Sunday, August 25, 2013

Switch cabinet



   Switch cabinet
Switch cabinet (switch cabinet) is a kind of electrical equipment, external advanced into the cabinet master switch, and then enter the control switch, each branch is arranged according to their needs. Such as instrumentation, automation, motor magnetic switch, all kinds of AC contactor, and some also set a high pressure chamber and a low pressure chamber is provided with a high pressure switch cabinet, bus, such as power plants, some also equipped with low cycle and main equipment load reduction.

Five prevention

High voltage switch cabinet[1]"Five protection"
Vacuum 1 high voltage switch cabinet Circuit breaker The car after closing the test location, car circuit breaker can not enter the work place. (to prevent load switching)
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  • Master Switch
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Switch cabinet
2 high voltage switch cabinet grounding knife in the closed position, the car breaker fails to close. (prevent grounding switch)
3 high voltage switch cabinet vacuum circuit breaker in the closing work, cabinet The back door Mechanical and door locking grounding knife. (prevent mistakenly charged interval).
Vacuum circuit breaker 4 high voltage switch cabinet at work when closing, closing earthing knife can not be put into. (prevent electrified wire grounding)
Vacuum circuit breaker 5 high voltage switch cabinet operation in closing, unable to exit the car Circuit breaker Work location. (prevent loaded broach gate)

Common classification

According to the classification of voltage grade
According to the voltage rating of AC1000V and below will usually called Low voltage switch cabinet (such as PGL, GGD, GCK, GBD, MNS), AC1000V and above is called high voltage switch cabinet (such as GG-1A, XGN15, KYN48 etc.), sometimes also will voltage of high voltage switch cabinet for AC10kV is referred to as the MV Switchgear (such as XGN15 10kV ring network cabinet).
According to the classification of voltage waveform
Divided into: AC switch cabinet, DC switchgear.
According to the internal structure of classification
Draw out type switch cabinet (such as GCS, MNS etc.), fixed type switch cabinet (such as GCK, GGD etc.)
By end use classification
Incoming cabinet, outlet box, meter cabinet, compensation cabinet (capacitor), a corner cabinet, bus bar cabinet.

Operating procedures

Transmission procedure
1 first installed after sealing plate, then close the front door.
2 operating earthing switch and the brake spindle.
3 transfer vehicle (vehicle) will hand car (is in a closing state) into the cabinet (test position).
4 for the two time the plug into the static Socket On the (test position indicator lights), close the front door.
5 handle the trolley from the test position (off state) into the working position (position indicator lights, test position indicator arc).
The 6 switching circuit breaker handcart.
Power outage (maintenance) steps
1 the circuit breaker handcart switch.
2 handle the trolley from the working position (off state) exit to test position.
3 (working position indicator, test position indicator lights).
4 open the front door.
5 to two and pull the plug socket (static test position indicator arc).
6 transport vehicles will hand car (is in a closing state) from the outside of the cabinet.
7 operation Earthing switch Closing the spindle and the.
8 open the rear closing plate and the front door.
Note: Lightning arrester The truck and in (the) PT hand car can directly pull cabinet in the bus running time.

Related standards

SJ/T 31401-1994| high voltage switch cabinet requirements and methods of inspection and assessment.
DL/T 791-2001| indoor AC inflatable type switch cabinet selection guide.
Technical specification for DL 404-1991| indoor AC high-voltage switch cabinet order.
Technical specification for DL/T 404-1997| indoor AC high-voltage switch cabinet order.
DL/T 539-1993| indoor AC high voltage switch cabinet and components technical conditions for condensation and pollution test.
Technical condition of cabinet of TB/T 2010-1987|27.5kV AC electrified railway switch.
Technical specification for DL/T 404-2007| indoor AC high-voltage switch cabinet order.

