MR-SafeRing-12 Fully insulated inflatable ring switchgear

Summary
The MR-SafeRing-12/24inflatable SF6 metal enclosed full insulation series ring network switch cabinet produced by our company has passed the type test of the National High Voltage Electrical Apparatus Test Center and been listed as the national high-tech product in the national high-tech project. The products are widely used in10kV/6kV power distribution systems, and are the selected switch products for various urban and rural user power transformation and distribution systems.
The switch cabinet is a modular unit mode, which can be combined according to different purposes; It consists of fixed unit MR-SafeRing-12/24 gas filled switchgear is a completely sealed system, and its live parts and switches are enclosed in a stainless steel body. The whole switch device is not affected by external environmental conditions, thus ensuring operation reliability and personal safety. And maintenance free is realized. By selecting the expandable bus, any combination can be realized to achieve full modularization. The safety insulation and shielding of the extended bus ensure the reliability and safety.
MR-SafeRing-12/24 inflatable switch cabinet can also provide TV based automation solution, forming the concept of intelligent combination and expandable unit to meet the flexible use needs of compact switchgear in various substations.switch, and minimizing the on-site installation and commissioning workload.
The MR SafeRing-12/24 inflatable switch cabinet is divided into non expandable standard configuration and expandable standard configuration. Due to the combination of full module and half module and self expandability, it has very special flexibility.
The design life of operation under indoor conditions (20 ℃ ) exceeds 30 years.
Main features of the product
◆ Operation safety
Through the following security measures, we can provide users with special security :
◇ Integrated three station load switch ;
◇ The circuit breaker uses the load switch instead of the isolating switch, which is more safe and reliable ;
◇ Full dense design of electrified body ;
◇ Mechanical interlocking to meet five requirements;
◇ Live display can provide live instructions for incoming and offline lines.
◆ Reliable operation
Fully sealed design, all 10/20kV switches and busbar live bodies are sealed in the gas box welded by 3mm stainless steel plate;
with silicone rubber cable plug, the cable head is fully insulated and fully sealed, so as not to be affected by dust, humidity,small animals and other external environment.
◇ The spring energy storage mechanism can be operated manually or electrically.
◇ Panel analog line diagram provides switch position indication.
◇ The cabinet is made of aluminum zinc plate, with electrostatic spraying on the surface to enhance corrosion resistance.
◇ Pressure gauge monitors theSF6 gas pressure range in the tank.
◆ Economy
◇ Maintenance free
◇ Highly reliable
◇ The service life can be up to 30 years
◆ Flexible scheme
◇ A variety of incoming lines can achieve the left, right, upper or forward lines
◇ A variety of combinations, and any combination of units can be realized
◇ The insulation busbar can be used to realize the front and rear cabinets or the left and right cabinets
◇ Design flexibility
◆ Widely used
MR-SafeReng-12/24 series indoor AC high-voltage gas insulated metal enclosed switchgear (hereinafter referred to as "gas filled cabinet") is a new generation of switchgear. The main switch can be either a vacuum circuit breaker with permanent magnetic mechanism or a vacuum circuit breaker with spring mechanism. The whole cabinet is insulated with sulfur hexafluoride gas, which is compact and expandable, and is suitable for power distribution automation. The inflatable cabinet has the characteristics of compact structure, flexible operation, reliable interlocking, etc. It can provide satisfactory technical solutions for various applications (especially in places with harsh environment) and different user requirements. The adoption of sensing technology and protective relay, together with advanced technical performance and light and flexible assembly scheme, can fully meet the different needs of users. The gas filled cabinet is suitable for small secondary substations, switching stations, box type substations, residential quarters, industrial and mining enterprises, large shopping malls of the power system, especially for airports, subways, railways and other places with high requirements for electricity.
Design description
◆ Technical specification
MR-SafeRing-12/24 series inflatable switchgear is installed on a frame coated with aluminum zinc plate. The switching unit is in the SF6 gas tank, which is made of corrosion resistant and nonmagnetic 3mm thick stainless steel plate.
The SF6 gas tank is a "seal pressure system" which can run for 30 years under normal working conditions. When the SF6 gas is working normally, the pressure is 0.15~0.4bar. The gas tank is equipped with a pressure relief device. When the pressure is too high, the gas can be released from the bottom or the rear part.
◆ Switch unit
Load switch adopts coaxial rotating double breakpoint mode, and operates with sliding plate through the same operating hole. Therefore, the switch can only be in one of the three states of "closing, dividing and grounding" at any time, thus avoiding misoperation thoroughly.
◆ Operating mechanism
The operating mechanism of the switch is installed in the front of the air box. After special process treatment, it is rust-proof,convenient for manual operation and maintenance, and easy to realize electric operation.
Performance Indicator
◆ SF6 gas pressure : Absolute pressure 1.4bar at 20°C
Annual gas leakage rate : 0.2%/Year
Protection level : IP67
Stainless steel thickness of air chamber : 3.0mm
◆ Bus
Bus bar in switch cabinet : 400mm2Cu
Switchgear ground bus : 150mm2Cu
◆ Color
Switch cabinet front panel : RAL7012
Side panels and front cover of the cable compartment : RAL7035
◆ Normal operating environmental conditions
Maximum temperature : 40℃
Minimum temperature : -40℃
Maximum average relative humidity : ≤95%
Altitude : ≤2000m
◆ Meet the standard
GB/T11022 GB3906 GB1985
GB16926 GB38041 GB1984
GB3309
IEC60056 IEC60129 IEC60265
IEC60298 IEC60420 IEC60694




