Low-voltage distribution panel
Products for converting and configuring electrical power
The low-voltage distribution cabinet is designed for a power distribution system with an AC rated current of 50Hz and a rated voltage of 380V, used for power, lighting, and power distribution energy conversion and control. This product features strong breaking capacity, good dynamic and thermal stability, flexible electrical design, convenient assembly, strong series and practicality, and innovative structure.
Current Development Status
1: Low-voltage complete switchgear and control equipment, commonly known as low-voltage switchgear, or low-voltage distribution cabinet, refers to a complete set of electrical equipment with alternating or direct current voltages below 1000V.
Our low-voltage distribution cabinet market has been maintaining a rapid growth momentum with the construction of smart grids, infrastructure development, manufacturing investments, and the advancement of the new energy industry.
3: Data shows that in 2010, the total sales of low-voltage distribution boxes in China reached 10.633 billion yuan, with a year-on-year increase of 11.2%; in 2011, the total sales of the low-voltage distribution box market in our country reached 11.96 billion yuan, with a year-on-year increase of 12.5%.
In the favorable market environment for low-voltage distribution cabinets in our country, internal industry competition is bound to intensify. Suppliers offering the next-generation low-voltage integrated equipment and system solutions will gain a competitive edge in the future market. Only products with the aforementioned features can secure a certain advantage in future competition, thus capturing the high ground of the fourth-generation low-voltage electrical products.
Product Categories
GCS container
Primary Structure
The main structure is made of 8MF type open steel sections, with installation holes of 9.2mm diameter on the side, with module diameters of 20mm and 100mm respectively.
2: The functional compartments of the device are isolated from each other, divided into functional unit rooms, busbar rooms, and cable rooms. The functions of each room are independent.
3: The horizontal main busbar is arranged in a flat placement behind the cabinet to enhance its resistance to electromagnetic forces.
The design of the cable compartment facilitates easy up and down entry and exit for cables.
Functional Unit
Drawer height modular is 160mm, unit circuit rated current 400A and below
GCK Container: (MCC)
Primary structure
GCK(L) Type Low-Voltage Distribution Box
GCK(L) Type Low-Voltage Distribution Box
The basic structure of the cabinet is a modular assembly. Bolted connections, with 20mm modular mounting holes, separate each functional compartment. The fundamental feature of the GCK cabinet is that the busbar is located at the top of the cabinet, with its compartments divided into the functional unit compartment (in front of the cabinet), busbar compartment (at the top of the cabinet), and cable compartment (at the back of the cabinet). It can also be mounted against a wall, in which case, the right side of the cabinet is widened by 200mm to accommodate the cable compartment, making it similar to the top busbar style of the MNS cabinet.
Function Unit
Drawer shelf height module of 200mm
MNS Container: (MCC)
Primary structure
MNS type distribution cabinet
MNS type distribution cabinet
1: The basic structure of the cabinet is assembled from C-shaped sections. The C-shaped sections are bent steel plates with mounting holes at a modulus of E=25mm.
2: The pull-out MCC cabinet is divided into three compartments, which include the functional unit compartment (on the left side in front of the cabinet), busbar compartment (at the rear of the cabinet), and cable compartment (on the right side in front of the cabinet). Since the horizontal busbar compartment is at the back, it can also be designed as a double-sided cabinet.
3: Designed to reduce the width of switchgear arrangement, the rear outlet design of the switchgear has the main busbar horizontally installed at the top of the switchgear, with the rear half serving as the cable room. At this point, it is similar to the busbar style of the GCK cabinet.
GGD Container: (ESS)
Electrical Performance:
1) Basic Electrical Parameters
GGD Type Low-Voltage Distribution Box
GGD Type Low-Voltage Distribution Box
A) Rated Insulation Voltage: AC 660V (1000V) B) Rated Working Voltage: Main Circuit: AC 380V (660V); Auxiliary Circuit: AC 380V (220V), DC 220V (110V)
C) Rated Frequency: 50Hz
D) Rated Current: ≤4000A
E) Rated Peak Current Tolerance (0.1s): 105KA
F) Rated Short-Time Current Tolerance (1s) 50KA
The GCK series of AC low-voltage distribution boxes is recognized as a new energy-saving product by the state. It boasts an advanced control center structure, an aesthetically pleasing design, high electrical performance, high protection grade, and safety and reliability. It's also easy to maintain, making it an ideal power distribution unit for low-voltage power supply systems in industries such as metallurgy, petrochemicals, chemical engineering, electrical machinery, and light industry.
