Ring Main Unit With Circuit Breaker

The USUNE XGN15 series Ring Main Unit With Circuit Breaker is a compact, scalable, metal-enclosed switchgear designed for power distribution automation. The entire cabinet uses air insulation technology, balancing safety and compactness, making it suitable for various confined space installation scenarios. Its simple structure and flexible operation significantly reduce on-site construction and subsequent maintenance difficulties, improving power distribution operation efficiency.

As a professional manufacturer with extensive experience, USUNE possesses a complete R&D, production, and testing system. The XGN15 series products are independently manufactured in its own factory, with every step from raw materials to finished products strictly adhering to international standards to ensure consistent and stable product quality.

Core Configuration and Technical Advantages

1.Main Switch Configuration

The main switch in this series, the Ring Main Unit With Circuit Breaker, is an SF6 load switch independently manufactured by USUNE, offering advantages such as long service life, stable performance, and low maintenance costs. It can also be equipped with state-of-the-art vacuum circuit breakers according to user needs, further enhancing the equipment's breaking capacity and protection level, adapting to different power distribution scenarios.

2.Operation Modes and Automation Level

The main switch supports both manual and electric operation modes to adapt to different on-site operational requirements. It can be equipped with FTU and RTU devices, perfectly meeting the "four remote" requirements (remote control, remote signaling, remote measurement, and remote adjustment) of power distribution automation, realizing intelligent monitoring and management of the power distribution system, and laying the foundation for the intelligent upgrade of the power grid.

3.Advanced Technology

Applications Integrating advanced sensing technology and the latest protection relays, it can accurately monitor equipment operating status in real time, quickly respond to abnormal conditions, and ensure the safety of power distribution systems and equipment. Adopting a lightweight and flexible assembly scheme reduces transportation and installation difficulties, while facilitating later maintenance and expansion, meeting the ever-changing power distribution needs of the market.

Application

The Ring Main Unit With Circuit Breaker is suitable for 50/60Hz, 12-36kV power systems, and is widely used in industrial and civil power cable ring networks and power supply terminals. As a professional power distribution equipment supplier, USUNE has optimized the product design, making it particularly suitable for the following scenarios:

- Urban residential power distribution, small substations, switching stations, and prefabricated substations;
- Industrial and mining enterprises, shopping malls, airports, subways, and other public places;
- New energy fields such as wind power generation;
- Key public facilities such as hospitals, stadiums, railways, and tunnels.

In China, the Ring Main Unit With Circuit Breaker has been widely used in various urban and rural power grid renovation projects, receiving consistent praise from users for its stable performance and reliable quality.

Working condition

- Altitude ≤1000mm
- Ambient temperature: 45℃~-35℃, maximum temperature difference ≤25℃
- The average daily relative humidity does not exceed 95%
- The average monthly relative humidity does not exceed 90%
- Seismic capacity: seismic intensity does not exceed 8 degrees
- No violent vibration and shock, fire, chemical corrosion, explosion risk field

Technical Parameters

Enclosure configuration parameter

Incoming LBS

Trafo protect

Metering

Cbog w/.meter

Cb outgoing

Switchgear structure and configuration

Operating mechanism

(1) Double-function single-spring operating mechanism: type K

The switching function is operated independently with a lever or motor.
The ground switch function independently opens and closes using an operating lever, and the operating energy is provided by a compression spring, which is released to close or disconnect the contact.

(2) Double function double spring operating mechanism: Type A

The switching function is operated independently by a lever or motor, and the operating energy is provided by a compression spring, which is released to close the contact. Independent opening and closing operation with button (0) or tripping unit or shunt tripping device.
The ground switch function operates independently with an operating lever and the operating energy is provided by a compression spring, which is released to close or disconnect the contact.

① Busbar room
② Main switch
③ Cable room
④ Operating mechanism, interlocking mechanism and low pressure control room

The whole switchgear cabinet can be divided into upper and lower two units, the upper unit of the cabinet includes the bus room, load switch, operating mechanism room and low voltage room, and the lower unit is separated from the cable room. The entire upper unit can be replaced.

◇ Busbar room

The busbar room is arranged on the upper part of the cabinet. In the busbar room, the main busbars are connected together and run through the whole row of switchgear.

◇ Load break switch

The switch room is equipped with an SFG type sulfur hexafluoride load switch. The shell of the load switch is made of epoxy resin poured, filled with sulfur hexafluoride (SF6) gas as the insulating medium, and the shell is provided with an observation hole. The switch room can be equipped with SF6 gas density meter or gas density with alarm contact according to customer requirements.

◇ Cable room

The load switch cabinet has a spacious cable room, which is mainly used for cable connection, so that single-core or three-core cables can be connected using the simplest unshielded cable head, and sufficient space can also accommodate lightning arrester, current transformer, lower ground switch and other components. According to the standard design, the cabinet door has an observation window and a safety interlock device. Cable room bottom plate with seal cover and appropriate size cable clamp with support bracket. Cable room bottom plate and door frame can be removed to facilitate cable installation.

