产品

北京10KV耐电压击穿试验仪  整机组成：

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）

结构原理及性能特点：

        本设备主要由：升压系统(高压变压器)、测量系统、A/D转换器、放电系统、电极、油箱、电极定位架、计算机数据处理系统、软件等组成

计算机--A/D转换器--测量控制系统--调压装置--升压变压器--试样

高压变压器主要产生试样所需的直流电压，

调压器用于调节升压变压器输入端电压以产生高压所需的输入电压，

电压测量主要是从高压变压器测量端测量，高压变压器测量端和高压端是线性的，

放电系统在试验做完以后自动放电，以免产生放电对人身的危害；

北京10KV耐电压击穿试验仪  固体电介质击穿

导致击穿的最低临界电压称为击穿电压.均匀电场中,击穿电压与介质厚度之比称为击穿电场强度（简称击穿场强,又称介电强度）.它反映固体电介质自身的耐电强度.不均匀电场中,击穿电压与击穿处介质厚度之比称为平均击穿场强,它低于均匀电场中固体介质的介电强度.固体介质击穿后,由于有巨大电流通过,介质中会出现熔化或烧焦的通道,或出现裂纹.脆性介质击穿时,常发生材料的碎裂,可据此破碎非金属矿石.

固体电介质击穿有3种形式:电击穿,热击穿和电化学击穿.

电击穿是因电场使电介质中积聚起足够数量和能量的带电质点而导致电介质失去绝缘性能.热击穿是因在电场作用下,电介质内部热量积累,温度过高而导致失去绝缘能力.电化学击穿是在电场,温度等因素作用下,电介质发生缓慢的化学变化,性能逐渐劣化,最终丧失绝缘能力.固体电介质的化学变化通常使其电导增加,这会使介质的温度上升,因而电化学击穿的最终形式是热击穿.温度和电压作用时间对电击穿的影响小,对热击穿和电化学击穿的影响大;电场局部不均匀性对热击穿的影响小,对其他两种影响大.

常规型号：

01、BDJC-10KV耐电压击穿试验仪

02、BDJC-30KV耐电压击穿试验仪

03、BDJC-50KV耐电压击穿试验仪

04、BDJC-100KV耐电压击穿试验仪

05、BDJC-150KV耐电压击穿试验仪

介电强度是一种材料作为绝缘体时的电强度的量度.它定义为试样被击穿时,单位厚度承受的最大电压,表示为伏特每单位厚度.物质的介电强度越大,它作为绝缘体的质量越好.

介电强度，是材料抗高电压而不产生介电击穿能力的量度，将试样放置在电极之间，并通过一系列的步骤升高所施加的电压直到发生介电击穿，以次测量介电强度。尽管所得的结果是以kv/mm为单位的，但并不表明与试样的厚度无关。因此，只有在试样厚度相同的条件下得到各种材料的数据才有可比性。

电极和试样

金属电极应始终保持光滑、清洁和无缺陷。

注1：当对薄试样进行试验时，电极的维护格外重要。为了在击穿时尽量减小电极损伤，优先采用不锈钢电极。

接到电极上的导线即不应使得电极倾斜或其他移动或使得试样上压力变化，也不应使得试样周围的电场分布受到显著影响。

注2：试验非常薄的薄膜（例如：<μm厚)时,这些材料的产品标准应规定所用的电极、操作的具体程序和试样的制备方法。

适用材料：

主要适用于固体绝缘材料如：电线套管、树脂和胶、浸渍纤维制品、云母及其制品、塑料薄膜、陶瓷、玻璃、绝缘漆、硫化橡胶、电缆纸、绝缘漆漆膜、硬质橡胶、纸板等绝缘介质在空气或液体介质中，测量工频（48~62Hz）或对应直流电压下击穿强度和耐电压时间。适用于连续均匀升压或逐级升压的方式，对试样施加交流/或直流，电压直至击穿，测量击穿电压值，计算试样的击穿强度；用迅速升压的方法，将电压升到规定值，保持一定的时间试样不击穿，定此时规定值为试样的耐电压值。软件系统操作方便，性能稳定，安全可靠。

