耐电压击穿场强电气强度试验仪电压击穿试验仪

使电介质击穿的电压。电介质在足够强的电场作用下将失去其介电性能成为导体,称为电介质击穿,所对应的电压称为击穿电压。

电介质击穿时的电场强度叫击穿场强。不同电介质在相同温度下,其击穿场强不同。当电容器介质和两极板的距离d一定后,由U1-U2=Ed知,击穿场强决定了击穿电压。击穿场强通常又称为电介质的介电强度。

提高电容器的耐压能力起关键作用的是电介质的介电强度。附表为各种电介质的相对介电常量εr和介电强度。电介质εr击穿场强,×106/（V·m-1）

耐电压击穿场强电气强度试验仪正确选用耐压测试仪

选用耐压仪zui重要的是2个指标，zui大输出电压值及zui大报警电流值一定要大于你所需要的电压值和报警电流值。

一般被试产品标准中规定了施加高压值及报警判定电流值。如果施加的电压越高，报警判定电流越大，那么需要耐压仪升压变压器功率就越大，一般耐压仪升压变压器功率有0.2kVA、0.5kVA、1kVA、2kVA、3kVA等。zui高电压可以到几万伏。zui大报警电流500mA-1000mA等。所以在选择耐压仪时一定要注意这2个指标。

功率选太大就会造成浪费，选的太小耐压试验不能正确判断合格与否。

根据IEC414或（GB6738-86）中规定选择耐压仪的功率方法，我们认为是比较科学的。"首先将耐压仪的输出电压调到规定值的50%，然后接上被试品，当观测到的电压降小于该电压值的10%时，则认为耐压仪的功率是足够的。"

也就是如果某一产品的耐压试验的电压值为3000伏，先把耐压仪的输出电压调到1500伏后接上被试品，如果此时耐压仪输出电压下降的值不大于150伏，那么耐压仪的功率是足够的。被试品的带电部分与外壳之间存在分布电容。电容存在一个CX容抗，当一个交流电压施加在这CX电容两端就会引成一个电流。

这个电流的大小与CX电容的容量成正比与施加的电压值成正比，当这个电流大到或超过耐压仪zui大输出电流时，这台耐压仪就不能正确判别试验合格与否。

电缆耐电压的试验方法

1、应采用成品电线的试样按28.2—28.9所述的方法做试验。应试验绝缘线、绝缘扁电缆或护套电缆的绝缘线芯。在护套电缆的情况下，应取出绝缘线芯并独立于护套电缆做试验。

2、对于每个需进行评价的电线样品，应取6个绝缘线或护套电缆的绝缘线芯试样做试验。每个试样应长24in（610mm）。其中3个试样在未老化状态下做试验，另3个试样应经过烘箱处理后做试验。

3、三个用于烘箱处理的直线状试样应放进烘箱中进行处理，处理时间和烘箱温度应与本标准第14节：绝缘和护套末老化和烘箱老化后物理性能所述和试验*。

4、烘箱处理以后，应将这3个试样放在室温的静止空气中泠却16-96小时然后做试验。泠却期结束以后，同时采用末老化和烘箱老化的试样做试验。采用金属箔包每个试样中央的12in（305mm）的部分。

5、除了扁电线外，应将每个试样的金属箔绕包部分绕在金属试棒上6个完整的紧密相连的圈。试棒直径应为试样外径的2倍或是0.19in（5mm）取二者中较大者，每个由此形成地螺旋线的端头应松松地缠绕在一起或是采用粘接带固定在一起以防止退绕。扁电线试样应围绕直径等于短径2倍的试棒弯曲成U形并与试棒接触至少180°。

6、介电试验机应能提供50或是60HZ连续可变从零至电线试样额定电压5倍的输出电压。电路中接上试样后，输出电压的峰值因数（峰值除以均方根值）应等于纯正波上半部输出范围峰值因数的95-105%。应使用电压表连续临测输出电压，该电压表的响应时间在规定的升压速度下不会造成大于1%满盘的滞后的误差。其总电压精度不会造成大于5%的误差。试验机变压器可输出的zui大电流应保证可进行试样的击穿试验而示发持加载电流引起断路器跳闸现象。

7、将介电试验机的一根试验引接到作为一个电极的试样的导体上，并另一根试验引接到作为另一个电极的金属试棒上，电压应从零开始上升至28.1

规定的试验电压。升压速度不得超过500V/s如果达到水平无击穿，电压应保持在该水平60秒。

8、试验电压在规定电压水平上维持60秒后，应以不超过500V/S的速度继续升压至击穿。应分别记录末老化试样和烘箱老化试样的介质击穿电压并分别求出末老化试样和烘箱的老化试样的介质击穿电压的平均值。

