🔥🔥 Don’t Miss Out on Our End of Autumn Sale. If you have any questions, feel free to click the bottom right corner to contact our customer service..

Concat us[email protected]
Shopping Cart

No products in the cart.

🔍
BSI PD IEC/TS 60815-4:2016

BSI PD IEC/TS 60815-4:2016

$167.15

Selection and dimensioning of high-voltage insulators intended for use in polluted conditions – Insulators for d.c. systems

Published By Publication Date Number of Pages
BSI 2016 34
PDF Format Searchable Printable Preview Now
Guaranteed Safe Checkout
Categories: ,

If you have any questions, feel free to reach out to our online customer service team by clicking on the bottom right corner. We’re here to assist you 24/7.
Email:[email protected]

This part of IEC 60815 , which is a Technical Specification, is applicable as first approach for the determination of the required d.c. Unified Specific Creepage Distance for insulators with respect to pollution. To avoid excessive over or under design, existing operation experience should be compared and eventually additional appropriate tests may be performed by agreement between supplier and customer.

It is applicable to:

  • Glass and porcelain insulators;

  • Composite and hybrid insulators with an HTM or non-HTM housing.

This part of IEC 60815 gives specific guidelines and principles to arrive at an informed judgement on the probable behaviour of a given insulator in certain pollution environments.

The structure and approach of this part of IEC 60815 are similar to those explained in Part 1, but adapted for the specific issues encountered with polluted HV d.c. insulation.

The aim of this Technical Specification is to give the user simplified means to:

  • Identify issues specific to d.c. applications that can affect the choice and design process;

  • Determine the equivalent d.c. Site Pollution Severity (SPS) from measurements, correcting for electrostatic effects, diameter, pollution distribution and composition;

  • Determine the reference USCD for different candidate insulating solutions, taking into account materials, dimensions and risk factors;

  • Evaluate the suitability of different insulator profiles;

  • Discuss the appropriate methods to verify the performance of the selected insulators, if required;

This simplified process is intended to be used when comparable operational experience from existing d.c. system is incomplete or not available.

The simplified design approach might result in a solution that exceeds the physical constraints of the project. More refined approaches for such cases, e.g. using a statistical approach, are given in the CIGRE d.c. guidelines [1]. In extreme cases, e.g. for exceptionally severe site conditions, alternative solutions such as changing the line route, relocation of converter stations or using an indoor d.c. yard may need to be considered.

PDF Catalog

PDF Pages PDF Title
4 CONTENTS
6 FOREWORD
8 INTRODUCTION
9 1 Scope
2 Normative references
10 3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
11 3.2 Abbreviated terms
4 Principles
4.1 General
12 4.2 Overall design process
Figures
Figure 1 – Overall design process for d.c. insulation – determination of d.c. Site Pollution Severity
Tables
13 5 Materials
Figure 2 – Overall design process for d.c. insulation – determination of the required USCDdc for candidate insulating solutions
14 6 Site severity determination
6.1 Input data
6.2 d.c. pollution accumulation correction: Kp
15 6.3 Chemical composition of the pollution layer (Type A pollution)
6.4 Correcting for NSDD (Type A pollution)
Table 1 – Typical ranges of Kp according to climatic conditions
16 6.5 Correcting for CUR (Type A pollution, cap and pin insulators)
6.6 Effect of diameter on the pollution accumulation Kd
6.7 Correction for the number of similar insulators in parallel: Ks
17 7 Determination of the reference d.c. site severity
18 8 Determination of the reference d.c. USCD
Figure 3 – RUSCDdc as a function of d.c. site pollution severity
19 9 Correction of the RUSCD for each candidate insulator
9.1 Correction for the effect of diameter on pollution withstand performance Cd
20 9.2 Correction for altitude Ca
9.3 Determination of the required USCD for each candidate
Figure 4 – Correction for the effect of diameter on d.c. pollution withstand performance
21 10 Checking the profile parameters
10.1 General
10.2 Alternating sheds defined by shed overhang
22 10.3 Spacing versus shed overhang
10.4 Minimum distance between sheds
23 10.5 Creepage distance versus clearance
24 10.6 Shed angle
10.7 Creepage factor
25 11 Design verification
11.1 General
11.2 Operating experience
11.3 Laboratory testing
26 Annex A (informative) Hydrophobicity transfer materials
A.1 Qualitative flashover behaviour
Figure A.1 – Dependency of specific flashover voltage over conductivity of an electrolyte (parameter: wettability of surface)
28 Annex B (informative) Dependence of USCD on pollution severity
B.1 Pollution type A
Figure B.1 – d.c. overhead lines. Collected field experience on non HTM insulators (uncoated glass and porcelain insulators)
29 Figure B.2 – d.c. overhead lines. Collected field experience on HTM insulators (composite line insulators)
30 B.2 Pollution Type B
Figure B.3 – Composite insulators: Example of the influence of CF on USCD (laboratory tests), see CIGRE Brochure [1] for more details
31 Bibliographic References
BSI PD IEC/TS 60815-4:2016
$167.15