JB/T 5555-2013 PDF English
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JB/T 5555-2013: PDF in English (JBT 5555-2013) JB/T 5555-2013
JB
MECHANICAL INDUSTRY STANDARD
ICS 29.180
K 41
Filing No.. 40539-2013
Replacing JB/T 5555-2001
Transformers for machine tools
ISSUED ON. APRIL 25, 2013
IMPLEMENTED ON. SEPTEMBER 01, 2013
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 3
Introduction... 4
1 Scope... 5
2 Normative references... 5
3 Terms and definitions, symbols... 6
3.1 Terms and definitions... 6
3.2 Symbols... 7
4 Classification... 7
5 Characteristics... 7
5.1 Structural type... 7
5.2 Specifications and parameters... 8
5.3 Overall dimensions and installation dimensions... 8
6 Product related information... 9
6.1 Information content... 9
6.2 Marking... 9
6.3 Installation, operation, maintenance instructions... 9
6.4 Packaging... 10
7 Normal use, installation, transportation conditions... 11
7.1 Normal use conditions... 11
7.2 Installation conditions... 11
7.3 Transportation and storage conditions... 12
8 Structural and performance requirements... 12
8.1 Structural requirements... 12
8.2 Performance requirements... 15
9 Tests... 18
9.1 Classification of tests... 18
9.2 Verification of structural requirements... 21
9.3 Verification performance requirements... 22
Transformers for machine tools
1 Scope
This standard specifies the terms and definitions, symbols, classifications,
characteristics, relevant product information, normal use, installation and transportation
conditions, structural and performance requirements and tests of control transformers
for machine tools (hereinafter referred to as transformers).
This standard applies to single-phase control transformers.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 2900.1 Electrotechnical terminology - Fundamental terms
GB/T 2900.15 Electrotechnical terminology - Transformer, instrument transformer,
voltage regulator and reactor
GB/T 5169.10-2006 Fire hazard testing for electric and electronic products - Part 10.
Glowing/hot-wire based test methods - Glow-wire apparatus and common test
procedure
GB/T 5169.11-2006 Fire hazard testing for electric and electronic products - Part 11.
Glowing/hot-wire based test methods - Glow-wire flammability test method for end-
products
GB 5226.1-2008 Electrical safety of machinery - Electrical equipment of machines
- Part 1.General requirements
GB/T 13384 General specifications for packing of mechanical and electrical product
GB 14048.1-2006 Low-voltage switchgear and controlgear - Part 1.General rules
3 Terms and definitions, symbols
3.1 Terms and definitions
The terms and definitions as defined in GB/T 2900.1, GB/T 2900.15, GB 14048.1-2006,
as well as the following terms and definitions, apply to this document.
3.1.1
Transformers for machine tools
Transformers with two or more electrically isolated windings, used as power
supplies for control circuits, lighting circuits, signal circuits, electronic equipment
in the electrical systems of machine tools and other mechanical equipment.
3.1.2
Rated supply voltage
The nominal voltage applied to the input terminal of the transformer, under normal
operating conditions.
3.1.3
Rated output voltage
The nominal value of the transformer output voltage, under normal operating
conditions.
3.1.4
Rated output power
The rated output power is equal to the product of the rated output voltage multiplied
by the rated output current of the transformer. When the transformer has multiple
independent output windings, the rated output power is equal to the sum of the
products of the rated voltage of each output winding multiplied by the rated current
of the winding.
3.1.5
No-load output voltage
The output voltage when no-load at rated supply voltage and rated frequency.
3.1.6
Load output voltage
The output voltage, when rated power is output at rated supply voltage and rated
frequency.
3.1.7
Output voltage of instantaneous power
The output voltage, when instantaneous power is output at rated supply voltage and
rated frequency.
3.2 Symbols
The main symbols specified in this document are as follows.
Ue - Rated supply voltage;
UH - Rated output voltage;
Ui - Rated insulation voltage;
Uk - No-load output voltage;
Um - Load output voltage;
UmΦ - Output voltage of instantaneous power.
4 Classification
4.1 According to the structure, it can be divided into shell type and core type.
4.2 According to the installation type, it can be divided into vertical type and horizontal
type.
5 Characteristics
5.1 Structural type
The transformer is generally an open structure; it can also be made into a shell structure
if necessary.
6 Product related information
6.1 Information content
The manufacturer shall specify the following related information.
a) Manufacturer name or trademark;
b) Product model and (or) name;
c) Standard number that the product complies with;
d) Year and month of manufacture;
e) Rated output power, rated supply voltage, rated output voltage (see 5.2.2.1);
f) Rated frequency (see 5.2.2.2);
g) Rated capacity of each output winding (if applicable);
h) Rated insulation voltage (see 5.2.2.3);
i) IP rating (if applicable) (see 8.1.6);
j) Pollution level (see 7.1.3.2);
k) Conformity mark and certification mark (if applicable).
