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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.
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.
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.
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...
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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...
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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...
(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...
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.
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.
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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) ...
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.
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.