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Performance test methods and standards for terminal blocks

Datetime: 2019-12-16    Visit: 480
The appearance of the terminal block looks simple, but the terminal block must also undergo rigorous product verification tests and periodic production type experiments. This article mainly introduces the content, methods and judgment standards of the mechanical performance, electrical performance and environmental performance test of the terminal.

I. Mechanical performance test

1.Tightening Torque Test

The purpose of the torque test is to test whether the screw has sufficient mechanical strength to ensure that no slipping occurs during the crimping process. If the screw does not break or deform after the test, there is no damage to the screw head groove that affects continued use. It is qualified.

2. Secureness Test

The purpose of crimping reliability test is to test whether the terminal can clamp the wire without undue damage to the wire. Use the terminal to connect the wires of the specified type and rated cross-sectional area, hang a certain weight, and rotate at a speed of 10 revolutions (10 ± 2r / min) per minute for 15 minutes. After testing, the crimping reliability of the terminal is acceptable if the wire does not slide out of the terminal clamp or break near the clamp. If the clamping mechanism of the wire breaks or falls out of the terminal, it is unqualified.

3. Pull Out Test

的 The purpose of the pull test is to test that the terminal can firmly clamp the wire between the metal surfaces. Use the terminal to connect the conductor of the specified type and rated cross-sectional area, select a certain force (lkgf), and pull the conductor towards the axis of the conductor for 1 min. It is acceptable if the wire does not come out of the terminal.

4. Mechanical Strength Test

The purpose of the mechanical strength test is to test whether the terminal has sufficient mechanical strength, especially to test whether the housing of the terminal has sufficient mechanical strength. During the test, put a sample into the drum of the test equipment, rotate it at a speed of 5 revolutions per minute, shut down for 5 minutes and take out the sample to observe. If the terminal is not damaged, the shell is not cracked, damaged, etc , It is qualified.

5. Fatigue Test

The purpose of the mechanical life test is to test whether the elastic components of the terminal can withstand a certain number of insertions or other mechanical operations, such as the compression and release of spring-type terminal buttons. If the tested elastic component is assembled into the terminal, the mechanical and electrical performance should still meet the requirements, then it is qualified.

Second, electrical performance test

1. Contact Resistance Test

The contact resistance test is to test the static contact performance of the terminals, that is, the contact resistance should not be greater than a certain value.

2, Power-Frequency Withstand Voltage Test

The power frequency withstand voltage test is to test whether the terminal housing can withstand the specified transient or short-term power frequency overvoltage. During the test, no flashover or breakdown shall occur.

3. Impulse Withstand Voltage Test

The impact withstand voltage test is to test whether the terminal housing can withstand the specified transient overvoltage. There shall be no destructive discharge during the test.

4. Voltage Drop Test

The voltage drop test is to test the dynamic contact performance of the terminal. The voltage drop should not be greater than a certain value.

5. Temperature Rise Test

The temperature rise test is that the temperature rise of the test terminal during normal use cannot exceed the specified value. Generally, the UL standard stipulates that the temperature rise of the terminal after the current is passed must not exceed 30 ° C of the ambient temperature.

6. Electrical Performance Test

Electrical performance test is to test the reliability of the electrical performance of non-threaded terminals in normal use. After the terminal has undergone 192 cycles, its voltage drop during the 24th and last cycle must not be greater than a certain value.

Third, the environmental performance test

1, Packaging Test for Package (Vibration Test for Package)

Packaging vibration test is to simulate the ability of the package of the terminal to withstand vibration during transportation. After the test, the terminal in the package must not be affected or damaged.

2, Vibration Test for Products

The product vibration test is to simulate the ability of the terminal to withstand vibration during use. Fix the front, rear, left and right, and top and bottom of the terminal on the vibration table in order, and apply the specified analog quantities to the X, Y, and Z axis directions of the terminals. After testing, the terminals must not be damaged.

3. Test for Flammability of Plastic Materials

The flame retardant test is to test the flame retardant performance of the terminal material. During the test, clamp the standard sample strip to the clamp holder of the instrument test, move the fire source to the specified position to ignite and burn to the prescribed time and remove the fire source. If the fire source is removed, the sample strip still burns or The drips ignite the cotton under the sample strip, and the flame retardance is unacceptable. If the sample strip is extinguished by itself after the fire source is removed, the flame retardance is acceptable.

4. Resistance Aging Test

The aging resistance test is to test whether the terminal can be used normally at a certain high temperature. The terminal is placed in an aging test box, and a high temperature of 105 ° C or 120 ° C is applied for 7 days. If the terminal under test is not aged, it is qualified.

5. Damp Heat Test

Alternative damp heat test is to test whether the terminal can withstand the humid conditions that may occur in normal use.

6. Salt Spray Test

The salt spray test is also a test of whether the terminals can withstand the humid conditions that may occur during normal use. It is only a separate test on the metal parts of the terminals. After testing, if the metal parts are rusted, it is unqualified.