Non-Extended Standard Module
The following eighteen standard combinations are provided.
Each module of the MR-SafeRing-12/24switchgear has the following configuration
◆ D cabinet - lifting module
◇Standard configuration characteristics of "cable connection module without grounding knife"
◆ C cabinet - load switch module
◇Standard configuration characteristics of "load switch module"
◆ F cabinet - load switch fuse combination electrical module
◇Standard configuration characteristics of "load switch fuse combiner module"
◆ V cabinet vacuum circuit breaker module
◇Standard configuration characteristics of "vacuum circuit breaker"
Content
◇ Capacitance voltage indicator for incoming bushing
◇ A SF6 density pressure gauge is installed in each chamber
◇ Lifting lugs for lifting purposes
◇ Operation handle
Selection
◇ Electric operation mechanism
◇ Cable short circuit and ground fault indicator
◇ Current transformer and meter
◇ Remote monitoring
◇ Microcomputer integrated protection device


Common box scheme
The ordinary combination consists of 2-8 basic modules, with a total length of not more than2800mm.
More than this length will be expanded by extension. The basic modules can be selected in C, F,V, SL and D.


Extended module - Load switch module c

◆ Standard configuration and characteristics
◇ 630A bus bar
◇ Three-position single-spring operating mechanism with two independent load switches and grounding switching operating shafts
◇ Three station load / ground switch
◇ Position indication of load switch and ground switch
◇ Horizontal outlet bushing in front, 630A series bolted bushing.
◇ Capacitance voltage indicator for indicating sleeve electrification
◇ For all the switch functions, there is a convenient padlock device on the panel.
◇ SF6 gas pressure gauge (only one in each SF6 gas tank).
◇ Grounding bus bar
◇ Interlock between earthing switch and front panel of cable room.
◇ Front panel of switchgear
◇ Side panels and cable compartment front covers.
◆ Optional configuration and characteristics
◇ Reserved bus expansion
◇ External busbar
◇ Load switch operation motor 24V/48V DC, 110V/220V DC/AC
◇ Short circuit and ground fault indicator
◇ Measuring ring current transformer and ammeter.
◇ Measuring ring current transformer and watt hour meter
◇ Install Zinc Oxide arrester or double cable head in the cable inlet casing.
◇ Key interlock
◇ Incoming line live grounding locking (when the casing is electrified, grounded switch)110V/220VAC/DC
◇ Auxiliary contact
Load switch location 2NO+2NC
Grounding switch location 2NO+2NC
A pressure gauge with signal 1NO
Arc extinguishing device with signal contacts 1NO
◇ The two device can be installed in
Two line chambers at the top of switchgear cabinets
Low pressure box at the top of switch cabinet
MR-SafeRing-12/24 Fully insulated inflatable ring switchgear
Extension module - Cable connection module with grounding knife De

