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Multifunctional Electricity Controller & Optimizer(MEC)

Update:2017/6/20      Click:

Simultaneous compensation of reactive power,harmonic,three-phase imbalance,power-dazzling,and voltage

       The NME series of power distribution network-dedicated multifunctional electricity controller & optimizer (MEC) has passed the test of China National Center for Quality Supervision and Test of Electrical Control and Distribution Equipment, available for rapidly compensating the reactive power and filtering out harmonic at a rate over 80%, This system has a stronger ability in restraining the voltage fluctuation and flickering, effectively compensates the voltage drops with the drop depth and width respectively below 50% and within 100ms, and effectively restrains the three-phase imbalance, rendering superior reliability and stability, With the response time smaller than 3ms it can solve the defects of traditional shunt capacitors and well satisfy the requirements on the quality improvement of electric energy and energy-saving application of power distribution network.

 

MEC electrical structure diagra

ØComparison table of MEC to traditional switch capacitor

Product

Multifunctional electricity controller & optimizer (MEC

Mechanical switch capacitor (MSC

Thyristor-switched capacitor (TSC

Response speed

≤2ms

300ms

20ms

Reactive power compensation ability

Rated capacitive reactive power to rated inductive reactive power, 0.1kVar precision, and up to 1 power factor

0 to rated capacitive reactive power, stair-like adjustment, transient and possible over-compensation and under-compensation, with the average power factor up to standard

0 to rated capacitive reactive power, stair-like adjustment, transient and easy for over-compensation and under-compensation, with the average power factor up to standard

Harmonic control ability

Filter out harmonics for 2-13 times, filtering rate over 80%, no resonance oscillation risks

No harmonic-filtering ability, large harmonics amplification and resonance risks

No harmonic-filtering ability, large harmonics amplification and resonance risks

Three-phase imbalance contro

Strong, adjustable three-phase active power

None

None

Voltage stabilization ability

Strong, output capacity not change along with the drop of voltage, fast response to voltage leap

Worse, the output capacity decreases by squares when the voltage decreases, resulting in system voltage fluctuation during switching

Worse, the output capacity decreases by squares when the voltage decreases, resulting in system voltage fluctuation during switching

Anti-electricity dazzling ability

Possess the ability of preventing electricity dazzling from +10% to -50%

None

None

Reliability

Without capacitance wearing parts, and failure-free operating time of 100,000 hours

With the switch-on rush current, over-voltage and resonance phenomena, the contactor is vulnerable to contact welding, and the capacitor is vulnerable to damages due to harmonics, with a high fault rate

With the switch-on rush current, over-voltage and resonance phenomena, and the capacitor is vulnerable to damages due to harmonics, with a high fault rate

Service life

Design life over 20 years

Capacitance attenuation, service life of 2-3 years

Capacitance attenuation, service life of 2-3 years

Maintenance cost

Low, maintenance-free

High, the capacitor should be replaced annually at later stage

High, the capacitor should be replaced annually at later stage

Impacts on the service life of transformer

Power compensation, harmonic filtering, adjustment of three-phase balance, reducing the load rate and temperature rise of transformer, and increasing the service life of transformer by 50%

Only compensating the reactive power, and impossible for eliminating the major damages on transformer caused by harmonics and three-phase imbalance, resulting in high load rate and short service life of transformer. The transformer may be burnt up due to resonance

Only compensating the reactive power, and impossible for eliminating the major damages on transformer caused by harmonics and three-phase imbalance, resulting in high load rate and short service life of transformer. The transformer may be burnt up due to resonance

Remote monitoring

With the Bluetooth+GPRS monitoring function, available for networking remote management

None

None 

ØFeatures

 

ØApplication fields

1. 200V, 400V, 600V, and 750V, and unit capacity up to 10Mvar;
2. Simultaneous compensation of reactive power, harmonic, three-phase imbalance, electricity-dazzling;
3. Modular parallel design, the module failure imposes no impacts on the operation of other modules, available for live replacement what gives high reliability;
4. Integrate functions of SVG and APF into one, low cost;
5. Adopt the PWM interleaving technique, with low harmonic of itself;
6. Small land occupation area, and the design life up to 20 years.
 
1. Power system in need of comprehensive compensation against reactive power, harmonic and three-phase imbalance.
2. Power system sensitive to the voltage fluctuation and flickering of power network, such as that related to precise textile.
3. High voltage and ultra-high voltage flexible AC power transmission.
4. Compensation to large industrial consumers such as steel metallurgical enterprises and petrochemical engineering enterprise.
5. The remote and border areas with poor electricity availability, such as the rural areas, mountainous areas, and wind power plant.
6. Special compensation to large loads such as the rolling mill, electric-arc furnace, electrified rail traction power station, etc.

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