Electrical Supervision Summary
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Electrical professional supervision work summary 1
In accordance with the law-abiding, impartial, scientific and integrity of the principle of supervision to the construction unit to do the work of supervision of the "three control, two management, a coordination" policy. Strengthen the supervision of the construction unit's strength, do a good job of dynamic control. xx supervision of the construction area of about xx million square meters, the work, adhere to the quality first, prevention first, process control, the guiding ideology of the terminal gatekeepers, abide by the professional ethics, to maintain the image of the supervision company, the construction unit of strict supervision, supervision and help combination of construction units, warm service to the construction unit. In the quality control aspects of the following points.
First, quality control. Do a good job in the construction of quality control points set
(1) the key parts or weak links, generally to analyze in advance the causes of problems that may cause quality, and then develop countermeasures for the causes of pre-control.
(2) the construction of key processes or links and hidden works, the use of altered parts and new materials parts or links, the construction of difficult, construction conditions or technical difficulties in the process or link.
(3) control of construction personnel. Supervision, unqualified, undocumented, low cultural level of personnel, insensitive response to the construction personnel should be controlled, focusing on supervision; the quality of construction materials, due to the direct impact on the quality and safety of the project, should be focused on the quality and performance control. (Such as: low temperature in winter pvc pipe is easy to break, etc., in the pouring of the plate, strongly require the electrician to stand by and watch)
2, the contracted construction unit to do a good job on the technical bottom of the control. It is one of the conditions to ensure the quality of construction, therefore, each sub-projects to be carried out before the start of implementation.
(1) strict control of materials, finished products, semi-finished products, components and accessories inspection work, to eliminate the unqualified products used in the project.
(2) review the construction unit's technical delivery information, to understand the site delivery situation, to avoid disconnecting, to grasp the dynamics of the construction unit. xx urban and rural project department xx building electrical *** divided into x shifts, I have paid attention to the quality of personnel between the various shifts in the construction, the construction method, the quality of construction, etc., the differences between the targeted measures to control the quality of the construction of a certain degree of improvement.
(3) sample room to start: in order to reduce large-scale errors and rework, to make a sample room to start to standardize the behavior of the construction unit and the quality of construction plays an important role. Process construction of each team to take the sample room to start the method, the control effect is better. Requirements for each construction unit and each team to make a set of sample room on each building, acceptance before the full launch of the installation work.
(4) construction, take on-site supervision, inspection, parallel inspection methods, hidden works, important parts, key links, weak links to strengthen quality control, to do everything personally. For the emergence of abnormalities, serious analysis, responsibility, serious treatment, larger problems and electrical supervision engineer xx timely communication.
3, the control of incoming materials and components. Where the raw materials delivered to the construction site, before entering the site should be submitted to the supervisor of the "project materials / components / equipment declaration form", colleagues with product factory certificates and technical specifications, and by the contracting unit in accordance with the provisions of the requirements of the test inspection report, by our supervisory engineers to review and confirm that qualified before entering the site.
4, progress control
The construction progress of a project department of An Da compared to the xx project department slow, and construction quality is poor, in this case, by analyzing the personnel, machinery and volume of work and other circumstances, remind the construction unit of An Da not to change again many times to increase the number of advanced machinery (such as the need to increase the bending machine, etc.), to take the second part of the electrical installation of the advanced experience of the Department of An Da, urged the construction unit adjusted! Personnel, machinery, to ensure that the total construction period laid the foundation.
5, engineering construction quality acceptance. Engineering construction quality acceptance is an important part of engineering construction quality control. Must be implemented xx "unified standard for quality acceptance of construction works," which is a general guideline for the acceptance specification of the various professions of construction works (x) line pipe laying:
①, dark distribution of steel pipe, interface with butt-welding phenomenon. In the inspection process will often encounter this problem, thick-walled steel pipe (wall thickness greater than xmm) butt-welding connection, will produce internal tuberculosis, so that when wearing cable damage to the insulation layer, thin-walled steel pipe (wall thickness less than or equal to xxmm) welded connection will produce a burn-through, buried in the concrete will be seeped into the slurry, leading to clogging of the conduit. These phenomena are not allowed to happen. Therefore, xx in xx mandatory provisions: metal conduit is strictly prohibited butt welding connection, galvanized and wall thickness less than or equal to xmm steel conduit shall not casing welding connection. Thick-walled steel pipe should be added casing welding, weld seam requires full and dense. Galvanized steel pipe is required to be threaded connections, connections at both ends with a special grounding card fixed across the grounding wire. Thin-walled steel pipe threaded connection, tight connection, etc., but the interface is required to take blocking measures to prevent moisture from penetrating into the tube caused by wire insulation layer aging, and increase the electrical conductivity of the connection.
