This standard specifies the technical requirements, inspection rules, test methods, marking, packaging, transportation and storage of arc furnace transformers. This standard applies to three-phase oil-immersed arc furnace transformers for steelmaking arc furnaces with a rated frequency of 50Hz, a voltage level of 110kV and below, and a rated capacity of 80000kV and below. JB/T 9640-1999 Arc Furnace Transformer JB/T9640-1999 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 9640 - 1999
Arc Furnace Transformer
1999-08-06 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB/T9640-1999
This standard is a revision of ZBK41002--87 "Arc Furnace Transformer". This standard is based on GB1094.1~1094.2-1996, GB1094.3--1985, GB1094.5--1985 "Power Transformer". According to the characteristics of arc furnace transformers, the above standards are fully cited. This standard mainly revised the original standard in the following aspects: 1. The typical connection diagram was re-compiled, and the connection diagram of the arc furnace transformer with an operating circuit breaker in the intermediate circuit and the arc furnace transformer with autotransformer voltage regulation was added.
2 The product test items were clearly listed, and the test items such as the sealing test of the oil tank and oil storage cabinet, the mechanical strength test and the short-circuit impedance measurement were classified and specified.
3 The short-circuit impedance deviation was changed from ±15% to ±10%. 4 The nameplate marking items were adjusted.
5 Due to the differences in transformer voltage regulation methods and product structures of various manufacturers, the losses and loss ratios of transformers are also very different. Therefore, this revision removes the losses from the standard text, and the manufacturer and the user negotiate to determine or refer to Appendix B (suggestive Appendix). From the date of implementation, this standard will replace ZBK41002-87 at the same time. Appendix A of this standard is the standard appendix, and Appendix B is the suggestive appendix. This standard is proposed and managed by the National Technical Committee for Transformer Standardization. The main drafting units of this standard are Changchun Transformer Factory, Xi'an Transformer Factory, and Shenyang Transformer Research Institute. The main drafters of this standard are Zhang Maolu, Fang Zhiqiang, Lin Ran, and Zhang Haoping. This standard was first issued in 1977, with the standard number JB2105-77; the first revision was in 1987, with the standard number ZBK41002--87; the second revision was in 1998.
This standard is entrusted to Shenyang Transformer Research Institute for interpretation. I
1 Scope
Machinery Industry Standard of the People's Republic of China
Arc Furnace Transformer
JB/T 9640-1999
Replaces ZBK41002-1987
This standard specifies the technical requirements, inspection rules, test methods, marking, packaging, transportation and storage of arc furnace transformers. This standard applies to three-phase oil-immersed electric arc furnace transformers for steelmaking electric arc furnaces with a rated frequency of 50Hz, a voltage level of 110kV and below, and a rated capacity of 80000kVΛ and below. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191—1990
GB311.1—1997
GB1094.1—1996
GB1094.2—1996
GB1094.3—1985
GB1094.5—1985
GB/T2900.1-—1992
Packaging, storage and transportation pictorial symbols
Insulation coordination of high-voltage power transmission and transformation equipment ( nepIEC60071-1:1993) Power transformer
Part 1: General (eqvIEC60076.1:1993) Power transformer
Part 2: Temperature rise (eqvIEC60076.2:1993) Power transformer
Power transformer
Electrical terms
GB/T2900.15—1997
Electrical terms
Part Part 3: Insulation levels and insulation tests (nepIEC60076.3: 1980) Part 5: Ability to withstand short circuits (nepIEC60076.5; 1976) Basic terms
Transformers, transformers, voltage regulators and reactors (ncqIEC60050 (421): 1990, IEC60050 (321): 1980) GB/T6451-1995
JB/T501-1 991
JB/T3837—1996
JB5346—1998
3 Terms
Technical parameters and requirements of three-phase oil-immersed power transformers Test guide for power transformers
Model compilation method for transformer products
Series reactor
The terms and definitions in this standard shall be in accordance with the provisions of GB/T2900.1, GB/T2900.15 and GB1094.1. 4 Product model
