US2798571A - Saturable reactor control - Google Patents

Saturable reactor control Download PDF

Info

Publication number
US2798571A
US2798571A US364364A US36436453A US2798571A US 2798571 A US2798571 A US 2798571A US 364364 A US364364 A US 364364A US 36436453 A US36436453 A US 36436453A US 2798571 A US2798571 A US 2798571A
Authority
US
United States
Prior art keywords
transformer
voltage
saturable core
impedance device
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
US364364A
Inventor
Schaelchlin Walter
Jr Charlton H Storey
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 Corp
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 Corp filed Critical Westinghouse Electric Corp
Priority to US364364A priority Critical patent/US2798571A/en
Priority to JP3456155U priority patent/JPS3114338Y1/ja
Application granted granted Critical
Publication of US2798571A publication Critical patent/US2798571A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • G05F1/32—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using magnetic devices having a controllable degree of saturation as final control devices
    • G05F1/33—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using magnetic devices having a controllable degree of saturation as final control devices with plural windings through which current to be controlled is conducted

Definitions

  • This invention relates to electrical control apparatus for eliminating a system fault current and returning the system to normal voltage within a relatively short time interval.
  • the invention relates to a control system of the type referred to which utilizes a saturable core impedance device.
  • the invention is broadly applicable to apparatus for eliminating a system fault current and returning the system to normal voltage, it is illustrated here as applied to precipitators for removing ionized particles from a contaminated atmosphere.
  • precipitators for removing ionized particles from a contaminated atmosphere.
  • An example being the Cottrell type precipitator for removing particles from the exhaust stacks of industrial plants.
  • Precipitators of the type contemplated present a capacitive load and are subject to arc-over between elements.
  • the control must extinguish the arc in the precipitator and return the precipitator voltage to its normal value as quickly as possible.
  • One object of this invention is to provide control apparatus for extinguishing or eliminating a system fault current.
  • Another object of this invention is to provide control apparatus for extinguishing or eliminating a system fault current and restoring normal voltage to the system after the fault current has been extinguished or eliminated.
  • a specific object of this invention is to provide a control system for an electrostatic precipitator wherebyany arc-over between elements is automatically eliminated and normal voltage restored to the system.
  • ballast rheostat in series with the primary of the transformer which supplies the voltage for the precipitators so as to keep the fault current at a reasonable value and to adjust the transformer voltage to a value close to the breakdown point of the precipitator in order to insure a maximum operating efficiency of precipitation.
  • the system has a fast speed of response because there is no time delay in the ballast rheostat.
  • a special ventilating system is required to dissipate the heat caused by these losses, and the voltage adjustment by meansof the rheostat is'rather coarse because of the limited number of steps.
  • a further specific object of this invention is to provide a control system of the type referred to which utilizes a saturable core impedance device and has positive arc extinguishing characteristics with a relatively fast response, high efficiency, and low loss for restoring a normal voltage to the precipitator after an arcover.
  • an electrostatic precipitator is designed by the numeral 1 and is shown as having a pipe 2 through which the treated material flows and a bus 3 in the center of the pipe comprising the elements which receive the direct current ionizing voltage.
  • the relatively high direct current ionizing voltage for the electrostatic precipitator 1 is supplied from the positive and negative terminals 4 and 5 of the full-wave rectifier 6.
  • the alternating current terminals 7 and it of the rectifier 6 are connected to the output terminals of the secondary S of the transformer 9.
  • the primary winding P of the transformer 9 has voltage adjusting taps at one end connected to one line Ll of an alternating current supply through the voltage adjusting arm ill.
  • the opposite side of the primary P of the transformer h is connected to the opposite line L2 of the alternating current source through series connected windings l1 and 12 of a saturable core reactor 13.
  • the rectifier 6 is shown as the dry type rectifier but other type rectifiers which are capable of supplying the necessary ionizing voltage to the electrostatic precipitator 1 may be used.
