GB/T 20840.11-2025 Active National standards

GB/T 20840.11-2025 Instrument transformers—Part 11:Additional requirements for low-power passive voltage transformers

Publish Date: 2025-02-28 Implement Date: 2025-09-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Basic Information

Standard Code: GB/T 20840.11-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Transformer

ICS Name: Transformers, reactors, and inductors

Publish Date: 2025-02-28

Implement Date: 2025-09-01

Pages: 40 pages

Scope

This document specifies additional technical requirements for low-power passive voltage transformers (LPVTs) with only analog voltage output in terms of terminology and definitions, rated values, design and structure, testing and consulting, bidding and ordering guidelines, etc. This document applies to newly manufactured analog output LPVTs with a rated frequency of 15 Hz to 100 Hz, intended for use in electrical measurement instruments or relay protection devices for measurement and protection purposes, or for both measurement and protection functions. This document does not apply to passive LPVTs with derivative output signals, nor to electronic voltage transformers with digital output or those employing any type of active electronic components. Note: Passive LPVTs only have analog voltage output (for digital output or technologies using any type of active electronic components, please refer to GB/T 20840.7). Such passive LPVTs may include secondary signal cables (transmission cables). The secondary voltage of passive LPVTs is proportional to the primary voltage.