500kV XLPE电缆参数

500kV XLPE电缆参数BRUGG公司的产品资料HIGH VOLTAGE XLPE CABLE SYSTEMS

HIGH VOLTAGE XLPE CABLE SYSTEMS

Technical User Guide

500kV XLPE电缆参数BRUGG公司的产品资料HIGH VOLTAGE XLPE CABLE SYSTEMS

Content

1.General information on High Voltage XLPE Cable Systems ______________

1.1.Introduction _______________________________________________1.2.Cable selection process _____________________________________1.3.Service life ________________________________________________2.Cable layout and system design ___________________________________

2.1.Electrical field _____________________________________________2.2.Capacity, charging current ___________________________________2.3.Inductance, Inductive reactance _______________________________2.4.Losses in cables ___________________________________________2.5.Earthing methods, induced voltage _____________________________

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2.6.Short-circuit current capacity __________________________________102.7.Dynamic forces ____________________________________________112.8.Metallic sheath types ________________________________________113.XLPE Cable System Standards ____________________________________134.Technical data sheets ___________________________________________14

500 / 290kV XLPE Cable400 / 230kV XLPE Cable345 / 200kV XLPE Cable220 / 127kV XLPE Cable132 / 76kV XLPE Cable

5.XLPE Cable Reference Projects from Brugg __________________________20

500kV XLPE电缆参数BRUGG公司的产品资料HIGH VOLTAGE XLPE CABLE SYSTEMS

1. General information on High Voltage Cable Systems1.1 Introduction

The development of high voltage XLPE Cable Systems goes back to the 1960’s. Since then production and material technology have improved significantly, providing reliable and maintenance-free products to the utility industry.At present, numerous high voltage XLPE cable systems with nominal voltages up to 500kV and with circuit lengths up to 40km are in operation worldwide.

Cable systems are equipped with accessories, which have passed the relevant type tests pursuant to national and international standards, such as long-duration tests. As one of the first XLPE cable manufacturers worldwide Brugg Cables passed a Prequalification Test on a 400kV XLPE Cable System according to the relevant international standard IEC62067 (2001).This test required one year of operation, along with the thermal monitoring of all cables, joints and terminations installed. It was successfully completed at CESI Laboratory in Milan, Italy in

2004.

Typical sample of a 2500mm2500kV XLPE cable

Test Setup of Prequalification Test

As one of just a few providers worldwide, Brugg Cables can offer a broad range of both XLPE cables (up to 500kV) and oil-filled cables (up to 400

kV) as well as their accessories.

Modern XLPE cables consist of a solid cable core, a metallic sheath and a non-metallic outer covering. The cable coreconsists of the conductor, wrapped with semiconducting tapes, the inner semiconducting layer, the solid main insulation and the outer semiconducting layer. These three insulation layers are extruded in one process. The conductor of high voltage cables can be made of copper or aluminium and is either round stranded of single wires or additionally segmented in order to to reduce the current losses.

Depending on the customer’s specifications it can be equipped with a longitudinal water barrier made of hygroscopic tapes or powder. The main insulation is cross-linked under high pressure and temperature. The metallic sheath shall carry the short-circuit current in case of failure. It can be optionally equipped with fibers for temperature monitoring. Finally, the outer protection consists of extruded Polyethylene (PE) or Polyvinylchloride (PVC) and serves as an anti-corrosion layer. Optionally it can be extruded with a semiconducting layer for an after-laying test and additionally with a flame-retardant material for installation in tunnels or buildings if required.

1.2 Cable selection process

This broad product range together with a systematic analysis of the technical requirements enables the user to find the right solution for every

application. Additionally, our consulting engineers can assist you in the development of customized solutions.

500kV XLPE电缆参数BRUGG公司的产品资料HIGH VOLTAGE XLPE CABLE SYSTEMS

Selection process of cable design

1.3 Service life

Cables are among theinvestment goods with a high service life of over 40 years. The service life of a cable is defined as its operating time. It is influenced by the applied materials, the constructive design, the production methods and the operating parameters.

Regarding the material technology Brugg Cables has many years of experience and investigation together with extensive experience in the field of cable systems gained over the years.

Lifetime curve of XLPE cables

500kV XLPE电缆参数BRUGG公司的产品资料HIGH VOLTAGE XLPE CABLE SYSTEMS

The following rules apply for all organic insulationmaterials in general:

-An increase of the operating temperature by 8 to 10°C reduces the service life by half.

-An increase of the operating voltage by 8 to 10% reduces the service life by half.The influence of the voltage on the service life is expressedin the following service life law(see graph above):t En= const

with

E = Maximum field strength at the conductor surface of the cable

n = Exponent stating the slopet = Time

Other operating parametersof decisive importance are:

-Voltage level and transient voltages such as switch operations, lightning impulses

-Short-circuit current and related conductor temperatures

-Mechanical stress

-Ambient conditions like humidity, ground temperatures, chemical influence …… 此处隐藏：25474字，全部文档内容请下载后查看。喜欢就下载吧 ……