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500kV-Outdoor H.V.A.C.Live Tank SF6 Gas Circuit Breaker-Hydraulic mechanism

500kV-Outdoor H.V.A.C.Live Tank SF6 Gas Circuit Breaker-Hydraulic mechanism
500kV-Outdoor H.V.A.C.Live Tank SF6 Gas Circuit Breaker-Hydraulic mechanism
500kV-Outdoor H.V.A.C.Live Tank SF6 Gas Circuit Breaker-Hydraulic mechanism
500kV-Outdoor H.V.A.C.Live Tank SF6 Gas Circuit Breaker-Hydraulic mechanism
500kV-Outdoor H.V.A.C.Live Tank SF6 Gas Circuit Breaker-Hydraulic mechanism
500kV-Outdoor H.V.A.C.Live Tank SF6 Gas Circuit Breaker-Hydraulic mechanism
500kV-Outdoor H.V.A.C.Live Tank SF6 Gas Circuit Breaker-Hydraulic mechanism
  • Stock: In Stock
  • Model: LW15A-550/Y
This product is customized according to User Requirement , the above price is for reference, please contact us.



Live tank SF6 gas circuit breakers, whose rated voltage from 40.5kV to 550kV and rated current from 3150A to 5000A are provided with two kinds of operating mechanism, spring and hydraulic type. Motor is used in spring mechanism to charge closing spring and to charge opening spring during closing operation. Disk spring is used in hydraulic mechanism for charging instead of traditional compressed nitrogen gas, and hydraulic driving is used in both opening and closing operations. The two kinds of operating mechanism have their own eatures and are used respectively for different voltage class. Due to the unit structure of circuit breaker, it boasts of advantages of minimized number of breaks and components, simple structure, high reliability as well as long maintenance-free period.

Normal Service Conditions

   Altitude:≤1000m3000m for extremely cold area);

   Average relative humidity monthly:≤90%

   Max. wind velocity:≤35m/s

   Pollution class:Ⅲclass,class

   Ambient temperature -35℃~40℃;(Its satisfied under the condition of -40 in heavy cold area)

   Max.temperature difference daily25K

   Earthquake intensity9 degree

   Max. icing thickness: 20mm;

   Max. radiance from sun1000W/m2

Note: When the product is used out of above condition, the user and the manufacturer shall reach an agreement through coordination.

Main Technical Data

Technical Data of 363~550kV Circuit Breakers

No. Item Uint LW25-363/Y LW25-420/Y LW15A-363/Y LW15A-550/Y
1 Rated voltage kV 363 420 363 550
2 Rated frequently Hz 50 50 50 50
3 Rated current A 4000 4000 5000 31504000
4 Rated short-circuit breaking current kA 50 50 63 5063
5 Rated short-circuit making current kA 125 125 160 125,160
6 Rated short-time withstand current and duration kA 50(4s) 50(4s) 63 503s),633s
7 Rated peak withstand current kA 125 125 160 125,160
8 Creepage distance cm/kV 3.1
9 1min.power frequency withstand voltage Across open breaks kV 580 630+245 510+210 680+318
To earth   510 630 510 740
10 Rated lighting impulse withstand voltage Across open breaks kV 1175+205 1425+345 1175+205 1675+450
To earth   1175 1425 1175 1675
11 Closing time ms 65-95
12 Opening time ms 18~30 ≤20
13 Breaking time ms ≤50 ≤40
14 CO time ms 35~60
15 Rated SF6 gas pressure(at 20℃) MPa 0.60
16 Rated SF6 gas of alarming/lockout pressure(at 20℃) MPa 0.55/0.50
17 Operating mechanism   Hydraulic mechanism
18 Applied standards   GB/T 1984IEC 62271-100DL/T402
Note:“T”following the type of product means that the product is equipped with a Spring mechanism;“Y”with a hydraulic operating mechanism.
LW25D-126/145/T is a kind of 126/145kV single-phase operated circuit breaker.
LW25□-126/T is a special circuit breaker for reactive compensation circuit.
LW25A-252/Y is a kind of 252kV three-phase mechanically gang-operated circuit breaker.

Hydraulic Operating Mechanism for CB

No.  Item  Unit  Technical Data
1 Volage of control circuit V DC 220/DC 110
2 Current of trip coil A 1.43/3.06
3 Current of close coil A 1.43/3.06
4 Voltage of energy-store motor V DC 220/DC 110/AC 220
5 Power of energy-store motor W 470/1300
6 Voltage of heater V AC 220
7 Power of heater W 100
8 Rated mechanical operating pressure Mpa 44.9/53.1

Structure and Principle

For this SF6 circuit breaker, the single-unit structure is applied in the construction. There are advantages of minimized number of breaks and parts, and simply structure.

In hydraulic operating mechanism, the disk spring is charged by oil pump driven by motor. The power of hydraulic pressure is used to complete opening/closing operation. This mechanism is provided with anti-slow opening device.

Main Features and Advantages

5.1 Superior interrupting capability

Single-unit structure is applied in the construction of circuit breaker with variable break distances, which is able to meet different switching requirements. The well designed arc-extinguishing chamber can withstand either severe rising rate of the recovery voltage by a short-line fault or peak recovery voltage by breaking out-of - phase current. In switching excited current, the overvoltage is less than twice of operating voltage. No restrike or reignition occurs during switching line-charging current.