The product model of arc furnace transformers shall be compiled in accordance with the provisions of JB/T3837. 5 Technical requirements
Use conditions
The use conditions of arc furnace transformers shall comply with the provisions of indoor transformers in GB1094.1. 5.2 Specifications and Parameters
5.2.1 Arc furnace transformers can be divided into on-load voltage-regulating arc furnace transformers and off-excitation voltage-regulating arc furnace transformers according to the voltage regulation method. On-load voltage-regulating arc furnace transformers do not have series reactors. Off-excitation voltage-regulating arc furnace transformers are divided into two types in structure: with series reactors and without series reactors. Both structures can change impedance at the highest secondary voltage. The former changes impedance by switching on and off the series reactor, while the latter changes impedance by changing the connection method of the high-voltage winding. The typical connection method of arc furnace transformers is shown in Appendix A (Standard Appendix). 5.2.2
The specifications and parameters of off-excitation voltage-regulating arc furnace transformers with series reactors shall comply with the provisions of Table 1. Table 1
Rated capacity
Secondary voltage
Secondary voltage
220190
139121
Rated secondary
Connection group
D(Y)do(d11)
Short-circuit impedance
Reactor
Rated capacity
Reactor voltage drop
Rated capacity refers to the capacity at the highest secondary voltage. At other secondary voltages, its capacity decreases proportionally with the secondary voltage (constant current output). Short-circuit impedance refers to the value at the highest secondary voltage. The cooling method can be ONAN, OFWF or OFAF. The series reactor can be internal or external.
The specifications of the non-excitation voltage-regulating arc furnace transformer without series reactor shall comply with the provisions of Table 2. Table 2
Rated capacity
Primary voltage level
Secondary voltage
220190
127110
Rated secondary current
Connection group number
D(Y)do(d11)
Short circuit resistance
Large impedance
Small impedance
Rated capacity refers to the capacity at the highest secondary voltage. At other secondary voltages, its capacity decreases proportionally with the secondary voltage (constant current output). Short circuit resistance refers to the value at the highest secondary voltage. The cooling method can be ONAN, (FWF or OFAF5.2.4wwW.bzxz.Net
JB/T9640-1999
The specifications of the on-load voltage-adjusting arc furnace transformer shall comply with the provisions of Table 3. Table 3
Rated capacity
Primary voltage
Secondary voltage V
Constant power
280~240
314~270
353~305
Constant current
240~10)
270~116
305~137
392~340
340~158
436~380||tt| |489 ~ 425 | | tt | | 547 ~ 475 | | tt | | 610 ~ 530 | | tt | | 673 ~ 585 | | tt | 7
660~310
Secondary
Voltage difference
Rated secondary
26 729
30 287
37 984
54 467
62 176
69 982
Number of voltage regulation stages
19 (the first 5 stages
constant power output
output, the last 14
stages
constant current
output)
Connection group
Short-circuit impedance
(35kV stage)
(66, 110kV stage)
Rated capacity refers to the capacity under constant power output. Under constant current output, its capacity decreases in proportion to the secondary voltage. 2
Short-circuit impedance refers to the value under the highest secondary voltage. Rated secondary current refers to the value under the lowest secondary voltage at constant power output. When phase-by-phase voltage regulation is adopted, the permissible step difference between each phase shall not exceed three steps. 5.3 Performance parameters
Cooling method
The specified values ​​of no-load current, no-load loss, load loss of arc furnace transformer and the specified values ​​of partial loss of series reactor shall be determined by negotiation between the user and the supplier or refer to Appendix B (suggestive appendix). 5.4 Deviation
The difference between the measured value and the specified value of the parameters of arc furnace transformer shall not exceed the provisions of Table 4.
Total loss
No-load loss
Load loss
Short-circuit impedance
No-load current
Voltage ratio
Main tapping
Other tapping
Should not exceed the provisions of Table 5.
