Three-phase Voltage Transformer for GIS applications up to 550 kV GE offers compact VTs for GIS with a thermal capacity up to 4,000 VA. The Low Cost LFZB8-6kV Current Transformer With Good Quality are designed to avoid ferroresonance and mitigate high-frequency overvoltage conditions. The secondary circuits of a voltage transformer may not be short-circuited during operation as the voltage transformers will be thermally destroyed within seconds. Earthed voltage transformers can be operated with 1,9 x rated primary voltage for a time of 8h without exceeding the stipulated temperature limits.
The apparent power which the voltage transformer can supply to the secondary circuit without exceeding the stipulated temperature limits at rated voltage. Voltage transformers for two rated primary voltages will be delivered with a secondary change over. Current transformers moulded in selfextinguishing resin for the measurement of AC currents from 50 to 60000A.
Moulded case current transformers for the measurement of AC currents up to 3000A, with inner diameters from 15 to 80 mm. An overcurrent relay is a type of protective relay (switch) that trips a circuit breaker if a high-voltage current exceeds a certain preset value. Measuring high-voltage current directly would require insertion of measuring instrumentation into the measured circuit-an unnecessary difficulty which would draw down the very current meant to be measured.
Comparison of Measurement of Current Transformers for Accuracy Measurement at 2016. Comparison of Measurement of Current Transformers for Accuracy Measurement at 2011. Uncertainty for Current Transformers Accuracy Measurement;
Current transformer offers minimum error if 75% to 60% burden is connected to secondary. Specify rated primary current / currents (if required more than one value) Also indicate if different primary current is required for different cores. ‘AE’ manufacture current transformers in both type i.e. Live Tank Design and Dead Tank Design FIG.
Feed current to external circuit with specified accuracy at specified primary currents. A current transformer operates on the principle of balance of Ampere turns in primary and secondary winding. To protect measuring instruments against short circuit currents.
Direct measurement of current in High Voltage System is not possible because of insulation problem of measuring instruments. ‘AE’ manufactures OUTDOOR OILCOOLED CURRENT TRANSFORMERS ranging from 11kv to 220 kv. The Modern Plant situated at Ambernath is equipped with full range of testing equipments and plant & machinery to manufacture INSTRUMENT TRANSFORMERS. Current transformers are found in: Generating stations, Electrical substations Commercial electric power distribution.
Current transformers (CT) are devices that are used to transform the current from a high current into a lower current so that the power can then be measured and controlled. Open-core current transformers that facilitate assembly without disconnection in existing installations. Manufacturers of current transformers, high-voltage transformers and switchgear also use the CT Analyzer for tests during development and production.
The current transformer acts as a power source. A current transformer is passive, therefore no external power supply is connected, and what is secondary connected forms a load for the current transformer. Home » Current Transformers » CT-LS Series 1 A and 5 A Secondary Current Transformer.