation factor with temperature variation ..........25 MANTENANCE AFTER ENERGIZING ..................... 25 FINAL DISPOSAL OF THE TRANSFORMER PARTS AFTER LIFE TIME ..........26 © GE Grid Solutions... -
Page 5: Schematic Diagram
Instruction Manual 1. SCHEMATIC DIAGRAM The OTCF Capacitor Voltage Transformer (CVT) is an assembly of a capacitive voltage divider (CD) and an electromagnetic unit (EMU). Depending on the rated voltage, the CD may contain of one or more capacitive modules with an intermediate voltage terminal through a medium voltage bushing which feeds the EMU. -
Page 6: Transport, Reception, Unpacking And Storage
Example of horizontal packaging time of transportation and storage exceeds this period, it is mandatory to unpack and put the transformer in a IMPORTANT: The OTCF must always be vertical position, anchoring its basetank transported with the top modules to the ground. -
Page 7: Reception
In case of damages, the customer inspector in charge of receipt shall notify GE and the insurance representative. All contact information shall be indicated on shipment insurance documents. This declaration... - Page 8 - Gradually put the CVT in vertical position by lifting the sling placed in the neck of the insulator. Keep always the sling in vertical position. Handle with care in order do not damage the bellow flange. © GE Grid Solutions...
- Page 9 Eight or twelve sets of bolts, nuts and washers for each CD. For OTCF having manometer in the CVT handled with its package: The display box of the manometer used To lift the packaged transformer with...
- Page 10 Instruction Manual specified accuracy class. Each EMU is all OTCF models, this small protrusion tuned to a CD. In this way, it is not needs after allowed to exchange any CD module or transportation. For the cases when CD even a complete CD from one EMU to...
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Page 11: Storage
For silver or tinned contacts, only clean (do Tank anchoring to the pedestal must be done not use sandpaper) and polish the side of the using 4 (four) screws. The dimensions of the aluminum. Cleaning silver or tinned surfaces © GE Grid Solutions... -
Page 12: Connections And Accesories
5,4 kgf.m (54 N.m) must be applied. Note: The screw threads must be covered with MOLYCOTE P37 grease (or equivalent). Do not apply this © GE Grid Solutions... -
Page 13: Secondary Terminal Box
'HF' terminal. Confirm the unused secondary terminal must the position of this terminal in the be connected to the ground terminal. CVT secondary terminal box. © GE Grid Solutions... -
Page 14: Terminal Marking
At least one of the points must fluctuations in the CVT, protection be connected to the substation sparkers supplied earthing system using appropriate compensation reactor and the drain cables. coil and are located in the secondary © GE Grid Solutions... -
Page 15: Emu Potential Grounding Switch
HF terminal while the CVT is energized, carrier grounding switch located on the side of the secondary terminal box should remain in the "Closed" position as shown in the figure below. © GE Grid Solutions... -
Page 16: Line Trap Assembly
(pointer) is in both red ranges, it is an incorrect operation condition for the CVT and it must be removed from operation and GE must be informed immediately. Oil level indicator – type manometer 5.10. Line trap assembly If the CVT is used to support a line... -
Page 17: Inspection Before First Energizing
Always check the oil level indicator before taking the samples. EMU oil level indicator 7. INSPECTION BEFORE FIRST ENERGIZING Never refill oil without consulting GE. • Confirm the terminal connections to ensure 8. ON-SITE TESTS correct tightening torque on the fastening screws. -
Page 18: On-Site Test Methods
In general, on-site test equipment can measurement equipment for the provide a test voltage of up to 10 kV measurement of each capacitance of measurement purposes. an OTCF CVT. procedures and techniques are not same different test Since intermediate voltage equipment. - Page 19 Instruction Manual Figure 1 – Capacitance measurement of C1 – OTCF single module (Mode GST/Ground) Figure 3 - Capacitance measurement of C1-1 – OTCF two modules (Mode GST/Guard) Figure 2 - Capacitance measurement of C2 – OTCF single module (Mode GST/Ground) ...
- Page 20 Instruction Manual Figure 5 - Capacitance measurement of C1-1 – OTCF Figure 7 - Capacitance measurement of C1-3 – OTCF three modules (Mode GST/Guard) three modules (Mode GST/Guard) CVT with capacitive divider with four modules Figure 6 - Capacitance measurement of C1-2 – OTCF three modules (Mode UST) ©...
- Page 21 Instruction Manual Figure 8 - Capacitance measurement of C1-1 – OTCF Figure 9 - Capacitance measurement of C1-2 – OTCF four modules (Mode GST/Guard) four modules (Mode UST) © GE Grid Solutions...
- Page 22 Instruction Manual Figure 10 - Capacitance measurement of C1-3 – OTCF four modules (Mode UST) Figure 11 - Capacitance measurement of C1-4 – OTCF four modules (Mode GST/Guard) © GE Grid Solutions...
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Page 23: Voltage Ratio Measurement
See Figure 10 C1-4 See Figure 11 ATTENTION! After the test, connect again "HF" to the carrier system or close carrier grounding switch and open the potential ground switch. 8.4. Voltage ratio measurement © GE Grid Solutions... -
Page 24: Garton Effect
Instruction Manual The voltage ratio can be verified by Since the synthetic oil used by GE in applying voltage to the bellows flange the capacitive modules is a powerful of the lower capacitive module with solvent, it is inevitable that the oil the tank grounded. -
Page 25: Capacitance And Dissipation Factor With Temperature Variation
Capacitance variation with temperature substation maintenance contract. If possible, GE suggests disconnecting the perform following examination: •Insulator: Depending on the pollution level it is necessary to clean the porcelain. -
Page 26: Final Disposal Of The Transformer Parts After Life Time
Industrial landfill, properly licensed by the state’s responsible agency. The disposal of oil and components contaminated with oil directly into the soil or water is prohibited. For further information or clarifications, contact GE environment department: +55 35 36297112. © GE Grid Solutions...