◆ Standard configuration and characteristics
◇ 630A bus bar
◇ Earthing switch
◇ Two working single spring operating mechanism
◇ Position indication of grounding switch
◇ Horizontal outlet bushing in front, 630A series bolted bushing.
◇ Capacitance voltage indicator for indicating sleeve electrification
◇ For all the switch functions, there is a convenient padlock device on the panel
◇ SF6 gas pressure gauge (only one in each SF6 gas tank)
◇ Grounding bus bar
◇ Interlock between earthing switch and front panel of cable room
◆ Optional configuration and characteristics
◇ Reserved bus expansion
◇ External busbar
◇ Short circuit and ground fault indicator
◇ Measuring ring current transformer and ammeter.
◇ Measuring ring current transformer and watt hour meter
◇ It is possible to install lightning arresters or double cable heads at the cable inlet bushing.
◇ Key interlock
◇ Incoming line electrified grounding locking (when the casing is electrified, locked grounding switch) 110V/220V AC/DC...
◇ Auxiliary contacts
Location of ground switch 2NO+2NC
A pressure gauge with signal 1NO
Arc extinguishing device with signal contacts 1NO
◇ The two device can be installed in
Two line chambers at the top of switchgear cabinets
Low pressure box at the top of switch cabinet

Extension module - Cable connection module without grounding knife D
◆ Standard configuration and characteristics
◇ 630A bus bar
◇ Horizontal outlet bushing in front, 630A series bolted bushing
◇ Capacitance voltage indicator for indicating sleeve electrification
◇ SF6 gas pressure gauge (only one in each SF6 gas tank)
◇ Grounding bus bar
◆ Optional configuration and characteristics
◇ Reserved bus expansion
◇ External busbar
◇ Short circuit and ground fault indicator
◇ Measuring ring current transformer and ammeter.
◇ Measuring ring current transformer and watt hour meter
◇ It is possible to install lightning arresters or double cable heads at the cable inlet bushing.
◇ The two device can be installed in
Two line chambers at the top of switchgear cabinets
Low pressure box at the top of switch cabinet

Extension module - Load switch fuse combination electrical module F
◆ Standard configuration and characteristics
◇ 630A bus bar
◇ Three-position load switch, the first end of the fuse and the end of the fuse grounding switch for mechanical linkage three-position double spring operating mechanism, two independent load switches and grounding switch operating shaft load switch and grounding switch position indication
◇ Fuse box
◇ Horizontal placement of fuses
◇ Fusing trip indication
◇ Horizontal outlet bushing in front, 200A series plug-in bushing.
◇ Capacitance voltage indicator for indicating sleeve electrification
◇ For all the switch functions, there is a convenient padlock device on the panel.
◇ SF6 gas pressure gauge (only one in each SF6 gas tank).
◇ Grounding bus bar
◇ Fuses parameters for transformer protection
12kV, max 125A fuse
24kV, Max 63A fuse
◇ Interlock between earthing switch and front panel of cable room.
◆ Optional configuration and characteristics
◇ Reserved bus expansion
◇ External busbar
◇ Parallel trip coil 24V/48V DC,110V/220V DC/AC
◇ And combined brake coil 24V/48V DC, 110V/220V DC/AC
◇ Measuring ring current transformer and ammeter.
◇ Measuring ring current transformer and watt hour meter
◇ Incoming line live grounding locking (when the casing is electrified when the grounding switch is closed) 110V/220V AC/DC
◇Auxiliary contacts
Load switch location 2NO+2NC
Grounding switch location 2NO+2NC
Fuse fuse 1NO
A pressure gauge with signal 1NO
Arc extinguishing device with signal contacts 1NO
◇ The two device can be installed in
Two line chambers at the top of switchgear cabinets
Low pressure box at the top of switch cabinet

