5.8. Vector Group Test of Transformer
In a three phase transformer, it is essential to carry out a vector group test of transformer. Proper vector grouping in a transformer is an essential criteria for parallel operation of transformers.
The magnitude can be adjusted for parallel operation by suitable choice of turn ratio, but the phase divergence can not be compensated.So for parallel operation of transformers, they are so chosen whose phase sequence and phase divergence are same. All the transformers with same vector ground have same phase sequence and phase divergence between primary and secondary. So before procuring one electrical power transformer, one should ensure the vector group of the transformer, matches with the costumer existing system or not. The vector group test of transformer confirms his or her requirements.
5.9.Insulation Resistance Test or Megger Test of Transformer This test is carried out to ensure the healthiness of over all insulation system of an electrical power transformer. Procedure of Insulation Resistance Test of Transformer are as follows:-
• First disconnect all the line and neutral terminals of the transformer.
• Megger leads are to be connected to LV and HV bushing studs to measure insulation resistance
Induced Voltage Test of Transformer
The induced voltage test of transformer is meant to check the inter turn and line end insulation as well as main insulation to earth and insulations between windings the primary winding of transformer are open circuited. A three phase voltage is applied to the secondary winding. The applied voltage must be twice of rated voltage of secondary winding in terms of magnitude and frequency.The duration of the test is kept to be 60 second.
The test must start with a voltage lower than 1/3 the full test voltage, and it must be quickly increased up to desired value.
The test is successful if no break down occurs at full test voltage during test.
5.12. Temperature Rise Test on
The second method of measuring three phase power is the useful for both balanced and unbalanced loads. By connecting a wattmeter with its current probes in series with red phase and volt probes between red and yellow phase. The second wattmeter should be connected with its current probes in series with the blue phase and the volt probes between the blue and yellow phases. By adding these two values together there total power for the system can be
...red testing at Lectromec showed that contaminants, such as water, lavatory fluid, and metal shavings, can create a bridge that can allow energy to unintentionally transfer between wires with cracked or damaged insulation for as long as 25 minutes without tripping circuit breakers. Specifically, the totalizer gauge’s wires on TWA Flight 800 had been improperly soldered together and had subsequently cracked apart, providing another opportunity for an explosive short circuit. During examination of the gauge at Honeywell, it was determined that electrical energy would cross the crack in the solder between the connector pins when slightly more than 270 volts (less than is used in lighting circuits) was applied to one of the pins. Thus, a short circuit from a higher-voltage wire to any corouted FQIS wiring could result in excess energy being transferred to the CWT.
Oscilloscope is acquainted as one of the most helpful instrument for testing circuits. It is able to show the signals at different points in the circuit. One way to inves...
Studies have shown that big changes in temperature do not affect the capability of insulation. In one experiment, materials were set to a high heat of 300 degrees Celsius. After six months in this environment, the substances were cooled to room temperature. The dielectric constant showing the level of insulation had not changed ("Teflon PTFE fluoropolymer resin" 28).
In chapter three of the current document, the analytical case studies are explained and the investigated buildings are described. Also, the observed damage in these buildings is studied.
chamber used as a control will be used to measure any changes due to air
...uctions with compressed air. Check for cracking, fraying, obvious looseness, and breaks on alternator fan and power steering pump drive belts
Before learning the methods from the computer tutorial, I was confused about certain test. B...
The experiment is taken according to proper step as mentioned in methodology of the study described in chapter three. The result and their comparisons are described through table and figures as following. Finally the experimental results are summarized at the end of the chapter.
Testing must be performed on a pre-established schedule and will be executed under supervision of the qualified individual to validate the sampling; besides, must be implemented by third party testing services, and the Instruments used for analysis should be calibrated in accordance with established procedures.
Application areas of electrical engineering industry involve control, generation, and delivery of electricity for domestic and industrial purposes. Some of the commonly used electrical engineering industry products are transformer, circuit breaker, battery charger, electric furnace transformer, dimmer switch, light switch, adapters, fuse, welding generator, MP3 player, FM modulator, power supply battery tester
In which document described in IEEE 829 would you find instructions for the steps to be taken for a test including set-up, logging, environment and measurement?
In order to decide upon the voltage and lengths of wire to use in the
...k again. Inspectors do this because over time the electricity passing through a bad wire damages the wire even more in can result in a fire. The fire could cost the owner lots of money in repairs or on appliances and furniture.
Refrigerators and stoves are the main product lines in which Atlas Eléctrica has its core competences. They are also working fine due to the production system.