Parameter rating and test requirements of the hott

2022-09-22
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Parameter rating and test requirements of low-voltage frequency converters

the National Technical Committee for standardization of semiconductor power converters in speed regulation electrical drive systems of power electronics was established in 2000 under the situation of the rapid development of speed regulation products of electrical drives at home and abroad. The Secretariat is attached to Tianjin electric drive design and Research Institute, which is responsible for the organization and centralized management of standardization technical work in the technical field of national electric drive speed regulation systems, The products involved are mainly DC electric drive equipment driven by the demand for new energy vehicles in the basic industrial AC of the national economy. Six national and industrial standards for electric drive speed regulation systems have been formulated: gb/t3886 JB/T、GB/T12668.、 GB/T12668.、 GB12668.、GB/T12668.4。

in order to improve the quality control of the whole process of the product, some supporting standards, such as the test method of the speed regulating device, the environmental conditions regulations of the speed regulating device, the technical conditions of the speed regulating device, the acceptance regulations of the speed regulating device, and the safety regulations of the speed regulating device, will be formulated and gradually implemented during the year

at present, everyone pays great attention to the national compulsory product certification (3C certification), which is based on national standards and technical rules. The catalogue of the first batch of compulsory product certification issued by the state includes 19 categories and 132 products. Laboratory construction, planning and other related services. The mechanical part is guaranteed for free for two years. Although the electric drive speed regulation products are not within the scope of the first batch of catalogue, in order to speed up the publicity and implementation of the standard and the preparation of 3C certification, this standard introduction is the first part of the serial column to communicate with you

1. The scope of application of gb/t12668.2 standard

"gb/t12668. variable speed electrical drive systems Part 2: General requirements: the pipeline of the lubrication system leads to each rotating joint and moving part - Provisions on the rating of low-voltage AC variable frequency electrical drive systems" is applicable to AC variable speed drive systems for general purposes (see figure 1), The system is composed of power equipment (including converter part, AC motor and other equipment, but not limited to feeding part) and control equipment (including switch control - such as on/off control, voltage, frequency or current control, triggering system, protection, status monitoring, communication, testing, diagnosis, production process interface/port, etc.). This standard is not applicable to traction transmission and electric vehicle transmission; It is suitable for connecting electric drive systems with AC power supply voltage below 1kV, 50Hz or 60Hz, and load side frequency up to 600 Hz. This standard gives the requirements for the rated value, normal use conditions, overload conditions, surge withstand capacity, stability, protection, AC power grounding and test of the frequency converter

this paper introduces the parameter rating and test requirements of relevant low-voltage frequency converters

2. Functional characteristics of frequency converter

frequency converter should have some specified characteristics, which can include (but not limited to) one or more of the following:

-- timing acceleration

-- timing deceleration

-- inching

-- adjustable current limiting

-- energy consumption braking

-- reverse

-- regeneration (braking)

-- electric filtering

-- input/output data processing (analog/digital)

-- automatic restart

- (torque) lifting

-- DC braking

-- precharge circuit

the frequency converter shall be equipped with specified fault indication, which can be composed of common alarm and/or trip signals provided by dry-type relay or solid-state relay. Fault indication usually acts due to one or more faults, including (but not limited to) the following:

-- external faults

-- partial failure of output power

-- instantaneous overcurrent

-- overheating (converter)

-- no cooling air

-- motor overload

-- auxiliary power failure

-- overvoltage/undervoltage of power supply

-- phase failure of power supply

-- internal control system failure

-- regulator/power circuit diagnosis

the frequency converter shall have the status indication signal of "transmission input" (whether rotating or stopping); It can also have a status indication signal of "transmission ready"

3. Operating conditions of frequency converter

3.1 electrical operating conditions

frequency change, voltage change, voltage imbalance, power impedance, power harmonic and some abnormal conditions should be considered: for example, the frequency is FLN ± 2%; The variation limit of rated input voltage is ± 10%; It shall be able to operate when the imbalance of power supply voltage does not exceed 3% of the rated input voltage of fundamental wave (uln1)

3.2 environmental service conditions

mainly include climatic conditions and mechanical installation conditions: such as ambient temperature +5 ° C ~ +40 ° C; The frequency converter shall be installed on a solid base indoors, and it will not cause serious impact on the ventilation or cooling system in its installation area or in the additional enclosure. Abnormal environmental service conditions, such as exposure to excessive dust, altitude of 1000 m, require specially selected structures or protective components

3.3 storage of frequency converter

if the transportation packing box is not suitable for outdoor or unprotected storage, the frequency converter should be placed in a place that can meet the storage requirements immediately after receiving it

the frequency converter shall be stored away from rain, snow, freezing rain, corrosive materials, etc., and shall not be stored at a place above 3000m above sea level, and the total storage time shall not exceed 6 months

3.4 frequency converter transportation

the frequency converter should be able to be transported in the supplier's standard packaging box, and the ambient temperature: -25 ° C ~ +70 ° C. Under abnormal climatic conditions, if the transportation temperature is lower than -25 ° C, heating transportation or other methods should be used. The impact and vibration environment shall not exceed the specified limits

4. Rated value of frequency converter

4.1 input rated value

-- voltage; The manufacturer shall specify the input rating of the frequency converter, and the preferred value is:

a) 100110200220230240380400415440500660690v, for 50Hz

b) 1001151202002082023024040400440460480575600v, for 60Hz

-- IVN value of rated input current

-- frequency

-- number of phases

-- minimum power impedance (or maximum expected short-circuit current) and maximum electricity "although wood plastic composite technology originated from American source impedance.

4.2 output rating

-- Maximum

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