Testing of Capacitive Voltage Transformer (CVT)
Type Tests of Capacitive Voltage Transformer (CVT) These tests are done according to IS: 3156 (Part-1) Routine Tests These tests are done according to IS: 3156 (Part-1)
Testing of XLPE Cable above 33KV up to 220KV
Type Tests for XLPE Copper Cable Tests on Conductor Tests on Insulation Tests on Semiconductor Layer on the Insulation Tests on Metallic Screen Tests on Metallic Sheath Tests on Armours Tests on Outer Sheath Tests on Complete Cable Specimen Routine Tests on XLPE HV Cables Acceptance Tests on XLPE HV Cables
Ferroresonance in Potential Transformer or PT or VT
As the name suggests, ferroresonance is a resonance phenomenon related to iron. Ferro means ‘iron’. Before understanding the ferroresonance, let us recall the concept of resonance first. Suppose, we have a series RLC circuit, across which a voltage source is connected. Say a current I flowing through the circuit. VL is the voltage developed across … Read more
Amorphous Material for Transformer Core – A Complete Guide
Traditional distribution transformers use cold-rolled grain-oriented (CRGO) silicon steel for their core. However, in recent years, manufacturers have preferred using amorphous iron materials. The amorphous core material is typically an amorphous iron alloy. It is mainly an iron alloy, with a small quantity of boron and silicon. Unlike CRGO steel, the amorphous material is non-crystalline … Read more
Earth Continuity Conductor or Cable (ECC) for EHV Cables
The Earth Continuity Conductor or ECC provides an alternate fault current path in EHV installations, limiting dangerous sheath voltage and safeguarding cable insulation. Sometimes, we also call it Earth Continuity Cable. We most commonly use single-core cables for underground high-voltage transmission systems. This is because 3-core high-voltage transmission cables, mainly above 33kV, are not easily … Read more
Testing on 10MVA Power Transformer
Type Tests for the transformer Routine Tests on the Transformer Stage Inspection Tests On Core: On Coil On Tank Acceptance Tests
Type, Routine and Acceptance Tests for HV XLPE Cables
Type Tests for above 33KV up to 220KV XLPE Copper Cable Tests on Conductor Tests on Insulation 3. Measurement of Thickness of Insulation4. Measurement of tensile strength and elongation at break5. Thermal ageing in air oven6. Hot set test7. Shrinkage test8. Void and contaminants test Tests on semiconductive layers of the insulation 9. Resistivity test … Read more
Parameters of a Transformer (10MVA 66/11KV Transformer)
The clearance requirements for HV and LV terminals in the air are as follows:For 66 kV side, the phase-to-phase and phase-to-earth clearance should be 700 mm, and 660 mm respectively.For 12 kV side, the phase-to-phase and phase-to-earth clearance should be 280 mm, and 140 mm respectively. The following points should be noted for designing winding … Read more
Technical Parameters of a Potential Transformer (PT)
Some the important parameters are listed here for the reference only. The actual technical parameters of a potential transformer may be somewhat different depending on the actual requirements.
Questions on Voltage Transformer – A Complete Session
What is the Rated Voltage Factor in voltage transformers, and how is it determined? This is the ratio of the maximum operating voltage to the rated primary voltage of the PT. We have to multiply this factor by the primary rated voltage. This determines the maximum operating voltage of the PT. In other words, this … Read more