indicates the outage time for each branch section when there are faults on the other branch sections. Outage time could be either repair time or isolation time depending on different fault locations, topology and configuration of the feeder and prote
for the primary circuit of transformer and 2. U , 2. I , 2. Z ... be equivalent whit 1. U and, other .... power up the three autotransformers which supply each phase of ...
transforms a system of alternating voltages and current into another system of alternating voltages ... Monitoring the performance of a transformer is crucial in.
monitor all useful data of distribution transformers to reduce costs. (5) Many monitoring systems .... Nameplate rating of Distribution Transformer: KVA rating: 500.
Abstract--This paper presents a new distribution trans- former monitoring system (DTMS), called Wimo, which util- izes the existing communication network, has ...
Jul 26, 2004 - For this reason, maintenance crews would periodically take transformers and circuit breakers off-line ... diagnostic system that can be used to monitor the health of the transformer and other substation equipment. ...... For protection
Oct 16, 2015 - We used the WHO's Health Economic Assessment Tool (HEAT), which calculates and monetizes reductions in .... 19, 55, and 63 seemed to protect neuronal PC12 cells from 6-OHDA, while compounds 19 and ... first class, designed to be degrad
Oct 16, 2015 - structure, NusG acts as flexible linker in the anti termination complex, that promotes elongation rates by suppressing transcriptional pausing in ...
initially computer aided automation started as substation monitoring system .... evaluation of captive power plant maintenance scheduling incorporating ... streaming video containing all electric poles of 33 kV and 11 kV transmission and.
The global power transformer market size would grow at nearly 6.1 percent CAGR during 2016 to 2024.
The global power transformer market size would grow at nearly 6.1 percent CAGR during 2016 to 2024.
by using an auxiliary winding coupled to the transformer of a cascade dc/dc fly back ... Another technique based on parallel connection of this dither signal is ...
number of gases compounds such as H2, O2, N2, CO, CO2, CH4,. C2H6, C2H4, C2H2 and C2H8. These gases are further analyzed to investigate presence of ...
Abstract: Power transformers are one of the most important electrical equipment that are used in power transmission system as they perform the function of transforming the voltage levels. Hence maintenance of power transformer is mandatory; as they a
High Voltage Electric Systems. Paris, France, August 29- September 1, 1990. âEva1uation of a Fluoroptic Thermometer as a Hot Spot Sensor for Power Transformers,â EPR1 Report EL-2443, vol. 2, Research Project 1289-1, July l981. K.. A. Wickersheim
May 22, 1998 - Abstract. The failure of a large power transformer is an area of significant concern since it can result in millions of dollars in costs as well as a possible interruption of power. Therefore, it is desirable to detect the existence of
Sep 16, 2014 - d Departamento de IngenierÃa TÂ´ermica y de Fluidos, Universidad Carlos III ... In this paper the Statistical Process Control (SPC) methodology is ...
KeywordsâWavelet, Power Transformer, EMTP, Circuit. Breaker, Monitoring .... if this kind of swing begins to develop, the monitoring system as to send an alarm signals to ....  RST Ltd, Transanal-16 user's manual, Budapest, 2001.  G.B. ...
May 5, 2013 - Abstractâ A distributed transformer networks remote monitoring system(DTRMS) is developed and constructed, for monitor and record the parameters like temperature, oil level status, of a distribution transformer. The system consists of
able to benchmark the DT measurements to abnormal operation and take action before failure. Keywords- Protection of distribution transformer, differential protection scheme. I. INTRODUCTION. In power system network distribution transformer is electri
ABSTRACT: This paper proposes a wireless ZigBee technology to monitor the parameters of the transformer. The transformer parameters such as voltage, ...
