GOST 10121-76 PDF

Full title and description

GOST 10121-76 — "Масло трансформаторное селективной очистки. Технические условия" (English: Transformer oil of selective purification. Specifications). The standard defines technical requirements, composition limits and test/acceptance rules for transformer insulating oil produced by selective purification and containing specified antioxidant additives.

Abstract

GOST 10121-76 establishes specifications for transformer oil of selective purification (often marketed as TSO), including minimum antioxidant content (2,6-di-tert-butyl-p-cresol — ionol or equivalent), required physical and electrical properties, test methods, packaging, marking and acceptance rules. It was developed for use in insulating and cooling electrical transformers and related power equipment.

General information

• Status: Active (standard text with subsequent amendments and republications remains in technical use).
• Publication date: Introduced / in effect from 1 January 1977 (approved by the USSR State Committee for Standards by decision of 21 January 1976).
• Publisher: Approved by the State Committee for Standards of the USSR (Gosstandart); originally developed by the Ministry of Oil Refining and Petrochemical Industry of the USSR.
• ICS / categories: MKS (ICS) 75.100 (petroleum products / oils); OKP 02 5351 0600 (classification used in the original registry).
• Edition / version: Original 1976/1977 edition; contains Amendments No.1–7 issued between 1979 and 1990; later reprints/editions available (noted republication references 2011).
• Number of pages: Varies by publisher/format — bibliographic records list approximately 4–6 pages depending on the distributed edition.

Scope

This standard applies to transformer insulating oil obtained by selective purification and intended for use as dielectric and cooling fluid in electrical transformers and similar equipment. It sets minimum requirements for composition (including antioxidant additive content not less than 0.2% of 2,6-di-tert-butyl-p-cresol or equivalent), physical and electrical properties, sampling and test methods, packaging, marking and storage. The standard replaces earlier versions (for example, ГОСТ 10121-62) and includes multiple later amendments.

Key topics and requirements

• Chemical composition and required minimum antioxidant (ionol/BHT) content (≥0.2% as specified).
• Physical property limits: density, kinematic viscosity at reference temperatures, and limits on mechanical impurities.
• Safety and performance properties: specified flash-point method and minimum flash temperature in a closed cup, acidity/neutralization number limits and other safety-related parameters.
• Electrical performance: tests for dielectric strength / breakdown characteristics and other electrical acceptance tests relevant to transformer service.
• Sampling, test methods and references to other GOST test procedures used for measuring properties (density, viscosity, flash point, mechanical impurities, etc.).
• Requirements for packaging, marking, storage and acceptance (delivery) conditions for commercial supply of transformer oil.

Typical use and users

Primary users are electric utilities, transformer manufacturers and repair workshops, oil producers and suppliers, testing laboratories and quality control departments responsible for procurement and maintenance of insulating fluids in power transformers and switchgear. Industrial suppliers and chemical distributors list oils compliant with this standard for transformer servicing and replacement.

Related standards

GOST 10121-76 is linked to and references or replaces prior standards such as ГОСТ 10121-62 and ГОСТ 5.2151-74; related normative documents include other GOSTs used for test methods and property limits (for example standards for flash point determination, viscosity, density and impurity analysis). Subsequent national/regional documents and technical regulations on transformer oils may also cross-reference these requirements.

Keywords

transformer oil; insulating oil; selective purification; TSO; ionol; antioxidant; dielectric oil; flash point; viscosity; dielectric strength; ГОСТ 10121-76.

FAQ

Q: What is this standard?

A: GOST 10121-76 is a Soviet / interstate technical standard titled "Transformer oil of selective purification. Specifications" that defines composition, physical, electrical and safety requirements and test/acceptance rules for transformer insulating oil obtained by selective purification.

Q: What does it cover?

A: It covers the required chemical composition (including minimum antioxidant content), physical and electrical property limits, sampling and test methods, packaging, marking, storage and acceptance criteria for transformer oil produced by selective purification.

Q: Who typically uses it?

A: Electric utilities, transformer manufacturers and repair shops, oil producers and suppliers, and testing/quality laboratories use this standard as a specification for procuring and verifying transformer insulating oil.

Q: Is it current or superseded?

A: Bibliographic records indicate the standard remains in the regulatory record with a set of amendments (Amendments 1–7, issued 1979–1990) and is shown as active in available standards databases and repositories; users should verify the current status with the official standards body or current national catalogues before relying on it for regulatory compliance.

Q: Is it part of a series?

A: The document is part of the family of GOST standards for transformer and insulating oils and related test methods; it directly replaces earlier versions (for example ГОСТ 10121-62) and cross-references other GOST test-method standards.

Q: What are the key keywords?

A: Transformer oil, selective purification, TSO, ionol (BHT), antioxidant, insulating oil, dielectric strength, flash point, viscosity, ГОСТ 10121-76.