Extended module - Vacuum circuit breaker module V/630A
◆ Standard configuration and characteristics
◇ 630A bus bar
◇ 630A circuit breaker unit for transformer / line protection
◇ Two working mechanism of double circuit springs for vacuum circuit breakers
◇ The three station isolation / earthing switch on the lower part of vacuum circuit breaker
◇ Three station isolation / grounding switch single spring operating mechanism
◇ Mechanical interlocking of vacuum circuit breaker and three station switch
◇ Position indication of vacuum circuit breaker and three station switch
◇ Electronic protection relay
◇ Trip coil (for relay action)
◇ Horizontal outlet bushing in front, 630A series bolted bushing.
◇ Capacitance voltage indicator for indicating sleeve electrification for all the switch functions, there is a convenient padlock device on the panel.
◇ SF6 gas pressure gauge (only one in each SF6 gas tank).
◇ Grounding bus bar
◇ Interlock between earthing switch and front panel of cable room.
◆ Optional configuration and characteristics
◇ Reserved bus expansion
◇ External busbar
◇ The motor used for vacuum circuit breaker operates 24V/48V DC,110V/220VDC/AC
◇ Parallel trip coil 24V/48V DC, 110V/220V DC/AC
◇ And combined brake coil 24V/48V DC, 110V/220V DC/AC
◇ Measuring ring current transformer and ammeter.
◇ Measuring ring current transformer and watt hour meter
◇ Key interlock
◇ Incoming line live grounding locking (when the casing is electrified when the grounding switch is closed) 110V/220V AC/DC
◇ Auxiliary contacts
Location of vacuum circuit breaker 2NO+2NC
Isolation switch location 2NO+2NC
Grounding switch location 2NO+2NC
Vacuum circuit breaker trip signal 1NO
A pressure gauge with signal 1NO
Arc extinguishing device with signal contacts1N0
◇ The two device can be installed in
Two line chambers at the top of switchgear cabinets
Low pressure box at the top of switch cabinet
◇ Other relays
Extended module - Vacuum circuit breaker module SvBr

◆ Standard configuration and characteristics
◇ 630A bus bar
◇ 630 A vacuum circuit breaker
◇ Two working mechanism of double circuit springs for vacuum circuit breakers
◇ Vacuum circuit breaker lower disconnector
◇ Isolation switch single spring operating mechanism
◇ Mechanical interlocking of vacuum circuit breaker and disconnector
◇ Position indication of vacuum circuit breaker and disconnector
◇ For all switching functions, padlock devices are conveniently installed on the panel.
◇ SF6 gas pressure gauge (only one in each SF6 gas tank)
◇ SvBr is always connected to bus hoist cabinet
◆ Optional configuration and characteristics
◇ External busbar
◇ The motor used for vacuum circuit breaker operates 24V/48V DC,110V/220VDC/AC
◇ Parallel trip coil 24V/48V DC,110V/220V DC/AC
◇ And combined brake coil 24V/48V DC, 110V/220V DC/AC
◇ Key interlock
◇ Auxiliary contacts
Vacuum circuit breaker position 2NO+2NC
Switch disconnector position 2NO+2NC
◇ The two device can be installed in
Two line chambers at the top of switchgear cabinets
Low pressure box at the top of switch cabinet
Extended Module-Bus Grounding Module Be

◆ Standard configuration and characteristics
◇ 630A bus bar
◇ Earthing switch
◇ Two working single spring operating mechanism
◇ Position indication of grounding switch
◇ For all the switch functions, there is a convenient padlock device on the panel
◇ SF6 gas pressure gauge (only one in each SF6 gas tank)
◇ Grounding bus bar
◆ Optional configuration and characteristics
◇ Reserved bus expansion
◇ External busbar
◇ Key interlock
◇ Auxiliary contacts
◇ Location of ground switch 2NO+2NC
◇ A pressure gauge with signal 1NO
◇ The two device can be installed in
◇ Two line chambers at the top of switchgear cabinets
◇ Low pressure box at the top of switch cabinet
Extended Module-Bus Segmented Switch Module (Load Switch) SL

◆ Standard configuration and characteristics
◇ 630A bus
◇ Isolating switch
◇ Single spring operating mechanism
◇ Switch position indication
◇ For all switch functions, there is a convenient padlock device on the panel
◇ SF6 gas pressure gauge (only one place in each SF6 gas tank)
◆ Optional configuration and characteristics
◇ Reserved bus extension
◇ External bus
◇ Electric motor for load switch operation 24V/48V DC, 110V/220V DC/AC
◇ Key interlock
◇ Auxiliary contacts
Load switch position 2NO+2NC
◇ The secondary device can be installed in
The secondary line small room on the top of the switchgear
Low voltage box on top of switch cabinet

