Specific installation instructions for reactors
By Yang Qiang
March 15th, 2025
294 views
Installation instructions:
1. The dry-type hollow reactance is installed on a cement foundation. The cement foundation should be pre embedded with ground leveling iron as required and rooted in the foundation. The number of ground leveling iron and its distribution circle diameter should be confirmed according to the external installation drawing. The ground leveling iron and grounding wire should not form a closed loop.
2. Requirements for surrounding magnetic field: The magnetic clearance distance should be within a radius of twice the diameter of the reactor center and in a vertical position, and there should be no metal closed loops present. On the basis of meeting the above requirements, the minimum magnetic influence distance between adjacent reactor axes is 1.7D: the minimum magnetic influence distance of the reactor axis relative to the surface of the metal component that does not form a closed loop is 1/2D, and the minimum magnetic influence distance of the reactor coil end to the ceiling and ground of the installation site is 1/2D. Note: D is the outer diameter of the reactor.
3. The installation location can be indoors or outdoors, and there should be good ventilation conditions for indoor use.
4. The reactor must be installed according to the installation method and phase sequence position specified in the design, and cannot be changed arbitrarily.
5. After the installation of the reactor is confirmed to be correct, if there is a gap between the support at the lower end and the flat iron on the foundation, a small iron plate should be used to plug it tightly, and then the two should be welded firmly or locked with appropriate screws by electric welding.
Installation process:
1. Process standards
⑴ The pillar is intact, without cracks, and securely fixed; The coil is not deformed and the insulation paint is intact.
The weight of the reactor should be evenly distributed among all post insulators.
The base of the reactor should be grounded, and its pillars should not form a magnetic circuit. The grounding wire should not form a closed loop.
The grounding wire and metal fence of the steel bars and bottom insulators inside the reactor foundation should not form a closed circuit through themselves and the grounding wire.
The fence should be installed flat and firmly, with good anti-corrosion properties, and corrosion-resistant materials should be used. When using metal fences, they should have clear disconnect points and grounding points.
Neutral busbar painted with light blue paint
2. Key points of construction
⑴ Foundation and bracket installation:
1) The offset of the foundation axis and the deviation of the foundation cup bottom elevation should be within the allowable range of the specifications, and the position deviation of the embedded parts should be remeasured according to the design drawings.
2) Steel pipe supports and concrete supports for low-voltage reactors should be equipped with magnetic isolation measures according to design requirements to prevent leakage of the reactor and the formation of circulating currents, which can cause heating and loss of the supports.
3) If there are channel steel components at the bottom of the equipment bracket according to the design drawings, the channel steel components should be connected to the bracket bolts first. During the installation process, the deviation of the top elevation, verticality, axis deviation, top levelness, and spacing deviation of the bracket should be controlled. After adjustment, the bottom channel steel components should be spot welded and fixed to the foundation embedded parts.
4) Taking into account the elevation of the bracket and the length of the post insulator, the elevation error of the post insulator should be controlled within 5mm.
⑵ Reactor installation:
1) When installing the reactor vertically, the center lines of each phase should be consistent.
2) The weight of the reactor should be evenly distributed on all post insulators. When leveling, it is allowed to place steel gaskets under the base of the post insulator, but they should be firmly fixed.
3) When installing the reactor with overlapping upper and lower parts, it should be installed according to the requirements of the product manual.
4) The direction of the wiring terminals of the reactor equipment must be consistent with the direction on the construction drawings.
⑶ Grounding construction:
1) The base of the reactor pillar should be grounded, preferably using non-magnetic materials. The grounding wire of the pillar should not form a closed loop, and should not form a closed loop with the ground grid. Generally, double port equipotential bonding is used for grounding.
2) There should be no conductor closed loop in the magnetic flux circuit.
3) When the rated current exceeds 1500A and above, bolts made of non-magnetic metal materials should be used to fix the lead wires, The distance between the fence and the equipment meets the design requirements.
3. Key points of construction technology
(1) When providing on-site technical services for the product, internal inspection and wiring should be completed by the manufacturer's technical service personnel in accordance with the product manual, contract, and specification requirements, or under the guidance of the manufacturer's technical service personnel.
(2) Before installing the equipment, the foundation and embedded parts should be inspected and retested according to the manufacturer's technical specifications.
(3) The weight of the reactor should be evenly distributed among all post insulators. When leveling, it is allowed to place steel gaskets under the base of the post insulator, but they should be firmly fixed.
(4) Wiring must be carried out according to the design drawings and product drawings, and it is necessary to verify that the design drawings, product drawings, and actual devices are consistent.
4. Main reference standards
Standard for Handover Test of Electrical Equipment in Electrical Equipment Installation Engineering GB 50150-1991
Code for Construction and Acceptance of High Voltage Electrical Equipment Installation Engineering GB 50147-2010
Code for Quality Inspection and Evaluation of Electrical Equipment Installation Engineering (DL/T5161.1~5161.17-2002)
Mandatory Provisions of Engineering Construction Standards Q/GDW248.1-2008
Construction Process Control Specification for State Grid Engineering Q/CSG11105-2008
State Grid Corporation of China Transmission and Transformation Engineering Process Standard Library, Substation Engineering Section 2011
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