JB/T 5344.1-1991 General rules for transformers for submerged arc furnaces
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T5344.1-1991
Submerged Arc Furnace Transformer
Published on June 28, 1991
Implemented on July 1, 1992
Published by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Mechanical Industry Standard of the People's Republic of China
Submerged Arc Furnace Transformer
Subject Content and Scope of Application
JB/T5344.1-1991
This standard specifies the classification, technical requirements, test items and methods, inspection rules and markings, packaging, transportation, storage and other requirements of transformers for submerged arc furnaces.
This standard applies to transformers for oil-immersed submerged arc furnaces. 2
Referenced standards
GB311.1~311.6
GB1094.1~1094.5
Packaging, storage and transportation pictorial symbols
Insulation coordination and high voltage test technology for high-voltage power transmission and transformation equipment Power transformers
GB6451.1~6451.4
Technical parameters and requirements for three-phase oil-immersed power transformers GB2900.1||tt| |GB2900.15
GB7252
JB3837
3 Terms
Electrical terminology Basic terminology
Electrical terminology Transformer, mutual inductor, voltage regulator, reactor Analysis and judgment of dissolved gas in transformer oil Method for compiling transformer product models
The terms in this standard shall comply with the provisions of GB29CC.1 and GB2900.15. 4 Product classification and model
4.1 Submerged arc furnace transformers are divided into ferroalloy furnace transformers, calcium carbide furnace transformers, yellow phosphorus furnace transformers and other types of submerged arc furnace transformers according to the classification method of the corresponding submerged arc furnace.
4.2 The product model of submerged arc furnace transformers shall be compiled according to the provisions of JB3837. 4.3 The rated capacity of submerged arc furnace transformers shall comply with the provisions of Table 1. When it cannot meet the use requirements, other special capacities may be selected. The recommended rated capacity of the single-phase ore-heating furnace transformer that constitutes the three-phase transformer group is 1/3 of the value in Table 1. The rated capacity of other single-phase ore-heating furnace transformers is selected according to Table 1.
The rated capacity, basic parameters and performance data of different types of ore-heating furnace transformers are determined according to the corresponding standards. 5 Technical requirements
5.1 Conditions of use
5.1.1 Normal conditions of use
a, indoor installation;
b, the installation site altitude does not exceed 1000m;
Ambient medium temperature:
Maximum temperature +40℃,
Approved by the Ministry of Machinery and Electronics Industry on June 28, 1991 and implemented on July 1, 1992
Maximum daily average temperature +30℃,
Maximum annual average temperature +20℃,
Minimum temperature -5℃,
JB/T5344.1-1991
The maximum temperature of cooling water at the inlet of the oil-water cooler is +30℃, and the waveform of the power supply voltage is approximately sinusoidal; the power supply voltage of the multi-phase transformer should be approximately symmetrical. Table 1
5.1.2 Special use conditions
Use conditions that do not comply with the provisions of Article 5.1.1 are special use conditions. Under special use conditions, the user department should propose them when ordering: the manufacturer and the user department shall negotiate and determine the special requirements for the product. 5.2 Temperature rise limit, cooling method mark
5.2.1 For the submerged arc furnace transformer with insulation material heat resistance grade A, the temperature rise limit at 1.1 times the rated current shall comply with the provisions of Table 2.
Top oil
Core body, oil tank and structural parts surface
Temperature rise limit
Should be a temperature that does not damage the adjacent insulating materials 5.2.2 The cooling method mark of the submerged arc furnace transformer shall comply with the provisions of GB1094.2. Rated performance data deviation
The rated performance data deviation of the submerged arc furnace transformer must comply with the provisions of Table 3. Insulation level
5.4.1 The insulation level of the transformer of the submerged arc furnace shall comply with the provisions of GB311.1. 5.4.2 The marking of the insulation level of the transformer of the submerged arc furnace shall comply with the provisions of GB1094.3. 2
Measurement method
Resistance method
Thermometer method
Thermometer method
5.5 General structural requirements
JB/T5344.1-1991
Total loss
Main tapping
Voltage ratiobzxZ.net
Other tapping
5.5.1 All transformers of submerged arc furnaces must be equipped with gas relays and pressure relief devices. 5.5.2 Transformers of submerged arc furnaces must be equipped with oil storage cabinets, and transformers of 8000kV·A and above should take measures to prevent oil aging. 5.5.3 The structural type, size and relative position of the secondary outlet terminals of the transformer of the submerged arc furnace shall meet the following requirements. 5.5.3.1 The layout of the plate-type secondary outlet terminal is shown in Figure 1- to Figure 1-g. Figure 1-a Single branch structure
Figure 1-b 2 branch structure
Figure 1-c 3 branch structure
Figure 1-d 4 branch structure
JB/T5344.1-1991
“!”“”
Figure 1-e 2×2 branch structure
Figure 1-f 2×3 branch structure
Figure 1~g 2×4 branch structure
JB/T5344.1-1991
5.5.3.2 Secondary The dimensions of the outlet terminal board are shown in Figure 2. The current density of the sub-terminal shall not exceed the value specified in Table 4. 5.5.3.3 Plate-type secondary terminals in the air 150 terminals F300 terminals Thickness of the word 12 or 12.5 JB/T 5344.1 -1991
5.5.3.4When water-cooled secondary outlet terminals are used, please refer to Appendix A. Current density
5.5.4All submerged arc furnace transformers should be equipped with a trolley. The trolley should be easy to pull, the rollers should be able to turn 90°, and its wheelbase or track gauge should comply with the provisions of Figure 3 and Table 5.
