DRM-12 SF6 Gas Insulated Switchgear
Model and meaning
Product description
DRM-12 Fully insulated and fully enclosed main ring unit switchgear (standardized) independently developed by our company has been listed as a high-tech product of Zhejiang Province by China’s National High-Voltage Electrical Apparatus Testing Center in type test and Zhejiang Province High-Tech Technology Project. it is widely used in 10kv/6kv power distribution systems and is preferred by various urban and rural users of power distribution systems.
The switchgear is modular and can be combined for various purposes; it consists of two categories: non-expandable unit combination and expandable unit combination, to meet the needs of various power substations in flexible applications of compact switchgears.
DRM-12 fully insulated and fully enclosed main ring unit switchgear (standardized) is a completely sealed system, with all live parts and switches enclosed in a stainless steel shell. The whole switchgear isn’t influenced by external environmental conditions to guarantee reliable operation and personal safety and is free from maintenance, By an expandable bus, any combination is available and fully modular. The expandable bus is insulated and shielded safely to guarantee high reliability and safety, DRM-12 inflatable switchgear can also provide TV-based automation solutions with a concept of intelligent switchgear and minimize the work of on-site installation and commissioning.
DRM-12 Fully insulated and fully enclosed main ring unit switchgear (standardized) has non-expandable standard configuration and expandable standard configuration. Owing to its fully-modular and half-modular combination and expandability it is especially flexible.
DRM-12 fully insulated and fully enclosed main ring unit switchgear (standardized) conforms to GB standards. Its design life is over 30 years in indoor conditions (20° C).
Performance index
SF6 gas pressure Absolute pressure 0.04Mpa at 20°C
Annual gas leak rate 0.05%
Ingress protection IP67
Stainless steel thickness of gas chamber 3.0mm
Bus
Bus in switchgear 400mm²Cu
Switchgear grounding bus 150mm²Cu
Color
Switchgear front panel RAL7012
Side panel and cable chamber front cover RAL7035
Normal work conditions
Maximum temperature +40°C
Minimum temperature -40°C
Maximum average relative humidity ≤95%
Altitude ≤2000 m
Compliant with standard
IEC60056 IEC60129 IEC60265
IEC60298 IEC60420 IEC60694
Main Features
The fully insulated and fully enclosed (standardized) main ring unit metal switchgear adopts SF6 gas as arc extinguishing and insulating medium.
◆Reliable operation
The switchgear is fully enclosed and fully insulated, the bus, switches and live parts are completely enclosed in its stainless steel shell. The cavity is filed with SF6 gas at 0.04Mpa, and its ingress protection is IP67. The whole switchgear is not influenced by external environmental conditions, even in special conditions such as short-time water immersion, its normal operation is guaranteed and it is free from maintenance for its whole life.
◆Operation safety
The switchgear is equipped with a perfect five-protection interlocking to prevent any personnel injury or fault due to any error in operation. All switchgears are equipped with reliable pressure relief channels to guarantee operators personal safety in special conditions.
◆Flexible configuration
The switchgears are divided into two types: non-expandable combination and expandable combination, with cabling from the front or cabling from the side or expanded from the side according to various installation positions, The cabinet is easy to install, is ideal for a small space or an area with unfavorable environmental conditions. The switchgear can be equipped with electric actuator,remote control and monitoring device according to various users needs.
◆Widely applicable
With great feeder capacity and a small area occupied for various applications.
Design description
◆Technical description
DRM-12 fully insulated and fully enclosed main ring unit switchgear (standardized) is installed on a galvanized sheet frame with switchgear inside an SF6 gas tank made of corrosion-proof and non-magnetic 3mm-thick stainless steel sheet.
The SF6 gas tank is a "sealed pressure system” that can run for 20 years in normal work conditions.The SF6 gas normal operation pressure is 0.03-0.25Mpa.
The gas tank is equipped with a pressure relief device o guarantee that the gas can be relieved from the bottom or the back when the pressure is too high.
