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GB/T 12668.6-2011: Adjustable speed electrical power drive systems -- Part 6: Guide for determination of types of load duty and corresponding current ratings
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Adjustable speed electrical power drive systems -- Part 6: Guide for determination of types of load duty and corresponding current ratings
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GB/T 12668.6-2011
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Basic data | Standard ID | GB/T 12668.6-2011 (GB/T12668.6-2011) | | Description (Translated English) | Adjustable speed electrical power drive systems -- Part 6: Guide for determination of types of load duty and corresponding current ratings | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | K62 | | Classification of International Standard | 29.160.30; 29.020 | | Word Count Estimation | 14,188 | | Date of Issue | 2011-06-16 | | Date of Implementation | 2011-12-01 | | Older Standard (superseded by this standard) | GB/T 3886.1-2001 | | Quoted Standard | IEC 60146-1-1, IEC 61800-1, IEC 61800-2 | | Adopted Standard | IECTR 61800-6: 2003, IDT | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 9 of 2011 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the speed electric drive systems (PDS) in particular, its basic drive module (BDM) rating of alternative methods. This section does not cover towing speed transmission. | GB/T 12668.6-2011: Adjustable speed electrical power drive systems -- Part 6: Guide for determination of types of load duty and corresponding current ratings
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Adjustable speed electrical power drive systems.Part 6. Guide for determinatinon of types of load duty and respective current ratings
ICS 29.160.30; 29.020
K62
National Standards of People's Republic of China
Replace GB/T 3886.1-2001
Speed control electric drive system part 6.
Determine the type of load work and
Guidelines for corresponding current ratings
Part 6. Guidefordeterminationoftypesofloaddutyand
(IEC /T R61800-6.2003, IDT)
2011-06-16 released.2011-12-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Content
Foreword III
1 General 1
1.1 Scope and purpose 1
1.2 Normative references 1
2 Terms and definitions, symbol 1
2.1 Terms and Definitions 1
2.2 Symbol 4
3 rating 5
3.1 General requirements 5
3.2 Method for determining the rated current-time value of semiconductor devices and devices 5
3.3 Rated current of equipment and converter group 6
3.4 Overload capability and surge current capability 9
4 Category 9 of non-repetitive load working system
Foreword
GB/T 12688 "Speed Control Electric Drive System" is divided into the following parts.
---Part 1. The specification of the rated value of the low-voltage DC-regulated electric drive system;
--- Part 2. The specification of the rated value of the low-voltage AC variable frequency electric drive system;
--- Part 3. Electromagnetic compatibility requirements and their specific test methods;
---Part 4. The regulation of the rated value of AC speed control electric drive system with AC voltage above 1000V but not exceeding 35kV;
--- Part 5. Safety requirements;
--- Part 6. Guidelines for determining the type of load duty and the corresponding current rating;
--- Part 7. General specifications and specifications for the use of electric drive systems;
--- Part 8. Specification of electrical interface voltage.
This part is the sixth part of GB/T 12688.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
The main technical changes in this section compared with GB/T 3886.1-2001 are as follows.
--- Added the terminology and definition of "intermittent load working system with no-load period" (see 2.1.6);
--- Removed "semiconductor converter device", "classification of semiconductor converter", "non-inverter", "one-quadrant converter", "single change"
Current device", "semiconductor converter group", "converter transformer", "common converter transformer", "rated DC current", "rated DC"
Terms and definitions of "pressure" and "rated AC voltage" (2.1~2.2, 2.4~2.6, 2.8~2.10 of GB/T 3886.1-2001,
2.12~2.14);
--- Removed the conditions of use (3.8 of GB/T 3886.1-2001);
--- Removed the test of the thyristor device (Chapter 5 of GB/T 3886.1-2001);
--- Removed Appendix A and Appendix B.
This part uses the translation method equivalent to IEC /T R61800-6.2003 "Speed Control Electric Drive System Part 6. Determining Load Work
Guidelines for Types and Corresponding Current Ratings.
The documents of our country that have a consistent correspondence in the normatively cited international documents in this section are as follows.
---GB/T 3859.1-1993 Specification for basic requirements for semiconductor converters (eqvIEC 60146-1-1.1991);
--- GB/T 12668.1-2002 Speed control electric drive systems - Part 1. General requirements
Regulation of the rating (IEC 61800-1.1997, IDT);
--- GB/T 12668.2-2002 Speed control electric drive systems - Part 2. General requirements
Regulation of the rating (IEC 61800-2.1998, IDT).
