DL/T 1999-2019 in English

VALID

Method of on-site DC partial discharge test for converter transformer

Issued on:2019-06-04
Implemented on:2019-10-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $190.00
$185.00

Standard No:	DL/T 1999-2019
Document status:	VALID
Title in English:	Method of on-site DC partial discharge test for converter transformer
Title in Chinese:	换流变压器直流局部放电测量现场试验方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2019-06-04
Implemented on:	2019-10-01
Professional Classification:	DL-Electricity
Related Keywords:	partial discharge test partial discharge partial discharge pulses corona discharge effective discharge pulses
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Introduction

Analysis of the core content of the standard

This standard establishes a technical system for on-site testing of DC partial discharge of converter transformers for the first time, focusing on solving the following key problems:

Differences in DC discharge characteristics: Compared with AC partial discharge, DC partial discharge pulses are characterized by strong randomness and low repetition rate (about 3 orders of magnitude lower)
On-site interference control: It stipulates the identification methods and suppression measures of 6 types of interference sources, including special problems such as corona discharge and spatial interference
Test severity: It is required to directly boost the voltage to the test voltage (pre-pressurization is not allowed), and 800kV equipment must be tested for 90 minutes

Comparison of key technical parameters

Voltage level	Grading ring diameter (mm)	Standing time (h)
96	Factory value 85%
500kV	600	72	Factory value 85%
800kV	1600	96	Factory value 85%

Typical application case

±500kV converter transformer, after the differential signal method in Appendix B was used:

Spatial interference was reduced from 1500pC to 300pC

Corona discharge of the valve side bushing grading ring was effectively identified (UV imaging confirmation)

The test was passed after replacing the 800mm diameter grading ring

Implementation suggestions

Equipment selection: The ripple factor of the DC generator must be <3%, and the partial discharge instrument must have the function of pulse polarity identification

Environmental control: The test should be suspended when the relative humidity is >80%, and the oil temperature should be maintained in the range of 10-30℃

Safety protection: During the 800kV test, the angle between the high-voltage lead and the ground is ≥60°, and the surface field strength of the grading ring is ≤13kV/cm

Data interpretation: Pay attention to distinguishing between effective discharge pulses (opposite polarity) and external interference (same polarity)

More samples: GB 50021-2001(2009) NB/T 47013.2-2015 DL/T 5154-2012

Sample only — not a preview of DL/T 1999-2019

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