69kV 72.5kV 84kV 88kV Three-phase AC Dead tank type SF6 circuit breaker source manufacturer
Key attributes
| Brand | ROCKWILL |
| Model NO. | 69kV 72.5kV 84kV 88kV Three-phase AC Dead tank type SF6 circuit breaker source manufacturer |
| Rated voltage | 72.5kV |
| Rated normal current | 4000A |
| Rated frequency | 50/60Hz |
| Rated short circuit breaking current | 40kA |
| Series | RHD |
Product descriptions from the supplier
Description
69kV 72.5kV 84kV 88kV Three-phase AC Dead tank type SF6 circuit breaker is suitable for the rated voltage of 66kV, the rated frequency of 50Hz of the high-voltage transmission and transformation system, through the distribution and combined load current, interrupt the fault current, to achieve the control, measurement and protection of the transmission line, the product structure is compact, the area is small, especially suitable for earthquake-prone areas, polluted areas and areas with relatively small space size. The circuit breaker has excellent breaking performance, and the rated short-circuit breaking current can reach 63kA; The product is easy to install and maintain.
Main Features
System Architecture
The gas-insulated metal composite combined electrical appliance (HGIS) is composed of several standard functional modules, such as circuit breaker GCB (single and double busbars), isolation-grounding switch TPS, voltage transformer PT, current transformer CT, etc. These modules have the same interface form and size. Various modules can be combined to meet the design and layout requirements of various substations.
Single-busbar single-isolation scheme
Single-busbar double -isolation scheme
Main characteristics：
electrical
Voltage Ratings: 3.6kV, 4.76kV, 7.2kV, 8.25kV, 11kV, 12kV, 13.2kV, 13.8kV, 15kV, 15.5kV, 17.5kV, 22kV, 22.9kV, 24kV, 25.8kV, 27kV, 33kV, 36kV, 38kV, 40.5kV, 44kV, 60kV, 63kV, 66kV, 69kV, 88kV, 115kV, 123kV, 125kV, 126kV, 132kV, 138kV, 145kV, 150kV, 170kV, 184kV, 204kV, 220kV, 225kV, 230kV, 245kV, 275kV, 330kV, 345kV, 400kV, 765kV, 800kV with a rated short-circuit breaking current of 50kA or 63kA, and we offer customization services.
| Item | Unit | Parameters | |||
| Rated maximum voltage | kV | 72.5 | |||
| Rated maximum current | A | 1600/2500/3150/4000 | |||
| Rated frequency | Hz | 50/60 | |||
| 1min Power frequency withstand voltage | kV | 185 | |||
| Lightning impulse withstand voltage | kV | 450 | |||
| First open pole factor | 1.5/1.5/1.3 | ||||
| Rated short circuit breaking current | kA | 25/31.5/40/50/63 | |||
| Rated short - circuit duration | s | 4/3 | |||
| Rated out - of - phase breaking current | 10 | ||||
| Rated cable charging current | 10/50/125 | ||||
| Rated peak value withstand current | kA | 80/100/125 | |||
| Rated making current (peak) | kA | 80/100/125 | |||
| Creepage distance | mm/kV | 25 - 31 | |||
| SF6 gas leakage rate (per year) | ≤1% | ||||
| Rated SF6 gas pressure(20℃ gauge pressure) | Mpa | 0.5 | |||
| Alarm/blocking pressure(20℃ gauge pressure) | Mpa | 0.45 | |||
| SF6 annual gas leakage rate | ≤0.5 | ||||
| Gas moisture content | Ppm(v) | ≤150 | |||
| Heater voltage | AC220/DC220 | ||||
| Voltage of control circuit | DC | DC110/DC220/DC230 | |||
| Voltage of energy - store motor | V | DC 220/DC 110/AC 220/DC230 | |||
| Applied standards | GB/T 1984/IEC 62271 - 100 | ||||
mechanical
| Name | unit | Parameters | |||
| Opening time | ms | 27±3 | |||
| Closing time | ms | 90±9 | |||
| Minute and conjunction time | ms | 300 | |||
| Together--ivide the time | ms | ≤60 | |||
| Simultaneity of opening | ms | ≤3 | |||
| Closing simultaneity | ms | ≤5 | |||
| Moving contact stroke | mm | 150+2-4 | |||
| Contact contact stroke | mm | 27±4 | |||
| Opening speed | m/s | 4.5±0.5 | |||
| Closing speed | m/s | 2.5±0.4 | |||
| Mechanical life | times | 6000 | |||
| Operation sequence | O - 0.3s - CO - 180s - CO | ||||
| Note: The opening and closing speed and time are the characteristic values of the circuitbreaker when it is single divided and closed under rated conditions. The closing speed is theaverage speed of the moving contact from the rigid closing point to 10 ms before closing, andthe opening speed is the average speed of the moving contact within 10 ms from the justequinox to 10 ms after the separation. | |||||
Product use environment
Place of use: outdoor.
Ambient air temperature: -40℃~ +40℃
Altitude: no more than 1000m.
Air pollution level: Class IV.
Wind pressure: not more than 700Pa (equivalent to wind speed 34 m/s).
Earthquake level: no more than 9 degrees.
Relative humidity: the average daily relative humidity is not more than 95%; The average monthly relative humidity is not more than 90%.
Note: When the use conditions of the circuit breaker exceed the above provisions, it shall be determined by the user and the manufacturer through negotiation.
1. Select the circuit breaker corresponding to the voltage level based on the power grid level
The standard voltage (12/24/40.5/72.5/126/170/245/363/420/550/800/1100kV) is matched with the corresponding nominal voltage of the power grid. For example, for a 35kV power grid, a 40.5kV circuit breaker is selected. According to standards such as GB/T 1984/IEC 62271-100, the rated voltage is ensured to be ≥ the maximum operating voltage of the power grid.
2. Applicable scenarios for non-standard customized voltage
Non standard customized voltage (11/22/44/52/132/230/275/300/345/400/380/765kV) is used for special power grids, such as the renovation of old power grids and specific industrial power scenarios. Due to the lack of suitable standard voltage, manufacturers need to customize according to power grid parameters, and after customization, insulation and arc extinguishing performance must be verified.
3. The consequences of selecting the wrong voltage level
Choosing a low voltage level can cause insulation breakdown, leading to SF leakage and equipment damage; Choosing a high voltage level significantly increases costs, increases operational difficulties, and may also result in performance mismatch issues.
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