TRIOL KN24+ VOLTAGE COMPENSATORS Dear Customers! KN24+ voltage compensators will help you cut financial and process losses due to unreliable power supply of your enterprises. Triol Corporation has offices in several countries, 3 production facilities and 9 product service centres. We are engaged in development and production of industrial gadgets and are proud of our solutions. We highly appreciate our Partners and Customers and are always open to co-operation! PURPOSE KN24+ voltage compensator is designed to improve the quality of essential power supply voltage by eliminating voltage surges and dips on the three-phase voltage curves. KN24+ is a dual energy converter with inputs connected to the supply system and outputs to the consumer s loads. Where necessary, KN24+ allows direct supply of the consumer s loads from a 0.4 kw system. KN24+ power circuit is based on IGBT-converters (voltage inverters), specialized booster transformer, high-speed thyristor switch, energy storage devices with charging units, and has a high-performance microprocessor control system. KN24+: Provides reliable continuous power supply to consumers in emergency and abnormal electric mains modes. Eliminates phase asymmetry in a standard consumer supply mode. Maintains the nominal voltage on the load side for 1 second in case of supply voltage failure, providing for reliable transfer of a backup power to the supply net. The voltage compensator is shown in the figure below. KN24+ is a cabinet-type device. Note The KN24 modification is provided without energy storage cabinets.
Components KN24+ voltage compensator is a Set of cabinets, which consists of functional components as follows: 1.Control cabinet...1 pc. The cabinet includes: Removable Control panel...2 pcs. UPS...1 pc. Battery unit...1 pc. Auxiliary transformer...1 pc. Control system...1 pc. 2..Transformer cabinet...1 pc. The cabinet includes: Multifunction power transformer...1 pc..thyristor switch boxes...9 pcs..automatic switch...1 pc. Three-pole knife Circuit breakers...1 pc. Control system...1 pc..cooling fan...1 pc. 3..Lead-in cabinet...1 pc. The cabinet includes: DC link charging system...1 pc..three-pole knife Circuit breakers...2 pcs. Power contactor...1 pc. Cabinet control system...1 pc. 4..Power cell cabinet...1 pc. The cabinet includes: Inverter cell...2 pcs. Rectifier with active front endcell...1 pc..sine filter reactors...3 pcs..cabinet control system...1 pc. Cooling fan...1 pc. 5..Storage capacitor cabinet...2 pcs. The cabinet includes: Capacitor Capaitor batteries sells...10 pcs..capacitor batteries charging system...1 pc. Cabinet control system...1 pc..cooling fan...1 pc.
Components Functional designation of cabinets: 1. Control cabinet 2. Transformer cabinet 3. Lead-in cabinet 4. Power cell cabinet 5, 6. Storage capacitor cabinet. KN24+ inverter part is implemented as pull-out IGBT power cells. Multifunction inverter/rectifier power cell,
Technical characteristics KN24+ intended purpose Parameter Efficiency in Standby mode, min. % 99,7 Efficiency in KN mode, min. % Efficiency in UPS mode, min. % 68,2 Value Ensuring reliable continuous power supply to consumer ±10 % 99; ±30 % 98; ±50 % 96. Supply voltage (line), V 380, 480, 690 Supply voltage deviation, % ±30, ±50 Supply voltage unavailable, s 1, 2, 3 Supply frequency, Hz 50, 60 Load capacity, kw Max deviation of the output voltage, % ±1 Failure (overvoltage) response time, max. ms 2 Time to voltage compensation to the minimum value, max. ms 75, 110, 160, 200, 250, 320, 400, 500, 630, 800 8 Output voltage, V 380, 480, 690* Switching frequency, Hz 2 Physical interface Communication protocol Overheating of power semiconductor elements, software protection Software protection Cooling method IP rating Communication in standard configuration Protection Cooling Operating conditions RS485 Modbus RTU; Profibus DP Emergency shutdown of KN24+ at excess target temperature of power semiconductor elements, bypass switching Bypass switching in the event of output short-circuit failure Forced air IP20 Height above sea level, max. m 1000 Operating ambient temperature, С +1 to +40 (no condensation) Humidity 80 % @ +20 С * The value is set by the customer.