6.2 Marking
6.1 The information content of items a) ~ g) shall be marked on the nameplate of the
transformer, so that complete information can be obtained from the manufacturer. The
markings shall be clear, indelible, easily identifiable, which shall not be marked on
screws and movable parts. If the location permits, the parameters of items h) ~ k) may
also be marked on the nameplate or transformer, or included in the documents published
by the manufacturer.
6.3 Installation, operation, maintenance instructions
The manufacturer shall specify the installation, operation, maintenance conditions of
the transformer during operation and after a fault, in its documents (such as the
instruction manual) or samples (if any).
If necessary, the transportation, installation, operation instructions of the transformer
shall specify the appropriate and correct installation, transportation, operation methods
of the transformer.
The manufacturer shall provide instructions, to recommend what measures the user
shall take to prevent short circuits.
6.4 Packaging
6.4.1 Packaging box (inner packaging)
The packaging box shall be accompanied by a product certificate; the packaging box
marking shall include the following.
a) Manufacturer name or trademark;
b) Product model and name and year and month of manufacture;
c) Rated output power, rated supply voltage, rated output voltage, rated frequency.
6.4.2 Packing box (outer packaging)
The transformer packaging box shall be sturdy, moisture-proof, dust-proof, which is
suitable for transportation. The box shall contain a packing list, product instructions,
etc. The gross weight of each box shall not exceed 50 kg. The outer wall of the
packaging box shall have obvious and durable markings, indicating the following
information.
a) Manufacturer name, address or trademark;
b) Product model and name;
c) Product number;
d) "Length × width × height" dimensions and gross weight of the packaging box;
e) Name and address of the consignee;
f) Markings such as "Fragile items", "Avoid rain", "Keep upward", "Packing year
and month" or other words or signs.
Other requirements shall also comply with the provisions of GB/T 13384.
The installation category of the transformer is specified as "Installation category III".
7.2.2 Installation direction
The transformer can be installed in any direction.
7.2.3 Installation method
The transformer is fixed with screws.
Note. The requirements of other installation methods are negotiated by the manufacturer and
the user.
7.3 Transportation and storage conditions
If the transportation and storage conditions of the transformer, such as temperature and
humidity, are different from those specified in 7.1, the manufacturer and the user shall
reach a special agreement. Unless otherwise specified, the following temperature range
applies to transportation and storage. within -25 °C ~ 55 °C, up to 70 °C for a short time
(24 h).
8 Structural and performance requirements
8.1 Structural requirements
8.1.1 General requirements
The transformer shall be designed to withstand the stress generated during
transportation, installation, normal use; meanwhile meet the requirements of relevant
tests.
8.1.2 Materials
The insulating material parts of the transformer shall be resistant to abnormal heat and
fire. The verification test may be carried out in the following appropriate ways.
a) On the transformer;
b) On the parts of the transformer;
c) On the test piece of the same material with appropriate cross-sectional area.
If the same material with the same cross-sectional area has met the test requirements
specified in 9.2.1, it is not necessary to repeat the test.
7.1.7.4 of GB 14048.1-2006 applies.
8.1.5 Protective grounding requirements
8.1.5.1 Structural requirements
7.1.9.1 of GB 14048.1-2006 applies.
8.1.5.2 Protective grounding terminal
7.1.9.2 of GB 14048.1-2006 is applicable. The following content is supplemented.
a) The protective grounding terminal of the transformer shall have measures to
prevent loosening and shall not be used for other fastening purposes;
b) The body of the protective grounding terminal shall use screws or parts with the
same function as screw connection; have appropriate anti-corrosion measures.
There shall be a clear protective grounding mark near the protective grounding
terminal;
c) The minimum diameter of the grounding screw is M4.
8.1.5.3 Marking and identification of protective grounding terminals
7.1.9.3 of GB 14048.1-2006 is applicable.
8.1.6 Degree of protection by shells
The transformer shell (if any) shall be designed according to the location and
environmental conditions of the transformer installation site; its degree of protection
shall comply with the provisions of 6.2.2 of GB 5226.1-2008.
8.1.7 Moisture resistance
The transformer shall be able to withstand the alternating damp heat test, at a high
temperature of 40 °C and a test cycle of 6 days and nights.
8.1.8 Component quality
The metal parts of the transformer shall have reliable anti-rust protection measures.
The surface of the plastic parts of the transformer shall be smooth; there shall be no
clamping, cracking, bubbles, pitting, serious scratches.
The electroplated parts of the transformer shall not have plating shedding.
