DL/T 1387-2014 in English

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Standard No:	DL/T 1387-2014
Document status:	VALID
Title in English:	Selection Guidelines for Winding Wire in Power Transformer
Title in Chinese:	电力变压器用绕组线选用导则
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2014-10-15
Implemented on:	2015-03-01
Professional Classification:	DL-Electricity
Related Keywords:	winding wire standard winding wire oil-immersed transformer winding flat wire power transformer introduction analysis
Related Topics:	Voltage and conductance select power transformer Transformer conductance voltage conductance voltage winding wire Power Transformer Energy Saving Certification Rules Guidelines for selection of power transformers gb/t17627-2019 Relay selection principles Pressure gauge selection and use Selection and use of negative pressure gauge Selection of pressure gauge range Use a double voltmeter to determine the transformer connection group What mold is used to crimp 300 wires in a substation? Pressure gauge range selection Pressure gauge selection standards Selection criteria for pressure gauge range Pressure gauge selection Transformer winding insulation resistance test method Pressure gauge range selection standards The pressure gauge range is selected from the international

本标准适用于电压等级为110(66)kV~1000kV交流油浸式电力变压器、电抗器和电压等级为±800kV及以下直流换流变压器和油浸式平波电抗器。

Introduction

Analysis of the core content of the standard

Winding wire type	Applicable voltage level	Key performance indicators	Typical applications
Paper covered copper flat wire	110kV-1000kV	R_p0.2≥80N/mm², breakdown voltage 2-4kV	AC oil-immersed transformer winding
Transposed conductor	±800kV and below	Transposition pitch S≤π×D, with a withstand voltage of 500V between strands	High current low voltage winding

Typical data comparison:

Insulating paper for 750kV and above: density 0.95±0.05g/cm³, breakdown strength ≥9.5kV/mm
Thermal modified paper: thermal grade 120℃, ash content ≤0.5%, specially used for DC converter
Mesh belt: warp density ≥10 pieces/cm, breaking force ≥120N

Selection process: First determine the insulation thickness → Select the conductor type → Optimize the specifications → Verify the short-circuit resistance
Special applications: ±800kV transposed conductors need to undergo a 190℃ high-temperature breakdown test (≥2kV)
Quality control: Paint film thickness tolerance ±0.02mm, wrapping overlap width ≥2mm

This standard introduces for the first time:

Structural specifications for stepped/inner-shielded combined transposed conductors
Semi-hard copper conductor grading system (CPR1-CPR3)
Shielding layer treatment requirements for mesh-wrapped transposed conductors

More samples: DL/T 368-2010 JJG 21-2008 DL/T 5154-2012

Sample only — not a preview of DL/T 1387-2014

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