Low voltage switchgear is suitable for power plant, petroleum, chemical industry, metallurgy, textile, high-rise building and other industries, as power transmission, distribution and power conversion. The products meet the requirements of gb7251.1-2013 "low-voltage switchgear assembly" (IDT iec60439-1 1999). Baoding zhongyi electric comprehensive analysis of switchgear low-voltage product equipment.

Definition of switch cabinet low voltage

A combination of one or more low-voltage switchgear and related control, measurement, signal, protection, adjustment, etc., which is completed by the manufacturer of all internal electrical and mechanical connections and which is assembled in its entirety with structural components.

Function and function of low voltage switch cabinet

1. Electric energy distribution and conversion;

Motor control; 3.

3. Reactive power compensation;

4. Protect the person from electric shock (direct and indirect contact);

5. Protect the equipment from external environmental influences;

Three, switchgear low-voltage three important standards

1, the standard GB7251.1

Low-voltage switchgear and control equipment

Part I: type test and partial type test equipment

2, IEC60439.1

Low-voltage switchgear and control equipment

Part I: type test and partial type test equipment

3, GB/T 15576-2008

Low-voltage complete reactive power compensation device

Switch cabinet low-voltage classification

1. According to structure:

Fixed: PC or MCC circuit;

Extraction: PC or MCC circuit;

2. By purpose:

Power distribution cabinet (PC:Power Center);

Control: MCC:Motor Control Center;

Compensation: such as reactive power compensation cabinet (capacitor cabinet).

Five, switchgear low-voltage main components

1. Cabinet body: shell framework, internal installation and supporting parts of the switch cabinet;

Bus: a low impedance conductor which can be connected to several circuits separately;

3. Functional unit: all electrical equipment and mechanical parts (including incoming unit and outgoing unit) that perform the same function.

Main parameters of switch cabinet low voltage

1. Rated current (usually the same size as the incoming switch);

2. Rated voltage/rated insulation voltage (400/1000v);

3. Incoming and outgoing mode;

4. Rated short-term withstand current (Icw/1s);

5. Division of functional areas inside the cabinet (isolation mode);

6. Shell protection grade;

7. Installation location and method;

8. External dimension (related to the user's site area);

9. Color and surface treatment;

10. Grounding system;

Seven, switch cabinet low-voltage installation location and installation method

1. Classification of installation site:

Indoor installation;

Outdoor installation;

2. Classification of installation methods:

Install against the wall;

Installation from the wall;

3. Classification of fixed mode:

Bolt fixing;

Welding fixation;

8. Low-voltage color and surface treatment of switchgear

1. Each cabinet type has its own standard recommended color

2. It can also be determined according to the requirements of users;

3. Surface treatment;

A. spray painting;

B. Epoxy resin electrostatic powder spraying;

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