This section makes the following editorial changes.
--- The decimal point symbol replaces "," with ".";
--- Remove the preface to the international standard.
This part replaces GB/T 3886.1-2001 "General Requirements for Semiconductor Power Converters for Speed Control Electric Drive Systems
Part 1. Provisions for the rating of DC motor drives.
This part was proposed by China Electrical Equipment Industry Association.
This part is under the jurisdiction of the National Power Electronics Standardization Technical Committee (SAC/TC60).
This section drafted by. Tianjin Electric Drive Design Institute, Siemens Electric Drive Co., Ltd., Beijing ABB Electric Drive System
Company, Emerson Network Power Co., Ltd., Beijing Lide Huafu Electric Technology Co., Ltd., Shandong Xinfengguang Electronic Technology Development Co., Ltd.
Division, Beijing Power Source Technology Co., Ltd., Dongfang Hitachi (Chengdu) Electronic Control Equipment Co., Ltd., Shenzhen Yingweiteng Electric Co., Ltd.
Division, Beijing Jinzi Tianzheng Intelligent Control Co., Ltd., Yaskawa Electric (Shanghai) Co., Ltd., national electronic control power distribution equipment quality supervision and inspection
center.
The main drafters of this section. Zhao Xiangbin, Dong Guimin, Shi Xinli, Wu Fenglin, Wen Xiangning, Meng Hui, Tang Zhong, Yi Peng, Li Ruilai, Liu Ruidong,
Cui Yang, Wu Jianan, Zhou Yaning, Bai Zhiguo, Liu Zhendong.
Speed control electric drive system part 6.
Determine the type of load work and
Guidelines for corresponding current ratings
1 General
1.1 Scope and purpose
This section provides an alternative to the rating of the variable speed electric drive system (PDS), especially its basic drive module (BDM).
Methods.
This section does not cover the speed control drive for traction.
General guidelines for specifying the rated value of low-voltage DC-regulated electric drive systems and the ratings of low-voltage AC variable-frequency electric drive systems
The general guidelines have been given in IEC 61800-1 and IEC 61800-2, respectively.
1.2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
IEC 60146-1-1 General requirements for semiconductor converters and power transformers - Part 1-1. Specification
(Semiconductorconvertors-Generalrequirementsandlinecommutatedconvertors-Part 1-1.Specifi-
Cationsofbasicrequirements)
IEC 61800-1 speed control electric drive systems - Part 1. General requirements
Adjustablespeedelectricalpowerdrivesystems-Part 1.Generalrequirements-Ratingspecifica-
Tionsforlowvoltageadjustablespeedd.c.powerdrivesystems)
IEC 61800-2 speed control electric drive systems - Part 2. General requirements
Adjustablespeedelectricalpowerdrivesystems-Part 2.Generalrequirements-Ratingspecifica-
Tionsforlowvoltageadjustablefrequencya.c.powerdrivesystems)
2 Terms and definitions, symbols
2.1 Terms and definitions
The following terms and definitions as defined by IEC 61800-1, IEC 61800-2 and IEC 60146-1-1 apply to this document.
2.1.1
Equilibrium temperature
The steady state temperature reached by the converter components under specified load and cooling conditions.
Note. In general, the steady-state temperatures of different components vary, and the time required to establish a steady state is also different and proportional to its thermal time constant.
2.1.2
Load current-time graph current-timeloadchart
Recording curve of load current versus time.
2.1.3
Balanced load working system uniformloadduty
This type of load working system is that the time interval between the variable current devices carrying a certain fixed current value is long enough for the components of the converter to reach
The current value corresponds to an equilibrium temperature. Figure 1 is a graphical illustration of this type of load operation (see Table 1 for symbols).
Figure 1 Typical current-time graph of balanced load operation
2.1.4
Intermittent peak load working system intermittentpeakloadduty
This type of load duty is to apply a high amplitude and short duration load immediately after the no-load period, and then successively apply the load.
A thermal balance is reached between. Figure 2 is a graphical illustration of this type of load operation. Intermittent loads do not need to be equally spaced, but manufacturers should
The shortest no-load period t0 required for the semiconductor to reach the no-load temperature before the next load is applied.
Figure 2 Typical current-time graph of intermittent peak load operation
2.1.5
Intermittent load duty
This type of load operation is to superimpose intermittent loads on a constant base load between successive intermittent loads.
