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 (Ud, Up, ) |
Power frequency withstand voltage(Ud) (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 |
μΩ |
≤120 |
||
2500A |
μΩ |
≤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