②, steel wiring pipe laying depth does not meet the specification requirements. Concealed piping buried depth is too deep for connection with the box, box, sometimes too deep groove will affect the quality of the wall and other buildings; too shallow is also not conducive to connection with the box, box, will also make the building surface cracks, in some wet places (such as basements, etc.), the rust of the steel conduit will be visible on the wall, so the depth of the burial is appropriate, both to protect the conduit without affecting the quality of the building. Therefore xx requirements: concealed with the conduit, the thickness of the protective layer is greater than xmm, and the groove should be not less than the strength level of mx cement mortar plaster protection. Slotting requires mechanical slotting, and manual slotting is prohibited. Also, the steel pipe inside and outside do not brush rust protection paint, for these problems, in the inspection site when it urged the construction party to immediately correct.
③, pvc20 pipe dosage is the most, in the laying distance is not allowed, the corner of the bend is too small, docking is not coated with glue, carve the width of the line groove is not enough to restore the filling of hollow drums, carve the groove with the phenomenon of horizontal walk. These problems are almost daily constraints in the field view.
(2) distribution box installation:
a, distribution box of the reserved hole. Due to the drawings to the electrical installer to give way to the coordination of the note: "electrical construction, electricians should work closely with, do a good job reserving holes and buried pieces of work", and drawings of the reserved holes are not detailed marked specific size, so, resulting in most of the building appeared to be without a unified standardized user metering box reserved holes. After careful statistics, x building x units, only built x floors, in x metering box reserved holes, only x holes are still qualified, the rest of the x did not leave holes; x reserved holes do not have beams, xx "masonry construction quality acceptance specification" article x, masonry wall left hole width more than x should be set up beams; x left holes and its bad (there are x holes in the photo), like this example is more prominent in the x building. There are more examples like this on building x. There are more examples on other buildings.
b, the quality of the box has the following aspects:
① not according to the drawings required size stereotypes.
② sent to the site of the product size does not match the drawings. In response to the above problems: ① Requirements should be strictly in accordance with the design drawings and relevant specifications for ordering. After the arrival of the appearance of the inspection should be carried out to check whether there is a factory certificate of conformity, whether the nameplate is correct, whether the accessories are complete, whether the insulation parts are defective, cracks, whether the coating is complete. ② distribution box iron box should be consistent with the drawing size, where inconsistent with the size, to find out the factory is to explain the production of data according to the requirements. Then figure out the delivery notice.
(3) the installation of a variety of concealed:
①, the height of the socket concealed box to the ground does not put x-ray installation or x-ray wrong x-centimeter installation, so that the installation of various types of concealed height is not permitted; the same wall a few concealed box installation is not in a plane.
②, air conditioning, water heater high plug box height is not allowed;
③, switch box location is messy, the new requirements are: when encountering concrete columns, can be away from the edge of the x, so after the completion of the stucco, when you can not see the columns, the switch distance from the edge of the considered not the same. Such problems are corrected one by one during the inspection.
(4) lightning protection and grounding system installation
Some lightning belt and grounding device lap length is not enough, and single-sided welding. Lightning protection belt and grounding device installation requirements: ① flat steel lap length should not be less than two times its width, three-side welding, when the flat steel width is different, the lap length of the wide shall prevail; ② round steel lap length should not be less than six times its diameter, double-sided welding, when the diameter is different, the lap length of the diameter of the large shall prevail; ③ round steel and flat steel connection, the lap length should not be less than six times the diameter of the round steel, double-sided welding; ④ flat steel and steel pipe and grounding device installation requirements: ③ round steel and flat steel connection, the lap length should not be less than six times the diameter of the round steel, double-sided welding ④ flat steel and steel pipe, flat steel and angle welding, should be close to the surface of the 3/4 steel pipe, or close to the outside of the angle on both sides, on both sides of the welding; ⑤ in addition to buried in the concrete welded joints, all other should be corrosion-resistant measures. Do not do the above specifications, will not be accepted.
