Static Var Compensator

High reliability: The SCR is installed in low voltage circuit, not in main circuit, so, the withstanding voltage is just 1% of main circuit voltage. Low harmonic contents: THD is below of 5%, which comply with related national criterion, if the multiple connections are adopted, the THD can be reduced below of 1.2%. Small dimension: the dimension of MCR is about 2/5 of TCR. It can be able to connect in high voltage power grid, the cost and floor space are reduced dramatically. Fast response time(100~300ms), it can fully meet the demand of dynamic reactive power compensation of power equipments. No need of cooling devices, which reduce the fault rate, maintenance cost and floor space. The advantage of MCR-typed SVC The MCR-typed SVC was based on traditional saturation reactor technology; it was put forward by Russia scientists. They introduced the concept of magnetic valve creatively to just make the small section of iron core saturation, which solved the high harmonic problems caused by traditional saturation reactor, because all iron cores in traditional saturation reactor are excessive saturation, then result in nonlinear harmonic. At the same time, the SVC of MCR type reduced the dimension, weight and noise of entire system; it has many advantages, such as: low harmonics, fast response time, high voltage withstanding level, stable operation, small floor space and long service life. Therefore, the SVC of MCR type is quickly spreading in Russia, Ukraine, America, India, China and other countries. It plays a very important role in improving power quality, decreasing reactive power loss, stabilizing power grid voltage and enhancing the reliability of power grid operation.Because MCR-typed SVC adopted advanced micro-electronics technology, it can regulate reactive power demand and compensation on bus bar accurately: The inductive reactive current in main circuit can be adjusted through changing low voltage DC to regulate main circuit impedance fast and smoothly, meanwhile, through cooperating with capacitor bank paralleled in bus bar, reactive power compensation demand can be realized on bus bar, and dynamic response and improved power factor can stabilize bus bar voltage. Choosing reactor parameters properly connected in series with capacitor bank, the compensation on fundamental wave can be obtained, and the harmonic also can be filtered. Because the SVC of MCR is free of frequent switching from mechanical parts, then it avoids surge and over-voltage impact caused by MSC, which enhances the reliability and the service life of the equipment, as well, protects the other instruments. The SVC of MCR type fully absorbed advantages and functions of TCR-typed SVC by comparison; it solved the problems of smooth regulation which can not be realized by MSC and TSC, and also overcome some disadvantages of TCR-typed SVC. Because the reactor is connected to high voltage main circuit directly in series, it must stand extra high voltage and ultra high voltage. At present, the highest voltage of reactor in our country reach to 1000KV, and the maximum capacity reach to 320MVar. The reactor also has over-load function; it will not generate big damage to system except heating, while, the thyristors in TCR-typed SVC is connected to high voltage circuit directly, the over-voltage will result in faults and break. So it is very stable for MCR-typed SVC to operate under the high voltage circuit with free of maintenance. Wooden case (Fumigation).

The svc is made up of controllable reactance, passive filters (fc), and control and protection unit. At present, terms of the principle on which the reactance is adjusted, static var compensators are classified into three types: thyristor-controlled transformer (tcr), thyristor-controlled reactor (tcr), magnetic-controlled reactor (mcr). For their working principle and difference, see í¦svc operating principle Senbao has developed all the three types of static var compensator and launched them on the market successfully. As the only manufacturer in china possessing proprietary intellectual property right of the three types of svc, senbao offers the best performance-to-cost svc solutions and complete set of equipment to fulfill user requirements. Technical specifictations: 1.Rated voltageú¦6íó10íó35kv 2.Rated capacityú¦6~100mvarú¿tcrú¬ú¼ín30 mvarú¿tctú¬ú¼ín30 mvarú¿mcrú¬ 3.Response timeú¦10msú¿tcrú¬ú¼10msú¿tctú¬ú¼300msú¿mcrú¬ 4.Thyristor coolingú¦heat pipe self-cooling plus fans (tcr), heat pipe self-cooling plus fans (tct), self-cooling (mcr) 5. Thyristor triggering: optical fiber plus electro-magnetic (tcr), electro-magnetic (tct), optical fiber (mcr) 6. Controller: all-digital 7. Control modes: voltage, reactive power, power factor, or combination 8. Dynamic regulation: combination of open loop and closed loop control 9. Regulation mode: phase splitting control, compensatiing for unbalanced load 10.Useful life: 10 years 11.Environment: the svc can be made to work normally under user-specific environmental conditions.

