Detail of YD/T 1235.2-2002

Introduction of YD/T 1235.2-2002

1 Scope This standard specifies testing methods for surge protective devices connected to low-voltage distribution systems of telecommunication stations/sites (hereinafter referred to as "surge protective device"). This standard is applicable to quality inspection and assessment of surge protective device connected to low-voltage distribution system of telecommunication stations/sites at all levels (low-voltage side of distribution transformer, a.c. input end of distribution room and power room, a.c and d.c. distribution cabinet (box) at each machine room). Surge protective device integrated in the equipment may refer to it. 2 Normative References The following normative documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest edition of the normative document referred to applies.

Contents of YD/T 1235.2-2002

Contents Foreword I 1 Scope 2 Normative References 3 Terms and Definitions 4 General Requirements for Tests 4.1 General Requirements 4.2 Test Condition 4.3 Test Waveform 5 Overall Quality Inspection 5.1 Appearance Inspection 5.2 Inspection of Modes of Protection 5.3 SPD Disconnector Inspection 5.4 Alarm Inspection 5.5 Inspection of Capability of Wiring Terminal to Connect Conductor 6 Surge Protection Property Test 6.1 Maximum Continuous Operating Voltage Test 6.2 Basic Measured Limiting Voltage Test 6.3 Test to Determine Voltage Protection Level 6.4 Operating Duty Test 7 Safety Performance Test 7.1 Inspection of Electric Clearance and Creepage Distance 7.2 Test of Enclosure Protection Degree 7.3 Protective Earthing Inspection 7.4 Fire Hazard Test (Glow-wire Test) 7.5 Safety Test for Temporary Overvoltage Failure 7.6 Test of Temporary Overvoltage Withstand Characteristic 7.7 SPD Thermal Stability Test 8 Additional Test of Two-port SPD and One-port SPD Having Separate Input/Output Terminals 8.1 Voltage Drop Test 8.2 Surge Withstand Capability at Load side 8.3 Short-circuit Withstand Capability at Load Side 9 Environmental Applicability Test 9.1 Vibration Test 9.2 High Temperature Test 9.3 Low Temperature Test 9.4 Alternating Humid Heat Test 10 Inspection Rules 10.1 Acceptance Inspection 10.2 Type Test