Principles of Relay Protection in Electric Power Systems

1 Scope

DL/T 849This section stipulates the general technical requirements, testing methods, inspection rules, marking, packaging, transportation, and storage of ultra-low frequency high-voltage generators (hereinafter referred to as the generator).

This section is applicable to ultra-low frequency AC high-voltage tests on capacitive test pieces (such as power cables, large generator stators, etc.) and other similar equipment tests.

All imported testing equipment with similar detection functions from overseas shall be implemented in accordance with this section.

2 Standard Reference Documents

The terms in the following documents have been approved.DL/T 849References to this section shall be deemed to be references to this section as a whole. Any referenced documents dated, subsequent modifications (excluding errata) or revised editions thereof shall not apply to this section; however, it is encouraged that the parties entering into agreements based on this section investigate the possibility of using new versions of these documents. Any referenced documents not dated...

Document, its new version is applicable to this section.

GB 191 Packing and Storage Diagrammatic SymbolsEQV ISO 780：1997

GB/T 2900.5Electrical Insulating Materials

GB/T 2900.19 Electrical Engineering Terminology: High Voltage Testing Techniques and Insulation Coordination

GB/T 6587.1 Electrical Measurement Instrument Environmental Test Outline

GB/T 6587.2 Electronic Measurement Instrument Temperature Test

GB/T 6587.3 Electronic Measurement Instrument Moisture Test

GB/T 6587.4 Electromagnetic Measurement Instrument Vibration Test

GB/T 7328 Transformer and Reactor Noise Level Measurement

3 Terms and Definitions

GB/T 2900.5No Chinese content provided.GB/T 2900.19Established terms and definitions apply.DL/T 849The following section of the company's news.

3.1 Cosine Wavecosine square wave

From the peak value90%No content provided for translation.90%No Chinese content provided.90%As peak as can be90%The polarity conversion time does not exceed10msNo Chinese content provided.

3.2 Ultra-low Frequency High-Voltage Generatorvery low frequency high-voltage generator

Output voltage frequency is less than or equal tolHzA high-voltage power supply unit with output waveforms as either sine or cosine square waves.

3.3 Rated Output Voltagerated output voltage

The peak voltage of the high-voltage output waveform of the ultra-low frequency high-voltage generator meets the technical requirements.

3.4 Rated Capacityrated capacity

The ultra-low frequency high-voltage generator is designed to handle a large capacitance of test samples at its high-voltage output terminal.