CCSN Power Inc. diesel generator knowledge lecture: Diesel generator set in the same power range comparison of advantages between high speed and medium speed (4)
Internal combustion diesel generator sets have been in China over the past decades should be used in different areas, but the majority of users are very confused on the selection, there is no industry standards agreed with the power generating units in different scenarios should choose high-speed or medium speed Generally, users only consider parameters such as frequency, power, voltage level, power factor, etc. If they encounter a business recommendation from a manufacturer that only has low-power generator sets, they can even describe that high-speed diesel generator sets are superior to medium-speed generator sets, so that everyone can purchase them. They are suitable for the product, should be based on entirely different to be a scene from the cost of inputs, standard operation, safety and reliability, fuel economy of maintenance costs, ongoing failure rate , low-level emergency and other pre-conditions to the right choice, is the most professional and correct orientation.
Here is a comparison of the advantages and disadvantages of high-speed and medium-speed diesel generator sets:
NO. | High-speed diesel generator set | Medium speed diesel generator set |
1 | High speed machine protection means less sampling points, high piston speed; the engine often has a bad valve, scuffing, hold tile and other large fault. | Medium-speed protection means is perfect; each cylinder is monitored slower piston, completely no major fault. |
2 | The high-speed machine has high exhaust temperature, high explosion pressure in the cylinder, large thermal load and mechanical load of parts, and metal fatigue is prone to failure. | The medium-speed engine has low exhaust temperature, low explosion pressure in the cylinder, small thermal load and mechanical load on parts, and a very low failure rate. |
3 | Voltage waveform, electromagnetic compatibility, voltage sinusoidal distortion rate, The deviation coefficient and the content of each single harmonic are higher due to the 4-pole speed.
| The voltage waveform, electromagnetic compatibility, voltage sinusoidal distortion rate, deviation coefficient, and the content of each single harmonic are 6-pole speed and the coefficient is low, so the quality and efficiency of electricity are higher than 4-pole. |
4 | High-speed units with a power range of about 2000KW are generally imported units, which will increase the maintenance cost in the later period. | Due to the needs of the railway and the military, the medium-speed high-power generator sets have many long-term use cases and mature products. They belong to domestic independent brands and are equipped with multiple after-sales service networks in the country, which can greatly reduce subsequent maintenance costs. |
5 | The high-speed machine belongs to the material thermal load and the mechanical load operating in a high range, so the parts are developed and manufactured with the design concept of light weight and low cost . | Medium-speed material belonging to thermal and mechanical loads operating within the range of the most secure, reliable means therefore, a reasonable cost of the design concept of development and manufacturing. |
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Posted by: Cynthia Zhang
Reviewed and translated by: Kailon Chung
