What are the test techniques for EHV cable sheath faults?

2022/07/11

Author: Noyafa–CCTV Tester

What are the test techniques for EHV cable sheath faults? The operation mode of extra-high voltage cable (single-core cable) stipulates that the sheath (or sheath, shield) can only be grounded at a single point to eliminate the formation of induced voltage and circulating current. The sheath single-point grounding usually uses two types of square EHV cable sheath faults. What are the test techniques? The operation mode of ultra-high voltage cable (single-core cable) stipulates that the sheath (or sheath, shielding layer) can only be grounded at a single point to eliminate the formation of induced voltage and circulating current. Two schemes are usually used for single-point grounding of the sheath: (1) When the cable length is short, one end is directly grounded, and the other end is grounded through the sheath voltage protector; (2) When the cable is long, one end is directly grounded, and the other end is grounded. Use cross-connect method.

The fault of the EHV cable sheath is a ground fault, that is, there is a second grounding point. The traditional methods are: bridge method for distance measurement, acoustic measurement method or step voltage method for positioning. Due to the great influence of the environment, the fixed-point effect of the acoustic measurement method or the step voltage method is not good, which is time-consuming and labor-intensive.

The EHV cable sheath fault tester is a new principle of EHV cable sheath fault location device. The bridge method does not require a reference loop and does not require a proportional calculation! Compared with the traditional acousto-magnetic synchronous acoustic measurement point, it is not disturbed by ambient audio noise! Compared with the traditional step voltage method, which is limited to the fixed point of the directly buried cable, this device is suitable for various cable laying conditions! Three functions of pre-positioning, path and fixed point in one! 1. Equipment composition and function The ultra-high voltage cable sheath fault tester consists of the following three parts: 1) Wireless remote control integrated high-voltage source 2) Ultra-high voltage cable sheath fault tester 3) When locating the fault of the high-voltage bridge: the high-voltage source and the The faulty cable to be tested is reliably connected to form the high-voltage shock circuit of the system; When the fault is located: the intelligent visual and noise-free fixed point instrument detects the oscillating wave signal along the tested cable, and intuitively judges the location of the fault point according to the LCD Chinese display.

CONTACT US
Just tell us your requirements, we can do more than you can imagine.
Send your inquiry

Send your inquiry

Choose a different language
English
Magyar
Ελληνικά
한국어
Türkçe
русский
italiano
Español
Português
Polski
français
Deutsch
日本語
Nederlands
Tiếng Việt
ภาษาไทย
Latin
العربية
简体中文
繁體中文
Afrikaans
አማርኛ
Azərbaycan
Беларуская
български
বাংলা
Bosanski
Català
Sugbuanon
Corsu
čeština
Cymraeg
dansk
Esperanto
Eesti
Euskara
فارسی
Suomi
Frysk
Gaeilgenah
Gàidhlig
Galego
ગુજરાતી
Hausa
Ōlelo Hawaiʻi
हिन्दी
Hmong
Hrvatski
Kreyòl ayisyen
հայերեն
bahasa Indonesia
Igbo
Íslenska
עִברִית
Basa Jawa
ქართველი
Қазақ Тілі
ខ្មែរ
ಕನ್ನಡ
Kurdî (Kurmancî)
Кыргызча
Lëtzebuergesch
ລາວ
lietuvių
latviešu valoda‎
Malagasy
Maori
Македонски
മലയാളം
Монгол
मराठी
Bahasa Melayu
Maltese
ဗမာ
नेपाली
norsk
Chicheŵa
ਪੰਜਾਬੀ
پښتو
Română
سنڌي
සිංහල
Slovenčina
Slovenščina
Faasamoa
Shona
Af Soomaali
Shqip
Српски
Sesotho
Sundanese
svenska
Kiswahili
தமிழ்
తెలుగు
Точики
Pilipino
Українська
اردو
O'zbek
Xhosa
יידיש
èdè Yorùbá
Zulu
Current language:English