DL/T 294.4-2019Specification for equipment of de-excitation and overvoltage protection for generators - Part 4: De-excitation capacity calculation (English PDF)

Foreword

This standard was formulated in accordance with the provisions of GB/T 1.1-2009 "Guidelines for Standardization Work Part 1: Standard Structure and Compilation".

Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.

This standard was proposed by the Standardization Management Center of the China Electricity Council.

This standard is under the jurisdiction of the Electric Power Industry Hydropower Station Automation Standardization Technical Committee.

The "Technical Conditions for Generator De-excitation and Rotor Overvoltage Protection Device" is divided into four parts.

Technical requirements for generator de-excitation and rotor overvoltage protection device Part 1: Field circuit breaker;

Technical requirements for generator demagnetization and rotor overvoltage protection device. Part 2: Non-linear resistance;

Technical requirements for generator demagnetization and rotor overvoltage protection device. Part 3: Rotor overvoltage protection device;

Technical requirements for generator de-excitation and rotor overvoltage protection device. Part 4: Calculation of de-excitation capacity;

This standard is part 4.

Drafting organizations of this standard. State Grid Jiangxi Electric Power Co., Ltd. Electric Power Research Institute, State Grid Zhejiang Jiang Province Electric Power Co., Ltd. Electric Power Research Institute Drafters of this standard. Xu Qipin, Xin Jianbo, Yang Ming, Wu Kuayu, Xie Yanjun, Yuan Yazhou, Xu Zaide, Deng Xiaojun, Geng Minbiao, Wei Wei, Wang Kun for comments and suggestions during the implementation of this standard, please feedback to the Standardization Management Center of China Electricity Council (Baiguang, Xicheng District, Beijing) Lu Er Tiao No. 1, 100761).

This standard is issued for the first time.

Technical conditions of generator de-excitation and rotor overvoltage protection device Part 4 Calculation of Demagnetization Capacity

1 Scope

This standard specifies the demagnetization capacity of synchronous generators (hereinafter referred to as generators) and rotor overvoltage protection devices the calculation principle and method are the basis for selecting the demagnetization resistance capacity.

This standard is applicable to the calculation of demagnetization capacity of salient pole and recessed pole generators with damping windings with a single unit capacity of 10MW and above.

Refer to the implementation for generators below 10MW.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version is suitable Used in this document. For undated references, the latest version (including all amendments) applies to this document.

DL/T 294.2 Technical conditions of generator demagnetization and rotor overvoltage protection device Part 2: Non-linear resistance DL/T 583 Technical conditions of static rectification excitation system and device for large and medium hydro-generator

3 Terms and definitions

The following terms and definitions apply to this document.

De-excitation

Refers to the process of transferring and consuming the magnetic field energy in the stator and rotor of a generator. The methods of demagnetization mainly include. demagnetization Turn-off de-excitation, freewheeling de-excitation, inverter de-excitation, linear de-excitation, nonlinear de-excitation, combined de-excitation, etc.

De-excitation capacity Refers to the energy transferred and consumed in the de-excitation process, including consumption in the rotor de-excitation circuit, damping winding and stator winding in the energy.

4 Calculation steps and methods of generator rotor de-excitation circuit capacity