Standard No.:	SD 325-1989
English Name:	Guideline of power system voltage and reactive power technology
Chinese Name:	电力系统电压和无功电力技术导则
Chinese Classification:	F21    Electric power system
Professional Classification:	SD    Professional Standard - Hydropower
Issued by:	MOE
Issued on:	20-Mar-89
Implemented on:	1989-8-1
Status:	superseded
Superseded by:	DL/T 1773-2017 Technical guide for electric power system voltage and reactive compensation
Superseded on:	2018-6-1
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	100.0
Delivery:	via email in 1 business day

1 General Provisions 1.1 The voltage is the important index of electric energy quality. The voltage quality has important effect on safe and economical operation of power system guaranteeing safe production of user and product quality as well as safety and service life of electrical equipments. This guide specifies the permissible deviation value of the voltage for all-level bus bars and user receiving end of power system and the technical measures of voltage and reactive power regulation. 1.2 The reactive compensation and reactive balance of power system is the essential condition to guarantee voltage quality. The effective voltage control and reasonable reactive compensation not only can guarantee voltage quality, but also improve stability and safety of power system operation, and give full play to economic benefit. 1.3 Each department of power system shall comply with this guide when carrying out planning, design, capital construction, operation and power utilization management working.

Contents 1 General Provisions 2 Terms 3 Basic Requirements 4 Permissible Deviation Value of Voltage 5 Balance and Compensation of Reactive Power 6 Selection of Reactive Compensation Equipment 7 Network Structure 8 Voltage Regulation Mode and Range Selection of Transformer 9 Voltage Regulation and Monitoring of Power System Appendix A Calculation for Coefficient K Value of Natural Reactive Load in Power Grid Additional Explanation