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Testing Power Electronics-por-eng-Rev000.pptx
1.
Created by: Bruno
Menezes Translated by: Adam Sheppard – 2012-11-12 Testing Power Electronics
2.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Index Power Electronics in Use Diodes Thyristor IGBT Bridge Rectifier
3.
© Copyright ENERCON
GmbH. All rights reserved. Filename: WARNING • Follow “ Safety instructions for work in and around WECs”. BA_bl_1001 Health and safety regulations (Work at and on ENERCON WECs ger-eng)
4.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Power Semiconducting Devices Integrated Modules Discrete Devices
5.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Diode The diode is a unidirectional component ie only conducts in one direction (when the anode is at a positive potential with respect to cathode). A diode when forward biased PN junction conducts because in the neutral zone or depletion zone (zone without electrical charge carriers) close the electrical resistance decreases and the electric current passes.
6.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Diode The verification of semiconductor PN junction can be done with the multimeter. This type of test is to verify whether diodes have their normal characteristics. + -
7.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Diode To perform measurements on the components is important that the component is not in circuit, the measurement of components in the circuit can be misleading, because in addition to measuring the component values are measured in conjunction with all components connected to the component. _ A K + Forward Bias: Reversed Bias A K + _ R (Good) R Or (Open Circuit) R = in Silicon or ~100 K in Germanium R (Diode is Defective) + -
8.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Diode
9.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Diode Power Diode
10.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Diodes – Applications Excitation Cabinet (Protection) Power Cabinets (Bypass) Yaw Inverter Cabinet (Bridge Rectifier) …
11.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Thyrister To check a thyrister, we can connect a multi-meter on PN junctions of the thyrister and the results should be an infinite resistance. The orientation of the leads do not matter because the gate has not been triggered. R = The thyristor will conduct current from the anode to the cathode when given a pulse at the gate of sufficient duration and current.
12.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Thyrister If we measure the resistance between the gate and the anode the result should be infinite (or close enough to it). The orientation of the leads does not matter here. R = 25 MOhms
13.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Thyrister We can make a approximate confirmation of the gate by applying a test identical to the gate and cathode terminals. If we apply a forward bias (positive gate and cathode negative) indicated by the multimeter the resistance should be low. If instead inversely polarize (Gate negative and positive cathode) resistance indicated by the multimeter should be high. R (bom) ~ 7 Ohm Forward Bias: Reversed Bias: R (bom) ~ 7 Ohm
14.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Thyristor
15.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Thyristor Use the following technique with a multimeter to test the PN ( ) junction on the thyristor. First, connect the positive lead to the anode and the negative lead to the cathode. Then place a wire short-circuiting the gate terminal with the anode. This should result in the resistance going from a high value, to a very low value when the short is applied.
16.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Thyristor Even after the short between the gate and the anode has been removed the resistance between the anode and cathode should remain small (close to 0Ω) If a lead has been removed from either the anode or cathode, and then reapplied. The resistance will be that of an open circuit.
17.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Thyristor Modules Thyristor
18.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Thyristor - Applications Rectifier …
19.
© Copyright ENERCON
GmbH. All rights reserved. Filename: IGBT - Isolated Gate Bipolar Transistor. IGBT is an acronym for Isolated Gate Bipolar Transistor An IGBT is half FET (Field Effect Transistor – for the control input) and half bipolar power transistor (for a switch). The IGBTs combine the advantages of both components and therefore can be used to control power devices, and is mainly found in industrial applications. IGBTs are mainly used in industrial machines, power inverters, and other high powered machines. They work well in situation where it is required to control high currents and voltage. IGBTs will always be mounted on heat sinks.
20.
© Copyright ENERCON
GmbH. All rights reserved. Filename: +(3) - (2) ~(1) upper switch 2UA ~ (1) C2 E1 + (3) C1 - (2) E G2 lower switch 3UA ~ (1) + (3) - (2) Gat e IGBT E2G2 IGBT - Isolated Gate Bipolar Transistor.
21.
© Copyright ENERCON
GmbH. All rights reserved. Filename: +(3) - (2) ~(1) IGBT - Isolated Gate Bipolar Transistor. Test with a multimeter The resistance between the gate and the other terminals must be very high. Same for the resistance between the Emitter and Collector. R R G2 Emitter Collecter Gate
22.
© Copyright ENERCON
GmbH. All rights reserved. Filename: IGBT - Isolated Gate Bipolar Transistor.
23.
© Copyright ENERCON
GmbH. All rights reserved. Filename: The PCBs are responsible for converting the optical signal from the inverter control to an electrical signal. The PCBs are monitored by the inverter control PCB L1 + L1 - DC link Output The PCB is also monitoring the temperatures of the IGBTs. The temperature sensor is between the IGBTs. Each PCB controls two driving IGBTs. IGBT - Isolated Gate Bipolar Transistor.
24.
© Copyright ENERCON
GmbH. All rights reserved. Filename: IGBT - Isolated Gate Bipolar Transistor. IGBT Modules
25.
© Copyright ENERCON
GmbH. All rights reserved. Filename: IGBT - Isolated Gate Bipolar Transistor - Applications Excitation Circuit ( Rotor Excitation Control) Power Cabinet (Inverter) Yaw Inverter Cabinet (Inverter) Box Pitch (Pitch Motor Control) …
26.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Bridge Rectifier IGBT Transistor Module Three Phase Rectifier Module Temperature Sensor Terminal Links Fan E40 Excitation Module Three Phase Rectifier Module
27.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Bridge Rectifier Testing with a mutlimeter Attach the positive lead on the negative terminal (-) and slide the black lead to each terminal of rectifier (~). The resistance measured should be very high. + - ~ ~ ~
28.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Bridge Rectifier Testing with a Multimeter Attach the black lead on the positive terminal and then touch the red lead to the input terminals of the rectifier. Once again, the resistance should be very high. + - ~ ~ ~
29.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Bridge Rectifier
30.
© Copyright ENERCON
GmbH. All rights reserved. Filename: Bridge Rectifier - Applications Excitation Circuit – Rotor Excitation Box Pitch (Adjustment – Power Pitch Motors) Pitch Power Board (Adjustment – Pitch Brakes Power) Yaw Motors (Adjustment – Motor Brake Power) …
31.
© Copyright ENERCON
GmbH. All rights reserved. Filename: 31 Imprint Publisher: ENERCON GmbH ▪ Dreekamp 5 ▪ 26605 Aurich ▪ Germany Phone: +49 4941-927-0 ▪ Fax: +49 4941-927-109 Copyright: © ENERCON GmbH. Any reproduction, distribution and utilisation of this document as well as the communication of its contents to third parties without express authorisation is prohibited. Violators will be held liable for monetary damages. All rights reserved in the event of the grant of a patent, utility model or design. Content subject to change: ENERCON GmbH reserves the right to change, improve and expand this document and the subject matter described herein at any time without prior notice.
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