Case History - 13: Using Online TEV and Ultrasonic Method
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1 Case History 13: Using Online TEV and Ultrasonic Meod Equipment Under Measurement: 1.6MVA 22kV /4V Dry type Transformer Date of Measurement: 11 June 215 Type of Partial Discharge Measurement: i) Continuous mode TEV measurement ii) Snapshot mode TEV and Ultrasonic measurement iii) Snapshot mode TEV and Ultrasonic in phase resolved measurement Measurement Equipment: i) PDM3 (TEV sensor) ii) Ultra TEV Locator (Airborne Ultrasonic sensor / TEV sensor) iii) OSM (Airborne Ultrasonic Sensor / TEV sensor in phase resolved mode) Observation: The Thermistor wire had dropped to e live part and was causing discharge.
2 COMPARISON OF ONLINE PD MEASUREMENT (BEFORE AND AFTER SDM) USING CONTINUOUS TEV SENSORS Client : A Equipment set : PDM3 / 18 Identification : Type : Dry type Substation location: 4 Storey, HT Transformer Room Measurement Date : Sensor Used: TEV sensor Serial No: Rating (kva): 1,6 kva Substation type : Indoor Measured By : Murugesan / Eric Ang Measurement type: Continuous Mode Manufacturer /Year: Alstom / 2 Operating Voltage (kv) : 22kV/4V Aircon : Continuous TEV Measurement (Before SDM _ Measured on 11 June 215) Continuous TEV Measurement (After SDM _ Measured on 14 June 215) *SDM was done on 12 June 215.
3 COMPARISON OF ONLINE PD MEASUREMENT (BEFORE AND AFTER SDM) USING CONTINUOUS TEV SENSORS (GRAPHICAL ANALYSIS) Client : A Equipment set : PDM3 / 18 Identification : Type : Dry type Substation location: 4 Storey, HT Transformer Room Measurement Date : Sensor Used: TEV sensor Serial No: Rating (kva): 1,6 kva Substation type : Indoor Measured By : Murugesan / Eric Ang Measurement type: Continuous Mode Manufacturer /Year: Alstom / 2 Operating Voltage (kv) : 22kV/4V Aircon : Graphical Analysis of continuous TEV Measurement (Before SDM _ Measured on 11 June 215) Graphical Analysis of continuous TEV Measurement (After SDM _ Measured on 16 June 215) Amplitude level () Amplitude level () 46 Number of pulses Number of pulses 1, pulses *SDM was done on 12 June 215.
4 COMPARISON OF ONLINE PD MEASUREMENT (BEFORE AND AFTER SDM) USING SNAPSHOT ULTRASONIC SENSORS Client : A Equipment set : UTL1/147 Identification : Type : Dry type Substation location: 4 Storey, HT Transformer Room Measurement Date : Sensor Used: Airborne Ultrasonic sensor Serial No: Rating (kva): 1,6 kva Substation type : Indoor Measured By : Murugesan / Eric Ang Measurement type: Snapshot Manufacturer /Year: Alstom / 2 Operating Voltage (kv) : 22kV/4V Aircon : Frequency Domain Analysis (Before SDM _ Measured on 11 June 215) Frequency Domain Analysis (After SDM _ Measured on 12 June 215) Time Domain Analysis (Before SDM _ Measured on 11 June 215) Time Domain Analysis (After SDM _ Measured on 12 June 215) Audio Analysis => High level ultrasound was detected. Audio Analysis => No Abnormal ultrasound was detected *SDM was done on 12 June 215.
5 COMPARISON OF ONLINE PD MEASUREMENT (BEFORE AND AFTER SDM) USING SNAPSHOT TEV SENSORS Client : A Equipment set : UTL1/147 Identification : Type : Dry type Substation location: 4 Storey, HT Transformer Room Measurement Date : Sensor Used: TEV sensor Serial No: Rating (kva): 1,6 kva Substation type : Indoor Measured By : Murugesan / Eric Ang Measurement type: Snapshot Manufacturer /Year: Alstom / 2 Operating Voltage (kv) : 22kV/4V Aircon : Snapshot TEV Measurement (Before SDM _ Measured on 11 June 215) Snapshot TEV Measurement (After SDM _ Measured on 12 June 215) LT 51 HT * SDM was done on 12 June LT HT
6 COMPARISON OF ONLINE PD MEASUREMENT (BEFORE AND AFTER SDM) USING SNAPSHOT TEV & ULTRASONIC SENSORS IN PHASE RESOLVED MODE Client : A Equipment set : OSMST1 /TDS214 Identification : Type : Dry type Substation location: 4 Storey, HT Transformer Room Measurement Date : Sensor Used: Ultrasonic and TEV Sensor in phase resolved mode Serial No: Rating (kva): 1,6 kva Substation type : Indoor Measured By : Murugesan/Eric Ang Measurement type: Snapshot Manufacturer /Year: Alstom / 2 Operating Voltage (kv) : 22kV /4V Aircon : Phase Resoled Mode Measurement (Before SDM _ Measured on 11 June 215) CH1 (Airborne Ultrasonic Sensor) CH3 (TEV Sensor) 2, 1,8 1,6 1,4 1,2 1, LT SENSOR PLACEMENT LAYOUT HT CH 1 Airborne Ultrasonic Sensor PASS FAIL PASS FAIL CH 3 TEV Sensor Phase Resoled Mode Measurement (After SDM _ Measured on 16 June 215) PASS FAIL CH1 using airborne ultrasonic sensor in phase resolved mode CH3 using TEV sensor in phase resolved mode PASS FAIL *SDM was done on 12 June 215.
7 OBSERVATION DURING SHUTDOWN MAINTENANCE FOR 1.6MVA DRY TYPE TRANSFORMER HT TRANSFORMER ROOM The Thermistor wire had dropped to e live part and was causing discharge. *SDM was done on 12 June 215.
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