GGD low voltage switchgear

Overview

GGD type low-voltage switchgear (AC low-voltage power distribution cabinet) (hereinafter referred to as the device) is suitable for the power distribution of power plants, substations, factories and mining enterprises with AC 50Hz, rated working voltage 400V, and rated working current up to 3200A In the system, it is used for electric energy conversion, distribution and control of power, lighting and power distribution equipment.

The device complies with the requirements of GB7251.1-2005 "Low-voltage switchgear and control equipment part one: type production, test and partial type test equipment" and JB/T5877-2002 "low-voltage fixed closed switchgear" requirements.

The device has the characteristics of high breaking capacity, flexible electrical scheme, convenient combination, series, strong practicability, novel structure and high protection level.

Product model and its meaning

 

 

Use ambient conditions

Indoor installation use.

The ambient air temperature is not higher than +40°C, not lower than -5°C, and the average temperature within 24 hours is not higher than +35°C.

The air is clean and the relative humidity does not exceed 50% when the maximum temperature is 40°C. Higher relative temperatures are allowed at lower temperatures. For example, the relative humidity is 90% at +20°C, but it should be taken into account that moderate condensation may occasionally occur due to temperature changes.

The altitude does not exceed 200m.

The pollution level is 3.

The inclination of the device installation and the vertical plane should not exceed 5 degrees.

The temperature for transportation and storage is -25℃~+55℃, and it can reach +70℃ in a short time (not more than 24h).

When users have special requirements, they can negotiate with the manufacturer.

Basic electrical parameters

 

 

Structural Features

The basic structure of the device is a combined structure, with KS profiles (basic modulus E=20mm) as the main structural parts, and is fastened with self-tapping locking screws and 8.8-grade high-strength bolts. Frame parts and special supporting parts are supplied by the designated steel production plant to ensure the accuracy and quality of the cabinet. The components of the device are designed according to the modular principle, and have 20mm module mounting holes. The general coefficient is high, which can not only shorten the production cycle, but also improve the work efficiency.

Fully considering the heat dissipation problem in the operation of the cabinet, there are different numbers of heat dissipation holes and slot holes at the upper and lower ends of the cabinet. When the electrical components of the cabinet wind are heated, the heat rises and is discharged through the upper slot, while the cold air is continuously replenished into the cabinet through the lower slot, so that the sealed cabinet forms a natural ventilation channel from bottom to top to achieve heat dissipation and purpose.

The cabinet door is connected to the frame with a hinged hinge, which is convenient for installation and disassembly. A "mountain"-shaped rubber strip is embedded in the folded edge of the door. When the door is closed, it has a certain compression stroke with the strip between the door and the cabinet frame, which can prevent the door from directly colliding with the cabinet, and also improve the door and Protection class.

The top cover of the cabinet can be removed when needed to facilitate the assembly and adjustment of the main busbar on site.

A special ZNJ type combined busbar clamp is designed. The busbar clamp is made of high-strength, high-flame-retardant alloy material thermoplastic, with high insulation strength, good self-extinguishing performance, and unique structure. It can be easily combined with single busbar clamp or double busbar clamp only by adjusting the building block.

The dimensions of the unit are shown in the table below

 

 

Product Completeness

A. Packing list;

B. Instructions for use of the product;

C, product certificate;

D. Factory test report;

E. Relevant electrical drawings;

F. List of spare parts and special tools to be provided;

G. The information that must be provided by the contract may be.

User needs to provide data

A. Main circuit scheme diagram or single-line system diagram;

B. Auxiliary circuit schematic diagram or wiring diagram;

C. List of components in the cabinet;

D. Arrangement diagram and distribution room floor plan;

E. Other special requirements that are inconsistent with the normal use of the product;

F. Cabinet color.

Installation and use

After the device arrives at the place of delivery, first check whether the package is intact or not. If any problem is found, the relevant department should be promptly notified to find out the cause. For products that are not installed immediately, they should be placed in an appropriate place according to the normal conditions of use.

The installation of the device should be carried out according to Figure 1 and Figure 2, and the basic channel steel and bolts (M12) should be prepared by the user.

After the device is installed, the following items should be checked and tested before it is put into operation; manual operation of various switches should be flexible and no abnormality

All stuck phenomenon;

A. Whether the electrical equipment and control wiring installed in the device meet the requirements of the factory's drawings;

B. Check whether the insulation resistance of the main circuit and control circuit meets the specified requirements:

C. Check whether the installed electrical equipment is in good contact and whether it meets its own technical requirements;

D. Check whether the action of the mechanical interlocking mechanism and the electrical interlocking device is correct and reliable, and should meet the system requirements;

E. Check whether there are foreign objects inside the device and whether the mounting screws of the components are loose.

 

 

Main circuit scheme diagram