◇ Operating mechanism, interlocking mechanism and low pressure control room

The interlocked mechanism room also acts as a control panel. The low-voltage room is equipped with a spring-operated mechanism with a position indicator and a mechanical interlocking device, and can also be equipped with auxiliary contacts, trip coils, emergency trip mechanisms, capacitive live displays, key locks and electric operating devices. At the same time, the low-pressure chamber space can also be equipped with control loops, meters and protective relays, and the 750mm wide cabinet has two identical low-pressure chambers for more accessories.

The ring network cabinet equipped with circuit breakers is mainly used as the main power supply in the ring network power supply system, the incoming line cabinet of the standby power supply and the middle section cabinet of the dual power supply system.

◎ XGN15 V module ring cabinet include:

(1) Vacuum circuit breaker
(2) Sulfur hexafluoride circuit breaker
(3) Mechanism and interlock
(4) Grounding switch

◎ Installation method

Front fixed, lateral/side mounted fixed

◎ Main structure

(1) From top to bottom, the instrument room, bus room, load (isolation) switch room, circuit breaker room, cable room.
(2) CT, PT, lightning arrester, grounding switch and relay protection device can be configured according to user needs.
(3) The circuit breaker and the load (isolation) switch can be interlocked.

Operation description

1.Operation of handle:Standing in front of the switchgear, hold up the top of the handle and push forward, the other hand holding the end of the handle to rotate.
2.Make sure that the cabinet door has been properly closed before power supply or separate to grounding.
3.Switch pressure gauge must be checked before power on and power off.

Power on

1.Confirm that the cabinet door is closed.Insert the handle into the upper operating hole and anticlockwise rotate 180°until to hear voice of separating brake.The central indicator of the panel is in position; the lower door is closed and the grounding switch is off.

2.Insert the operating handle into the lower operating hole and clockwise rotate 180°until to hear the closing voice; the central indicator of the panel is in position D; the switch will be on, and then power supply operation is completed.

Power off

1.Switch off:Insert the operating handle into the lower operating hole and anticlockwise rotate 180°until to hear the separating brake voice(Direct use button if there is a button);the center of the panel is in position ,then the switch will be off.

2.Check whether the live display is out to ensuring the cable room is electrically neutral;insert the operating handle into the upper operating hole and clockwise rotate 180°until to hear the closing voice;the central indicator of the panel is in position and the lower door is unlocked;the grounding switch is closed and then power interruption operation is completed.

Transportation and storage

When the switch cabinet is fixed on the bottom plate, it can be shovel by forklift. When it is not fixed on the bottom plate, the switch cabinet should be hoisted or carried as a whole, but it should be transported vertically at any time and should not be overturned to avoid damage to the components in the cabinet. Switchgear (even with outer packaging) should not be stored outside for a long time.

Maintenance

◇ The ring cabinet is maintenance-free for three years under normal circumstances.

◇ The single-spring and double-spring operating mechanisms of the load switch are maintenance-free and do not require any lubrication.

◇ The relay protection device shall be checked according to the manufacturer's requirements before being put into operation.

◇ The maintenance cycle of the ring network cabinet is generally once a year, and specific maintenance measures shall be carried out as follows:

(1) Tighten all electrical connections (main bus, switches, cables, metering instruments) according to the requirements of the installation instructions.
(2) Vacuum all components (main switch, auxiliary switch, trip mechanism, motor, etc.) and conduct appearance inspection.
(3) Perform a single closing/opening operation on all switches, including the ground switch.
(4) Turn on the auxiliary control power supply (do not give the remote control signal) for an electrical sequential operation.

Order goods

The following documents and attachments will be handed over with the cabinet when the switch cabinet leaves the factory:

◇ Product qualified certificate
◇ Product use instructions
◇ Product engineering design data
◇ Switch cabinet accessories:
◇ Each mounting combination is equipped with a load switch operating handle.

Users should provide the following information when ordering products:

◇ Main circuit wiring scheme and special technical requirements
◇ Switchgear installation plan.
◇ Switch cabinet components model specifications and auxiliary loop, control loop schematic diagram (if necessary)
◇ Other special requests for written information.

Project Reference

Cas-space Rocket Launch Project

Test Report

FAQs

1. Are you factory or trading company?

Factory, we can guarantee our price is reasonable and competitive.

2. When can I have the price?

Usually we quote within 24 hours after receiving your inquiry.

3. Can we print our logo and company name on products?

Yes, of course, we accept OEM.

4. What is the lead time?

The lead time depends on the quantities ordered, normally within 15-20 days after receiving the payment.

5. How's your quality control process?

All products will be inspected starting from accessories, and will be carried out with routine tests before leaving our factory.

6. How to solve the quality problems after sales?

Take photos or video of the quality problems and send to us for our checking and confirming, and we will make a satisfied solution for you within 1-3 days.

7. What's the warranty time?

12 months from shipping date.

8. Why choose us

● We are specialized in the field for more than 14 years, and has a well experienced R&D team taking the design and development work for each project based on customer's special demands.
● We have extremely strict QC procedure from components to finished products.
● Steady production period within 15-20 days.
● We have full set of test reports for products.
● One step solution provided.