This standard specifies the basic requirements for the permissible deviation of the frequency of the power system and its measuring instruments. This standard applies to power systems with a nominal frequency of 50Hz under normal operation. This standard does not apply to the permissible frequency deviation of electrical equipment. GB/T 15945-1995 Power Quality Permissible Frequency Deviation of Power System GB/T15945-1995 Standard download decompression password: www.bzxz.net

ICS_27.010
National Standard of the People's Republic of China
GB/T15945—1995
Electric energy quality
Permissible deviation of frequency for power system
Quality of electric energy supplyPermissible deviation of frequency for power system1995-12-21Promulgated
State Administration of Technical Supervision
Implementation on 1996-08-01
National Standard of the People's Republic of China
Permissible deviation of frequency for power system
Electric energy quality
Quality of electric energy supplyPermissible deviation of frequency for power systemSubject content and scope of application
This standard specifies the basic requirements for the permissible deviation of the frequency of the power system and its measuring instruments. This standard applies to power systems with a nominal frequency of 50Hz under normal operation. This standard does not apply to the permissible deviation of the frequency of electrical equipment. 2 Terms
2.1 Frequency deviation frequencydeviation The difference between the actual value and the nominal value of the system frequency. 2.2 Frequency variation frequencyvariation The difference between adjacent extreme frequencies during frequency variation. 2.3 Impact load impactload
GB/T15945-1995
A load that periodically or non-periodically takes rapidly changing power from the power grid during production (or operation). 3 Allowable value of frequency deviation
3.1 The allowable value of normal frequency deviation of the power system is ±0.2Hz. When the system capacity is small, the deviation value can be relaxed to ±0.5Hz. 3.2 The system frequency change caused by user impact load shall generally not exceed +0.2Hz. The limit value may also be appropriately changed according to the nature and size of the impact load and the conditions of the system, but the safety, stable operation and normal power supply of the nearby power grid, generator sets and users shall be guaranteed. 4 Measuring instruments
Measurements used for frequency deviation index evaluation must use digital automatic recording instruments with statistical functions, and their absolute error shall not exceed 0.01Hz.
Additional notes:
This standard is proposed and managed by the National Technical Committee for Voltage, Current and Frequency Standardization. This standard is drafted by the National Standard Working Group for "Permissible Deviation of Frequency of Power Quality Power System". This standard is drafted by the Electric Power Research Institute, the Machinery Standardization Research Institute, the National Electric Power Dispatching Center, the Ministry of Electric Power Information Institute, the Textile Machinery Research Institute, the Traction Electrical Equipment Research Institute and other units. The main drafters of this standard are Lin Haixue, Yu Xinmin, Lei Xiaomeng, Xiang Haiping, Cao Junmei, Luo Xinchao and Cai Jiao. Approved by the State Bureau of Technical Supervision on December 21, 1995, and implemented on August 1, 1996
People's Republic of China
National Standard
Power Quality Permissible Deviation of Power System Frequency GB/T15945—1995
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Format 880×12301/16 Printing sheet 1/4 Number of words 2,000 First edition in August 1996 First printing in August 1996 Number of copies 1 to 2,000
Book number: 155066·1-12481
Heading 289-112
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