Capacitance compensation is reactive power compensation or power factor compensation. The electric equipment of power system will produce reactive power when it is used, and it is usually inductive. It will reduce the capacity efficiency of power supply, and it can be improved by properly increasing the capacitance in the system.Power capacitance compensation is also called power factor compensation. Generally speaking, the low-voltage capacitor compensation cabinet is composed of cabinet shell, bus, circuit breaker, disconnector, thermal relay, contactor, lightning arrester, capacitor, reactor, primary and secondary conductors, terminal strip, power factor automatic compensation control device, panel instrument, etc

1.Ambient air temperature: -30℃~+50℃ and the average temperature should not exceed +50℃ in 24h
2.Indoor altitude above sea level: Maximum installation altitude: 2500m
3.Relative humidity should not exceed 50% at max temperature +40℃. Higher relative humidity is allowed at lower temperature. Ex. 90% at +20℃. But in view of the temperature change, it is possible that moderate dews will produce casually.
4.No fire, explosion danger, serious pollution, chemical corrosion and severe vibration
5.Installation gradient not exceed 5°
6.The equipment shall be installed in a place where there is no violent vibration and impact, and the place where the electrical components are not corroded.
7.Any specific requirement, consult with manufacture

1. Main circuit scheme
the main circuit scheme is for the design requirements of the power sector, the reactive power capacitor conpensation device ,so as to improve the active power ,reduce the reactive power and make the factor above 0.9.

2. Selection of electrical components
(1).The GGD cabinet mainly adopts advanced electrical components , but also according to the economic and reasonable principle, retain some of the available old DZ20 in full consideration of the feasibility of the premise, such as BRM1, do not use obsolete products.
(2).As the design department according to user needs, with more excellent performance, new electrical components, more advanced technology, because the GGD cabinet installation flexibility good, generally will not cause the difficulty of manufacturing and installation of the update for the electrical components.
(3). norder to further improve the dynamic stability of the main circuit, NLS designed the ZMJ type bus GGD cabinet special clamp and insulating support parts. Bus clamp is made of high strength, high flame retardant Pp0 alloy material, thermoplastic molding, high insulating strength, self extinguishing performance, unique structure, only need to adjust the block between the block easily combined into a single or double busbar busbar clamp clamp, insulating support sleeve is molded structure, low cost, high strength, the old product creepage distance is not defective.

1. The capacitor can keep the voltage at a high average value (near the peak value) (high charge and low discharge), which can improve the stability of the circuit voltage!

2. Give current compensation to the sudden start of large current load! The power compensation capacitor bank can provide huge instantaneous current! It can reduce the impact on the power grid!

3. A large number of inductive loads in the circuit will cause the phase deviation of the power grid (inductive components will cause the phase lag of AC current and the phase lead of voltage by 90 degrees!). However, the characteristics of capacitance in the circuit are exactly opposite to that of inductance, which plays a compensation role.Generally speaking, the low-voltage capacitor compensation cabinet is composed of cabinet shell, bus, circuit breaker, disconnector, thermal relay, contactor, lightning arrester, capacitor, reactor, primary and secondary conductors, terminal strip, power factor automatic compensation control device, panel instrument, etc.

4.Secondary control diagram of capacitance compensation: The selection of single group capacity for each group of capacity in the box shall be based on the minimum load of the transformer. For example, the load current I = 50A, the natural power factor is 0.8, and the reactive power to be compensated is:
Q = 3 ×U ×I × 1- co s2U= 3 ×0. 38×50× 1- 0. 82= 19. 7kvar
If the capacity of each group is greater than Q, it can not be put into operation or will cause over compensation after putting into operation. Therefore, it is suggested that the capacity of each group of capacitors should be 10 ~ 50kvar.

1.GGD AC low voltage distribution cabinet cabinet with universal cabinet form frame of 8MF or C type cold-formed steel by local welding assembly, frame parts and special parts by steel production plant sentinel supporting supply, to ensure the accuracy and quality of the cabinet. The cabinet general principle of 2 parts according to the module 0 module, which is provided with a mounting hole. The general coefficient is high, can make the factory implementation of pre production, which can shorten the manufacturing cycle, but also improve work efficiency.

2. The GGD cabinet is designed to take full account of the heat problem in the operation of the cabinet in the cabinet. The upper and lower ends are different number of radiating slots, hot air rises when the cabinet electric heating element, and discharged through the top slot, and the cold wind constantly from the bottom slot supplemented cabinet, the cabinet body bottom sealed to form a natural ventilation and to achieve the aim of heat radiation.

3 .The GGD cabinet according to the modern industrial product shape design, using the golden ratio design method of the cabinet body and cut size of each part, the entire cabinet appearance, new look.

4.The door hinge and frame shaft movably connected with the installation, convenient disassembly, are a mountain type rubber block the hem of the door, when the door between the door and the frame of the molding a compression stroke, and the cabinet door can prevent direct collision, also improve the level of protection of the door.

5. Equipped with the electrical components of the instrument door with many baling wires connected to a frame, mounting cabinet with frame with knurling screw fastening, the entire cabinet form a complete grounding protection system.

6. The selection of orange shaped Polyester Topcoat Paint, with strong adhesion, good texture, the entire cabinet is sub light tone, avoid glare effect, to the personnel on duty to create a more comfortable visual environment.

7.The cover can be removed during installation and adjustment for field bus, on top of the cabinet with four angle rings, used for lifting and loading.

8. Cabinet protection grade is IP41.

The product reaches destination, at first, they should check whether the packaging is intact, once they found the problem , they should be timely notify the relevant departments to do business contract records and analysis cause , prepare visa and deal with sales after. For the product not immediately install,they should be based on the conditions of normal use and electrical equipment for temporary custody at appropriate places for safe keeping.

1. The product should be installed according to the installation diagram (see Figure2). Adopting bolt to be fixed and foundation channel steel is owned by the user. When the main bus row of tin should be installed , the lap surface should repair leveling, clean, paint neutral Vaseline or other measures , and then fix it by bolts

2.Before commissioning ,inspect and test products after installation
(1). Check the panel paint came off and cabinet inside dry , clean..
(2). Whether electrical components of the operating mechanism is flexible, it should not be too large or too difficult to operate
(3). Whether the main and auxiliary contacts of main electrical appliances are reliable and accurate
(4).Instrument calibration setting, transformers’ ratio and polarity should be correct. (5).The connection of each busbar should be good, the insulation support, installation and other accessories should be installed firmly and reliably
(6).Whether the auxiliary contact meets the requirements, the fuse core specification is correct, the setting value of the relay meets the design requirements, and the action is reliable and accurate
(7).The circuit connecting point is in line with the electrical schematic diagram
(8)Whether protection circuit system meets the requirements
(9). The insulation resistance shall not be less than 11MΩ by using 690V megameter

3. Notice for using
(1). Device is not against wall installation, positive operation, double side maintenance for low voltage power distribution cabinet. Maintenance channel and cabinets door must be qualified professional personnel who shall enter into or open operation, inspection and maintenance.
(2). Air circuit breaker, molded case circuit breaker has several opened and closed, especially after short circuit opened and closed, it can make the contacts local burn and produce carbon material,which will cause the contact resistance increases, it should be carried out maintenance and inspection according to circuit breaker instructions.

The supplier shall provide the following documents and attachments:
1. Device list;
2. Product qualification certificate;
3. Instruction manual；
4. Factory test report;
5. Relevant electrical drawings;
6. Door key, operating handle and contract requires for spare parts;
7. Main components of the installation instructions