GB/T 31487.2-2015 in English

《GB/T 31487.2-2015直流融冰装置 第2部分：晶闸管阀》由TC60（全国电力电子系统和设备标准化技术委员会）归口，TC60SC2（全国电力电子系统和设备标准化技术委员会输配电系统电力电子技术分会）执行，主管部门为中国电器工业协会。
GB/T31487的本部分规定了直流融冰装置晶闸管阀的功能、设计和试验等的基本要求。
本部分适用于直流融冰装置水冷却晶闸管阀,采用其他冷却方式的晶闸管阀可参照本部分。

Direct current de-icing devices—Part 2: Thyristor valves

1 Scope

This part of GB/T 31487 specifies the basic requirements for the function, design and test of thyristor valves of DC de-icing devices.

This part is applicable to water cooling thyristor valves of DC de-icing devices. It may also serve as a reference for thyristor valves adopting other cooling methods.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 3859.1-2013 Semiconductor converters - General requirements and line commutated converters - Part 1-1: Specification of basic requirements
GB/T 13498 Terminology for high-voltage direct current (HVDC) transmission
GB/T 16927.1 High-voltage test techniques - Part 1: General definitions and test requirements
GB/T 20990.1-2007 Thyristor valves for high voltage direct current (HVDC) power transmission - Part 1: Electrical testing
GB 50150-2006 Standard for hand-over test of electric equipment electric equipment installation engineering
IEC/TS 60815-1: 2008 Selection dimensioning of high-voltage insulators intended fuse in polluted conditions - Part 1: Definitions, information general principles
IEC 61803: 2011 Determination of power losses in high-voltage direct current (HVDC) converter stations with line-commutated converters

3 Terms and definitions

For the purposes of this document, the terms and definitions given in GB/T 13498 and the following apply.
 
3.1
valve
electrical and mechanical combination composed of power electronic devices and auxiliary components, which can realize unidirectional or bidirectional conduction

Note: At present, the commonly used valves include diode valves, thyristor valves, insulated-gate bipolar transistors (IGBT), etc.

3.2
thyristor valve
valve whose power electronic devices are thyristor valves

3.3
converter
electrical device capable of realizing complete commutation function

3.4
single valve
valve composed of several thyristor levels in series, which is an arm of 6-pulse converter

3.5
thyristor level
component of a valve, which consists of a thyristor or several parallel thyristors and auxiliary equipment adjacent to them

3.6
valve electronics
electronic circuit that performs control, monitoring and protection functions at valve potential

3.7
valve base electronics
electronic equipment that provides an interface between a ground potential control equipment and valve electronics or valve device, also known as a valve interface electronic equipment

3.8
firing angle
time from the forward zero crossing of the ideal sinusoidal commutation voltage to the beginning of the forward current conduction, measured from an electrical angle
 
3.9
rated direct current
direct current (average value) output by the converter according to the specified load conditions and service conditions

3.10
maximum direct current
maximum direct current output by the converter to the load under specified operating conditions (theoretically within an infinite time)

Note: Generally, there are different values under different cooling media and ambient temperature.

3.11
2h overload direct current
direct current that the converter can output to the load within the specified 2h

Note: Generally, there are different values under different cooling media and ambient temperature.

3.12
maximum ideal no-load direct voltage
maximum direct voltage (Udi0max) of the converter under no-load condition

Note: At this time, all kinds of voltage drops and grid voltage fluctuation factors are ignored.

3.13
rated direct voltage
average value that the direct voltage output by converter shall reach under the specified conditions

3.14
rated direct power
product of rated direct voltage and rated direct current of converter

3.15
coefficient of current distribution
ratio of the average value of branch current in parallel operation to the maximum branch current value when the thyristor valve of DC de-icing device adopts double-bridge parallel connection type

3.16
rated junction temperature
maximum junction temperature allowed for normal operation of thyristor
 
3.17
large angle and high current operation
operation mode in which DC de-icing device outputs rated direct current output and the firing angle is approximately 90°

3.18
zero power test
test for inspecting the direct current control function and current withstand capacity of the DC de-icing device, in which the direct current side of the DC de-icing device is short-circuited through a reactor and the direct current is increased to the set value

4 Technical requirements

4.1 Environmental conditions

The normal use environment conditions of thyristor valve of DC de-icing device include the following aspects:

a) the altitude is less than 2,000m;

b) the ambient temperature is not less than -20°C and not higher than 50°C;

c) the maximum relative humidity is 85% (below 20°C);

d) the pollution grade is b;

e) the magnitude of the earthquake is not more than Grade 8;

f) the frequency fluctuation range of AC power grid shall not exceed ±5%.

Note 1: When the altitude is greater than 2,000m, the altitude correction design shall be carried out according to relevant standards.

Note 2: The outdoor pollution grades are designed generally according to Grade d in IEC/TS 60815-1: 2008.

4.2 Access system

The converter of DC de-icing device should be connected to the low voltage side (10kV or 35kV) of the main transformer meeting the de-icing capacity requirements through special converter transformer or commutation reactor, or directly connected to the low voltage side of the main transformer. Otherwise, it shall be connected to the upper power bus through a special transformer.

4.3 Load properties

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
4.1 Environmental conditions
4.2 Access system
4.3 Load properties
4.4 Functional requirements
5 Electrical connection type of thyristor valve
6 Design of thyristor valve
6.1 Electrical design of thyristor valve
6.2 Mechanical design of thyristor valve
6.3 Thermal design of thyristor valve
7 Tests
7.1 Introduction
7.2 Type test and routine test
7.3 Field test
Annex A (Normative) Loss calculation method of thyristor valve