CDMNS1 Low-voltage Draw-out Type Electrical Switch Cabinet

CDMNS1 low-voltage draw-out type switch cabinet (hereafter referred to “switchgear”) is developed by DELIXI, which is based on the MNS low-voltage switchgear series produced by Swiss ABB. The switchgear is composed of standardized, serialized modules. The drawers are equipped with reliable mechanical interlock devices, to ensure the safety and reliability during operation.The switchgear is suitable for three-phase five-wire power supply system with a frequency of 50(60)Hz, rated voltage of 380(400)V, rated insulation voltage 660V, rated current of 5000A. It can be used for power plants, power substations, industrial & mining enterprises, buildings, airports, wharf and radio & television centers, to control the power generation, power distribution, electricity transformation and power consumption. In addition, it can offer reactive power compensation for the main busbar by capacitance compensation

Cabinet switch is developed by DELIXI, which is based on the MNS low-voltage switchgear series produced by Swiss ABB. The electrical switch cabinet is composed of standardized, serialized modules. The drawers are equipped with reliable mechanical interlock devices, to ensure the safety and reliability during operation.The switchgear is suitable for three-phase five-wire power supply system with a frequency of 50(60)Hz, rated voltage of 380(400)V, rated insulation voltage 660V, rated current of 5000A. It can be used for power plants, power substations, industrial & mining enterprises, buildings, airports, wharf and radio & television centers, to control the power generation, power distribution, electricity transformation and power consumption. In addition, it can offer reactive power compensation for the main busbar by capacitance compensation.

2. Advanced new features

2.1 Changing the blind hinges of upper ventilating door, cable-chamber door and back door into back-flap hinges makes the doors turn more stable with a larger rotation angle. Besides, it improves the whole appearance.

2.2 Before improvement, the primary transition component is connected with plastic functional component.If accident occurs, the primary transition component is easily burning out, which results in difficult maintenance and long component replacement. After improvement, the primary is installed independently, thus reduce the power service interruption time.

2.3 Primary cable outgoing of the MCC cabinets is more flexible than before. Cables go out through both side and back, while only side or back in the before.

2.4 Primary cables in 8E, 16E, and 24E drawer units can be specified according to actual currents in loops. It is convenient for local repair or alteration.

2.5 After improvement, central post is optimized to increase space for cables outgoing, to make it easy for maintenance and operation, and also retain features of DELIXI products.

2.6 After improvement,in the scheme of cables go out from back door, secondary connectors are moved from side to the back partition boards, which shortens the distance between secondary cables to the terminal, and also eliminates the troubles that inspection and repair cannot be done since the switchgears stand close together. (It happens easily in the scheme that cables go out through back door when the switchgear has a width of 600mm)

3. Working environment

3.1 Ambient air temperature ranges from +40°C to -5°C . Average temperature within 24h doesn’t exceed +35 °C .

3.2 Relative humidity of ambient air doesn’t exceed 50% at +40°C . Higher humidity is permissible for lower temperature, for example 90% at +20°C . However, occasional condensation may happen due to temperature change.

3.3 If the switchgear is used indoor, the elevation above sea level should not exceed 2000m.

3.4 The switchgear shall be installed at a place free of fierce vibration and impact, and without corrosion to electric elements.

Main structure for looped network cabinet

Standard and specification	GB7251.1-2005 Low-voltage complete-set switching equipment and control equipment (TTA)
	JB/T9661-1999 Low-voltage draw-out type switching equipment
Over-voltage class	Ⅳ Ⅲ
Pollution class	3
Rated working voltage(Ue)(V)	380(660)
Rated insulation voltage(Ui)(V)	660(1000)
Rated frequency(Hz)	50(60)
Horizontal busbar
Rated current	5000 A4000 A3150A  2500A 2000A 630A
Rated short-duration withstanding current (lcw)(kA)	50-65~80(is effective value)
Rated peak withstanding current(lpk)(kA)	105,140,176.(0.1s max. value)
Vertical busbar
Rated max. working current	<1000A
Rated short-duration withstanding current	50kA
Rated peak withstanding current	105kA
Shell protection class	IP30 IP40(Special instructions)

4. Structural Feature

The switchgear introduces advanced technology from Swiss ABB. Based on the original structure it is improved according to the national standard. The cabinets use 25mm module of C type steel to compose various cabinet structures and drawer units. In the MCC cabinets, high strength flame-retardant engineering plastic components are used to make it more reliable. Meanwhile, improved imported functional plate is shaped in 200mm module, it makes more convenient for combining PC cabinet and MCC cabinet. The drawer units and switchgear are equipped with reliable interlock device, preventing switching off with load when power is on, thus enhance safety. Besides, the switchgear employs passivating cold rolled steel plates, or employs aluminum-zinc plates when required by customers.

5. Type of switchgears

5.1 Incoming and busbar connection switchgear

5.2 Power center switchgear (PC): Adopt domestic or foreign frame-type circuit breakers, such as CDW7, CDM7 (produced by DELIXI), MT, and E-series circuit breakers to distribute power.

