This standard specifies the items, cycles, and requirements for preventive testing of tools, devices, and equipment for live working, in order to determine whether the tools, devices, and equipment meet the conditions of use, prevent their damage, and ensure the safety of personnel and equipment during live working. This standard applies to tools, devices, and equipment used for live working in AC and DC power systems. This standard does not apply to tools, devices, and equipment used for live working in special environments. The relevant technical parameters of this standard are applicable to areas with an altitude of 1000m and below: in areas with an altitude of 1000m or above, the relevant parameters should undergo altitude correction. The following normative references are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document. GB/T 2900.55 Electrotechnical Terminology for Live Working GB/T 3804 3.6kV~40.SkV High Voltage AC Load Switches GB/T 11022 Common Technical Requirements for High Voltage Switchgear and Control Equipment Standards GB/T 14286 Live Working Tools and Equipment Terminology GB/T 16927.1 High Voltage Testing Technology Part 1: General Test Requirements DLT740 Capacitive Tester DLT 971 Portable Nuclear Phase Tester for Live Working 3 Terms and Definitions by GB/T 2900.55 The terms and definitions defined in GB/T 14286 and the following apply to this document. 3.1 Preventive test is a periodic inspection, test, or testing conducted to identify potential hazards in live working tools, devices, and equipment, and to prevent equipment or personal accidents. 3.2 AC withstand voltage test a.c. with stand voltage test: A test that applies a specified power frequency test voltage (effective value) to the insulation to verify its good insulation performance. 3.3 DC withstand voltage test d.c. with stand voltage test is a test that applies a specified DC test voltage to the insulation to verify its good insulation performance. 3.4 Switching impulse with stand voltage test The test of applying a specified number of times and value of switching impulse voltage to insulation. By applying multiple operating impulse voltages, it is verified that the actual statistical operating impulse withstand voltage is not lower than the rated operating impulse withstand voltage with acceptable confidence
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