5.2 Reliable insulation and current-carrying capability

Because of the isolation of SF6 gas from the atmosphere, the breaker has a reliable insulating capability.SF6 gas property does not change with age and at the same time it protects the insulating parts within the gas chamber. It also prevents the contacts from oxidization and other chemical reactions as SF6 gas is stable and inert in nature when it is used together with other materials.

5.3 High reliability

The series of circuit breakers passed all type tests at National High Voltage Apparatus Quality Monitor and Inspection Center. The mechanical endurance is 3000 times without adjustment and 10000 times with lubrication and adjustment allowed. They also passed the electrical endurance test, breaking 20 times at rated short-circuit breaking current (40kA/50kA/63kA) during type tests.

5.4 Minimized maintenance work

The circuit breaker is constructed by unit structures, resulting in minimized number of breaks and parts, thus greatly reduces the inspection and maintenance work. In addition, its operating mechanism boasts advanced technology and excellent performance, the circuit breaker hardly needs any repair.

5.5 Excellent earthquake withstand capability

The live tank SF6 gas circuit breaker is substantially resistant to seismic shock due to its simple construction and light weight

Outline and Installation Drawings

Please give clear indication when ordering:

. Type, description of product, and type of mechanism.

. Rated voltage, rated current, short circuit breaking current.

. Pollution class of porcelain: class or class.

. Control voltage of mechanism: DC220V or DC110V.  

Voltage of energy-store motor: AC380V or AC/DC 220V or AC/DC 110V.

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Quality Assurance Period (QAP) Explanation

1.    The Quality Assurance Period (QAP) is an important aspect of our commitment to ensuring the quality and reliability of our products. We understand that customers rely on our goods to function properly and meet their expectations. To demonstrate our confidence in our offerings, we provide a warranty period during which we take responsibility for any quality issues that may arise.
2.    The length of the warranty period varies depending on the type of product. Generally, for consumable components subject to wear and tear, such as abrasion parts, the warranty period is three months. For smaller components, the warranty period is typically extended to six months. As for major equipment and machinery, we offer a one-year warranty period.
3.    We also recognize that each customer's requirements may differ, and we are open to negotiation regarding the warranty period. If the buyer requests a specific warranty duration that differs from our standard policy, we are willing to discuss and accommodate their needs accordingly.
4.    During the warranty period, we take full responsibility for any quality-related issues that arise. If a product is found to be defective or malfunctions due to manufacturing or material faults, we are committed to providing a resolution. This includes either replacing the faulty component or conducting necessary repairs to restore the product to its intended functionality. Our aim is to minimize any inconvenience caused to our customers and ensure their satisfaction.
5.    It is important to note that the warranty does not cover damages resulting from improper use, mishandling, or normal wear and tear. Additionally, if any modifications or repairs are carried out by unauthorized personnel during the warranty period, the warranty may become void.
6.    At our company, customer satisfaction is our top priority. We strive to provide high-quality products that meet and exceed expectations. The Quality Assurance Period serves as a testament to our commitment to delivering reliable solutions and ensuring that our customers have peace of mind when choosing our products.


1.    We offer various trade methods, including EXW, FOB, CIF, DDU, DDP, etc., allowing customers to choose the most suitable option based on their requirements.
2.    We consider the proximity to the factory where the goods are located when selecting the appropriate port of departure.
Customers can provide the destination port where the consignee is located or choose a designated port for delivery.
3.    Our transportation methods encompass a wide range of options, including waterway transportation, air transportation, and courier services such as DHL, FedEx, EMS, UPS, TNT, etc.
For waterway transportation, we work with reputable shipping companies such as APL, CMA, CNC, COSCO, EMC, EVERGREEN, HMM, KMTC, MCC, MSC, MSK, ONE, SITC, YML, etc.
Air transportation is available through airlines such as (Air China): CA; (China Southern Airlines): CZ; (China Eastern Airlines): MU; (Garuda Indonesia): GA; (Cathay Pacific Airways): CX; (Cathay Dragon): KA; (Korean Air): (Japan Airlines): JL;  (Singapore Airlines): SQ; (Thai Airways International): TG, and more.
4.    The transportation time will vary depending on the destination and the chosen transportation method. We will communicate and confirm the estimated time of arrival with the customer prior to shipping.
5.    Shipping costs are influenced by factors such as transportation method, weight, size, and destination. We provide shipping cost estimation services to assist customers in budgeting.
6.    Once the goods are shipped, we offer order tracking services to provide customers with detailed information about the whereabouts of their shipment. Additionally, based on the selected trade method, we can arrange cargo insurance to provide compensation in the event of loss or damage during transportation.
7.    The specific transportation arrangements mentioned above will be coordinated by dedicated personnel, taking into account the actual situation and policies. We strive to tailor the optimal and most cost-effective shipping plan based on the information provided by the customer.

Please note that we are committed to ensuring the smooth transportation of goods and will work closely with customers to address any specific requirements or concerns they may have regarding transportation.