Rectifier Equipment Research Articles

Experimental study on the operating characteristics of self-circulating evaporative inner cooling system for high power rectifier equipment

In the self-circulating evaporative cooling system for high power rectifier equipment, horizontal and vertical hollow copper bars constitute a complex nonlinear system. The operating characteristics of system may be affected by parallel affect. Then in this paper, experiment setup was established for one bridge according 240 kVA thyristor rectifier. Through experiment got the data of pressure and flow rate as the heat load was gradually increased. When the system work under rated condition, the temperature is lower than 80 °C. The system with composite structure shows great difference with simple structure. Then the operating characteristics was researched through a series of experiments. Meanwhile, the flow resistance of the three flow passages was studied according traditional calculation models. The homogeneous model correlation was chosen for No 1 and No 2 flow passage, and Friedel correlation was chosen for No 3 flow passage here. Results shows that the relative error is less than 25%. The work in this paper can provide guidance for optimal design of system and application in future.

Research on the Temperature Distribution of the Hollow Conductors in the Self-circulating Evaporative Inner Cooling System for High Power Rectifier Equipment

In the evaporative inner cooling system for high power rectifier equipment, the thyristor and quick fuse are both cooled double-sided via hollow conductors. Different from the previous study on the system with single structure, the self-circulating system for high power rectifier equipment has composite structure. Then the system with composite structure may show different heat transfer characteristics. So in this paper, the temperature distribution of the horizontal and vertical hollow conductors in the self-circulating system was studied through theoretical analysis and simulation.

Research on the Feasibility of the Self-circulating Evaporative Cooling System with Composites Structure for High Power Rectifier Equipment

Self-circulating evaporative cooling system is safe, effective and energy-saving. It has advantages compared with the traditional cooling technology. So it provides a new cooling method for high power rectifier equipment. Then take an example of the three-phase bridge full-controlled rectifier, a new cooling system with composite structure and non-single heat loads was proposed. Through analysis on the circulation mechanism and operation characteristics, the feasibility of the self-circulating evaporative cooling system which is composed of horizontal and vertical hollow conductor was studied in this paper.

The Implementation of Rectifier Technology For Small Scale Industries Producing Exhaust Pipe in Purbalingga

Purbalingga Regency Government policy to include exhaust pipe as one of the region's leading commodities is considered as one finest step. Various types of motor vehicle are produced and as a result small industry engaged in motor vehicle spare parts are emerging, including exhaust parts. The choice of technology with the metal industry, especially the exhaust in Purbalingga aims to improve the competitiveness of regional superior competency-based industries, namely revitalizing the industrial sector in order to exist and be able to develop, and be able to transfer technology about improving exhaust quality which has an impact on increasing the exhaust industry's income. The exhaust products from SMEs have exclusivity in the tip of exhaust pipe that is coated with metal, thus improve the appearance and quality of the exhaust. But the exhaust product with a variety of metal coated parts turned out to be incompatible with industry standards, which consequently the quality of the results of the dull metal coating process, easy to peel and rusty. For this reason, Semarang State Polytechnic implements rectifier equipment for metal coating. The methods used were the founding of an Institution Forum for the Purbalingga Exhaust Cluster Association, metal coating technique training for workers, operating tests, operational procedures and operational assistance. The results obtained are rectifiers for metal coating with current outputs of 10 A, 20 A, 30 A, 40 A, 50 A.

On‐site partial discharge test technology of converter transformer

The rectifier transformer is the power transformer of the rectifier equipment. The characteristic of the rectifier device is the AC input, DC output by rectifying the original. Converter transformer and voltage regulation transformer connect through oil and gas casing of Shanxi medium aluminium Huarun Co., Ltd. In order to solve the problems such as high test current caused by 200 kW no-load loss, insufficient capacity of single frequency conversion power supply, complicated field environment, and the great interference, a complete test plan is presented according to the conditions of the field, and the whole process of the successful test is described in detail. The key problems about the selection of test power, the selection of test frequency, and the choice of pressure mode are emphasised. The on-the-spot partial discharge test of the converter transformer has been successfully completed, which provides valuable experience for the test of large capacity transformer in the future.

