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20KV高电压小电流放电试验仪耐电弧试验机

一、20KV高电压小电流放电试验仪耐电弧试验机  依据的标准

LDH-15KV型耐电弧测试仪是根据GB/T 1411-2002《固体绝缘材料耐高压低电流电弧放电的试验》（等同IEC  61621-1997）及ASTM D495等标准的要求设计制造的，并符合UL 746A等试验方法。

二、高电压小电流放电试验仪耐电弧试验机功能特点

1、本机为上下一体结构，下部为操作系统，上部为试验箱。

2、本产品采用PLC和触摸屏控制，自动化程度高，能自动升降压和稳压，自动切换执行程序，自动描绘运行曲线，测量实时电压和电流，计时试验时间。

3、电极系统仿德国进口电极，角度、间隙校准方便、快捷、高效，重复性好，精度高。

4、数据测量采用高精密、高速VF转换芯片，转换速度快，测量精度高，抗干扰能力强。

5、本机备有排气孔，能及时排除放电产生的分解物，保证操作人员的健康。

三、适用范围

适用于电机、电器及家电等行业的电工用塑胶、树脂胶、绝缘漆、以及层压板、覆铜箔板和制件等绝缘材料的耐电弧性能及其分级评定。

四、主要技术参数

1、 电弧通断时间误差：1/8s通7/8s断时?5ms，其余程序段优于?1ms

2、 调压器容量：1kVA

3、 额定试验电压：12.5kV

4、gao试验电压：15.0kV

5、试验电压精度：＜1.0%

6、电流测量精度：＜1.0%

7、电极对试样压力：（0.5?0.05）N

8、电极材料：钨棒

9、电极距离：（6.35?0.1）mm

10、使用环境温度：（23?2）℃

11、使用环境湿度：（50?5）%

12、电源：220V?5%  50Hz  10A

13、试验程序如下：

 

Electrodes and electrode devices

4.2.1 Electrode

The electrode is made of tungsten rod with a diameter of 2.4mm ? 0.05mm and no cracks, dents or rough defects. The length of the active electrode should be at least 20mm. It is recommended to fix this activity electrode on the handle so that the sharpened electrode can be accurately positioned. The electrode should be ground and polished to form a flat elliptical surface with an angle of 30 ?? 1 ? with the axis. Figure 2 shows an example of an electrode fixed on a suitable handle.

Note 1: It has been found that tungsten welding rods are suitable for this type of electrode.

Note 2: During the sharpening process, using a steel clamping device to hold the electrode helps ensure that the pointed electrode is machined into the required geometric shape.

4.2.2 Electrode device

This device provides a method of clamping electrodes and samples, allowing the arc to be applied to the upper surface of the sample at the correct angle. The device should be constructed in such a way that the upper surface of each specimen is at the same height during each test. Each electrode should be adjusted so that it rests unconstrained on the specimen with a force of 0.5N ? 0.05N. The sample should not be ventilated, and only when smoke or gas is released from the sample during the testing process, are these combustion products allowed to be discharged.

A clear field of view for observing the arc should be provided from a plane slightly above the specimen.

Note: The requirements for airflow are currently under consideration.

4.2.3 Cleaning and sharpening electrodes

4.2.3.1 Cleaning electrodes

a) After each experiment, the electrode should be cleaned with a lint free laboratory tissue dipped in solvents such as acetone or ethanol, then rinsed with deionized water, and finally wiped dry with a clean, dry lint free tissue.

 

configuration

Number, Name, Quantity, Remarks

One 01 arc resistance tester

One set of 02 electrode system

03 electrode support set

One set of 04 power cables

One 05 grounding discharge rod

One 06 milliampere meter

A set of 07 computer measurement and control software

One sample rack for 08

09 electrode distance standard block 2 pieces

2 standard blocks at 10 angles

11 ceramic pieces, 2 pieces

12 inkjet printers, 1 brand

13 computers, 1 brand

definition

The following definitions apply to this standard.

three point one

Note 2: For certain materials, the trend towards failure increases over a considerable period of time before all arcs between the electrodes are extinguished, and failure only occurs when all arcs have been extinguished.

three point two

Arc resistance

The total time from the start of the experiment until the failure of the specimen, in seconds.

Safety protection measures: (1) Overpressure protection

(2) Overcurrent protection

(3) Short circuit protection

(4) Security door opening protection

(5) Software misoperation protection

device

4.1 Test Circuit

The main components of the electrical circuit of the experimental equipment are shown in Figure 1.

Note: The stray capacitance of the secondary circuit wiring should be less than 40pF. Large stray capacitance may interfere with the shape of the arc and affect the test results.

4.1.1 Transformer, TV

The rated secondary voltage (open circuit) of the transformer is 15kV, the rated secondary current (short circuit) is 60mA, and the line frequency is 48Hz~62Hz.

4.1.2 Variable ratio autotransformer, TC

The rated capacity is 1kVA and matches the line voltage.

Note: It is recommended to maintain a variation of ? 2% in the primary voltage power supply.

4.1.3 Voltage meter, VL

The AC voltmeter has an accuracy of ? 0.5% and can read% of the power supply voltage.

4.1.6 Suppressing resistors, R3

The rated resistance is 15k Ω? 1.5k Ω and at least 24W. This resistor, together with the inductor (see 4.1.7), is used to suppress parasitic high frequencies in arc circuits.

4.1.7 Hollow core inductors, X3，1.2H～1.5H

Note: This type of inductor composed of a single coil is not practical. A satisfactory inductor is composed of eight 3000 to 5000 turns coils wound in series around an insulated non-metallic core with a diameter of approximately 12.7mm and an inner length of 15.9mm.