  • the saturable core reactor 13 has a control winding 14 which receives a direct current voltage from the output terminals 15 and 16 of a full-wave rectifier 17.
  • a voltage adjusting potentiometer ifi is connected in series with the control winding M.
  • the input terminals 19 and 20 of the rectifier i7 are supplied from a magnetic amplifier 21 of the self-saturating type having main windings 22 and 23 and saturating rectifiers 24 and 25.
  • the main windings 22 and 23 of the magnetic amplifier 21 are supplied from a variable voltage autotransformer 26 which is connected across the secondary of the transformer 27.
  • the primary of the transformer 27 is connected directly across the lines L1 and L2 which supply an alternating current voltage.
  • the magnetic amplifier 21 has a bias winding 28 connected in series with a voltage adjusting potentiometer 29 across the output terminals 39 and 31 of rectifier 32 connected in full-bridge arrangement.
  • the input terminals 33 and 34 of the rectifiers 32 in full-bridge arrangement are also connected across the secondary of the transformer 27.
  • the bias winding 28 saturates the core of the magnetic amplifier 21.
  • the magnitude of the voltage applied to the bias winding 28 is such that it will result in the necessary current into the control winding 14 of the saturable core reactor 13, so that the main windings 11 and 12 thereof will present the desired circuit impedance.
  • a control winding 35 is provided for the magnetic amplifier 21 and is connected in series With a resistor 36 across the output terminals 37 and 38 of rectifiers 39 in full-bridge arrangement.
  • the resistor 36 is introduced to reduce the time delay of the magnetic amplifier.
  • the rectifiers 39 have their input terminals 4% and 41 connected to be supplied from the secondary of the current transformer 42 so that the control winding 35 of the magnetic amplifier 21 will receive a signal determined by the current which flows through the primary P of the transformer 9.
  • the control winding 35 is wound on the core of the magnetic amplifier 21 in such a manner that its flux opposes that caused by the bias winding 28 and therefore the effect of the control winding 35 is to desaturate the core of the magnetic amplifier 21.
  • variable voltage autotransformer 26 is provided to permit fine adjustment of the voltage on the precipitator 1 by means of changing the voltage supply on the main windings 22 and 23 of the magnetic amplifier 21 to thus change the currents applied to the control winding 14 of saturable reactor 13 and vary saturation of its cores and hence impedance of its main windings 11 and 12. Varying the impedance presented by the main windings 11 and 12 varies the voltage on the primary P of the transformer 9 and thus the voltage applied to the elements 2 and 3 of the precipitator 1.
  • the voltage across the primary P of the transformer 9 is decreased to the extent that the arc in precipitator 1 is extinguished.
  • the bias winding 28 of the magnetic amplifier 21 will again determine the degree of saturation of the core and the primary P of transformer 9 will be restored to normal and hence the voltage between the elements 2 and 3 of the precipitator 1 will be restored to normal.
  • Electrical control apparatus comprising the combination of a transformer having a primary and a secondary, rectifying means connected to said secondary to supply a direct current voltage, a capacitive load connected to said rectifying means to receive said direct current voltage, a first saturable core impedance device having its main windings connected between an alternating current source and the transformer primary, a control winding for said first saturable core impedance device, a second saturable core impedance device connected to energize said control winding of said first saturable core impedance device, winding circuit means for said second saturable core impedance device connected to saturate said second saturable core impedance device, and control winding means for said second saturable core impedance device responsive to transformer current and connected to desaturate said second saturable core impedance device to reduce the output thereof upon the occurrence of transformer current of a given value.
  • Electrical control apparatus comprising, the combination of a transformer having a primary and a secondary, rectifying means connected to said secondary to supply a direct current voltage, a capacitive load connected to said rectifying means to receive said direct current voltage, a first saturable core impedance device having its main windings connected between an alternating current source and the transformer primary, a control winding for said first saturable core impedance device, a second saturable core impedance device having an output circuit connected to energized said control winding of said first saturable core impedance device, a bias winding for said second saturable core impedance device, means for applying a bias voltage to said bias winding, said bias winding being wound to provide a saturating flux, a control winding for said second saturable core impedance device, and means responsive to the rate of change of transformer current for energizing said last named control winding in a sense to produce a saturating flux in said second saturable core impedance device