闪络flashover

试样和电极周围的气体或液体媒质承受电应力作用时，其绝缘性能损失，由此引起的试验回路电流促使相应的回路断路器动作。

注：碳化通道的出现或穿透试样的击穿可用于区分试验是击穿还是闪络。

主要配置:

  1、主机一台

  2、试验电极：

  （1）试验用薄膜电极 ￠25mm两个，￠75mm一个

  （2）漆包线电极两个

  （3）管用电极两个

  3、试验用油盒两只

  4、放电棒一只

  5、试验用软件一套

  6、计算机一套

  7、打印机一台

试验方式：

1、绝缘试样空气中击穿、耐压试验或阶梯试验；

2、绝缘试样浸油中击穿、耐压试验或阶梯试验；

注：根据用户要求，可定制其他试验方式。

击穿场强

在发生击穿时的电场强度依赖于电介质（绝缘体）的各自的几何形状和与该电场被施加在电极上，以及在其中所述增加速率电场被施加。由于电介质材料通常含有微小的缺陷，实际的电介质强度将是理想的无缺陷材料的固有电介质强度的一部分。与相同材料的较厚的样品相比，介电膜倾向于表现出更高的介电强度。例如，几百纳米至几微米厚的二氧化硅膜的介电强度大约为0.5GV / m。然而非常薄的层（下面，比方说，100纳米）成为由于部分导电电子隧穿。在需要最大的实际介电强度的地方，例如高压电容器和脉冲变压器，使用多层薄介电膜。由于气体的绝缘强度取决于电极的形状和结构而变化，通常以氮气的介电强度的一部分来测量

试验软件：

1、本仪器在试验过程中可对升压击穿过程绘制实时曲线，每次试验的升压曲线都由不同颜色构成，试验结束后可叠加对比材料的试验数据重复性。

2、可以随时调取当前及历史试验数据进行查看，编辑及修改参数。

3、试验过程中可以随时修改试验条件及存储路径及自动存储试验结果。

4、试验过程中，可随时通过软件决定本次试验是否有效，方便筛选试验结果。

5、可设置操作口令，做到专机专人操作，避免无关人员误操作。

结构原理及性能特点：

1、主要由升压系统、测量系统、A/D转换器、放电系统、电极、油箱、电极定位架、计算机数据处理系统、软件等组成；

2、计算机---A/D转换器---测量控制系统---调压装置---升压变压器---试样；

3、高压变压器主要产生试样所需的直流电压；

4、调压器用于调节升压变压器输入端电压以产生高压所需的输入电压；

5、电压测量主要是从高压变压器测量端测量，高压变压器测量端和高压端是线性的；

6、放电系统在试验做完以后放电，以免产生放电对人身的危害；（当试验结束后，机器部件仍可能存在残留的高电压，此残留电压足以对人产生致命的伤害，配备此棒，完好的解决此安全隐患）。

产品特点

1、运行于WIN  XP/WIN7/WIN8系统下的独立安装软件，界面友好，操作简单

2、实验显示曲线，数据自动储存，自动查找

3、多种用途可以进行交、直流试验试验准确、可靠、安全

4、计算机控制试验过程，自动判断停止，自动复位

5、超压、过流、短路、漏电、误操作等多种保护

Overall composition:

1. Boosting component: The boosting part of 0-50KV is composed of a voltage regulator and a high-voltage transformer.

2. Moving parts: The voltage regulator is uniformly adjusted by a stepper motor to change the voltage applied to the high-voltage transformer.

3. Detection component: a measurement circuit composed of integrated circuits. Send the detected analog signals and switch signals to the computer through signal lines.

4. Computer software: transmits the measurement and control signals collected by the detection equipment to the computer through intelligent circuits. The computer controls the operation of the equipment based on the collected information and processes the test results.

