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Gas-insulated switchgear components

Gas-insulated switchgear components

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Description

 

SF6 ring main unit with SF6 load switch as main switch, for whole cabinet is suitable for electric distribution automation and compact expandable metal close switchgear. It characters in its simple structure, flexible operation, reliable interlocking and convenient installation etc., which can provide the satisfactory technical projects for both different application occasions and users. With the adoption of sensor technology and the protection relay up to date, plus the advanced technology and flexible assembly project.

Load break switch

The load break switch is a 3-position switch disconnector and earthing switch using SF6 gas as an arc-quenching medium, the switch positioning is close open earthed. In the open position, the switch satisfies the disconnector requirements.

3-position load break switch (closed, open, and earthed) Spring mechanism consists of single spring action, double spring operating mechanism. Among them, the double spring operating mechanism used in switchgear unit, can realize the automatic tripping trip.
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Parameters

 

Vacuum Сircuit breaker

RMU Vacuum circuit breaker has vacuum bottles as interrupters of the current. In series with the circuit breaker main circuit is connected a 3-position disconnector/earthing switch. The operation between vacuum circuit breaker and is connector/earthing switch is mechanically interlocked.

Compact, simple structures and safe operation.

 

Fuse

By means of tripping device, it operates as a switch-fuse combination. Two earthing switches are equipped in both sides of the fuse-links in order to ensure the personal safety of operators.

Both earthing switches are operated in one operation.

The switch-fuse and earthing switch is mechanically interlocked to prevent unauthorized access to the fuse-links.

The lower cover, which gives access to the fuse-link, is also mechanically interlocked with the earthing switch.

The fuse holder is sealed tightly, so it is anti-electric dust and moisture.

Note: Fuse selection for transformer protection selection refer to IEC fuse standard.

Gas pressure / density meter

Density meter with Low voltage pressure alarm General density meter

Each tank of RMU is equipped with density meter to monitor the gas pressure inside. The pointer of the meter is in the green area that means the normal pressure in the gas tank, if the pointer is in the red zone; it means the pressure of the tank is low. It is required to periodically inspect the density meter, to ensure the pressure in the normal range. Additionally, density meters with low-pressure alarm is also available as an option. The meter is provided as the customer specified.

Type C Bushing

Type C Bushing The connection of the HV-cables is made by cable Type C bushings. See right side pictute. The Type C bushings are made of cast resin epoxy with moulded-in conductors. This C type is used together with full-screened elbow cable connectors which is an ideal solution for areas with humidity or condensation problems is achieved
Voltage indicator Each unit is equipped with voltage indicator with phase check outlet, which has feature like stable performance, high brightness, wide viewing angle, long life.
Fault indicator Fault indicator is provided as an option Fault indicator for detection of a short circuit, single-phase earth fault. Accurate detection and clear indication.

Above components of RMU is standard equipped, any special requirement please consult our engineering team.

CT / Zero sequence CT

CT/Zero sequence CT are provided according to the customer’s requirement. They are installed on external bushings when it is needed. CT should be earthed reliable, and open circuit of secondary side is not allowed, or it will lead to severe damage to the equipment and even dangers to the individuals.

 

Elbow cable connector and relevant accessories

-Frontal elbow cable connectors
-Copper conductors
-Press cores
-Copper lugs
-Additional back cable connector optional-Additional elbow connector type surge arrester

 

Operating Handle

The operating handle has two sides, for both Load break switch, circuit breaker, and earthing switch manual operation,

 

Protection relay

RP260 protection device is numerical protection relay
with self-powered.
-OC/EF protection
-Fault report
-UV/OV protection
-Frequency protection
-Other required is discussable
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Solutions

 

METTZ Group stands as a consortium of Chinese electrical firms, renowned for its expertise in manufacturing electrical equipment. We are specialized in crafting a comprehensive suite of transmission and distribution equipment, covering a wide voltage range from 0.4 to 40.5 kV. Our commitment lies in delivering reliable and stable products to our clientele, encompassing vacuum circuit breakers (VCB), gas-insulated switchgear modular units (RMU), solid insulated switchgear (SIS) panels, air insulated switchgear (AIS) panels, and dry compressed air insulated switchgear panels (DIS).

Since our inception, METTZ Group has been at the forefront of adopting international cutting-edge technologies and equipment. We pride ourselves on our extensive collaboration and dialogue with leading experts in the electrical technology sector, both within China and internationally. Our offerings are tailored to meet the specific needs of our clients, including Original Equipment Manufacturer (OEM) services, customization of products to unique parameters and dimensions, all in alignment with our customers’ specifications.

METTZ Group is dedicated to innovation, quality, and customer satisfaction, ensuring that we remain a preferred partner for electrical equipment solutions worldwide.

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