GOST 11677-85 PDF

Full title and description

GOST 11677-85 — "Power transformers. General specifications." This interstate (GOST) standard establishes general technical requirements, ratings, testing and documentation rules for power and autotransformers intended for general-purpose power-supply use (three-phase and single-phase units above small kVA classes), covering voltage classes up to 1150 kV inclusive.

Abstract

GOST 11677-85 defines classification, marking, main electrical and mechanical requirements, allowable operating regimes, cooling types, insulation and oil requirements, type and routine tests, safety and documentation for general-purpose power transformers. It is intended to harmonize national practice for manufacture, acceptance testing and operation of distribution and power transformers and to reference relevant IEC and GOST normative documents.

General information

• Status: Active / in force (standard with amendments and later reprints; commonly referenced in technical documents and product specifications).
• Publication date: Introduced 01 July 1986 (date of entry into force); later reprints and amendments published (reissue 1999 and amendments issued in 1987–1991).
• Publisher: Gosstandart / Interstate standards bodies (GOST system; originally approved by USSR State Standard, later maintained in the GOST/RS system).
• ICS / categories: Electrotechnical standards — transformers and reactors (commonly classified under ICS 29.180 / power transformers category).
• Edition / version: Original designation GOST 11677-85 (1986). Text circulated with at least four recorded amendments and a 1999 reissue incorporating changes.
• Number of pages: Approximately 39 pages (standard text with tables and annexes as reissued).

Summary information above compiled from authoritative standards registries and published reprints of GOST 11677-85.

Scope

The standard applies to general-purpose power transformers (including autotransformers and transformers for station auxiliary needs and complete transformer substations), covering three-phase transformers above ~5 kV·A and single-phase above ~4 kV·A, for voltage classes up to 1150 kV inclusive. It excludes special-purpose, regulating and multi-winding transformers when specific technical conditions apply. The standard sets requirements for designation, ratings, permissible continuous regimes, cooling types, mechanical construction, insulation and oil treatment, and mandatory tests.

Key topics and requirements

• Definitions and classification of transformer types (two-winding, autotransformer, three- and single-phase units).
• Rated parameters: nominal power, voltage classes, vector groups, tap-changer arrangements and allowable tolerances.
• Constructional requirements for magnetic core, winding insulation, tanks (including corrugated/pleated tanks), gaskets and expansion or nitrogen-bag protection for oil-filled units.
• Cooling systems and designation of cooling types (natural, forced air, forced oil, combinations) with associated performance requirements.
• Insulation and dielectric requirements for oil and non-combustible liquid dielectrics; conditioning, breathers and oil-drying devices.
• Temperature-rise limits, overload rules and allowable continuous operating regimes for windings and oil.
• Short-circuit withstand and mechanical strength requirements (including pressure and vacuum tests for sealed designs).
• Type, routine and special tests (including insulation, temperature-rise, noise, dielectric tests and short-circuit tests) and sampling rules.
• Marking, documentation, transport and storage instructions, and acceptance criteria.
• Safety and environmental requirements referenced to related GOSTs and to IEC 60076 series where applicable.

Key technical content summarizes mandatory clauses and common manufacturer/utility interpretation used in procurement and testing.

Typical use and users

Primary users are transformer manufacturers, utility and industrial electrical engineers, testing laboratories, procurement/specification writers, regulatory authorities and maintenance personnel. The standard is used when designing, specifying, testing, accepting and operating oil-filled and dry-type power transformers for distribution and transmission substations, industrial plants and power stations. Manufacturer datasheets and tender documents often cite GOST 11677-85 compliance for equipment destined for markets using GOST norms.

Related standards

GOST 11677-85 references and aligns with multiple IEC and national documents. Typical related standards include the IEC 60076 series (power transformer standards) and numerous GOST/GOST R norms covering insulation, oil testing, safety, dimensional and testing practices (examples: GOST 21427.1 on steel for magnetic cores, GOST 17516.1 on environmental categories, and others listed as normative references in the standard).

Keywords

power transformer, GOST 11677-85, transformers, autotransformer, cooling, insulation, oil-filled transformer, type tests, routine tests, vector groups, tap-changer, temperature rise, short-circuit withstand, IEC 60076.

FAQ

Q: What is this standard?

A: GOST 11677-85 is the Interstate (GOST) standard titled "Power transformers. General specifications" that sets out general technical requirements and testing rules for general-purpose power transformers.

Q: What does it cover?

A: It covers classification, rated parameters, constructional and insulation requirements, cooling types, allowable operating regimes, testing (type and routine), marking and documentation for power transformers intended for distribution and power networks (excluding specially conditioned or regulating multi-winding types).

Q: Who typically uses it?

A: Transformer manufacturers, utilities, design institutes, test laboratories, procurement/specification writers and maintenance teams use the standard when designing, specifying, accepting and operating power transformers in regions that reference GOST standards.

Q: Is it current or superseded?

A: The standard was introduced in 1986 (GOST 11677-85) and has recorded amendments and reprints; publicly available registries list it as active (in-force) with later editorial updates and reissues. Users should check the latest national standards registry or standards body for the current legal/regulated status before formal use.

Q: Is it part of a series?

A: It is the overarching general-specification standard for power transformers and is typically used alongside a set of related standards (both IEC 60076 parts and numerous GOST/GOST R documents) that cover specific tests, materials and safety requirements.

Q: What are the key keywords?

A: Power transformers, autotransformers, cooling types, insulation, oil-filled, type tests, routine tests, vector group, tap-changer, temperature rise.