Professional Generator Supplier
  • Power Output And Power Absorption Difference
    Power Output And Power Absorption Difference
    In power system and circuit analysis, we often encounter the concepts of "power out" and "power absorption".  They describe the role of circuit elements in the process of power conversion and are the key to understanding and analyzing circuit behavior. This article will first give a brief answer to judging power out and power absorption, and then elaborate on the relevant principles and judgment methods. I. Brief answer In a circuit, if a component (such as a power supply or generator) provides power to other parts, we say it is "emitting power". On the contrary, if a component (such as a load or resistor) consumes power from the circuit, we say it is "absorbing power". In short, power out is the provider of power, while power absorption is the consumer of power. II. Detailed analysis Basic concept of power Power is a physical quantity that describes the work done per unit time, usually in watts (W). In a circuit, power represents the rate of power conversion, which can be the conversion of power into other forms of energy (such as heat energy, light energy, etc.), or the conversion of power between different voltage or current levels. Power out Power out is usually associated with power supply or power generation equipment. For example, batteries, generators, or AC power supplies are typical power providers. When these devices are working, they convert other forms of energy (such as chemical energy, mechanical energy, etc.) into electrical energy and provide it to the load through the circuit. In this process, the power supply or power generation device is emitting power. The calculation of emitted power usually involves the measurement of current and voltage. In a DC circuit, the emitted power is equal to the product of current and voltage (P = IV), where I is the current and V is the voltage. In an AC circuit, because the voltage and current may change over time, more complex formulas are required to calculate the average or effective power. Absorbed power Absorbed power is associated with the load element in the circuit. The load can be any device that consumes electrical energy, such as a resistor, a motor, a light bulb, etc. When current passes through these loads, the electrical energy is converted into other forms of energy (such as heat energy, mechanical energy, light energy, etc.), and the load absorbs power in this process. Similar to the emitted power, the calculation of absorbed power also involves the measurement of current and voltage. In a DC circuit, the absorbed power is also equal to the product of current and voltage (P = IV), but the voltage and current should be measured at both ends of the load. In AC circuits, the calculation of absorbed power also needs to consider the time-varying characteristics of voltage and current. Judgment method The most direct way to determine whether a circuit element is emitting power or absorbing power is to measure the voltage across it and the current flowing through it, and then calcu...
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    Oct

    28 2024
  • Performance Standard For Governors  On Engine Generator set
    Performance Standard For Governors On Engine Generator set
    PERFORMANCE STANDARD FOR GOVERNORS ON ENGINE GENERATOR SETS 1. SCOPE   This standard covers mechanical, hydraulic and electric governors used for controlling speed and/or loading of engine-driven generator systems. The system may involve a single unit or multiple units operating in parallel. It may serve as a prime or emergency standby power source. Operation may or may not be in conjunction with an external power bus.   2. REFERENCE STANDARDS.0 REFERENCE STANDARDS MIL.-STD.-705 B Frequency and voltage regulation, stability and transient response tests. IEEE 100—1988 Standard Dictionary of Electrical and Electronic terms. EGSA-101E—1984 Glossary of Standard Industry Terminology and Definitions, Electrical. EGSA-101M—1984 Glossary of Standard Industry Terminology and Definitions, Mechanical. EGSA-100M—1992 Performance Standard for Multiple Engine Generator Set Control Systems.   3. DEFINITIONS.0 DEFINITIONS   3.1 Speed Governing System.   A speed governing system consists of a speed governor and fuel metering device which controls the fuel supply to the engine. The speed governing system senses speed and perhaps load, and meters the engine fuel supply such that speed tends to remain constant or to vary with load in a predetermined manner.   3.1.1 Speed Governor. The speed governor includes those elements which are directly responsive to speed and/or load and which position or influence the action of a fuel metering device to maintain the operating speed. When operating in parallel with an independent power source such as the utility company, the governor will act to regulate load. 3.1.2 Fuel Metering Device. A fuel metering device is an element directly or indirectly positioned by the speed governor; e.g., variable displacement pumps, fuel metering pumps, carburetors and other devices that meter fuel into the combustion system. 3.1.2 Fuel Metering Device. A fuel metering device is an element directly or indirectly positioned by the speed governor; e.g., variable displacement pumps, fuel metering pumps, carburetors and other devices that meter fuel into the combustion system.  
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    Sep

