Application Of Fuses in Drawer Type Low-voltage Switchgear
Oct 12, 2023
Application of fuses in drawer type low-voltage switchgear
The design and manufacturing of drawer type low-voltage switchgear need to comply with relevant electrical specifications and standards to ensure that it can provide safe, reliable, and efficient energy transmission and distribution.
In this article, we will discuss the overcurrent and short-circuit values of drawer type low-voltage switchgear, which are crucial for the safe operation of the power system and equipment protection.
Overcurrent refers to the current flowing through electrical equipment exceeding the rated current of the equipment. The occurrence of overcurrent may cause equipment overheating, damage, or other safety issues.
Therefore, the design of drawer type low-voltage switchgear needs to consider overcurrent protection measures. According to different equipment specifications and requirements, drawer type low-voltage switchgear usually adopts different types of overcurrent protection devices, such as fuses, circuit breakers, etc
A fuse is a common overcurrent protection device that can cut off the current by fusing its own conductor when overcurrent occurs in a circuit, thereby protecting the circuit and equipment.
The selection of fuses needs to consider factors such as their rated current, voltage level, and installation method. In drawer type low-voltage switchgear, miniature fuses or plug-in fuses are usually used.
A circuit breaker is a more advanced overcurrent protection device that can protect circuits and equipment by mechanically or electrically disconnecting the circuit when overcurrent occurs in the circuit.
The selection of circuit breakers needs to consider factors such as their rated current, voltage level, operation mode, and installation method. In drawer type low-voltage switchgear, miniature circuit breakers or withdrawable circuit breakers are usually used.
In addition to overcurrent protection devices, drawer type low-voltage switchgear also needs to consider short-circuit protection. Short circuit refers to the phenomenon where the current in a circuit flows directly to the power source without passing through the load. The occurrence of a short circuit may cause serious overload, damage, or fire hazards to the equipment.
Therefore, the design of drawer type low-voltage switchgear needs to consider short-circuit protection measures. Common short-circuit protection measures include the use of fast fuses, automatic air switches, etc.
In summary, the overcurrent and short-circuit values of drawer type low-voltage switchgear are key parameters related to the safe operation of the entire power system. It is necessary to select appropriate protective devices and methods based on the specific requirements and application scenarios of the equipment to ensure the stable operation of the power system and the safety of electrical equipment and personnel
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US CLIENTS
| GCS LV Withdrawable Switchgear | ||
| S.N. | Specifications | Yes/No/If any |
| Electrical Panel (Low-voltage withdrawable switchgear cabinet) | ||
| Manufacturer | ||
| Brand | ||
| Type/Model | GCS | |
| Country of Origin | ||
| 1 | Description of Function | |
| 1.1 | It is group of low voltage switchgear withdrawable cabinet that can be operated easily and safely. | |
| 2 | Operational Requirements | |
| 2.1 | Electrical supply can be disconnected manually and automatically during overload and short-circuit. | |
| 3 | System configuration | |
| 3.1 | Low voltage switchgear withdrawable cabinet with all the essential components and copper busbar | |
| 4 | Technical Specifications | Ratings |
| 4.1 | Main circuit rated voltage | 400V |
| 4.2 | Rated frequency | 50Hz |
| 4.3 | Rated insultation voltage | 690V (1000V) |
| 4.4 | Maximum working current of main busbar (copper) | 1000A |
| 4.5 | Rated withstand current of main busbar | 100KA/1s |
| 4.6 | Protection Level | IP40 |
| 4.7 | Operating Mode | Manual and Automatic |
| 4.8 | Metal drawer type | 8E or 16E or Equivalent |
| 4.8.1 | 400A Drawer | 1 No. |
| 4.8.2 | 300A Drawer | 1 No. |
| 4.8.3 | 250A Drawer | 1 No. |
| 4.8.4 | 200A Drawer | 2 No. |
| 4.8.5 | 150A Drawer | 2 No. |
| 4.8.6 | 100A Drawer | 2 No. |
| 4.9 | Outer Dimension | Approx. (80cm X 105cm X 220cm) |
| 4.10 | Each drawer must have 3-digital or analog ammeter to measure 3-phase (R-Y-B) current individually | |
| 4.11 | Busbar must be of copper three phase four wire with protective Earthing (R,Y,B,N,PE). | |
| 4.12 | The MCCB should be of high quality & sensitive | |
| 4.13 | The operating mechanism of the drawers must be easy and smooth. | |
| 4.14 | Drawer Handle must be highly insulated and strong | |
| 4.15 | The outer dimension should approx match to (80cm X 105cm X 220cm) | |
| 4.16 | The outer design and color should match as per the design as shown in picture | |
| 5 | Busbar Tray | |
| 5.1 | The busbar tray must be installed at the top of the compartment of the functional unit, and the connection line and the common power lne can be put in the tray | |
| 5.2 | The required number of Busbar should be connected from existing system to installed cabinet by nut-bolt/ Busbar trunking system as per requirement | |
| 6 | Accessories, spares and consumables | |
| 6.1 | Extra (spare) handle (change-over handle) for each drawer must be provided | 18pcs |
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