Comparing and Simulation of APF Control Strategies with Time Varying Inductive Load

According to the harmonic with phase controlled rectifying technology producing applied oil deposit, this paper adopts APF (active power filter) to filter out the harmonic. The current hysteresis, triangular wave and SVPWM-three kinds of control strategies are discussed. The filter effecting of three strategies are sketched. Aiming at the drawback, it show that the strategy and method with APF based on switched linear theory. The simulation results show that the filtering effect of switched linear theory is better where harmonic is serious; the trigger angle and harmonic is small, and there is no obvious difference compared with other three strategies. Therefore Linear switches suitable for harmonic suppression, When the impedance change big and triggering angle of rectifier equipment change small.

Study on the Characteristic of Sensitive Load under Voltage Sags

In this paper, the characteristics of AC/DC converter under single-phase voltage sags and three-phase voltage sags are simulated with Matlab emulator. The simulation results show that effects on rectifier equipment under three-phase voltage sags are more serious than those under single-phase voltage sags. The flat wave capacitance plays an important role in voltage sensitivity of sensitive loads. In practice, the capacitance of flat wave capacitor is chosen according to the power supply and load requirements so as to realize the best balance of performance and price.

Basic Characteristics of New Developed Higher-Voltage Direct-Current Power-Feeding Prototype System

High efficiency power feeding systems are effective solutions for reducing the ICT power consumption with reducing power consumption of the ICT equipment and cooling systems. A higher voltage direct current (HVDC) power feeding system prototype was produced. This system is composed of a rectifier equipment, power distribution unit, batteries, and the ICT equipment. The configuration is similar to a -48 V DC power supply system. The output of the rectifier equipment is 100 kW, and the output voltage is 401.4 V This paper present the configuration of the HVDC power feeding system and discuss its basic characteristics in the prototype system.

Advances in rectifiers for battery plate formation

Modern rectifier equipments recently supplied to the industry for battery-plate formation enable manufacturers to achieve substantial energy savings and enhance the plant productivity. This article highlights recent contributions by the rectifier industry

Parallel Operation of Electrochemical Rectifiers

Electrochemical rectifier systems generally consist of two or more six-pulse units in parallel. System arrangements, regulation methods, and the number of paralleled units depend on process requirements, harmonic considerations, and economics. Fault protection of rectifier equipment must take into account contribution from the paralleled units and energy stored in the cell line.

Rectifiers for railway-traction substations

This is a general review of the present state of development of silicon rectifier equipment for the supply of d.c. for railway traction. Current general practice is described and reference is made to the latest developments, including compensators for paralleling double-bridge rectifiers, and capsule diodes.

Control theory of controlled rectifier equipment and synchronous inverter applying compound pwm system

Control theory of controlled rectifier equipment and synchronous inverter applying compound pwm system

Design and Specification Considerations for Construction of Large Industrial Rectifiers and Their Associated Facilities

Proper preparation of specifications is essential to obtain competitive bids for purchase and installation of large industrial rectifiers and associated facilities. Specification requirements for a power rectifier installation are presented. The article discusses the development of design specifications for purchase of the rectifier equipment, considerations in selection of a supplier, design of the dc bus system for connecting the rectifier to the load, and preparation of installation specifications. Also included is an example of how the computer may be used to determine optimum bus bar material. A sample problem is included.

Determination of DC Bus Fault Currents for Thyristor Converters

Maximum surge current is one of the important ratings of semiconductor rectifiers. There are several methods in the literature for calculating dc bus fault currents. These methods have largely been devoted to rectifier equipment without phase control.

