GOST 4194-88 PDF

Full title and description

GOST 4194-88 — "Картон электроизоляционный для трансформаторов и аппаратов с масляным заполнением. Технические условия" (Electroinsulating board for transformers and apparatus charged with oil — Specifications). This standard specifies technical requirements for oil‑service electroinsulating cardboard (transformerboard / electrokarton) used in transformers and other oil‑filled electrical apparatus.

Abstract

GOST 4194-88 defines classification, grades, permissible dimensions and physical and electrical properties (density, dielectric strength, moisture, ash content, allowable working temperature), marking, packaging and acceptance rules for electroinsulating cardboard intended for use inside oil‑filled transformers and similar equipment. It is intended to ensure reliable electrical insulation and mechanical performance in oil environments.

General information

• Status: Active / In force (ДЕЙСТВУЕТ).
• Publication date: Issued as GOST 4194‑88 (1988); introduced 1 January 1990; re‑issued edition noted 1996.
• Publisher: Interstate standard (GOST) — original approval and maintenance by the state standards body (Gosstandart / Межгосударственный стандарт).
• ICS / categories: OKS/ICS classification related to electrical engineering / insulating materials (recorded as ОКС 29.035.10).
• Edition / version: GOST 4194‑88 (the 1988 designation; replaces the earlier GOST 4194‑83).
• Number of pages: 17 pages (standard text length as published in databases).

Scope

The standard applies to electroinsulating cardboard manufactured for use in transformers and oil‑filled electrical apparatus at working temperatures up to approximately 105 °C. It covers grades intended specifically for oil‑immersed applications and defines the technical conditions for production, testing and acceptance.

Key topics and requirements

• Classification and grades of electroinsulating cardboard for oil‑filled equipment (common grades include A, B, ЭВ / presshpan types depending on density and intended use).
• Dimensional specifications — standard sheet formats and typical thickness ranges (examples in commerce: 0.4–3.0 mm; common sheet sizes 1000×1500 mm, 1000×2000 mm or 1500×1020 mm depending on producer).
• Electrical requirements — dielectric strength/electrical breakdown characteristics suitable for transformer insulation and oil environments.
• Physical requirements — density ranges, moisture content limits, ash content and mechanical strength to ensure dimensional stability and compatibility with oil.
• Marking, packaging and acceptance testing procedures — including test methods, sampling and quality certificates for delivery.

Typical use and users

Main users are transformer and electrical apparatus manufacturers, electrical repair and rewind workshops, insulation material suppliers and designers of oil‑filled power equipment. Secondary users include suppliers of technical boards for electrical engineering and some non‑electrical applications (templates, packaging, craft uses) where the material's mechanical properties are useful.

Related standards

GOST 4194‑88 replaces GOST 4194‑83 and is related to other insulating material standards (references in practice may include national GOSTs for insulating papers and boards and international norms for transformerboard such as IEC/EN series for insulating boards). Specific production and grade references (e.g., manufacturing to related GOSTs or equivalence notes) are cited in product datasheets and supplier literature.

Keywords

GOST 4194-88, electroinsulating cardboard, transformerboard, electrokarton, presshpan, oil‑filled apparatus insulation, insulating cardboard, grades A/B/ЭВ.

FAQ

Q: What is this standard?

A: GOST 4194‑88 is a state (interstate) standard that sets technical requirements for electroinsulating cardboard intended for use inside oil‑filled transformers and similar apparatus.

Q: What does it cover?

A: It covers material classification, grades, dimensional and electrical/physical requirements, marking, packaging and acceptance/testing procedures for oil‑service insulating cardboard.

Q: Who typically uses it?

A: Transformer manufacturers, electrical equipment producers, rewind and repair shops, insulation material suppliers and quality departments that specify or verify transformer insulation components.

Q: Is it current or superseded?

A: GOST 4194‑88 is recorded as in force (active) in standards databases and is the replacement for GOST 4194‑83; consult national standards authorities or official standards catalogs for the latest legal status or any amendments.

Q: Is it part of a series?

A: It belongs to the body of GOST standards covering insulating papers and boards for electrical engineering; related GOSTs and technical conditions cover other insulating materials and test methods. Internationally, comparable documents for transformerboard exist in IEC/EN series (product norms vary by region).

Q: What are the key keywords?

A: Electroinsulating cardboard, transformerboard, electrokarton, presshpan, oil‑filled apparatus, dielectric strength, insulating grades A/B/EV.