Overview
Suitable for use in outdoor three-phase AC distribution systems with a rated voltage of 12kV and a rated frequency of 50Hz, for breaking and making load current and making current.
Suitable for substations, industrial and mining enterprises, and urban and rural networks for protection and control, as well as for urban and rural network automated distribution networks and locations with frequent operations.
Used as an operating control switch for overhead line distribution systems, available in multiple types. The FZW28-12 pole-mounted vacuum load break switch features outstanding advantages such as being oil-free, having a simple mechanism, reliable performance, and requiring no maintenance, and has been widely used to date. When combined with equipment such as FDR-type fault detectors or RTU remote terminal units, this product forms a distribution automation system with a very simple structure, capable of automatic fault location and automatic isolation of fault sections on overhead lines. It is designed to meet the need for upgrading existing distribution switchgear in China, enabling distribution equipment renovation characterized by being oil-free and automated.
Main Technical Parameters
| Item | Unit | 12kV |
| Working Power Supply | V | 50Hz, AC220V |
| Allowable panel deviation 20% Ripple: ≤2% | ||
| Power Consumption | W | 6W |
| Voltage Transformer | V, VA | 250V, 0.1VA |
| Current Transformer | A, VA | 1A, 0.1VA |
| Zero-Sequence Current Transformer | A, VA | 1A, 0.1VA |
| Output Contact Capacity | A, V | 2A/230V DC |
| Load Control | s | 60s (adjustable) |
| i.Lock Locking Time | ms | < 600A: 160ms; > 600A: 700ms |
| Zero-Sequence Current Setting | A | 0.4A-2.0A |
| Zero-Sequence Current Time Setting | S | 0.6s-15s |
| Insulation Resistance | MΩ | ≥2500 |
| Insulation Voltage | V | Power supply, power supply, closing: AC, 2000V |
| Rated Voltage, Frequency | kV, Hz | 12, 50 |
| Rated Current | A | 630 |
| Rated Short-Time Withstand Current | kV | 20kA/16kA, 4S |
| Rated Making Current | kV | 50 |
| Power Frequency Withstand Voltage to Ground/Phase-to-Phase/Across Open Contacts | kV | 42/42/48 |
| Lightning Impulse Withstand Voltage to Ground/Phase-to-Phase/Across Open Contacts | kV | 75/75/85 |
| Mechanical Life, Electrical Life at Rated Current | Operations | 10000, 5000 |
| Weight | kg | 198/195 |
| SF6 Gas Pressure/Annual Leakage Rate | 0 gauge pressure/≤1% | |
| CT Ratio | 630:1 | |
| Zero-Sequence Current CT Ratio | 20:1 | |
| Zero-Sequence Voltage Phase Discriminator ZPD | mA, DEC | 2, -180° ---+180° |
| Power Supply Transformer SPS | kv/v, VA | 10/230, 100 |
