Pony motor speed control by means of resistance variation in the liquid rheostat during pump start-up operation at Kalayaan-1 pump storage power plant (KPSPP1) Philippines

Date

7-2014

Degree

Bachelor of Science in Electrical Engineering

Major Course

Major in Power Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Kristel Mae V. Villasin

Restrictions

Restricted: Not available to the general public. Access is available only after consultation with author/thesis adviser and only to those bound by the confidentiality agreement.

Abstract

Kalayaan-1 Pump Storage Power Plant (KPSPPI) uses pony motor added with liquid rheostat in starting the pump mode of the Generator-Motor Units. The liquid rheostat, which contains 5800 litres of mixtures with 0.2% of Sodium Carbonate (Na2CO3) helps the pony motor reach the synchronous speed of 300rpm. Operation of the liquid rheostat, which contains 5800 litres of mixtures with 0.2% of sodium carbonate (NA2CO3) helps the pony motor reach the synchronous speed of 300rpm. Operation of the liquid rheostat in controlling the speed of the pony motor was discussed by using the data gathered. Testing of the liquid rheostat solution was done before operating the pony motor. The resistance of the liquid rheostat was computed from the measured voltage and current from the static welding machine connected to liquid rheostat. The static welding machine has the following characteristics: Miller style No. jA-16 45.5A 230V, 60Hz together with a digital voltmeter with full scale IV, 10V, 30V. A digital clamp meter with 3A, 30A, 60A and 120A scales was used to measure the current. The gathered data showed that difference between the measured and standard resistance must not exceed 5% to avoid intolerable results in the operation of the pony motor. Addition of sodium carbonate is done if the difference exceeds 55. In line with this, temperature of the solution must not exceed 65 degree since it effects the resistance of the liquid rheostat. Affecting the resistance would also affect the sped of the pony motor. Controlling the speed of the motor depends on the current that pass through the pony motor rotor. Since the liquid rheostat is in series with the pony motor, the current is controlled by increasing or decreasing the resistance of the liquid rheostat. The resistance is increased or decreased as the movable electrodes move towards or away the fixed electrodes respectively. The resistance was varied when the pony motor current is beyond the operating current is 1300A-1600A. When the current exceeds the operating current, the liquid rheostat varies its resistance until the pony motor reaches the synchronous speed. Varying the current by means of resistance variation in the liquid rheostat controls the speed of the pony motor until it reaches the synchronous speed.

Language

English

Location

UPLB College of Engineering and Agro-Industrial Technology (CEAT)

Call Number

LG 993 2014 E64 /D47

Document Type

Thesis

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