The difference between the measured value and the specified value of the series reactor parameters, Table 5
Reactance voltage drop
JB/T9640-1999
The temperature rise limit of the arc furnace transformer at 1.12 times the rated current shall comply with the provisions of GB1094.2. 5.5.2 The temperature rise limit of the series reactor at the rated current shall comply with the provisions of GB1094.2. 5.5.3 The marking of the cooling method of the arc furnace transformer and the external series reactor shall comply with the provisions of GB1094.2. 5.6 Insulation level
The insulation level of the arc furnace transformer shall comply with the provisions of GB311.1. 5.6.1
5.6.2 The arc furnace transformer shall be able to withstand the operating overvoltage that often occurs during the smelting process without damage. During use, the operating overvoltage of 110kV arc furnace transformers should be controlled below twice the rated voltage, and other voltage levels should be controlled below three times. 5.7 Overload characteristics
5.7.1 The series reactor is intermittent working system, and the continuous working time shall not exceed 1h. 5.7.2 The arc furnace transformer is allowed to overload 20% during the smelting and melting period, and the duration shall not exceed the provisions of Table 6. Table 6
Allowed duration t
Note: The cycle T refers to the time interval between the start of power supply for smelting two adjacent furnaces of steel under normal smelting conditions. h
When the working short-circuit current is set at three times the rated current and the duration is 6s, there should be no damage to all parts of the arc furnace transformer. 5.7.3
5.7.4 The arc furnace transformer should be able to withstand the external short-circuit effect of the secondary end without damage, but the duration of the short-circuit current should not exceed 0.5$. 5.7.5 When the arc furnace transformer is operated at a voltage higher than the rated voltage and (or) the frequency is unstable, it shall comply with the provisions of GB1094.1. 5.8 General structure
5.8.1 The oil level gauge, signal thermometer, signboard, grounding bolt and tap-changer operating mechanism of the oil storage cabinet of the arc furnace transformer shall not be placed on the secondary side.
5.8.2 For arc furnace transformers of 10000kVA and above, current transformers may be provided as shown in the typical connection diagram of Appendix Λ (Standard Appendix). The specific requirements shall be determined by negotiation between the supplier and the user. 5.8.3 All arc furnace transformers shall be equipped with a trolley for easy traction. The trolley rollers shall be able to turn 90°, and its wheelbase or track gauge shall comply with the provisions of Figure 1 and Table 7. Due to structural reasons, the longitudinal wheelbase (or track gauge) of the trolley can adopt a specified value different from the transverse wheelbase (or track gauge). Figure 1
Roller center distance A
5.8.4 All arc furnace transformers shall be equipped with gas relays and pressure relief devices. B
5.8.5 Technical requirements for the forced oil cooling system, oil temperature measuring device, oil tank and its accessories of arc furnace transformers. Parts not specially specified in this standard shall comply with the provisions of GB/T6451. 6 Inspection rules and test methods
6.1 Arc furnace transformer test items
6.1.1 Factory tests include:
JB/T9640-1999
a) primary and tertiary winding (if any) resistance measurement (if the tolerance is exceeded due to reasons such as wire material and lead structure, it should be noted in the factory test report);
b) voltage ratio measurement and connection group number verification; c) short-circuit impedance and load loss measurement;
d) No-load current and no-load loss measurement;
c) Measurement of dielectric loss factor (tano) and insulation resistance of winding to ground (35kV and above);f) Absorption ratio or polarization index test;
g) Externally applied voltage withstand test;
h) Induction voltage withstand test;
i) On-load tap changer test;
j) Insulating oil test;
k) Sealing test of oil tank and oil storage cabinet.
6.1.2 Type test includes:
a) Temperature rise test;
b) Lightning impulse test;
c) Mechanical strength test of oil tank.
