ABSTRACT
A power transformer is a very simple device. It is a vital link in the electronic distribution system. A power transformer is associated with faults.
The design and construction of the phase fault detector is to provide simple, reliable and comprehensive electrical phase fault detections and response system. The system includes means for detecting any of the various electrical faults, such as impermissible low voltage levels, impermissible high voltage levels, phase dropouts, single phasing , phase reversals and or total power loss. The construction of a phase fault detector provides fault detections customized to the power transformer, providing power cut- off at an appropriate time after a given fault is detected. The system is able to provide the fault detections without the need for electrical power of its own. Its operations are also independent of line voltage, batteries or back-up generators. This feature of independent is achieved by the use of a pneumatic arrangement for interrupting power to the equipment.
The fault detection system is comprised of a power supply source, which contains a signal transformer, a rectifier, a filter and regulator units. The detection circuit or unit is comprised of a processor. The processor unit consist of a sensor (buzzer) and a detector (LED) and an oscillator circuit) the detection circuit also involves a soft touch switch and a relay which is meant to control the energization of the transformer. The fault in the system is initiated through the soft-touch switch, which operates the relay. The relay is normally open, and there is no power in the power transformer. The secondary of the power transformer is connected to a lamp (bulb) which is the load to the transformer and as well the indicator of the fault to the system.
According, an object of the construction is to provide an improved fault diagnosis system for power transformer, which makes it possible to instantaneously detect the timing or condition of occurrence of a fault and portion of the system in which the fault has taken place.
To this end, according to the present invention, there is provided or fault detection system for power transformer in which, in the event of a failure, the self detection function of one of the electronic devices transmits a code signal indicative of the faulty part. The code signal is directly received by the processor which in turn operates the system while activating an aural alarm so as to indicate the occurrence of fault.
In this fault detection system, when a fault has taken place in the sensor, the actuator, the associated electronic devices detects the fault by its self diagnosis function and produces the fault detection signal representing the result of the self- diagnosis.
During this project, a device is going to be constructed which senses and detects faults in the power transformers and this device will be known as a phase - fault detector. The detector will monitor sense and detect the various faults associated with power transformers.
