When measuring the insulation resistance of water-cooled generators, what is the reason why ordinary

Introduction When measuring the insulation resistance of water-cooled generators, what is the reason why ordinary meggers cannot measure water-cooled generators? Because water is conductive when it passes through it, ordinary meggers cannot accurately measure and

When measuring the insulation resistance of water-cooled generators, what is the reason why ordinary

Since water is conductive when passing through it, ordinary meggers cannot measure accurately and the measured resistance is very low.

The insulation classification of the double water internally cooled generator is measured

1. The situation measured with a special dual-water megger is: water enters the stator through the coil; the insulation resistance should be greater than 30KΩ; The water-cooled engine should be tested with flowing water. The conductivity should not be higher than: 2.0 × 102 μS/m2 when the water temperature is 20°C. The stator coil is cleaned after the measurement.

If it is a water-cooled generator, a special water agitator should be used when measuring the insulation of the stator, and the water pipe part must be shielded and connected.

1. When measuring insulation, it is not necessary for water to pass through it. When there is noas water, the stator is qualified if measured with a megometer and above 2 M; when the water in the coil is not dried, it is measured with shielded wiring method by megohmmeter. After the water passes, it is measured with water. - Cooled motor insulation tester, and all are qualified above 6M.

2. The water collection ring and the external fixed cold water pipe are isolated by the connection flange.

3. Since the external fixed cold water pipe is grounded, what is protected is: the leakage current generated in the water after the megger is pressurized.

What is used to cool the generator of the water cooled unit? Air? You're unlikely to use water, right?

A generator that uses a hydraulic turbine as the prime mover to convert water energy into electrical energy. A hydrogenerator is made up of main componentsaux such as a rotor, a stator, a frame, a thrust bearing, a guide bearing, a cooler and a brake (see figure). The stator is mainly composed of frame, iron core, winding and other components. The stator core is made of cold-rolled silicon steel sheets and can be made into integral or split structures according to manufacturing and transportation conditions. The cooling method of hydraulic generator generally adopts closed circulation air cooling. Very large capacity units tend to use water as the coolant to directly cool the stator. If the stator and rotor are cooled at the same time, it will be a water turbine generator set with double internal water cooling.

The generator set is composed of two main parts: a main engine (diesel engine, gasoline engine, steam turbine, etc.) and a generatortor;

The so-called water-cooled unit refers to the use of water to cool the generator (not to mention the main engine, it must be cooled with water);

The water-cooled unit has dual internal water cooling and single internal water cooling; that is, both the stator and rotor are wired and internally cooled by water, which is called dual water internal cooling, only the stator is cooled with water and the rotor is cooled with hydrogen, which is a unique internal water cooling. cooling. (Large generators generally no longer use air cooling, but generally use hydrogen, because the mass of hydrogen is much smaller than that of air and its thermal conductivity is much better, which can greatly improve cooling efficiency while water has high heat capacity and better.r cooling effect, but it is difficult to enlarge it)

  • Popular Focus
  • Where is the cheapest battery wholesale?

    Where is the cheapest battery wholesale in Tangxia, Sanyuanli, Baiyun District? There is an enterprise specializing in the independent production of electric vehicles in Tangxia, Sanyuanli, Baiyun District, Baiyun Sanyuanli Avenue, Baiyun Sanyuanli Street
    08-02
  • Four 3.7V lithium batteries in series and parallel produce 7.4V/4.4A. How to reduce it to 4.8V/4.4A?

    Four 3.7V lithium batteries in series and parallel produce 7.4V/4.4A. I personally think it is impossible to reduce it to 4.8V/4.4A. Because the discharge platform of lithium batteries is generally set
    08-10
  • What are the materials of the negative electrodes of lithium batteries?

    What are the materials of the negative electrodes of lithium batteries? The main commercial applications of lithium batteries include graphite, which is a sheet of copper used to guide current and which does not react. another safe
    08-02
  • The difference between 18500 and 26500 batteries

    What is the difference between 18500 and 26500 batteries? The answer above is 18650. The person asking the question should ask what is the difference between 18505 and 26500 batteries. In the case of Fuant ER1
    08-02
  • What does 3.7V 80mAh written on a lithium battery mean?

    What does 3.7V 80mAh written on a lithium battery mean? 3.7 V, 80 mA = 0.08 A, H means 1 hour, or 3600 seconds. Taken together, it is
    08-02
  • How long does a lithium battery (cell phone battery) last?

    How long does a lithium battery (cell phone battery) last? The lifespan of mobile phone batteries, under normal conditions of use and without serious impact, the lifespan set by the manufacturer must be 5 years.
    08-02
  • Will lithium batteries explode when charging?

    Will lithium batteries explode when charged? Will lithium batteries explode when charged? Lithium battery explosions usually occur during the charging process, because the negative electrode material of lithium batteries is graphite or other carbon materi
    08-02
  • Parameters of lgdas31865 lithium battery

    Parameters of lgdas31865 lithium battery The parameters of lgdas31865 lithium battery are as follows: LGDAS31865 is a model 18650 lithium battery with a capacity of
    08-02
  • What are the main components of lithium battery electrolyte?

    What are the main components of lithium battery electrolyte? The composition of lithium battery electrolyte is shown below. 1. Ethylene carbonate: molecular formula C3H4O3. Colorless transparent liquid (>35℃), room temperature
    08-02
  • Who are the lithium battery manufacturers in Shandong?

    What are the lithium battery manufacturers in Shandong? Shandong Shengyang Power Supply Co., Ltd. and Shandong Weineng Environmental Protection Power Technology Co., Ltd. 1. Shandong Shengyang Power Supply Co., Ltd. is located in Shengyang, Qufu City.
    08-02
  • Types of drone batteries available in 2024

    Part 1. Types of drone batteries available in 2024In 2024, drone batteries have advanced significantly, offering a range of options to cater to various needs in
    07-30
  • How long does it take to charge 26650 battery?

    How long does it take to charge a 26650 battery? The charging time for a 26650 battery is generally between 3 and 6 hours, but the precise time depends on the power of the charger and the capacity of the battery. in general
    08-02
  • For what?Sure, here's an article based on the phrase "For what?

    The simple yet profound question, "For what?" often serves as a gateway to deeper reflections on purpose and intention. It is a query that invites us to delve into the reasons behind actions, decisions, and circumstances that shape our lives and the wor
    08-02
  • Choosing the Right Cart Battery

    This comprehensive guide will walk you through everything you need about cart batteries, from understanding different types to making an informed purchase decision.
    08-02
  • 30mAh~500mAh 3.7 V Li-ion Battery

    Welcome to Ufine's collection of 3.7V lithium-ion batteries ranging from 30mAh to 500mAh. Explore a diverse range of compact and lightweight batteries suitable for various electronic devices,
    08-02
  • Here are 10 essential facts about drone batteries for 2024.

    10 Key Facts About Drone Battery for 2024 In 2024, drone batteries have advanced significantly, offering a range of options to cater to various needs in the consumer, commercial, and industrial sectors. Below are the primary types of drone batteries avai
    08-02
  • Could you please explain the difference among IMR, ICR, INR, and IFR 18650 batteries?

    What is the Difference Between IMR, ICR, INR, and IFR 18650 Battery?In 18650 batteries, discerning the differences among IMR, ICR, INR, and IFR types is fundamental for tailored and efficient battery usage. These distinct
    08-02
  • Safety considerations for cart batteries

    Selecting the ideal cart battery is crucial for ensuring optimal performance and longevity of your electric vehicle or vaping device. This comprehensive guide w
    08-01