Series introduction

GCK series

[2]G is a closed switch cabinet; C is out of style; K is a motor control center.
GCK low voltage switchgear (hereinafter referred to as the switch cabinet) by the power distribution center (PC) cabinet and motor control center (MCC) is composed of two parts. The device is suitable for use in AC 50 (60) HZ, rated voltage is less than or equal to 660V, rated current 4000A and control of distribution system as following, power distribution, motor control and lighting distribution equipment.
GCK switch cabinet with IEC60439-1 "low voltage switchgear and control equipment", GB7251.1-1997 "low voltage switchgear and control equipment", the standard GB/T14048.1-93 "low voltage switchgear and controlgear general". Switch Talent Network Mentioned such enterprises production standards and has high breaking capacity, good dynamic stability, advanced and reasonable structure, flexible electric scheme, series, strong versatility, any combination of various program unit, a cabinet body. Number of loop more contained, save the area, protection class is high, safe and reliable, advantages repair convenience etc..
Structural characteristics
1, the entire cabinet adopts an assembly type structure, modular holes, strong versatility, good adaptability, high degree of standardization.
2, upper part of the cabinet body for busbar compartment, front An electric appliance Room, rear Cable Import line room, each room is steel or insulating plate for the isolation, in order to ensure safety.
3, the operating handle door and the breaker or switch MCC cabinet drawer chamber is arranged in the mechanical interlock, only the handle in the off position when the door can be opened.
4, the electric switch, touch switch and the MCC cabinet drawer has three positions: the on position, test position, the off position.
The top 5 switch cabinet can be arranged according to the busbar bridge power.
The implementation of standards:
This product complies with GB7251.1-2005[3]"Low voltage switchgear and control equipment" and JB/T9661-1999 "requirements for low voltage withdrawable switchgear equipment".

MNS series

Use[4]
MNS Low voltage withdrawable switchgear (hereinafter referred to as the switch cabinet) in order to adapt to the development of electric power industry demand, reference to foreign MNS series low voltage switch cabinet design and advanced low voltage switchgear to improve the development, the products meet the national standard GB7251, VDE660 and ZBK36001-89 "low voltage withdrawable switchgear equipment", the international standard IEC60439 MNS type Low voltage switch cabinet To adapt to a variety of power supply, power distribution need, can be widely used in power plants, substations, industrial and mining enterprises, building hotels, municipal construction and other Low voltage power distribution System.
Structural characteristics
1.MNS low voltage switch cabinet frame is a combined structure, the basic framework is composed of a C type steel assembly structure. All the cabinet frame member after galvanized processing, through Self tapping locking screws Or 8.8 level six angle bolted connection into the basic frame, and corresponds to the changes of door, partition, the mounting bracket and bus function unit and other parts are assembled into a complete switch cabinet. The internal dimension, switch cabinet parts size, compartment size in accordance with the modular (E=25mm) changes.
The 2.MNS type low voltage switch cabinet every cabinet is divided into three chambers, namely horizontal busbar chamber (in the cabinet, drawer chamber (rear) in the cabinet room (front), cable in the cabinet or cabinet bottom right). Between the rooms and rooms are separated from each other by steel or high strength plastic board, between the upper and lower drawer with ventilation hole Metal In isolation, to prevent fly short arc or bus with other circuit switching element for failure caused the accident.
Structure design of 3.MNS type low voltage switch cabinet can meet various requirements on import line scheme: progress, progress under the lower, upper, lower in and out.
4 compact design: functional unit to the smaller space to accommodate more.
5 pieces of the structure is universal, flexible assembly, E=25mm module, structure and the withdrawable unit can be any combination, in order to satisfy the need of system design
High strength flame retardant with 6 bus, plastic board protection strength of high insulation, anti Arc fault The performance of the operation, safe and reliable repair
Mechanical interlocking mechanism of 7 kinds of size drawer meeting the prescribed standards, connection, test, separation of three distinct position, safe and reliable.
8 the standard module design: can be composed of protection, respectively, conversion, control, regulation, determination, indicating the standard unit, can be assembled according to the requirements of any.
9 high strength flame-retardant engineering plastics, and effectively strengthen the security performance.
10 general purpose, high degree of standardization, convenient assembly. With reliable quality assurance.
11 cabinet according to the different requirements of the working environment protection level of phase censure.
12 Equipment Protect the continuity and reliability.
13.MNS3.0 maximum current carrying capacity is 6300A, the impact of short-circuit current of main busbar is 220kA tolerance.

