High Voltage Leakage Trace Testing Machine

DX8427 High-voltage leakage trace testing machine

1,Scope of application:

Mainly suitable for testing the resistance of electrical and electronic products, household appliances, and their materials to electrical trace and corrosion, simulating the use of liquid pollutants and inclined surface specimens at power frequency (48Hz -62Hz). Evaluate the resistance level of electrical insulation materials used under harsh environmental conditions through the measurement of resistance to electrification and corrosion..Under the influence of moisture and impurities in electrical products, insulation leakage may occur between charged parts of different polarities or between charged parts and grounded metal. The resulting arc can cause breakdown, short circuit, or material erosion due to discharge, and even lead to fire. This tester is a destructive test that simulates the above situation on insulation materials, used to measure and evaluate the relative resistance to leakage and marking of insulators under the action of an electric field and impurity containing water at a specified voltage. It is suitable for solid electrical insulation materials and their products in electrical and electronic products, household appliances, such as relay sockets, conversion switch covers, contactors, etc.

2, Compliant with standards:

According to the requirements of GB/T6553-2014/IEC60587-1984 "Test Method for Evaluating the Resistance of Electrical Insulation Materials to Tracing and Corrosion under Severe Environmental Conditions" and DL/T810-2002 "Technical Conditions for ± 500kV DC Rod Suspension Composite Insulators", the simulation test items specified in the standard for AC/DC Leakage Tracing Test of Insulation Materials, applicable to rubber, plastic and other electrical insulation materials such as inclined plane method. Standard for five sets of silicone rubber testers and silicone testers

Technical parameters:

Electrode: 0.5mm thick Material: stainless steel;

Distance between upper and lower electrodes: 50.0mm ± 0.1;

Test voltage: 100V-6000V stepless adjustable;

Voltage regulator: Output: adjustable from 0～250V, with a capacity of 5KVA;

When the circuit current is 60mA, cut off the voltage output;

Test time: 6 hours;

Dropping accuracy: 0.5%;

Voltage stability: ± 1%;

High precision voltage regulator: Output AC220V. Power 6000W. Accuracy ± 1%;

Test transformer: Capacity 5KVA. Maximum output voltage AC6000V (or DC6000V optional);

Trace detection: According to the standard GB/T6553-2003/4.1.2, apply a voltage (2.5kV, 3 5kV and 4.5kV), and drip the contaminated liquid at a certain flow rate. If the current is below 60mA for 6 hours without flowing, it is considered passing;

Dropping device: using a Ralph precision peristaltic pump, with a flow range of 0.00185-20 milliliters per minute, a working speed of 0.1-50 revolutions per minute, and a flow accuracy error of less than 0.5%;

Output voltage: AC/DC (switchable)

Case: Made of SUS304 stainless steel (brushed surface);

The sewage tank is made of 316 stainless steel and equipped with a sealing device.

Volume is 0.56m3, studio volume: 900L * 650W * 950H (mm);

Instrument dimensions: 1200L * 750W * 1800H (mm), length 750 * width 1180 * height 1760mm, wooden box 890 * 1320 * 1900

Weight: approximately 200KG

Control device: Adopting Siemens PLC+Taiwan Weinview touch screen control, precise control, simple operation, fully humanized design, automatic report generation after the test, and panel thermal printer can print test results in a timely manner;

Number of test groups: Five groups (during the test, one pump controls one group of droplets, and the testing process does not affect each other, which is not commonly seen in the market as one pump controls five groups) (can be tested separately or together)

Test steps:

Preparation for the experiment: Unless otherwise specified, the experiment should be conducted at an ambient temperature of (23±2)℃, with five specimens tested for each material. When installing the sample, the matte test surface should be facing downwards, making it at a 45° angle with the horizontal plane. As shown in Figure 3b, the distance between the two electrodes is (50 ± 0.5) mm

Note:Use new filter paper pads for each experiment.

Firstly, inject the contaminated liquid into the filter paper liner to fully moisten the filter paper. Adjust the flow rate of the contaminated liquid and correct the flow rate according to the provisions in Table 1. Observe the flow for at least 10 minutes to ensure that the contaminated liquid flows steadily down the surface of the sample between the two electrodes. The contaminated liquid should flow out from the axial hole of the upper electrode instead of overflowing from the side or top of the filter paper.

Apply voltage

Method 1: Constant voltage tracing method.

When the contaminated liquid flows uniformly at the flow rate specified in Table 1, close the switch and increase the voltage to one of the more suitable voltage values of 2.5 kV, 3.5 kV, or 4.5 kV. Start timing and keep the voltage constant for 6 hours.

If it is necessary to test at a higher or lower voltage, another set of five samples will be taken for each preferred test voltage for testing.

The constant electrical trace voltage is the highest voltage at which all five samples have not been damaged after being subjected to 6 hours.

