Sidactor Protection Thyristor Products Page 50 SIDACtor Protection Thyristor Products

SIDACtor Protection Thyristors 2017 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 02/23/17 YD/T 993-1998 establishes the technical requirements and test methods for lightning protection of telecommunication terminal equipment for Mainland China. This Chinese Standard parallels the ITU-T K.21 "Resistibility of Subscriber's Terminal to Overvoltages and Overcurrents" (1996) document very closely. This standard is the technical basis for simulated lightning induced event testing requirements for Telecommunication Terminal Equipment such as modems, fax machines, telephone sets, and so on. Normal operation of EUT is not required during the lightning surge simulation test. However, all functions of the EUT should meet the requirements of relevant standards after the completion of these tests. All lightning surge simulation tests should be conducted at: Temperature: 15 C - 35 C Relative humidity: 5% - 75% Air pressure: 86 - 56 kPa Once the lightning surge simulation testing is completed, an electric isolation test is conducted. The power is removed from the unit for this test. Measure the insulation with 500 V dc voltage after the completion of the insulation test. The resistance should be no less than 2 M. Table 3.42 Surge Simulations - Tip & Ring Connections Lightning Surge Test Conditions Voltage and Current Waveform s Test Voltage / Current * (kV/A) Without Primary Protection Metallic Test Single Tip and Ring Pair 10x700 / 5x310 1.5/37.5 Longitudinal Test Single Tip and Ring Pair 10x700 / 5x310 1/25 All Tip and Ring Pair 10x700 / 5x310 1/25 With Primary Protection Metallic Test Single Tip and Ring Pair 10x700 / 5x310 4/100 Longitudinal Test Single Tip and Ring Pair 10x700 / 5x310 4/100 All Tip and Ring Pair 10x700 / 5x310 4/100 * All tests are conducted 5 times with at least one minute between events. Table 3.43 Surge Simulations - Power Line Connections Lightning Surge Test Conditions Voltage and Current Waveform s Test Voltage / Current * (kV/A) Without Primary Protection Metallic Test Power Line 1.2x50 / 8x20 1.5/750 Longitudinal Test Power Line 1.2x50 / 8x20 1/83.3 With Primary Protection Metallic Test Power Line 1.2x50 / 8x20 4/2000 Longitudinal Test Power Line 1.2x50 / 8x20 4/333.3 Table 3.44 Electrical Insulation Test Equipment Type Voltage / Current V&I Waveform s Repetition Handheld 2.5 kV / 62.5 A 10x700 / 5x310 5 Non-handheld 1.5 kV / 37.5 A 10x700 / 5x310 5 Regulatory Requirements (continued) Mainland China Standard - YD/T 993-1998

Previous Page
Next Page