5. Test electrodes: According to the national standard (1408.1-2006), three electrodes are provided with the equipment, with specific specifications as follows:Ф25mm?Two 25mm;Ф75mm?25mm each. (Excluding customization)

Structural principles and performance characteristics:

This equipment mainly consists of: step-up system (high-voltage transformer), measurement system, A/D converter, discharge system, electrodes, oil tank, electrode positioning frame, computer data processing system, software, etc

Computer - A/D converter - Measurement control system - Voltage regulation device - Booster transformer - Sample

The high-voltage transformer mainly generates the DC voltage required for the sample,

The voltage regulator is used to regulate the input voltage of the step-up transformer to generate the input voltage required for high voltage,

Voltage measurement is mainly measured from the measurement end of the high-voltage transformer, and the measurement end and high-voltage end of the high-voltage transformer are linear,

The discharge system automatically discharges after the experiment is completed to avoid the harm of discharge to human health;

Solid dielectric breakdown

The minimum critical voltage that causes breakdown is called breakdown voltage. In a uniform electric field, the ratio of breakdown voltage to dielectric thickness is called breakdown electric field strength (referred to as breakdown electric field strength, also known as dielectric strength). It reflects the dielectric strength of the solid dielectric itself. In an uneven electric field, the ratio of breakdown voltage to dielectric thickness at the breakdown point is called average breakdown electric field strength, which is lower than the dielectric strength of the solid dielectric in a uniform electric field. After the solid dielectric breakdown, Due to the passage of a huge current, channels for melting or burning may appear in the medium, or cracks may appear. When brittle media breakdown occurs, material fragmentation often occurs, which can be used to break non-metallic ores

There are three forms of breakdown in solid dielectrics: electrical breakdown, thermal breakdown, and electrochemical breakdown

Electrical breakdown is caused by the accumulation of a sufficient number and energy of charged particles in the dielectric due to an electric field, resulting in the loss of insulation performance of the dielectric. Thermal breakdown is caused by the accumulation of heat inside the dielectric under the action of an electric field, resulting in the loss of insulation ability due to high temperature. Electrochemical breakdown is caused by the slow chemical change of the dielectric under the action of factors such as electric field and temperature, and the performance gradually deteriorates, The ultimate loss of insulation ability. Chemical changes in solid dielectrics usually increase their conductivity, which causes the temperature of the medium to rise. Therefore, the final form of electrochemical breakdown is thermal breakdown. Temperature and voltage action time have a small impact on electrical breakdown, but a large impact on thermal breakdown and electrochemical breakdown; The local non-uniformity of the electric field has little effect on thermal breakdown, but has a greater impact on the other two

Conventional models:

01. BDJC-10KV withstand voltage breakdown tester

02. BDJC-30KV withstand voltage breakdown tester

03. BDJC-50KV withstand voltage breakdown tester

04. BDJC-100KV withstand voltage breakdown tester

05. BDJC-150KV withstand voltage breakdown tester

Dielectric strength is a measure of the electrical strength of a material as an insulator It is defined as the maximum voltage per unit thickness that a sample can withstand when it is broken down, expressed in volts per unit thickness The higher the dielectric strength of a substance, the better its quality as an insulator

Dielectric strength is a measure of a material's ability to withstand high voltage without generating dielectric breakdown. The sample is placed between electrodes and the applied voltage is increased through a series of steps until dielectric breakdown occurs, in order to measure the dielectric strength. Although the results obtained are in kV/mm units, it does not indicate that they are independent of the thickness of the sample. Therefore, comparability of data for various materials can only be obtained under the condition of the same sample thickness.

Electrodes and specimens

Metal electrodes should always be smooth, clean, and defect free.

Note 1: When testing thin specimens, electrode maintenance is particularly important. In order to minimize electrode damage during breakdown, stainless steel electrodes are preferred.

The wire connected to the electrode should not tilt or move the electrode or cause pressure changes on the sample, nor should it significantly affect the distribution of the electric field around the sample.

Note 2: Test very thin films (e.g.:<μWhen the thickness is m, the product standards for these materials should specify the electrodes used, the specific procedures for operation, and the preparation method for the samples.

