【 Weak current College 】 mechanical engineering construction site coordination and control (1)

25-2-1 high and low voltage transformer substation project construction site coordination and control

25-2-1-1 construction content overview

(1) null, high and low voltage cable into the cable laying there are three ways, aerial, buried, in trenches. In the urban areas of aerial cable laying the prohibition of the use, the latter two use more trenches lay conducive to maintenance.

(2) high and low voltage distribution, the boundaries by high pressure in the composition of the Chamber, high-voltage power distribution Chamber, the transformer room, low-voltage distribution Chamber, capacitors, high and low voltage electrical simulation controlled room.

(3) high and low-voltage distribution Cabinet, cable access line there are three ways:

1) cable from the cable tray or on busbar advancement.

2) cable from the trench bottom into the next.

3) cable from the Cabinet above, on the ceiling came out of the gutter on the laying of mobility.

(4) the use of diesel generator backup power, you need to do is set the diesel generator room. Diesel generator in urban urban use, environmental departments have special requirements on noise and provisions.

(5) the use of standby power UPS to do, such as larger, set UPS backup power supply unit, the standby power supply noise-free, meet green requirements in urban construction in urban areas is gradually increasing.

(6) high and low voltage equipment, lightning protection and earthing.

(7) the high and low voltage equipment installation, to determine device based geometric dimensions, design units out detail drawing.

(8) the high and low electrical equipment installation and debugging.

By the high and low pressure electrical power distribution project content, combined with professional occupations have construction, ventilation and air conditioning, fire protection, water supply and drainage, weak current projects, and other specialized types of construction, coordination is the key.

25-2-1-2 construction site coordination points

1. a infrastructure engineering construction coordination

(1) pursuant to the requirements and design, the use of building Foundation do grounding device, or use of the building structure of the foundation piles and grounding device connected to and from the foundation of main reinforcement welding into grids.

(2) Thunder down lead by Foundation for steel bars and columns reinforced, welding out two mine down lead and led to the welding of roof and lightning network.

(3) ELV grounding line from basic same point leads, earthing and distribution equipment, protective earth (PE) route, weak ground Express (weak electricity grounding line wear PVC plastic pipe), above-ground lines as designed and provided to each room, or rooms.

2. structural engineering construction coordination

(1) following the structure reinforced fastening and, in the design requirements of pillar, both primary tendon mine down lead construction at the same time.

(2) reserved plate hole shaft, floor reserved plate hole, the hole in the wall is reserved.

(3) embedded iron, as designed, the roof or wall on embedded iron construction. First of all identify the elevation, coordinates, distance between embedded iron should be accurate.

(4) of preformed casing, according to the requirements of construction drawings, select the number of casing diameter, determine, in accordance with the provisions, elevation, coordinates are embedded.

(5) according to the design of high-and low-voltage cabinet selection determines the underlying geometry, provided to the competent technical personnel arrangements for civil construction.

(6) identify oil-immersed transformer concrete track basis, with oil pit geometry, provided to the competent technical personnel arrangements for civil construction.

(7) diesel engine room equipment basis, should promptly provide to the construction of civil engineering and technical personnel arrangements.

(8) outside line construction involving cable drop or out of the trenches lay down or buried.

3. the renovation and low pressure electrical power distribution at the beginning of the installation insert

25-2-1-3 construction site control focus

1. high and low voltage transformer substation project construction basis

(1) high and low voltage transformer substation project construction plan, must be approved by the local supervisor electricity sector approved before construction.

(2) whether the audit construction drawings by have the legal qualification of design unit design, construction plans should cover has the word identifies the construction drawings and indicate the date of construction drawing design, allowing the use of date to confirm that the drawings may be used effectively. Use design modifications of territory, must go through the above procedure does not allow you to use. Construction drawing for it or lose it, you should set aside time stamped drawings, and dated, is not allowed to waste circulation figure at the construction site.

(3) pursuant to the construction drawing design gives the low-down, and InCharge design changes with attention to distinguish between technical and economical design changes with this is completed for summary (knot) operator.

(4) auditing the high and low voltage transformer substation project construction organization plan:

1) technology, the quality of the low-down meets the construction drawing within the master project's request and pursuant to the provisions, should be consistent with existing national standards and norms.

2 the material schemes), processing orders for equipment and labor scheduling, should ensure the follow up civil engineering schedules are not affected. The key is processing orders, the device should be clear processing cycle, to date, without delay, to ensure the completion of the duration.

3) identify large equipment in the building of the channel.

4) owners, supervision, construction unit lists their organisation's network, contact the Superintendent name, communication, in order to work in coordination.

