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JB/T 9646-1999 English PDF (JBT9646-1999)

JB/T 9646-1999 English PDF (JBT9646-1999)

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JB/T 9646-1999: Small dry-type transformer for control or luminary

This Standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of small dry-type transformers for control or lighting.
JB/T 9646-1999
K 41
Replacing ZB K43 003-1988
Small dry-type transformers for control or lighting
Issued by. National Administration of Machinery Industry
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Definitions ... 5
4 Product classification ... 8
5 General technical requirements ... 9
6 Test methods ... 18
7 Inspection rules ... 22
8 Marking, packaging, transportation and storage ... 24
This Standard is an amendment of ZB K43 000-88 Small dry-type transformers for control or lighting.
This Standard was amended as follows.
1 This Standard was drafted in strict accordance with GB/T 1.1-1993.
2 The composition of the product model was amended, canceling the
representation methods of standard codes and sequence numbers,
complemented with the code of the environment for special use.
3 The normative references were validated in accordance with the current standards, with the content in the standard text amended accordingly.
This Standard shall replace ZB K43 003-88 as of the date of implementation. This Standard was proposed by and shall be under the jurisdiction of the National Technical Committee for Standardization of Transformers.
Drafting organizations of this Standard. Shenyang Transformer Research
Institute, Harbin Explosion-proof Electric Apparatus Factory.
Drafters of this Standard. Lin Ran, Zhang Hongbin, Wang Zhaoping, Xu Jingyi. This Standard was first formulated in 1988; first amended in 1998.
Small dry-type transformers for control or lighting
1 Scope
This Standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of small dry-type transformers for control or lighting.
This Standard is applicable to the air self-cooling, fixed or mobile, built-in or other types of, single-phase or multi-phase small dry-type transformers for control or lighting (hereinafter referred to as transformers), with a rated supply voltage of not exceeding 1 000V, a rated frequency of 50Hz and an unlimited rated output capacity. For isolation transformers or electric power transformers, unless otherwise specified, this Standard shall also be used in reference. This Standard is not applicable to the mining flameproof dry-type transformers, liquid dielectric transformers and powdered material transformers.
2 Normative references
The provisions in the following standards become the provisions of this Standard through reference in this Standard. At the time of publication of this Standard, the editions shown are valid. All standards will be amended and the parties using this Standard shall explore the possibility of using the latest editions of the following standards.
GB 1094.1-1996 Power transformers - Part 1. General (eqv IEC 600 76-
GB/T 2423.16-1990 Basic environmental testing procedures for electric and electronic products - Test J. Mould growth
GB/T 2423.17-1993 Basic environmental testing procedures for electric and electronic products - Test Ka. Salt mist
GB/T 2828-1987 Sampling procedures and tables for lot-by-lot inspection by attributes
GB/T 2900.1-1992 Electrotechnical terminology - Fundamental terms
GB/T 2900.15-1997 Electrotechnical terminology - Transformer, instrument transformer, voltage regulator and reactor [neq IEC 600 50(421).1990, IEC 600 50(321).1986]
3.15 Double insulation
Basic insulation and additional insulation are available at the same time. 3.16 Reinforced insulation
Insulation system on a live part, whose degree of protection against electric shock is equivalent to double insulation.
The insulation system is an insulation consisting of one or more materials, which may be composed of several layers of material, and cannot be
individually tested for insulation, as is the case with basic insulation or additional insulation.
3.17 Mobile transformer
A transformer that is able to be moved during operation, or moved from one place to another easily when connected to a power source.
3.18 Fixed transformer
A transformer that is permanently installed in operation, which is not easily moved from one place to another.
3.19 Housing
The protective body of the transformer is called housing, including all accessible metal parts such as axles, handles, knobs, operating levers, metal fastening screws, metal foils affixed to the surface of insulating materials, and other similar structural members, but not including inaccessible metal parts. 3.20 Rated ambient temperature
Under normal operating conditions, the maximum ambient temperature, code- named ta, at which a transformer is able to run continuously.
Specified rated ambient temperature does not rule out the condition that a transformer is able to make short-term operation at an ambient temperature not exceeding ta + 10??C.
3.21 Electric clearance
The minimum air gap between exposed live parts, or between an exposed live part and other metal parts.
3.22 Creepage distance
c) Insulation that meets the requirements must be used for separation
between the input windings and the output windings; MAKE sure that there is no electrical connection between them on the insulation structure.
5.6.2 Short-circuit and overload protection
During normal operation, protective devices (such as fuses, thermal releases, etc.) may be provided to ensure the safety of the transformer in the event of a short circuit or overload. Such devices shall be able to function reliably under the specified capacity limits.
5.6.3 Structure
a) The transformer structure must meet all the specified requirements of mechanical strength and electromagnetic properties, etc., and shall meet the specified requirements for heat resistance, moisture resistance and water resistance;
b) Flammable materials (such as celluloid, etc.) are not allowed to be used as the structural materials of the transformer;
c) In the transformer structure, the fastener connection and the connection between terminals and wires in use shall take reliable measures to prevent loosening;
d) In addition to those with special requirements, the lighting transformer shall be equipped with a protective housing; the protective housing is optional for the control transformer.
Unless otherwise specified (e.g. lighting transformers for machine tools), IP11 level specified in GB 4208 shall apply to the protective housing.
5.6.4 Components
a) In addition to the relevant articles in this Standard, transformer components such as switches, plug fuses, flexible wires, flexible cables and similar components shall also comply with the requirements of the corresponding standards.
In general, the long-term operating current of fuses shall be 1.1 times the rated current.
b) Thermal releases, overload releasers and other protective devices shall have sufficient breaking capacity.
The thermal releases, which use the soldering method for positioning, shall not be used for overload protection.
Overload protective devices shall not make actions when the power is
switched on.
specified in Table 11, inspections shall be carried out according to the requirements of the standards related to the complete set.
6 Test methods
6.1 General test requirements
6.1.1 The test shall be generally carried out at room temperature.
6.1.2 The AC voltage applied during the test shall be an approximate
sinusoidal waveform.
6.1.3 In the event that the transformer under test is able to function at more than one rated supply voltage, unless otherwise specified, a supply voltage that enables the test object to be subjected to the harshest conditions shall be se...

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