MNS low-voltage withdrawable switchgear

Overview of MNS low-voltage withdrawable switchgear:

This series of low-voltage pumped switchgear is a combination switchgear type assembled by factory (FBA) with standard modules.

This series of low-voltage pumped switchgear is suitable for power plants, substations, petrochemical, metallurgical steel rolling, transportation energy, light industry and textile and other factories and mining enterprises and residential areas,

High-rise buildings and other places, as AC 50~60HZ, rated working voltage AC 660V and below power system power system power conversion and control purposes. Widely used in 6KV/6.3KV/7.2KV/10KV/

12KV/22KV/24KV/33KV/35KV/40.5KV box-type transformer distribution switchgear, urban power grid transformation, residential areas, high-rise buildings,

Industrial and mining industries, hotels, shopping malls, airports, railways, oil fields, docks, highways, temporary electricity facilities and other indoor and outdoor places.

The device conforms to the national professional standards of G Ben B2751.1 "Low Voltage Complete Switchgear" and JB/T 9961 "Low Voltage Withdrawable Complete Set of Switchgear" and conforms to IEC 349-1 international professional standards.

Normal operating conditions of MNS low-voltage withdrawable switchgear:

◆The ambient air temperature is not higher than +40°C, not less than -5°C, and its average temperature is not higher than +35°C within 24h.

◆ Atmospheric conditions: clean air, relative humidity does not exceed 50% at high temperature +40°C, high relative humidity is allowed at lower temperature,

For example, it is 90% at +20°C, but considering temperature changes, condensation may occur accidentally.

◆The altitude does not exceed 2000m.

◆This device is suitable for the transportation and storage process of the following temperatures: between -25°C and +55°C, in a short time (not more than 24h) up to +70°C,

These limiting temperature devices should not be subjected to any irreversible damage and should function normally under normal conditions.

◆If the above conditions of use cannot be met, it should be resolved through negotiation between the user and the manufacturer.

◆When this device is used in offshore oil drilling platforms and nuclear power plants, a separate technical agreement should be signed.

Basic technical parameters of MNS low-voltage withdrawable switchgear:

1. Electrical performance

2. Protection level

Complies with IEC 5 29, DIN 4 0050

IP30 FIXED PROTECTION GREATER THAN Φ2.5MM

IP40 FIXED PROTECTION GREATER THAN Φ1.0MM

IP54 protects against dust and splashes in any direction

(When ordering IP54 protection, you should negotiate with the manufacturer)

MNS low-voltage withdrawable switchgear switchgear structure:

The basic structure of the switchgear switchgear is composed of C-shaped profile assembly. The C profile is made of steel plate bent with E=25mm as the module mounting hole.

All switchgear shelves and inner partitions are galvanized and phosphated. The surrounding door panels, the side panels are sprayed with high-voltage electrostatic plastic.

MNS low-voltage withdrawable switchgear switchgear type:

1. Power distribution center switchgear(PC): Emax, MT, 3WN, AH, ME series and other circuit breakers can be used.

2. Motor control center switchgear(MCC): assembled by large and small drawers, the main switch of each circuit adopts high break

Molded case circuit breakers or rotary load switches with fuses. Power factor automatic compensation switchgear (with manual, automatic and teledynamic power factor compensation device)

A power distribution center (PC) switchgear

B Motor Control Center (MCC) switchgear

switchgear frame structure composed of C-shaped profiles

Schematic diagram of the switchgear

Zoning design of MNS low-voltage withdrawable switchgear switchgear:

• Power Distribution Center (PC)

（1）. The PC switchgear is divided into three compartments;

Flat busbar compartment : water at the rear of the switchgear;

Energy unit compartment: the work is in the upper part of the front of the switchgear or the left side of the front of the switchgear;

(2). Segregation measures:

The flat busbar compartment and the water function unit compartment are separated by steel plates.

The circuit compartment and the control function unit compartment are separated by a flame-retardant polyphenylene ether plastic housing.

(3). The frame circuit breaker installed in the switchgear can realize manual operation outside the switchgear when the door is closed.

Observe the opening and closing state of the circuit breaker and according to the position relationship between the operating mechanism and the door, break out whether the circuit breaker is in the test position or the working position.

(4). The main circuit and the auxiliary circuit are designed as a separation structure, instrument,

The auxiliary electrical units composed of signal lamps and buttons are installed on plastic plates, and the shell made of flame-retardant polyammonia foam plastic is separated from the main circuit after the board.

• Extractive motor control center and low-current power distribution center (MCC)

Withdrawable type, C C drawer switchgear is divided into three compartments, that is, the horizontal busbar compartment behind the switchgear,

The functional unit compartment on the left side of the front of the switchgear, and the cable compartment on the right side of the front of the switchgear.

The horizontal busbar compartment and the energy unit power compartment are separated by functional plates made of flame-retardant foamed plastic.

The cable compartment is separated from the horizontal busbar compartment and the functional unit compartment by steel plates.

