File Name: electric generator parts and functions .zip
An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. Electric motors can be powered by direct current DC sources, such as from batteries, or rectifiers , or by alternating current AC sources, such as a power grid, inverters or electrical generators.
This article is for the design, materials, manufacture, testing, and commissioning of packaged stand-by diesel engine generators intended for permanent installation in industrial plants. Self-contained enclosure shall be provided for the diesel generator set. The enclosure shall be manufactured such that all part are accessible for inspection and minor maintenance without removal of the enclosure or enclosure roof.
It shall include the following features:. The enclosure and all other items shall be designed and built by the supplier as an integral part of the entire diesel generator set, and shall perform without overheating in the environment specified. It shall be constructed of minimum gauge sheet metal, suitably reinforced to reduce vibration in the operating mode. A minimum of four doors are required. The doors shall be hinged so that they can be opened to provide complete access to the equipment inside the enclosure without removing the doors.
The side and rear panels shall be completely and simply removable to permit major service access. Doors shall be lockable. All fasteners shall be corrosion resistant. Batteries shall fit inside the enclosure and alongside the engine batteries under the generator are not acceptable. The unit shall have coolant and oil drains piped to the outside edge of the skid in an accessible location. Each drain line shall have a valve located near the fluid source.
Air Intake louvers shall be sized to provide sufficient airflow for engine combustion, engine cooling and generator cooling. The louvers shall open automatically when the engine receives the start signal and close when the engine stops. They shall also allow manual over-ride. The air intake and exhaust outlet shall be configured such that exhaust gas recirculation to the air intake will not occur under any wind direction. The V source will be provided by others.
Diesel generator set shall not generate noise in access of 85dba at a distance of 1 meter. If the sound pressure level will exceed 85 dba, the vendor shall notify the purchaser and additional cost for modification to ensure the sound pressure does not exceed 90dba at 1 meter.
Transport units heavier than 25 kg shall have eyebolts, lugs, or extension pieces clearly identifiable to be used for hoisting. A separate junction box or boxes shall be provided on the generator enclosure for connections to space heaters, temperature detectors, thermocouples, and humidity detector, if any. Generator control system shall be contained in a single control panel. Instrumentation shall be supplied by generator manufacturer as outlined in this section. Any instruments to be furnished by the generator manufacturer beyond normal generator control requirements.
The control panel shall include: a. Voltmeter 2 percent accuracy and 3 phase switch b. Ammeter 2 percent accuracy and 3 phase switch c.
Frequency meter d. Voltage regulator f. Alarm panel equipped with first out feature to indicate the following alarms and shutdowns: i Stator winding temperature s.
Duplication of instruments between the generator control panel and the engine local instrument panel shall be mutually agreed upon, driver manufacturer and generator manufacturer. All safety or protective alarms shall be wired fail-safe, utilizing field alarm and shutdown contacts that are closed and energized when the generator system is in its normal operation mode.
Electrical test procedures shall conform to IEEE Visual inspection b. Dimensional checks c. Generator Performance test d. Exciter field current e. Insulation resistance of field and armature f. Measurement of cold resistance of armature and field windings g.
Measurement of rotor impedance. Generator phase-sequence and voltage balance i. Short-circuit tests at reduced voltage to determine reactance and time constants. These tests, or certified test reports on a duplicate generator, shall be required j.
Overspeed trip k. Temperature tests l. Dielectric tests and polarization index m. The dielectric tests described in Paragraph 9. Generator rotor shall be statically and dynamically balanced at a minimum of rpm o.
Exciter rotor shall be balanced in the same manner as the generator rotor p. Mechanical run of generator and, if applicable, exciter. The generator shall be mechanically run at rated speed for a minimum of 4 hours. The job or contract non contacting probes shall be installed for the test and used to determine the vibration levels. Supplier shall be expected to prove the compatibility of the probe and test stand readout equipment.
The generator shall be run with the generator unexcited, if possible, at percent and percent of normal operating speed. After the unit has stabilized at these conditions, readings shall be recorded for vibration, oil pressure, and temperature for each operating condition.
Load tests including full load test, for 4 hours, with a load bank of adequate capacity v. Overload test w. Functional test of control panel x.
Combined operation test y. Governor response. Power System and Equipment Design Calculations. Like this: Like Loading Tags: Electrical Engineering. Show comments Leave a Reply Cancel reply.
The electric generator was invented before the correlation between electricity as well as magnetism was discovered. These generators use electrostatic principles to operate with the help of plates, moving belts which are charged electrically as well as disks to carry charge toward an electrode with high potential. Generators use two mechanisms to generate the charge like the triboelectric effect otherwise electrostatic induction. So, it generates low current as well as very high voltage due to the complexity of insulating machines as well as their inefficiency. The power ratings of Electrostatic generators are low so they never utilized for electrical power generation. The practical applications of this generator are to supply power to X-ray Tubes as well as in atomic particle accelerators. An alternate name of an electric generator is a dynamo for transmission as well as the distribution of energy over power lines to different applications like domestic, industrial, commercial, etc.
devices known as Basic AC Electric Generators. The information in this A simple generator has two basic parts – field and winding. The field is the magnetic.
This article is for the design, materials, manufacture, testing, and commissioning of packaged stand-by diesel engine generators intended for permanent installation in industrial plants. Self-contained enclosure shall be provided for the diesel generator set. The enclosure shall be manufactured such that all part are accessible for inspection and minor maintenance without removal of the enclosure or enclosure roof. It shall include the following features:.
The rotor generates a moving magnetic field around the stator, which induces a voltage difference between the windings of that stator. This produces the alternating current AC output of the generator. The following are factors that you need to keep in mind while assessing the alternator of a generator:. This cycle continues until the generator begins to produce output voltage equivalent to its full operating capacity.
Electric generator , also called dynamo , any machine that converts mechanical energy to electricity for transmission and distribution over power lines to domestic, commercial, and industrial customers. Generators also produce the electrical power required for automobiles, aircraft, ships, and trains. The mechanical power for an electric generator is usually obtained from a rotating shaft and is equal to the shaft torque multiplied by the rotational, or angular, velocity. The mechanical power may come from a number of sources: hydraulic turbines at dams or waterfalls; wind turbines; steam turbines using steam produced with heat from the combustion of fossil fuels or from nuclear fission; gas turbines burning gas directly in the turbine; or gasoline and diesel engines. The construction and the speed of the generator may vary considerably depending on the characteristics of the mechanical prime mover. Nearly all generators used to supply electric power networks generate alternating current , which reverses polarity at a fixed frequency usually 50 or 60 cycles, or double reversals, per second.