GRL DNH7 Fuse Switch Provides Safe Protection for TBEA‘s JP Box
Born to Be Safe
GRL fuse switch provides safe protection for TBEA.
Customer Profile
TBEA is a leading company in the global power transmission and transformation industry, with more than 20,000 employees and 3 listed companies.
In the energy industry, TBEA actively participates in the power grid and green power projects, involving distribution boxes, combiner boxes, jp boxes, switch cabinets, etc.
Temperature Rise Indicator
Feeder pillar is a common cabinet type in the power grid. It is generally used at the lower end of the transformer. The fuse switch is used as the main switch and the MCCB is used as the shunt switch. It plays a role in distributing 380V AC power and is widely used in buildings.
There are strict standards for the temperature rise performance of the JP box. In China, it is generally less than 65K.
TBEA participated in a JP box project, using the international brand fuse switch disconnector as the main switch in the cabinet. However, in the temperature rise test, the temperature rise index reached 75K, which seriously exceeded the qualified standard.
Solution
After connecting with TBEA, the following optimizations were carried out
Replace the GRL DNH7 fuse switch disconnector
GRL 400A fuse switch adopts copper contacts and flame retardant V0 (UL-94) material. The test temperature rise is less than 60K, which is of great help to reduce the temperature rise of the distribution box.
Modify the switchgear layout
Under GRL's suggestion, TBEA changed the JP box scheme. Move the switch position of the 400A fuse down, and the temperature rise data of the high-temperature area in the upper part of the principle box is greatly reduced.
Use a low-power fuse
When the current is overloaded, it will be blown quickly to avoid a large amount of heat from the fuse and ensure safe use.
Customer Use
During the inspection, TBEA used GRL 400 amp fuse switch disconnector for testing. The final temperature rise was less than 65K. As a result, the project went ahead smoothly.
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