MCS series

Use:
MCS intelligent low voltage withdrawable switchgear is a fusion of the advantages of other low voltage products and the development of advanced products, suitable for power plant, petrochemical, metallurgical, electrical, light industry, textile, high-rise buildings and other civil, industrial and mining enterprises of the three-phase AC 50HZ, 60HZ, rated voltage 380V, rated current 4000A and the three-phase four wire system (five) Power system The distribution system in large power plant, petrochemical, telecommunications systems, automation degree high, as required to interface with the computer places, in the power supply system, power distribution, motor control, Wattless power compensation Low voltage power distribution device.
Structural characteristics:
The basic framework of the 1 switch cabinet with C (or 8MF) open type steel assembly, is uniform, high precision, good interchangeability.
The 2.MCC cabinet width is only 600mm, the use of a large space, can accommodate more functional units, saving the land for construction.
3 elements in the cabinet according to the different needs of users, various types of switch configuration, ensure product reliability.
The 4 device for automatic interface, also can put the intelligent module is installed in the switch cabinet, realize remote, telemetry, remote control three remote function.
5 drawer function unit can be divided into MCCI, MCCII, MCCIII three.
Type MCCI: drawer width 600mm, height 180mm, 360mm, 540mm three, each cabinet installation height of 1800mm, are combined according to the required size of the drawer, can be mounted up to 10 units, motor control center, suitable for high current and feed loop.
Type MCCII: drawer width 600/2mm, height 200mm, can be installed height of 1800mm, are combined according to the required size of the drawer, can be mounted up to 18 units, the following applies to 100A unit.
Type MCCIII: drawer width 600/2mm, height 180mm, 360mm, 540mm three, can be installed height of 1800mm, are combined according to the required size of the drawer, can be mounted up to 20 loops, the following applies to 100A unit.
Operating mechanism: each drawer are provided with the operating mechanism of a specially designed, for breaking and closing the switch, and has the mechanical interlock and other anti misoperation function, MCCI type drawer has a "disconnect", "test", "work", "from" four position The positioning device The drawer, the wave into the structure, MCCII type, MCCIII type drawer unit is push-pull type, is provided with a positioning device, and has anti misoperation function.
GGD series
Models and implications of products: G (first) said AC low-voltage distribution cabinet; G (second) said electrical components is fixed, fixed route; D power cabinet.
Use
Type GGD AC low voltage power distribution cabinet Applicable to substations, power plants, factories and other power users of AC 50Hz, rated voltage 380V, rated working Electric current 1000-3150A Distribution system As the power, Lighting And the power distribution equipment Electrical energy Conversion, distribution and control purposes.
Structural characteristics:
Type GGD AC low voltage Power distribution cabinet According to the Department of energy, the majority of power users and the requirements of the design department, in accordance with the safety, economic, reasonable, new type low-voltage distribution cabinet design principles of reliable. Products with high breaking capacity, dynamic thermal stability, electrical scheme is flexible, convenient combination, series resistance, strong practicability, novel structure, high protection grade. Can be used as a replacement of low voltage switchgear products.

Difference

GCS, GCK, MNS, GGD switchgear difference
1GGD is a fixed cabinet, GCK, GCS, MNS is the drawer cabinet;
2GCK cabinet and GCS, different MNS cabinet drawer pushing mechanism;
3GCS cabinet can only do single cabinet, cabinet depth 800mm,;
4MNS cabinet can do double-sided operation cabinet, cabinet depth 1000mm.

