GB/T 32514.3-2016Resistance welding -- Welding current measurement for resistance welding -- Part 3: Current sensing coil (English PDF)

Foreword

GB/T 32514 "resistance welding current measurement" is divided into five parts.

- Part 1. Measurement guidelines;

Part 2. welding current measuring instrument with current sensing coil;

Part 3. Current sensing coils;

- Part 4. Calibration system;

Part 5. Confirmation of welding current measurement systems.

This part is Part 3 of GB/T 32514.

This part is drafted in accordance with the rules given in GB/T 1.1-2009.

This part uses the translation method equivalent to ISO 17657-3.:2005 "Resistance welding current measurement Part 3. Current sensing Coil ".

And the normative reference in this standard international documents are consistent with the relationship between China's documents are as follows.

GB/T 8366-2004 Mechanical and electrical requirements for solder resist welding machines (ISO 669.:2000, MOD) Measurement of welding current for resistance welding - Part 4. Calibration system (ISO 17657-4.:2005, IDT) this part is made by China Electrical Equipment Industry Association.

This part of the National Welding Technology Standardization Technical Committee (SAC/TC70) centralized.

This part of the drafting unit. Chengdu tripartite Electric Co., Ltd., Guangzhou Songxing Electric Co., Ltd., Shenzhen Peng Yu Wei Technology Co., Ltd.

Jin seven high-tech Co., Ltd., Zhejiang Ken was Electrical Co., Ltd., Tian Tian Miaji Trade (Shanghai) Co., Ltd.

1 Scope

This part of GB/T 32514 specifies the resistance current used for welding current measuring instruments or welding current measurement systems.

The current sensor coil of the ring sensor is suitable for single phase AC (50Hz or 60Hz) and DC current.

2 Normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document.

ISO 669 resistance welding resistance machine mechanical and electrical requirements (Resistancewelding-Resistanceweldingequipment-Mechanicalandelectricalrequirements ISO 17657-4 Resistance welding current measurement - Part 4. Calibration system (Resistancewelding-Weldingcur-rentmeasurementforresistancewelding-Part 4. Calibrationsystem)

3 Terms and definitions

ISO 669 and the following terms and definitions apply to this document.

Current induced coil (toroidal coil) currentsensingcoil (toroidalcoil) A multi-roll coil in which the wire is wound on a non-magnetic skeleton with a constant cross-section for detecting the magnetic flux generated by the current.

Note. The coil is wound around a skeleton and the measured current will pass through the skeleton.

Reference current sensing coil Used for calibration, with a higher current accuracy than the high accuracy specified in this section.

Conversion coefficient the ratio of the output voltage of the current sensing coil to the welding current. The unit is millivolts per kilo (mV/kA).

Note. This value is proportional to the frequency of the current measured and uses 50Hz full-wave current as the test current.

Frequency response the influence of the frequency characteristics of the test current on the conversion factor.

Accuracy

The dispersion and deviation of the conversion factor.

The output load of the current sensing coil has a large effect on the conversion coefficient value. If the output load and/or the integrator input impedance change , The conversion factor may still be biased, even if both devices have been calibrated at high accuracy levels, respectively.