Sidactor Protection Thyristor Products Page 48 SIDACtor Protection Thyristor Products

SIDACtor Protection Thyristors 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/23/17 YD/T 950-1998 establishes the technical requirements and test methods for protection against overvoltages and overcurrents on telecommunication switching equipment for Mainland China. This Standard is based on the ITU-T Recommendation K.20 "Resistibility of Telecommunication Equipment Installed in a Telecommunications Center for Overvoltages and Overcurrents" (1996 version). It was approved by the Ministry of Information Industry of the People's Republic of China on August 7, 1998 and has been in effect since September 1, 1998. The following major transmission parameters and interface feature parameters of the equipment should comply with requirements contained in GF 002-9002 or YD 344: Transmission loss Loss frequency distortion Gains changing with input level Cross talk Scratching noise Return loss Unbalanced earth impedance After the following tests are conducted, the equipment should provide normal communications functions and comply with these requirements. Without primary protection: 1. When the lightning waveform is 10/700 s and the peak voltage is 1 kV 2. When the induction voltage of the power line is 600 V rms and the duration is 0.2 s With primary protection: 1. When the lightning waveform is 10/700 s and the peak voltage is 4 kV 2. When the induction voltage of the power line is 600 V rms and the duration is 1 s Without primary protection, the equipment should be fireproof when it is in contact with power lines with a voltage of 220 V rms for a duration of 15 minutes and should provide normal communications functions after the test. After the equipment is tested for contact discharge at an electrostatic voltage of 6 kV or for air discharge at 8 kV, it should provide normal communications functions. Technical Requirements Test Methods All tests should be conducted in the following standard atmospheric conditions: Temperature: 15 C ~ 35 C Relative humidity: 45% ~ 75% Air pressure: 86 ~ 106 kP Test procedure sequence is as follows: 1. Normal equipment operation 2. Characteristics and parameters 3. Simulation of lightning strike 4. Check of functions 5. Power line induction 6. Check of functions 7. Check of functions 8. ESD 9. Check of functions 10. Power line contact 11. Characteristics and parameters Power Line Induction Without primary protection: 600 V, 1 A, 0.2 s applied between Tip and Ring to Ground five times With primary protection: 600 V, 1 A, 1 s applied between Tip and Ring to Ground five times Time between successive events shall be one minute. Characteristics and parameters shall be tested within 30 minutes after the completion of these events. Power Line Contact Without primary protection: 220 V rms @ 0.367 A, 1.1 A, 22 A for 15 minutes applied between Tip and Ring to Ground one time each With primary protection: 220 V rms 0.367 A for 15 minutes applied between Tip and Ring to Ground five times ESD (electrostatic discharge) 5 repetitions direct contact with one-second duration between successive discharges 5 repetitions indirect contact (0.1 m distance) with one- second duration between successive discharges For additional information, please refer to Table 3.40 and 3.41 on the following page. Regulatory Requirements (continued) Mainland China Standard - YD/T 950-1998

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