4.1.8 Circuit breaker, B

Interruptors driven by motors or operated by electronic instruments are used to cut off and connect the primary circuit according to the predetermined program in Table 1, in order to obtain the cycles required for the three lower stages of the experiment. The accuracy of the chopper is ? 0.008s.

4.1.9 Timer, TT

Stopwatch or electric timer, accurate to ? 1s.

4.1.10 Contactor, CS

When the ventilation protective cover on the electrode device is lowered to the set position, the ventilation protective cover triggers a normally open (NO) micro switch, which in turn activates the contactor CS and connects the transformer TV to the circuit, causing high voltage HV to be applied to the electrode. When the ventilation protective cover is raised, the transformer is disconnected and the operator is protected.

电极和电极装置4.2.1电极电极由直径2.4mm?0.05mm无裂纹、凹痕或粗糙疵点的钨棒制成。活动电极长至少20mm。推荐将这个活动电极固定于把柄上，使得在削尖后的电极能准确定位。该电极应经研磨抛光，以形成与轴线夹角为30??1?的平椭圆面。图2展示出固定于合适把柄上的电极的一个实例。注1：已发现钨焊条是适用于这种电极的。注2：在削尖过程中，采用钢制夹紧装置夹持电极，有助于保证将尖头电极加工成所要求的几何形状。4.2.2电极装置该装置提供了一种夹持电极和试样的方法，使得电弧按正确的角度施加于试样的上部表面。该装置应这样构成，使得每一个试样上部表面在每一次试验时都处在同一高度上。应调节每一电极，使得它以0.5N?0.05N的力无约束地静置于试样上。不应对试样进行抽风，只有当试验过程中试样释放出烟雾或气体时，才允许把这些燃烧产物排放掉。从略高于试样的平面位置，应提供观察电弧的清晰视域。注：对气流的要求，正在考虑之中。4.2.3清洗和削尖电极4.2.3.1清洗电极a）每一次试验后，应该用不起毛的实验室用的纸巾蘸以丙酮或乙醇之类溶剂清洗电极，再用去离子水擦洗电极，然后用干净的、干的不起毛的纸巾将其擦干。

 

配置

序号	名称	数量	备注
01	耐电弧测试仪	一台
02	电极系统	一套
03	电极支座	一套
04	电源电缆	一套
05	接地放电棒	一支
06	电流毫安表	一台
07	电脑测控软件	一套
08	试样架	一支
09	电极距离标准块	2块
10	角度标准块	2块
11	陶瓷片	2片
12	喷墨打印机	1台	品牌
13	计算机	1台	品牌

定义下列定义适用于本标准。3.1注2：对某些材料，在电极间电弧全部熄灭前，在相当长的时间范围内，朝失效发展的趋势增加，仅当所有电弧已熄灭才发生失效。3.2耐电弧 arc resistance从试验开始直至试样失效的总时间，秒。

安全防护措施：（1）超压保护
                              （2）过流保护 
                              （3）短路保护
                              （4）安全门开启保护
                              （5）软件误操作保护

设备4.1试验回路试验设备电气回路的主要部件如图1所示。注：次级回路接线杂散电容应小于40pF。大的杂散电容可能会干扰电弧的形状并影响试验结果。4.1.1变压器，TV该变压器的额定次级电压（开路）为15kV，额定次级电流（短路）为60mA，线路频率为48Hz~62Hz。4.1.2可变比自耦变压器，TC额定容量为1kVA且与线路电压匹配。注：推荐初级电压电源变化保持?2%。4.1.3电压表，VLAC电压表，其准确度为?0.5%，能读出电源电压的%。4.1.6抑制电阻器，R3额定电阻为15kΩ?1.5kΩ并至少24W。该电阻器与电感（见4.1.7）一起用作抑制电弧电路中的寄生高频。4.1.7空芯电感器，X3，1.2H～1.5H注：用单个线圈构成的这种电感器是不实用的，令人满意的电感器是将导线绕在直径约12.7mm和内长15.9mm的绝缘非金属芯子上的8个3000匝~5000匝的线圈串联而成。4.1.8断电器，B由电机驱动或电子仪器操作的断续器是用作按表1的预定程序进行切断和接通初级回路，以便获得该试验的三个较低阶段所需要的周期。断续器的准确度为?0.008s。4.1.9计时器，TT秒表或电动计时器，准确至?1s。4.1.10接触器，CS当罩在电极装置上的通风防护罩降至设定位置时，该通风防护罩触动常开（NO）微型开关，而微型开关又使接触器CS动作并将变压器TV与回路接通，使得高压HV施加于电极上。当通风防护罩升起时，变压器断开，操作者得到保护。

GB/T 1411-2002 干固体绝缘材料 耐高电压、小电流电弧放电的试验
ASTM D495-1999(2004) Standard Test Method for High-Voltage,Low-Current,Dry Arc Resistance of Solid Electrical Insulation
     IEC 61621-1997 Dry,Solid Insulating Materials. Resistance Test to High-Voltage,Low-Current Arc Discharges Materiaux Isolants Solides Secs. Essai De Resistance Aux Decharges A L′Arc Haute Tension,Faible Courant First Edition
本试验仪器符合GB/T 1411-2002《干固体绝缘材料 耐高电压、小电流电弧放电的试验 》符合IEC61621、ASTMD495及JEC149、UL746A试验方法。本试验机主要适用于固体绝缘材料如：塑料、薄膜、树脂、云母、陶瓷、玻璃、绝缘油、绝缘漆、纸板等介质的耐电弧性能测试；耐电弧试验机采用计算机控制，试验过程中可在线观察试验曲线；自动存储试验条件及试验结果等数据，并可存取、显示、打印。