Product overview
HXGN15-12 box type Pxed metal enclosed ring main unit (ring main unit for short) is suitable for power system of AC 50Hz, 12kV. It’s widely used in industrial and civil cable ring network and power supply terminal.
Especially suitable for small secondary substations, switching stations, urban residential distribution, industrial and mining enterprises, shopping malls, airports, subways, wind power generation, hospitals, stadiums, railways and other places.
Model and meaning
Service condition
● Altitude: ≤1000m (special requirements can be noted when ordering, currently there are 6 groups operating at an altitude of 5200m).
● Ambient temperature: -35℃ ~ +45℃, maximum daily average temperature difference ≤ 25° C.
● The average daily relative humidity shall not exceed 95%, and the average monthly relative humidity shall not exceed 90%.
● Seismic capacity: 8 degrees.
● In place of no severe vibration and impact and no fire, chemical corrosion or explosion hazard.
Executive standard
● GB3906-2006 Alternating-current metal-enclosed switchgear and controlgear for rated voltage above 3.6kV and up to and including 40.5kV
● IEC 60298-1990 A.C. metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV
● GB/T 11022-2011 Common specification for high-voltage switchgear and controlgear standards
Product feature
● Beautiful and compact appearance, the protection level of the shell is more than IP3X after the assembly of the cabinet.
● The upper and lower units are modular and easy to install and maintain.
● The cabinet rack adopts riveted structure to ensure the strength of the cabinet.
● Integrated low voltage room for mounting secondary components and an expandable meter room for mounting more secondary protection units.
● Pressure relief channels for installation are available.
● It adopts SF6 gas insulated maintenance-free load switch, with good economical efficiency and reliability.
● Easy to operate.
● With a complete five-prevention interlock device, high installation performance.
Product structure
● The overall structure
The ring Main Unit is composed of bus room, load switch (or circuit breaker room), cable room, operating machinery, interlocking mechanism and low-voltage control room, as well as measurement or metering circuits. Each compartment is separated by steel plates to avoid failure to the adjacent room.
● Bus room
The bus room is arranged on the upper part of the switchgear, where the main buss are connected together and run through the entire row of switchgear. The buss are arranged horizontally and can be easily expanded.
● Main switch room
a.Load switch room: There is a load switch in the switch room. The shell of the load switch is made of epoxy resin, filled with SF6 gas as the arc extinguishing and insulating medium. At the leading end of the operating shaft, there are two transparent hot-pressed molded plastic end cap, through which the state of the contact can be observed. SF6 gas density meter or gas density meter with alarm contact can be installed in the switch room according to customer requirements
b.Circuit breaker room: The circuit breaker room is located in the middle of the switchgear, which can be equipped with special vacuum circuit breakers or SF6 circuit breakers according to customer needs. Its breaking capacity can meet the normal switching and branch network operations and breaking electric current of short circuits etc. under special circumstances. Vacuum circuit breakers are particularly suitable for frequent network systems. The circuit breaker is equipped with a spring operating mechanism with reclosing function, reliable action and long life.
● Cable room
The cable compartment is mainly used for the connection of cables, so that single-core or three-core cables can be connected with the simplest unshielded cable lugs. At the same time, there is ample space to accommodate lightning arresters, current transformers, and lower grounding switches. According to the standard design, the switchgear door has an observation window and a safety interlocking device, and the bottom plate of the cable room is equipped with a sealing cover and a cable clamp with a bracket of a suitable size. The front door frame of the bottom plate of the cable room can be removed to facilitate cable installation.
● Operating mechanism, interlocking mechanism and low-voltage control room
The low-voltage chamber with interlock also functions as a control panel. The low-voltage room is equipped with a spring operating mechanism with a position indicator and a mechanical interlocking device. It can also be equipped with auxiliary contacts, trip coils, emergency trip mechanisms, capacitive live display devices, key locks and electric operating devices. At the same time, the low-voltage room space can also be used to install control circuits, recording instruments and protection relays. The 750mm wide switchgear is equipped with two identical low-voltage rooms, which can be equipped with more accessories.
Technical parameter
| No. | Item | Unit | Value |
|---|---|---|---|
| 1 | Rated voltage | kV | 12 |
| 2 | Rated frequency | Hz | 50 |
| 3 | Rated current of main bus/max. rated current of fuse | A | 630, 125 |
| 4 | Rated short time withstand current of main circuit and ground circuit | kA/S | 20, 3 |
| 5 | Rated peak withstand current of main circuit and ground circuit | kA | 50 |
| 6 | Rated short circuit making current of main circuit and ground circuit | kA | 50 |
| 7 | Load switch full capacity breaking time | times | 100 |
| 8 | Breaking current of fuse | kA | 31.5, 40 |
| 9 | Rated closed-ring breaking current | A | 630 |
| 10 | Rated transfer current | A | 1600 |
| 11 | Mechanical life | times | 2000 |
| 12 | 1min power frequency withstand voltage (peak) phase-phase, phase-earth/isolating distance | kV | 42, 48 |
| 13 | Lightning impulse withstand voltage (peak) phase-phase, phase-earth/isolating distance | kV | 75, 85 |
| 14 | 1min power frequency withstand voltage of secondary circuit | kV | 2 |
| 15 | Protection level | IP3X |
Outline size
| Size | Applicable range | |
|---|---|---|
| Height H(mm) | 1400 | Applicable for single-core cable |
| 1600 | Applicable for single-core cable | |
| 1800 | Applicable for three-core cable | |
| Width W(mm) | 375 | Inlet and outlet |
| 500 | ||
| 750 | ||
| Depth D(mm) | 918 |
Structure diagram
Ordering instruction
Please specify when ordering:
● The following technical data should be provided when ordering:
● Main wiring solution number, purpose and single-line system drawing, rated voltage, rated current, rated short-circuit breaking current, distribution room layout drawing and switch cabinet arrangement drawing, etc.;
● Requirements for the control, measurement and protection functions of the switchgear, as well as requirements and schematics for other locking and automatic devices;
● Model, specification and quantity of the main electrical components in the switchgear;
● When the switchgear is used in special environmental conditions, it should be specified when ordering;
● Other special requirements must be explained and negotiated in detail in writing before ordering.
