First, the current transformer 1, the current transformer secondary coil accurate grade and ratio should be strictly in accordance with the design requirements of the construction, no mistakes (polar marking method is: the first end of the primary coil marked with L1, the end marked with L2 The first end of the secondary coil is marked with K1 and the end is marked with K2; when the secondary coil has the intermediate tap, the first end is marked with K1, and the first tap is marked with K2, K3, etc. For CTs with multiple secondary coils, add the serial number before the mark "K" at the outgoing end of each secondary coil, such as 1 K1, 1K2...; 2 K1, 2K2.... ..Wait).
2. In order to prevent the secondary side of the current transformer from opening, the secondary side of the current transformer shall not be equipped with a fuse, and the secondary circuit wire connection is correct and reliable.
3. The secondary coil of the current transformer is reliably grounded and only one grounding point is allowed. For the differential protection circuit, the protection disk is generally grounded through the segment.
4. The secondary transformer of the current transformer that is temporarily not used is grounded after being short-circuited.
Second, the voltage transformer voltage transformer should pay attention to the polarity in the secondary wiring, distinguish the basic secondary coil and the auxiliary secondary coil. Basically, the head end of the coil is a and the end is x. The auxiliary secondary coil has a head at the end and an end at xD. The main protection is connected to a, x basic secondary coil, insulation monitoring is connected to aD, xD auxiliary secondary coil, and the neutral point of one or two is marked "D". In order to prevent the secondary side of the voltage transformer from being short-circuited, a fuse is usually installed in the PT terminal box, and the voltage transformer for excitation is not equipped with a fuse to prevent malfunction. The secondary side of the voltage transformer (neutral point, phase B) is usually grounded through the terminal block in the terminal box. The grounding point should be reliable. Do not ground more.
A slip ring is an electromechanical device that allows electricity and data to pass through a rotating assembly. A mercury slip ring uses liquid mercury as the electrically conductive element inside the rotating assembly, as opposed to traditional carbon brushes. Mercury is a better conductor of electricity than carbon, and it also has a very low contact resistance. This makes it an ideal choice for applications that require high-speed data transmission or where reliability is critical. Mercury slip rings are used in a variety of industries, including medical technology, aerospace, and defense.
Why do we choose a mercury slip ring?
A slip ring is an electromechanical device that allows electrical current to pass between rotating objects. Slip rings are often used in applications where a cable or connector would otherwise twist and tangle as the object rotates. There are many different types of slip rings, but one of the most common is the mercury slip ring. Mercury slip rings offer several advantages over other types of slip rings, including high reliability, low maintenance, and long life. Here are three reasons why we choose a mercury slip ring:
1. Reliability: Mercury is an extremely reliable material, and mercury slip rings are among the most reliable types of slip rings available. Mercury has a very low failure rate, and it is not affected by changes in temperature or humidity. This makes mercury slip rings ideal for critical applications where reliability is essential.
2. Low Maintenance: Mercury slip rings require very little maintenance. Because mercury is a very inert substance, it does not corrode or generate any corrosive gases that would affect its reliability. Mercury slip rings do not require any lubrication, and they can operate in a wide range of temperatures and environments.
3. Economical Mercury slip rings have a lifetime cost advantage over other types of slip rings as well. Generally speaking, mercury slip rings are approximately 25% more expensive per kilowatt than other types of slip rings. However, because they require less maintenance and have a greater degree of reliability than other types of slip rings, they will save you money over the lifetime of your equipment.
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