MR-SafeRing-40.5 Fully insulated inflatable ring switchgear

Summary
SRM16-40.5 series switchgear is indoor 12~40.5kV three-phaseAC50Hz. As a complete set of equipment for receiving and distributing electric energy, it is a new generation of switchgear products produced by our company. It is mainly used for power transformation and transmission of medium voltage power systems such as various power plants, substations, industrial and mining enterprises, subways, civil and commercial buildings for control, protection and monitoring. It is characterized by reliable performance, strong adaptability and small size.
Environmental conditions
◆ Ambient air temperature
Maximum temperature:40C; Minimum temperature: -25°C; The average value measured within 24h shall not exceed 35C.
◆ Relative humidity
The average value of relative humidity measured within 24h shall not exceed 95%;
The average monthly relative humidity shall not exceed 90%;
Condensation may occur when the temperature changes rapidly during high humidity;
The average value of water vapor pressure measured within 24h 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 obviously polluted by dust, smoke, corrosive and combustible gases, steam or salt mist.
Note: When the use conditions exceed the above provisions, the solution can be determined through consultation with the user.
Compliance with standards
GB3906-2011 3.6kV~40.5kVAC Metal Enclosed Switchgear and Control Equipment
DL/T404-1997 Technical Conditions for Ordering Indoor AC High Voltage Switchgear
IEC 62271-200:2003AC metal enclosed switchgear and control equipment with rated voltage above 1kV and below 52kV
1016001/003-0000-00General Technical Specifications for 12kV, 24kV and 40.5kV High Voltage Switchgear of State Grid Corporation of China


Note:
a) The rated short-circuit breaking current of 40.5kV/2000A is 31.5kA; Rated short-circuit breaking current of 12kV/3150A is 31.5kA;
b) The parameters of rated peak withstand current and rated short-time withstand current of current transformer shall be assessed separately;
c) The loop resistance refers to the measured value measured from the outgoing line of the bus coupler socket (including the bus coupler) to the outgoing line side of the cable socket (including the current device). When the bus coupler and the current device are not included, the value in the table is subtracted by 20.
Inflatable compartment parameters
1) The operating pressure of the pressure relief device of the inflatable compartment is 0.2MPa~0.25MPa;
2)The water content of SF6 gas shall be no more than 250ppm after standing for 38 hours after inflation of the inflatable compartment, and the water content of SF6 gas shall be no more than 1000ppm during site acceptance. See DL/T 603-20060for reference standards.
Cabinet structure description
The switchgear is an assembled metal enclosed switchgear with low pressure SF6 gas insulation for the main circuit and vacuum circuit breaker for the main switch. The inflatable compartment is dividedinto two compartments, the circuit breaker compartment and the main busbar compartment. All main circuit elements (vacuum circuit breaker, three position disconnector),main bus and branch bus are installed inside the inflatable compartment. The switch cabinet structure can be divided into circuit breaker inflatable compartment, main bus inflatable compartment, cable compartment, operating mechanism room, instrument room, small bus compartment, etc. according to its functions. The inflatable compartment and cable chamber are equipped with independent pressure release channels to maximize personal safety and equipment operation.
The circuit breaker inflation compartment and the main bus inflation compartment of the switch cabinet are welded with thin high-quality stainless steel plates, and the switch cabinet shell is assembled after being bent and formed with high-quality steel plates.

The main technical parameters are shown in Table 2. After the circuit breaker is assembled and adjusted, its mechanical characteristic parameters are shown in Table 3. The technical data of the secondary circuit are shown in Table 4. The technical data of the auxiliary switch are shown in Table 5.



Optional configuration
◇ According to different unit schemes and user requirements, the following configurations can be provided:
◇ Reserved bus expansion and external expansion bus;
◇ Capacitive voltage indicator;
◇ Short circuit and ground fault indicator;
◇ Air pressure indicating device (pointer pressure gauge, density transmitter,etc.);
◇ Electric operating mechanism of three position disconnector;
◇ Auxiliary contact of three position disconnector;
◇ Arrester;
◇ Voltage sensor (with PT for protection);
◇ Current transformer;
◇ Integrated monitoring unit.
Cabinet installation
SRM16-40.5 series switchgear must be fixed on the ground with four M16x60 bolts. All unit modules are installed in the same way. The schematic diagram of the switchgear foundation is shown in Figure 11.The construction of switchgear installation foundation shall comply with the relevant provisions in the"Technical Code for Construction and Acceptance of Electric Power Construction".The switch cabinet is usually installed in the distribution room, and is fastened on the prefabricated foundation frame of channel steel which is preset on the concrete floor of the distribution room by means of electric welding or bolt connection. The installation of foundation is generally completed by pouring concrete twice. During the first pouring, embedded parts shall be installed for the switch cabinet and the foundation channel steel frame shall be laid. The second concrete is the supplementary layer of the ground. When pouring, the concrete ground height should be 2-5mm lower than the channel steel plane.
◇ The formation of the primary and secondary cable trenches of the switchgear depends on the number of switchgear and building conditions. The construction must be carried out in strict accordance with the foundation drawing provided by us, so as not to affect the consolidation work. When the foundation frame is buried, it is necessary to ensure that:
◇ The flatness tolerance of foundation channel steel shall not be greater than 2mm/m;
◇ The straightness tolerance of the foundation channel steel shall not exceed 2mm/m, and the total deviation within the total length of the frame shall not exceed 5mm/m;
The levelness tolerance of the foundation channel steel shall not exceed - 2mm/m, and the total deviation within the total length of the frame shall not exceed 5mm/m.
After arriving at the site, the service personnel can observe and test the installation foundation. If the above burial conditions are not met, the service personnel shall report to their responsible personnel and communicate with the responsible department of the company to solve the problem, so as not to affect the merging of the switchgear.