Madhya Pradesh’s first underground EHV cable

India, Bhopal: MPPTCL has energized an EHV line by way of an underground cable, the first of its kind in India’s state of Madhya Pradesh. The first time in India’s state of Madhya Pradesh, Madhya Pradesh Power Transmission Company Ltd (MPPTCL) has energized an EHV line using an underground cable.

State power utility MPPTCL said that the state’s first 132 kV underground line has been energized in the capital city of Bhopal. The 132 kV double-circuit underground line measuring around 2.1 km runs from the 13 2kV Chambal substation Bhopal to the 132 kV Subhash Nagar receiving substation (RSS). This is the first time that EHV underground cable technology has been utilized in Madhya Pradesh’s power transmission sector. Also, the 132 kV cable was remotely energized from MPPTCL’s Bhopal SCADA centre utilizinh Human Machine Interface (HMI) technology. Source: T&D India

ELECTRICAL TESTING TYPE TYPICAL

CABLE TESTING Standard: IEEE 400.2, IEC 60060-3, IEEE P400.2. 1. Cable sheath Testing 2. Insulation Resistance Testing

3. VLF AC withstand test 4. DC Hipot of Cables 5. Cable Fault Localization 6. Pin Pointing of fault in cables and Route Tracing, 7. Partial Discharge (PD) measurement ( Online/ offline) 8. Cable Identification. 9. VLF Testing available upto 132kV cable TRANSFORMER TESTING Standard : IEC 60270 (for PD) , IEC60060-1 IEC 1. Turns Ratio and Vector Group Measurement 2. Magnetic Balance and Magnetizing Current Measurement 3. % Impedance Measurement at Low Voltage Insulation Resistance & Polarization Index Measurement. 4. DC Winding Resistance Measurement. 5. Dynamic Contact Resistance Measurement of OLTC SFRA ( Sweep Frequency Response Analysis ) Testing 60060-3,IEC 6. Tan Delta and Capacitance Measurement. 7. Partial Discharge ( PD) Measurement (Online & Offline) 8. Magnetic Circuit ( Insulation ) Test 9. Functionality Check of all Protective Devices stability Check 10. Oil Analysis ON LINE MOTOR TESTING – 1. Motor Current Signature Analysis (MCSA) 2. Vibration Analysis 3. Ultrasonic Detection 4. Thermography (IR) 5. Partial Discharge (PD) 6. Bearing Problem Analysis OFFLINE MOTOR TESTING STATOR 1. Surge Test upto 50kV 2. Insulation Resistance & Polarization Index Measurement 3. Dielectric Absorption Test 4. Step Voltage Test 5. DC / AC Hipot Test 6. Impedance Test 7. Bearing Problem Analysis 8. Current Frequency response 9. Phase Angle 10. Winding Resistance Measurement 11. Partial Discharge Measurement 12. Capacitance and Tan Delta Measurement ROTOR 1. Insulation Resistance & Polarization Index Measurement 2. Impedance Measurement 3. Winding Resistance Measurement. GENERATOR TESTING 1. Insulation Resistance and Polarization Index. 2. Capacitance and Tan Delta Measurement 3. Partial Discharge Measurement 4. DC/AC Leakage Current Measurement (Hipot ) 5. DC Winding Resistance Measurement SWITCHGEAR TESTING 1. Surface Tracking 2. Corona 3. Partial Discharges within insulators and insulating components 4. Defective insulations in cable terminations 5. Surface contaminations or moisture 6. Defective potential transformers and current transformers 7. Defects in circuit breaker insulation structure RLA (RESIDUAL LIFE ASSESSMENT) STUDY OF TRANSFORMER 1. Online test i.e. Infrared thermography, External inspection, routine oil tests of main tank and LTC, DGA & Furan. 2. Operation of fan and pumps. 3. Offline tests i.e. Capacitance and tan delta, ratio, Winding resistance Insulation resistance, polarization index, magnetic balance, SFRA, DCRM of LTC etc. 4. Moisture analysis of paper insulation METHOD UTILIZED FOR THE DETECTION OF PARTIAL DISCHARGE: 1. Acoustic : Band Width- 20kHz – 300kHZ 2. TEV ( Transient Earth Voltage) : Band Width – 3MHZ-100 MHZ 3. UHF ( Ultra High Frequency) : Band Width – 300MHZ- 1500MHZ 4. HFCT ( High Frequency Current Transformer) : Band Width – 500kHz – 50 MHZ 5. Ultrasonic : Band Width – 40kH POWER QUALITY MONITORING & ANALYSIS Standard: IEC 61000-4-30 1. It can record and analyze different types of power quality parameters such as voltage, current, harmonic, frequency, fluctuation, flicker, swell, sag, power and three-phase unbalance of power supply line OVER CURRENT/EARTH FAULT RELAY(50/51/50N/51N/67/67N) 1. Pickup , Drop off & Threshold Test 2. I-t characteristics curve test 3. MTA test of Directional Relays,Tracing of Angle Limit 4. Curve Analysis DIFFERENTIAL RELAYS(87) 1. IDIFF.Pickup Test 2. Stability Check,Biasing ,Over Flux Test 3. 3rd Harmonic Test 4. Analysis of ID-IR graph & Restraining Characteristics OVER/UNDER VOLTAGE RELAYS(27/59/91) 1. Delta Ramp Test 2. Pickup,Drop off Test 3. Zone test of Voltage Directional Relay 4. Curve Analysis DISTANCE RELAYS(21) 1. Impedance Evaluation in Z-plane 2. Finding the R/X characteristics&Z-t diagram 3. Testing of the voltage dependent overcurrent starting function 4. of distance relays