◆Switchgear
The load switch with coaxial rotating double-breakpoint method is operated in a same operation hole and a same slide plate to carry out kinetic operation,so it can only be in one of the three states of “closing, breaking, grounding” at any time to prevent any error in operation.
◆Actuator
The switch actuator is installed in the front of the gas tank and is treated by special technique to be corrosion-proof, easy to operate and maintain manually or actuate electrically.
Main technical parameters
|
Name |
Module C |
Module F |
Module V |
Module CB |
|||
|
Compound switch |
Appliance combination |
Vacuum switch |
Insulation/grounding switch |
Vacuum switch |
Insulation/grounding switch |
||
|
Rated voltage |
kV |
12 |
12 |
12 |
12 |
12 |
12 |
|
Rated frequency |
Hz |
50/60 |
50/60 |
50/60 |
50/60 |
50/60 |
50/60 |
Main technical parameters
|
Name |
Module C |
Module F |
Module V |
Module CB |
|||
|
Compound switch |
Appliance combination |
Vacuum switch |
Insulation/grounding switch |
Vacuum switch |
Insulation/grounding switch |
||
|
Power frequency withstand voltage (phase-to-phase/disconnection) |
kV |
42/48 |
42/48 |
42/48 |
42/48 |
42/48 |
42/48 |
|
Lightning impulse withstand voltage |
kV |
75/85 |
75/85 |
75/85 |
75/85 |
75/85 |
75/85 |
|
Rated current |
A |
630 |
Note |
630/1250 |
630/1250 |
630/1250 |
630/1250 |
|
Rated closed- loop breaking current |
A |
630 |
|
|
|
|
|
|
Rated cable charging breaking current |
A |
10 |
|
|
|
|
|
|
Rated short-circuit closing current(peak) |
A |
50 |
|
|
|
|
|
|
Rated peak withstand current |
kA |
50 |
80 |
|
|
|
|
|
Rated instantaneous withstand current |
kA/3s |
20 |
|
|
|
|
|
|
Rated short- circuit breaking current |
kA |
|
31.5 |
20/25 |
|
20/25 |
|
|
Rated transfer current |
A |
|
1750 |
|
|
|
|
|
Maximum fuse current |
A |
|
125 |
|
|
|
|
|
Circuit resistance |
-n |
≤200 |
≤400 |
|
|
|
|
|
Mechanical life |
Time |
5000 |
3000 |
5000 |
5000 |
5000 |
5000 |
(Note:1)subject to rated current of fuse.
Unit definition
|
Unit code |
Meaning |
|
C |
Standard single-bushing load switch unit |
|
F |
Load switch-fuse appliance combination unit |
|
V |
Circuit breaker unit |
|
D |
Cable feeder unit(without switch) |
|
+ |
Bus side bushing |
|
- |
Bus top bushing |
|
SL |
Bus coupler unit |
|
M |
Metering unit |
|
PT |
PT unit |
|
1K2(4) |
Load switch unit with double-bushing outlets |
Various non-expansion standard combination unit cabinets
Non-expansion standard module
The following fifteen standard combinations are available
Each module of DRM-12 switchgear has following configurations
Cabinet D-Lifting module
See standard configuration and features in “Cable connecting module without grounding knife” in page 011.
Cabinet C-Load switch module
See standard configuration and features in “Load switch module” in page 009.
Cabinet F-Load switch fuse appliance combination module
See standard configuration and features in “Load switch fuse appliance combination module” in page 012.
Cabinet V-Vacuum switch module
See standard configuration and features in“Vacuum switch module” in page 013.
