2022-07-27

Introduce the uses and working principle of clamp meter cores

Normally, when measuring current with an ordinary ammeter, the circuit needs to be disconnected and stopped before connecting the ammeter for measurement. This is very troublesome, and sometimes it is not allowed to do so for normally operating motors. In this case, it is much more convenient to measure the current using a clamp meter without disconnecting the circuit. The working principle of the clamp meter iron core is as follows.

2022-07-18

What is the shape of the clamp meter core?

The shape of the clamp meter core is irregular. The working part of the clamp meter core mainly consists of an electromagnetic meter and a current transformer. The core of the current transformer is made into a movable opening and closing structure, hence the name "clamp meter". It is a portable instrument that can directly measure the current in a circuit without disconnecting the circuit. It is very convenient and widely used in electrical maintenance. By switching the gear position, the clamp meter core can be changed to different ranges. However, when the gear is open, it is not allowed to operate. Clamp meters generally have low accuracy, generally 2.5~5. For ease of use, the meter is equipped with switches for different ranges, which can measure different levels of current and voltage.

2022-07-07

How are miniature current transformers wired?

In power generation, substation, transmission, distribution, and power consumption lines, the current varies greatly, ranging from a few amperes to tens of thousands of amperes. For easy measurement, protection, and control, it needs to be converted into a relatively uniform current. In addition, the voltage on the lines is generally high, making direct measurement very dangerous. Miniature current transformers play a role in current transformation and electrical isolation. For pointer-type ammeters, the secondary current of the miniature current transformer is mostly in amperes. For digital instruments, the sampling signal is generally in milliamperes (0-5V, 4-20mA, etc.). The secondary current of the miniature current transformer is in milliamperes, mainly acting as a bridge between the large current transformer and the sampling.

2022-06-27

What are the operating rules of a micro-mutual inductor? What are some points to note?

A miniature current transformer is actually an electrical device. Therefore, when using it, we must follow certain operating rules. In terms of the operation of a miniature current transformer, what we should actually pay attention to is that when it is in a relatively normal operating state, the open-circuit operation state of its secondary circuit is actually stopped. Otherwise, it will actually generate a high voltage of several kilovolts, endangering our personal and equipment safety. Furthermore, as far as its secondary circuit is concerned, it must be grounded at one point (for maintenance).

2022-06-14

What precautions should be taken when using miniature current transformers?

There are many types of miniature current transformers, each with its own function. There are also many precautions to take when using miniature current transformers; safety must be prioritized.

2022-05-30

The quality of cast voltage transformers depends on the excitation characteristic test.

The quality of a cast voltage transformer depends on the excitation characteristic test. The excitation characteristic of the device is actually the magnetization curve of the iron core, because the test mainly looks at the relationship curve between the secondary excitation current and the applied voltage when the primary winding is open. The quality of the iron core and whether there is a short circuit between the turns can be determined by the fullness of the curve. Various performance tests of the cast voltage transformer can be performed using a volt-ampere characteristic tester, which is a multifunctional field testing instrument specifically used for testing volt-ampere characteristics, transformation ratio, error curves, and withstand voltage tests.

2022-05-13

What is the definition of a shielding mask? How is it constructed?

The shielding cover consists of support legs and a cover body, with the support legs and cover body being movably connected; the cover is spherical, and some edges of the shielding cover are provided with positioning feet, which are positioned and locked in the corresponding positions of the main board. Structurally, the shielding cover can be divided into one-piece and two-piece frames: currently, one-piece frames are commonly used, which are simple and cost-effective; two-piece frames are more expensive (one shielding frame plus one shielding frame, fastened to the shielding frame), but are convenient for later maintenance of the chips and electronic components inside.

2022-04-28

What is an electromagnetic shield?

The magnetic shield consists of support legs and a shield. The support legs are movably connected to the shield, which is spherical. The function of the shield is to prevent signals inside the shield from radiating outwards, shield external radiation, and prevent the circuit inside the shield from being affected.

2022-04-13

How to choose a manufacturer when purchasing power transformer cores?

When choosing a power transformer core manufacturer to cooperate with, in addition to considering price and quality, we must also consider the power transformer core manufacturer's supply speed and efficiency to avoid delays in the project schedule. The following is a brief introduction to this issue.

2022-03-29

Detailed explanation of the grounding points of power transformer cores?

The power transformer core is the main magnetic circuit part of the transformer. The amount of power transmitted by the power transformer depends on the material and cross-sectional area of the core. Therefore, the power transformer core plays a relatively large role during use. Below, we will talk about its grounding points.