What is plasma cutting?
Plasma cutting uses a plasma torch to cut metals of various thicknesses. The Plasma Cutter blows compressed air out of a nozzle at high speed and at the same time forms an electrical arc between the nozzle and the metal to be cut. The resulting plasma is hot enough to melt the metal and the speed ensures that the molten metal is blown away from the cut.
What is plasma? Plasma Cutter Plasma Cutter,Plasma Cutting Machine,MMA Plasma Cutting Machine,Industrial Plasma Cutting Machine Changzhou Edaweld Trading Company Limited , https://www.edaweld.com
The grounding device conduction parameter tester is a portable tester with a high degree of automation. The grounding device conduction parameter tester is designed to measure the DC resistance of the portable short-circuit grounding wire and the personal protection grounding wire. The grounding device conduction parameter tester is controlled by a high-performance single-chip microcomputer, and the grounding device conduction parameter tester can realize the intelligent test process. The operation is simple and convenient, the precision is high, the test speed is fast, the retestability is good, the reading is intuitive, and the grounding device is turned on. The parametric tester is an ideal special instrument that meets the requirements of the regulations, which greatly facilitates the development of the test project and improves the working efficiency. The grounding device conduction parameter tester is a portable tester with a high degree of automation. The grounding device conducts the parameter test. The instrument is used to measure the on-resistance between the grounding conductors of various power equipments in the substation. The grounding device conduction parameter tester is controlled by a high-performance single-chip microcomputer. The grounding device conduction parameter tester can realize the intelligent test process, with small size, easy to carry, simple operation, high precision, fast test speed, good retestability, and reading Intuitive, grounding device conduction parameter tester is an ideal dedicated instrument that meets regulatory requirements.
Grounding device conduction parameter tester specification 1, measurement range: 1~200mΩ(25A) 1~600mΩ(10A)
2, test time: 1 ~ 99S (continuous adjustable) ± 5%
3, test voltage: AC <10V
4, test current: AC5 ~ 30A ± 5%
5, broken alarm: AC5 ~ 30A ± 5%
6, alarm resistance value: 1mΩ ~ 200mΩ (AC25A) (continuous adjustable) ± (5% ± 3 words)
1mΩ~600mΩ(AC10A)(Continuously adjustable)±(5%±3 words)
7, the use of conditions: ambient temperature 0 ~ 40 °C
8, relative humidity: ≤ 80% RH
9, power supply: AC220V±10%50HZ
10. Dimensions (mm): 350(w)*280(d)*145(h)
The grounding device conduction parameter tester meets the requirements of national standard GB6587-86 "General Principles of Environmental Testing for Electronic Measuring Instruments" and GB6593-86 "Quality Inspection Rules for Electronic Instruments".
The grounding device conduction parameter tester is suitable for measuring the resistance value between the housings of various motors, electrical appliances, instrumentation, household appliances, and the power supply ground. The instrument has a second-level test current (R <200mΩ (AC25A) or 200mΩ <600mΩ (AC10A)), and the test time is set (1~99S). When the measured value exceeds the set value, the ground device conduction parameter tester has a sound and light alarm function, and there is an overcurrent (AC> 30A) protection function. Grounding device conduction parameter tester refers to the grounding device should be grounded between various electrical equipment, grounding device and the various parts of the electrical connection between the electrical connection, that is, DC resistance value, also known as electrical conductivity. The reliable and effective connection between the grounding of the power equipment and the ground network is the fundamental guarantee for safe operation of the equipment. The ground lead wire is the connection part between the power equipment and the ground network. During the long-term operation of the power equipment, the connection may be affected by moisture and other factors, and the node may rust and even break, causing the ground lead and the ground The resistance of the connection point of the grounding grid is increased, which can not meet the requirements of the power regulation, so that the device may have unsafe hidden troubles during operation, and when it is serious, it will cause the device to lose ground operation. Underground grounding electrodes of the grounding device and its connection parts may also be rusted or even broken. Therefore, it is necessary to test the electrical integrity of grounding devices regularly.
The grounding device conductivity parameter tester power industry standard DL/T475-2006 "Guidelines for measuring characteristics of grounding devices" specifies that electrical continuity should be measured using a dedicated instrument. The grounding device conduction parameter tester has a resolution of 1 mΩ. The degree is not lower than 1.0. The grounding device conduction parameter tester is a portable tester with a high degree of automation. It is specially used for the electrical integrity test of grounding devices, and its technical specifications are all or better than the relevant standards. The grounding device conduction parameter tester is simple and convenient in operation, high in accuracy, fast in test speed, good in retestability, and intuitive in reading. The grounding device conduction parameter tester is an ideal special instrument that meets the requirements of the regulations, and the grounding device conducts the parameter test. The instrument greatly facilitates the development of test projects and improves work efficiency.
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To properly explain how a plasma cutter works, we must begin by answering the basic question [What is plasma? In its simplest terms, plasma is the fourth state of matter. We commonly think of matter having three states: a solid, a liquid, and a gas. Matter changes from one state to the other through the introduction of energy, such as heat. For example, water will change from a solid (ice) to its liquid state when a certain amount of heat is applied. If the heat levels are increased, it will change again from a liquid to a gas (steam). Now, if the heat levels increase again, the gases that make up the steam will become ionized and electrically conductive, becoming plasma. A plasma cutter will use this electrically conductive gas to transfer energy from a power supply to any conductive material, resulting in a cleaner, faster cutting process than with oxyfuel.
The plasma arc formation begins when a gas such as oxygen, nitrogen, argon, or even shop air is forced through a small nozzle orifice inside the torch. An electric arc generated from the external power supply is then introduced to this high pressured gas flow, resulting in what is commonly referred to as a [plasma jet". The plasma jet immediately reaches temperatures up to 40,000° F, quickly piercing through the work piece and blowing away the molten material.
Plasma system components
Power supply -- The plasma power supply converts single or three phase AC line voltage into a smooth, constant DC voltage ranging from 200 to 400VDC. This DC voltage is responsible for maintaining the plasma arc throughout the cut. It also regulates the current output required based on the material type and thickness being processed.
Arc Starting Console – The ASC circuit produces an AC voltage of approximately 5,000 VAC at 2 MHz which produces the spark inside of the plasma torch to create the plasma arc.
Plasma torch – The function of the plasma torch is to provide proper alignment and cooling of the consumables. The main consumable parts required for plasma arc generation are the electrode, swirl ring, and nozzle. An additional shielding cap may be used to further improve cut quality, and all the parts are held together by inner and outer retaining caps.
The grounding device conduction parameter tester is a connection part between the power equipment and the ground network. During the long-term operation of the power equipment, the connection may be affected by dampness and other factors, and the node may be rusted or even broken, resulting in ground lead. The resistance of the connection point between the wire and the main grounding network increases, which can not meet the requirements of the power regulation, so that the grounding device conduction parameter tester has unsafe hidden troubles during operation, and in severe cases it will cause the equipment to lose ground operation. The newly promulgated "Preventive Test Procedures for Power Safety Industrial Appliances" requires that a group of DC resistance tests must be made periodically on the portable short-circuit grounding wire and the personal protection grounding wire.