5.3 Motor control center switchgear (MCC): MCC switchgear is composed of small or large drawers. Main switch of each circuit uses MCCB with high breaking capacity or rotary load switch wit fuse.

5.4 Reactive power compensation switchgear

6. Type of drawer units

All the five kinds of drawer units are designed in modular structure with a height of 8E (200mm). The installation height of effective components is 1800mm. The whole switchgear is arranged more reasonable and elegant.

8E/4: 4 drawer units in parallel at 8E height.

8E/2: 2 drawer units in parallel at 8E height.

8E: 1 drawer unit in 8E height

16E: 1 drawer unit at 16E height (400mm).

24E: 1 drawer unit at 24E height (600mm)

Switchgear can adopt one or more of the above drawer units (See Figure 1).

Arrangement Mode	8E/4	8E/2	8E	16E	24E
Max. Number of Units	36	18	9	4+8E	3

Switchgear arrangement

Single-panel operation or double-panel operation MCC switchgear can be composed according to actual demand. Switchgear is divided into three chambers: main busbar chamber, electric appliance chamber and cable chamber.

(See Figure 2 for more details)

Safety protection system

The switchgear has an anti-flaming high-density polyurethane functional plastic board, or electroplate installed between main busbar chamber and electric applicace chamber. In order to take out safety operation, this method effectively prevents flashover occurred by switch or accident caused by main busbar short circuit.

Upper and lower drawers are separated by galvanized plates with ventilating holes. Smaller 8E/4 and 8E/2 drawers have anti-fire engineering plastic parts to form strong insulation.

The switchgear adopts many kinds of plastic parts to support electrified parts. Such plastic parts shall be free of halogen and prevent current leakage with CT1300 grade.

Independent PE grounding system and N neutral conductor are provided inside the switchgear. Both of them go through the whole switchgear, and are installed at the bottom or right side of the front switchgear. Loops can be connected to neutral or grounded in the shortest way. Installation of the whole busbar system is shown in Figure 3. Self-tapping screws are employed for frame structures to ensure reliable grounding. (See Figure 3 for more details)

Busbar system

Switchgear can have two groups of main busbars in the busbar chamber. The two groups of main busbars may be respectively installed at the upper and lower plates of the chamber. The two groups of main busbars may adopt materials with same or different cross section area. They can supply power independently or in parallel to be used as back-up supply power.

Power-distributing busbar(vertical busbar) is built in the anti-flaming plastic functional boards, to prevent arc discharge and human contact. The busbar is connected to the main busbar by means of special connecting parts.

The electric and mechanical interlock of drawer

Drawer units are provided with reliable mechanical interlock. By controlling with the operation handle, there are obvious site for preparing, closing, testing, extracting and isolating.

For the sake of safety, the operating handles, once being positioned, should be locked. Three locks may be used at the utmost.

Electrical components selection

Electrical devices are chosen from advanced technology or mass-produced imported products.

1. Main circuit with 630A or above incoming or feeding loop, mainly choose the CDW7 series, cdw1 series, AE series, CW1 series or RMW1 also can be the choice. The imported MT series, E series or IZM series is acceptable if necessary.

2. Circuit breaker with 630A feeding or motor control, mainly choose the CDW7 series, cdw1 series, CW1 series, TM30 series or RMW1 also can be the choice. The imported NS(NSX) series or S(T)series is acceptable if necessary.

3. AC contractors are mainly supplied with CDC7 series, LC1 series or 3TB series, as well as matched thermal relay and interlock mechanism.

4. Current transformer is selected from ALH, BH and SDH series.

5. Fuse is selected from Q or NTOO series with breaking ability.

The following are some parameters of DELIXI electric components.

CDW7 series of general type circuit breaker

CDW1 series of general type circuit breaker

Main technical parameters

Overall dimensions of CDW1-2000-3200A fixed type circuit breaker

Overall dimensions of CDW1-2000-3200A fixed type circuit breaker

CDM7 series of moulded case circuit breaker (MCCB)

Main technical parameters

CDM1 series of moulded case circuit breaker (MCCB)

Main technical parameters

Overall dimensions

CDC7 AC Contactor

Main technical parameters

Overall Dimensions

Primary scheme diagrams

CDMNS1 switchgear installation diagram

Installation for current-incoming switchgear and interconnecting switchgear

Installation of PC switchgear

Installation of MCC switchgear

Order information

1. Customer shall provide main connection scheme diagram, serial number, application, rated voltage, rated current, power

distribution room layout and switchgear arrangement, indicate each number of circuit module.

2. Indicate specifications of incoming and outgoing cables.

3. Models, specifications and quantities of main electric components inside the switchgear.

4. If busbar bridge or busbar duct is needed to link switchgear or cable incoming cabinets, rated carrying capacity, span, and

height above ground of busbar bridge or busbar duct shall be provided. For more details, see instructions about ordering

busbar bridge and busbar duct.

5. If the switchgeart is used in special conditions, indicate the conditions.

6. Color: ice-like grey/7H507

7. It is suggested to adopt fixed installation if the current through unit loop is greater than 400A.

8. Other requirements