Extension Module - Measurement Module M

◆ Standard configuration and characteristics
◇ 2 current transformers
◇ 2 voltage transformers
◇ 6 pieces of 400 series bushings, used for the external bus connection of RMS6-12 inflatable cabinet, top in and top out
◇ Protect PT fuse
◇ WidthXHeightXDepth=696X1806X820mm
◆ Optional configuration and characteristics
◇ 3 current transformers
◇ 3 voltage transformers
◇ Zinc oxide arrester
◇ Capacitive voltage indicator that indicates that the switchgear is live
◇ Low-voltage components
1 voltmeter with transfer switch
1 ammeter with transfer switch
1 Only power meter
1 reactive power meter

Expansion module -PT Module P

◆ Standard configuration and characteristics
◇ 2 voltage transformers
◇ Protect PT fuse
◇ 1 voltmeter with transfer switch
◇ Top entry/exit, 3 (6) bushings are used to connect the external busbar of the switch cabinet
◇ WXHXD=696X1806X820mm
◇ WXHXD=696X1460X820mm
◆ Optional configuration and characteristics
◇ Lightning arrester
◇ Capacitive voltage indicator that indicates that the switch refuses to be charged
◇ 24V Dc charger and battery
◇ Isolating switch

Extended module-vacuum circuit breaker module V/1250A

◆ Standard configuration and characteristics
◇ 1250A/630A bus
◇ 1250A/630A line protection vacuum circuit breaker
◇ Vacuum circuit breaker VD4(VSI) electric operation 110/220V DC/AC
◇ The three-position isolation/grounding switch on the upper part of the vacuum circuit breaker is electrically operated
◇ Protection and control unit (with protection CT)
◇ Shunt trip coil 110V/220V DC/AC
◇ Closing coil 110V/220V DC/AC
◇ Outlet bushing placed horizontally at the front
◇ 1250A/630A series bolted casing
◇ Capacitive voltage indicator to indicate that the bushing is live
◇ Sf6 gas pressure gauge (only one place in each SF6 gas tank)
◇ Width x Height x Depth=696x1806x781mm
◇ Combination order:0-0.3s-CO-180s-CO
◇ Gas pressure sensor
◆ Optional configuration and characteristics
◇ Current sensor
◇ Voltage sensor
Remote control and monitoring unit
The RMS6-12 gas-filled switchgear equipped with integrated remote control, remote measurement, and remote signaling automation modules realizes the intelligent application of ring network switch equipment. Use communication to connect each unit with the superior dispatching center, which can realize the integrated automation of the power distribution system.Distribution network automation allows dispatch operators to understand the operation of the entire distribution network without leaving home, quickly locate faults, automatically or artificially realize fault isolation and network reconstruction, thereby greatly reducing the area and time of power outages and reducing faults The loss caused. In addition, load monitoring and deployment can be carried out conveniently, which is conducive to the rational use of the network.
Matching with the switch cabinet is the distribution network automation system. The system is an open design, including two parts, a sub-station and an automation terminal module. The automation terminal is a distributed modular design with high reliability. At the same time, its compact shape facilitates installation in compact switchgear.
Optional configurations and features
16 switch inputs (single remote signal), isolation voltage 1500VDC
8 analog inputs (remote measurement), including 4 currents (AC5A)
4 voltages (1*24VDC,3*100VDC/220VAC)
6 switch output (remote control, can be used for up to 3 switches)
Type C dry contact,250V AC8A/30V DC8A
1 RS485 communication port for remote communication, the maximum distance can reach 1200m
Select function
Calculation function of feeder P, Q,kwh, F, etc.
Current protection function, can act on switch output or communication output
Using the vacuum switch/Vacuum circuit breaker module
The transformer or line protection is a vacuum switch/vacuum circuit breaker. With protective relay and current transformer.
When a vacuum switch/vacuum circuit breaker is selected as the protection, the standard relay is SPAJ140C or other domestic comprehensive protection relays.
◇ SPAJ140C type over current/short circuit/earth protection relay
Voltage range: DC (18-265V) or AC (80-265V)
Equipped with ASG type protectionCT: secondary current 5A
Digital display of setting value, current measurement value and recorded fault data
Setting value panel button or computer setting
Can provide each section to protect passive signal nodes
Continuous self-check and alarm output of internal faults (software and hardware)
◇ Low fixed value overcurrent section |>
Inverse time limit action current 0.5-2.5InlDMTinverse time limit action mode
◇ High setting value overcurrent section I>
Time limit action current 0.5-5.01n action time 0.05-300s
Action current 0.5-40 In Action time 0.04-300s
◇ Low fixed value zero sequence overcurrent section lo>
Time limit action current 0.1-0.81n action time 0.05-300s
Inverse time limit action current0.1-0.8 InIDMT inverse time limit action mode
◇ High-value zero-sequence overcurrent section lo>
Action current0.1-10 In Action time0.05-300s
Product principle block diagram
①SF6 barometer ② Live display ③ Closing and opening position indication ④ Grounding position indication ⑤ Operation hole of load switch ⑥ Operating hole of grounding switch ⑦ Switch operating position selects sliding plate
Transformer/Line protection
RMS6-12 inflatable cabinet provides two transformer protection methods: load switch fuse combination electrical appliances and circuit breakers with relay protection.
Fuse combination module using load switch
Transformer protection is a combination of current-limiting high-voltage fuse and load switch. The fuse compartment will be installed behind a separate enclosure with a lock at the front of the unit. The load switch uses a spring energy storage mechanism, which can be triggered by the striker of the fuse.
In order to facilitate the replacement of the fuse. The operating handle can be used to remove the end cover of the fuse compartment. The trip mechanism of the fuse is in front, which ensures the waterproof performance of the entire system.



