Basic Info.
Breaking Capacity
High Voltage Circuit Breakers
Operation
Electric and Manual
Speed
High-Speed Circuit Breaker
Arc-extinguishing Medium
Vacuum
Installation
Pole Mounted
Function
Conventional Circuit Breaker, Circuit-Breaker Failure Protection, Overcurrent Protection, OVP(Overvoltage Protection)
Certification
ISO9001-2000, CE, CCC
Trademark
OEM or our own brand
Transport Package
Export Plywood Box
Product Description
ZW20A-12F/T
Outdoor High-voltage AC Boundary Circuit Breaker - Overview
ZW20A-12F/T Outdoor High-voltage AC Vacuum Boundary Circuit Breaker (hereinafter referred to as "boundary circuit breaker") is a new intelligent product developed based on ZW20A-12 circuit breaker, it is mainly provided with vacuum circuit breaker body, MGK-15T controller and external voltage transformer, widely used as breaking isolation switch and interconnection switch in 10kV urban and rural distribution network overhead ring network line for breaking isolating switch and interconnection switch, realizes load deployment of ring network line, used as the boundary switch (also called "watchdog") in the power supply branch line of big user and has the protection control and communication functions. It can judge and detect the milliampere zero-sequence current and inter-phase short-circuit fault current in the industry, and cut off single-phase grounding fault and inter-phase short-circuit fault automatically.
The switch body uses vacuum arc extinguishing and SF6 gas insulation. The box has good sealing performance and can be filled with SF6 gas without leakage and external environmental influence. The performance of spring operating mechanism is optimized, and the action reliability is superior to traditional spring mechanism. - Functions of boundary circuit breaker
| Automatic cutting of single-phase grounding fault | When the branch line of user has single-phase grounding fault, the boundary circuit breaker will be opened automatically, so that other branch users on the substation and feeder are not affected by the fault |
| Automatic isolation of inter-phase short-circuit fault | When the branch line of user has inter-phase short-circuit fault, the boundary circuit breaker will be opened automatically and the fault line will be isolated automatically, so that the users of other branches on the feeder are not affected |
| Quick positioning of fault points | After the protection of boundary circuit breaker acts due to branch line fault of user, only the responsible user suffers outage and reports the fault information actively, and the power company can send personnel to the site rapidly for troubleshooting; If the boundary circuit breaker has communication module, information will be reported to the Power Management Center automatically |
| User load monitoring | The boundary circuit breaker can be provided with wired/wireless communication accessories, transmits monitoring data to the Power Management Center and realizes remote real-time data monitoring for the users. |
- Product model
| | Rated short-circuit breaking current (KA) |
| Rated current (A) |
| Permanent magnetic actuator |
| Boundary circuit breaker |
| Rated voltage (KV) |
| Design No. |
| Outdoor vacuum circuit breaker |
| Design No. |
| Intelligent controller |
2. Ambient temperature: outdoors: -30ºC - +55ºC
Highest annual average temperature: 20ºC
Highest daily average temperature: 30ºC
Maximum daily temperature difference: 25ºC
3) Relative humidity: 95% (25ºC)
4) Anti-seismic capacity: Ground horizontal acceleration: 0.3g
Ground vertical acceleration: 0.15g
Act on three sine waves simultaneously and continuously
Safety factor: 1.67
5) Seismic intensity: 7°
6) Sunlight intensity: (when wind speed is 0.5m/s): 0.1W/cm2
7) Maximum wind speed: 34m/s
8) Maximum icing thickness: 10mm
9) Installation position: user responsible boundary points of outdoor 10kV overhead line
10) Grounding mode: neutral non-grounding, grounding through arc-extinguishing coil and low-resistance grounding - Product structure and working principle
The boundary circuit breaker is optimized and improved based on ZW20A-12 vacuum circuit breaker (see operation instruction of ZW20A-12 outdoor high-voltage AC vacuum circuit breaker), composed of external voltage transformer and MGK-15T intelligent controller and realizes electrical connection through full-sealing waterproof aviation connector and outdoor sealing cable.
The boundary circuit breaker is provided with CTA-IV spring operating mechanism and has the functions of manual/electrical energy storage, opening and closing.
There is a zero-sequence CT (transformation ratio: 20/1; 0.1-5A (primary current) section keeps the linear relation; rated load: 1Ω) in boundary circuit breaker, the transformation ratio error under rated load shall be less than 3%, the primary zero-sequence current is 400A, and the effective value of secondary output current is no less than 5A. Rated short-time withstand current 16kA, 20kA, 25kA, 4s.
