LOW Voltage SVG

Product Overview

It is the best choice to use power quality comprehensive compensator to solve the problem of power quality in 400V distribution network. But the power quality compensator of distribution network is expensive and costly, and users have withstand limit which will result in difficult
promotion and less use rate. Analyzing the power quality of 400V distribution network, it's mainly to solve the problems of power factor, three phase unbalance, zero sequence current and higher harmonic. In these items, the proportion of power factor is the biggest, which reaches more than 80%.90% of the line load is inductive load, and the mature method to solve the inductive load is capacitance compensation.
There are 3 aspects of deficiency of capacitor. Firstly, it can only compensate the inductive load, but no capacitive load; Secondly, it can only compensate the power factor, but no three phase unbalance, zero sequence current and high harmonic; Thirdly, it can only step
compensation, no linear compensation, with long reaction time and can not compensation timely. The development of the SVG combines electric power quality comprehensive compensator and capacitor compensator, to use capacitor compensator as the main components to solve the power factor and use power quality comprehensive compensator as a solution to the three phase unbalance, zero sequence current, higher harmonics and fine compensation of capacitance compensation, which will achieve linear compensation effect.
The SVG has developed a controller and control program to achieve the same performance of the power quality comprehensive compensator of the distribution network, which greatly reduce the cost of the compensator, so as to facilitate the promotion.

Product Model

Product Principle

The product is composed of power quality compensator of distribution network, capacitor, reactor, controller and so on. The wiring diagram is shown in figure 1:

负荷侧 Load side  控制器 Controller  电能质量补偿器 Power quality compensator  同步开关 Synchronous switch

The working principle is to obtain the current signal through the current transformer on the circuit line on which to get the voltage signal. through the controller calculation and the control of capacitance and power quality compensator, first to input corresponding capacitance to
compensate the power factor of the line roughly, and then to carefully compensate through the power quality comprehensive compensator of distribution network, to realize the requirement of linear compensation, meanwhile to compensate three phase unbalance, zero sequence
current and higher harmonic, which will improve power quality.
 

Technical Performance

 The power factor is maintained at 0.95 and above (can be set);
●Three phase unbalanced ratio is no more than 10%;
●Zero sequence current is no more than 3a;
●Higher harmonic is lower than the national standard limit;
●Stabilize system voltage, 0.4kv side voltage generally requires less than 0.45kv(can be set);
●Rated output current of dynamic compensation thd is no more than 3% ;
●Reactive power capacity of compensation automatically track the change of power grid;
●Response time of dynamic compensation is no more than 10ms;
●Allow short-time overload capacity 1.2 times;
● Perfect protection function;
● Friendly man-machine interface;
● Flexible communication interface, which could remote monitor the device operation, and record the operation data; 
●The cooling method adopts forced air cooling.

Shape and Dimension

Outdoor

Indoor Substation

Box-type Transformer

Protection Function

Over-current protection of the device;
Over-voltage protection of the grid;
Fire voltage protection of the grid;
Over-voltage protection of the unit;
Over-temperature protection of the unit;
Short-circuit protection of the unit;
Abnormal communication protection of the unit;
Abnormal fiber transmission protection;

If any circuit faults in the device, there will be alarm, shutdown and other countermeasures, and timely upload which will not affect the higher system. The whole set of equipment realizes automatic detection, remote manual switching and short distance manual switching, and there is reliable locking between the above three methods to prevent accidents. Detection and control are fully automatic unattended. If the line is abnormal, such as over-voltage or under voltage, the device is automatically removed; if the line is restored to normal, and the device is put into operation automatically.
 

Operating Environment Requirements
Rated voltage: 0. 4kV
Maximum voltage: 0. 45kV
Rated frequency: 50Hz
Storage temperature: -40C- +65C
Running temperature: -20C- +40C
Relative humidity: the monthly average value is not more than 90% (25"C), no gel 
Altitude: < 1 000M
Protection level: IP43 or customized according to user's requirement
Earthquake intensity: 8 degrees
Control power: 220VAC
Pollution class: IV level

Service Commitment
Service method: on-site service and telephone advice or fax.
Take actions after receiving the user's response within 2 hours; If emergency issue, service personnel will arrive on the site within 24 hours
in the province and within 48 hours out of the province.
Ensure the dispatched personnel obey the rules and regulations of the field, and have the obligation to train the knowledge of operation
and maintenance of the equipment for the customers.
In time to provide customers with all technical information stipulated in the contract or agreement.
 

Order Note

Please see the manual, as far as possible to provide the company's product models and specifications.
Provide transformer capacity, load type and power factor without compensation.
Estimate the maximum three-phase unbalance rate.

As to the replacement of the operational project, please provide the monthly average power, average reactive power, the power factor
after compensation, three-phase current records and the recent changes in electricity consumption.
 Special requirements should negotiate with manufacturers.
Determine the delivery date.