GB1369448A - Device for relieving voltage unbalance - Google Patents

Device for relieving voltage unbalance

Info

Publication number
GB1369448A
GB1369448A GB5115271A GB5115271A GB1369448A GB 1369448 A GB1369448 A GB 1369448A GB 5115271 A GB5115271 A GB 5115271A GB 5115271 A GB5115271 A GB 5115271A GB 1369448 A GB1369448 A GB 1369448A
Authority
GB
United Kingdom
Prior art keywords
windings
nov
voltage unbalance
core
primary windings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB5115271A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of GB1369448A publication Critical patent/GB1369448A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • G05F1/12—Regulating voltage or current  wherein the variable actually regulated by the final control device is AC

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

1369448 Transformers HITACHI Ltd 3 Nov 1971 [11 Nov 1970] 51152/71 Heading HIT [Also in Division H2] A device for use in a voltage-control system comprises a three-part core F 1 , F 2 , F 3 , Fig. 2, for coupling primary windings A 1 , B 1 , C 1 (one for each phase) to secondary windings A 2 , -, C 4 arranged in three series connected groups (A 2 , B 3 , C 4 ), (B 2 , C 3 , A 4 ), (C 2 , A 3 , B 4 ) having respective outputs AA, BB, CC, each set of windings (e.g. A 1 , A 2 , A 3 , A 4 ) having a turns-ratio of 1:1:2:2. If the input voltage V to one of the primary windings (say A) is reduced by a factor Z, (so that the inputs are V(1-Z), V, V) then with the above arrangement the output voltages will be from which it follows that the input fractional error (B - A/A) is much greater than the output error (BB - AA/AA). The core may be a threelegged one as shown in Fig. 5a, and with or without an additional free leg FF (Fig. 5b, not shown).
GB5115271A 1970-11-11 1971-11-03 Device for relieving voltage unbalance Expired GB1369448A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45098731A JPS5114132B1 (en) 1970-11-11 1970-11-11

Publications (1)

Publication Number Publication Date
GB1369448A true GB1369448A (en) 1974-10-09

Family

ID=14227648

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5115271A Expired GB1369448A (en) 1970-11-11 1971-11-03 Device for relieving voltage unbalance

Country Status (3)

Country Link
JP (1) JPS5114132B1 (en)
DE (1) DE2155903C3 (en)
GB (1) GB1369448A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994027357A1 (en) * 1993-05-11 1994-11-24 Swichtec Power Systems Limited A power converter with star configured modules

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH061413B2 (en) * 1987-07-16 1994-01-05 ニシム電子工業株式会社 Ferro-resonant transformer for three-phase constant voltage
SE503518C2 (en) * 1995-04-28 1996-07-01 Martin Lundmark Symmetrical devices with Z-coupled windings
JP5026029B2 (en) * 2006-08-30 2012-09-12 陽三 飯田 Current balancer and low voltage distribution system
FR2989213B1 (en) * 2012-04-06 2014-05-02 Hispano Suiza Sa THREE-PHASE DIPHASE FIXED TRANSFORMER WITH FORCES FLUX
JP7155072B2 (en) 2019-06-28 2022-10-18 株式会社クボタ Hydraulic system of working machine and working machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994027357A1 (en) * 1993-05-11 1994-11-24 Swichtec Power Systems Limited A power converter with star configured modules

Also Published As

Publication number Publication date
DE2155903A1 (en) 1972-05-31
DE2155903B2 (en) 1975-03-13
JPS5114132B1 (en) 1976-05-07
DE2155903C3 (en) 1975-10-23

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees