一 絕緣材料耐高壓低電流電弧放電試驗機  概述

LDH-20kV型耐電弧試驗儀是根據GB/T 1411-2002《固體絕緣材料耐高壓低電流電弧放電的試驗》（等同IEC  61621-1997）及ASTM D495等標準的要求設計制造的，并符合IEC 149、UL 746A等試驗方法。本儀器由絕緣標準制定單位全國絕緣材料標準化技術委員會監制。

主要用于電機、電器及家電等行業的電工用塑料、樹脂膠、絕緣漆、以及層壓板、覆銅箔板等絕緣材料的耐電弧性能及其分級評定。

二 絕緣材料耐高壓低電流電弧放電試驗機功能特點

1、本機為上下一體結構，下部為操作系統，上部為試驗箱。

2、本產品采用PLC控制，提高抗干擾性能、電壓、電流測量精度。

3、10寸觸控屏操作界面，方便快捷，可通過選擇程序（IEC或ASTM）自動進行試驗，并數顯各試驗過程和結果。

4、計量方便。可選擇任意時段程序進行計量，快捷高效。

5、試驗過程中有步進控制穩壓功能，不受電網電壓波動影響。

6、控制界面上有合閘、零位、升壓、降壓、程序段等監控功能。

7、電壓和電流的實時監控功能。

8、軟件電流保護和電壓保護功能，硬件電流保護和電壓保護功能。

9、在觸控屏界面有電壓和電流的線性校正功能，可以任意修正，方便、快捷、高效。

三 主要技術參數

1 電弧通斷時間誤差：1/8段程序小于?5ms，其余小于1ms

2 調壓器容量：1kVA

3 額定試驗電壓：12.5kV

  最高試驗電壓：15kV

4 試驗電壓精度：?1.0%

5 電流控制精度：?10%  電流測量精度：1.5%

6 電極對試樣壓力：（0.5?0.05）N

7 電極材料：鎢棒

8 電極距離：（6.35?0.1）mm（IEC/ASTM）    9 使用環境溫度：（23?2）℃

10 使用環境濕度：（50?5）%

11 電源：220V?5%  50Hz  10A

12 試驗程序如下：

程序段	電弧電流 mA	電弧通斷時間s		各程序段持續時間s	試驗總時間s
		IEC 61621	ASTM D495
1	10	1/8s通 7/8s斷	1/4s通 7/4s斷	60	60
2	10	1/4s通 3/4s斷	1/4s通 3/4s斷	60	120
3	10	1/4s通 1/4s斷	1/4s通 1/4s斷	60	180
4	10	連續通		60	240
5	20	連續通		60	300
6	30	連續通		60	360
7	40	連續通		60	420

四 結構與組成

本儀器分上下兩層。上層為試驗箱，內置試驗電極系統、高壓輸出插孔、試驗電流表等；用有機玻璃門封閉，便于觀察并確保安全，上有通風孔。

儀器下層為電氣箱。右后部裝有高壓試驗變壓器、保護電阻及高頻抑制電感等，左后前部為調壓器，中部和前部為主電路控制電路及觸控屏控制界面。

五 工作原理簡介

本測試儀是在相距 (6.35?0.1)mm的兩電極上，按試驗方法規定的規律（見試驗程序表），由間歇到連續地施加12.5kV工作電壓和(10～40)mA的電弧電流，直至試樣失效。記下從試驗開始到試樣失效的總時間（s），即為該試樣的耐電弧。其電氣原理圖見圖1。試驗電壓的產生是由220V交流電壓經調壓器T5，再由高壓試驗變壓器T4而產生。試驗電壓12.5kV由調壓器T5調節獲得。試驗電流的大小和通斷時間，由PLC控制接在調壓器T5和高壓試驗變壓器T4之間的四路固體開關和串聯電阻而獲得。

十 標準配置

1電弧測試儀主機       1臺   

2電極系統         1套

3電源電纜         1根   

4接地放電棒        1根    

5試樣架         1套

6電極距離標準塊（6.35mm）    1塊

7角度標準塊        1塊

8使用說明書        1本

9合格證書         1本

10出廠測試報告       1份

11送貨單         1份

七、動力和安全要求

1、 LDH-20KV型耐電弧試驗儀    三孔扁插座220V 10A        1個

2、儀器設備均需要接地且接地電阻≤1Ω，供需雙方商定由供方提供技術要求，由需方自己建造接地系統。

主要適用范圍及功能
   本試驗機是按照GB1411-2002 、IPC650、IEC61621、ASTMD495設計制造，并符合JEC149、UL746A等試驗方法。應用于電機、電器和家用電器等行業的電工用塑料、樹脂膠和絕緣漆等絕緣材料的耐電弧性能評定。主要適用于固體絕緣材料如：塑料、薄膜、樹脂、云母、陶瓷、玻璃、絕緣油、絕緣漆、紙板等介質的耐電弧性能測試；耐電弧試驗機采用計算機控制，試驗過程中可在線觀察試驗曲線；自動存儲試驗條件及試驗結果等數據，并可存取、顯示、打印。

試驗過程描述
   過程    弧電流/mA         通斷時間/秒    持續時間/秒       試驗所經時間/秒
1/8-10       10            1/4s通 7/4s斷        60                      60
1/4-10       10            1/4s通 7/4s斷        60                     120
1/2-10       10            1/4s通 7/4s斷        60                     180
    10       10              導通               60                     240
    20       20              導通               60                     300
    30       30              導通               60                     360
    40       40              導通               60                     420

Overview

The LDH-20kV arc resistance tester is designed and manufactured according to the requirements of GB/T 1411-2002 "Solid Insulation Materials - Test for Resistance to High and Low Voltage Current Arc Discharge" (equivalent to IEC 61621-1997) and ASTM D495 standards, and complies with test methods such as IEC 149 and UL 746A. This instrument is supervised by the National Technical Committee for Standardization of Insulation Materials, the unit responsible for formulating insulation standards.