  • Electrical control apparatus comprising, the combination of a transformer having a primary and a secondary, rectifying means connected to said secondary to supply a direct current voltage, a capacitive load connected to said rectifying means to receive said direct current voltage, a saturable core impedance device having its main windings connected between an alternating current source and the transformer primary, a control winding for said saturable core impedance device, a magnetic amplifier of the self-saturating type having an output circuit connected to energize said control winding of said saturable core impedance device, a bias winding circuit for said magnetic amplifier connected to bias said magnetic amplifier toward maximum output, a control winding on said magnetic amplifier disposed to drive said magnetic amplifier toward minimum output, and means responsive to transformer current for energizing said control winding of said magnetic amplifier.
  • Electrical control apparatus comprising the combination of a transformer having a primary and a secondary, rectifying means connected to said secondary to supply a direct current voltage, a capacitive load connected to said rectifying means to receive said direct current voltage, a saturable core impedance device having its main windings connected between an alternating current source and the transformer primary, a control winding for said saturable core impedance device, a magnetic amplifier of the self-saturating type having an output circuit connected to energize said control winding of said saturable core impedance device, a bias winding for said magnetic amplifier, circuit means connected to said bias winding to energize said bias Winding, said bias winding being wound to provide a saturating flux, a control winding for said magnetic amplifier wound to oppose said bias winding, and circuit means connecting said control winding with said primary of said transformer to be energized in dependence of a primary current surge to de-saturate the core of the magnetic amplifier.
  • Control apparatus for an electrostatic precipitator comprising, a transformer having a primary circuit and a secondary circuit, rectifiers connected to the transformer secondary circuit to supply the electrostatic precipitator with a direct current voltage, an alternating current circuit connected to energize said primary circuit of said transformer, a saturable core impedance device having a pair of main windings connected in series with each other and the transformer primary, a control winding for said saturable core impedance device, a magnetic amplifier of the self-saturating type having an output circuit connected to energize said control winding of said saturable core impedance device, a bias winding for said magnetic amplifier, circuit means connected to energize said bias winding, said bias winding being wound to provide a saturating flux driving said magnetic amplifier toward maximum output, and a control winding for said magnetic amplifier connected to said primary circuit of said transformer to be responsive to a system current surge, said control winding being wound in a sense to desaturate the core of the magnetic amplifier and drive said magnetic amplifier toward minimum output.
  • Electrical control apparatus comprising, the combination of a transformer having a primary circuit and a secondary circuit, rectifying means connectedto said secondary circuit. to supply a direct current voltage, an electrostatic precipitator connected to said rectifying means to receive said direct current voltage, an alternating 5 current circuit Connected to energize said primary circuit of said transformer, a first saturable core impedance device having its main windings connected in series with said transformer primary circuit, a control winding for said first saturable core impedance device, a second saturable core impedance device having an output circuit connected to energize said control winding of said first saturable core impedance device, a bias winding circuit for said second saturable core impedance device for driving said second saturable core impedance device toward maximum output, a control Winding circuit for a said second saturable core impedance device for driving said 6 second saturable core impedance device toward minimurri output, and circuit means responsive to transformer current surges for energizing said control winding

