Product Overview
GRM6-40.5 Series are a new type SF6 gas-insulated compact switchgears. Circuit breakers, disconnectors, and other parts are enclosed in 3mm-thick metal containers filled with a low-pressure SF6 gas. Thus, the equipment is compact, reliable, and safe; free of environmental impacts, free maintenance and long service life, etc.
GRM6-40.5 Series switchgears are suitable for control, protection and monitoring of 40.5 kV, three-phase, single busbar electrical system, widely used in generating companies, mining, etc.
Applicable Standars
IEC 62271-1：High-voltage switchgear and controlgear-Part 1: Common specifications
IEC 62271-100 :High-voltage switchgear and controlgear–Part 100: Alternating-current circuit-breakers
IEC 62271-102 High-voltage switchgear and controlgear–Part 102: Alternating current disconnectors and earthing switches
IEC 62271-103 High-voltage switchgear and controlgear–Part 103: Switches for rated voltages above 1 kV and up to and including 52 kV
IEC 62271-105 High-voltage switchgear and controlgear–Part 105: Alternating current switch-fuse combinations
IEC 62271-200：High-voltage switchgear and controlgear–Part 200: AC metal-enclosed switchgear and controlgear for rated voltage above 1kV and up to and including 52 kV
IEC 60044-2:Instrument transformers–Part 2: Inductive voltage transformers
IEC 60044-1:Instrument transformers–Part 1:Current transformers
Use Conditions
Altitude: ≤4000m★
Ambient air temperature: -25℃~+40℃;
Relative air humidity: daily average ≤95%, monthly average ≤90%;
Seismic intensity ≤8 class;
Places free from fire, explosion, serious contamination, chemical corrosion and severe vibration.
Note★: The manufacturer must be consulted in advance if site altitude is over 1000 m so as to adjust the inflation pressure.
Model number definition
Main Technical Parameters
| No. | Descriptions | Unit | Value | |||
| 1 | Rated voltage | kV | 40.5 | |||
| 2 | Rated frequency | Hz | 50 | |||
| 3 | Rated continuous current | A | 1250, 2500 | |||
| 4 | Rated insulation level (Out, Up, ) | Power frequency withstand voltage(Out) (1min) | Between phase and phase to earth | kV | 95 | |
| Across the isolating distance | kV | 118 | ||||
| Auxiliary and control circuits (Ua) | kV | 2 | ||||
| Lightning impulse withstand voltage (Up) | Between phase and phase to earth | kV | 185 | |||
| Across the isolating distance | kV | 215 | ||||
| 5 | Rated short-time withstand current (Ik/tk) | kA/s | 25/4, 31.5/4 | |||
| 6 | Rated peak withstand current (Ip) | kA | 63, 80 | |||
| 7 | Rated short-circuit breaking current (Isc) | kA | 25, 31.5 | |||
| 8 | Rated short-circuit making current | kA | 63, 80 | |||
| 9 | Circuit breaker electrical endurance | / | 30 times | |||
| 10 | Rated operating sequence. | / | O-0.3s-CO-180s-CO | |||
| 11 | Mechanical endurance | Circuit breaker | Ops | 20000 | ||
| Disconnectors/Earthing switches | Ops | 5000 | ||||
| 12 | Resistance of the circuit | 1250A | mΩ | ≤120 | ||
| 2500A | mΩ | ≤80 | ||||
| 13 | Rated gas- filled pressure (the pressure at 20 °C) | MPa | 0.02 | |||
| 14 | Annual leakage rate (relative pressure) | / | ≤0.01% | |||
| 15 | Isolation medium | / | SF6 | |||
| 16 |
Degree of protection (IP) | Isolation medium | / | IP2XC | ||
| Gas tank | / | IP67 | ||||
| Enclosure | / | IP41 | ||||
| Enclosure | / | IK10 | ||||
| 17 | Classification IAC and Internal IAC | / | A-FLR , 31.5 kA 1s | |||
Outline dimension
