RHB Live tank SF6 gas circuit breaker

RHB Live tank SF6 gas circuit breaker

The Live tank SF6 gas circuit breaker (equipped with CT - type spring operating mechanism) is an outdoor three - phase AC 50HZ high - voltage power transmission equipment. It is used to interrupt and close the rated current, interrupt the fault current, or switch the circuit, so as to achieve the control and protection of the power transmission line.

This circuit breaker can not only perform single - pole opening, closing, and fast auto - reclosing operations, but also, through the electrical interlocking among the three poles, conduct three - pole opening, closing, and fast auto - reclosing operations. The circuit breaker adopts the Live tank SF6 gas circuit breaker principle and has the characteristics of simple structure, low required operating power, high reliability, easy installation, and low noise.

Service environment

Ambient temperature:  -25℃～+40℃

Altitude :<1000m

Wind speed: <34m/s

Daily temperature difference: <25°C

Solar irradiance: < 0.1w/cm²

Monthly average relative humidity: <90%

Ice - coating thickness: <10mm

Seismic acceleration resistance: Horizontal <0.2g, vertical <0.1g

Installation location: Outdoor

Adopt pointer-type density relays for pressure and density monitoring：

The circuit breaker adopts a three-phase porcelain insulator post-type structure, designed for outdoor applications. All three phases share a single spring operating mechanism, centrally arranged with triple-pole linked operation, resulting in a sleek and refined appearance.

SF6 gas is used for arc extinguishing：

The circuit breaker uses SF6 gas as the insulating and arc - quenching medium. During operation, the SF6 gas in the three poles of the circuit breaker should be connected to ensure stable performance and safety.

Monitor with a pointer-type density relay：

To accurately monitor the operating status, a pointer-type density relay is employed to conduct real-time monitoring of its pressure and density, enabling timely detection of anomalies and ensuring the safe and stable operation of the equipment.

Adopt the arc extinguishing principle：

It effectively improves the mechanical efficiency and minimizes the operating work.

In the name of professionalism, we create exclusive customization plans for you. With our exquisite craftsmanship and rich experience, we meet every detailed requirement of yours. If you need detailed customization, feel free to contact our sales representatives at any time.

When the circuit breaker receives a tripping command, the rigid moving components composed of the air cylinder, movable arc contact, tie rod, etc. move downward under the action of the tripping spring. During the movement, the static main contact finger first separates from the movable main contact (i.e., the air cylinder), and the current is transferred to the two still - closed arc contacts. Subsequently, the arc contacts separate and an arc is formed.

When interrupting a short - circuit current, due to the relatively large breaking current, the arc energy between the arc contacts is high. The hot gas flow in the arc region flows into the thermal expansion chamber, where heat exchange occurs to form a low - temperature and high - pressure gas. At this time, since the pressure in the thermal expansion chamber is greater than that in the gas - compression chamber, the check valve closes. When the current passes through zero, the high - pressure gas in the thermal expansion chamber blows between the breaking contacts to extinguish the arc. During the tripping process, the air pressure in the gas - compression chamber is initially compressed. However, when a certain air pressure value is reached, the elastic pressure - relief valve at the bottom opens. Air is both compressed and released simultaneously, so that the mechanism does not need to overcome more gas - compression reaction force, thus greatly reducing the operating work (see Figure B).

When interrupting a small current (usually below several thousand amperes), due to the low arc energy, the pressure generated in the thermal expansion chamber is low. At this time, the pressure in the gas - compression chamber is higher than that in the thermal expansion chamber, and the check valve opens. The compressed gas blows towards the breaking contacts. When the current passes through zero, these gases with a certain pressure blow towards the breaking contacts to extinguish the arc (see Figure C).

Structure diagram of the arc - quenching chamber

The base

The base serves to support the three - pole columns and connect to the control cabinet. It is made by bending steel plates. After covering the corresponding cover plates, it can meet the IP2X protection level . The pressure gauge and nameplate can be observed on the front of the base, and there are three installation hand - holes on the back. Inside the base, there are three - phase SF6 gas filling pipelines and a pointer - type density relay. When the gas - filling valve of the pole column is not connected, the gas in the filling pipeline is in a sealed state, and the value shown on the pressure gauge is the pressure inside the pipeline. There is a three - way joint below the pressure gauge, and the empty joint is the gas - filling joint of the circuit breaker.

The pointer - type SF6 density relay (i.e., the pressure gauge) is used to monitor the density of the SF6 gas in the equipment and send out control signals. It has a temperature compensation function. When the pressure of the SF6 gas changes due to the variation of the ambient temperature, the controller will not act. Only when the pressure of the SF6 gas changes due to gas leakage will the controller send out alarm and blocking signals.

The control cabinet is connected to the base by six M16 bolts. There are moisture - proof and dust - proof sealing devices at the connection between the mechanism output shaft and the B - phase crank arm and at the outlet of the secondary wiring.

Notes:

1.When the pole column is not connected, the value shown on the pressure gauge is the pressure inside the gas filling pipeline.

2.The value shown on the pressure gauge is the pressure value at 20°C. Pole Column Each pole column is an airtight unit. From top to bottom, the pole column is composed of the upper outgoing line plate, arc quenching chamber, lower outgoing line plate, supporting porcelain bushing, insulating tie rod, direct - acting seal, and mechanism operation shaft.

Supporting Porcelain Bushing

The supporting porcelain bushing serves the functions of supporting the arc quenching chamber and insulating it from the ground. An insulating tie rod is installed inside the porcelain bushing, which plays the roles of insulating from the ground and providing mechanical transmission.