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)
  • Electrostatic Separation (AREA)

Description

July 9, 1957 w. SCHAELCHLIN ETAL 2,798,571
SATURABLEI REACTOR CONTROL Filed June 26, 1953 WITNESSES: INVENTORS Wol'ler Schoelchlin 8 9% choregon H. Storey,
ATTORNEY United States atent sATnnAsLE REACTOR coNrRot Walter Schaelchlin and (Jharlton H. Storey, Jr., Buffalo, N. Y., assignors to Westinghouse Electric tlorporation, East Pittsburgh, Pa, a corporation of Pennsylvania Application June 26, 1953, Serial No. 364,364
r? Ciaims. (Cl. 183-4) This invention relates to electrical control apparatus for eliminating a system fault current and returning the system to normal voltage within a relatively short time interval. In more particular, the invention relates to a control system of the type referred to which utilizes a saturable core impedance device.
Although the invention is broadly applicable to apparatus for eliminating a system fault current and returning the system to normal voltage, it is illustrated here as applied to precipitators for removing ionized particles from a contaminated atmosphere. An example being the Cottrell type precipitator for removing particles from the exhaust stacks of industrial plants.
Precipitators of the type contemplated present a capacitive load and are subject to arc-over between elements. The control must extinguish the arc in the precipitator and return the precipitator voltage to its normal value as quickly as possible.
One object of this invention is to provide control apparatus for extinguishing or eliminating a system fault current.
Another object of this invention is to provide control apparatus for extinguishing or eliminating a system fault current and restoring normal voltage to the system after the fault current has been extinguished or eliminated.
A specific object of this invention is to provide a control system for an electrostatic precipitator wherebyany arc-over between elements is automatically eliminated and normal voltage restored to the system.
Many control systems for precipitators utilize a ballast rheostat in series with the primary of the transformer which supplies the voltage for the precipitators so as to keep the fault current at a reasonable value and to adjust the transformer voltage to a value close to the breakdown point of the precipitator in order to insure a maximum operating efficiency of precipitation. The system has a fast speed of response because there is no time delay in the ballast rheostat. However, it has a poor operating efficiency because of the loss in the rheostat, a special ventilating system is required to dissipate the heat caused by these losses, and the voltage adjustment by meansof the rheostat is'rather coarse because of the limited number of steps.
Accordingly, a further specific object of this invention is to provide a control system of the type referred to which utilizes a saturable core impedance device and has positive arc extinguishing characteristics with a relatively fast response, high efficiency, and low loss for restoring a normal voltage to the precipitator after an arcover.
The objects stated are merely illustrative. Still other objects and advantages will become apparent from a study of the following specification and the accompanying drawing. The single figure shows diagrammatically a circuit embodying the invention.
With specific reference to the form of the invention illustrated an electrostatic precipitator is designed by the numeral 1 and is shown as having a pipe 2 through which the treated material flows and a bus 3 in the center of the pipe comprising the elements which receive the direct current ionizing voltage. The relatively high direct current ionizing voltage for the electrostatic precipitator 1 is supplied from the positive and negative terminals 4 and 5 of the full-wave rectifier 6. The alternating current terminals 7 and it of the rectifier 6 are connected to the output terminals of the secondary S of the transformer 9. The primary winding P of the transformer 9 has voltage adjusting taps at one end connected to one line Ll of an alternating current supply through the voltage adjusting arm ill. The opposite side of the primary P of the transformer h is connected to the opposite line L2 of the alternating current source through series connected windings l1 and 12 of a saturable core reactor 13. The rectifier 6 is shown as the dry type rectifier but other type rectifiers which are capable of supplying the necessary ionizing voltage to the electrostatic precipitator 1 may be used.
The saturable core reactor 13 has a control winding 14 which receives a direct current voltage from the output terminals 15 and 16 of a full-wave rectifier 17. A voltage adjusting potentiometer ifi is connected in series with the control winding M. The input terminals 19 and 20 of the rectifier i7 are supplied from a magnetic amplifier 21 of the self-saturating type having main windings 22 and 23 and saturating rectifiers 24 and 25. The main windings 22 and 23 of the magnetic amplifier 21 are supplied from a variable voltage autotransformer 26 which is connected across the secondary of the transformer 27. The primary of the transformer 27 .is connected directly across the lines L1 and L2 which supply an alternating current voltage.
