Metal enclosed busbar
key word：Heat exchange element
Category:
Product description
Metal-enclosed bus
1. Introduction
1.1. purpose
It is mainly for power plant transmission, and according to different transmission and distribution circuits, it can be divided into three purposes as follows:
1.1.1. used for bus between generator and generator main transformer, including branch bus to excitation transformer, voltage transformer and auxiliary power transformer.
1.1.2. it is used for bus between auxiliary power transformer, standby transformer and medium voltage switchgear, and between medium voltage switchgear.
1.1.3. used for bus between excitation transformer and excitation slip ring of generator.
1.2. model meaning
**-FM-##/&&-@@/$$
**- type: QL is full connected phase separation, BL is non connected phase separation, BG is non isolated phase co box, GG is isolated phase co box
FM - metal enclosed bus
##--------Rated voltage (kV)
&&----------Rated current (a)
@@------------Cooling mode: Z means natural cooling, q is forced cooling, and j is local cooling.
$$------ special code: I refers to micro positive pressure, Ⅱ is fast saturation reactor, Ⅲ is micro positive voltage and fast saturation reactant coexist
1.3. structural characteristics
Metal enclosed bus is a combination of metal shell to close the conductor with insulation. Compared with bare bus, metal enclosed bus has the following advantages:
1.3.1. after the enclosure is sealed, foreign matters can be prevented from entering, and phase to phase short circuit can be avoided, especially the isolated phase enclosed bus. The conductor is enclosed in the grounding shell, which ensures the safety of the operator.
1.3.2. the eddy current and circulation generated by the shell of the fully connected phase separated bus block the magnetic field generated by most of the conductors, reduce the heating of nearby steel structure and reduce the electric power of the conductor and the shell.
1.3.3. the standardized production of the factory reduces the workload of site installation to the greatest extent.
1.3.4. it is safe and reliable to operate, and easy to overhaul and maintain.
1.3.5. further improve the sealing performance, and the enclosure of isolated phase enclosed bus can be used as the ventilation pipe of forced air-cooled bus.
1.4. type of enclosed bus
1.4.1. isolated phase enclosed bus: metal enclosed bus with separate metal shell and gap isolation between each phase shell can be divided into natural cooling off phase bus and forced cooling isolated bus according to different cooling modes. The shell and conductor of isolated phase enclosed bus are all industrial pure aluminum or aluminum alloy with high conductivity. The shell of isolated phase enclosed bus is generally circular, and the shape of conductor can be circular or octagonal, as shown in Fig. 34-1 and Fig. 34-2.
1.4.1.1. fully connected isolated phase enclosed bus. Each phase enclosure is electrically connected, and the isolated phase enclosed bus is short circuited and grounded at the outer end of the three-phase shell head respectively, as shown in Fig. 34-3.
1.4.1.2. isolated (segmented insulation) isolated phase enclosed bus. Each phase enclosure is divided into several sections, with insulation between sections. Only one point of isolated phase enclosed bus is connected to ground in each section, as shown in Fig. 34-4.
1.4.2. common box enclosed bus: metal enclosed bus with three-phase bus conductor enclosed in the same metal shell. The shell material of enclosed bus bar of common box is generally made of industrial pure aluminum or aluminum alloy material, and the material of conductor can be industrial pure aluminum or industrial pure copper with high conductivity. The shell of enclosed bus of common box is generally rectangular, and the shape of conductor can be rectangle, pipe type or groove type, etc., as shown in Fig. 34-5-34-7.
1.4.2.1. enclosed bus without separated phase common box: the common box enclosed bus without partition between each phase bus conductor.
1.4.2.2. isolated common box enclosed bus: the common box enclosed bus separated by partition plate between each phase bus conductor is identical with that of non isolated phase common box, as shown in Fig. 34-8.
1.5. Product series
See table 34-1 ~ table 34-3 for main product series. Special grade can be negotiated with manufacturer.
Table 34-1 main product series of self cooling fully connected isolated phase enclosed bus.
| Rated voltage（KV) | Rated current（A） |
| 6.3～35 | 1000 |
| 1250 | |
| 1600 | |
| 2000 | |
| 2500 | |
| 3150 | |
| 4000 | |
| 5000 | |
| 6300 | |
| 8000 | |
| 10000 | |
| 12500 | |
| 16000 | |
| 20000 | |
| 25000 |
Table 34-2 main product series of forced cooling all connected isolated phase enclosed bus.