Partition design of cabinet
◆ Cable room
The cable installation space of the inflatable cabinet is abundant, and the cable connection height reaches 600 mm. The cables of each unit are separated by aluminium-zinc coated sheets, which is convenient for maintenance and repair. Most of the remaining space can be equipped with current transformers and other control and protection devices.
Prefabricated cable connectors are used for cable connection, and shielded and non-shielded connectors can be used for connectors, as well as lightning arresters.
For double cables to enter the cable and install lightning arresters, it is necessary to use a deepened cable chamber cover plate,and the bottom of the cable chamber is equipped with a ground bus.
◆ Pressure release chamber The pressure release chamber is open and located at the lower back of the cabinet. It is totally isolated from other compartments.
There are pressure relief valves at the lower part of the gas tank. The number of pressure relief valves is equal to the number of loops. When a major accident occurs and the protective device fails, the high-pressure gas generated in the gas tank releases pressure through the pressure relief valve, thus ensuring the safety of operators and adjacent equipment.
◆ Switch bus room
In addition to the fuse sealing chamber, the other parts of the stainless steel gas tank constitute the switch-bus chamber.
The three-phase load switch is loaded into the gas tank after debugging as an integral part. The switch structure is rotary three-position, which has both isolation and grounding functions. The static contact of the switch is equipped with a metal fence,which is curved, so as to enhance the traveling effect when arc extinguishing.
In order to optimize the electric field distribution in the gas tank, the main bus is designed as a rectangular copper bar with R5 rounded corners, and the loop bus and transformer bus are copper rods of ф20 and ф10, respectively. Metal shield covers are installed on the parts that may cause the local electric field tip, such as bus connection and fixed position, in order to uniform the electric field and improve the insulation strength.
◆ Operating room
The operating mechanism room is located in the upper half of the inflatable cabinet. The mechanism roller is tightly matched with the switch operating disc and is fixed by bolts.
The mechanism is divided into single spring (feeding mechanism) and double spring (outgoing mechanism) to form loop circuit and transformer circuit switch. The spring is disc spring, which has the characteristics of high assembly accuracy, small operation force, long service life and high stability.
◆ Fuse chamber The fuse chamber (fuse sealing chamber) is located in the middle of the inflatable cabinet and in the gas tank filled with SF6 gas.
The fuse sealing bin is composed of epoxy resin insulating cylinder poured by APG process and upper conductive and lower conductive electrodes (end caps). The upper and lower conductive electrodes are equipped with switch opening. The front door has fuse action indicator for easy observation and maintenance. The fuse can be easily replaced by unscrewing the end cap with the operating handle.
Attachment