The advantages and disadvantages

Advantage

Generally speaking: draw out type cabinet is local, convenient maintenance, line circuit, but the cost is expensive; and fixed relative to the output circuit, covers an area of more. If the customer to provide the location of too little, not fixed to do out of style.
Type GGD AC low voltage Switch cabinet : the switch cabinet has reasonable structure, convenient installation and maintenance, good protective performance, high breaking capacity, large capacity, piecewise ability, dynamic stability, electrical plan has many advantages such as wide applicability, and can be used as replacement products.
Disadvantages: loop, units are not any combination and covers an area of large, not with the computer liaison.
GCK switch cabinet and has high breaking capacity, good dynamic stability, advanced and reasonable structure, Electrical Flexible, series, strong versatility, any combination of various schemes. A cabinet unit, number of loop more accommodating, save the area, high degree of protection, safe and reliable, has the advantages of convenient repair.
Disadvantages: the level of bus in the top of the cabinet vertical bus without flame retardant plastic board, not with the computer liaison.
GCS low voltage withdrawable switch cabinet: with high technical performance indicators, to meet the needs of the development of power market, and with the introduction of product competition. According to the safety, economic, reasonable, a new low-voltage principles for the design of reliable draw out type switch cabinet, but also has broken, making capacity, dynamic thermal stability, electrical plan flexible, convenient combination, a series of strong practicality, novel structure, high protection grade.

Shortcomings

MNS series product advantages:
The compact design: functional unit to the smaller space to accept more.
◆ structural versatility, flexible assembly: in the 25mm C section modulus can meet a variety of structural forms, the level of protection and use of environmental requirements.
◆ adopt standard module design: can be composed of protection, respectively, conversion, control, regulation, indicating the standard unit, the user can be arbitrarily selected assembly.
◆ high technical performance. The main parameters of the technology level of the contemporary international.
◆ compression site. Three degree is high, can be greatly compressed storage and transport of pre production site.
◆ convenient assembly does not need special complexity.
Shortcomings:
MCS low voltage withdrawable switchgear advantages:
(1) cabinet with C type steel assembly, is uniform, high precision, good interchangeability;
(2) the MCC cabinet width is only 600mm, while the use of large capacity, can accommodate more functional units, saving the land for construction;
(3) the elements in the cabinet according to the different needs of users, switch configuration of various types, to better ensure product reliability;
(4) the device for automatic interface, also can put the module installed in the switch cabinet, realize remote, telemetry, remote control and other "three remote" function and control equipment
Shortcomings: high cost, has the certain difficulty for small user.

Conditions of use:

Environment temperature: -20 ℃ ~ +40 ℃:
The altitude does not exceed 2000M;
The ambient air relative humidity of not more than 95% (25 ℃);
In the mine gas and coal dust explosion hazard free, no violent vibration of the place;
In the gas without sufficient corrosion and damage to the insulation and vapor environments;
Allowing a small amount of vertical drop.[5]

The insulation defect

Common defects and causes

The 1.1 air gap small
For a long time, some of the high voltage switch cabinet manufacturer, not strictly implement the relevant technical standards, the 10kV high voltage switch cabinet and some within the running of the charged body and phase, phase between the air gap in between 100 ~ 125mm. As the pure air insulated Electrical equipment , "clearly defined rules" technology design of HV distribution device in 10kV system, the minimum clearance of pure air insulated 125mm. From the AC voltage withstand test results, combined with the accident analysis can be seen, the minimum air 10kV high voltage switch cabinet body charged between phases, and the insulating gap, less than 125mm, easy to have an accident.
1.2 accessories insulation performance is poor
China's 10kV High voltage switch cabinet Of the many manufacturers, some manufacturers in order to reduce the cost, the insulation accessories level low, causing the entire switch cabinets pollution flashover voltage is reduced, not rated standards.
In accordance with the "6 ~ 10kV high voltage switch cabinet selection principle", combined with the actual operation experience, the author thinks that 10kV high voltage switch cabinet accessories surface insulation creepage distance, should not be less than the following requirements: porcelain insulator 18mm/kV, organic insulator 20mm/kV.
1.3 using the composite insulation, should not ignore the air gap
Some 10kV high voltage switch cabinet is provided with an insulating clapboard, material, form a charged body -- -- -- air gap insulated clapboards grounding body of this composite insulation mode.
From the actual situation, the composite insulation, can not ignore the air gap, the smallest air gap is not less than 30mm, otherwise easily lead to an accident.
1.4 operating environment is poor, low maintenance quality
In general, poor operating environment 10kV high voltage switch cabinet, often affected such as dust, smoke, steam, so that the surface of the insulating layer is corrosion, generation of conductive material, insulation defects. And the switch cabinet individual units, do not pay attention to maintenance of equipment, maintenance, not timely discover and eliminate all kinds of insulation defects, resulting in insulation accident.

