Basis for compliance with this requirement
1.1 YD/T694-1999 "General Distribution Frame"
1.2 YD/T940-1999 "Semiconductor Tubes for Overvoltage Protection of Communication Equipment"
1.3 YD/T741-2002 "Technical Requirements for Positive Temperature Coefficient (PTC) Thermistor for Overcurrent Protection of Communication Equipment"
1.4 GB/T2828.1—2003/ISO 2859-1: 1999 "Counting Sampling Inspection Procedure"
Test items, test methods and technical requirements
3.1 Appearance structure, installation dimensions and appearance inspection
3.1.1 The appearance structure and installation dimensions meet the requirements of the drawings. The rounded welding points are clean and tidy without defects and cracks. The colors meet the requirements and the colors of the finished products are consistent.
3.1.2 There should be a clear product model and registered trademark logo on the product. The logo should be firm and in the correct position.
3.1.3 The packaging box meets the requirements, and the product name and model marks on the packaging box are obvious; the work number, inspection number, and certificate in the box are complete. Test instrument: Insulation resistance tester
3.2 Insulation resistance requirements: the insulation resistance between a and b lines, and between a and b lines and ground lines, alarm signal lines, and other metal parts under normal atmospheric conditions (temperature 15-35°C, relative humidity 45-75 %, air pressure 8 6-106Kpa, the same below) not less than 1000MΩ, (not less than 100MΩ after high temperature test, low temperature test, temperature change test and damp heat test).
Test method: The insulation resistance of the test sample should be between each tested terminal and all the other terminals connected to the housing or the mounting plate (that is, between any two terminals that are not conductive to each other and any terminal is fixed to the metal The test results should meet the above requirements. Test equipment: DM-100B digital micro-ohm, micro-voltmeter
3.3 Contact resistance The contact resistance between the pin of the security unit and the terminal (or reed, the same below) between the pins of the security unit (or security seat, the same below); Requirements: (1) Under normal atmospheric conditions, the contact between the two reeds The contact resistance between is not more than 7m Ω (after high temperature test, low temperature test, temperature change test and humid heat test, the contact resistance value added is not more than 3mΩ.) The security unit is inserted and removed at a frequency of 10-15 times per minute on the security arrangement Secondly, the contact resistance between the pins of the security unit and the terminals of the security arrangement is not greater than 3mΩ. In addition to the contact resistance requirement to reach the specified index, the security unit and the security arrangement must be pluggable and light, and feel good.
3.4 Alarm signal
The alarm signal is clearly visible when the security unit is activated.
3.5 Overvoltage protection performance parameters (Note 1)
a DC breakdown voltage Udc=230±3040 9
b Insulation resistance: ≥1×10 Ω
3.6 Overcurrent protection performance
3.6.1 PTC performance performance (Note 2)
a Normal temperature resistance ≤22Ω, a and b line resistance difference ≤2Ω; (After impact current resistance, power frequency current resistance, power frequency voltage resistance and retest value after various environmental tests) Imported PTC normal temperature resistance 6.4－ 9.6Ω (8Ω±20%)
b No action current, 110mA1h no action, (Test voltage 60Vdc, ambient temperature at 40℃)
c Current limiting characteristics (at 25°C), see Table 1
Table 1
|
Electric current （A）
|
Action time（S）
|
Remarks
|
|
0.35
|
≤18
|
Current interruption or current limit to
150mA
|
|
0.5
|
≤10
|
|
1
|
≤1
|
Current interruption or current limit to
500mA
|
|
3
|
≤0.2
|
3.6.2 Inner cable fuse (tube) performance
Safe current: 0.4A for 1 hour without action
Action current: 1A>0.5S action, 2A≤0.5S action
3.6.3 Outline fuse (tube) performance
Safe current: 5A1 hour without action;
Action current: 10A millisecond action.
3.7 Failure protection performance
Test equipment: NLT-1 type failure protection and alarm tester
When the discharge current of the discharge tube reaches 2.5Arms, the a line or b line in the discharge circuit should be grounded within 15S.
3.8 Combustion performance test of plastic parts, etc.
The quality requirements of the plastic parts in the security unit shall be in accordance with the relevant provisions of the factory inspection document "General Requirements for Flame-retardant ABS Raw Materials and Plastic Parts".
3.9 quality requirements for electroplated parts
The quality requirements of the electroplated parts in the security unit shall be in accordance with the relevant provisions of the factory inspection document "General Requirements for Electroplated Parts".
The determination methods of the overall supervision of the security unit and the detailed rules for inspection implementation are as follows:
Sampling according to GB/T2828.1—2003/ISO 2859-1:1999 “Counting Sampling Inspection Procedure”, the supervision quality level is P0=0.25%, the inspection level is level II, and the security unit implementation rules are shown in Table 2.
Table 2
|
Serial number
|
Test items
|
Inspection sample (this)
|
Remarks
|
|
1
|
Exterior
|
Ⅱ
|
Normal temperature environment
|
|
2
|
Insulation resistance
|
Ⅱ
|
After normal temperature, low temperature, high temperature, temperature change and damp heat test
|
|
3
|
Contact resistance between security unit and terminal block
|
S-3
|
After normal temperature, low temperature, high temperature, temperature change and damp heat test, after plugging and unplugging 200 times
|
|
4
|
Fail-safe performance and alarm function
|
S-3
|
Normal temperature environment
|
|
5
|
Overvoltage protection performance
|
Ⅱ
|
|
6
|
Overcurrent protection performance
|
Ⅱ
|
|
7
|
Insulation material burning performance
|
S-3
|
Normal temperature environment according to GB5169.7-85
|
|
8
|
Quality requirements for electroplated parts
|
Ⅱ
|
Normal temperature environment
|
Note (1): The DC breakdown voltage of the discharge tube and other indexes other than the insulation resistance test are carried out when the discharge tube enters the factory and when the security unit routine test is sent for inspection. For the test procedure, see "Technical requirements and test methods of semiconductor discharge tubes" ".
Note (2): Indicators other than those specified in the "Overcurrent Protection Performance" of the overcurrent protection device shall be carried out when the overcurrent protection equipment enters the factory and when the security unit routine test is submitted for inspection. For the inspection procedures, see "Technical Requirements and Test Methods of Positive Temperature Coefficient (PTC) Thermistors for Overcurrent Protection of Communication Equipment"
Note (3): The high temperature test, low temperature test, temperature change test, and damp heat test of the security unit are carried out when the routine test is submitted for inspection.