    25 2024
  • Classification Methods For Generator Sets
    Classification Methods For Generator Sets
    There are many classification methods for generator sets, which can be classified into high, medium, and low-speed units based on the rated speed of the engine; According to the rated power output of the unit, it can be divided into large, medium, and small units; According to the output voltage frequency of the generator set, it can be divided into AC generator set (intermediate frequency 400Hz, power frequency 50Hz) and DC generator set. When the voltage frequency is 50Hz, the calibration voltage of small and medium-sized generators is generally 400V (three-phase) or 230V (single-phase), and the calibration voltage of large generators is generally 6.3-10.5k/V. However, the more commonly used classification method is based on the type of fuel used in the internal combustion generator set, control mode, purpose, and appearance structure. (1) Classified by fuel type ① The rated output power of gasoline generator sets is generally relatively small, usually between 0.5 and 12kw; Most of its engines use single cylinder, air-cooled gasoline engines; The output voltage is mostly single-phase 220V, with a frequency of 50Hz; In a few special places, multi cylinder, water-cooled engines with intermediate frequency (400Hz) and two-phase (380V) outputs are also used; Gasoline generator sets have a series of advantages such as small size, light weight, relatively low noise, low price, and easy mobility. They are mainly used in general situations where the load power is small and temporary emergency power supply is required (such as independent storefronts facing the street, emergency lighting for temporary power outages on small construction sites, and night lighting for lack of electricity users). When the user's load power is greater than 6kw, it is recommended to prioritize the selection of corresponding models of diesel generator sets to increase the reliability of the power supply system. ② The production cost of diesel generator sets is higher than that of gasoline generator sets of the same power level, but their working stability is better than that of gasoline generator sets, so the application field of diesel generator sets is much wider than that of gasoline generator sets. The output power of diesel generator sets varies from 1kw to thousands of kilowatts, and the output voltage is mostly single-phase 220V/50Hz or three-phase 380v/50Hz. There are also a few high-power, high-voltage, grid connected diesel generator sets. Diesel generator sets are widely used in various fields such as industry, agriculture, and national defense, and have been widely recognized by users. (2) Classified by control method ① Manual units are the most common type of units, which have automatic voltage and speed adjustment functions. Operators can start, close, open, and stop the units on site in the machine room. This type of unit is usually used as a main or backup power source. ② The self starting unit is an automatic control system added to the manual unit. When the ...
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    Aug

    30 2024
  • WINDING PROTECTION IS A KEY ISSUE  WHEN USING GENERATOR SETS.
    WINDING PROTECTION IS A KEY ISSUE WHEN USING GENERATOR SETS.
    WINDING PROTECTION IS A KEY ISSUE WHEN USING GENERATOR SETS Generator system: •Anti-condensation space heaters • Coastal Insulation protection Alternators are of course affected by this issue, essentially due to their electromechanical nature, since they contain numerous components that can fail prematurely. In addition to the mechanical risk there is the risk of electrical malfunction. The primary purpose ofgenerator setsis to provide electric current quickly and autonomously, in situations and places where the main supply has failed. As a result, they are often faced with conditions of use that do not provide an optimum environment. Extreme temperatures, humidity, dust, etc. All these aggressors are likely to speed up ageing of the genset and its different components. Resistance to the weather and demanding conditions of use is therefore essential to ensure the longevity of a generator set. In practice, we can see that for low-voltage machines excluding AVRs, the main sources of breakdown are divided evenly between the different alternator components.  DEMANDING ENVIRONMENTS Environmental stress is usually classified according to four criteria: •Humidity is a problem because it is an electrical conductor. It is therefore likely to encourage the development of potential short-circuits. Moreover, moisture tends to accumulate in the bottom of the machine, where it mixes with dust and does even more damage to the windings   Dust and other particlesconstitute another hazard, as they cause mechanical abrasion of the varnish, which will gradually lead to a deterioration in its performance. Since air circulation is used for cooling inside the alternator, the presence of particles in the environment is particularly harmful   Corrosion, especially rust due to a saline environment, is usually a factor in the premature ageing of mechanical parts and windings. Alternators used in coastal areas or in an unprotected marine environment are particularly exposed to this risk. Corrosion can also cause the build-up of deposits that may interfere with machine operation.   •In certain cases or for certain applications, generator sets can be used in environments saturated inchemicals which pose a particularly high level of attack (acids, bases, alkali). Although this rarely happens, these situations must also be taken into account   APPLICATIONS CONCERNED Although it’s difficult to generalise, we can nonetheless draw up guidelines relating to the correlation between the application for which an alternator is used, its environment and hence the required protection level. The table below summarises these considerations.   (*) Possible derating according to voltage and alternator models for TAL range (refer to catalogue). (**) Depending on the production site, the fibreglass enamelled wire solution may be replaced by another process, for example, double application of ins...
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    Jul

