Three reasons for the failure of the distribution cabinet

Three reasons for the failure of the distribution cabinet:

1. Faults caused by product quality.

In the renovation of rural power grids, due to the large number of distribution boxes required and the short construction period, distribution box manufacturers need to urgently supply a large number of low-voltage electrical appliances, resulting in lax requirements for product quality, leading to some products malfunctioning shortly after production. For example, some types of AC contactors cannot operate soon after the distribution box is put into operation due to the burning of the contactor closing coil.

2. Faults caused by improper selection of electrical appliances in the distribution box.

Due to improper selection of AC contactor capacity during the manufacturing process, AC contactors with the same capacity were installed on different outlet circuits without considering three-phase unbalanced loads, resulting in abnormal selection of current levels for some outlet contactors. On the basis of this model, the selection of current level was added, which resulted in the AC contactor burning out during the operation of the distribution box in the hot summer season.

3. Faults caused by the impact of environmental temperature on low-voltage electrical appliances.

The low-voltage electrical appliances in the distribution box are composed of fuses, AC contactors, residual current operated protectors, capacitors, and instruments. The normal working conditions of these low-voltage electrical appliances are as follows: the upper limit of ambient air temperature does not exceed 40 ° C. The average 24-hour ambient air temperature shall not exceed 35. The lower limit of ambient air temperature shall not be less than -5 ℃ or -25 ℃. If this operation is not followed, low-voltage electrical appliances can easily cause malfunctions.

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http://www.switchgear-china.com/switchgear/high-voltage-switchgear/high-voltage-switchgear-cabinet.html

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Here are our customer examples for your reference

Uzbekistan customer

Datasheet
1.1 710-512-01-MVS1 Main Substation
Incoming Switchgear A01 B01 2
No Components Specification Unit Qty Maker
1 VCB
HVX12-50-31-F 275mm
Altitude ≤2000m
Opening voltage DC220V
Closing voltage DC220V
Energy storage voltage DC220V
Set 1 China
2 VT JDZ-10 10KV/√3/0.1KV/√3 Set 3 China
3 CT
LZZBJ9-12 3000/1A 5P20 10VA
5P20 5VA 5Fs5 5VA
Set 3 China
4 High voltage fuse XRNP1-12 0.5A Pc 3 China
5 Lightning arrester HY5WZ-17/50 Set 3 China
6 Intelligent control panel WY-9008A Pc 1 China
7 Short circuit and ground fault indicator EKL-4-1 Pc 1 China
8 Multifunctional electric instrument PD666-3S3 380V 5A Pc 1 China
9 Primary harmonic eliminator LXQ-12KV Pc 1 Fengyuan
10 Charged display DXN-12Q Pc 1 China
11 Temperature and humidity controller WY-CS-III Pc 1 China
12 Connecting piece JY-2 Pc 3 China
13 Junction box PJ1 Pc 1 China
14 Metering bracket Universal type Pc 1 China
15 Signal lamp ND16-22D/4 AC380V red Pc 1 CHNT
16 Signal lamp ND16-22D/4 AC380V green Pc 1 CHNT
17 Signal lamp ND16-

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