Ring Main Switchgear
Ring Main Switchgear
JQHWX-12/24 outdoor ring main box is developed based on the experience of safe and reliable operation of switch branch boxes and combined with distribution network automation system technology. It is suitable for my country's national conditions and represents the domestic advanced technology level. Complete sets of electrical appliances.
Product Overview
In recent years, my country's urban power grid has undergone earth-shaking changes. Most cities have formed or are in the process of forming densely populated areas with numerous electricity loads. Therefore, new power supply The method is through the ring main box/switch, so it has the advantages of no civil construction, small footprint, flexible configuration, reliable power supply method, short construction, installation and debugging time, and low overall cost, and has been vigorously developed.
JQHWX-12/24 outdoor ring main box is developed based on the experience of branch boxes with switches that have been operated safely and reliably and combined with the technology of distribution network automation system. Our country's national conditions, complete sets of finished electrical appliances representing the domestic advanced technological level. JQHWX-12/24 outdoor ring network box installs and debugs the 12kV switch cabinet, power PT cabinet, feeder FTU, RTU, communication control terminal, metering and automatic meter reading, UPS power supply, etc. into a removable, sealed, moisture-proof stainless steel or in non-metal boxes, shortening the construction period and realizing the integration of primary and secondary systems in urban distribution networks and the modularization of assembly.
Technical Parameters
| Item | Unit | Parameters | |
| Rated voltage | kV | 12/24 | |
| Rated frequency | Hz | 50 | |
| Rated current | A | 630 | |
| 1min power frequency withstand voltage | kV | 42/65 | |
| Lightning impulse withstand voltage | kV | 75/125 | |
| Rated short-time withstand current | kA/s | 25/4 | |
| Rated peak withstand current | kA | 63 | |
| Rated peak withstand current | kA | 63 | |
| Rated short circuit making current | kA | 25 (circuit breaker) | |
| Rated Transfer current | A | 1700 (combination appliance) | |
| Rated active load breaking current | A | 630 | |
| Rated closed loop breaking current | A | 630 | |
| Mechanical life | Circuit breaker | times | 20000 |
| Load switch | times | 10000 | |
| Isolation/grounding switch | times | 5000 | |
| Rated inflation pressure (gauge pressure at 20°C) | MPa | 0.04 | |
| Gas relative leakage rate | % | 0.01 | |
| Protection level | IP4X/IP67 | ||
Structural features
The outdoor box has strong corrosion resistance
There are no fasteners on the surface of the outdoor box for disassembly, it has good anti-theft performance and has an IP43 protection level. Strong defensive performance
The top cover is designed as an air sandwich double-layer structure. The outer layer has a drainage angle and no vents; the air inlet is located at the bottom and side of the box, and is equipped with a removable dust filter. Net; bottom-up air convection is formed inside the box, so that the box has good heat insulation and ventilation effects.
The box body is sealed with a sealing strip for the cable entry. It has a windproof device after opening to facilitate the fixation of the door during operation. The door lock has a rainproof structural design.
The switching equipment in the box has been installed and tested properly before leaving the factory. After being transported to the site, the box only needs to be hoisted to the required position. The installation is simple and the area is small.
Product usage environment
Meet the normal use conditions of outdoor switchgear and control equipment in DL/T593:
1. The maximum ambient air temperature does not exceed 40℃, and the average temperature measured within 24 hours does not exceed 35℃. The lowest temperature of the surrounding air is -40℃, and the daily temperature difference is 15-25K
2. Considering the influence of sunlight radiation, the radiation intensity is 1000W/㎡
3. The altitude does not exceed 1000m
4. The ice coating thickness shall not exceed 1mm for level 1, 10mm for level 10, and 20mm for level 20
5. The wind speed shall not exceed 34m/s (corresponding to 700Pa on the cylinder surface )
6. The effects of condensation and precipitation should be considered
7. Vibrations or earthquakes from outside the switchgear and control equipment can be ignored
Installation basic diagram (for reference)