Achieve thermal balance. Figure 3 is a graphical illustration of such a load operation. Intermittent loads need not be equally spaced, but the manufacturer should specify the application
The minimum tb required for the semiconductor to reach a steady state temperature before an intermittent load.
Figure 3 Typical current-time graph of intermittent load operation
2.1.6
Intermittent loaddutywithno-loadintervals
This type of load operation is a high-amplitude load period superimposed on a constant base load after an intermittent no-load period, in succession
A thermal equilibrium is reached between the applied intermittent loads. Figure 4 is a graphical illustration of this type of load operation. Intermittent load does not need to be equally spaced
However, the manufacturer should specify the minimum tb required for the semiconductor to reach a steady state temperature before applying the next intermittent load.
Figure 4 Typical current-time graph of intermittent load operation with no-load period
2.1.7
Repetitive load working system repetitiveloadduty
The load of this type of load operation is cyclically changed, and the steady-state temperature is not reached in one cycle, so the base cannot be given.
This load. When the average semiconductor temperature θj from one load cycle to another is no longer changed, thermal equilibrium is reached.
Figure 5 is a graphical illustration of this type of load operation.
Figure 5 Example of current-time graph for repetitive load operation
2.1.8
Non-repetitive load working system non-repetitiveloadduty
This type of load operation applies a peak load at the end of a constant load cycle that reaches thermal equilibrium. Figure 6 is this class
Graphical description of the type of load operation.
Figure 6 Typical current-time graph of a non-repetitive load system
2.1.9
Inverter reversibleconverter
A reversible grid-side converter with a DC power flow direction.
2.1.10
Double converter doubleconverter
DC current is a rigid reversible AC/DC converter in both directions.
A double converter usually consists of two sets of current transformers, one of which flows through a current in one direction.
Note. The converter group can be powered by the common winding of the common transformer, the individual windings of the common transformer or a separate transformer.
2.2 Symbol
See Table 1.
Table 1 List of symbols
t time
Tb basic load period
Ts load cycle (duration)
T0 no load period
Tp peak load duration
Ia converter current
Ib basic load current value
Ip peak load current value
Iv load current minimum
Im load current average of the duty cycle ts
Is load duty cycle ts load current rms
Rated continuous output current of the IaN converter
IdN (current commutated converter) rated DC current
Θj Consider the converter temperature. This temperature is usually considered to be the junction temperature of the semiconductor device.
rN Calculates the coefficient used to estimate the average power loss of the semiconductor junction as a function of the DC current value. Calculated as follows.
rN =Ro×IdNVo
In the formula.
Ro---the resistance value of the on-state characteristic of the semiconductor device;
Vo--the threshold voltage value of the on-state characteristics of semiconductor devices.
3 rating
3.1 General requirements
This chapter's rating definitions apply to complete drive modules (CDM), including those defined in IEC 61800-1 and IEC 61800-2.
Body, switch, reactor and transformer and other similar components.
The basis for the rating of the inverter can be that the converter operates as a rectifier or inverter and should be able to meet the specified requirements in both cases.
All load conditions.
The thermal time constant of a semiconductor (including its cooling device) is much smaller than that of a converter transformer and a drive motor. So in various types of tune
In the normal load operation system of the speed transmission system, the short-term high peak current appears to have a much greater influence on the semiconductor converter itself than on the rheological change.
The influence of the pressure cooker and the motor.
Short-term peak currents tend to cause the temperature rise of the semiconductor to rise faster than the transformer and motor, and relatively higher. But in some cases,
Other components, such as motor windings, may also have the same time constant.
The load duty cycle defined in this section is applied to determine that the basic current is exceeded, or in the case of repetitive load operation.
The short-term overload capability of the root current is simplified and is only used to illustrate the short-term overload capability. But what is important is the side of the actual working cycle.
The root current value does not exceed 100% of the rating of components with long time constants, such as transformers and motors.
The maximum junction temperature specified by the manufacturer for semiconductor devices is the critical temperature. Beyond this temperature, loss of control, malfunction, or deterioration in quality may occur.
The junction temperature cannot be measured directly, but can be calculated for any load current-time graph.
If the user can specify the load current-time graph, the manufacturer can calculate the junction temperature of the semiconductor to ensure that it does not exceed the allowable
The highest junction temperature.
The load current-time graph can always be used as the basis for the specified rating.
