How large current generators work

How large current generators work
Power Systems Many high-current electrical devices need to accurately measure the resistance of loops in preventive tests and hand-off tests. The circuit breaker is an important electrical equipment in the power system. The national standard GB763, GB50150 and the power industry standard DL/T596 make provisions for the measurement of the circuit breaker's conductive loop resistance: DC voltage drop method should be used to measure and the current should not be less than 100A.
The resistance of the conductive circuit of the large current generator circuit breaker depends mainly on the contact resistance between the dynamic and static contacts of the circuit breaker. The existence of the contact resistance increases the loss of the conductor during power-on, so that the temperature at the contact point increases. The value of the value directly affects the current-carrying capacity during normal operation, and affects the cutting-off capability of the short-circuit current to some extent. Therefore, the circuit breaker resistance per phase is an important data for circuit breaker installation, maintenance and quality acceptance.
There are many ways to measure the contact resistance. Japanese scholar Isao Minowa proposed using superconducting quantum devices to measure contact resistance. H.Archi proposed using electrolyzer method to measure contact resistance. Polish scholar Jerzy Kaczarek proposed using third harmonic method to measure contact resistance. These methods are generally conducted under laboratory conditions. The method used by the institute. In engineering, the four-terminal method is usually used to measure the contact resistance of actual contacts.
In the past, a DC dual-arm bridge was commonly used to measure the contact resistance of a circuit breaker. However, when using two-arm bridges to measure the circuit breaker's conducting loop resistance, it is difficult to eliminate the large-resistance oxide film because the two-arm bridge measurement loop passes a weak current, and the measured resistance value is too large. However, the oxide film is easily broken at a large current and does not prevent the normal current from passing through. Therefore, the test should not be too small when using the DC voltage drop test.
The high current generator measures the effect of the circuit breaker in the loop resistance.
Power Systems Many high-current electrical devices need to accurately measure the resistance of loops in preventive tests and hand-off tests. The circuit breaker is an important electrical equipment in the power system. The national standard GB763, GB50150 and the power industry standard DL/T596 make provisions for the measurement of the circuit breaker's conductive loop resistance: DC voltage drop method should be used to measure and the current should not be less than 100A. The resistance of the breaker circuit is mainly determined by the contact resistance between the dynamic and static contacts of the circuit breaker.
The existence of the contact resistance of the large current generator increases the loss of the conductor when it is energized, and increases the temperature at the contact point. The value of the value directly affects the current carrying capacity during normal operation, and affects the cutting-off capability of the short-circuit current to some extent. . Therefore, the circuit breaker resistance per phase is an important data for circuit breaker installation, maintenance and quality acceptance.
In the past, a DC dual-arm bridge was commonly used to measure the contact resistance of a circuit breaker. However, when using two-arm bridges to measure the circuit breaker's conducting loop resistance, it is difficult to eliminate the oxide film with a large resistance because the two-arm bridge measurement loop passes a weak current, and the measured resistance value is too large. However, the oxide film is easily broken at a large current and does not prevent the normal current from passing through. Therefore, the test should not be too small when using the DC voltage drop test.
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Solvent extraction is a process to extract the oil from oil bearing materials by means of a solvent. A typical solvent used is hexane, a by-product of petroleum. The solvent extraction plant is designed to extract oil directly from oil seeds containing less than 20% oil, like soybeans, after flaking. Or it extracts oils from pre-pressed or fully pressed cake of seeds containing more than 20% oil like sunflowers, peanuts, cotton seed, palm kernels, canola, copra, castor and a variety of other materials.
The purpose of solvent plant extraction is to remove most of the oil contained in the seed. Extraction is conducted on prepared seeds or, as generally occurs in the case of high oil content seeds, the cake obtained from pre-pressing. Solvent extraction consists of a sequence of five operations:
Preparation of seeds for extraction which includes pre-pressing for high oil content seeds.
Extraction of oil from the prepared material with the aid of a food-grade solvent.
Desolventising-toasting of the de-oiled seed/meal, often combined with drying and cooling of the said meal.
Distillation, to remove the solvent from the extracted oil.
Recovery of solvent, which is reused again and again at the extractor level.


Simple in structure with stable performance;
Additional horizontal grid plate prevents the miscella from flowing back into the material cell to ensure the best extraction effect;
The wet meal is discharged by the material discharger which continuously discharges the wet meal onto the wet meal conveyor. This avoids meal bridging, un-uniform wet meal discharging and extends the serviceable life of the wet meal conveyor.
Composed of pre-extraction, extraction and draining sections. There is material turnover in the process of extraction to make the extraction uniform and thorough. Special self-cell solvent spraying ensures the best effect during extraction.
Features of the Solvent Extraction Process

Evaporation takes place in a vacuum for the best oil quality.
Extraction system can process different raw materials.
Solvent recovery system from vent gas is particularly absorbent.
With full energy conservation and repeat utilization, steam consumption is markedly reduced.
Solvent Extraction Plants Supplied by Yongsheng

In order to meet different clients` requirements, we have a wide range of equipment with capacities from 300 kg to 100 metric tons. When refined, oil grades may qualify as Grade 1, Grade 2, Grade 3 or Grade 4. There are two technologies: one is batch, the other is continuous. Normally we adopt batch-type processing for capacities less than 20 t/d. Otherwise the process adopted is semi-continuous or continuous.

We continue to research new equipment. Yongsheng develops equipment designed to be fully automatic, utilizing advanced technology that can be combined according to different clients` requirements. The latest refining equipment consists of many single units and has a self-contained heating system which saves energy since it does not use a boiler. This equipment requires a smaller workspace and costs less. Furthermore, it has a wider range of functions and can be used to produce Grade 1, Grade 2, Grade 3 and Grade 4 oil.

Vegetable Oil Solvent Extraction Plant Turnkey Project

Soybean Oil Solvent Extraction Turnkey Project,Palm Oil Solvent Extraction Turnkey Project,Sunflower Oil Solvent Extraction Turnkey Project,Plant Oil Solvent Extraction Turnkey Project

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