ugg stivali 110kV straight down regulating auto tr

110kV straight down regulating auto transformer type power supply of electrolytic rectifier

Insurance. One is to stop transmission when the rectifier regulating auto transformer neutral point to ground; the other is in the structure as far as possible the main, one modulation, or main,[link widoczny dla zalogowanych], modulation was put in a fuel tank to minimize Lord, modulation occurs between the end of the second line of single-phase ground short circuit. (3) current measurement and protection of the sensitivity of regulating auto transformer when used in combination with the rectifier transformer, because the process may be at different voltage level regulator can not rely solely on network side of the current transformer secondary accurately reflect the actual rectifier transformer load current, so the actual use from time to time in the main, installed between the modulation current transformer. When the rectifier transformer constituted by two groups of 12 single pulse (the dual core), especially once the necessary changes in the two rectifier side current transformers were installed. For the rejection of its following - �� a. Accurate measurement of transformer rectifier load current; b. Rectifier transformer primary current to take back to the auto-flow system for control purposes; * 50 * Light Metals 1998 �� 12C. In the low voltage transformer output voltage, when the three-phase rectifier transformer secondary short circuit occurs, reflected in the network side of the fault current may be small, but rejected due to insufficient sensitivity of action. Guchang in the modulation of secondary (ie, a rectifier changes) to enhance the protection of the installation of protective sensitivity and reliability. Such an approach to the single 12-pulse rectifier is particularly important. 3.4 The structure of the transformer rectifier regulating auto and configuration based on the basic characteristics of auto regulator, auto voltage regulator rectifier transformer during the structure and configuration of the design should consider the following points: (1) give priority to primary , adjusting one program;. (2) If the Lord should not be used, adjusting one time,[link widoczny dla zalogowanych], we should try to shorten the main, the distance between the modulation and the connection bus to add guards; (3) of the auto voltage transformer and rectifier transformer composed of single 12-pulse rectifier design, give priority to products font configuration. To facilitate the valve side of the bus connection. More than 3.5 units in parallel operation and Phase (1) multiple units operating in parallel and the equivalent number of electrolytic dc pulse load, and concentrated, to power the rectifier often require multiple parallel operation, usually 3 ~ 4. Aluminum for large rectifier DC load is the main power grid harmonic source. Therefore, the design is required during the rectifier operating in parallel on multiple phase rectifier unit to form an equivalent for multiphase systems. On the one hand can improve the quality of the DC power supply; the other hand, can inhibit the generation of high harmonics. The equivalent single pulse number and the number of composition is as follows pulse: a. Single pulse number P = 6; N a unit number of the total pulse P�� = NX6b. Single pulse number P = 12; N a unit number of the total pulse P2 = NX12 (2) regulating auto transformer rectifier phase a. Regulating auto transformer rectifier phase modulation phase shift can also be a phase change in the rectifier; b. Phase approach to the star for many twists and turns, the specific manner in which equipment manufacturers should be together with the Design Institute of the specific circumstances of different projects as mutually agreed. 4l10kV regulating auto transformer rectifier Study and Improvement of a. EHV power system is generally large ground current system. Therefore 110kV EHV straight down and over regulating auto rectifier type, often come across rectifier transformer primary and secondary windings are Y connected situation, and the normal operation of rectifier Neutral, so the potential three-phase harmonic components may be larger. b. Auto voltage regulator on the line side rectifier,[link widoczny dla zalogowanych], rectifier transformer winding neutral point of a star is a star with the auto neutral with leads, or suspended? On this issue is currently no unified regulations. Usually leads to a common ground, respectively, as well. c. Single pulse of 12, Y0 auto, Y0 / ��. Y0 / Y connection of the rectifier unit in person, in a project timed relay protection rectifier, when the check valve side of the three-phase rectifier transformer short-circuit sensitivity,[link widoczny dla zalogowanych], the emergence of Yo / Y system group of the sensitive system to meet the requirements; Yo / A Sensitivity coefficient system group does not meet the requirements +. Because, phase, line current exists 1 / 3 of the relationship, it should be in engineering design for this problem, check in advance and protect the sensitivity of change through the rational matching rectifier transformer primary current (protection winding) the transformation ratio. Can use different variables when necessary to improve the protection of more than sensitivity. References 1 Cui Lijun, eds. Theory and design of special transformers. Scientific and Technical Documents Publishing House. 19952 Repentance Bin Liu, eds. The power rectifier design. Metallurgical Industry Press. 19823 Published by iron and steel enterprises Power Design Manual. Metallurgical Industry Press. 19954 Northwest Electric Power Design Institute,[link widoczny dla zalogowanych], ed. Electrical Engineering Design Manual. Shanghai Science and Technology Press. 1982 Received :1998-01-08. Welcome to the dog testifies to the user account _ Journal of Soil zero advertisements bird

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