As a upgrade var compensator for substations, the svqr has remarkable advanteges in many aspects such as var compensation precision, , response speed, stabilization of system voltage, reduction of line losses, and enhancement of transmission capacity. Senbao developed, for the first time in china, the substation var compensator, svqr, whose output is changed by regulating voltage across the capacitor. The svqr has found wide applications in substations. With complete hv and lv testing beds and the-state-of-the-art dsp-based control system development system, senbao has gathered a large army of excellent professionls and has passed the national iso 9001 quality system certification. The svqr is widely applied not only for new substations, but also for upgrading of existing substations, transforming the existing manual 1-step tbb into an automatic 9-step voltage-regulating-type var compensator. Senbao svqr has been operating successfully at an altude of 4, 000 meters in the cold area of shangri-la, yunnan, way ahead of the domestic manufacturers of the like products.

The DWK is a new type of pole-mounting high-voltage var (reactive power) compensators. It consists of current transformers, potential transformers, controller, vacuum contactor and shunt capacitors. The DWK features high level automation, small size, light weight, and easy installation. It is mostly applied to 6kV and 10kV distribution lines, switching capacitors automatically on multiple modes such as voltage, time, voltage/time, voltage/var, and power factor. Integrating static and dynamic compensation and multi-step switching has realized more precise reactive power compensation on HV distribution lines, thus greatly raising the power factors in the system and reducing power loss on distribution transformers and lines. The DWK is a powerful instrument for enhancing power delivery efficiency and improving user power quality. The DWK has been patented for originality, Patent Number: ZL02 2 92526.0. 1ú«Parameters of compensator 1)Compensation capacityú¦50kvar~1000kvar 2)Primary circuit power frequency withstand voltageú¦42kV/min 3)Break power frequency withstand voltageú¦ 42kV/1min 4)Secondary circuit withstand voltageú¦ 2.5kV/min 5)Lightning impulse withstand voltage (peak)ú¦75kV.

Product Structure 1. Bypass Cabinet (Optional) The by-pass cabinet or switching cabinet may employ isolating breaker, vacuum contactor or the combination, depending on the user¡¯s working conditions. The function of by-pass cabinet is to put the motor into operation in industry frequency grid after the WLD-HVF exits, so as to ensure the continuity of user¡¯s production. The switching cabinet is designed to divert the WLD-HVF output to different motors. 2. Transformer Cabinet Used for installation of Phase-shift transformer, it is dry type transformer with functions of temperature display and over-heat protection, also with insulation grade of H. The secondary multi-winding output provides phase-shift power supply to the power unit. This can greatly improve the current waveform on grid side and reduce the harmonic interference of the equipment to power grid lower of the National Criterion. 3. Power Unit Cabinet Used for installation of power units, which adopted imported high quality components inside, all power units are installed on the sliding seat, it is very easy to replace. 4. Control Cabinet Used for installation of low voltage control components, there are controller, PLC, UPS, Electric siren, DC 24V power supply, Control Power Source Switch, Wiring Terminals, Touch Screen, Operation Button etc. The equipment adopted fiber optical communications, which has a very good EMI restraining performance; The transformer, control cabinet and all power units, are built in temperature protection, so it will be maintenance free. Technical Features Voltage source High-high frequency inverter, it can realize No-step speed regulation, which makes the typical motors into intelligent motors. Low harmonics input and high power factor, the typical value for power factor is 0.95 through whole speed regulation, even more higher, no need for power factor compensation. WLD-HVF output few harmonics, the motor does not generate extra heat and noise. Modularized design of power units, interchangeable and easy to produce and repair, the equipment can find any fault exactly based on advanced diagnostic procedures in MPU. The inverter still can operate even the faults for part of power units exists, if there are faults happen for inverter, the system can switch to power frequency through bypass function. Applicable to all kinds of power grid at home and abroad and suitable for typical high voltage motor. Colorful touch screen, easy to operate and maintenance. Able to realize remote control, DCS operation and communications with Host, and support all kinds of communications interfaces such as CAN, Profibus, Modbus, RS232, RS485 etc. Applied latest components, master control chip adopted TI¡¯s DSP F28335 and ALTERA¡¯s FPGA of EP3C to realize powerful processing capacity; Sampling adopted AD¡¯s AD7606 with 16 bit to ensure control accuracy of the system. The switchgear can satisfy safety requirements, and the pressure-relief channel of high voltage switch can ensure safe use of operators. Technical Parameters Series No Parameters Value 1 HVF Capacity(KVA) 250~8750kVA 2 Power of adaptive motor(KW) 200~7000KW 3 Input Frequency(Hz) 45~65Hz 4 Harmonics contents injected to power grid 0.95%(>20% of rated load) 7 Efficiency >96%(under a rated load) 8 Output frequency(Hz) 0.5~120Hz 9 Precision of output frequency 0.01Hz 10 Rated output current(A) 36~600A 11 Overload capability 120%(1min), 150%(3s), 200%(Immediate protection) 12 Control mode V/F control or Vector control 13 Analog input 0~10V/4~20mA 14 Analog output 0~10V/4~20mA Optional (2 channels) 15 Boolean input/output Communications/Default point (expandable) 16 Acc & Dec time (S) 0.1~3000s 17 Altitude