Applicable materials:

Mainly suitable for measuring the breakdown strength and withstand voltage time of solid insulation materials such as wire sleeves, resins and adhesives, impregnated fiber products, mica and its products, plastic films, ceramics, glass, insulation paint, vulcanized rubber, cable paper, insulation paint film, hard rubber, cardboard, etc. in air or liquid media at power frequency (48-62Hz) or corresponding DC voltage. Suitable for continuous and uniform boosting or stepwise boosting, apply AC/or DC voltage to the sample until breakdown, measure the breakdown voltage value, and calculate the breakdown strength of the sample; Using a rapid voltage increase method, raise the voltage to the specified value and maintain the sample without breakdown for a certain period of time. The specified value at this time is the withstand voltage value of the sample. The software system is easy to operate, has stable performance, and is safe and reliable.

Flashover

When the gas or liquid medium around the sample and electrode is subjected to electrical stress, its insulation performance is lost, and the resulting test circuit current drives the corresponding circuit breaker to operate.

Note: The appearance of carbonization channels or breakdown through the specimen can be used to distinguish whether the test is breakdown or flashover.

Main configuration:

1. One host

2. Test electrode:

(1) Two thin film electrodes with a diameter of 25mm and one with a diameter of 75mm are used for the experiment

(2) Two enameled wire electrodes

(3) Two utility electrodes

3. Two test oil boxes

4. One discharge rod

5. A set of experimental software

6. A set of computers

7. One printer

Test method:

1. Air breakdown, withstand voltage test or step test for insulation samples;

2. Electrical breakdown, withstand voltage test or step test of insulation samples immersed in oil;

Note: Other testing methods can be customized according to user requirements.

Breakdown field strength

The electric field strength at the time of breakdown depends on the geometric shape of the dielectric (insulator) and the electric field applied to the electrode, as well as the rate of increase in which the electric field is applied. Due to the small defects typically present in dielectric materials, the actual dielectric strength will be a part of the inherent dielectric strength of an ideal defect free material. Compared to thicker samples of the same material, the dielectric film tends to exhibit higher dielectric strength. For example, the dielectric strength of a silica film with a thickness of several hundred nanometers to several micrometers is approximately 0.5GV/m. However, very thin layers (such as 100 nanometers below) become due to partially conductive electron tunneling. In places where the maximum actual dielectric strength is required, such as high-voltage capacitors and pulse transformers, multi-layer thin dielectric films are used. Due to the fact that the insulation strength of a gas depends on the shape and structure of the electrode, it is usually measured as a portion of the dielectric strength of nitrogen gas

Test software:

1. This instrument can draw real-time curves for the voltage breakdown process during the experiment. The voltage rise curve of each experiment is composed of different colors, and after the experiment, the repeatability of the test data of the comparative material can be superimposed.

2. You can access current and historical experimental data at any time for viewing, editing, and modifying parameters.

3. During the experiment, the test conditions and storage path can be modified at any time, and the test results can be automatically stored.

4. During the experiment, the validity of this experiment can be determined at any time through software, making it easier to screen the test results.

5. The operation password can be set to enable dedicated personnel to operate the machine, avoiding accidental operations by unrelated personnel.

Structural principles and performance characteristics:

1. Mainly composed of boosting system, measurement system, A/D converter, discharge system, electrodes, oil tank, electrode positioning frame, computer data processing system, software, etc;

2. Computer - A/D converter - Measurement control system - Voltage regulating device - Booster transformer - Sample;

3. The high-voltage transformer mainly generates the DC voltage required for the sample;

4. The voltage regulator is used to regulate the input voltage of the step-up transformer to generate the input voltage required for high voltage;

5. Voltage measurement is mainly measured from the measurement end of the high-voltage transformer, and the measurement end and high-voltage end of the high-voltage transformer are linear;

6. The discharge system should be discharged after the test is completed to avoid any harm to human health caused by discharge; (After the experiment is completed, there may still be residual high voltage in the machine components, which is sufficient to cause fatal injury to humans. Equipping this rod effectively solves this safety hazard.).

Product features

1. An independent installation software running on the WIN XP/WIN7/WIN8 system, with a user-friendly interface and simple operation

2. Experimental display curve, automatic data storage, automatic search

3. Multiple uses can be used for accurate, reliable, and safe AC and DC testing

4. Computer controlled experimental process, automatic judgment stop, automatic reset

5. Multiple protections such as overvoltage, overcurrent, short circuit, leakage, and misoperation