Operating aspects and operating modes High reliability due to connection of the switching thyristor equipment and devices based on IGBTmodules on different sides of a specialized transformer. Short KN24+ start-up time due to self-test of current and voltage measuring channels, analysis of microprocessor control and communication devices, checks of controllability and actuation of power switching and semiconductor devices. Redundant auxiliary power supply voltage provided by a three-phase input from the Customer s supply net and input from three-phase KN24+ output voltage as control voltage, with an auxiliary UPS for a main controller. Unique efficient software algorithms allowing flexible reconfiguration of KN24+ based on the condition of supply voltage and the Consumer s loads. KN24+ operating modes: - Test mode - Standby mode - Voltage Compensation mode - UPS mode Removable control panel featuring unique induction energizer technology. Multiple line control panel enables simultaneous display of several parameters. Text indication of error messages. KN24+ cabinet s layout and components are based on the Customer s load capacity. Simplified schematic of KN24+ compensator power circuit QF ТК1 ТК2 Mains Сеть ~380 В ТК3 Load Нагрузка ~380 В U*a,b,c Ud Заряд charge Ud KM1 Т KM2 Ud Uc Заряд charge Uс QS3
Basic functions. Test mode Test mode ensures quick comprehensive check of all KN24+ components during commissioning. Main circuit details as given below show the stages of KN24+ test in the Test mode, as follows: QF circuit breaker quick - ON/OFF-operating check. ON/OFF check of the three-phase TK1 thyristor switch operating along with the QF circuit breaker. ON/OFF check of the three-phase TK3 thyristor switch with transformer T boost winding of a. Functional check of input active front end, Ud capacitor link and Uc supercapacitor link charging units. Functional check of input active front end rectifier, two output voltage inverters and three-phase TK2 thyristor switch acting as a switch between transformer T boost and load windings. In most cases KM2 switch with ballast resistors acts as a load. Mains Сеть ~380 В QF KM2 ТК1 Mains Сеть ~380 В KM2 Mains Сеть ~380 В ТК3 Т KM2
Basic functions. Test mode Mains Сеть ~380 В Ud Заряд Uc charge Uс Заряд Ud charge Ud ТК2 Mains Сеть ~380 VВ KM1 Т KM2 Ud
Basic functions. Standby mode In this mode, energy consumption is minimized to brining efficiency of the unit to above 99 %. KN24+ performs continuous monitoring of input voltage and checks input voltage value against the target voltage threshold. If input voltage value is outside the tolerable limit of ±10 % of the rated value, voltage compensation mode is enabled. If mains voltage is outside the tolerable limit of ±30 % of the rated value, UPS mode is enabled. QF Mains Сеть ~380 VВ ТК3 Load Нагрузка ~380VВ U*a,b,c KM1 Т Ud Uc Заряд charge Uс
Basic functions. VC Voltage compensation mode In this mode, the compensator continuously monitors input voltage and checks its value against the target voltage threshold. In case of deviations, the IGBT converter group generates dynamic differential voltages to be transferred by transformer T to the three-phase boost winding. In this mode KN24+ maintains the rated voltage at load side with a tolerance not exceeding 1 % of the rated value. Mains Сеть ~380VВ ТК3 Нагрузка Load ~380 VВ U*a,b,c KM1 Т Ud Uc Заряд charge Uс Graphs to illustrating KN24+ operation in the VC mode are given below. Uin Uout Umult Umult t1 ~ (1 14) ms transformer starting time t2 ~ 20 ms QF1 circuit breaker switch-off time t3 input voltage failure time t4 standby time
Basic functions. UPS mode In most cases, supply voltage reduction for 30 % of the rated value or more is associated with an abnormal situation preceding complete input shutdown at the delivery point. Depending on the specific site features, this provision may not be fulfilled. Therefore, one of the stages of KN24+ start-up includes a process study and analysis of site power quality, with subsequent adjustment of KN24+ operation algorithms to the conditions of the actual facility. When switching to the UPS mode from VC mode, in the absence of input voltage, KN24+ disconnects the active rectifier from the mains input, reconnects the load and boost transformer windings and switches power storage device based on supercapacitors into operation. Voltage inverters based on IGBT transistors maintain the rated voltage on KN24+ load side within 1 s, which allows extra time for reliable transition of the loads to the standby circuit. ТК2 0 Нагрузка Load ~380 VВ U*a,b,c Ud Т Uc Graphs to explain KN24+ operation in the UPS mode are given below. Uin Uout Umult t1 6.7 ms thyristor switching time for transformer reconnection t2 13 ms transformer time t3 20 ms QF1 circuit breaker switch-off time t4 1 s voltage absence time t5 60 ms synchronization time t6 15 μs thyristor bypass switching time
Appendix. Dimensions
For notes