| Rated voltage（KV) | Rated current（A） |
| 18～35 | 25000 |
| 31500 | |
| 40000 | |
| 50000 |
Table 34-3 main product series of common box enclosed bus
| Rated voltage（KV) | Rated current（A） |
| 1～35 | 630 |
| 800 | |
| 1000 | |
| 1250 | |
| 1600 | |
| 2000 | |
| 2500 | |
| 3150 | |
| 4000 | |
| 5000 | |
| 6300 | |
| 8000 | |
| 10000 | |
| 12500 |
2. Main technical parameters (see table 34-4)
Table 34-4 main technical parameters of metal enclosed bus
| No. | Parameter | Index |
| 1 | Rated voltage (kV) | 1～35 |
| 2 | Rated current（A） | 630～5000 |
| 3 | Rated frequency（HZ) | 50 |
| 4 | Rated lightning impulse withstand voltage (kV) | 8～185 |
| 5 | Rated 1min power frequency withstand voltage (dry test, kV) | 4.2～100 |
| 6 | Rated 1min power frequency withstand voltage (wet test, kV) | 18～80 |
| 7 | Dynamic stable current (peak) (kA) | 40～800 |
| 8 | 2s thermal stability current (effective value) (kA) | 16～315 |
| 9 | Leakage ratio distance（mm/kV) | 17～25 |
| 10 | Conductor material | Industrial pure aluminum, aluminum alloy or industrial pure copper |
| 11 | Conductor specification (mm) | — |
| 12 | Shell material | Industrial pure aluminum or aluminum alloy |
| 13 | Shell specification (mm) | — |
| 14 | Bus phase to phase distance (mm) | — |
| 15 | Maximum allowable temperature of normal operation bus conductor (℃) | 90 |
| 16 | Maximum allowable temperature of bus shell during normal operation (℃) | 70 |
| 17 | Maximum allowable temperature of silver plated joint of bus conductor during normal operation (℃) | 105 |
| 18 | Maximum ambient temperature (℃) | 40 |
| 19 | Altitude (m) | ≤1000 |
| 20 | Seismic intensity | 8 |
| 21 | Cooling mode | Natural cooling / forced cooling |
| 22 | Bus painting (exterior) | Matt black paint |
| 23 | Shell painting (inner surface) | Matt black paint |
| 24 | Shell painting (outer surface) | Light paint |
3. Structural dimensions (see table 34-5 ~ table 34-14)
Table 34-5 structural dimensions of typical fully connected self cooling isolated phase enclosed bus matching with 300MW Generator Unit
| No. | Basic technical data | Index | |
| Generator circuit (main circuit) | Branch circuit | ||
| 1 | Rated voltage（kV） | 20 | |
| 2 | Rated frequency（Hz) | 50 | |
| 3 | Rated current（A） | 12500 | 4000 |
| 4 | Outer diameter and thickness of aluminum bus (mm × mm) | 500×12 | 150×10 |
| 5 | Outer diameter and thickness of aluminum shell (mm × mm) | 1050×8 | 650×5 |
| 6 | Phase to phase distance (mm) | ≥1300 | ≥1000 |
Table 34-6 structural dimensions of typical fully connected self cooling isolated phase Enclosed Busbar matched with 600 MW generating unit
| No. | Basic technical data | Index | ||
| Generator circuit (main circuit) | Main transformer circuit (delta loop) | Branch circuit | ||
| 1 | Rated voltage（kV） | 24 | ||
| 2 | Rated frequency（Hz) | 50 | ||
| 3 | Rated current（A） | 24000 | 14000 | 4000 |
| 4 | Outer diameter and thickness of aluminum bus (mm × mm) | 900×18 | 600×12 | 200×10 |
| 5 | Outer diameter and thickness of aluminum shell (mm × mm) | 1450×10 | 1150×8 | 750×5 |
| 6 | Phase to phase distance (mm) | ≥1800 | ≥1500 | ≥1000 |
Table 34-7 structural dimensions of typical fully connected self cooling isolated phase Enclosed Busbar matched with 1000MW generating unit
| No. | Basic technical data | Index | ||
| Generator circuit (main circuit) | Main transformer circuit (delta loop) | Branch circuit | ||
| 1 | Rated voltage（kV） | 27 | ||
| 2 | Rated frequency（Hz) | 50 | ||
| 3 | Rated current（A） | 28000 | 16000 | 4000 |
| 4 | Outer diameter and thickness of aluminum bus (mm × mm) | 950×18 | 650×12 | 200×10 |
| 5 | Outer diameter and thickness of aluminum shell (mm × mm) | 1450×10 | 1250×8 | 830×7 |
| 6 | Phase to phase distance (mm) | ≥2000 | ≥1800 | ≥1100 |
Table 34-8 structural dimensions of typical non isolated phase common box Enclosed Busbar (copper bar conductor 3150A)
| No. | Basic technical data | Index |
| 1 | Rated voltage (kV) | 6.3～10 |
| 2 | Rated frequency (Hz) | 50 |