Key Technical Performance
b) Rated Working Voltage: 380V, 660V
c) Frequency of Use: 50Hz
d) Rated Current: Horizontal Busbar System 1600-3150A, Vertical Busbar System 400-800A
e) Rated Short-Time Current Tolerance: Horizontal Bus 80KA RMS/1 second, Vertical Bus 50KA RMS/1 second
f) Rated Peak Current: Horizontal Bus 175KA, Vertical Bus 110KA
g) Function unit interruption capacity: 50KA
h) Peripherals Protection Class: IP40
PGL cabinet:
The PGL type AC low-voltage distribution cabinet is suitable for power users such as power plants, transformer stations, and industrial and mining enterprises. It is used in AC 50Hz distribution systems with rated working voltage of 380V and rated current up to 2500A for power conversion, distribution, and control of power, lighting, and distribution equipment. This product has a high breaking capacity, with a rated short-circuit current withstand of 50kA.
This product complies with the standards IEC 439 for Low-voltage switchgear and controlgear, GB 7251 for Low-voltage switchgear and controlgear, etc.
The PGL distribution cabinet is an indoor installation, low-voltage power distribution unit with open-type double-sided maintenance. The basic structure of the cabinet is composed of steel plates and angle steel welded together. There is a door in front of the cabinet, and an instrument panel above the cabinet, which is a removable small door for installing indicator instruments. The cabinets assembled in parallel have partitions between them, reducing the possibility of an accident expanding due to a fault inside a single cabinet. Above the cabinet's rear frame, there is a main busbar installed on a sub-insulating frame, with a busbar protective cover to prevent metal objects from falling above and causing a serious main busbar short circuit. The neutral busbar is mounted on insulators below the cabinet, and the main grounding point of the grounding system is welded below the frame. The instrument door also has a grounding point interconnected with the housing.
PGL Type AC Low-Voltage Distribution Boards are divided into: Low-Voltage Metering Cabinets, Low-Voltage Incoming Line Cabinets, Capacitive Compensation Cabinets, Grid-Side Power Generation Conversion Cabinets, Bus Coupling Cabinets, and Low-Voltage Outgoing Line Cabinets.
Primary Technical Parameters:
Rated Voltage: AC 380V
Rated Breaking Capacity:
PGL1：15KV
PGL2: 30KV (all are RMS values)
Rated voltage of auxiliary circuit:
AC220V、380V
DC110V、220V
Rated Current:
2000A，2500A
Maintenance Instructions
Maintenance of low-voltage distribution cabinets primarily ensures their normal and safe operation. An annual comprehensive inspection and maintenance of low-voltage distribution cabinets is required. Repairs should be completed with minimal downtime, typically scheduling the owner's planned power outage in advance.
Maintenance Contents and Steps for Low-Voltage Distribution Panels:
1: During maintenance, start from the low-voltage side of the transformer. After the power distribution cabinet is de-energized, clean the dust inside, check if the busbars and connections are secure, look for any signs of overheating or discoloration at the joints, inspect the cable ends and terminal connections for stability and reliability, check for rust on the grounding wires, and ensure the terminal connections are tight. All secondary circuit connections should be reliable, with insulation meeting the required standards.
2: When inspecting the drawer-type switch, the drawer should operate smoothly upon insertion or extraction, with a reliable mechanical lock. Check if the operating mechanism of the automatic air switch on the drawer cabinet is properly positioned and if the wiring screws are tight. Clean the contactor terminal surfaces and surrounding areas. Inspect the contactor terminal contact for integrity; if the contact is poor, lightly file the terminal surface as necessary. If the terminals are severely burned (worn down to 1/3 of the original thickness), they should be replaced. The power indicator gauge and indicator lights are in good condition.
3: When inspecting the capacitor cabinet, first disconnect the main switch of the capacitor cabinet. Use a wire with a cross-sectional area of over 10mm² to discharge each capacitor to ground individually. After visual inspection, ensure the housing is in good condition with no oil leakage. If the capacitor housing swells, it should be addressed promptly by replacing the discharge device, control circuit wiring screws, and grounding equipment. After closing the circuit, adjust the indicator and automatic compensation sections.