Each module of DRM-12 switchgear has following configuration
◆Capacitive voltage indicator of inlet bushing
◆Pressure gauge for monitoring SF6 density in each gas chamber
◆Lifting lugs
◆Handle
Optional
◆Electric actuator
◆Cable short-circuit and ground-fault indicator
◆Current transformer and meter
◆Remote monitoring and interface
C Expansion module -Cable connecting module with grounding knife De
Standard configuration and features
◆630A bus
◆Three-position load/grounding switch
◆Three-position single-spring actuator with two independent load switches and grounding switch shaft
◆Load switch and grounding switch position indication
◆Horizontal 400 series of bolted bushing of outlet bushing 630A in front
◆Capacitive voltage indicator for live bushing
◆Padlock for all switch functions on panel
◆SF6 gas pressure gauge (only one per SF6 gas tank)
◆Grounding bus
◆Interlocking of grounding switch and cable room front panel
Optional configuration and features
◆Reserved bus extension
◆External bus
◆Electric actuator of load switch 24V/48V DC, 110V/220V DC/AC
◆Short-circuit and ground-fault indicator
◆Measuring loop current transformer and ammeter
◆Metering loop current transformer and kilowatt-hour meter
◆Zinc oxide lightning arrester or double-cable junction are available at cable inlet bushing
◆Key interlocking
◆Inlet live grounding block (block grounding switch when bushing is live) 110V/220V AC/DC
◆Auxiliary contact
◇Load switch position 2NO+2NC
◇Grounding switch position 2NO+2NC
◇Pressure gauge with signal 1NO
◇Arc extinguisher with signal contact 1NO
◆Secondary device can be installed in
◇Secondary line chamber on top of switchgear
◇Low-voltage box on top of switchgear
Expansion module - Cable connecting module with grounding knife De
Standard configuration and features
◆630A bus
◆Grounding switch
◆Two-position single-spring actuator
◆Grounding switch position indication
◆Horizontal outlet bushing in front
◆400 series of bolted bushing of 630A
◆Capacitive voltage indicator of live bushing
◆Padlock for all switch functions on panel
◆SF6 gas pressure gauge (only one per SF6 gas tank)
◆Grounding bus
◆Interlocking of grounding switch and cable room front panel.
Optional configuration and features
◆Reserved bus extension
◆External bus
◆Short-circuit and ground-fault indicator
◆Measuring loop current transformer and ammeter
◆Metering loop current transformer and kilowatt-hour meter
◆Zinc oxide lightning arrester or double-cable junction key interlock is available at cable inlet bushing
◆Inlet live grounding block (block grounding switch when bushing is live) 110V/220V AC/DC
◆Auxiliary contact
◇Grounding switch position 2NO+2NC
◇Pressure gauge with signal 1NO
◇Arc extinguisher with signal contact 1NO
◆Secondary device can be installed in
◇Secondary line chamber on top of switchgear
◇Low-voltage box on top of switchgear
Expansion module -Cable connecting module without grounding knife D
Standard configuration and features
◆630A bus
◆Horizontal outlet bushing in front
400 series of bolted bushing of 630A
◆Capacitive voltage indicator of live bushing
◆SF6 gas pressure gauge (only one per SF6 gas tank)
◆Grounding bus
Optional configuration and features
◆Reserved bus extension
◆External bus
◆Short-circuit and ground-fault indicator
◆Measuring loop current transformer and ammeter
◆Metering loop current transformer and kilowatt-hour meter
◆Zinc oxide lightning arrester or double-cable junction are available at cable inlet bushing
◆Secondary device can be installed in
◇Secondary line chamber on top of switchgear
◇Low-voltage box on top of switchgear
Expandable module - Load switch fuse appliance combination module F
Standard configuration and features
◆630A bus
◆Three-position load switch with mechanical link between fuse head and fuse end grounding switch
◆Three-position double-spring actuator with two independent load switch and grounding switch shafts
◆Load switch and grounding switch position indication
◆Fuse cartridge
◆Horizontal fuse
◆Fuse trip indication
◆Horizontal outlet bushing in front, 200 series of plug-in bushing of 200A
