[go: up one dir, main page]

US2285691A - Switching device - Google Patents

Switching device Download PDF

Info

Publication number
US2285691A
US2285691A US367104A US36710440A US2285691A US 2285691 A US2285691 A US 2285691A US 367104 A US367104 A US 367104A US 36710440 A US36710440 A US 36710440A US 2285691 A US2285691 A US 2285691A
Authority
US
United States
Prior art keywords
current
choke
core
parallel
winding
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 - Lifetime
Application number
US367104A
Other languages
English (en)
Inventor
Wegener Johannes
Zuhlke Marcel
Koppelmann Floris
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.)
CBS Corp
Original Assignee
Westinghouse Electric and Manufacturing Co
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 Westinghouse Electric and Manufacturing Co filed Critical Westinghouse Electric and Manufacturing Co
Application granted granted Critical
Publication of US2285691A publication Critical patent/US2285691A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/20—Contact mechanisms of dynamic converters
    • H02M1/26—Contact mechanisms of dynamic converters incorporating cam-operated contacts

Definitions

  • This invention relates toan improvement in a switching device for breaking and making a circuit with a condenser in parallel connection to the breaking point, a choke being series-connected to the condenser in the current path in parallel connection to the breaking point, the magnet core of which choke is saturated when passing a current in predetermined direction and of predetermined intensity and desaturates when the passing current exceeds a certain value in the reverse direction, for instance, for the purpose of passing freely the charging current flowing to the parallel condenser when opening the breaking point, but to oppose temporarily a substantially increased resistance to the condenser current being discharged when closing the breaking point so that the discharging current may not cause dangerous spark when closing.
  • Figs. 1 and 2 show single-phase wiring diagrams of the fundamental arrangement as well as of a modification and Fig. 3 the wiring diagram of a multi-phase converter arrangement.
  • a switching arrangement for breaking a direct or alternating current has two stationary contacts H, II and a movable bridge contact i2 which may be separated when opening.
  • the parallel current path comprises, for instance, two equal condensers I 4, l4, two equal ohmic resistances l5, l5 and a saturation choke I6 whose magnet core I! consists preferably of a high grade iron material. Its magnetization characteristic should be inclined in the unsaturated range as little as possible towards the flux axis, present a sharp bend at the points when passing into the saturated ranges and run nearly parallel to the axis of the magnetic energization at as high as possible a saturation induction in the saturated ranges.
  • the core I"! is,
  • a choke I8 with a magnetic core l9 may be provided outside the parallel current path in series-connection with the switch arrangement, which magnetic core also consists of a high-grade iron material and is highly saturated at rated current but desaturates abruptly at each breaking operation near the zero value of the passing current so that a current weak pause occurs during which the breaking may take place under facilitated conditions.
  • a premagnetization winding !3 may be arranged which is supplied with direct or alternating current and may serve for the additional control of the desired magnetization state of the choke as well as for controlling purposes.
  • threephase current may be converted into direct current or vice versa, in which case one pole of the direct-current side is formed by the star point of the secondary winding of the three-phase transformer, whereas the three switching arrangements at the side away from the transformer form the second direct-current pole.
  • Fig. 2 shows, for instance, a phase of a multiphase Graetz-system, one main line coming from an alternating-current system being led to two alternately operating switching arrangements of which the one carries the positive and the other the negative half waves.
  • Fig. 1 there are those of Fig. 2 viz. the stationary contacts 4
  • the winding of the switching choke I8 is subdivided in this case in two parallel legs to obtain a good insulation and a small leakage.
  • the cores I1 and 41 are also interlinked with the choke l8. Therefore particular premagnetization devices may under circumstances be dispensed with.
  • the coils l6 and 46 have the same direction of winding and nearly the same number of turns as the coil [8.
  • the transition to the unsaturated state is effected during the locking time either by current vibrations forming in the parallel current path owing to a suitable tuning thereof or by an additional premagnetization of the cores [1, 41 which, however, must have now another value than the above-mentioned premagnetization during opening.
  • This may, for instance, be accomplished by supplying the premagnetization winding with an auxiliary alternating voltage of suitable frequency and phase position.
  • Fig. 3 shows a transformer arrangement for the alternate exchange of energy between a three-phase network 10 and a direct current network with six contact arrangements 1 to 6 arranged in Graetz-connection and which are alternately closed and opened in succession.
  • the contact arrangements I and 2 are just being closed. As soon as the contact arrangement 3 has closed the contact arrangement I etc.
  • the chokes l6 and 46, 26 and 56, 36 and 66 are there arranged on one only core I1, 21 or 31 which is also interlinked with the winding of a choke I8, 28, 38 which has besides only one own core I9, 29, 39.
  • the desired magnetization state of the various magnetic cores may be obtained also in this case according to the directions shown in Figs. 1 and 2 by a suitable selection of the number of turns, tuning of the parallel current paths and eventually by an additional premagnetization of the various cores.
  • the parallel chokes of several branching switches connected to the same supply line may in general be arranged on a common magnet core.
  • a switching device comprising a contactor, a protective circuit in shunt with said contactor, said protective circuit including an impedance, a capacitor and a reactor connected in series circuit relation and a saturable core in said reactor and means for premagnetizing said saturable core whereby current flow in one direction through said reactor tends to saturate said core and current flow in the opposite direction tends to desaturate said core.
  • a switching device comprising a contactor, a. protective circuit in shunt with said contactor, said protective circuit including an impedance, a capacitor and a reactor connected in series circuit relation and a saturable core in said reactor, a second reactor in series circuit arrangement with said contactor, a second saturable core in said second reactor, said second reactor being linked with both said first and second saturable cores.
  • a switching device for periodically making and breaking a circuit comprising a contactor including two stationary contacts and a movable bridge contact, a resistor and a capacitor connected in series with each of said stationary contacts, a reactor winding connecting said resistors and capacitors in shunt with said contactor, a tap in said reactor winding, means for connecting said tap to said movable bridge and a saturable core in said reactor winding.
  • a switching device for periodically making and breaking a circuit comprising a contactor including two stationary contacts and a movable bridge contact, a resistor and a capacitor connected in series with each of said stationary contacts, a reactor winding connecting said resistors and capacitors in shunt with said contactor, a tap in said reactor winding, means for connecting said tap to said movable bridge and a saturable core in said reactor winding, a second reactor winding connected in series circuit relation with said contactor, a saturable core in said second reactor winding, said second reactor winding linking both said saturable cores.
  • a switching device for periodically making and breaking a circuit comprising a contactor including two stationary contacts and a movable bridge contact, a resistor and a capacitor connected in series with each of said stationary contacts, a reactor winding connecting said resistors and capacitors in shunt with said contactor, a tap in said reactor winding, means for connecting said tap to said movable bridge and a saturable core in said reactor winding, a second winding linked with said saturable core for controlling the saturating characteristics thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Ac-Ac Conversion (AREA)
US367104A 1939-11-26 1940-11-25 Switching device Expired - Lifetime US2285691A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES8362D DE916433C (de) 1939-11-26 1939-11-26 Schalteinrichtung

