1 Scope
This standard specifies basic technical requirements, used terms and definitions, calculation methods, tests and technical documents of static rectified excitation system and device for large and medium hydraulic generator.
This standard is applicable to application and order requirements of the static rectified excitation system and device for large and medium hydraulic generator (hereinafter referred to as the generator) with unit capacity being 10MW or above. Currently, the self-shunt excitation system is the primary of rectified excitation system and other modes of system have been hardly used already. Therefore, this standard is mainly applicable to self-shunt excitation system and the rectified excitation system may also refer to it.
2 Normative References
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding corrigenda), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document applies.
GB 1094.1 Power Transformers - Part 1: General
GB 1094.2 Power Transformers - Part 2: Temperature Rise
GB 1094.3 Power Transformers - Part 3: Insulation Levels and Dielectric Tests
GB 4208 Degrees of Protection Provided by Enclosure (IP Code)
GB 6450 Dry-type Power Transformers
GB/T 17626 Electromagnetic Compatibility - Testing and Measurement Techniques
DL/T 489-2006 Test Regulation for Static Rectified Excitation Systems and Devices for Large and Medium Hydraulic Generators
IEEE std 421.4 Recommended Practice for Excitation System Models for Power System Stability Studies
IEC61000-4 Electromagnetic Compatibility (EMC) Part4: Testing and Measurement Techniques
IEC61000-6-5 Electromagnetic Compatibility (EMC) Part 6-5: Generic Standards - Immunity for Power Station and Substation Environments
3 Terms and Definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
Excitation system
The equipment to provide excitation current for synchronous generator, including all regulation, control, unit and power source protection and de-excitation devices.
3.2
Static rectified excitation system and device
The system and device to provide regulable field current for synchronous generator using static thyristor rectifier to rectify the AC power source into DC power source. It includes excitation transformer, power rectifier unit, excitation regulator, voltage building, de-excitation, protection and monitoring devices and instruments.
3.3
Excitation regulator
The device to carry out real-time closed-loop regulation for terminal voltage, reactive power, power factor and rotor current of synchronous generator according to certain regulation law.
3.4
Automatic voltage regulator
The device to realize regulation according to constant terminal voltage regulation mode and realize relevant limit protection functions, also referred to as automatic (regulation) channel.
3.5
Field current regulator
The device to realize regulation according to constant field current regulation mode and realize relevant limit protection functions, also referred to as manual (regulation) channel.
3.6
Excitation system rated current
The maximum output DC current (this current must be greater than 1.1 times of rated field current of synchronous generator, namely the maximum excitation current of generator for long continuous operation including the changed caused by voltage, frequency and power factor of generator) provided by excitation system for long-term continuous operation under specified operation condition.
3.7
Excitation system rated voltage
The DC voltage of output terminal provided by the excitation system under the rated load of synchronous generator during continuous operation where the excitation system outputs rated current.
3.8
Excitation system ceiling current
The maximum DC current outputted by excitation system within the specified forced excitation time.
3.9
Excitation system ceiling voltage
The average of rectified voltage on both ends of excitation winding at the instant that the excitation current reaches the specified excitation system ceiling current during the forced excitation of excitation system. The rated field current is taken as the initial field current of forced excitation and the temperature (calculated according to 120℃) of excitation winding of generator operated under the rated condition is taken as the initial excitation winding temperature.
3.10
Ratio of ceiling current
The ratio of excitation system ceiling current to rated field current.
3.11
Ratio of ceiling voltage
The ratio of excitation system ceiling voltage to rated field voltage.
3.12
Rated field current
The DC current in field winding where the synchronous generator operates under the rated voltage, current, power factor and rotation speed.
3.13
No-load field current
The field current of generator required by generating the rated voltage where the synchronous generator operates under no-load and rated rotation speed.
3.14
Rated field voltage
The DC voltage required by jumper at field winding ends of synchronous generator where the synchronous generator operates under the continuous rated load. Where the rated operation temperature rise in field winding design is less than or equal to 60℃, the temperature of field winding is 75℃. Where the rated operation temperature rise in field winding design is greater than 60℃, the temperature of field winding is 100℃.
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Basic Technical Requirements
5 Test
6 Technical Documents
Appendix A (Normative) Electromagnetic Compatibility Test Grades and Standards