Suggestions

2.1 10kV high voltage switch cabinet design and manufacturing departments, should be strictly enforced insulation standards, good insulation gap and parts quality.
2.2 10kV high voltage switch cabinet units, in the pre operation, must make AC withstand voltage test, if the test results are not in accordance with the relevant provisions of "preventive test rules", should be resolutely for return processing; the 10kV high voltage switch cabinet in the operation, maintenance, maintenance work should be fully prepared, and as far as possible to improve operating environment.

Microcomputer protection device for switch cabinet

Brief introduction of switch cabinet microcomputer protection device

The application of the system: 35KV and below voltage is not grounded, small resistance grounding, arc suppression coil grounding, grounded system; the scope of protection: can be used for inlet, outlet and circuit protection, can also be used, PT, main transformer backup protection, motor,
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Microcomputer protection device for switch cabinet

Capacitors, reactors and other protective equipment;
Protection function: universal, more than 30 kinds of protection functions, not all occasions, need what function what line;
Measurement function: high accuracy class 0.2 professional measurement, can measure more than ten kinds of electrical parameters;
Operation: trip proof loop, with bats, self maintaining function;
The appearance of the product: 100mm ultra-thin metal fuselage, strong anti electromagnetic interference ability, suitable for KYN28 switchgear;

Characteristics of switch cabinet microcomputer protection device

Switch Yang microcomputer protection device with protection, measurement, monitoring, control, man-machine interface, communication and other functions in one; instead of the conventional relay and measuring instruments, saves the installation space and the large number of control cable.
■ adopts 32 bit digital signal processor (DSP), with advanced kernel structure, high speed and real-time signal processing and other excellent characteristics.
■ RS485 bus and DeviceNet routine (CAN) field bus, CAN bus has the error frame automatic retransmission and fault node automatically from the error correction mechanism, ensure the real-time and reliability of information transmission. The highest rate of 1Mbps, the longest distance 10km, a bus allows up to connect 110 devices.
■ sealed metal box, ultra-thin design, chassis net deep only 100mm, can be installed in any cabinet type, especially the ring network cabinet.
The surface mount technology (such as an important device for ■, chip, power supply module, relay, transformer, capacitor, liquid crystal display, terminal etc.) are mature products of foreign well-known enterprises, the mean time to failure for up to 100000 hours.
■ perfect self inspection ability, found the device can automatically alarm of abnormal; self protection ability, effectively prevent permanent caused by wrong wiring or non normal operation of damage; maintenance free design, no need to adjust the sampling accuracy in the field, the measurement accuracy will not because of the environment change and long-term operation caused the error.
■ international universal input power supply module, compatible with 85 ~ 264V AC or DC power supply, power supply and voltage drop in the mutant had outstanding performance
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  • Corner Cabinet
  • Tax Bracket
  • Connect
  • The front door
  • Electric power industry
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Microcomputer protection device for switch cabinet





justinamaefeliciano
markjosephmontelibano
queenianyanson
infotech 2 a

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