    25 2024
  • Correction method for Cummins generator set power on-site conditions
    Correction method for Cummins generator set power on-site conditions
    Under non-rated on-site conditions and special loads, the rated power of Cummins generator sets needs to be corrected. Dongfeng Cummins generator set price,  Xiamen ZTA Power tells what the correction methods are:   1 Power correction of ambient temperature   When the ambient temperature is too high, the air density decreases, the amount of oxygen during diesel engine combustion decreases, and the combustion efficiency decreases, thereby reducing the mechanical output power of the diesel engine; at the same time, the generator needs cold air to cool the winding when it is working. When the ambient temperature is too high, the cooling effect is reduced, and the internal temperature of the generator winding increases. In order to ensure that the winding temperature of the generator is within the allowable range, the output power of the generator must also be reduced.   The output power of diesel engines and generators of various brands is affected by the ambient temperature. Due to different designs, the correction parameters are also inconsistent; the same brand, different models, and different speed control systems have different correction parameters. Generally, the correction parameters of the original diesel engine manufacturer should be used as the standard. Usually, the power loss can be calculated according to the output power decrease of 3%~4% for every 5℃ increase in ambient temperature above 40℃. However, it should be noted that the nominal power of some manufacturers' units is based on the output power at an ambient temperature of 25℃.   2 Power correction at altitude   When the altitude increases, the air density will also decrease, which also affects the output power of the diesel engine and generator. Different brands of diesel generator sets should refer to the manufacturer's power correction curve to calculate the actual power after capacity reduction. Usually, the power loss of generator set  can be calculated according to the output power decrease of 4%~5% for every 500m increase in altitude when the altitude exceeds 1000m. However, it should be noted that the nominal power of some manufacturers' units is based on the output power at an altitude of 300m. Electronic injection diesel engines use electronic injection control technology, which controls the injection timing and injection amount of each injector through various data of the diesel engine detected by a series of sensors installed on the diesel engine. Since the electronic control unit precisely measures the intake pressure and fuel temperature of the intake manifold and controls the injection timing and injection amount, the electronic injection diesel engine has a lower power drop in high altitude and high temperature environments. Therefore, the use of electronic injection generator set in high altitude and high temperature environments can obtain greater output power and economy. 3 Power correction of nonlinear loads   Nonlinear...
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    Jul

    02 2024
  • What is the rated power factor of a generator set ?
    What is the rated power factor of a generator set ?
    1、 What is the rated power factor of a generator set ? The rated power factor of a generator refers to its ability to output effective power at its rated capacity. In practical use, the power factor of a dg generator is generally 0.8 or 1.0. Among them, a power factor of 0.8 refers to the ratio of the product of the active power output at the rated capacity of the genset to the rated capacity; A power factor of 1.0 refers to the active power output by the diesel generator at rated capacity being equal to the rated capacity. 2、 What is the impact of power factor on generators? Power factor is one of the important factors that determine the efficiency and power quality of a generator. If the power factor of the generator is low, the required reactive power will increase correspondingly when outputting the same active power, which will lead to a decrease in the power quality of the generator and may even affect the normal operation of the power system. Therefore, choosing the appropriate power factor is very important. 3、 How to improve the power factor of the generator? There are two methods to improve the power factor of a generator: one is to increase the active power of the generator, and the other is to reduce the reactive power of the generator. To increase active power, methods such as increasing generator capacity and increasing the cross-sectional area of rotor wires can be used. Reducing reactive power can be achieved through methods such as capacitor bank parallel compensation and adjusting excitation current. The specific method can be selected according to the actual situation. Conclusion The rated power factor of a generator is an important factor in ensuring its efficiency and power quality. A lower power factor may affect the power quality of the generator and the normal operation of the power system. Therefore, selecting a suitable power factor is very important. In order to improve power factor, measures such as increasing active power and reducing reactive power can be taken.
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    Jun

    06 2024
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