This section considers two application categories. one is that the converter load case always reaches equilibrium temperature between the two superimposed loads;
These are cyclically varying load conditions that do not reach thermal equilibrium during the cycle, but can reach an average over several cycles.
The first application category is defined by the following load work type.
a) Balanced load work (Figure 1);
b) intermittent peak load operation (Figure 2);
c) intermittent load working system (Figure 3);
d) intermittent load operation with no-load period (Figure 4);
The second application category is defined by the following load work type.
e) Repetitive load work (Figure 5);
f) Non-repetitive load work (Figure 6).
To avoid confusion, the converter set rating and equipment rating should be carefully distinguished. Therefore, except for the rated continuous output current IaN, all amounts
The settings are only applicable to semiconductor converters including components such as conductors, switches, reactors and transformers. Note. some parts may
Common to more than one converter group, for such components, the rating should be specified in accordance with the converter group. When the rating is based on equipment
This situation does not affect when it is a component.
The rated current is suitable for converter devices and is used as a basis for the standard values applicable to all ratings of the converter group.
3.2 Method for determining the rated current-time value of semiconductor devices and devices
3.2.1 General requirements
For all converters, whether or not they have a transformer, one of the following six load operating systems should be selected.
a) Balanced load work (Figure 1);
b) intermittent peak load operation (Figure 2);
c) intermittent load working system (Figure 3);
d) intermittent load operation with no-load period (Figure 4);
e) Repetitive load work (Figure 5);
f) Non-repetitive load work (Figure 6).
All rated current values are calibrated for the specified load operating system. If the semiconductor device or device is designed to be of different types
For the load working system, the current and time values should be specified separately.
It should be noted that these ratings also apply to equipment used as a complete system for a given application, and are not applicable to any of the systems.
Specific part.
3.2.2 rated current of public converter transformer
A common transformer that supplies two or more converter devices (such as an electric drive system) can be specified according to the rated current, although
Independent converters can be specified on an intermittent basis. Where appropriate, 3.3.2, 3.3.3, 3.3.4, 3.3.5,
The ratings given in 3.3.6 or 3.3.7 are basic.
3.2.3 Rating of double converter
Each of the converter sets in the semiconductor dual converter unit can be specified with different ratings unless the operating system of each converter group is the same.
The rating of each converter group shall be compatible with 3.3.2, 3.3.3, 3.3.4, 3.3.5, 3.3.6 or 3.3.7.
3.2.4 Determination of the type of load working system
Load current-time graphs for variable speed drive applications are often complex, and current amplitude, duration, and repetition frequency are also
Not the same. However, by analyzing the load current-time graph, it is usually used to determine the most suitable load as the basis for the rated current.
Type of work.
If the load work pattern changes, the impact of this change on all parts of the system should be checked. There may also be a need for control and protection elements
Make adjustments.
3.3 Equipment and current rating of the converter group
3.3.1 General requirements
All current ratings are valid for the entire specified speed range under specified environmental conditions (maximum temperature, altitude).
3.3.2 rated current of uniform load working system
The basic load current value for this type of operation is usually specified as the rated continuous output current (Ib = IaN).
Other basic values are determined by the vendor and the user.
See 2.1.3 and Figure 1.
3.3.3 rated current of intermittent peak load working system
For this condition, the rated current is not applicable. The current rating of the intermittent peak load operation is determined by the supplier and the user.
The duration (tp) and amplitude (Ip) of the peak current and the minimum dead time (t0) before the peak current can be reapplied should be determined by the manufacturer.
Provisions.
See 2.1.4 and Figure 2.
3.3.4 rated current of intermittent load working system
The basic load current value of this type of operation is usually specified as the rated current (Ib = IaN). The current rating of the intermittent load system is provided by
The supplier and the user negotiated to determine.
The peak current duration (tp) and amplitude (Ip), the base load current value (Ib), and the basic negative before the peak current can be reapplied
The minimum time (tb) of the load operation shall be specified by the manufacturer. When selecting a semiconductor, it must be guaranteed at peak current (Ip) and its longest duration
Within the time (tp), the maximum allowable junction temperature is not exceeded. See 2.1.5 and Figure 3.
The intermittent load operation can be specified by the curve family of the non-repetitive load operation shown in Fig. 8. Among them, tp indicates that under such conditions,
The duration of the application of the load.
