SRM6-40.5 Fully Enclosed, Fully Insulated, Gas-Filled Ring Network Switchgear

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SRM6-40.5 Fully Enclosed, Fully Insulated, Gas-Filled Ring Network Switchgear

SRM6-40.5 Fully Enclosed, Fully Insulated, Gas-Filled Ring Network Switchgear

The SRM6-40.5 Fully Enclosed, Fully Insulated, Gas-Filled Ring Network Switchgear is a medium-voltage power distribution unit designed for three-phase AC systems with a rated voltage of 40.5kV and a frequency of 50Hz.

Product Advantages
Completely Sealed System
All high-voltage components are enclosed in a stainless-steel tank filled with SF₆ gas to maintain insulation and arc-extinguishing properties.The sealed tank is factory-filled and requires no gas replenishment under normal operating conditions.

Modular and Compact Design
The switchgear's modular layout allows for configuration flexibility, making it adaptable to different grid topologies.Its compact footprint supports installation in confined spaces such as substations, industrial plants, and underground facilities.

Operational Security and Reliability
Internal arc fault containment and pressure relief mechanisms are incorporated to support personnel safety.The system design ensures consistent operation across varying environmental conditions, including temperature and humidity variations.

Product Features
SF₆ Gas Insulated and Metal-Clad Construction
The sealed stainless-steel tank contains load break switches, vacuum circuit breakers, and other components, all isolated from external elements.The design limits oxidation, contamination, and moisture intrusion, contributing to prolonged service life.

Flexible Functional Unit Combinations
Modules include load break switches, vacuum circuit breaker units, metering units, and cable switching units.Each module is pre-tested and assembled for seamless integration into the overall system.

◇GB3906-2011 "3.6kV-40.5kV AC Metal Enclosed Switchgear and Control Equipment"
◇DL/T404-1997 "Technical Conditions for Ordering Indoor AC High Voltage Switchgear"
◇IEC 62271-200:2003 "AC metal enclosed switchgear for rated voltages above 1kV and below 52kV"
◇1016001/003 0000 00 "General Technical Specification for 12kV, 24kV, and 40.5kV High Voltage Switchgear of State Grid Corporation of China Material Procurement Standards"

◇Surrounding air temperature Maximum temperature: 40 ℃ Minimum temperature:-25℃; And the average value measured within 24 hours shall not exceed 35℃.
◇Relative humidity The average relative humidity measured within 24 hours shall not exceed 95%; The average monthly relative humidity shall not exceed 90%; During periods of high humidity, condensation may occur due to sudden changes in temperature; The average value of water vapor pressure measured within 24 hours shall not exceed 2.2kPa; The average monthly water vapor pressure shall not exceed 1.8kPa; 
◇Altitude The altitude of the equipment installation site shall not exceed 1000m.
◇The seismic intensity shall not exceed 8 degrees.
◇The amplitude of electromagnetic interference induced in the secondary system shall not exceed 1.6kV.
◇The surrounding air is not significantly polluted by dust, smoke, corrosive and combustible gases, vapors, or salt mist 
Note: When the usage conditions exceed the above regulations, a solution can be determined through consultation with the user.

Serial Number Project Unit Parameter
1 Rated voltage kV 12 40.5
2 Rated current A 1250-3150 1250~2500
3 Rated frequency Hz 50
4 Rated short time withstand current k/Vs 25、315
5 Rated peak withstand current KA 63、80
6 Rated short-circuit current duration S 25、315
7 Rated short-circuit breaking current KA 63、80
8 Rated short-circuit making current KA 0.5
9 Arc duration S 2000 1000
10 Mechanical life Circuit breaker Times 3000
lsolation switch 3000
Grounding switch 30
11 Circuit breaker electrical life Times 0.05
12 Ratedinflation pressure(20℃ gauge pressure) MPa 0.03
13 Minimum functional pressure (20'c gauge pressure) ≤0.5%
14 Annual leakage rate of SF6 gas
15 Rated insulation Edge level Rated power frequency 1min
Withstand voltage (effective
value)
Phase to phase kV 42 95
lsolation fracture,
vacuum fracture
48 118
Rated lightning impulse
resistance
Received voltage (peak)
Phase to phase kv 75 185
lsolation fracture,vacuum fracture 85 215
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