(5) equipotential connection
①, the total equipotential connection (meb) "Low-voltage Power Distribution Design Code" requires: the use of ground-fault protection, in the building should be the following conductive body for the total equipotential connection: pe, pen trunking; electrical device grounding pole grounding trunking; building water pipes, gas pipes, heating and air conditioning ducts and other metal piping; conditions permit. Conductive body of the building metal fixtures and so on. The above conductive body should be connected to the total equipotential connection terminal in the building, equipotential connection in the metal piping connections should be reliably connected to conduct electricity. Equipotential construction, the general use of welding, will be xmm × xmm galvanized flat steel, from the meb copper connection busbar connected to the conductive body. For a variety of metal pipe coupling hoop, generally should be used not less than xmm × xmm galvanized flat steel or copper tape.
②, the bathroom local equipotential connection x Article 6 requirements: ` bathroom with bathing equipment should be made equipotential connection. c District requirements construction method is to use xmm xxmm flat steel to the ground xcm to do a one week to the belt type, and then make x need to be grounded on top of the xmm xmm screws *** grounding object to use. Mainly control the connection with its lead wire.
④ flat steel and steel pipe, flat steel and angle welding, should be close to the surface of the 3/4 steel pipe, or close to the outside of the angle on both sides, on both sides of the welding;
⑤ In addition to buried in the concrete welded joints, all other should be corrosion-resistant measures. Do not do the above specifications, will not be accepted.
Third, the emergence of engineering quality problems in a timely manner
Construction without drawings, construction without a license, multiple subcontracting, dependency, construction management is not in place, the use of unqualified raw materials, over-sized poor slotting and drilling, unqualified holes, weakening of load-bearing cross-section of the construction, the superintendent found that it should be timely to stop the construction, serious or do not listen to the superintendent verbally stop the construction. If the supervisor does not listen to the verbal stopping, the supervisor may issue a notice of temporary stoppage of work. The small quality problems in the construction of the project, as far as possible in the inspection of the construction site to solve and in the sub-projects, divisions of the acceptance process in a timely manner. For the general can be reworked, repair the quality defects of the project, the contractor should be instructed to write a report on the quality of the first, explain the situation and put forward treatment, after the supervision engineer to verify and study, if necessary, after the construction and other units recognized to determine the treatment program, approved by the contractor to deal with the treatment of re-acceptance after processing.
Fourth, data collection, organization
Construction in a timely manner to collect relevant information, complete, complete, and synchronized with the project, the completion of the binding, filing requirements.
#1 generator set overhaul since April 25, 20xx to the end of June 18, lasted 55 days. The overhaul period is short, the task is heavy, the overhaul found and dealt with a lot of problems. In dozens of days of intense construction, all electrical repair personnel in line with the policy of safety first, and overhaul equipment should be repaired, repair must be repaired, the principle of good, subject to a number of objective constraints in the case of the wisdom of the set, to master the flexibility of the work methods, in practice, the application of the results achieved promising results. Through all electrical professionals *** with the efforts of the overhaul schedule listed in the standard project, non-standard project cut-off has been completed today, no one missed, and acceptance.
Electrical repair professional
A plan to overhaul the standard project
1, generator and excitation system 48, the actual start and completion of 48, and by the acceptance of the acceptance of the program by level;
2, the main transformer 16, the actual start and completion of 16, and by the acceptance of the acceptance of the program by level
3, high-voltage plant variable, high-voltage desulfurization variable part of 18 items, the actual start and completion of 18 items, and by the acceptance of the gradual acceptance procedure qualified
4, # 610 switching interval 13 items, the actual start and completion of 13 items, and by the gradual acceptance procedure qualified
5, 6KV transformer and distribution of primary equipment, 19 items, the actual start and completion of 19 items, and by the gradual acceptance procedure qualified
6 6kv motor, inverter and its cables, 6kv motor *** 31 overhaul, the actual start and completion of 31 units, and by the level-by-level acceptance procedures for trial run qualified
7, 380v system 4 items, the actual start and completion of 4 items, and by the level-by-level acceptance procedures for qualified 8, DC system and UPS *** 2 items, the actual start and completion of 2 items, and by the level-by-level acceptance procedures for qualified 9, desulfurization and de-ash removal part of 4 items, and by the level-by-level acceptance procedures for qualified 9, desulfurization and de-ash removal part of 4 items. and in addition to the ash part of the 4, the actual start and completion of 4, and by the acceptance of the acceptance process by level 10 combustion part of 5, the actual start and completion of 5, and by the acceptance of the acceptance of the acceptance of the acceptance of the process by level
Second, non-standard projects, technical improvement projects 10
Third, supervision of the work of the abstract
In the overhaul process, electrical professional supervision engineers in accordance with the supervision rules, honesty, law-abiding, impartiality, scientific eight-pronged approach to work: from beginning to end of the overhaul of the power plant # 1 machine electrical equipment to implement the whole process of construction tracking acceptance, visa; the generator main equipment, the implementation of the important ancillary equipment on-site inspections, visas; notification of the supervisory knowledge of the event, the to be sure to go to the witness to witness, no omission. The company's main business is to provide the best service to the customers.
