DE1588423C

DE1588423C - Power supply device, in particular for protective relays

Info

Publication number: DE1588423C
Authority: DE
Inventors: Hubert 5628 Heihgenhaus Rollecke
Original assignee: Hartmann and Braun AG
Current assignee: ABB Training Center GmbH and Co KG
Publication date: 1972-12-07

Description

der Z-Diode4 gebildet wird. Durch diese Schaltung wird die über die Klemmen 1, 2 zugeführte Betriebsspannung CZ₁ stabilisiert. Die stabilisierte Spannung U» liegt an den Klemmen 7, 8. Zwischen der Basis des Transistors 9 und einer Klemme der Z-Diode 4 ist in gleicher Weise wie bei dem Beispiel nach Fig. 1 die Basis-Emitter-Strecke des Transistors5 geschaltet. Der Kollektor des Transistors 5 ist über einen Widerstand mit einer Versorgungsleitung verbunden. Außerdem ist der Kollektor über eine Diode 11 mit dem Eingang der Auslösestufe 6 verbunden. Die Auslösestufe 6 wird von der stabilisierten Betriesspannung £/., gespeist. Über die Klemme 12 wird der Auslösestufe ein Eingangssignal zugeführt. Die Wirkungsweise der Schaltung nach Fig. 2 entspricht weitgehend derjenigen der Schaltung nach Fig. 1. Ebenfalls wird bei zu kleiner Spannung U₁ der Transistors zugesteuert. Damit sinkt dann jedoch die am Widerstand 10 im normalen Betrieb anstehende Spannung ab, womit der Eingang der Auslösestufe 6 kurzgeschlossen wird. Ein über die Klemme 12 zugeführtes Signal kann dann die Auslösestufeö nicht mehr betätigen. An Stelle der Auslösestufe 6 ist auch eine andere Schaltung denkbar. Die Verbindungsleitung zwischen dem Kollektor des Transistors 5 und der Auslösestufe 6 ist für den Regelungsvorgang unwichtig.the Z-Diode4 is formed. _{The operating voltage CZ 1} supplied via the terminals 1, 2 is stabilized by this circuit. The stabilized voltage U » is applied to the terminals 7, 8. Between the base of the transistor 9 and one terminal of the Zener diode 4, the base-emitter path of the transistor 5 is connected in the same way as in the example according to FIG. The collector of the transistor 5 is connected to a supply line via a resistor. In addition, the collector is connected to the input of the trip stage 6 via a diode 11. The release stage 6 is fed by the stabilized operating voltage £ /. An input signal is fed to the release stage via terminal 12. The mode of operation of the circuit according to FIG. 2 largely corresponds to that of the circuit according to FIG. 1. If the voltage U ₁ is too low, the transistor is also closed. In this way, however, the voltage present at the resistor 10 during normal operation then drops, with the result that the input of the trigger stage 6 is short-circuited. A signal supplied via terminal 12 can then no longer actuate the release stage. Instead of trigger stage 6, another circuit is also conceivable. The connection line between the collector of the transistor 5 and the trigger stage 6 is unimportant for the control process.

ίο Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß unter Vermeidung einer besonderen Meßschaltung sowie unter Verwendung bereits vorhandener Auslösestufen mit geringem Aufwand eine Schaltung für Stromversorgungseinrichtungen mit einer Z-Diode erstellt wird, durch die sich eine Sicherung gegenüber fehlerhaften Signalen, beispielsweise bei Schutzrelais, infolge zu niedriger Betriebsspannung erreichen läßt.ίο The advantages achieved with the invention exist in particular that while avoiding a special measuring circuit and using already a circuit for power supply devices with little effort is created with a Zener diode, through which a fuse against faulty signals, for example in the case of protective relays, due to the operating voltage being too low.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

1 2 hen, including high-voltage motors, claims :. Protects high-voltage lines and high-voltage transformers. Protection relays respond to faulty '