Vacuum circuit breaker unit: V
◆ Voltage transformer
MR-SafeRing-12/24 series switchgear can be equipped with 10kV/24 full-closed voltage transformer to meet the requirements of distribution automation. It can be used to provide voltage signal for measurement and switching power supply for electric operation mechanism.
Single/Three-phase can be selected according to need
◇ ratio: 10/0.1/0.22kV;24/0.1/0.22 kV
◇ Accuracy (AC100V):0.2 or 0.5
◇ Fully insulated and fully sealed busbar structure for special parallel cabinet
◇ Special parallel cabinet bus
◇ Fully insulated and sealed structure
◆ Fuse
Users can configure themselves according to their needs. Our company can also recommend configurations and provide them according to applicable standards.
Our company recommends the use of HVHRC fuses, which are backup fuses with temperature safety devices, to prevent equipment damage caused by abnormal overheating in the fuse barrel. When ordering, please indicate the rated capacity of transformers, working voltage and rated current of fuses.
◆ Protective relay FTB-3000
Passive digital self-powered multi-function time over-current protection relay is adopted. Compact design, strong adaptability,meet VDE requirements-0435-303,IEC255,VDE0843.
No additional power supply is required
Operation mode of self-contained safety protection
Wide setting range and simple operation steps
Processing signal with microprocessor to achieve high precision parameter measurement
Adopt internal self-test (watchdog) design, reliable operation
Protection function is optional
Timed Overcurrent Protection(DMT)
Inverse Time Overcurrent Protection(IDMT)
Inverse time curve is optional:
General inverse time limit
Very inverse time limit
Extreme inverse time limit


◆ Auxiliary contact point
All load switches and grounding switches can be equipped with auxiliary contacts indicating the position of the switch and installed inside the operating mechanism.
◆ Remote Control and Telemetry Unit
MR-SafeRing-12/24 series switch cabinet. It can be equipped with integrated remote control monitoring unit. This pre-installed product can be assembled in the factory.
◆ Live display
A capacitive voltage indicating device is provided on the inlet and outlet bushing of the switching unit. Each live display itself also has three-phase voltage core phase extraction point, which can be used for nuclear phase configuration.
◆ Short Circuit/Grounding Fault Indicator
In order to find faults easily, the switch unit can be equipped with short-circuit/grounding fault indicator
◆ Cable connection
MR-SafeRing-12/24 series switch cabinets are equipped with DIN 47636 standard bushing. Cable compartment door and grounding switch are interlocked. Different switching units can be selected according to the number of outgoing circuits.
◆ Pressure Indicator
MR-SafeRing-12/24 series switchgear are equipped with SF6 gas pressure gauge
◆ Key lock
MR-SafeRing-12/24 series switchgear can be configured with key locks for load switches and grounding switches.
◆ Padlock
MR-SafeRing-12/24 series switchgear can be configured with padlocks to prevent non-staff operation.
◆ Secondary Line Chamber/Instrument Box
MR-SafeRing-12/24 series switch cabinet can be equipped with secondary chamber/instrument box for installation of secondary accessories and instruments.
◆ Lightning arrester
Configurable T-shaped silicone rubber plug metal zinc oxide arrester for MR-SafeRing-12/24 series switchgear.
Continuous operating voltage 13.6kV
U1mA.DC Reference Voltage (>25kV)
0.75U1mA.DC Leakage Current < 50μA
◆ Separable connector
T-shaped front plug and rear plug, PT elbow plug, complete the cable connection at the same time can install plug-in metal zinc oxide arrester Pi-shaped plug.
◆ Circuit breaker
MR-SafeRing-12/24 series switch cabinets can be equipped with core-piercing current transformers for metering/measurement as required.
Secondary output 5A
Precision 0.2 or 0.5
Circuit breaker unit adopts built-in CT:
epoxy resin casting
Moisture-proof design of secondary lead-out line
Bushing installation
Program description