8.1.9 Assembly quality
The connecting screws of the transformer shall be tightened without loosening;
c) Mechanical properties test of terminal blocks (see 9.2.3);
d) Protective earth terminal inspection (see 8.1.5);
e) Test of degree of protection by shell (if applicable) (see 9.2.4);
f) Moisture resistance test (see 9.2.5);
g) Dielectric properties test (see 9.3.3);
h) Induction withstand voltage test (see 9.3.4);
i) Temperature rise test (see 9.3.5);
j) No-load loss test (see 9.3.6);
k) No-load output voltage test (see 9.3.7);
l) Load output voltage test (see 9.3.8);
m) Output voltage test under instantaneous power conditions (if applicable) (see
9.3.9);
n) Other tests (including inspection of external dimensions and installation
dimensions, markings, component quality, assembly quality, etc.) (see 5.3, 6.2,
8.1.8, 8.1.9).
The transformer for type test shall be a formal trial-produced sample. Each test item
shall be no less than two products. All specified type test items shall be qualified, before
the transformer type test is considered qualified. If one item of a product is unqualified,
it is allowed to double the number of original test products for retest. If all items are
qualified in the retest, the type test can still be considered qualified. If another item of
a product is unqualified, it shall analyze the cause and take technical measures to re-
test the item, until the test is qualified. Products that pass the type test can be submitted
for identification.
9.1.3 Routine test
Routine test is a test conducted on each transformer during or after the assembly of the
product. The purpose is to check for defects in materials, processes, assembly. The test
is allowed to be carried out using a fast equivalent method.
Routine tests include the following items.
a) Dielectric performance test (see 9.3.3);
b) No-load loss test (see 9.3.6);
The efficiency test (see 9.3.10) is a special test for transformers.
9.2 Verification of structural requirements
9.2.1 Abnormal heat and fire resistance test
9.2.1.1 Glow wire test (performed on transformer)
The abnormal heat and fire resistance test of insulating material parts adopts the glow
wire test method and is carried out in accordance with the provisions of GB/T 5169.10-
2006 and GB/T 5169.11-2006.
a) Insulating material parts used for fixed current-carrying parts shall adopt a glow
wire top temperature of 960 °C ± 15 °C, for a duration of 30 s ± 1 s, two pieces
of each type;
b) Insulating material parts used for non-fixed current-carrying parts shall adopt a
glow wire top temperature of 650 °C ± 10 °C, for a duration of 30 s ± 1 s, two
pieces of each type;
c) The test results shall be determined in accordance with the requirements of GB/T
5169.10-2006 and GB/T 5169.11-2006.
9.2.1.2 Flame test, heating wire ignition test and arc ignition test (performed on
materials)
8.2.1.1.2 of GB 14048.1-2006 is applicable.
9.2.2 Measurement of electrical clearance and creepage distance
Appendix G of GB 14048.1-2006 is applicable.
9.2.3 Mechanical property test of terminal blocks
The mechanical property test of transformer's terminal blocks shall be carried out in
accordance with 8.2.4 of GB 14048.1-2006.
9.2.4 Test of degree of protection by shell
Appendix C of GB 14048.1-2006 is applicable.
9.2.5 Moisture resistance test
Appendix K of GB 14048.1-2006 is applicable, supplemented by the following.
The insulation resistance after the test shall not be less than that specified in Table 11.
According to the agreement between the manufacturer and the user, a transformer with
a rated frequency of 60 Hz can be tested under 50 Hz conditions; the validity of the test
shall be confirmed according to the content of the agreement.
9.3.3 Dielectric performance test
The dielectric performance test of the transformer shall be carried out on a clean and
dry product. At the power frequency withstand voltage test's voltage value specified in
Table 4, the type test lasts for 5 s; the routine test can be shortened to 1 s; there shall be
no breakdown or flashover during the test; the leakage current shall not be greater than
100 mA.
The voltage of power frequency withstand voltage test is applied at.
- Between the input winding and the output winding;
- Between the input winding, the output winding and the core;
- Between the output windings.
If the transformer has passed the dielectric performance test as required, when the
withstand voltage test is repeated afterwards, the test voltage shall be reduced to 85%
of the original test voltage value.
9.3.4 Induction withstand voltage test
Any winding of the transformer is applied with twice the rated voltage and twice the
rated frequency of the winding, whilst the other windings are open-circuited for 5
minutes. If a higher frequency is used, it shall not be less than 2 minutes. The inter-turn
insulation shall not be broken down.
9.3.5 Temperature rise test
The input winding of the transformer is at the rated supply voltage and rated frequency;
the output winding is connected to the rated load with a power factor of cosφ = 1.The
test circuit is as shown in Figure 1.After the transformer reaches thermal stability, the
temperature rise of each component of the transformer is measured, which shall meet
the requirements of 8.2.3.The test is carried out in accordance with the provisions of
8.3.3.3 of GB 14048.1-2006.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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