Roller center distance
Note: Due to structural reasons, the longitudinal wheelbase (or track gauge) of the trolley can adopt a different specified value from the transverse wheelbase (or track gauge) or its multiples. 5.5.5 The oil level gauge, signal thermometer, nameplate and tap-changer operating mechanism of the oil storage cabinet of the submerged arc furnace transformer shall not be placed on the secondary side.
General structural requirements for the oil cooling system and control box, oil protection device, oil temperature measuring device, oil tank and its accessories, etc., shall comply with the provisions of GB6451.1~6451.4 for the parts not specially specified in 5.5.6
of this standard. 6
Test items, test methods and inspection specifications 6.1 The factory test, type test and special test items and test methods of the transformer for submerged arc furnace shall comply with the provisions of GB1094.1~1094.5.
Note: The induction high voltage test shall be carried out at the tapping position of the highest secondary voltage. 6.2 The unbalance rate of the primary side DC resistance of the transformer for submerged arc furnace shall comply with the provisions of GB6451.1~6451.4. There is no specific provision for the unbalance rate of the secondary side DC resistance, but the actual measured value of the DC resistance shall be provided to the user department. .3 Insulation characteristics (insulation resistance, absorption ratio, dielectric loss rate) shall comply with the provisions of GB6451.1~6451.4. 6.4 The strength of the oil tank of the submerged arc furnace transformer shall comply with the provisions of GB6451.1~6451.4. 6.5 The sealing test of the submerged arc furnace transformer shall comply with the provisions of GB6451.1~6451.4. 6.6 For submerged arc furnace transformers with a voltage of 63kV and above or a capacity of 8000kV.A and above, the dissolved gas in the transformer oil shall be analyzed before leaving the factory. The detection method shall comply with the relevant standards such as GB7252. 7 Marking, packaging, transportation, storage
7.1 All external terminals of the submerged arc furnace transformer shall be marked. The corresponding winding terminal number shall be marked. Each transformer shall have a nameplate that is not easy to corrode.
The nameplate of the submerged arc furnace transformer shall clearly indicate the following items: a, transformer name, model, product code, trademark, b. Standard code;
Manufacturer name (including country name),
Factory serial number and manufacturing year and month;
Rated capacity (kV·A),
Rated frequency (Hz),
Rated voltage (V or kV);
Number of phases,
JB/T 5344.1 -1991
The voltage of each tap position (the first tap position corresponds to the highest voltage), tap current and tap capacity, connection group number and winding connection diagram;
Usage conditions,
Cooling method
Insulation level,
Impedance voltage (%):
No-load loss and load loss (W or kW), no-load current (%)
Weight (total weight, oil weight, body weight, transportation weight) (kg or t)
Some special requirements agreed upon by the manufacturer and the user. Note ①
For transformers with strong oil cooling, the allowed working time limit when the cooler stops running under full load should be noted. Impedance voltage, no-load loss, load loss and no-load current are the actual measured values at the maximum, rated and minimum values of the secondary voltage. For transformers with series voltage regulation, the actual measured values at the middle position should also be given. .2
The packaging mark of the transformer product of the submerged arc furnace shall comply with the provisions of GB191. During transportation and storage, measures shall be taken to prevent the secondary outlet terminal board from being exposed to the sun and rain.
7.3 Factory Technical Documents
The factory technical documents include installation and operation instructions, product certificate, product appearance drawing, product disassembly parts list, packing list, nameplate drawing filled with data and transformer oil test report. For submerged arc furnace transformers of 8000kV.A and above, there shall be a transportation dimension drawing. For the special requirements of users, the manufacturer shall provide test results or special instructions. The factory technical documents shall be properly packaged to prevent moisture and loss. 7
JB/T5344.1-1991
Appendix A
Water-cooled outlet terminal of submerged arc furnace transformer
(reference part)
The secondary outlet terminal can adopt the structural type and parameters shown in Figure A1 to Figure A4. Submerged arc furnace transformer water-cooled type:
4-middle 45
fixed plate
Figure A1U-type tube a
U-type conductive tube
fastening nut
6 pad diagram
3 terminal
a sealing gasket
JB/T 5344.1 - 1991
Figure A2U-type pipe b
1-fixed plate
2Insulation, sealing device
5-—Pipe clamp
6—Short mesh steel pipe
U-type conductive pipe
7——Fasteners
Note: Items 4, 5, and 6 in Figure 2 are made by the user department, 530
Rubber water pipe
—Flexible connection device
1--U-type conductive pipe
JB/T5344.1-1991
2-Insulation, sealing device
U-type pipe c
3 Water pipe
1 Wiring device
6-4
5-fixed plate
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