Materials are classified as follows:

Level 1A0 or 1B0: According to judgment standard A or judgment standard B, if any sample fails within 6 hours at 2.5kV;

Level 1A2.5 or 1B2.5: If all five specimens can withstand a voltage of 2.5kV for 6 hours and any specimen fails within 6 hours at 3.5kV;

Level 1A3.5 or 1B3.5: If all five specimens can withstand a voltage of 3.5kV for 6 hours and any specimen fails within 6 hours at 4.5kV;

Level IA4.5 or 1B4.5 : If all five samples can withstand a voltage of 4.5kV for 6 hours; In each case, the maximum depth of erosion should be reported

Method 2: Stepwise voltage tracing method:

Choose a starting voltage with a value that is a multiple of 250V, starting from the beginning, so that there is no violation of judgment standard A (current exceeding 60 mA) before the third level voltage (a preliminary test may be required). When the contaminated liquid flows uniformly at the specified flow rate, close the switch and increase the voltage to the selected value, maintain the voltage for 1 hour, and then gradually increase the voltage by 250 V every hour until the damage according to judgment standard A occurs, and record it. When the voltage increases, the flow rate of the contaminated liquid and the resistance value of the series resistor should also increase according to the provisions in Table 1.

The stepwise electrochemical voltage is the highest voltage at which all five samples have not been damaged after being subjected to Ih.

Materials are classified as follows:

2Ax level, where x is the highest voltage that the tested material can withstand, expressed in kV.

Note1: There will inevitably be significant flickering phenomenon. If not, the circuit, flow of contaminated liquid, and resistivity of contaminated liquid should be carefully checked.

Flashing refers to a small yellow to white (occasionally blue in some materials) arc appearing directly above the lower electrode teeth within a few minutes of applying voltage.

Although discharge may jump from one tooth to another before a stable small bright "hotspot" ultimately occurs, these discharges are basically carried out in a continuous manner. These "hotspots" can burn the surface of the sample and may ultimately lead to electrochemical damage. Rapid discharge on the surface of the sample between the two electrodes may not cause tracking.

Significant scintillation phenomena can also be observed using a cathode ray oscilloscope. A signal can be obtained from both ends of a resistor (such as 3301Z, 2W) connected in series with an overcurrent device.

Normal flicker can be observed from the continuous, but uneven, and interrupted power frequency current waveform every half cycle.

Note2: Before the trace reaches the upper electrode, when a 60mA current flows through the conductive trace and the electrolyte retained on the surface of the sample, the overcurrent device should be activated.

Note3: The depth of erosion should be measured after scraping or using other methods to remove decomposed insulation and debris. Be careful not to remove undamaged test materials.

This instrument is designed strictly in accordance with GB/T6553-2003 and IEC60587-2007 standards.

Standard based on: GB/T6553-2014/IEC60587:2007 Test Method for Evaluation of Resistance to Traceability and Corrosion of Electrical Insulation Materials Used under Severe Environmental Conditions

Method 1: Constant voltage tracing method;

Method 2: Stepwise voltage tracing method.

Latest standard GB/T6553-2014/IEC60587:2007

The main differences between GB/T6553-2014 and GB/T6553-2003 are:

This standard is drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 6553-2003<<Test Method for Evaluating the Resistance of Electrical Insulation Materials to Tracing and Corrosion under Severe Environmental Conditions>.

Compared with GB/T 6553-2003, the main changes in this standard are as follows:

——The name of this standard has been changed to "Test Method for Evaluation of Resistance to Traceability and Corrosion of Electrical Insulation Materials Used under Severe Environmental Conditions";

——The power frequency has been changed from "48 Hz -62 Hz" to "45 Hz -65 Hz" (see Chapter 1, 2003 edition Chapter 1);

——The cleaning of the sample is clearly specified in the sample preparation (see 3.2, 2003 version 3.2);

——Change "... can act when exceeding 60 mA for 2 seconds..." to "... can act when exceeding 60 mA or 6 mA for 2 to 3 seconds..." (see 4.1.4 of version 4.1.4, 2003);

——Added "4.6 ventilation device" (see 4-6);

-1. Change "at an angle of 45 ° to the horizontal" to "at an angle of 45 ° ± 2 ° to the horizontal" and add the content "5 specimens can be tested together or independently" (see 5.1.2 of version 5.1.2, 2003);

1. Added the content of "bracket" and "illustrated examples" (see 5.1.3 of version 5.1.3, 2003);

This standard 5.4 replaces the content of the endpoint judgment standard in Chapter 1 of GB/T 6553... 2003 and adds the content "When the sample has holes due to concentrated corrosion or catches fire, it is considered to have reached the endpoint" (see Chapter l of version 5.42003).

The translation method used in this standard is equivalent to using IEC 60587:2007<Test Method for Evaluation of Resistance to Traceability and Corrosion of Electrical Insulation Materials Used under Severe Environmental Conditions>.

This standard is proposed by the China Electrical Industry Association.

This standard is under the jurisdiction of the National Technical Committee for the Evaluation and Standardization of Electrical Insulation Materials and Insulation Systems (SAC/TC 301).

The main drafting units of this standard are Guilin Electric Appliance Science Research Institute Co., Ltd., Shenzhen Institute of Standards and Technology, Guangdong Biaomei Silicon Fluoride New Materials Co., Ltd., and Beijing Institute of Electrical Technology and Economics in the Machinery Industry.

The main drafters of this standard are Wang Xianfeng, Liu Zhiyuan, Sun Rong, Song Yan, Huang Zhenhong, Liu Yali, Chen Yuhui, Weng Simiei, Lu Wencan, Tang Ying, and Guo Liping.

The previous versions of this standard have been released as follows:

——GB/T 6553-1986, GB/T 6553-2003.