6.1.3 Special tests include:
a) Measurement of capacitance between winding and ground and between windings;
b) Measurement of transient voltage transmission characteristics;
c) Measurement of zero-sequence impedance;
d) Short-circuit withstand capacity test;
c) Sound level measurement;
f) No-load current harmonic measurement.
6.2 Test items for series reactors
6.2.1 Factory tests include:
a) Measurement of reactance voltage drop;
b) Measurement of winding DC resistance;
c) Measurement of insulation resistance;
d) Externally applied withstand voltage test;
e) Total loss measurement;
f) Sealing test of oil tank and oil storage cabinet (when attached externally);
g) Insulating oil test (when attached externally).
6.2.2 Type tests include:
a) Temperature rise test;
b) Oil tank mechanical strength test (when attached externally). 6.3 Test methods
6.3.1 The test procedures and test methods for arc furnace transformers shall comply with the provisions of GB1094.1~1094.3, GB1094.5, GB/T6451 and JB/T501.
6.3.2 The test methods for series reactors shall comply with the provisions of JB5346. 7 Marking, packaging, transportation and storage
7.1 All external terminals of arc furnace transformers and reactors shall be marked and have corrosion-resistant nameplates. 7.1.1 The nameplate of the arc furnace transformer should clearly indicate the following items: 5
a) product name, model, product code; b) standard code;
c) manufacturing name;
d) factory serial number;
c) manufacturing year and month;
f) number of phases;
g) rated capacity, kVA;
h) rated frequency, Hz;
i) rated voltage, V or kV;
j) rated current, A or kA;
k) connection group number and winding connection diagram;
JB/T 9640 -1999
1) The tapping voltage (the first tapping position corresponds to the highest secondary voltage), tapping current and tapping capacity of each tapping position; m) Conditions of use (indoor type);
n) Cooling method;
o) Insulation level;
p) Voltage regulation method;
q) Reactor capacity, kvar (products with reactors have this item); r) Actual measured value of short-circuit impedance expressed in percentage (values ​​at the highest and lowest secondary voltages, the large and small impedance values ​​at the highest secondary voltage of the non-excitation voltage-regulating arc furnace transformer without series reactors should be given separately, and the value at the lowest secondary voltage at constant power output should also be given for the on-load voltage-regulating arc furnace transformer);
s) Weight (total weight, oil weight, body hoisting weight, upper oil tank weight, transportation weight), kg or t. Note: For products equipped with bushing-type current transformers, the technical data of the current transformer should be given. The nameplate of the external series reactor should clearly indicate the following items: 7.1.22
a) product name, model, product code; b) standard code:
c) manufacturer's name;
d) factory serial number;
e) manufacturing year and month;
f) number of phases;
g) rated frequency, Hz;
h) cooling method;
i) operating conditions (indoor type);
j) rated capacity, kvar;
k) rated voltage, kV;
1) rated current, A;
m) reactance voltage drop (actual measured value), %;
n) insulation level;
o) weight (total weight, oil weight, body weight, transportation weight), kg. 7.2 The packaging mark of arc furnace transformer products shall comply with the provisions of GB191. During transportation and storage, measures shall be taken to prevent the secondary outlet terminals from being exposed to sunlight and rain.
7.3 The factory technical documents of arc furnace transformer products include installation and operation instructions, product certificate, factory test report, transformer oil test report, product appearance drawing, product disassembly parts list, packing list, accessory installation and operation instructions and nameplate drawing. 6
JB/T9640-1999
Appendix A
(Standard Appendix)
Typical connection diagram
The connection diagram of arc furnace transformer with no excitation voltage regulation with series reactor is as shown in Figure A1 or Figure A2. Series reactor
Series reactor
A2 The connection diagram of arc furnace transformer without no excitation voltage regulation without series reactor is as shown in Figure A3. aaay
A3 The connection diagram of the on-load voltage-adjusting arc furnace transformer can be selected from one of the connection diagrams shown in Figures A4 to A6
JB/T 9640 -1999
Autotransformer
JB/T 9640-1999
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