Publications (1)

Publication Number Publication Date
US2285691A true US2285691A (en) 1942-06-09

Family

ID=7472755

Family Applications (1)

Application Number Title Priority Date Filing Date
US367104A Expired - Lifetime US2285691A (en) 1939-11-26 1940-11-25 Switching device

Country Status (4)

Country Link
US (1) US2285691A (de)
CH (1) CH217070A (de)
DE (1) DE916433C (de)
FR (1) FR868057A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470825A (en) * 1945-04-10 1949-05-24 Bell Telephone Labor Inc Electrical contact protection network
US2610231A (en) * 1949-09-10 1952-09-09 Fkg Fritz Kesselring Geratebau Synchronous electric current switching apparatus
US2617974A (en) * 1948-04-15 1952-11-11 Fkg Fritz Kesselring Geratebau Electric converting apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470825A (en) * 1945-04-10 1949-05-24 Bell Telephone Labor Inc Electrical contact protection network
US2617974A (en) * 1948-04-15 1952-11-11 Fkg Fritz Kesselring Geratebau Electric converting apparatus
US2610231A (en) * 1949-09-10 1952-09-09 Fkg Fritz Kesselring Geratebau Synchronous electric current switching apparatus

Also Published As

Publication number Publication date
FR868057A (fr) 1941-12-15
CH217070A (de) 1941-09-30
DE916433C (de) 1954-08-09

Similar Documents

Publication Publication Date Title
US2285691A (en) Switching device
CN103840729A (zh) 无触点有载自动调压配电变压器的启动与过渡支路
US2374974A (en) Electric circuit
US2292829A (en) Transformer
US2434503A (en) Tap changing system
US2227984A (en) Regulator circuit
US2225644A (en) Method and apparatus for putting into operation a multiphase converting device
US490178A (en) Electric-circuit breaker
US2415653A (en) Electrical-frequency responsive relay circuit
US2421300A (en) Transformer circuit
US1537927A (en) Transformer
US2358631A (en) Transformer circuit
US2231721A (en) Electrical induction apparatus
US1804614A (en) Tap changing system
US2196029A (en) Electric circuit
US2366679A (en) Electric circuit
US1961801A (en) Transformer voltage regulating system
US2476077A (en) Transformer system
US1764319A (en) Voltage-control system
US2440983A (en) Tapped transformer system
US1975176A (en) Tap changing system
US2693569A (en) Commutating reactor
US926243A (en) System of electric-circuit control.
US1761732A (en) Transformer
US1870272A (en) Alternating current motor