◆Capacitive voltage indicator of live bushing
◆Padlock for all switch functions on panel
◆SF6 gas pressure gauge (only one per SF6 gas tank)
◆Grounding bus
◆Fuse parameters for transformer protection
◇12kV, max 125A fuse
◆Interlocking of grounding switch and cable chamber front panel
Optional configuration and features
◆Reserved bus extension
◆External bus
◆Load switch actuating motor 24V/48VDC,110V.220V DC/AC
◆Parallel tripping coil 24V/48V DC, 110V/220V DC/AC
◆Parallel closing coil 24V/48V DC,110V/220V DC/AC
◆Measuring loop current transformer and ammeter
◆Metering loop current transformer and kilowatt-hour meter
◆Inlet live grounding block (block grounding switch when bushing is live) 110V/220V AC/DC
◆Auxiliary contact
◇Load switch position 2NO+2NC
◇Grounding switch position 2NO+2NC
◇Fuse breaking 1NO
◇Pressure gauge with signal 1NO
◇Arc extinguisher with signal contact 1NO
◆Secondary device can be installed in
◇Secondary line chamber on top of switchgear
◇Low-voltage box on top of switchgear
Expandable module -Vacuum switch module V
Standard configuration and features
◆630A bus
◆Vacuum switch for 630A transformer/line protection
◆Two-position spring actuator of vacuum switch
◆Three-position insulation/grounding switch below vacuum switch
◆Three-position insulation/grounding switch single-spring actuator
◆Mechanical interlocking of vacuum switch and three-position switch
◆Vacuum switch and three-position switch position indication
◆Electronic protection relay
◆Tripping coil (for relay action)
◆Horizontal outlet bushing in front, 400 series of bolted bushing of 630A
◆Capacitive voltage indicator of live bushing
◆Padlock for all switch functions on panel
◆SF6 gas pressure gauge (only one per SF6 gas tank)
◆Grounding bus
◆Interlocking of grounding switch and cable chamber front panel
Optional configuration and features
◆Reserved bus extension
◆External bus
◆Vacuum switch actuating motor 24V/48V DC,110V/220V DC/AC
◆Parallel tripping coil 24V/48V DC, 110V/220V DC/AC
◆Parallel closing coil 24V/48V DC,110V/220V DC/AC
◆Measuring loop current transformer and ammeter
◆Metering loop current transformer and kilowatt-hour meter
◆Key interlocking
◆Inlet live grounding block (block grounding switch when bushing is live) 110V/220V AC/DC
◆Auxiliary contact
◇Vacuum switch position 2NO+2NC
◇Insulation switch position 2NO+ 2NC
◇Ground switch position 2NO+2NC
◇Vacuum switch trip signal 1NO
◇Pressure gauge with signal 1NO
◇Arc extinguisher with signal contact 1NO
◆Secondary device can be installed in
◇Secondary line chamber on top of switchgear
◇Low-voltage box on top of switchgear
◆Other relays
Expandable module -Bus grounding module Be
Standard configuration and features
◆630A bus
◆Grounding switch
◆Two-position single-spring actuator
◆Grounding switch position indication
◆Padlock for all switch functions on panel
◆SF6 gas pressure gauge (only one per SF6 gas tank)
◆Grounding bus
Optional configuration and features
◆Reserved bus extension
◆External bus
◆Key interlocking
◆Auxiliary contact
◇Grounding switch position 2NO+2NC
◇Pressure gauge with signal 1NO
◆Secondary device can be installed in
◇Secondary line chamber on top of switchgear
◇Low-voltage box on top of switchgear
Expandable module -Metering module M
Standard configuration and features
◆2 current transformers
◆2 voltage transformers
◆6 x 400 series of bushings for DRM-12 inflatable external bus connection, top inlet and top outlet
◆Fuse for PT protection
◆Low-voltage part
◇1 voltmeter with transfer switch
◇1 ammeter with transfer switch
◇W*H*D=696*1806*820mm
Optional configuration and features
◆3 current transformers
◆3 voltage transformers
◆Zinc oxide arrester
◆Capacitive voltage indicator of live switchgear
◆Low-voltage part
◇1 active kilowatt-hour meter
◇1 reactive kilowatt-hour meter
Expandable module -PT module P
Standard configuration and features
◆2 voltage transformers
◆Fuse for PT protection
◆1 voltmeter with transfer switch
◆Top inlet and top outlet 3 x (6 x) 400 series of bushing for external bus connection of switchgear.
W*H*D=696*1806*820mm
◆Bottom cable inlet and bottom cable outlet
W*H*D=696*1460*820mm
Optional configuration and features
◆Zinc oxide arrester
◆Capacitive voltage indicator of live switchgear
◆24VDC charger and storage battery
◆Insulation switch
Expandable module -Vacuum tube circuit breaker module CB
Standard configuration and features
◆1250A/630A bus
◆Vacuum circuit breaker for 1250A/630A line protection
◆Vacuum circuit breaker VD4(VS1) electric actuation 110/220V DC/AC
◆Electric actuation of three-position insulation/grounding switch above vacuum circuit breaker
◆Protection and control unit (with CT protection)
◆Shunt trip coil 110V/220V DC/AC
◆Closing coil 110V/220V DC/AC
◆Horizontal outlet bushing in front
◆1250A/630A series of bolted bushing
◆Capacitive voltage indicator of live bushing
◆1250A/630A reserved bus extension
◆SF6 gas pressure gauge (only one per SF6 gas tank)
◆W*H*D=690*1806*781mm
◆Closing/tripping sequence: 0-0.3S-C0-180s-CO
◆Gas pressure sensor
Optional configuration and features
◆Zinc oxide arrester at inlet cable
◆Current sensor
◆Voltage sensor
Remote control and monitoring unit
Equipped with integrated remote control ,telemetry and telecommunication automation modules, DRM-12 fully insulated and fully enclosed (standardized) main ring unit switchgear realizes intelligent application of main ring unit switchgear. By telecommunication, it connects each unit with a deployment center at a higher level to realize comprehensive automation of a power distribution system. The automatic power distribution system network enables a deployment operator to understand the whole power distribution system network status in office, locate any fault quickly, automatically or manually realize fault insulation and network reconstruction,to control power failure within a smaller area and a shorter period with less loss, In addition it's convenient to monitor or deploy any load, which is beneficial to rational utilization of this network.
The switchgear is equipped with a network distribution automation system. This system has an open design and includes two parts: substation and automation terminal module. The automation terminal has a distribution modular design with high reliability,.Meanwhile, it is compact and can be installed in any compact switchgear.
Standard configuration and features
◆16 switch inputs (single telemetry),insulation voltage 1500VDC
◆8 analogy inputs (telemetry),including 4 current (AC5A)
◆4 voltage(1*24VDC,3*100VDC/220VAC)
◆6 switch outputs (remote control, available for up to 3 switches)
◆C-type dry contact,250V AC8A/30V DC8A
◆1RS485 communication port for remote communication up to 1200m
Function to choose
Calculation function of feeder P, Q,kwh, F, etc.
Current protection function applicable to switch output or communication output.
Transformer, line protection
DRM-12 fully insulated and fully enclosed main ring unit switchgear (standardized) provides two types of transformer protection: load switch fuse appliance combination and circuit breaker with relay protection.
Use of load switch fuse appliance combination module
The transformer protection is a combination of current-limiting high-voltage fuse and load switch.
The fuse chamber will be installed on the back of an independent latching enclosure shell in the front of the unit. The load switch has a spring-loaded energy storage mechanism to be triggered by fuse firing pin.
To make it easy to replace a fuse, can remove fuse chamber cover by handle. The fuse trip mechanism is in front to keep the whole system water-proof.
