GOST 9680-77 PDF

Full title and description

GOST 9680-77 — "Трансформаторы силовые мощностью 0,01 кВ·А и более. Ряд номинальных мощностей" (Power transformers from 0.01 kVA and above. Series of power ratings). The standard specifies preferred series of rated powers for single‑phase and three‑phase power transformers and autotransformers (with exclusions for certain specialized and measuring transformers).

Abstract

GOST 9680-77 establishes the series of nominal (rated) power values to be used when specifying and manufacturing power transformers and autotransformers of 0.01 kVA and above. It defines the preferred values, allows special/export values in parentheses, and gives rules for choosing one‑phase ratings for transformers intended to operate in three‑phase groups. The standard aligns its rated‑power series with contemporaneous IEC and CMEA recommendations.

General information

• Status: Active / in force (originally approved 1977; regularly referenced in standards databases).
• Publication date: Approved 27 October 1977; published November 1977; entry into force 1 January 1979.
• Publisher: State Committee for Standards of the Council of Ministers of the USSR (Gosstandart); official printing by Izdatel'stvo standartov (Standards Publishing House).
• ICS / categories: Electrotechnics / power transformers; document group E64; classification marker DK 621.314.2216:006.354.
• Edition / version: GOST 9680‑77 (1977 edition), replacing GOST 9680‑61.
• Number of pages: 4 pages (official printed edition).

Scope

The standard applies to three‑phase and single‑phase power transformers and autotransformers of rated power 0.01 kVA and above, including units intended for export. It does not apply to transformers for feeding radio/electronic equipment, household appliance transformers, or measuring (instrument) transformers, though the standard's recommendations may be used for those types where appropriate. It also states compatibility of the rated‑power series with IEC Publication No.76‑1 (1976) and CMEA recommendations.

Key topics and requirements

• Definition of preferred series of nominal (rated) powers for transformers starting at 0.01 kVA and progressing by decades and preferred multipliers (examples include values such as 0.01; 0.016; 0.025; 0.04; 0.063; 0.1; 0.16; 0.25; 0.4; 0.63; 1.0; 1.6; 2.5; 4.0; 6.3; 10; etc., extending through large decades). Parenthetical values in the standard are identified as allowable only for special or export transformers.
• Rule that nominal powers for single‑phase transformers intended for use in three‑phase groups should be one third of the corresponding three‑phase rated powers; otherwise single‑phase rated values may match the three‑phase series.
• Allowance for agreement between manufacturer and purchaser to set non‑standard values for special applications (for example, transformers paired with very large generators).
• Reference to terms defined by other GOSTs (e.g., ГОСТ 16110‑70 and ГОСТ 19294‑73) and alignment with international/regional recommendations (IEC and CMEA).

Typical use and users

Used by power‑transformer designers and manufacturers, electrical engineering design institutes, utilities and power system planners, procurement specialists specifying transformer ratings, testing and conformity bodies, and standards/technical libraries. It is a normative reference for selection of rated power values during design, tendering and production planning.

Related standards

Directly refers to or aligns with: - IEC Publication No.76‑1 (1976) on preferred transformer ratings and related recommendations. - Earlier national version GOST 9680‑61 (replaced by the 1977 edition). - Related GOSTs for terminology and definitions such as ГОСТ 16110‑70 and ГОСТ 19294‑73. The standard is also cited across national catalogs and transformer technical specifications.

Keywords

power transformer, autotransformer, nominal power, rated power series, preferred values, kVA, transformer ratings, GOST 9680‑77, electrotechnics.

FAQ

Q: What is this standard?

A: GOST 9680‑77 is a Soviet/Russian state standard that defines the series of nominal (rated) power values for power transformers and autotransformers of 0.01 kVA and above.

Q: What does it cover?

A: It covers the sequence of preferred rated powers (numerical series and allowed special/export values), rules for choosing single‑phase ratings for three‑phase use, and conditions allowing non‑standard ratings by agreement between purchaser and manufacturer. It excludes small‑signal, household and measuring transformers by direct scope statement.

Q: Who typically uses it?

A: Transformer manufacturers, design engineers, utilities, procurement/specification authors, conformity assessment bodies, and standards libraries use it when selecting or verifying rated transformer powers.

Q: Is it current or superseded?

A: The document GOST 9680‑77 is the 1977 edition that replaced GOST 9680‑61. Multiple standards catalogs list GOST 9680‑77 as the in‑force (active) normative reference for the rated‑power series; for any regulatory or procurement use you should verify the status with the applicable national/regional standards authority or current standards catalog.

Q: Is it part of a series?

A: It is a single, short (4‑page) standard focused on rated‑power series; it references and complements other electrotechnical GOSTs and international recommendations (IEC and CMEA). It replaces an earlier national edition (GOST 9680‑61).

Q: What are the key keywords?

A: Power transformer, autotransformer, nominal/rated power, kVA series, preferred values, export values, transformer specification.