Sense of care for the explosion-proof box at high temperature

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During the reconstruction of rural power grids, the number of distribution boxes required at the time was large and the construction period was short. The distribution box manufacturers needed urgent and large quantities of low-voltage electrical appliances. As a result, the requirements for product quality were not strict, resulting in Some products failed shortly after they were put into operation. If some types of AC contactors were put into operation shortly after the distribution box was put into operation, they could not be operated because the contactor closing coil was burned out.
1.3 Failures Caused by Improper Selection of Electrical Equipment in the Distribution Box
Due to the improper choice of AC contactor capacity in manufacturing, AC contactors of the same capacity are installed for different outlet loops, and the unbalanced three-phase load is not taken into consideration, and the current rating of some outlet contactors cannot be normal. On the basis of the selected model, an increase in the choice of the current level results in the occurrence of AC contactor burnout during the summer hot season operation.
Above, we told you the reason why the explosion-proof power distribution box failed. Then how to improve the explosion-proof power distribution box? Next, I'll tell you about the improvement plan of the explosion-proof power distribution box, specifically the following points:
2.1 For distribution box with distribution transformer capacity of 100kV·B and above, the temperature control relay (JU-3 or JU-4 subminiature temperature relay) shall be installed in the side wall of the heat dissipation window inside the box. The axial fan is installed on the box on the left side above the control electrical panel so that the exhaust fan can be automatically activated when the temperature inside the box reaches a certain value (for example, 40°C), and heat is forcibly exhausted to dissipate the heat of the cabinet.
2.2 The use of protection circuit to prevent the external box circuit breaker power supply from occurring. Choose a small-sized intelligent phase loss protector, such as the optional DA88CM-II motor phase loss protection module (Shanghai products) installed in the distribution box to prevent the motor from being burned out due to low-voltage phase-to-phase operation.
2.3 Improve the connection mode of the low-voltage capacitor bank of the original explosion-proof distribution box, and change the installation position from the AC contactor's pile head to the connection between the low voltage line of the distribution box and the meter. To prevent the metering device from measuring inaccurately due to a lack of phase fault in the capacitor circuit during operation or damage to the capacitor. In addition, the capacitor selection model should be BSMJ series products to ensure reliable and safe operation of components.
2.4 If a new distribution platform is installed on the column, a 2 mm thick stainless steel plate can be selected when the distribution box is manufactured, and the size of the distribution box can be enlarged proportionally (in JP4-100/3W type used in agricultural reform projects. On the basis of this, an increase of approximately 100 mm in the width dimension of the original tank, ie the change from the original 680 mm to 780 mm, the improved dimensions of the distribution box: 1300 mm × 780 mm × 500 mm, in order to increase the number of points The electrical safety distance between the outlets, outlets and the enclosure of the enclosure is beneficial to the maintenance and replacement of the fuses by the agricultural electricians, and it can also dissipate heat.

Industrial sectional High Speed Overhead Door

Product Description

Electric Overhead Sliding Door For Logistic
Product Description:
Name Sectional overhead glass panel garage door
Operation way electric /remote/manual
Position garage/shop/auto4S store/Industrial/Garden etc.
Door panel structure
aluminum alloy frame +Tempered Glass / Polycarbonate Glass
/double-glazing

Door panel frame 		material aluminum alloy
thickness 2.0mm
color white, black ,gray, silver gray, wood grain, cream
(any colours can be specified)
surface Treating baking varnish

Thickness of door
panel
40mm/50mm

Core of the door
panel
Tempered Glass 		5.0`6.0mm thickness ,Full view clear or frosted

Polycarbonate
Glass
5.0mm ~10mm thickness ,Full view clear or frosted
aluminium sheet
9.0mm in thickness,baking varnish with surface
traeting,color like the frame

other tempered
Glass
mirror glass,baking glass and many kind of glass
for your options



choose your glass:
The glass can be use polycarbonate glass( clear or frosted )
and tempered glass (clear or frosted/coated colour /tinted color/mirrow)
5-10mm thickness for glass
>>Tempered Glass - enhanced safety
>>Polycarbonate - superior strength with UV protection

hardware Accessories

Guide rail 		Size 2"/3"
Materail galvanized steel
Thickness 2.0mm
Bracket Materail galvanized steel
Thickness 3.0mm
Hinge Model Finger-protect/normal
Materail galvanized steel
Thickness 3.0mm
Roller Size 2"/3"
Materail galvanized steel/Nylon
shaft Model solid/hollow
Materail galvanized steel
External key lock For independent garage door, this sort of lock allows you to use external key to start the clutch deviceand open the door in case of power failure under the condition that there are no entries or side doors.
Box airbag safety system The door will be automatically to rise If there are any obstacles in the
process of downward

Spring break device
When the spring is broken,the door can auto stop to prevent the door
falling down

Cable break safety system 		Once the cable is broken ,this device will blocked on the guide rails in case of breakage of the steel wire prevent the door falling down
V external reinforcing bars helping to enhance the strength of door panels,1.0mm thickness,
80mm height, with the bars the door can against the Hurricane
Electric Overhead Sliding Door for LogisticElectric Overhead Sliding Door for LogisticElectric Overhead Sliding Door for LogisticElectric Overhead Sliding Door for Logistic

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SHENZHEN HONGFA AUTOMATIC DOOR CO., LTD , https://www.hongfafd.com