The magnetic amplifier 21 has a bias winding 28 connected in series with a voltage adjusting potentiometer 29 across the output terminals 39 and 31 of rectifier 32 connected in full-bridge arrangement. The input terminals 33 and 34 of the rectifiers 32 in full-bridge arrangement are also connected across the secondary of the transformer 27. In the embodiment illustrated, the bias winding 28 saturates the core of the magnetic amplifier 21. The magnitude of the voltage applied to the bias winding 28 is such that it will result in the necessary current into the control winding 14 of the saturable core reactor 13, so that the main windings 11 and 12 thereof will present the desired circuit impedance. A control winding 35 is provided for the magnetic amplifier 21 and is connected in series With a resistor 36 across the output terminals 37 and 38 of rectifiers 39 in full-bridge arrangement. The resistor 36 is introduced to reduce the time delay of the magnetic amplifier. The rectifiers 39 have their input terminals 4% and 41 connected to be supplied from the secondary of the current transformer 42 so that the control winding 35 of the magnetic amplifier 21 will receive a signal determined by the current which flows through the primary P of the transformer 9. The control winding 35 is wound on the core of the magnetic amplifier 21 in such a manner that its flux opposes that caused by the bias winding 28 and therefore the effect of the control winding 35 is to desaturate the core of the magnetic amplifier 21.
For normal operation the voltage on the bias winding 28 of the magnetic amplifier 21 is such that it tends to saturate the core of the magnetic amplifier and give a desired current in the control winding 14 of the saturable core reactor 13. The current in the control winding 14 of the saturable core reactor 13 is such that the saturable reactor is reasonably well saturated. The variable voltage autotransformer 26 is provided to permit fine adjustment of the voltage on the precipitator 1 by means of changing the voltage supply on the main windings 22 and 23 of the magnetic amplifier 21 to thus change the currents applied to the control winding 14 of saturable reactor 13 and vary saturation of its cores and hence impedance of its main windings 11 and 12. Varying the impedance presented by the main windings 11 and 12 varies the voltage on the primary P of the transformer 9 and thus the voltage applied to the elements 2 and 3 of the precipitator 1.
In case of a fault current or an arc-over between the elements 2 and 3 of the precipitator 1, a current surge will occur in the circuit of the primary P of the transformer 9 as well as in the circuit of the secondary S. The current surge in the circuit of the primary P of transformer 9 will cause an immediate and corresponding rise in the secondary output of the current transformer {12 to the control winding 35 of the magnetic amplifier 21 The control winding ampere turns then will predominate to desaturate the magnetic amplifier and thereby reduce the current of the control coil 14 of the saturable core reactor which in turn increases the impedance presented by its main windings 11 and 12. As soon as the'impedance of the main windings l1 and 12 of the saturable core reactor is increased, the voltage across the primary P of the transformer 9 is decreased to the extent that the arc in precipitator 1 is extinguished. When the arc in the precipitator 1 is extinguished the entire system current will decrease. The bias winding 28 of the magnetic amplifier 21 will again determine the degree of saturation of the core and the primary P of transformer 9 will be restored to normal and hence the voltage between the elements 2 and 3 of the precipitator 1 will be restored to normal.
It will be recognized that the objects of the invention have been achieved by providing a control apparatus utilizing saturable core impedance devices to extinguish or eliminate a system fault current and restore normal operating voltage to the system very rapidly. It will also be recognized that the system utilized has a high operating efficiency.
While in accordance with the patent statutes, one best known embodiment of the invention has been illustrated and described in detail, it is to be particularly understood that the invention is not limited thereto or thereby but that equivalents are clearly within the inventive scope.
We claim as our invention:
1. Electrical control apparatus comprising the combination of a transformer having a primary and a secondary, rectifying means connected to said secondary to supply a direct current voltage, a capacitive load connected to said rectifying means to receive said direct current voltage, a first saturable core impedance device having its main windings connected between an alternating current source and the transformer primary, a control winding for said first saturable core impedance device, a second saturable core impedance device connected to energize said control winding of said first saturable core impedance device, winding circuit means for said second saturable core impedance device connected to saturate said second saturable core impedance device, and control winding means for said second saturable core impedance device responsive to transformer current and connected to desaturate said second saturable core impedance device to reduce the output thereof upon the occurrence of transformer current of a given value.
