Current instrument ct core

Precautions for using split core current transformers   1. In order to prevent the secondary winding from causing high voltage to enter the low voltage side, damage the instrument, and cause harm to people, a protective grounding point should be set. 2. Generally speaking, the connection of split-type current transformers is connected according to the polarity reduction, so the polarity connection must be correct. Once the connection is wrong, it will lead to inaccurate measurement or even short circuit. 3. For split core current transformers that use electric energy measurement, if the secondary circuit is used, then there is no need for automatic devices. The insulation of split-type current transformers is very thick, some insulation wraps are loose, there are wrinkles between the insulation layers, and the vacuum treatment is poor, the impregnation is incomplete, and the air-containing cavity is formed, which is easy to cause partial discharge defects. Among them, split core current transformers have a wide range of applications and can be divided into the following three categories 1. Iron core coil type low-power split-type current transformer. It is a development of the traditional split-type current transformer. The split current transformer is designed according to the high impedance resistor. Under very high primary current, the fullness characteristics are improved, the measurement range is expanded, and the power consumption is reduced. The split current transformer can measure the overcurrent and full offset short-circuit current up to the short-circuit current with high accuracy without fullness. The measurement and maintenance can share a core coil type low-power split current transformer, and its output is a voltage signal. 2. Optical current transformer refers to the use of optical equipment as the measured current sensor. The optical equipment is composed of optical glass, all-optical fiber, etc. 3. Hollow coil split current transformer. It can also be called Rogowski coil current transformer. Hollow coils are often made of enameled wires evenly wound on a ring frame. The frame is made of non-ferromagnetic materials such as plastics and ceramics. Its relative magnetic permeability is the same as the relative magnetic permeability of air. This is a significant feature of hollow coils that is different from current transformers with iron cores.