| 3 | Rated current (A) | 3150 |
| 4 | 1min power frequency withstand voltage (kV) | 42 |
| 5 | Lightning impulse withstand voltage (kV) | 75 |
| 6 | Conductor size (sheet number × height × thickness) (mm × mm × mm) | 2×120×10 |
| 7 | Shell size (width × height × thickness) (mm × mm × mm) | 800×500×4 |
| 8 | Interphase spacing (mm) | 220 |
Table 34-9 structural dimensions of typical non isolated phase common box Enclosed Busbar (copper bar conductor 4000A)
| No. | Basic technical data | Index |
| 1 | Rated voltage (kV) | 6.3～10 |
| 2 | Rated frequency (Hz) | 50 |
| 3 | Rated current (A) | 4000 |
| 4 | 1min power frequency withstand voltage (kV) | 42 |
| 5 | Lightning impulse withstand voltage (kV) | 75 |
| 6 | Conductor size (sheet number × height × thickness) (mm × mm × mm) | 3×120×10 |
| 7 | Shell size (width × height × thickness) (mm × mm × mm) | 800×500×4 |
| 8 | Interphase spacing (mm) | 245 |
Table 34-10 structural dimensions of typical non isolated phase common enclosure busbar (2500A aluminum conductor)
| No. | Basic technical data | Index |
| 1 | Rated voltage (kV) | 6.3～10 |
| 2 | Rated frequency (Hz) | 50 |
| 3 | Rated current (A) | 2500 |
| 4 | 1min power frequency withstand voltage (kV) | 42 |
| 5 | Lightning impulse withstand voltage (kV) | 75 |
| 6 | Conductor size (sheet number × height × thickness) (mm × mm × mm) | 2×120×10 |
| 7 | Shell size (width × height × thickness) (mm × mm × mm) | 800×500×4 |
| 8 | Interphase spacing (mm) | 220 |
Table 34-11 structural dimensions of typical non isolated phase common enclosure busbar (aluminum conductor 3150A)
| No. | Basic technical data | Index |
| 1 | Rated voltage (kV) | 6.3～10 |
| 2 | Rated frequency (Hz) | 50 |
| 3 | Rated current (A) | 3150 |
| 4 | 1min power frequency withstand voltage (kV) | 42 |
| 5 | Lightning impulse withstand voltage (kV) | 75 |
| 6 | Conductor size (sheet number × height × thickness) (mm × mm × mm) | 3×120×10 |
| 7 | Shell size (width × height × thickness) (mm × mm × mm) | 880×500×4 |
| 8 | Interphase spacing (mm) | 245 |
Table 34-12 structural dimensions of typical non isolated phase common enclosure busbar (aluminum tube conductor 2500A)
| No. | Basic technical data | Index |
| 1 | Rated voltage (kV) | 6.3～10 |
| 2 | Rated frequency (Hz) | 50 |
| 3 | Rated current (A) | 2500 |
| 4 | 1min power frequency withstand voltage (kV) | 42 |
| 5 | Lightning impulse withstand voltage (kV) | 75 |
| 6 | Conductor size (sheet number × height × thickness) (mm × mm × mm) | 100×10 |
| 7 | Shell size (width × height × thickness) (mm × mm × mm) | 900×500×4 |
| 8 | Interphase spacing (mm) | 250 |
Table 34-13 structural dimensions of typical non isolated phase common enclosure busbar (aluminum tube conductor 3150A)
| No. | Basic technical data | Index |
| 1 | Rated voltage (kV) | 6.3～10 |
| 2 | Rated frequency (Hz) | 50 |
| 3 | Rated current (A) | 3150 |
| 4 | 1min power frequency withstand voltage (kV) | 42 |
| 5 | Lightning impulse withstand voltage (kV) | 75 |
| 6 | Conductor size (sheet number × height × thickness) (mm × mm × mm) | 130×12 |
| 7 | Shell size (width × height × thickness) (mm × mm × mm) | 1000×500×4 |
| 8 | Interphase spacing (mm) | 275 |
Table 34-14 structural dimensions of typical non isolated phase common enclosure busbar (aluminum tube conductor 4000A)
| No. | Basic technical data | Index |
| 1 | Rated voltage (kV) | 6.3～10 |
| 2 | Rated frequency (Hz) | 50 |
| 3 | Rated current (A) | 4000 |
| 4 | 1min power frequency withstand voltage (kV) | 42 |
| 5 | Lightning impulse withstand voltage (kV) | 75 |
| 6 | Conductor size (sheet number × height × thickness) (mm × mm × mm) | 130×16 |
| 7 | Shell size (width × height × thickness) (mm × mm × mm) | 1000×500×4 |
| 8 | Interphase spacing (mm) | 275 |
4. Selection method
According to the specific requirements of users, the factory can use the special computer program to select the type. If necessary, it can test and verify the computer selection results.