2. Electrical control apparatus comprising, the combination of a transformer having a primary and a secondary, rectifying means connected to said secondary to supply a direct current voltage, a capacitive load connected to said rectifying means to receive said direct current voltage, a first saturable core impedance device having its main windings connected between an alternating current source and the transformer primary, a control winding for said first saturable core impedance device, a second saturable core impedance device having an output circuit connected to energized said control winding of said first saturable core impedance device, a bias winding for said second saturable core impedance device, means for applying a bias voltage to said bias winding, said bias winding being wound to provide a saturating flux, a control winding for said second saturable core impedance device, and means responsive to the rate of change of transformer current for energizing said last named control winding in a sense to produce a saturating flux in said second saturable core impedance device.
3. Electrical control apparatus comprising, the combination of a transformer having a primary and a secondary, rectifying means connected to said secondary to supply a direct current voltage, a capacitive load connected to said rectifying means to receive said direct current voltage, a saturable core impedance device having its main windings connected between an alternating current source and the transformer primary, a control winding for said saturable core impedance device, a magnetic amplifier of the self-saturating type having an output circuit connected to energize said control winding of said saturable core impedance device, a bias winding circuit for said magnetic amplifier connected to bias said magnetic amplifier toward maximum output, a control winding on said magnetic amplifier disposed to drive said magnetic amplifier toward minimum output, and means responsive to transformer current for energizing said control winding of said magnetic amplifier.
4. Electrical control apparatus comprising the combination of a transformer having a primary and a secondary, rectifying means connected to said secondary to supply a direct current voltage, a capacitive load connected to said rectifying means to receive said direct current voltage, a saturable core impedance device having its main windings connected between an alternating current source and the transformer primary, a control winding for said saturable core impedance device, a magnetic amplifier of the self-saturating type having an output circuit connected to energize said control winding of said saturable core impedance device, a bias winding for said magnetic amplifier, circuit means connected to said bias winding to energize said bias Winding, said bias winding being wound to provide a saturating flux, a control winding for said magnetic amplifier wound to oppose said bias winding, and circuit means connecting said control winding with said primary of said transformer to be energized in dependence of a primary current surge to de-saturate the core of the magnetic amplifier.
5. Control apparatus for an electrostatic precipitator comprising, a transformer having a primary circuit and a secondary circuit, rectifiers connected to the transformer secondary circuit to supply the electrostatic precipitator with a direct current voltage, an alternating current circuit connected to energize said primary circuit of said transformer, a saturable core impedance device having a pair of main windings connected in series with each other and the transformer primary, a control winding for said saturable core impedance device, a magnetic amplifier of the self-saturating type having an output circuit connected to energize said control winding of said saturable core impedance device, a bias winding for said magnetic amplifier, circuit means connected to energize said bias winding, said bias winding being wound to provide a saturating flux driving said magnetic amplifier toward maximum output, and a control winding for said magnetic amplifier connected to said primary circuit of said transformer to be responsive to a system current surge, said control winding being wound in a sense to desaturate the core of the magnetic amplifier and drive said magnetic amplifier toward minimum output.
6. Electrical control apparatus comprising, the combination of a transformer having a primary circuit and a secondary circuit, rectifying means connectedto said secondary circuit. to supply a direct current voltage, an electrostatic precipitator connected to said rectifying means to receive said direct current voltage, an alternating 5 current circuit Connected to energize said primary circuit of said transformer, a first saturable core impedance device having its main windings connected in series with said transformer primary circuit, a control winding for said first saturable core impedance device, a second saturable core impedance device having an output circuit connected to energize said control winding of said first saturable core impedance device, a bias winding circuit for said second saturable core impedance device for driving said second saturable core impedance device toward maximum output, a control Winding circuit for a said second saturable core impedance device for driving said 6 second saturable core impedance device toward minimurri output, and circuit means responsive to transformer current surges for energizing said control winding of said second saturable core impedance device.
References Cited in the file of this patent UNITED STATES PATENTS 2,084,870 Schmidt June 22, 1937 2,549,782 Engelman Apr. 24, 1951 2,573,255 Forssell Oct. 30, 1951 2,617,973 Wolf J12, et a1 Nov. 11, 1952
US364364A 1953-06-26 1953-06-26 Saturable reactor control Expired - Lifetime US2798571A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US364364A US2798571A (en) 1953-06-26 1953-06-26 Saturable reactor control
JP3456155U JPS3114338Y1 (en) 1953-06-26 1954-09-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US364364A US2798571A (en) 1953-06-26 1953-06-26 Saturable reactor control

