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Heat treatment method for high-linearity current transformer magnetic core

A technology of current transformer and heat treatment method, applied in heat treatment furnace, inductance/transformer/magnet manufacturing, heat treatment equipment, etc., can solve problems such as poor linearity of magnetic permeability of transformer magnetic core, achieve high initial magnetic permeability, improve Sampling linearity, effect of low residual magnetic flux density

Pending Publication Date: 2021-06-15
FOSHAN CITY ZHONGYAN AMORPHOUS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the above problems, the present invention proposes a high linearity current transformer magnetic core heat treatment method, which mainly solves the problem of poor linearity of the magnetic permeability of the transformer magnetic core

Method used

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  • Heat treatment method for high-linearity current transformer magnetic core
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  • Heat treatment method for high-linearity current transformer magnetic core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1. Place the transformer core to be processed in the transverse cooker and vacuum;

[0025] Step 2, the temperature of the furnace rises from the room temperature to 150 ° C, heats up for 10 minutes, then cool for 10 minutes;

[0026] Step 3, a transverse magnetic field is applied to the cooled transformer core, and the magnetic field time is 30 minutes, the magnetic field strength is 250 gs, the temperature is 350 ° C, and the temperature is maintained for 30 minutes at room temperature for 10 minutes.

Embodiment 2

[0028] Step 1. Place the transformer core to be processed in the transverse cooker and vacuum;

[0029] Step 2, the temperature of the furnace rises from the room temperature to 700 ° C, holding for 1200 minutes, then cooling for 60 minutes;

[0030] Step, a transverse magnetic field is applied to the cooled transformer core, and the magnetic field time is 350 minutes, the magnetic field strength is 7000 gs, the temperature is 700 ° C, which is 250 minutes in the furnace, and 60 minutes at room temperature.

[0031] The angular difference value is measured by the finished transformer parameters. The transformer requires the winding parameters as the line diameter φ0.11mm, the number of turns 1500Ts, the test is at the rated current 20A, the load resistor 22 ohms, the accuracy requires level 0.2, in current 2.5a The difference in the angular difference in the ~ 24A is within 2 minutes;

[0032] 1, test results under different processes

[0033]

[0034] Remarks: Materials, equipm...

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Abstract

The invention discloses a heat treatment method for a high-linearity current transformer magnetic core. The heat treatment method comprises the following steps: I, placing a transformer magnetic core to be treated in a transverse magnetic furnace, and vacuumizing; II, raising the temperature in a furnace to 150-700 DEG C from the room temperature, preserving heat for 10-1200 minutes, and then conducting furnace cooling for 10-60 minutes; and III, applying a transverse magnetic field to the cooled transformer magnetic core under the conditions that the magnetic field time ranges from 30 minutes to 350 minutes, the magnetic field intensity ranges from 250 Gs to 7000 Gs and the temperature ranges from 350 DEG C to 700 DEG C, preserving heat in the furnace for 30 minutes to 250 minutes, and cooling at the room temperature for 10 minutes to 60 minutes. The heat treatment method has the beneficial effects that a nanocrystalline current transformer magnetic core prepared by the method has high initial magnetic permeability and extremely low residual magnetic induction intensity, the sampling linearity of a transformer can be effectively improved, and the angular difference reaches + / -2 minutes.

Description

Technical field [0001] The present invention relates to the field of core heat treatment techniques, and more particularly to a high linearity current transformer magnetic core heat treatment method. Background technique [0002] The current transformer in the instrumentation is poorly magnetic in the magnetic core of the transformer magnetic core, causing the linearity of the device, and the software needs to make multi-point compensation can achieve good sampling linearity. The more compensation, the more difficult it is The higher the relative land cost, so the equipment manufacturers urgently need a high linear transformer to reduce the difficulty and cost of compensation. At present, the magnetic core and transformer produced by German VAC in the world can achieve good linearity (less than 2 points in the horizontal), and domestic manufacturers have multi-use horizontal magnetic field to resolve the linearity of transformers, although there is improved linearity ( The angle ...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/04C21D1/773H01F41/02
CPCC21D9/0068C21D1/773C21D1/04H01F41/0206
Inventor 黄剑威曹前进谢运珍
Owner FOSHAN CITY ZHONGYAN AMORPHOUS TECH