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Method for measuring and calculating overload protection setting value of high-voltage motor

An overload protection and motor technology, which is applied in the direction of motor generator testing, measuring electric variables, measuring current/voltage, etc., can solve problems such as over-protection, protection failure, and inaccurate setting, and achieve outstanding substantive characteristics and operating current The setting value is accurate and reliable

Inactive Publication Date: 2010-11-24
烟台鲁宝钢管有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a method for measuring and calculating the overload protection setting value of the high-voltage motor, which mainly solves the problem that the operating current setting value of the existing motor overload protection is based on the multiple of the rated current Ied of the motor The setting is not accurate enough, and sometimes there will be protection failure or over-protection problems

Method used

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  • Method for measuring and calculating overload protection setting value of high-voltage motor
  • Method for measuring and calculating overload protection setting value of high-voltage motor
  • Method for measuring and calculating overload protection setting value of high-voltage motor

Examples

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Embodiment 1

[0019] Embodiment 1, taking the overload protection setting value of the main motor of the piercing machine and the three-roller sizing main motor produced by steel pipes as an example, the known motor rated current is Ied, the measured motor no-load current is If0, and the motor load within one working cycle Time T1 and no-load interval time T2, the maximum allowable load current of the motor can be calculated by the equivalent current method

[0020] Ifz 2 · T 1 + If 0 2 · T 2 T 1 + T 2 ≤ Ied Ifz≤Ifz.max

[0021] The maximum allowable load current Ifz.max of...

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Abstract

The invention discloses a method for measuring and calculating an overload protection setting value of a high-voltage motor. The method is characterized by comprising the steps of measurement, calculation and verification. By measuring and calculating an operating current setting value for overload protection of a high-voltage main motor by using an equivalent current method, the operating current setting value for the overload protection of the high-voltage main motor is accurate and reliable and the motor is effectively protected.

Description

Technical field: [0001] The invention relates to the technical field of electrical automation for motor overload protection, in particular to a method for measuring and calculating a high-voltage motor overload protection setting value. Background technique: [0002] At present, in the steel pipe production process, the traditional calculation method for the operating current setting value of the overload protection of the high-voltage motor such as the main motor of the piercing machine and the main motor of the three-roller sizing is set according to the multiple of the rated current Ied of the motor, which is usually taken as 1.4 times, namely: [0003] Idzj = Kk · Kjx · Ied Kf · Ki [0004] In the formula: Kk---reliability coefficient, for GL type, take Kk=1.2; Kf---return coefficient, take 0.85. [000...

Claims

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Application Information

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IPC IPC(8): H02H7/085G01R31/34G01R19/00
Inventor 王仁波
Owner 烟台鲁宝钢管有限责任公司