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Electric energy metering transformer of inspection methods

Ammeter in series in order of current transformer secondary circuit, the measured current. The use of two single-phase current transformer connected in a V-shaped terminal group for the current transformer, if a transformer in which one or two reverse polarity, then the secondary current will be the synthesis of other two-phase current The √ 3 times. Figure 3 (a) below, if a reverse polarity of phase current transformer secondary is not difficult to prove at this time as a secondary synthesis of current, d +,tory burch shoes, c =. Current can be measured in the field = √ 3 Si. Braid (a) v-shaped wiring a class of reverse phase (b) Y-shaped phase reverse polarity when wiring diagram C 3 reversed-polarity current transformer secondary wiring diagram and phase diagram for the use of three Y-shaped single-phase current transformer current transformer connection group for which a current transformer if the reverse polarity, then synthesized the neutral current will be twice the current of other phases. Figure 3 (b) below, after the synthesis of neutral current for the =, d + a, c, for a, c =, d + Si it is: a 2Ic. If all the current transformer polarity reversed, relying on the current problems can not find it, then just make a chart to analyze the amount of power appearances in order to make the right judgments, not repeat them here. (3) to determine the correct current transformer grounding method is to use a current meter, current meter,tory burch, a measurement of the ground terminals, the measurement terminals of the lead with another power meter, respectively, and each phase of the current terminals. If the phase terminal grounded, the ammeter does not indicate, and the speed meter is not affected at this time; if not ground the terminal of the phase ammeter with instructions, and the speed meter at this time will be affected and change. 3 Conclusion For the operation of the transformer, when the electric wiring inspection can not determine the accuracy or live test results need further verification, you should also check the power outage. Check the contents include: transformer turns ratio and polarity; three-phase voltage transformer connection group; second connection terminals, and other signs of reconciliation,ugg stivali, transformer turns ratio and polarity at the factory or before use testing and inspection should be carried out, in the absence of special need (such as the occurrence of doubt, the original logo blurred or lost the original records, etc.), generally the check can be omitted. Must be noted that the case charged back to the road work in the transformer secondary should pay attention to safety, comply with the necessary safe system of work and operational procedures. Special attention should be at work the following two points: (1) open circuit current transformer secondary is not allowed, otherwise, it will in the current transformer secondary windings induces a very high (up to several kV) electric potential, on the safety of persons and equipment cause great harm; (2) does not allow the voltage transformer secondary circuit, otherwise, various protection device will malfunction, bring very serious consequences. References [1] compiled by the Bureau of Shanxi Electric Power Industry. Electrical measuring instrument. China Electric Power Press. 1998 Author: Cui Guangwen, male, managers, and chemical equipment engineer. Company: Pingdingshan salt Opteron limited liability company power plant. Address: 467 ~ 01 light Pingdingshan City, middle of the road. Shiguang Li, Chen, Du,ugg boots billig, Pingdingshan towel salt Opteron limited liability company (Pingdingshan 467CO1). Received :2005-04-14 (Continued from page 35) position is still in its practical value have finished school, need to be installed after the demolition of the rotor, should be well marked on the parts removed in order to in situ installation. Not yet completed all the rotating body of the rotor assembly should be installed in the missing parts of the quality of the location of installation of the equivalent weight block, the implementation of the balance. Large imbalance Remedy: ① correct balance should be selected with the actual working conditions as much as possible the same position or the position of the workpiece shaft as a supporting point for balancing adjustment when the supporting position. ② bearings and other components will be installed and then balance the rotor, the overall balance. ( Cool

The rotor is equipped with components associated with the speed or in a certain speed of the rotor moment of inertia change the balance of the workpiece can be ① If the rotor is equipped with a variable moment of inertia of the components, such as: conical-speed, motor rotor The speed relay and other components, it should be fixed rebalancing. ② When surviving a processing chip surface, or oxide welding scars, whether from the balance of quality and safety, should be eliminated. ③ If the imbalance is large workpiece itself, there are two methods to choose from: a. First use of low-speed balance or static balance method, after the removal of a considerable amount of unbalance, then the requirements of the original balance of speed and accurate balance. b. Monomer balance the rotor first,ugg milano, then the overall balance. ④ on the balance of speed, it should be balanced in the position. About the author: Weng Huiyan. Women. Research Institute. Work unit; Zhejiang Ocean University College of Engineering. Address: 316 004 105 Wenhua Road, Zhoushan Dinghai Road. Received Time :2005 -04-19

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