AKH-0.66 series current transformer

AKH-0.66 series current transformer 1 Overview AKH-0.66 series current transformer shell is made of flame-retardant, it imported 140 ℃ temperature polycarbonate injection molding, cold-rolled silicon steel core orientation using tape winding from the secondary leads and High intensity electromagnetic wire, product structure, handsome in appearance, easy installation, small size, light weight, high accuracy, large capacity. Products meet the national standard GB1208-2006 equivalent IEC60044-1: 2003. 2 Technical Specifications ◆ measuring CT primary current 5-6300A, secondary current 5A, 1A, 0.1A, 0.05A; protection CT primary current 5-6300A, secondary current 5A, 1A, 0.1A, 0.05A; double winding CT primary Current 5-6300A, secondary current 5A, 20mA, 1A, 20mA; double winding sensor primary current 5-6300A, secondary current AC5A, DC4-20mA, AC1A, DC4-20mA; residual current CT primary current 0-5A, two times the output current 5mA, 2mA or voltage 1V; three-phase current transformer primary current 5-200A, secondary current 5A, 1A, 50mA, 20mA; micro-current transformer primary current 5-100A, secondary current 5A, 1A, 50mA , 20mA; metering CT primary current 5-2000A, secondary current 5A, 1A; opening ceremony CT primary current 20-6300A, secondary current 5A, 1A. ◆ rated working voltage AC0.66kV (equivalent AC0.69kV, GB156-2003) ◆ rated frequency 50 ~ 60Hz ◆ Ambient temperature -30 ℃ ~ 70 ℃ maximum temperature of 120 ℃ ◆ Altitude ≤3000m ◆ frequency withstand voltage 3000V / 1min 50Hz ◆ no rain for a direct invasion of thunder, no serious pollution and severe vibration place 3 Selection Help ◆ select the corresponding specifications of the product according to the parameters of the primary current and bus-section and so on. A wire through the transformer aperture. Open the flip, the secondary wiring through the pressure-ray, led after the second terminal flip reset. Power measurement can be directly used flip hole sealed stereotype to tamper. ◆ operating current long-term rating of not more than 1.1 times, allowing the use of 1.2 times the rated short time, no more than 1h; ◆ according to the measured current size, select the rated current ratio, generally used is larger than the measured current 2/3 around the rated current; ◆ product polarity is expressed as: a wiring signs P1, P2, corresponding secondary wiring signs S1, S2; S1 represents the dot end of P1, S2 represents the end P2 of the same name; ◆ measuring instruments connected to S1, S2 the end, when the connected circuit should not exceed the total load transformer rated load, when the installation location and current transformer meter far away or circuit load is large, should be preferred secondary current 1A specifications; ◆ Note Depending on the size and the number of busbars, the choice of the window size to match the transformer. Model main characteristics Remarks AKH-0.66-Ⅰ apply to (single) multiple cables or single busbar applicable across a wide range, specifications AKH-0.66-Ⅱ apply to a plurality of busbars (1-6 root) or more cables through widely applicable, specifications AKH-0.66-Ⅲ with type Ⅰ, Ⅱ features, meet the power measurement of high precision, large capacity requirements for a wide face, specifications AKH-0.66-M8 is suitable for small current, small space places for Wiring type CT, is particularly suitable for the requirements of small drawers, capacity 2.5VA AKH-0.66-P applied to the plurality of busbars, vertical installation, and supporting the use of line protection relay with AKH-0.66-S Dual output, one for ammeter measurement, display, another way for the system to monitor the current collection widely applicable, specifications AKH-0.66-SM dual-output, all the way to measure AC current, another output DC 4-20mA for remote, can and controlled with the use of instruments such as PLC, cost savings for users, the auxiliary power supply provided by the PLC DC24V suitable for system monitoring AKH-0.66-L for residual current acquisition, monitoring and control devices and electrical, motor protection device supporting the use of a wide range of applications, specifications AKH-0.66-G for electricity metering, accuracy up to 0.2S, wide measurement range, accurate measurement, specifications for power supply bureau LQZJ-0.66 metering, accuracy class of 0.2S, capacity 10VA, measurement precision , in conjunction with the charge meter direct AKH-0.66-K for the reconstruction project, demolition without a bus, easy installation, users can save manpower and financial resources, enhance the efficiency of the transformation suitable for distribution system improvement projects AKH-0.66-Z with in a small space distribution cabinets, range 5-200A three-phase one AKH-0.66-W multi-circuit monitoring for the communications room, and AMC16 with the use of cost savings for the user applies to Appendix Data Centre / communications room power distribution system of mutual inductance selection of the rated capacity should be greater than the load impedance transformers using the debugging process, when there is feedback: "ammeter indicates a large deviation from the actual current value", and then wonder "Transformers quality problems", exactly the reason: "Design Selection of rated capacity is too small, the total load impedance is greater than the rated capacity, real non-quality problems caused by transformers "for the sake of clarity, is an example: a power distribution devices, such as on-site or central two measurements and measurement, wire cross-section 2.5 mm2, distance 70m, should be used in the transformer rated capacity will be different (ignoring the contact resistance). Appendix 2 between electrical measurement and measuring instruments and measuring instrument transformers Accuracy class configuration generally voltmeter, ammeter, power meter accuracy class 1.5 to 2.5; frequency table 0.5; shunt connection with the instrument, the additional resistance, power transmission to 0.5. Phase transformer accuracy class configuration, if only for the voltage and current measurement, generally not less than 1, non-critical loop meter (2.5), you can use three; if used in combination, should not be less than the loop inside the instrument highest accuracy class. Appendix 3 Why recommend use of specifications for the 1A current transformer GB GB 1208-2006 "current transformer" as specified in Section 5.2, rated secondary current standard value of 1A and 5A, the priority value 5A. When a large transmission distance, 1A and 5A has a number of advantages compared to: line power reduction, power lines and through the current proportional to the square of the transformer secondary current 5A 1A reduce power consumption as compared to 25 times that 1A, 5A power consumption is only 4%. 1A in the design of the system, generally only calculate impedance and Instrumentation (ignoring the contact resistance) transmission distance increases, the current transformer secondary load computer formula S = I2Z, in the same load , the secondary current is 1A transformer transmission distance is 25 times. 5A, it can avoid the election 5 / 1A intermediate transformer or use large-capacity transformers. Wire cross section reduction: medium-sized factories, when the meter and transformer installation distance (for example 80m), can be seen from Table 2, was elected with 5A, 10VA transformer, surface calculated need 8mm2, such as the selection 1A, 2.5VA transformers, line section only 1.5mm2. With the current popularity and the development of computer numerical control instruments, rated secondary current is 1A and the following specifications of the current transformer selection has been more common.