Industry Information

ExistElectromechanical installation engineeringDuring installation, equipment commissioning, testing, trial operation, and acceptance are important steps in project management for electromechanical equipment installation.

In particular, many small and medium-sized electromechanical equipment are frequently used in electromechanical installation projects. Although small in size and relatively simple to install and debugg, it has many supporting components and corresponding standards; The installation and commissioning of large-scale electromechanical equipment involves more coordination and management of personnel, machinery, materials, and energy, which brings objective difficulties to the installation and commissioning of such equipment. This article summarizes common technical issues encountered in the installation and commissioning of electromechanical equipment, in order to better promote the resolution of installation problems in the engineering field.

With the improvement of standardization and modernization of production equipment, especially the application of automated equipment, the installation and commissioning process of electromechanical equipment is becoming increasingly complex and specialized. The equipment installation major is gradually shifting toward technology-intensive development, which has greatly hindered the construction cycle of electromechanical equipment installation projects.

This requires the installation schedule of electromechanical equipment to carefully consider the time forecasts for each process, balancing engineering production and technical commissioning needs. Generally speaking, common electromechanical installation issues mainly include the following points:

1) Bolt connection issues.

Bolt connections are a basic component in electromechanical installation, but their operation is not normal. If the connection is too tight, due to long-term electromagnetic and mechanical forces, the bolts may experience metal fatigue, leading to loosening of components such as shear and screw thread slippage, and creating potential accident hazards. Especially for bolted connections involving conductive current in electrical engineering, it is important to address the mechanical and heating effects between bolts and nuts, compacting them to avoid increased contact resistance after compaction, which can cause heating contact oxidation, increased resistance, and a series of chain reactions that could lead to overheating, burnout, grounding short circuits, or wire breakage.

2) Vibration issues.

The causes of vibration problems generally include three aspects:

(1) Pumps are mainly caused by factors such as bearing clearance, poor concentricity between rotor and housing, or friction between rotor and stator.

(2) Motors, whose causes include large bearing clearance, rotor imbalance, or uneven air gap with the stator.

(3) Installation operation: If the operating parameters deviate too much from the rated parameters, it can easily cause unstable pump operation, such as vibration caused by unstable flow control at the outlet valve. Therefore, the installation process should be as close to the rated parameters as possible.

3) Overcurrent issues.

In this case, there may be three possible reasons: pump bearing damage, foreign objects inside the equipment; Low motor overload current setting, high circuit resistance; Due to high density or viscosity, the medium used in mechanical and electrical installation engineering processes is greater than the pump's design.

4) Electrical equipment issues.

(1) Errors during the assembly of the pressure regulating device or chips falling into the mechanism. If not addressed promptly, safety accidents of varying degrees can occur.

Due to negligence in installation and maintenance, the current transformer windings remain in an open and closed state, resulting in excessive overvoltage and endangering personal and equipment safety.

(3) Improper installation and operation of isolating switches can lead to insufficient contact pressure and contact area between stationary and stationary contacts, leading to electrical oxidation of the contact surfaces and increased resistance, which can lead to contact erosion accidents.

The main transformer insulation is damaged or broken. Installation errors in sealing devices directly affect changes in the insulation strength of the main transformer, and are very likely to cause local insulation damage or breakdown, resulting in serious accidents.

(5) Incorrect arc contacts and contact assemblies of the circuit breaker, with the same insertion stroke, contact pressure, and cycle, and the switching speed not meeting requirements, leading to the decomposition of the insulating medium and a sharp increase in pressure, which can lead to circuit breaker explosion accidents.