DRM-12 Product diagram
① SF6 gas pressure gauge
② Live indicator
③ Closing/breaking position indication
④ Grounding position indication
⑤ Load switch operation hole
⑥ Grounding switch operation hole
⑦ Switch position selection sliding plate
Fuse-transformer comparison table
|
100% |
Rated capacity of transformer (kVA) |
||||||||||||||||
|
UN(kV) |
25 |
50 |
75 |
100 |
125 |
160 |
200 |
250 |
315 |
400 |
500 |
630 |
800 |
1000 |
1250 |
1600 |
|
|
3 |
16 |
25 |
25 |
40 |
40 |
50 |
50 |
80 |
100 |
125 |
160 |
160 |
|
|
|
|
7.2kV |
|
33 |
16 |
25 |
25 |
40 |
40 |
50 |
50 |
63 |
80 |
100 |
125 |
160 |
|
|
|
|
|
|
4.15 |
10 |
16 |
25 |
25 |
40 |
40 |
50 |
50 |
63 |
80 |
100 |
125 |
160 |
|
|
|
|
|
5 |
10 |
16 |
25 |
25 |
25 |
40 |
40 |
50 |
50 |
63 |
80 |
100 |
125 |
160 |
|
|
|
|
55 |
6 |
16 |
16 |
25 |
25 |
25 |
40 |
50 |
50 |
63 |
80 |
100 |
125 |
160 |
|
|
|
|
6 |
6 |
16 |
16 |
25 |
25 |
25 |
40 |
40 |
50 |
50 |
80 |
100 |
125 |
160 |
160 |
|
|
|
6.6 |
6 |
16 |
16 |
25 |
25 |
25 |
40 |
40 |
50 |
50 |
63 |
80 |
100 |
125 |
160 |
|
|
|
10 |
6 |
6 |
10 |
16 |
16 |
25 |
25 |
25 |
40 |
40 |
50 |
50 |
80 |
80 |
125 |
125 |
12kV |
|
11 |
6 |
6 |
10 |
16 |
16 |
25 |
25 |
25 |
25 |
40 |
50 |
50 |
63 |
80 |
100 |
125 |
|
|
12 |
6 |
6 |
10 |
16 |
16 |
16 |
25 |
25 |
25 |
40 |
40 |
50 |
63 |
80 |
100 |
125 |
|
|
13.8 |
|
6 |
10 |
10 |
16 |
16 |
25 |
25 |
25 |
25 |
40 |
50 |
50 |
63 |
80 |
100 |
17.5kV |
|
15 |
6 |
6 |
10 |
10 |
16 |
16 |
16 |
25 |
25 |
25 |
40 |
40 |
50 |
63 |
80 |
100 |
|
|
17.5 |
6 |
6 |
|
10 |
10 |
16 |
16 |
16 |
25 |
25 |
25 |
40 |
50 |
50 |
63 |
80 |
|
|
20 |
6 |
6 |
6 |
10 |
10 |
16 |
16 |
16 |
25 |
25 |
25 |
40 |
40 |
50 |
63 |
63 |
24kV |
|
22 |
6 |
6 |
6 |
6 |
10 |
10 |
16 |
16 |
16 |
25 |
25 |
25 |
40 |
50 |
50 |
63 |
|
|
24 |
6 |
6 |
6 |
6 |
10 |
10 |
16 |
16 |
16 |
25 |
25 |
25 |
40 |
40 |
50 |
63 |
|
Accessories
A cable chamber as required
The cable connection room is large, and the sleeve is standard design to achieve coordination with all European standard cable plugs.
Under normal circumstances, each load switch unit can be connected to 1~3 return lines, and the special design type can be connected to 4~6 return lines.
The vacuum circuit breaker unit can be connected with 1 or 2 return cables.
Pressure relief device
The pressure relief device is separated from cable chamber by a metal plate, If the pressure in the gas tank is too high, the explosion-proof diaphragm in the device breaks to relieve the pressure.
Electric actuation
The manual actuator for cable switch unit and transformer unit is standard. An electric actuator is also available.
The cable switch, vacuum circuit breaker and grounding switch are operated by a mechanism behind front panel. All switches and circuit breakers can be operated by handle (standard configuration )or can be equipped with a motorized actuator (accessory). However, a grounding switch can only be operated manually and is equipped with a mechanism capable of breaking due to faulty current. It is easy for an electric actuator to realize.