5. Scope of supply and ordering instructions
5.1. Scope of supply
The scope of supply includes product design, procurement, manufacturing, factory inspection, drawing for installation and commissioning, and operation and maintenance manual. See table 34-15 and table 34-16
Table 34-15 supply scope of typical isolated phase enclosed bus
| No. | Name of equipment and parts | No. | Name of equipment and parts |
| 1 | Main circuit | 21 | Sealing structure of branch circuit |
| 2 | Triangle connection circuit | 22 | Generator short circuit test device |
| 3 | Branch circuit of excitation transformer | 23 | Expansion structure of main circuit |
| 4 | Branch circuit of voltage transformer cabinet | 24 | Main circuit short circuit board and grounding device |
| 5 | Branch circuit of auxiliary transformer | 25 | Triangle circuit short board and grounding device of main transformer |
| 6 | Micro positive pressure device | 26 | Branch circuit short circuit and grounding device |
| 7 | Generator neutral connection structure | 27 | Water discharge device |
| 8 | Voltage transformer cabinet | 28 | Infrared on line temperature measuring device |
| 9 | Neutral grounding transformer cabinet | 29 | Hydrogen removal unit |
| 10 | Terminal box of generator outlet side | 30 | Interface of hydrogen leakage detection device |
| 11 | Generator neutral terminal box | 31 | Through wall structure |
| 12 | Connection structure with generator | 32 | Shell support structure |
| 13 | Connection structure with main transformer | 33 | Voltage transformer |
| 14 | Connection structure with generator circuit breaker | 34 | Lightning arrester |
| 15 | Connection structure with auxiliary transformer | 35 | High voltage fuse |
| 16 | Connection structure with voltage transformer cabinet and lightning arrester cabinet | 36 | Current transformer |
| 17 | Connection structure with excitation transformer | 37 | Installation structure of current transformer |
| 18 | Connection structure with neutral point cabinet | 38 | Detachable connection structure |
| 19 | Sealing structure of main circuit | 39 | Forced air cooling device |
| 20 | Sealing structure of voltage triangle circuit of main transformer | 40 | Deionization device |
Table 34-16 supply scope of typical common box enclosed bus
| No. | Name of equipment and parts |
| 1 | Common box bus of station transformer circuit |
| 2 | Common box bus of standby transformer circuit |
| 3 | Converter excitation common box bus |
| 4 | DC excitation common box bus |
| 5 | Connection structure with equipment |
| 6 | Through wall structure |
| 7 | Sealing structure |
| 8 | Telescopic structure |
| 9 | Shell support structure |
5.2. Ordering requirements
The Demander shall provide the following information:
5.2.1. Service conditions:
5.2.1.1. Maximum ambient air temperature.
5.2.1.2. Minimum ambient air temperature.
5.2.1.3. Altitude.
4.5.
5.2.1.5. Earthquake intensity.
5.2.1.6. Wind pressure.
5.2.1.7. Icing thickness.
5.2.1.8. Rain, snow and sunshine.
5.2.1.9. Other special use conditions.
5.2.1.10. Transportation conditions.
5.2.2. Parameters and data of generator, main transformer, auxiliary transformer and related equipment:
5.2.2.1. Rated voltage.
5.2.2.2. Maximum voltage.
5.2.2.3. Rated current.
5.2.2.4. Maximum working current.
5.2.2.5. Rated insulation level.
5.2.2.6. Main wiring diagram.
5.2.2.7. Generator neutral grounding mode.
5.2.2.8. Layout plan and section of metal enclosed bus.
5.3. Type and parameters of metal enclosed bus:
5.3.1. circuit name.
5.3.2. type.
5.3.3. cooling mode.
5.3.4. length.
5.3.5. rated voltage.
5.3.6. rated current.
5.3.7. rated frequency.
5.3.8. power frequency withstand voltage.
5.3.9. impact withstand voltage.
5.3.10. thermal stability current, action time and dynamic stable current.
5.4. equipment parameters matching with metal enclosed bus:
5.4.1. voltage transformer parameters.
5.4.2. current transformer parameters.
5.4.3. arrester parameters
5.4.4. high voltage fuse parameters.
5.4.5. neutral grounding device parameters.
5.4.6. other equipment parameters.
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