3.3.5 rated current of intermittent load working system with no-load period
The basic load current value of this type of operation is usually specified as the rated current (Ib = IaN). The current rating of the intermittent load system is provided by
The supplier and the user negotiated to determine.
Peak current duration (tp) and amplitude (Ip), base load current value (Ib) and minimum time to run at base load (tb) and
The minimum no-load period (t0) before the peak current can be reapplied should be specified by the manufacturer. When selecting a semiconductor, it must be guaranteed at the peak current
Within (Ip) and its longest duration (tp), the maximum allowable junction temperature is not exceeded. See 2.1.6 and Figure 4.
3.3.6 rated current of repetitive load working system
3.3.6.1 General requirements
The rms value of the load current estimated by the duty cycle of the load shall not exceed the rated current IaN of the converter. Converter rating
The current IaN is typically equivalent to the rated continuous current of the motor (one or more) powered by the converter device.
The rated current (1.0 pu) is related to the converter device. In the case of a double converter, the rated current can greatly exceed any one of the converters
The square root current rating of the group. See 2.1.7 and Figure 5.
For repetitive load operation, there are two other methods of defining the rating in addition to the specified rated current. The first method is at
Given in 3.3.6.2, the second method is given in 3.3.6.3.
3.3.6.2 Load-time graph of repetitive load working system
If possible, the user shall specify the repeatability requirements of the converter based on one or more applicable current-time graphs.
Get the most economical design. These current-time graphs can then be used as part of the specification between the user and the supplier. And things
In fact, for a repetitive load duty cycle for a given application, these current-time graphs are the current rating of the converter group. In all situations
The amplitude and duration of each current and the duration of the load duty cycle (ts) should be specified.
Note. As far as the load-time curve is concerned, there is no need to consider abnormal conditions, because the converter design can provide sufficient protection for such conditions.
3.3.6.3 Repetitive load working system equivalent rating method
This method can be used in situations where there is no detailed load-time graph. This method can also be used to define a simple repetitive load.
The working system produces thermal stresses that are comparable to more complex repetitive load operating systems. Users only need to follow the rules defined in Figure 5 and Table 1.
The Ip, Is, Im, Iv, and ts values of the constant current group can be determined. Therefore, the prescribed basis of the rating is changed to the equivalent repetitive load-time shown in Figure 7.
In the graph, the Ip, Iv, and ts values in the figure are specified values, and the equivalent tp is given by.
Tp=Pm-PvPp-Pv×
Ts
In the formula.
Pm---the semiconductor power consumption associated with the specified load (Is and Im);
Pp---the semiconductor power consumption associated with peak load (Ip);
Pv---Semiconductor power consumption associated with minimum load (Iv).
For grid commutated converters, in the case of ignoring switching losses, the above relationship becomes.
Tp=
(Im-Iv) × IdN rN × (Is2 - Iv2 )
(Ip-Iv) × IdN rN × (Ip2 - Iv2 ) ×
Ts
Wherein, Ip, Is, Im, Iv, and ts correspond to prescribed values, and rN is a semiconductor loss factor associated with IdN defined in Table 1.
The converter supplier usually specifies the maximum value of Ip and tp allowed for the current limit setting of the converter regulator and is usually
The maximum value of Is should be at IaN. These limits are more important than the limits imposed by the equivalent repetitive load duty rating.
Figure 7 equivalent repetitive load working load-time curve
3.3.7 Rated current of non-repetitive load working system
The rated current of this working system is usually specified as the basic load current value Ib. Non-repetitive load ratings by suppliers and users
Negotiated and determined (see 2.1.8 and Figure 6).
The manufacturer applies the non-repetitive electricity of the family of curves (Ip, Ib) shown in Figure 8 with different peak load duration tp values as parametric variables.
Flow rating. It is often possible to define an equivalent non-repetitive load work regime for other types of load work. For example, such as
As stated in 3.3.4, for intermittent load operation, the equivalent is one-to-one.
If the values of Ip and tp used in non-repetitive conditions are the same as those specified for repetitive conditions, and equivalent to non-repetitive conditions
The Ib value is obtained by the following equation, so the equivalent non-repetitive load working system can also be conservatively approximated as a repetitive load working system.
Pb=Pm
In the formula.
Pm--the semiconductor power consumption associated with the specified load (Is and Im) of the repetitive working system;
Pb---the semiconductor power consumption associated with the equivalent base load (Ib).
For example, fo...
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