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Outdoor high-voltage SF6 circuit breaker type LW36-72.5 126
The high-voltage autogas SF6 circuit breaker LW36-72.5/126(G) is designed for use in AC power systems with a frequency of 50 Hz and a voltage of 110 kV.
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Product Description
The high-voltage autogas SF6 circuit breaker LW36-72.5/126(G) is designed for use in AC power systems with a frequency of 50 Hz and a voltage of 110 kV. The switch performs the functions of a control and protection device in power systems, and can also be used as a sectional switch. The product complies with the requirements of GB1984 “High Voltage AC Circuit Breakers” and IEC 56 “High Voltage AC Circuit Breakers”.
The circuit breaker uses SF6 gas (SF₆) as an insulating and arc-extinguishing medium. The operating principle is based on autogas arc extinguishing. The switch is equipped with a CT-20 spring drive. Distinctive features are high breaking capacity, low energy consumption per drive, highly specialized settings for specific operating conditions. The possibility of remote and local control is provided. The design is simple, compact, low consumption of materials, high reliability, ease of installation and low noise level.
The main purpose is to switch on and off rated currents, short-circuit currents, as well as switching power lines to ensure protection, control and operation of power transmission and distribution systems. The switch provides the possibility of three-phase shutdown and fast automatic restart.
| No. | Name | Unit change | LW36-126 | LW36-72.5 | |||
| 1 | Rated voltage | kV | 126 | 72.5 | |||
| 2 | Isolation level | Rated short-time power frequency test voltage (1 min rms, dry and wet tests) | between open contacts | kV | 230 | 160 | |
| between poles or pole-ground | 230 | 160 | |||||
| between open contacts contacts | 550 | 350 | ||||
| between poles or pole-ground | 550 | 350 | |||||
| Power frequency test voltage for 5 min at zero excess gas pressure SF₆ | between open contacts and pole-ground | 95 | 55 | ||||
| 3 | Rated frequency | Hz | 50 | ||||
| 4 | Rated current | A | 1250/1600/2000/2500/3150 | ||||
| 5 | Rated short circuit breaking current | kA | 31.5/40 | 31.5 | |||
| 6 | Rated short-time current | kA | 40 | ||||
| 7 | Rated peak current withstand current | kA | 100 | ||||
| 8 | Short circuit current duration | with | 3 | ||||
| 9 | Rated short-circuit inrush current (peak) | kA | 100 | ||||
| 10 | Tripping current for short circuit in the near zone | kA | 28.5/23.6; 36.0/30.0 | 28.5/23.6 | |||
| 11 | Rated line charging current interruption current | A | 31.5 | 10 | |||
| 12 | Total number of operations at rated short-circuit current | cycles | 10 | 8 | |||
| 13 | Number of shutdown operations at rated short-circuit current | cycles | 20 | ||||
| 14 | First breaking pole coefficient | — | 1.5 | ||||
| 15 | Gas pressure SF₆ (20°C) | MPa | 0.5±0.015 | 0.4±0.015 | |||
| 16 | Rated voltage of control and auxiliary circuits | DC220/DC110 | |||||
| 17 | Nominal sequence of operations | O-0.3s-CO-180s-CO | |||||
| 18 | Mechanical characteristics | Upper and lower limits of shutdown time | ms | 36+5 | |||
| Upper and lower ON time limits | ms | 100±20 | |||||
| 19 | Rated Main Circuit Resistance | µOhm | ≥65 | ≥60 | |||
| 20 | Mechanical durability of the circuit breaker | cycles | 6000 | ||||
| 21 | Static load on clamps | Horizontal longitudinal Fsh | N | 1250 | 750 | ||
| Horizontal transverse Fsh | 750 | 500 | |||||
| Vertical Fsh | 1000 | 750 | |||||
| 22 | Annual SF₆ gas leak | % | ≤1% | ||||
| 23 | Gas humidity SF₆ | ×10⁻⁶ | ≤150 | ||||
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