ASNA busbar PT unit
Users may adopt single-phase, V-V or star-delta wiring schemes for different projects. For PTs with star-delta wiring, a harmonic suppressor must be fitted to safeguard PT neutral insulation against damage from system resonance.
ASNA busbar PT unit
The ASNA busbar PT unit(symbol:PT) samples busbar voltage via voltage transformers, outputs secondary voltage signals for metering and protective relays, and can also supply auxiliary power to secondary circuits. Users may adopt single-phase, V-V or star-delta wiring schemes for different projects. For PTs with star-delta wiring, a harmonic suppressor must be fitted to safeguard PT neutral insulation against damage from system resonance.
Core functions
Measuring Voltage Supply - Output: AC 100 V measuring voltage
Secondary Power Supply -Power output: AC 220 V / AC 230 V
Easy Maintenance: The unit is equipped with a three-position disconnector. When the PT malfunctions, the disconnector can be disconnected for maintenance while the busbar remains energized.
Parameter List
| Name | Unit | Parameter | |||
| Rated voltage(Ur) | kV | 24 | |||
| Rated frequency(fr) | Hz | 50 | |||
| Rated current(lr) | A | 630 | 1250 | ||
| Rated Short-duration power-frequency withstand voltage(Ud) | Common value | kV | 50 | ||
| Across the isolating distance | 60 | ||||
| Rated Lightning impulse withstand voltage(up) | Common value | kV | 125 | ||
| Across the isolating distance | 145 | ||||
| Rated short-time withstand current(lk) | kA | 20 | 25 | ||
| Rated short-time duration(tk) | s | 4 | |||
| Rated peak withstand current(lp) | kA | 50 | 63 | ||
| Rated short-circuit making current(lma) | Three-position disconnector | kA | 50 | 63 | |
| Mechanical endurance | Three-position disconnector | time | 3000 | ||
| Electrical endurance | Earthing Switch | class | E2 | ||
| Degree of protection by enclosure | IP4X | ||||
| Degree of protection by Fully Sealed tank | IP65 | ||||
| Dimension Low voltage chamber not included | W(mm) | 720 | |||
| D(mm) | 850 | ||||
| H(mm) | 1890 | 1940 | |||
Busbar PT Unit Structure
| Name | Unit | Parameter | ||
| Rated voltage(Ur) | kV | 12 | ||
| Rated frequency(fr) | Hz | 50 | ||
| Rated continuous current(lr) | A | 630 | 1250 | |
| Rated short-duration power-frequency withstand voltage(Ud) | Common value | kV | 28 | |
| Across the isolating distance | 32 | |||
| Rated lightning impulse withstand voltage(Up) | Common value | kV | 75 | |
| Across the isolating distance | 85 | |||
| Rated short-time withstand current(Ik) | kA | 20 /25 | 20/25/31.5 | |
| Rated short-time of short-circuit(tk) | s | 4 | ||
| Rated peak withstand current(Ip) | kA | 50 / 63 | 50/63/80 | |
| Rated short-circuit making current(Ima) | Three-position disconnector | kA | 50 / 63 | 50/63/80 |
| Mechanical endurance | Three-position disconnector | time | 3000 | |
| Electrical endurance | Earthing Switch | class | E2 | |
| Degree of protection by enclosure | IP 4X | |||
| Degree of protection by fully sealed tank | IP 65 | |||
| Dimensions Low voltage chamber not included |
W(mm) | 600 | ||
| D(mm) | 800 | 900 | ||
| H(mm) | 1640 | 1810 | ||
Application
Questions and answered
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