1, #1 generator on May 11, pumping rotor process supervision found that the rotor groove wedge hopper more than in the operation of the foreign body impact damage, and later found that the rotor groove wedge of the hopper there are about 800 more than damage to the stator core groove wedge there are about 300 more than the damage to the stator cleaning detected a broad bean size of an iron, and the rotor groove wedge aluminum alloy debris more than a few pieces of the HEC plant on May 19, began to repair on June 14th re-pumping rotor, and the rotor groove wedge, the rotor groove wedge, the rotor groove wedge aluminum alloy debris more than one piece of the rotor groove wedge. On May 19th, HAECO started to repair the rotor, and on June 14th, the rotor was re-pumped to deal with the rotor guard ring not in place, and all the generator overhaul work lasted for 27 days.
Handling
Stator: stator slot wedge 1-5 wind area of all slot wedge re-strike, cushion, slot wedge, wind area partition, rubber, fastening copper screws replacement, stator iron loss test, according to the iron loss of hot spots, iron core silicon steel filler mica sheet, coated with insulating varnish for treatment, repeated tests to eliminate defects, until qualified. Stator surface potential test, the surface potential of abnormalities in the tightening treatment by the acceptance of the gradual acceptance of the program qualified.
Rotor: rotor pull out the steam excitation at both ends of the large protective ring, lifting out the two poles of 16 groups of coils, each group of coils through the slot box voltage, coil inspection, interlayer insulation treatment, shaping, put back into the slot. Among them, the 25th slot box was damaged, and a pair of slot boxes was replaced, and the damaged slot wedges were given abrasion and coloring inspection according to the damage degree, and the more damaged ones were replaced, and the guard ring and fan ring were inspected by inspection. Weighing and counterweighting the slot wedge, drying and cleaning the slip ring leads. DC resistance, voltage resistance test, rotor airtightness test, rotor wind bucket ventilation test, all tests qualified, theoretical counterweight balance, the set meets the requirements of the acceptance process by level by level qualified.
2, #1 generator set overhaul process, **** visa secondary equipment quality acceptance of 223 items, 86 items of tertiary acceptance, hidden works visa 45 items, special acceptance visa 105 items. The #1A slurry circulating pump and #1C electric feed pump were returned to the factory for overhaul.
Generator neutral 3G124TV three-phase replacement, the prototype number for the JDZX8-20V, the current model for the JDZX4-20. generator excitation end of the hydrogen cooler water leakage of copper tubes, replacement of the same type of spare parts.
220kV part of the isolation switch GW7-220 (W) dynamic and static contact replacement. #01 start and standby transformer porcelain vase add umbrella skirt, and spraying silicone paint.
A, B, D row powder machine motor, ash pump three groups of first-class motor, B induced draft fan motor five high-voltage motor slot wedge missing more, make up for replacing the slot wedge and painted with insulating paint.
3, issued by the supervision of the work of the contact list of three, five assessment sheets, review and recommended amendments to the operating instructions generator pumping through the rotor each one. Generator stator cooling water circuit hydraulic test a generator repair before and after the test program a refusal to sign the generator rotor groove wedge loosening, wear rotor hidden works visa. Stop the pumping generator rotor unauthorized operation once, pointed out that the generator installation PT is not connected to the mother row once, pointed out that the 220kV booster station scaffolding staff two hand holding 6-meter-long steel pipe once, violating the safety regulations once, pointed out that there are unsafe factors in the equipment 4 times.
4, in the overhaul process, the electrical professional supervision engineers in accordance with the supervision rules, honesty, law-abiding, fair, scientific eight-pronged approach to work: from beginning to end of the overhaul of the power plant # 1 machine electrical professional equipment to implement the whole process of construction tracking acceptance, visas; the generator's main equipment, the implementation of the important ancillary equipment on-site inspections, visas; notification of the supervisor to know the event, the must be, the witness must witness, no omission. The company has also implemented on-site inspections and visas for the main generator equipment and important ancillary equipment.
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