2. high and low voltage transformer substation project construction in front of the control

(1) in conjunction with the construction units and power supply unit verification of high voltage cable into the cable set aside tube elevation, coordinates, position, quantity, diameter is realistic. If there is any change should negotiate for design changes.

(2) check the distribution Chamber doors, Windows, closed, open direction, Equipment, transport channels, roof waterproofing treatment is done.

(3) verify equipment base size, press the construction drawing available for construction, find and correct the problem.

(4) check the indoor distribution should not be horizontal or vertical to the drain pipe, hot and cold water pipes.

(5) distribution Chamber structure concrete additives and decorated with paint effects of chemical constituents, whether or not the transmission operation and human health.

(6) distribution should have good ventilation, indoor, ensure transformer, capacitor, belt load switch, heating equipment and components in a timely manner.

3. on the substation equipment manufacturers of control processing orders

Audit transformation and distribution equipment manufacturers if the following conditions:

(1) have the legal business license and production licenses.

(2) credit certificate, learn about financial and payment capabilities.

(3) business cooperation, certification or agreement to produce agents.

(4) enterprise performance and products related to the inspection certificate (including brochure samples).

(5) a quality assurance system certification and service commitment.

In the tender documents offer comprehensive balanced conditions, merit-based selection of device manufacturers.

4. transformer substation equipment specification focus control

(1) electrical equipment specifications, should meet the design requirements and provisions to ensure that the use of functional, safe and reliable operation.

(2) should provide high voltage transformer manufacturers, low-pressure a second interface is the parent row of bolt connections or Busbar connections; transformer internal fans to power requirements.

(3) high-voltage Cabinet, low-voltage Cabinet access line requirements, ground bus and PE bus installation location requirements; many cable outlet in the same switch, switch export set II-shaped transition plate.

(4) fire requires two way power supply meets the switchover and the changeover; fire State, for non-fire power down, and cut off the signal response.

(5) simulation screen analog signals and digital signals acquisition, through the high and low pressure switches, auxiliary contacts, or by the instrument through the sensor Gets; the contact is normally open or normally closed adoption, is a source of contact or passive contact, press design provides simulation map listing.

(6) building automatic control system requires manufacturers to the number of reserved control interface, contact is normally open or normally closed; is active or passive, inventory increased by device manufacturers are responsible for.

(7) DC control screen manufacturers responsible for the request, such as a second interface of conductors cross-section, Terminal number, line number, position, and the connection of voltage, current, wire cross section, inventory, and supply of high voltage equipment factory settings.

5. high and low voltage distribution equipment installation control

(1) equipment approaching OBA is the key point:

1) inspectors shall consist of the construction units or supervision, construction installation units, suppliers, joint verification and record, parties signature confirmation.

2) based on design drawings and technical documents and lists, check the equipment and accessories and spare parts of specifications, quantity complies with the design requirements, the part is complete, there is no damage to the lost.

3) equipment factory information should be complete. For example equipment drawings, installation manual, test reports, certificates, packing list and other products of the technical file should be complete.

4) used by devices and equipment should be consistent with existing national provisions relating to the specification, and set the nameplate on the device.

5) device appearance inspection without mechanical damage and deformation, paint intact.

6) device internal observation of checks, the key is to wire connection parts, the head and grounding, the master project must be consistent with existing national provisions of the relevant specification.

(2) equipment installation should strictly control the process, first of all, the technology gives the low-down master parts should be clear that the operational requirements and considerations, and to issue to each operator earnestly perform; at the same time, strengthen the self test, detection of mutual seizure, transfer of control, completion of control, make sure the device installation quality to achieve excellent standards.

(3) device debug run control:

1) check the device debugging to run the report in debug program meets the requirements, should do debug project all included in the program, the debugging process of equipment and physical security measures should be improved, debug test complete, audited documents can be into one debugging work.

2) transfer of test should be the local power supply Department of test units. Test standards should be consistent with existing national provisions relating to the specifications, as well as product technical documentation of the relevant provisions.

3) device transmission before doing a comprehensive review to confirm compliance with the safety on the operating conditions should be put into operation.

4) devices run transmission debugging, decided on the basis of the actual situation is half-load debug run or debug running at full capacity, or they are full.

(4) equipment installation and debugging is complete in the delivery of the finished product before use, the site should be under protection of the actual situation, determine product protection measures to ensure that labour is not affected by the infringement and the damage.

(5) the completion of the arrangement of the information and documents shall be in accordance with the provisions of the existing national norms, according to the procedure listed names, do prepare produce for completion.