Electrical appliances with platinum wire: transformers, welders, circuit breakers and so on.
1, transformer:
Transformer is a kind of static electrical equipment, it is through the coil energized to produce magnetic force to other electrical appliances suck up the device. Because of its size and weight, a transformer is generally very powerful.
Therefore it is necessary to use a large amount of iron core material to make the iron core coil. The core coils have poor electrical conductivity (high resistivity), so a metal called platinum wire is used to connect the wires to the conductors.
2, electric welding machine:
There are many types of electric welding machine: AC arc welding machine, DC arc welding machine and AC and DC dual-purpose arc welding machine, etc.; different types of welding requires a different power source: for example, the AC arc welding needs to be used in a three-phase 380V power supply; and DC arc welding requires only a single-phase 220V power supply can meet the requirements. can meet the requirements, etc.
3, circuit breaker:
Circuit breaker is used to distribute the current to the load circuit switching elements, its role is to distribute the no-load current in the circuit according to a certain distribution ratio or short-circuit current cut off in a timely manner; when anomalies occur in the circuit can automatically cut off the fault line and alarm to protect the safety of persons and equipment.
Platinum-rhodium wire characteristics:
Platinum-rhodium wire is a platinum-based rhodium-containing binary alloy, at high temperatures for the continuous solid solution. Rhodium can improve the alloy's thermal potential to platinum, oxidation and acid corrosion resistance. There are PtRh5, PtRhl0, PtRhl3, PtRh30 and PtRh40 alloys. Alloys greater than 20% Rh are insoluble in aqua regia.
Mainly used as thermocouple materials, PtRhl0/Pt, PtRh13/Pt, etc., used as thermocouples in the thermocouple wire, used to directly measure or control a variety of production processes within the range of 0-1800 ℃ fluid, steam and gas media, as well as solid surfaces and other temperatures.
Advantages: platinum rhodium wire in the thermocouple series has the highest accuracy, stability, temperature measurement of a wide temperature range, long service life, the upper limit of the advantages of temperature measurement. Suitable for oxidizing and inert atmosphere, can also be used in vacuum for a short period of time, but not for reducing atmosphere or containing metal or non-metal vapor atmosphere.
Reference: Baidu Encyclopedia-Platinum-Rhodium Wire