I would like to express my earnest gratitude and regards to my project guide, Professor. Susmita Das, Department ... This project is about design and implementation of a mobile embedded system to monitor and record key ... (5) Many monitoring systems
Columbia Undergraduate Science Journal
Power Transformer Monitoring System by Shreyansh Likhar Chameli Devi Group of Institutions, Electrical and Electronics Engineering Abstract – Monitoring and diagnosis of power as well as distribution transformer is the most important process for extending the life of transformer. A transformer monitoring system is already developed by Siemens which is based on SCADA system. But that system can’t be used in small scale industry because most of the industry lacks in automation. This paper presents the details of a monitoring system which is a standalone device equipped on every transformer individually and this device is able to detect phase failure, unbalanced voltage, and earth fault. Apart from these, the device can also monitor the oil level and oil temperature. The main aim of research is to develop this product and make available on economic rates. Index Terms – Power transformer protection
I. INTRODUCTION Power transformers are the important part of power system which are used to step up and down the power to make usable for electricity consumers. Transformers are vulnerable to failure due to external fault or internal fault or general ageing of parts which can lead to severe damage and results in replacement of the parts due to which the consumer suffers from longer power outage as well as high replacement of the part; it can also cause explosion and fire which is threatening to lives and property. At present following methods are used for fault detection of transformer – 1) Frequency response analysis (FRA) 2) Dissolved gas analysis (DGA) However, this method requires disconnecting the system and isolating the transformer which leads to interruption of supply. While DGA is instead an online monitoring method, it has limitations of detecting faults which associated with partial electrical discharge . There are different kinds of faults in a transformer; the internal fault is divided into two i.e. short circuit faults and incipient faults. The internal short circuit faults are caused by turn-to-turn shorting or turn-to-earth shorting in the windings of transformer. The incipient fault is developed over time as the transformer insulation deteriorates. The factors affecting Transformer failure and deterioration are the environment in which the transformer is being operated, maximum load current, lightening short circuits and switching surges.  In this paper the detailed working of the fault detection system is explained. This system continuously monitors the Transformer in real time and compares the output of transformer with the reference values i.e. of a healthy transformer. This device can monitor the voltage values and determine whether it’s a phase
failure or earth fault. Apart from this, it can also monitor temperature of oil, moisture level and oil level of transformer. At present the problem within India is regarding to the monitoring and diagnosis of transformer. Regular monitoring is not carried out by the employees. So to eradicate this problem an automatic and efficient transformer monitoring system is employed. This will help in reduction of duration of power failure. It will also help in overcoming future faults.
II. RESEARCH OBJECTIVES To design a system this can compare the output of transformer with the reference output and conclude it with healthiness or unhealthiness of transformer. To monitor the oil level of transformer in conservator. To monitor the temperature of oil.
III. DESIGN METHODOLOGY The system consists of – 1) Power supply 2) Potential transformer 3) Microcontroller AVR
Figure 1: Block diagram of system IV.I Power Supply Unit A power supply circuit consisting of a transformer along with rectifier diodes, where the leads of the secondary winding are connected to first terminals of rectifier diodes whose second terminals are connected to output of the power supply circuit.  There are basically two types of power supply i.e. linear and switched mode power supply. We are using a linear power supply here.
Figure 2: Linear power supply circuit IV.II Potential Transformer P.T is an instrument transformer which usually transforms high voltages to a value easy to handle for relays and other instruments. It also insulates the metering circuit from primary high voltages.
Instrument transformers are special kind of transformers used to measure currents and voltages.
Figure 3: Arrangement of potential transformer In this system three potential transformers are connected on low voltage side of transformer each is connected on phase and neutral. IV.III Temperature Sensor A temperature sensor is a device that collects data which relates temperature from an object or environment and converts it to a form that can be understood by device. These sensors come in many types and are used for a wide range of applications.  We are using TMP36 temperature sensor which is a digital temperature sensor The TMP36 is low power consumption, precise temperature sensor. The Celsius temperature is linearly proportional to voltage output provided by the sensor. It doesn’t require any calibration. Its accuracy is ±1°C at +25°C and ±2°C over the −40°C to +125°C temperature.