The arc resistance performance and grading evaluation of electrical plastics, resin adhesives, insulation paints, as well as insulation materials such as laminated boards and copper-clad laminates, mainly used in industries such as motors, electrical appliances, and home appliances.

Two functional features

1. This machine has an integrated upper and lower structure, with the lower part being the operating system and the upper part being the test chamber.

2. This product adopts PLC control to improve anti-interference performance, voltage and current measurement accuracy.

3. 10 inch touch screen operation interface, convenient and fast, can automatically perform tests by selecting programs (IEC or ASTM), and display the test process and results in digital format.

4. Convenient measurement. You can choose any time period program for measurement, which is fast and efficient.

5. During the experiment, there is a step control voltage stabilization function that is not affected by fluctuations in the power grid voltage.

6. The control interface has monitoring functions such as closing, zero position, boost, buck, program segment, etc.

7. Real time monitoring function for voltage and current.

8. Software current protection and voltage protection functions, hardware current protection and voltage protection functions.

9. There is a linear correction function for voltage and current on the touch screen interface, which can be adjusted freely, conveniently, quickly, and efficiently.

Three main technical parameters

1. Error in arc on-off time: 1/8 segment of the program is less than ? 5ms, and the rest is less than 1ms

2. Voltage regulator capacity: 1kVA

3. Rated test voltage: 12.5kV

Maximum test voltage: 15kV

Test voltage accuracy: ? 1.0%

5 Current control accuracy: ? 10% Current measurement accuracy: 1.5%

6 electrode to sample pressure: (0.5 ? 0.05) N

7 electrode material: tungsten rod

8 Electrode distance: (6.35 ? 0.1) mm (IEC/ASTM) 9 Operating ambient temperature: (23 ? 2) ℃

10. Environmental humidity for use: (50 ? 5)%

11 Power supply: 220V ? 5% 50Hz 10A

The 12 test procedures are as follows:

Program segment arc current

MA arc on-off time s duration of each program segment s total test time s

IEC 61621 ASTM D495

1 10 1/8s on 7/8s off 1/4s on 7/4s off 60 60

2 10 1/4s on 3/4s off 1/4s on 3/4s off 60 120

3 10 1/4s on 1/4s off 1/4s on 1/4s off 60 180

4 10 continuous 60 240

5 20 continuous pass 60 300

6 30 continuous 60 360

7 40 continuous pass 60 420

Four Structure and Composition

This instrument is divided into two layers. The upper layer is a test chamber with built-in test electrode system, high-voltage output socket, test ammeter, etc; Sealed with organic glass doors for easy observation and safety, with ventilation holes on top.

The lower layer of the instrument is an electrical box. The right rear is equipped with a high-voltage test transformer, protective resistor, and high-frequency suppression inductor. The left rear front is a voltage regulator, and the middle and front are the main circuit control circuit and touch screen control interface.

Introduction to Five Working Principles

This tester applies a working voltage of 12.5kV and an arc current of (10-40) mA intermittently to continuously on two electrodes separated by (6.35 ? 0.1) mm according to the rules specified in the test method (see test procedure table), until the sample fails. Record the total time (s) from the start of the experiment to the failure of the specimen, which is the arc resistance of the specimen. The electrical schematic diagram is shown in Figure 1. The generation of test voltage is generated by 220V AC voltage passing through regulator T5, and then by high-voltage test transformer T4. The test voltage of 12.5kV is regulated by voltage regulator T5. The magnitude and on/off time of the test current are obtained by controlling the four solid switches and series resistors connected between the voltage regulator T5 and the high-voltage test transformer T4 through PLC.

Ten standard configurations

1 main unit of arc tester

2 electrode systems, 1 set

3 power cables, 1 piece

4 grounding discharge rods, 1 piece

5 sample racks, 1 set

6 electrode distance standard block (6.35mm) 1 block

One 7-angle standard block

8 user manuals 1 book

1 certificate of conformity

10 Factory Test Reports 1 copy

11 delivery note 1 copy

7、Power and safety requirements

1. LDH-20KV arc resistance tester three hole flat socket 220V 10A 1

2. All instruments and equipment need to be grounded with a grounding resistance of ≤ 1 Ω. The supply and demand parties agree that the technical requirements shall be provided by the supplier, and the grounding system shall be constructed by the demand party themselves.

Main application scope and functions

This testing machine is designed and manufactured in accordance with GB1411-2002, IPC650, IEC61621, ASTMD495, and complies with JEC149, UL746A and other testing methods. Evaluation of arc resistance performance of insulation materials such as plastics, resin adhesives, and insulating paints used in the electrical, electrical, and household appliance industries. Mainly suitable for testing the arc resistance performance of solid insulation materials such as plastics, films, resins, mica, ceramics, glass, insulation oil, insulation paint, cardboard and other media; The arc resistance testing machine is computer-controlled, and the test curve can be observed online during the testing process; Automatically store test conditions and test results data, and can access, display, and print them.

Experimental process description

Process arc current/mA on-off time/second duration/second test duration/second

1/8-10 10 1/4s on/7 4s off 60 60

1/4-10 10 1/4s on/7/4s off 60 120

1/2-10 10 1/4s on/7/4s off 60 180

10 10 conductivity 60 240

20 20 conductive 60 300

30 30 conductive 60 360

40 40 conductive 60 420

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