MCC (Electric M Machine Control Center) drawers are divided into the following 5 types:

• 8E/4: Height 200× width 150× depth 400mm

• 8E/2: Height 200× width 300× depth 400mm

• 8E: Height 200× width 600× depth 400mm

• 16E: Height 400× width 600× depth 400mm

• 24E: Height 600× width 600× depth 400mm

• Rear outlet switchgear structure

Designed to reduce the width of the switchgear arrangement, the switchgear's main busbar is installed horizontally on top of the switchgear,

The back half of the switchgear is the cable room, and the incoming and outgoing cables are connected in the cable room behind the switchgear. The front of the switchgear is a small installation chamber,

Install the functional unit of the switchgear. The system design moves the cable compartment on the side of the switchgear to the rear room of the switchgear.

The arrangement width of the switchgear is greatly reduced to further meet the requirements of the substation space layout.

The power feed switchgear switchgear is 600mm wide and 1000/1200mm deep, and the top is an independent main busbar room isolated from the device chamber.

The effective installation height of the front device chamber is 72E (E=25mm), which is isolated from the rear cable room by the multi-function board.

It makes full use of the installation space of the switchgear, and the structure is compact and the unit configuration is flexible. The cable room on the back has a door, which is easy to install and maintain.

The width of the inlet switchgear is determined by the rack current of the inlet unit, and the recommended width is 400/600/800/1000mm, and the switchgear depth is 1000mm.

Busbar system

The switchgear can be configured with two sets of main busbars, which are installed in the rear busbar room of the switchgear. Two sets of busbars can be installed behind the switchgear

Upper and lower. According to the needs of the incoming line, the upper and lower groups of busbars can use different or the same cross-section materials.

They can be powered separately, in parallel, or as a backup power supply.

The distribution bus (vertical busbar) is assembled in flame-retardant plastic functional boards and connected to the main bus by special connectors.

It can not only prevent the discharge caused by arcing, but also prevent human contact. The switchgear is equipped with an independent PE grounding system and N neutral conductor.

The two run through the entire device and are installed at the bottom and right side of the switchgear. Each circuit can be connected to ground or zero.

The entire busbar system installation is shown in Figure 3. The switchgear frame structural parts are all connected by self-tapping screws, which has high grounding reliability.

The neutral busbar and the neutral protection bus bar are installed parallel to the lower part of the compartment of the functional unit and vertically in the cable.

If the N line and the PE line are separated by insulators, the N line and the PE line are used separately, and if the two are shorted with conductors, it becomes a PE/N line.

The protection circuit of the device consists of a PE line (or PE/N line) that is installed separately and runs through the entire length of the arrangement

and conductive structural parts composed of two parts. Metal structural parts in the installation, except for the doors and sealing plates of the table,

The rest are galvanized, and at the junctions of the structural parts, they are carefully designed to pass a certain short-circuit current.

Protective earthing system

The protection circuit of the device consists of a PE line (or PE/N line) that is installed separately and runs through the entire length of the arrangement

It is composed of two parts of conductive structural parts. The metal structural parts in the device, except for the door and sealing plate of the table, the rest are warped

After galvanized treatment, the joints of the structural parts are carefully designed so that they can pass a certain short-circuit current.

Auxiliary circuitry and cable duct

The top of the functional unit compartment is equipped with auxiliary circuit cable ducts, and the slot can be used to place inter-switchgear connecting wires and common power lines.

Cable and control line connections

On the side of the withdrawable assembly, the cable chamber is equipped with wiring devices and terminals for connecting the outlet cables,

Control wiring between wire-bonding components. Wankong Electric Co., Ltd. as a professional transformer manufacturer, box-type substation manufacturer,European transformer, box transformer manufacturers, high and low voltage complete sets of power distribution switchgear manufacturers, will quote professional transformer prices for you and

The transformer quote, the entry and exit cable and the control line wiring device are arranged on the guide rail on the right side of the cable chamber.

The main circuit terminal is located at the rear and the control line terminal is located 45° ahead. The wiring of the control wire terminals can be screwed or inserted

Wire nose connection or copper connector. If the main circuit terminal on the adapter of the withdrawable component is less than 63A, it is equipped with PE terminal.

Security protection system

Each switchgear is equipped with a flame-retardant plastic functional board or a set of flame-retardant plastic functional boards, which are installed between the main busbar room and the electrical room, and its role is effective

Strict isolation measures are taken to prevent accidents caused by arcing and short circuits between the bus bar caused by faults of switching elements.

The upper and lower drawers are separated by galvanized metal bases with ventilation holes, and the smaller 8E/4,8E/2 drawers are surrounded on all sides

Flame-retardant engineering plastic parts, so there is a strong insulation and isolation effect between adjacent circuits. A variety of plastic components are used in the switchgear

Supporting the live section, these components are halogen-free and have CT1300 rated or higher leakage resistance.