T/WZSJD 2301-2023 Open-close zero-sequence current transformer

Scope

Scope: This document specifies the terms and definitions, classification, models, basic parameters, and external dimensions of open-and-close electromagnetic zero-sequence current transformers (hereinafter referred to as "current transformers") used in indoor electrical protection and automation devices, with a frequency range of 15 Hz to 100 Hz and a maximum equipment voltage of 0.4 kV to 35 kV. Main technical content: This standard specifies the terms and definitions, classification, models, basic parameters, and external dimensions of open-and-close electromagnetic zero-sequence current transformers (hereinafter referred to as "current transformers"), as well as their normal and special operating conditions, rated values, design and structure, test methods, inspection rules, transportation, storage, installation, operation, and maintenance rules, safety, product impact on the natural environment, and quality and service commitments. This standard applies to indoor electrical protection and automation devices using a frequency range of 15 Hz to 100 Hz and a maximum equipment voltage of 0.4 kV to 35 kV. The standard primarily defines zero-sequence current transformers according to their structure, which can be divided into enclosed and open-and-close types. These two types have different structures and performance indicators. This standard provides a definition of open-and-close zero-sequence current transformers, classifies them based on three aspects: installation method, appearance, and shell insulation type, and specifies model and naming rules. It also sets forth basic parameter and external dimension requirements. The standard stipulates the basic operating conditions and technical requirements of open-and-close zero-sequence current transformers, design and structure requirements, and tests methods adapted from national standards for open-and-close zero-sequence current transformers. It also specifies type testing and factory inspection rules, transportatio

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