There are two single-phase CTs (transformation ratio: 600/5; rated load: 10Ω; precision: 10P20; rated short-time withstand current: 16kA, 20kA, 25kA, 4s) in boundary circuit breaker.
The boundary circuit breaker has an external PT (transformation ratio: 10000/220V; capacity: 300VA; precision: Level 3P) installed on the power supply side, and the operational power supply and voltage signal of controller and circuit breaker are supplied by PT.
IV. Main technical parameters 4.1 Main Technical Parameters Table (Table-1) | S/N | Item | Unit | Value |
| 01 | Rated voltage | kV | 12 |
| 02 | Rated frequency | Hz | 50 |
| 03 | Rated current | A | 630,1000 |
| 04 | Rated short-circuit breaking current | KA | 12.5,16,20,25 |
| 05 | Rated peak withstand current (peak) | kA | 31.5,40,50,63 |
| 06 | Rated short-time withstand current (4s) | kA | 12.5,16,20,25 |
| 07 | Rated short-circuit making current (peak) | kA | 31.5,40,50,63 |
| 08 | Mechanical life | Time(s) | 10000 |
| 09 | Breaking times of rated current | Time(s) | 10000 |
| 10 | Breaking times of rated short-circuit breaking current | Time(s) | 30 |
| 11 | Power frequency withstand voltage (1min): Inter-phase, over the ground/fracture | kV | 42/49 |
| 12 | Lightning impulse withstand voltage (peak) inter-phase, over the ground/fracture | kV | 75/85 |
| 13 | Secondary circuit power frequency withstand voltage for 1min | kV | 2 |
| 14 | Net weight | kg | 140 |
| S/N | Item | Unit | Value |
| 01 | Clearance between open contacts | mm | 9+1 -0.5 |
| 02 | Contact over stroke | mm | 3+1 -0.5 |
| 03 | Opening speed | m/s | 1.2±0.2 |
| 04 | Closing speed | m/s | 0.6±0.2 |
| 05 | Closing and bounce time of contact | ms | ≤2 |
| 06 | Inter-phase center distance | mm | 135±1.5 |
| 07 | External electrified air insulation distance | mm | 240±2 |
| 08 | Specific creepage distance | cm/kV | 3.8 |
| 09 | Three-phase and non-synchronism of opening | ms | ≤2 |
| 10 | Conducting circuit resistance of each loop | uΩ | ≤150 |
| 11 | Closing time | ms | ≤45 |
| 12 | Opening time | ms | ≤45 |
| 13 | Rated power of energy storage motor | W | ≯40 |
| 14 | Rated voltage of energy storage motor | V | AC220 |
| 15 | Rated voltage of closing operation | V | AC220 |
| 16 | Maximum/minimum voltage of closing operation | V | AC264/143 |
| 17 | Rated voltage of opening operation | V | AC220 |
| 18 | Maximum/minimum voltage of opening operation | V | AC264/143 |
| 19 | Maximum/minimum motor voltage | V | AC242/187 |
| 20 | SF6 rated gas pressure (gauge pressure) | MPa | "0" |
Address:
No. 281-288, Wei 15th Road, Economic Development Zone, Yueqing, Wenzhou, Zhejiang, China
Business Type:
Manufacturer/Factory
Business Range:
Electrical & Electronics
Management System Certification:
ISO 9001, ISO 14001
Company Introduction:
Shanghai Yingming Power Technology Co., Ltd. Was established in Shanghai in 2009, and we has developed one of professional Power Transmission & Distribution Suppliers in China, also being as one of the recommended model companies for National Power Grid Construction & Reformation.
For the production convenience and cost reduction, we now move to Yueqing Economic Development Zone, Wenzhou city, Zhejiang Province. We′re now special in manufacturing and exporting Vacuum Circuit Breakers, Voltage Transformers & Current Transformer (PT & CT), Disconnecting Switches, SF6 Load Break Switch (LBS), Transformer, Fuse Cutouts, Surge Arresters, and Insulating components.
We have strong ability to develop new products and assembly line optimization, to meet the customers′ diverse needs against our reinforced enterprise strength, refined technical & management team. Over 10 years′ production and sales experience, we′re well received in American countries, Russian, Southeast Asian and African market by the excellent quality and the best after-sales service.
We′re also a OEM & ODM manufacturer, accept small trial orders to know the better about our product quality, packaging and shipment. Welcome to inquiry us which all will be replied within 24 hours. We also cordially welcome all customers to visit us and discuss business cooperation or being as our agent in your country.