Application of rectifiers to British Railways a.c. motive power

The paper deals with the various factors which influence the design of rectifier equipments used in the main propulsion power circuits for electric locomotives and multiple unit trains operating on British Railways 50Hz single-phase a.c. system. The special nature of the traction load is described, followed by an outline of the supply system and the fundamental features of the various rectifier circuits with reference to all types of rectifier devices in use, i.e. mercury-arc tanks, and germanium and silicon diodes. The important question of protection against overvoltage and overcurrent is dealt with in some detail, and the various methods of mounting and cooling the equipment are discussed. The paper ends with a survey of the operating experience which has been obtained with the various classes of motive power, highlighting the most attractive characteristics of individual types of equipments as well as those features which have led to modifications and, in some cases, conversion of complete rectifier equipments.

Silicon Rectifiers for Electric Traction Service

This paper describes the Long Island Rail Road's selection, purchase, and installation of substation 12 M, the first outdoor silicon rectifier for electric traction use in the United States. Because of the great interest at this time in rail rapid transit in the United States as well as many other countries around the world, concrete information on actual installations of this "new breed" of high-efficiency low-maintenance cost rectifier in all-outdoor housing should be of interest to many people. This information includes 1) a brief history of silicon rectifier use in electric traction systems, 2) a description of the Long Island Rail Road's electrification equipment and some typical rush-hour train loadings, 3) details of site work and field assembly for a 3000-kW outdoor silicon rectifier, 4) description of rectifier and switchgear equipment, 5) performance and maintenance experience after approximately one year's operation, 6) some general cost figures for a 3000-kW silicon recitifier station installed on Long Island, and 7) conclusions on the specific advantages of silicon rectifiers of the outdoor type for traction use.

Parallel operation of transductor-controlled silicon-rectifier equipment with waterwheel-driven d.c. generators supplying an aluminium potline

Transductor-controlled silicon-rectifier equipment has recently been commissioned in an aluminium factory in Scotland. The equipment runs in parallel with the existing Pelton waterwheel-driven d.c. generators to supply the 60?70 reduction furnaces which make up the aluminium potline. The anode effects in the potline introduce transient current and voltage fluctuations on the system. Parallel-connected transductors with voltage-feedback windings are employed to match the load sharing of the rectifier equipment with the d.c. generators, and at the same time reduce load fluctuations on the a.c. supply. In order to predict the transient performance of the equipment, the complete system was represented on an analogue computer. The subsequent tests, during the commissioning of the rectifier equipment, supported the findings of the analogue study, though no direct comparison was possible owing to the random nature of the anode effect.

Magnet power supply for the 7 GeV proton synchrotron Nimrod. Part 1: General

A 7000-ton electromagnet forms part of the 7 GeV proton synchrotron Nimrod now under construction at the Rutherford High Energy Laboratory, Harwell. The paper outlines the design of the pulsed power supply for this magnet. The derivation of the power-supply requirements is given, and possible power supply systems are reviewed briefly. The evolution of the design of the selected system, namely motor-alternator flywheel set plus a grid-controlled mercury-arc rectifier equipment, is discussed in some detail.

Proposed method of loss measurement for semiconductor rectifier equipments

IT HAS long been recognized that the efficiency of a large rectifier unit cannot be accurately determined by input-output power measurements. Errors of measurement may be as great or greater than the losses in high efficiency equipments. These errors are aggravated to an unknown degree by the distortion of current and voltage waveshapes inherent in rectifier operation.

Loss measurement in semiconductor rectifier equipment

IT HAS long been recognized that the efficiency of a large rectifier unit cannot be determined accurately by input-output power measurements. The “segregated loss” method has been written into rectifier standards because it reduces greatly the errors inherent in input — output measurements of high-efficiency equipments. However, when determining the losses of the semiconductor rectifier itself, we must take into account the difference of wave shape of the cell currents in normal operation and in the test circuit. The high incremental resistance of the cells precludes the direct equation of losses for the same average currents at different form factors.