Product Structure 1. Bypass Cabinet (Optional) The by-pass cabinet or switching cabinet may employ isolating breaker, vacuum contactor or the combination, depending on the user¡¯s working conditions. The function of by-pass cabinet is to put the motor into operation in industry frequency grid after the WLD-HVF exits, so as to ensure the continuity of user¡¯s production. The switching cabinet is designed to divert the WLD-HVF output to different motors. 2. Transformer Cabinet Used for installation of Phase-shift transformer, it is dry type transformer with functions of temperature display and over-heat protection, also with insulation grade of H. The secondary multi-winding output provides phase-shift power supply to the power unit. This can greatly improve the current waveform on grid side and reduce the harmonic interference of the equipment to power grid lower of the National Criterion. 3. Power Unit Cabinet Used for installation of power units, which adopted imported high quality components inside, all power units are installed on the sliding seat, it is very easy to replace. 4. Control Cabinet Used for installation of low voltage control components, there are controller, PLC, UPS, Electric siren, DC 24V power supply, Control Power Source Switch, Wiring Terminals, Touch Screen, Operation Button etc. The equipment adopted fiber optical communications, which has a very good EMI restraining performance; The transformer, control cabinet and all power units, are built in temperature protection, so it will be maintenance free. Technical Features Voltage source High-high frequency inverter, it can realize No-step speed regulation, which makes the typical motors into intelligent motors. Low harmonics input and high power factor, the typical value for power factor is 0.95 through whole speed regulation, even more higher, no need for power factor compensation. WLD-HVF output few harmonics, the motor does not generate extra heat and noise. Modularized design of power units, interchangeable and easy to produce and repair, the equipment can find any fault exactly based on advanced diagnostic procedures in MPU. The inverter still can operate even the faults for part of power units exists, if there are faults happen for inverter, the system can switch to power frequency through bypass function. Applicable to all kinds of power grid at home and abroad and suitable for typical high voltage motor. Colorful touch screen, easy to operate and maintenance. Able to realize remote control, DCS operation and communications with Host, and support all kinds of communications interfaces such as CAN, Profibus, Modbus, RS232, RS485 etc. Applied latest components, master control chip adopted TI¡¯s DSP F28335 and ALTERA¡¯s FPGA of EP3C to realize powerful processing capacity; Sampling adopted AD¡¯s AD7606 with 16 bit to ensure control accuracy of the system. The switchgear can satisfy safety requirements, and the pressure-relief channel of high voltage switch can ensure safe use of operators. Technical Parameters Series No Parameters Value 1 HVF Capacity(KVA) 250~8750kVA 2 Power of adaptive motor(KW) 200~7000KW 3 Input Frequency(Hz) 45~65Hz 4 Harmonics contents injected to power grid 0.95%(>20% of rated load) 7 Efficiency >96%(under a rated load) 8 Output frequency(Hz) 0.5~120Hz 9 Precision of output frequency 0.01Hz 10 Rated output current(A) 36~600A 11 Overload capability 120%(1min), 150%(3s), 200%(Immediate protection) 12 Control mode V/F control or Vector control 13 Analog input 0~10V/4~20mA 14 Analog output 0~10V/4~20mA Optional (2 channels) 15 Boolean input/output Communications/Default point (expandable) 16 Acc & Dec time (S) 0.1~3000s 17 Altitude