Upper and Lower Outgoing Line Plates

The upper and lower outgoing line plates are used for the primary wiring of the circuit. The outgoing direction of the upper outgoing line plate can be installed according to the user's requirements. If there is no requirement from the user, the upper outgoing line plate is installed on the front side. The sizes of the wiring holes of the upper and lower outgoing line plates are designed according to two wiring methods of 3150A and 1250A.

Arc quenching chamber

The arc - quenching chamber, which is integrally installed inside the porcelain bushing of the arc - quenching chamber, is the core component of the circuit breaker. It is mainly composed of components such as the porcelain bushing, static contact support, static main contact, static arc contact, nozzle, air cylinder, movable arc contact, intermediate contact, lower support base, and tie rod.

The long - term current - carrying circuit consists of the upper terminal board, static contact base, static main contact, air cylinder, intermediate contact, lower support base, and lower terminal board. During the process of interrupting the current, the arc current flows through the static arc contact mounted on the static contact base and the movable arc contact mounted on the air cylinder, playing a role in guiding the arc during the interruption.

A check valve is installed at the lower part of the thermal expansion chamber of the air cylinder, and a gas return valve and a pressure - relief device are installed at the lower part of the gas - compression chamber.

CT20 Spring Operating Mechanism

The circuit breaker is equipped with a CT-type spring operating mechanism. The structural diagram is shown in Figure 3, and the operating principle is described as follows:

a. Closing Spring Energy Storage

The closing spring (1) is in a pre - compressed state. The energy - storage crank arm is connected to the motor through the bevel gear pawl shaft.During energy storage, the motor drives the bevel gear to rotate through the pawl shaft. The bevel gear pushes the energy - storage crank arm to rotate counter - clockwise through the shaft pin.

Through the transmission of the energy - storage shaft key - connected to the energy - storage crank arm, the spring crank arm pulls the closing spring (1) to compress and store energy through the pin and tie rod connected to it. When the pin passes over the left vertex position, the closing spring drives the energy - storage crank arm to rotate counter - clockwise by about 5°.

The energy - storage retaining pin (4) on the energy - storage crank arm is latched by the closing retaining pawl (9), completing the energy - storage action. At this time, the motor power is cut off, and the pawl is disengaged from the ratchet.

b. Closing Operation

The circuit breaker is in the open position, and the closing spring has stored energy.When the mechanism receives a closing command, the closing coil is energized. The moving iron core of the closing electromagnet (14) is attracted, driving the closing guide rod to strike the closing pawl (13) to rotate clockwise, releasing the energy - storage retaining pawl (15).

The closing spring drives the ratchet to rotate counter - clockwise rapidly. The cam (18) coaxial with the ratchet strikes the closing roller on the output crank arm (7), making the crank arm move upward. Through the connecting rod, the circuit breaker body is driven to perform the closing operation. At this time, the closing retaining pin (20) on the output crank arm is latched by the closing retaining pawl (9) to maintain the closing state.

At the same time, the opening spring crank arm coaxial with the output crank arm compresses the opening spring (16) to store energy, preparing for the opening operation.The closing operation can also be realized by manually striking the closing electromagnet guide rod.

After the closing operation is completed, the travel switch is automatically turned on,  and the motor stores energy for the closing spring again.

c. Opening Operation

The circuit breaker is in the closed position, and both the closing spring and the opening spring have stored energy.When the mechanism receives an opening command, the opening coil is energized. The moving iron core of the opening electromagnet is attracted, driving the opening guide rod to strike the opening pawl (10) to rotate clockwise, releasing the closing retaining pawl (9). The opening spring releases energy and drives the circuit breaker body to perform the opening operation through the crank arm and connecting rod.The opening operation can also be realized by manually striking the opening electromagnet guide rod.

d. Anti - tripping Device

This mechanism is equipped with a mechanical anti - tripping device and can also achieve electrical anti - tripping.

Rotation principle

The output crank arm converts the circular motion of the opening and closing operations output by the mechanism into horizontal motion through the connecting rod, transmission shaft, connecting plate and horizontal tie rod, so as to realize the opening and closing operations of the circuit breaker body. There are opening and closing buffers (limiters) to absorb the residual energy after the moving contact finishes its movement and limit the terminal position of the moving contact.

OEM/ODM Services:

At Shaanxi Yuguang Electric Co., Ltd., we understand the importance of customization. That's why we offer comprehensive OEM and ODM services to meet your specific requirements. Whether you need private labeling or custom product development, our experienced team is here to assist you every step of the way.

Certificates:

We take pride in our commitment to quality and safety. Our products are certified to meet the highest industry standards, including:

3C Certification

ISO 9001 Certification

21 Utility Model Patents and Design Patents

Why Choose Us:

State-of-the-art Manufacturing Equipment

Extensive Testing Facilities

Comprehensive Quality Assurance Processes

ISO 9001 Certified Quality Management System

One-year Warranty on All Products

Large Production Capacity

FAQ:

Q: What is the warranty period for your products? A: We offer a one-year warranty on all our products.

Q: Can you customize products according to our specifications? A: Yes, we provide OEM and ODM services to meet your specific requirements.

Q: Are your products compliant with international standards? A: Yes, our products meet all relevant international standards.

Q: What is the lead time for orders? A: The lead time depends on the quantity and customization requirements. Please contact us for more information.

Q: Do you provide technical support? A: Yes, we offer comprehensive technical support to our customers.

Packaging:

Wooden Box Packaging

Carton Packaging

Foam-filled Packaging

Waterproof and Moisture-proof Packaging

Customized Packaging

International Standard Packaging

Logistics:

Sea Freight

Air Freight

Land Transportation

Multimodal Transport

Express Delivery Services

Contact Us:

Ready to take your electrical projects to the next level? Contact us today at ygvcb@hotmail.com to discuss your requirements and explore partnership opportunities with Shaanxi Yuguang Electric Co., Ltd. Let's create a brighter future together.