Publications (1)

Publication Number Publication Date
US2798571A true US2798571A (en) 1957-07-09

Family

ID=23434179

Family Applications (1)

Application Number Title Priority Date Filing Date
US364364A Expired - Lifetime US2798571A (en) 1953-06-26 1953-06-26 Saturable reactor control

Country Status (2)

Country Link
US (1) US2798571A (en)
JP (1) JPS3114338Y1 (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2897914A (en) * 1955-02-16 1959-08-04 United States Steel Corp Control system for electrostatic precipitation
US2925142A (en) * 1953-12-07 1960-02-16 Koppers Co Inc Electrical precipitator
US2943697A (en) * 1957-07-22 1960-07-05 Joy Mfg Co Automatic field strength control for precipitators
US2978065A (en) * 1957-07-03 1961-04-04 Svenska Flaektfabriken Ab Regulating electric precipitators
US2994027A (en) * 1957-04-17 1961-07-25 Vickers Inc Power transmission
US3034060A (en) * 1958-04-02 1962-05-08 Western Electric Co Keyer circuit using rectified cut-off bias
US3045170A (en) * 1959-01-15 1962-07-17 Lorain Prod Corp Regulated rectifier
US3049848A (en) * 1953-08-17 1962-08-21 Apra Precipitator Corp Electrostatic precipitator circuits
US3059394A (en) * 1959-09-08 1962-10-23 Koppers Co Inc Electrostatic precipitator
US3079542A (en) * 1960-03-29 1963-02-26 North Electric Co Current supply apparatus
US3268798A (en) * 1962-04-27 1966-08-23 Superior Electric Co Adjustable voltage control circuit
US3271931A (en) * 1965-01-29 1966-09-13 Detroit Edison Co Automatic control for fly ash precipitators
US3376473A (en) * 1964-07-23 1968-04-02 Matsushita Electric Ind Co Ltd Automatic arc welders
DE1295527B (en) * 1963-09-14 1969-05-22 Koch & Sterzel Wandler Und Tra Electrostatic precipitator
US3504479A (en) * 1967-03-29 1970-04-07 Everett L Coe Jr Precipitator control apparatus
US3641740A (en) * 1969-07-09 1972-02-15 Belco Pollution Control Corp Pulse-operated electrostatic precipitator
US3936721A (en) * 1972-11-16 1976-02-03 Weir Electronics Limited Electrical power supplies