9、末老化试样和烘箱老化试样应满足下列要求：

a）末老化试样和烘箱老化试样应耐受28.1规定的试验电压60秒不击穿；

b） 烘箱梅化试样的介质击穿电压的平均值不得小于末老化试样平均值的50%。

配置及其技术参数

1 试验变压器

1.1 输出电压： AC 0-10000V，DC 0-10000V；

1.2 输入电压：220v

1.3 额定容量下，长期连续运行；

1.4 zui大输出电压下，PD≤1pC；

1.5 噪声≤58dB（1m位置测量）。

2 调压器

2.1 输入电压：220V；

2.2 额定容量：2kVA（如果有补偿，可以小于15kVA，但不小于10kVA）；

2.3额定容量下，长期连续运行；

2.4噪声≤58dB（1m位置测量）;

2.5 电动调压。

3 高压分压器

3.1 高压臂电容：1nF；

3.2 分压比：700（可讨论，结合测量控制系统）；

3.3 额定容量下，长期连续运行；

3.4 zui大输出电压下，PD≤1pC；

3.5 测量精度：1%。

4 计算机控制

4.1 蓝牙连接；

4.2 安全保护；

技术指标：

输入电压： 交流 220 V 输出电压： 交流 0--100 KV ;/直流 0—100 KV

电器容量： 10KVA 高压分级： 0-100KV 升压速率：0.01-5.0kv

（备注：满足标准要求并可以根据用户需求设定不同的升压速率）

06、试验方式： 交流试验/ 直流试验：1、匀速升压 2、梯度升压 3、耐压试验

试验介质：空气，试验油 安装灵敏度较高的过电流保护装置保证试样击穿时在0.05S内切断电源。 仪器配备*故障报警系统 避免用户操作故障仪器发生危险。（上位机报警和下位机报警）

组成：

1、升压部件：由调压器和高压变压器组成0～50KV的升压部分。

2、动部件：由步进电机均匀调节调压器使加给高压变压器的电压变化。

3、检测部件：由集成电路组成的测量电路。通过信号线把检测的模拟信号和开关信号传给计算机。

4、计算机软件：通过智能电路把由检测设备采集的测控信号传给计算机。计算机根据采集的信息控制设备运行并处理试验结果。

5、试验电极：根据国家标准(1408.1-2006)随设备提供三个电极，具体规格为：Ф25mm×25mm两个；Ф75mm×25mm一个。（订做除外）

Breakdown voltage breakdown voltage electric strength test instrument pressure resistance tester

The dielectric breakdown voltage. Dielectric under the action of electric field in a strong enough will lose its dielectric properties become the conductor, called the dielectric breakdown, the corresponding voltage is called the breakdown voltage.

When the dielectric breakdown electric field intensity is called breakdown voltage. Different dielectric under the same temperature, the breakdown voltage is different. Capacitor medium and the plates, after a certain distance d by U1 - U2 = Ed, breakdown voltage determines the breakdown voltage. Dielectric breakdown voltage is often called the dielectric.

Increase the ability of condenser pressure is dielectric plays the key role of dielectric strength. Schedule for all kinds of dielectric epsilon r relative dielectric constants and dielectric strength. Dielectric breakdown field strength epsilon r, x 106 / (v. m - 1)







Voltage breakdown voltage electric resistance strength tester correctly choose hipot tester



Selection of pressure gauge is the most important two indicators, alarm of the maximum output voltage and current value must be greater than you need voltage values and alarm current value.





General subjects specified in the product standard under pressure values and alarm judge current value. If the applied voltage is high, report to the police to determine the current, the greater the pressure meter is necessary step-up transformer the greater the power, the general pressure gauge step-up transformer power 0.2 kVA, 0.5 kVA, 1 kVA, 2 kVA, 3 kVA, etc. The highest voltage can be for tens of thousands of volts. The largest alarm current 500 ma - 1000 ma, etc. So when choosing pressure gauge must pay attention to these two indicators.



The power to choose too much can cause waste, correct judgment is too small pressure test is qualified or not.

According to IEC414 or (GB6738-86) specified in the selection pressure instrument power method, we think that is more scientific. "First of all the pressure gauge, and 50% of the output voltage is transferred to the specified value and then connected to the participants to taste, when the observed voltage drop less than 10% of the voltage value, think the power of pressure gauge is enough."



, that is, if a product of the pressure test voltage is 3000 v, the pressure gauge first after the output voltage to 1500 volts of connected to the participants to taste, if the pressure gauge output voltage drop value is not greater than 150 v, so the power of pressure gauge is enough. The sample (s) is distributed capacitance between shell and the live part. Capacitor CX capacitive reactance, there is a when a voltage applied on both ends of the CX capacitance will lead into an electric current.





The size of the current is proportional to the CX capacitance capacity is proportional to the applied voltage, when the current is too big to or exceed the pressure meter maximum output current, the pressure gauge can't correct discrimination test or not.





Cable withstand voltage test method



1, the sample of the finished wire should be adopted in the way described in 28.2-28.9 do an experiment. Should be insulated wire, flat cable insulation or sheath cable insulation wire core. Under the condition of the sheathed cable, should remove insulation wire core and is independent of the sheathed cable to do an experiment.



2, for each of the need to evaluate wire samples, should take six insulation or sheath cable insulation wire core sample test. 24 in each sample should be long (610 mm). Three samples without aging experiment condition, the other three sample should do after dealing with the oven test.