Principle APF is a new power electronic equipment which can dynamically filter harmonic with variable amplitude and frequency and compensate reactive power, it overcome the shortages of traditional LC filter and obtained the better compensation characteristics than passive filter. The following diagram is schematic diagram of APF, where, Vs is AC power supply, nonlinear load is harmonic source, it generates harmonic and consumes reactive power. APF is composed of instruction current operational circuit and compensation current generation circuit, the instruction current operational circuit is mainly to inspect current contents in harmonic current and reactive power of compensation object, and the compensation current generation circuit generates actual compensation current according to instruction current, the main circuit adopted PWM converter. Technical Features: Compensate any order harmonic with variable amplitude and frequency and different reactive power dynamically, and has a high-speed response time to the change of compensation object, it is hard to generate harmonic resonance with power grid impedance. It can implement compensation on single harmonic source and reactive power source and also implement centralized compensation on many harmonic and reactive power sources. Adopt full-bridge PWM converter to generate compensation current, the power unit is 5th generation IGBT, it is working under the high-frequency switching. Power circuit and control circuit adopted modularized structure or plug-in unit, same module can be replaced, which enhanced the reliability and maintenance. DSP high-speed checking and operation ensure harmonic checking and compensation control correct; It has intelligent supervisory control function, the working state and operation parameters are displayed in real-time, meanwhile, faults can be self-diagnosed; it also has remote communication interfaces, the real-time monitoring can be realized through PC. With perfect protection functions, the main circuit adopted three-phase three wire or three-phase four wire, it is designed to shunt APF, very easy and safe to operate. The master chip adopted latest floating-point DSP F28335 of TI Company and FPGA of ALTERA Company to make the system have powerful processing capacity, the sampling adopted AD7606 with 16 bits of AD Company to ensure control precision. APF can be used in power grid alone or can be combined with other passive filters together to realize hybrid filter with best ratio of performance to price. Application Fields: Static converters for industrial use, such as high and low voltage transducer (speed regulation), high capacity rectifier devices, etc. The DC equipment or transducer of the steel mill, high speed wire, boards and bars. Ferrous (non-ferrous) rolling (mill): Such as stainless steel rolling, carbon steel rolling, line rolling, aluminum sheet (strip, foil) rolling mill. Non-ferrous electrolysis industry: Electrolytic aluminum, copper, cadmium, cesium, etc. Rubber and plastic industry: Internal mixer, injection molding machine, extruding machine, blow molding machine etc Medium frequency induction heating furnace: Metal casting industry, steel mill hot rolling. Electrolysis of chemical plant: Electrolysis NaCl, electrolysis KCl, electrolysis H, et. Electroplating industry: Chroming, aluminizing and galvanizing in lighting factory, etc. Paper industry: Speed regulation used for craft, such as paper-pulp squeezer, etc Petrochemistry: During the technological process of chemical and oil refining, large amount of low voltage inverters used for speed regulation, and small amount of high voltage and high power electronic circuit equipments for starting, etc. DC traction equipment: Electrical railway, light rail vehicle, mine traction locomotive etc. Other high capacity industrial DC power supply. 2. AC/DC Arc Equipments AC/DC arc furnaces: Such as the Electric Arc Furnace in steel mill, etc. AC/DC arc welding machine: Automobile manufacturing, ship building, heavy machinery manufacturing, etc. 3. Power supply devices for special use High capacity uninterruptible power supply, communication power supply, high (low) frequency power supply, etc. Such as bank, hospital, semiconductor factory, program control exchange plant, remote communications, data communication station, substation, military installations, office buildings etc 4. Starting of the high capacity electromotor and switching of the high capacity reactive compensation. 5. High-precision automatic production line: The production line itself does not produce harmonic, but it is very sensitive to harmonic, so the active power filter should be installed at the side of power supply to reduce harmonic interference for production line. Wooden case (Fumigation).

Supplier: Medium voltage variable frequency converter, static var compensator, active power filter

SVR automatic feeder voltage regulator is tracking the variation in feeder voltage and changing the turn ratio of the built-in transformer, thus maintaining its output voltage within the permissible range. SVR functions satisfactorily when its input voltage fluctuates within 30% of its rating, ideal for feeder lines with large voltage drops and/or voltage fluctuations. Installed at the medium or receiving end of a feeder, SVR can effectively keep the user voltage at desired level and reduce power loss over the line. Moreover, SVR can also be applied to substations without on-load tap-changer transformers. Installed at the outgoing-line-side in such substations, SVR maintains the outlet bus voltage at specified values. SVR has been patented for its originality (Patent NO 02 2 92527.9) and received certificates as follows: Apr 2004, State Torch Program Project Dec 2004, Patent of Utility Model issued by State Intellectual Property Office(SIPO) Apr 2004, State Strongly Recommended Product 2005 Xiíªan Priority Technology Industrialization Product State Power Grid Corporation Strongly Recommended íºFour New Productí¿ for rural power networks.