Figure 5: Atmel AVR pin outs IV.V Conservator Oil Level Indicator IV.V.I Magnetic Oil Gauge Magnetic oil gauge is used indicate the oil level in conservator of power transformer. This is a mechanical device. Magnetic oil gauge consists of mainly; float, bevel gear arrangement, indicating dial and terminals. We are using two ways for indicating oil level on device – 1) Connecting MOG with device – There are three terminals on MOG; two are phases and one is neutral. On one of the phase we are supplying single phase voltage to power the MOG. The other phase along with the common neutral is connected to the relay of the device. The working of this process is such that a MOG consists of magnetic switch which is eventually activated as the level of float falls which signals the relay to activate the alarm.
Figure 4: Temperature sensor TMP36 IV.IV Microcontroller For carrying out a specific function microcontrollers are used. A microcontroller is a device with processor and a memory that can be used as an embedded system. Most consumer products or machinery including mobile phones, automobiles and household appliances or computers are equipped with a programmable microcontroller. 
Figure 6: Connection diagram of MOG 2) Modifications in MOG and conservator – This method give the real time level of oil. We are using laser and LDR sensors to detect the level of oil and further which can be displayed by the device.
Columbia Undergraduate Science Journal
Figure 7: Side view of conservator showing the arrangement of laser and light sensor There are 5 sets of laser and light sensor which are installed circularly inside the conservator. The lasers are arranged in such a way that the float interrupt the laser penetrating the sensor. Suppose the conservator is half filled as shown in the diagram above, the float will interrupt the laser penetrating the sensor which is further sensed by the sensor and shown on the device. In this way the level of oil can be indicated.
Figure 8: Front inside view of conservator showing the arrangement of laser and light sensor. IV.VI System Development and Connections The functions of the system are to check phase failure, unbalanced voltages and earth fault. Apart from these It an also monitor the oil temperature and oil level. This can be carried out by connecting 3 potential transformers on the low voltage side of transformer to step down the voltage to a safe level which can be read by microcontroller. The microcontroller compares the output voltages of potential transformer to the reference values which is already fed in microcontroller. Further according to that the microcontroller takes the decision about the healthiness of transformer which is then displayed on LCD.
Temperature sensor is interfaced with the microcontroller to monitor the temperature of oil of transformer. The maximum values of oil are fed in microcontroller. If the oil temperature exceeds the safer value then the alarm is activated to alert the authorities. The output of Magnetic oil gauge is connected to the relay which is then connected to microcontroller. It alerts the system if the level of oil is minimum in the conservator. The another modifications in the conservator tank for monitoring the real time level of oil in this 5 lasers are used to emit lights on light sensor. The level at which float of MOG interrupt the laser penetrating the light sensor is defined as the level of oil in conservator. To display all this parameters LCD is used which is interfaced with the microcontroller. IV. CONCLUSION In this research paper we have discussed how to detect faults of power transformer. This system provides an easy way to detect faults and monitor the transformer health to avoid future major shutdown. The Power Transformer Fault Detector provides the following advantages. • A method that continuously monitor the faults or failures. • Wide range of features. • Simple to use. The testing of power transformer fault detector is under process. After that the device will then progress to product development attached to the power transformers under the collaboration with any company. REFERENCES  https://www.curtin.edu.au/research/local/docs/ipcommercialisation/power-transformer.pdf  Nweke Chisom. B (2014 august)Using GSM to Detect Fault in Microcontroller Based Power Transformer [online] ISSN: 23219653 Available: http://www.ijraset.com/fileserve.php?FID=768  Ole S. seiersen, “Power supply circuit”, U.S patent 4899271 A,Feb 6, 1990  http://www.wisegeek.org/what-is-a-temperaturesensor.htm#didyouknowout  http://www.futureelectronics.com/en/Microcontrollers/microcontr ollers.aspx