4: Maintenance of circuit breakers in switchgear and联络cabinets: First, disconnect all loads and then manually withdraw the circuit breaker using the handle. Re-tighten the wiring screws and check if the spring force of the blade is as specified. Inspect for any cracks or damage in the arc extinguishing grating. Manually adjust the mechanical interlock to ensure accurate opening and closing. Check if the contacts are making good contact, and if necessary, file the contact surface. Inspect the internal springs, washers, and screws for looseness, deformation, or detachment.
Transformer cabinet maintenance:
1: Prior to operation, follow these steps: disconnect the loads on the low-pressure side one by one, trip the circuit breakers on the high-pressure side, close the grounding switch, and securely lock the high-voltage switchgear cabinet. Then, affix a "Do Not Close, Personnel Working" sign on the switchgear handle. Use a 10mm² or thicker wire to short-circuit the busbars and hang the grounding wire, and tighten the busbar screws.
2: Maintenance Operation Steps: Clean the busbar contact area thoroughly and apply electrical composite grease. Secure it with new spring washers and screws. Inspect for any abnormalities in the insulators and spacing connections between busbars. Check the reliability of the connections at the secondary winding terminals of the current, voltage, and transformer.
3: Pre-power supply inspection and testing: Remove all ground wires and jumper cables, check for any tools left at the work site, confirm there are no issues, then close the isolation switch, disconnect the high-voltage side ground switch, close the high-voltage side circuit breaker of the operating transformer, remove the signboard, supply power to the transformer, then close the circuit breaker of the low-voltage side receiving cabinet, supply power to the busbar, and finally close the relevant interconnection cabinets and automatic air switches of each branch.
Cautionary Notes:
1: A dedicated supervisor must be on duty during the maintenance process.
2: Electrical testing is required prior to work.
3: Maintenance personnel should be familiar with and operate the electrical mechanical interlock system of the entire distribution cabinet.
4: During maintenance, be sure to find out which lines are powered by dual lines.
When inspecting busbars, ensure that the residual charge in the lines is fully discharged.
Inspection Process
The inspection process for low-voltage distribution cabinets is divided into two parts:
Firstly, the structural part inspection, which is the inspection of the cabinet dimensions, and it's sufficient to conduct random checks for standard cabinets.
Secondly, electrical inspection is required. Firstly, according to the technical drawings, check the component models, verify the torque of the connection points, and make markings (this task is quite labor-intensive and requires a full check). At the same time, pay attention to the creepage distance and the inter-phase distance to ensure they meet the standards, and check if the wiring complies with the company's process requirements. Then, verify if the main circuit and control circuit are correct, primarily using a multimeter to measure the lines. Next, perform an electrical function test to see if it meets the drawing requirements. Whether it passes or fails, a test report must be issued. The qualified items are labeled and shipped, while the不合格 ones are returned for correction.
Cabling
1. Location: To ensure the normal and safe operation of low-voltage distribution cabinets, the location of the low-voltage distribution room should be close to the load center. The placement area should be free of dust and corrosive substances; otherwise, they should be cleaned promptly. For safety, the environment should be relatively dry, and the placement should minimize vibration.
II. Layout of Power Distribution Equipment: The arrangement of power distribution equipment in low-voltage distribution rooms must prioritize safety, reliability, applicability, and economy. It should also facilitate installation, operation, handling, maintenance, testing, and monitoring. Adequate spacing and exit pathways must be provided in the same room for both low and high-voltage electrical equipment areas and arranged rows of distribution cabinets. Necessary safety measures should be taken when arranging power distribution equipment, such as shielding or placing live conductors with hazardous potentials out of reach. If it's difficult to use shielding or outer covers, protective barriers can be used instead.
III. The layout of the power distribution lines should meet the following conditions: comply with the environmental characteristics of the placement location, align with the features of the building, consider the moderate distance between people and the lines, account for mechanical and electrical stresses that may arise due to short circuits, and consider other stresses that the wiring may encounter during installation and use, as well as the weight of the conductors.
Four: Factors affecting the layout of power distribution lines: Prevent external heat from affecting use, prevent water entry from affecting use, prevent external mechanical damage from affecting use, prevent dust accumulation on wiring from affecting use, and prevent strong radiation from affecting use.
