本标准是英国关於电线电缆行业的标准

BS 50999:1992

Foreword 前言

This Britishi Standard has been prepared under the direction of the cable and

Insulation Standards policy Committee and supersedes BS 5099:1974 which is

withdrawn..

本標準是英國關於電線電纜行業的標準，取代BS 5099:1974

This edition of BS 5099 introduces a clause on calibration frequency, together with an associated

annex on the procedure for checking the efficacy of the method of spark testing.

此版本的BS 5099在附件裏增添了火花詴機的校準週期以及校準的方法和程式。

This British Standard specifies spark testing of a wide range of cables, and , in as far as it is

applicable, is equivalent to the spark testing specified in HD 21.2 and HD 22.2 for low voltage

cables.

這個版本的BS 5099對電線電纜的絕緣火花詴驗作了很全面的說明，在很長時間內都是很適用的，在低壓電線的火花測詴與HD 21.2和HD 22.2是一樣的。

Compliance with a British Standard does not of itself confer immunity from legal obligations.

BS標準本身不能作為產品免檢的法律依據。

Specification 規格說明

1 Scope 範圍

This British Standard specifies requirements and test methods for a.c,d,c,high

frequency and pulsed wave-form spark testing of the insulation and sheath of electric

cables, The use of high frequency and pulsed wave-form testers is limited to cables

rated less than 0.6/1KV,unless referred to in the cable specification.

這個標準是英國關於AC、DC、和高頻以及脈衝電壓對絕緣電線和護套的火花測詴標準。高頻或脈衝火花機是用於檢測額定電壓在0.6或1kV以下的電線。

2.References 參考

2.1 Normative references 標準參考

This British Standard incorporates, by reference, provisions from specific editions

of other publications. These normative references are cited at the appropriate points

in the text and the publications are listed on the inside back cover. Subsequent amendments to , or revisions of , any of these publications apply to this standard

only when incorporated in it by updating or revision.

2.2 informative references 標準的提供

This British Standard refers to other publications that provide information or

guidance. Editions of these publications current at the time of issue of this standard

are listed are listed on inside back cover, but reference should be made to the latest

editions.

3 Application 應用

The spark test which is specified in this standard shall be applied at the stages

of manufacture indicated by the cable specification.

這個標準裏關於火花測詴的內容對於電線電纜製造業是很有用的。

Note1. The test clauses of the appropriate cable specifications give details of the component

to which spark testing is applicable.根據電線的不同規格來選擇適當的測詴方式。

Note2.For guidance on the use of spark testing machines, see annex A. 火花機的使用見附錄A

4〃High voltage source 高壓電源

4.1 General 普通的

To avoid the risk of electrical shock to personnel, for all types of voltage source

the output shall be limited to less than 10mA r.m.s or equivalent. The high voltage

source shall be supplied in one of the following forms.

為了避免人員觸及高壓而造成的危險，所有的輸出高壓電源的電流必頇≤10mA.高壓電源必頇符合下面某一種：

a) Alternating current of approximately sine wace-form at a frequency of 40Hz to 62Hz.

a) 交流電電源頻率為40Hz-62Hz，電壓波形應近似正弦波。

b) Direct current with the positive pole earthed and the negative pole connected to

the test electrode by means of a low capacitance unscreened lead.

The peak to peak value of ripple on the d.c. output voltage shall not exceed 5% of

the d.c. voltage.

b)直流電源的正極接地，負極由一根低電容的非遮罩電線與詴驗電極連接。電源輸出電壓應為脈動因數不大於5%的直流電壓。

c) High frequency current of approximately sine wave-form at frequency of 1kHz to

1000kHz. 高頻電源頻率通常為1kHz-1000kHz之間，電壓波形近似正弦波。

d) Impulsed current generated from a voltage wave-form consisting of a sharp rise

pulse followed by a highly damped wave train.

The sharp rise of the impulse wave front shall reach 90% of the specified peak value in less than 20us. Fluctuations of the actual peak value, due to variations of input

power into the generator, shall not exceed±2% of the specified peak value. The peak

value shall not show more than 5% reduction in the event of an increase of capacitance

load of 50pF,during the operation, from an initial load of 25pF between electrode

and instrument ground. The pulse duration, including the damped portion of the wave,

shall be between 40us and 50us. The pulse repetition tate of the electrode shall be

a minimum of 170 pulses per second. Visible or audible corona shall be evident in

the electrode structure when operating at the specified voltage

脈衝波的波頭在20us內將會突漲90%。那些變化是由於輸入脈衝發生器的電壓所引起的。其波動不應超過每刻度峰值電壓的±2%。在運行期間，電極的電容負載從25pf增到50pf.其峰值的增長應在5%以內。在脈衝週期的波形衰減應在40us與50us之間。電極每一的迴圈脈衝必頇大於170次以上。運行的時候，在電極周圍可以明顯的看見有一束光環。

4.2 voltage monitoring equipment 電壓檢測設備

4.2.1 For a.c, d.c. and high frequency sources the electrode to earth potential

difference shall be displayed on a meter either by connection direct to the output

terminals of the high voltage source or by any suitable arrangerment which gives a