This standard specifies the product classification, technical requirements, test methods, inspection rules, markings, user manuals, packaging, transportation, storage, and other contents of delay intermediate relays. This standard applies to delay intermediate relays (hereinafter referred to as relays) used in the secondary circuit of power systems. This type of relay is used as an auxiliary relay in the secondary circuit of the power system to delay the action time or return time and increase the contact number, contact capacity, or conversion circuit of the previous relay. This standard only applies to new relays. 2 Normative References: The clauses in the following documents become clauses of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GB/T 2900.1-1992 Basic Terminology of Electrical Terminology (neq IEC 60050) GBT 2900.17-1994 Electrical Terminology Electrical Relays GB/T 7261-2000 Basic Test Methods for Relays and Devices JB/T 7828-1995 Technical Conditions for Packaging, Storage and Transport of Relays and Devices JB/T9568-2000 Power System Relays General technical conditions for protection and automatic devices - JB/T 10103-1999- Method for designating relay and device product models - Terms and definitions established in GB/T 2900.1-1992 and GB/T 2900.17-1994 are applicable to this standard. 4. Crystal Classification 4.1 Types and Classification: The composition principle of relays is electromagnetic type and static type, which are classified as follows: a) According to installation method: protruding type and embedded type; b) According to wiring method: front wiring and rear wiring; c) According to structural type: plug-in type and non plug-in type; d) According to delay method: delayed action and delayed return. 4.2 Model and Meaning: The formulation of relay models shall comply with the provisions of JB/T 10103-1999. 4.3 Zhuanding parameter a) Rated DC working voltage: 12V 24V, 48V 110V, 220V; b) Rated DC working current: 0.25A, 0.5A, 1A, 2A, 4A 6A. 4.4 Each specification is specified by the enterprise product standard. 4.5 The external dimensions and installation dimensions are specified by the enterprise product standards
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