3, three straight line shape sample should be used to deal with the oven into oven for processing, processing time and drying oven temperature should be with section 14 of this standard: at the end of the insulation and sheath after the aging and oven ageing properties described and experiment are consistent.



4, oven after processing, should put the three samples at room temperature in still air ling but 16-96 hours and then do an experiment. At the end of the ling but after the period, at the same time, the aging and oven ageing test specimens. Using metal foil bag each 12 in the middle of the sample (305 mm).



5, in addition to the flat wire, each sample should be around the metal foil winding and part of the test bar on six full circle are closely linked. Sample test bar diameter should be 2 times of overall diameter or 0.19 (5 mm) in both in highly actie, each resulting in the end of the helix YingSongSong ground together or use adhesive tape of fixed together to prevent unwinding. Flat wire samples should be 2 times around the diameter is equal to the short diameter of test bar bent into U and contact with the test bar at least 180 °.



Six, dielectric tester should be able to provide 50 or 60 hz continuous variable from zero to wire the sample 5 times rated voltage output voltage. Circuit connected to the sample, after the peak factor of the output voltage divided by the root mean square (peak value) should be equal to the upper pure wave output range 95-105% of the peak factor. Voltmeter should be used in the continuous measurement of the output voltage, the response time of the voltmeter will not result in greater than 1% under the specified speed booster plateful of lag error. The total voltage accuracy will not result in more than 5% of error. Testing machine output the maximum current of transformer should be guarantee for the breakdown of the sample test and send the load current circuit breaker tripping caused phenomenon.



7, will be a test of dielectric tester received as an electrode on the conductor of the specimen, and the other test lead received as another electrode metal test bar, voltage should be starting from scratch up to 28.1

The prescribed test voltage. Booster speed should not exceed 500 v/s if level and no breakdown, voltage should be kept in the level of 60 seconds.





8, test voltage to maintain the prescribed voltage level after 60 seconds, should be no more than 500 v/S continue to step up to the speed of the breakdown. Should record the aging samples and oven ageing samples at the end of the dielectric breakdown voltage and calculated respectively at the end of the aging of the specimen and oven ageing dielectric breakdown voltage of the average.



At the end of September and aging samples and oven ageing samples shall meet the following requirements:

A) 28.1 aging samples and oven ageing samples should be at the end of the tolerance specified test voltage breakdown in 60 seconds;

B) oven of mei sample average dielectric breakdown voltage shall not be less than 50% of aging at the end of the sample average.





Withstand voltage breakdown voltage electric strength test device configuration and technical parameters

1 testing transformer

Output voltage: 1.1 AC 0-10000 - v, DC 0-10000 - v;

1.2 the input voltage: 220 v

1.3 under the rated capacity, long-term continuous operation;

1.4 under the maximum output voltage, PD 1 PC or less;

1.5 noise 58 db (1 m position measurement) or less.

2 voltage regulator

2.1 the input voltage: 220 v;

2.2 nominal capacity: 2 kva, if any compensation, can be less than 15 kva, but not less than 10 kva);

2.3 under the rated capacity, long-term continuous operation;

2.4 noise acuities were 58 db (1 m position measurement);

2.5 the electric voltage regulation.

3 high voltage divider

3.1 high pressure arm capacitance: 1 nf;

3.2 compression ratio: 700 (can be discussed, combined with measuring control system);

3.3 under the rated capacity, long-term continuous operation;

3.4 under the maximum output voltage, PD 1 PC or less;

3.5 accuracy: 1%.

The computer control

4.1 bluetooth connection;

4.2 safety protection;



Voltage breakdown voltage electric resistance strength tester technical indicators:

The input voltage: ac 220 V output voltage: communication 0-100 KV; / dc 0-100 KV

Electric capacity: 10 kva high-pressure sizing: 0-100 kv step-up rate: 0.01 to 5.0 kv

(note: meet the standard requirements and can be set according to user requirements of different rate of pressure rise)

06, test method: ac/dc test: 1, 2, gradient booster 3 uniform booster, withstand voltage test

Test medium: air, oil test installation high sensitivity of over current protection device to ensure the sample breakdown within 0.05 S when cut off power supply. The instrument is equipped with advanced fault alarm system Avoid user operation fault instrument. Alarm (the upper machine and lower machine alarm)





Withstand voltage breakdown voltage of electric strength tester:

1, booster parts: consists of a voltage regulator and the high voltage transformer 0 ~ 50 kv booster section.

2, moving parts: uniform regulation voltage regulator by stepper motor to high voltage transformer voltage change.

3, test parts: measurement circuit composed of integrated circuit. Through the analog signal and the detection line switch signal to the computer.

4, computer software, by testing equipment acquisition through inligent circuit of measurement and control signals to the computer. Computer control equipment operation according to the collected information and process the test results.

5, test electrode: according to the national standard (1408.1-2006) with the equipment to provide three electrodes, specifications are: Ф two 25 mm x 25 mm; Ф a 75 mm x 25 mm. Except (build)