1. Power supply device, in particular adhering currents, voltages or impedances in for protective relays, with a control or stabilization 5 high and medium voltage networks.
Approximation circuit, the reference element of which is a In the following the invention on the basis of the Z-diode is characterized. Embodiments shown in FIGS. 1 and 2, that in series with the Zener diode (4), the base emits are explained in more detail, from which further one-term sections of a not included in the control process details as well as further advantages result. Thereby, a blocking signal is shown on the collector side

benden transistor (5) is located. F i g. 1 a power supply device with a

2. Power supply device after control of the output voltage,

Claim 1, characterized in that the KoI- Fig. 2 a power supply device with a lektor-Emilter path of the transistor (5) in stabilization of the output voltage.
Row with a current-dependently controlled release. 1 power supply stage (6) shown. device with a known control switch

3. Power supply device according to Ant 3 is the unregulated operating voltage U ₁ claim 1, characterized in that the KoI via the terminals 1, 2 is supplied. The reference variable of the transistor (5) via a resistor for the voltage to be regulated is the voltage of a (10) with a supply line and the input Z-diode 4, one pole of which is internally in the output of a triggering stage (6) with the collector control circuit 3 is connected and the others of the transistor (5) are connected (FIG. 2). Pole across the base-emitter path of one not into the

Control process intervening transistor 5 with the on

the supply line connected to terminal 2

35 is connected. The transmission direction of the base emission

ter route of the transistor 5 is polarized such that at

When the Zener voltage is applied, the current flowing through the Zener diode 4 turns the transistor 5 on. As a result of the series connection of Zener diode 4 and

The invention relates to a power supply 30 base-emitter diode of the transistor 5 is used for

transmission device, especially for protective relays, with the power supply device used Refc-

a control or stabilization circuit, whose residual voltage is adjusted by the diode lock voltage.

The reference element is a Zener diode. upscale. The collector-emitter path of the transit

Power supply devices are used, among other things, 5 is in series with a current-dependent gestcurem the supply of electronic devices with 35 th trigger stage 6, which is connected to the unregulated operation of a regulated or stabilized voltage. When voltage IZ _{1 is} connected. The trigger level 6 electronic circuits, however, it often belongs to an already different, that when switching on or off or a widely provided, to the regulated operating voltage interruption of the operating voltage as a result of a voltage U., connected device, for example by Capacities related time con 40 to a protective relay. Instead of the release pins 6, there is an erroneous release from the slow change - another circuit is also conceivable. The regulation of the operating voltage is caused. development does not take place via the connecting cable of the

In order to prevent such false tripping, the collector of the transistor 5 and the tripping stage 6.

one could provide a separate flip-flop that is shown in FIG. 1 is further indicated that the output of the

if the value falls below a specified value, trigger level 6 is formed by a transistor,

Operating voltage blocks the trip circuit. This is done in series with a relay and transistor 5

however, indicates an undesirable additional support. Both transistors thus set an AND-

Wall. The regulated operating voltage U ₂ is on

The invention is therefore based on the object of tapped the terminals 7, 8.

A simple circuit for power supply devices, especially for protective relays, to create the following: In normal operation, when the operating voltage drops, the unregulated voltage U _{1 is} greater than the regular false trips be avoided. apply voltage i / _a . The voltage regulation takes place in

According to the invention, this object is achieved in a known manner "with the control circuit 3. In this case, the base-emitter 55 flows in series with the Zener diode via the Zener diode 4, a current that does not affect the transit path. aufsteuert in the control process intervene sturgeon. This current is fenden of the voltage on the collector side a blocking signal emitting U ₁ dependent. If the voltage U ₁ is so small that the transistor is located. in the inventive current through the Z-diode 4, no current flows, the supply device is blocked without an additional transistor 5 and thus 'also the trigger stage 6 ge-measuring circuit with advantageous utilization' of the 60. Then, due to another response level given by the Zener diode with trigger stage 6 , no signal given Triggering only little effort, the desired backup can be created.

achieved compared to tripping. As an additional, the desired safeguard against false tripping

The effort is essentially just one transistor. If the operating voltage is too low, it is therefore necessary

the one from which a lock signal is derived that reaches 65 using only one transistor,

in already existing release devices, e.g. B. In the case of FIG. 2 shown power supply

Protection relay, intervenes. . a stabilization circuit is provided.

A protective relay is to be understood as meaning a device which essentially consists of a transistor 9 and