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2084870A (en) * 1935-10-10 1937-06-22 Gen Electric System of electrical distribution
US2549782A (en) * 1945-08-06 1951-04-24 Standard Telephones Cables Ltd Voltage regulator
US2573255A (en) * 1942-06-16 1951-10-30 Asea Ab Means for reproducing a direct current
US2617973A (en) * 1950-08-12 1952-11-11 Jr John L Wolff Regulating system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2084870A (en) * 1935-10-10 1937-06-22 Gen Electric System of electrical distribution
US2573255A (en) * 1942-06-16 1951-10-30 Asea Ab Means for reproducing a direct current
US2549782A (en) * 1945-08-06 1951-04-24 Standard Telephones Cables Ltd Voltage regulator
US2617973A (en) * 1950-08-12 1952-11-11 Jr John L Wolff Regulating system

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3049848A (en) * 1953-08-17 1962-08-21 Apra Precipitator Corp Electrostatic precipitator circuits
US2925142A (en) * 1953-12-07 1960-02-16 Koppers Co Inc Electrical precipitator
US2897914A (en) * 1955-02-16 1959-08-04 United States Steel Corp Control system for electrostatic precipitation
US2994027A (en) * 1957-04-17 1961-07-25 Vickers Inc Power transmission
US2978065A (en) * 1957-07-03 1961-04-04 Svenska Flaektfabriken Ab Regulating electric precipitators
US2943697A (en) * 1957-07-22 1960-07-05 Joy Mfg Co Automatic field strength control for precipitators
US3034060A (en) * 1958-04-02 1962-05-08 Western Electric Co Keyer circuit using rectified cut-off bias
US3045170A (en) * 1959-01-15 1962-07-17 Lorain Prod Corp Regulated rectifier
US3059394A (en) * 1959-09-08 1962-10-23 Koppers Co Inc Electrostatic precipitator
US3079542A (en) * 1960-03-29 1963-02-26 North Electric Co Current supply apparatus
US3268798A (en) * 1962-04-27 1966-08-23 Superior Electric Co Adjustable voltage control circuit
DE1295527B (en) * 1963-09-14 1969-05-22 Koch & Sterzel Wandler Und Tra Electrostatic precipitator
US3376473A (en) * 1964-07-23 1968-04-02 Matsushita Electric Ind Co Ltd Automatic arc welders
US3271931A (en) * 1965-01-29 1966-09-13 Detroit Edison Co Automatic control for fly ash precipitators
US3504479A (en) * 1967-03-29 1970-04-07 Everett L Coe Jr Precipitator control apparatus
US3641740A (en) * 1969-07-09 1972-02-15 Belco Pollution Control Corp Pulse-operated electrostatic precipitator
US3936721A (en) * 1972-11-16 1976-02-03 Weir Electronics Limited Electrical power supplies

Also Published As

Publication number Publication date
JPS3114338Y1 (en) 1956-09-03

Similar Documents

Publication Publication Date Title
US2798571A (en) Saturable reactor control
GB788366A (en) Improvements in and relating to electric arc machining apparatus
US2757297A (en) Time delay devices
US3147094A (en) Control system for electrical precipitators
US2742104A (en) Automatic voltage control of electrostatic precipitator with saturable reactor
US2549782A (en) Voltage regulator
US2617973A (en) Regulating system
US2432399A (en) Electrical control device
US1730254A (en) Control system
US2568391A (en) Regulating system
US2953741A (en) Magnetic amplifiers
US2802166A (en) Regulators
US2721968A (en) Motor control system
US2010600A (en) Precipitator
US2015534A (en) Filter system for mercury-arc rectifiers
US2697802A (en) Control for gaseous discharge devices
US2773134A (en) Magnetic amplifiers
US2752554A (en) Control apparatus for dynamo-electric machines
US2500189A (en) Saturable magnetic shunt controller
US2953740A (en) Load-controlled magnetic amplifier circuit
US2937321A (en) Current limiting in the windings of electromagnetic devices
US2777021A (en) Parallel connected magnetic amplifier
US2476805A (en) Regulating system for synchronous condensers
US2222696A (en) Protective system
US1893766A (en) Electric translation circuits