Canwin is a professional Dry Type Transformers, Electrical Equipment Manufacturer
Language
Canwin is a professional Dry Type Transformers, Electrical Equipment Manufacturer
Box transformer is the integration of high and low voltage primary equipment, transformer, secondary equipment in the factory in a double layer, sealed, anticorrosive, movable outdoor box.
Box type substation, also known as preinstalled substation or preinstalled substation. Is a kind of high voltage switch equipment, distribution transformers and low voltage power distribution equipment, according to the wiring scheme must be arranged in one of the factory indoor, outdoor compact type distribution equipment, the step-down transformer, low voltage power distribution, and other functions organically combined together, installed in a moisture, rust, dust, rat, fire prevention, guard against theft, heat insulation, fully enclosed, movable steel box, Especially suitable for urban network construction and transformation, it is a new substation after the rise of civil substation. Box-type substation is suitable for mines, factories, oil and gas fields and wind power stations. It replaces the original civil power distribution room and power distribution station and becomes a new complete set of transformer and distribution devices.
Box transformer is the integration of high and low voltage primary equipment, transformer, secondary equipment in the factory in a double layer, sealed, anticorrosive, movable outdoor box.
Box type substation, also known as preinstalled substation or preinstalled substation. Is a kind of high voltage switch equipment, distribution transformers and low voltage power distribution equipment, according to the wiring scheme must be arranged in one of the factory indoor, outdoor compact type distribution equipment, the step-down transformer, low voltage power distribution, and other functions organically combined together, installed in a moisture, rust, dust, rat, fire prevention, guard against theft, heat insulation, fully enclosed, movable steel box, Especially suitable for urban network construction and transformation, it is a new substation after the rise of civil substation. Box-type substation is suitable for mines, factories, oil and gas fields and wind power stations. It replaces the original civil power distribution room and power distribution station and becomes a new complete set of transformer and distribution devices.
The structure of the box
The overall structure of box transformer is mainly divided into three parts: high voltage switchgear, transformer and low voltage distribution device.
Sulfur hexafluoride or vacuum circuit breaker, ring switch, load switch and fuse can be used for high voltage switches according to system requirements. Metering devices can also be installed on the high pressure side. The low voltage side is generally installed with the master switch and branch feeder switch, and some feeder switch only. Direct feed to the low-voltage end user. Also can install compensation capacitor, metering device and so on. Distribution transformers generally use oil-immersed or dry transformers.
The high voltage chamber of European box transformer is generally composed of high voltage load switch, high voltage fuse and lightning arrester, etc., which can stop power transmission operation and have over load and short circuit protection. The low voltage chamber is composed of low voltage air switch, current transformer, ammeter, voltmeter and so on. Transformers generally use S9 or dry type.
The box body has two forms, namely "eye" shape layout and "product" shape layout. The high and low voltage chamber arranged in the shape of "mesh" is wide, which is convenient to realize the ring network power supply scheme with ring network or double power supply connection.
American box type combination transformer, its structure is divided into two parts before and after, the front of the wiring cabinet, wiring cabinet includes high and low voltage terminals, high voltage load switch, plug fuse, high voltage tap switch operating handle, oil level meter, oil temperature meter, etc.; The rear is the oil box and heat sink, transformer winding, iron core, high voltage load switch, plug fuse are in the tank body. The box body adopts fully sealed structure. The integrated box is recently developed by domestic manufacturers, and is not widely used. It is a double-layer structure, with high and low voltage chambers placed above the transformer chamber
European, American and integrated box transformer each has advantages and disadvantages, European box transformer volume is larger, high and low voltage switches and transformers are located in a big shell, poor heat dissipation conditions, need to install mechanical exhaust device. American box transformer due to direct external cooling transformer cooling plate, heat dissipation conditions are relatively good, but its shape is worse than European, its appearance is difficult to match with residential areas and other green environment. Integrated box change covers less land, advantages and disadvantages of the American box change similar. In addition, the American, integrated box can only make the following 630kVA capacity, European box can be up to 1250kVA.
Common box substation types are divided into three categories
(1) High voltage switchgear model;
(2) dry type transformer cabinet model;
(3) Model of low-voltage switchgear.
The meaning of the first three letters is:
Z-combined type; B- Substation; N(W)- Indoor (outdoor, optional); X - box; Y-mobile.
Operation and maintenance of container transformer
(I) Basic requirements for box transformer operation
1. The floor of box-type equipment should be placed in a higher place, not in a low-lying place, so as not to affect the operation of rainwater pouring into the box. When pouring concrete platform, there should be a gap. Facilitate the laying of cable inlet and outlet lines.
2, box and ground network must have two reliable connection, box grounding and zero can share a ground network, ground network is generally in the foundation of the four corners of the ground pile, and then connected into one.
3, box equipment can not be piled around illegal, to ensure the ventilation and operation of electrical equipment inspection needs, box change to natural wind circulation cooling, transformer room door should not be blocked.
4. Ring switch and transformer in high voltage power distribution device. Lightning arrester and other equipment should be regularly patrol maintenance, found defects in time repair, regular insulation preventive face test. Disengage the mechanical interlock correctly and operate with insulating rod.
(2) Inspection and maintenance of box transformer The inspection and maintenance of box transformer shall be conducted regularly (not less than once a month) according to the inspection and maintenance cycle to test the temperature at the connection of cable terminal head, check the operation of equipment, and test the face when necessary.
General inspection items are as follows:
1, the foundation is trapped, the hole is blocked, the cabinet has no moisture.
2, grounding device is complete, good connection. Check whether the grounding resistance meets requirements.
3. There is no change in the outdoor environment. Whether impact traffic and pedestrian safety.
4. Check the load of each feeder. Three-phase load balance or overload phenomenon, switch open and close position, instrument indication is correct, control device is working normally.