Cable connection
The international standard universal specification bushing conforms to DIN47636 standard, so it is convenient for users to choose corresponding cable accessories. The T-shaped front or rear cable plug and European-style bolt step structure are adopted to connect and tighten. M16 bolt is used to connect a front plug with a bushing.
Interlocking mechanis
The interlocking mechanism inside a switch can effectively prevent any error in operation, and guarantee that a person only can enter the cable chamber when the switch is “grounded” , with a lock to lock it in any state.
Arrester connection
The load switch unit can be equipped with T-shaped rear-plug silicone rubber fully-sealed metal zinc oxide arrester.
When there are many cable circuits without sufficient space, π-shaped rear-plug arrester is available.
Auxiliary switch
The load switch and grounding switch can be equipped with an auxiliary switch to show the switch position synchronously as required.
Fuse
It' s easy to replace DRM-12 series of switch fuse,The fuse is in an insulation cartridge,which is in SF6 metal gas tank. This design has following advantages.
◆Fuse cover and sealing device are at the weakest part of the electric field
◆No conductive substance can attach to the fuse assembly
◆The part within SF6 gas is completely protected
◆Fuse cover does not require additional insulation
The spring energy storage actuator and linked tripping device guarantee that the 3-phase load switch trips automatically when the fuse of any phase breaks
Switch test
DRM-12 fully insulated and fully enclosed main ring unit switchgear (standardized) has been tested by Electrical Equipment Quality Inspection and Test Center of China’s Ministry of Electric Power Industry, and the products conform to following main standards: GB/T11022, IEC 60694. IEC 60265, IEC 60420.IEC 60056,IEC60298.IEC 60129.
Use conditions
DRM-12 fully insulated and fully enclosed main ring unit switchgear (standardized) is ideal to use at -40°C~+50°C.The 12kv live part is located in the SF6 sealed gas tank and the silicone rubber plug makes the cable connected with the switch to form a fully insulated and fully sealed structure: the whole system is not influenced by environmental factors, such as moisture, dust, corrosive gas, etc,the SF6 gas tank is made of stainless steel to make the switchgear free from maintenance with a long service life.
Surface protection
The frame of the main ring unit is made of galvanized sheet with electrostatic coting on the surface to prevent corrosion. The front panel of the cabinet has electrostatic coating.
Standard coating:
◆Screen RAL1003 (signal yellow) ◆Cable chamber door RAL7035(white) ◆Switch side plate RAL7035(white)
Vacuum circuit breaker unit
Special parallel cabinet bus
DRM-12 fully insulated and fully enclosed main ring unit switchgear (standardized) can be equipped with an external bus.
Voltage transformer
DRM-12 fully insulated and fully enclosed main ring unit switchgear (standardized) can be equipped with a 12kv fully enclosed voltage transformer as required to meet the needs of power distribution network automation.It can be used to provide for measuring/metering voltage signal. switch electric actuator power supply.
◆Can choose single/three-phase as required ◆ Variable ratio: 10/0.1/0.22kV ◆ Precision (AC100V): 0.2 or 0.5
DRM-12 Foundation channel steel schematic
DRM-12 Structure Schematic
1-Fuse chamber
2-Capacitive voltage indicator
3-Short circuit grounding fault indicator (attachment)
4-Pressure indicator
5-Standard with serial number
6-Analogy circuit diagram
7-Fuse breaking indicator
8-Padlock on panel
9-Cable chamber
10-RTU installation room
11-Interlocking(attachment)
12-Circuit breaker operation hole
13-Load switch operation hole
14-Grounding switch operation hole
15-Insulation switch operation hole
16-Breaking button
17-Closing button
DRM-12 fully insulated and fully enclosed (standardized) main ring unit metal switchgear dimensions
Standardized main ring unit metal switchgear dimensions-C
DRM-12 fully insulated and fully enclosed (standardized) main ring unit metal switchgear dimensions
Standardized main ring unit metal switchgear dimensions-F
Standardized main ring unit metal switchgear dimensions-V
