Overview
The FZN25-12 and FZ(R)N25-12D indoor AC high-voltage vacuum load switches, together with the FZRN25-12D/T200-31.5 indoor AC high-voltage vacuum load switch-fuse combination apparatus, are control and protection devices for three-phase AC 50 Hz, 12 kV distribution systems. The products are oil-free, non-toxic and free from fire and explosion hazards, and are widely used in industrial and mining enterprises as well as urban building distribution stations. The combination apparatus provides more reliable protection for transformers and other electrical equipment than a circuit breaker, and is especially suitable for ring main units, double radial supply units and prefabricated substations. The FZN25-12D/T630-20 indoor AC high-voltage vacuum load switch (hereinafter referred to as the switch) is a three-phase AC 50 Hz indoor device with a rated voltage of 12 kV, suitable for use in distribution substations of industrial and mining enterprises and substations, serving as protection and control for electrical installations, for switching load current, closed-loop current, no-load transformers and cable charging current. It is equipped with an earthing switch capable of making short-circuit current. Its operating mechanism can be manual or electric, facilitating the three-remote (telemetry, remote signalling, remote control) requirements of the power system. The FZRN25-12D/T200-31.5 indoor AC high-voltage vacuum load switch-fuse combination apparatus (hereinafter referred to as the combination apparatus) is a three-phase AC 50 Hz indoor device with a rated voltage of 12 kV, suitable for distribution substations of industrial and mining enterprises and substations, used for load control and short-circuit protection. It is also equipped with an earthing switch capable of making short-circuit current. Its operating mechanism can be manual or electric, facilitating the three-remote requirements of the power system.
Type Designation
Outline and Mounting Dimensions
Technical Parameters (see table)
| No. | Item | Unit | FZN25-12D/T630-20 | FZRN25-12D/T200-31.5 |
|---|---|---|---|---|
| FZN25-12D/T630-20 | FZRN25-12D/T200-31.5 | |||
| 1 | Rated voltage | kV | 12 | 12 |
| 2 | Rated current | A | 630 | 200 |
| 3 | Rated frequency | Hz | 50 | 50 |
| 4 | Rated insulation level - 1 min power-frequency withstand voltage | kV | 30 across arc-extinguishing chamber; 42 to ground/phase-to-phase; 48 across isolating gap | 30 across arc-extinguishing chamber; 42 to ground/phase-to-phase; 48 across isolating gap |
| Lightning impulse withstand voltage (peak) | kV | 75 to ground/phase-to-phase; 85 across isolating gap | 75 to ground/phase-to-phase; 85 across isolating gap | |
| 5 | Rated short-time withstand current | kA | 20 | - |
| 6 | Rated short-circuit duration | s | 4 | - |
| 7 | Rated peak withstand current | kA | 50 | - |
| 8 | Rated active load breaking current | A | 630 | - |
| 9 | Rated closed-loop breaking current | A | 630 | - |
| 10 | Rated cable charging breaking current | A | 10 | - |
| 11 | Rated no-load transformer breaking capacity | kVA | 1600 | 1600 |
| 12 | Rated short-circuit breaking current | kA | - | 31.5 |
| 13 | Rated transfer current | A | - | 200 |
| 14 | Fuse type | - | SDLAJ-12 SFLAJ-12 | |
| 15 | Striker output energy | J | - | 1+0.5 |
| 16 | Rated short-circuit making current | kA | 50 | 80 (prospective) |
| 17 | Earthing switch rated short-time withstand current | kA | 20 | 20 |
| 18 | Earthing switch rated short-circuit duration | s | 2 | 2 |
| 19 | Earthing switch rated peak withstand current | kA | 50 | 50 |
| 20 | Auxiliary circuit rated voltage | AC 220 / DC 110 | AC 220 / DC 110 | |
| 21 | Mechanical endurance | times | 10000 | 10000 |
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