5, box change dust box change internal dust once every other year, high pressure chamber, low pressure chamber cabinet surface and the surface of the box can be wiped with wet cloth, transformer indoor transformer dust or vacuum cleaner dust.
6. Daily maintenance and overhaul of the fan check the operation of the fan. If the fan is not running, use the temperature and humidity controller to adjust the temperature below the existing temperature and start the fan to check.
7. Maintenance and overhaul of high voltage switch and low voltage switch electric operating mechanism
(1) Check the barometer pointer. Whether it is in the green area. If it is in the red area, open and close the switch. Inform the manufacturer to deal with immediately.
(2) lubrication of mechanical parts, can use general lithium grease (butter) lubrication after the separation and closure operation test.
(3) Cable, lightning arrester routine test according to the routine test requirements, insulation test and leakage current test of cable, lightning arrester.
8, auxiliary routine test of temperature and humidity controller routine test; Routine test of smoke alarm device; Fastening and inspection of terminal block: fastening and inspection of standard parts.
9, terminal block maintenance, due to thermal expansion and contraction, the terminal block may loose, annual inspection should be all terminals in the terminal room retighten. Note: Before refastening, please confirm that the primary AC loop and secondary control loop are powered off to avoid electric shock!
10, maintenance of the box change matters needing attention
(1) the box door is provided with a windproof mechanism, is to ensure that it is kept in a fully open state of a mechanism, close the box door must be lifted up the root of the windproof mechanism, and then close the door can not drag, prevent the mechanism or door deformation, affect the normal use of box change!
(2) After the local manual operation of the high voltage load switch, the operating handle of the load switch should be put back on the handle bracket inside the outer door. Lest it be lost.
(3) When the standby loop of hV ring network cabinet is not connected to cables temporarily, the standby loop should be locked before the ring network cabinet is powered on, or the cable block should be blocked with the supporting insulation cap to avoid accidents!
(4) Dustproof cap equipped with ring net cabinet at the factory can not be used instead of insulation cap!
(5) It is not allowed to insert any short circuit plug into the test hole during operation. Otherwise, the voltage sensor may be damaged.
(6) Low-voltage isolation switch can only be operated in the unlocked position. Do not pull hard pull!
Correct operation of box change
1. Closing operation
Close cable room door -- separate grounding switch -- close load switch.
2, brake operation
Separate load switch -- close grounding switch -- open cable room door.
(1) Cautions during operation
(1) When performing load switch opening and closing operation, the switch must be pushed to the final opening or closing position. Do not loosen or pull out the operating handle before the switch is completed, otherwise the spring rebound will hurt the operator.
(2) When performing load switch opening and closing operation, the operation handle should be outward to prevent injury to the operator during operation.
(3) Before the on-and-off operation of load switch is performed, the electric manual switching knob on the upper left side of the corresponding unit panel must be pulled out and fixed to the manual position by rotating it 90° before the manual operation of load switch can be carried out, otherwise the mechanism may be damaged.
Troubleshooting method for the cause of the fault
(a) : the frame circuit breaker can not be closed
1. The control loop is faulty.
2. The red button on the panel is not reset after the action of the intelligent tripping device.
3. The energy storage mechanism does not store energy
Elimination method
1. Use a multimeter to check the open circuit point.
2. Find out the cause of trip and press the reset button after troubleshooting.
3. Manual or electric energy storage.
(two) : plastic case circuit breaker can not close
1. The mechanism is not reset after tripping.
2. The circuit breaker has undervoltage coil but no power supply at the incoming end.
Elimination method
1. Find out the cause of trip and reset after troubleshooting.
2. Charge the incoming end, reset the handle, and then close the switch.
(3) the circuit breaker will jump when it is closed
1. The outbound loop is short-circuited
Elimination method
1. Must not repeatedly close, must find out the fault, eliminate and then close.
(4) The capacitor cabinet cannot be automatically compensated
1. The power supply of the control loop disappears.
2. The current signal cable is not properly connected.
Elimination method
1. Check the control loop and restore the power supply.
How to box transformer construction box type transformer?
Construction of box transformer grounding device
1, box substation around the grounding network, grounding network and surrounding buildings connected to the grounding network.
2. The buried depth and welding requirements of the grounding device should meet the design requirements and relevant specifications.
3. After the installation of the grounding device, it is necessary to test the grounding resistance in sunny weather and when the humidity of the ground reaches the specifications. If there is a grounding device whose grounding resistance does not meet the requirements, add the corresponding grounding pole and grounding bus according to the requirements until the grounding resistance meets the design requirements.
4. The connection between grounding device and equipment should be reliable and beautiful.
Outdoor box substation installation construction
1. Application for approval: order the corresponding materials and equipment according to the requirements and use requirements of the box transformer design drawing provided by the box transformer manufacturer, and provide the equipment model to the power supply department before ordering the transformer in the box transformer, and report to the power supply department for approval.
2. Wiring: After on-site investigation, determine the reasonable input line point of 10kV power supply and prepare the corresponding power receiving construction scheme
3, embedded: foundation construction of box-type substation, embedded corresponding components and cable protection steel pipe.
4. Installation: after the foundation reaches more than 70% of the design strength, the box-type transformer arrives at the scene for inspection first. The equipment can be installed only after accessories are complete, the equipment is intact, and there is no rust or mechanical damage. In this process, we should still pay attention to the maintenance of the foundation.
5. Check: after the completion of box transformer construction, the construction unit shall first conduct self-adjustment and self-inspection of the equipment, and then report to the construction unit to entrust the test department with test qualification to enter the test box substation.
Source: Internet
Box Transformer link
https://www.canwindg.com/products-detail-136749
