DE2824233A1

DE2824233A1 - Electric power substation relaxation oscillation damping appts. - uses ballast resistor and associated heat accumulator plate arranged in housing with excess temp. protection circuit

Info

Publication number: DE2824233A1
Application number: DE19782824233
Authority: DE
Inventors: Heinz Dr Ing Kraeft
Original assignee: Ritz Messwandler GmbH and Co KG
Current assignee: Ritz Messwandler GmbH and Co KG
Priority date: 1978-06-02
Filing date: 1978-06-02
Publication date: 1979-12-06

Abstract

There is a ballast resistor together with a heat accumulator plate (2), and an excess temp. protection device arranged in a housing (4) in parallel with the load (7). The device is designed to eliminate heavy thermal loading on the voltage transformer (6) used in electrical power feed substations, and the associated difficulties in removing the heat are avoided. The arrangement is calculated to rapidly, e.g. in 0.2 sec., remove any relaxation oscillations that occur during switching of the station into a drive mode, which such that the station remains unconnected to the cleared mains network. The voltage transformer remains practically unloaded thermally during operation. A signalling contact is specif. provided on the excess temp. protection device.

Description

Gerät zur Beseitigung von Kippschwingungen Device for eliminating tilting vibrations

bei Inselbetrieb von Einspeise - Stationen "Inselbetrieb" besteht in Einspeise-Stationen, solange diese noch nicht in Verbindung mit dem gelöschten Netz stehen. Kippschwingungen werden in solchen Stationen i. a. mittels Dämpfungswiderstände im en-Dreieck beseitigt. Wenn die Spannungswandler keine en-Wicklungen besitzen, werden Zwischen-Spannungswandler verwendet oder es muß die Bedämpfung an den Meßwicklungen erfolgen, wobei allerdings die Wandler ständig meßtechnisch und thermisch stark belastet werden und die Abführung der Wärmemenge Schwierigkeiten bereiten kann. there is "island operation" in the case of isolated operation of infeed stations in feed-in stations, as long as these have not yet been connected to the deleted Network stand. In such stations, tilting vibrations are i. a. by means of damping resistors eliminated in the en triangle. If the voltage transformers do not have en windings, intermediate voltage transformers are used or the damping must be applied to the measuring windings take place, although the transducers are constantly measuring and thermally strong are loaded and the dissipation of the amount of heat can cause difficulties.

Das zur Vermeidung dieser Schwierigkeiten vorgeschlagene einfache Gerät (Fig. 1) besteht aus einem Kaltleiter (1), ggf. mit Wärme speicher Platte (2) und Übertemperatur-Schutzgerät (3) in einem Gehäuse (4) mit Klemmen (5). Der Spannungswandler ist mit (6), die Nutzbürde mit (7) bezeichnet.The simple one suggested to avoid these difficulties Device (Fig. 1) consists of a PTC thermistor (1), possibly with a heat storage plate (2) and overtemperature protection device (3) in one housing (4) with terminals (5). Of the Voltage converter is marked with (6), the useful burden with (7).

Beim Einschalten der Station nimmt der Kaltleiter (1) sofort kurzzeitig die gewünschte Wirkleistung auf (bei verlagerter Spannung von 100 V z.B. 500 Watt). Im Laufe son z.B. ca 10 s klingt die Leistung z.B.When the station is switched on, the PTC resistor (1) immediately takes a short time the desired active power (with a shifted voltage of 100 V e.g. 500 watts). In the course of e.g. about 10 s, the performance sounds e.g.

auf 2 Watt ab. Die Wärmespeicher-Platte (2) sorgt dafür, daß der Bedämpfungsstrom während z. B. 0> 2 s in dem gewünschten Größenbereich bleibt. Bei etwaigem Schadhaftiverden des Kaltleit ers (1) öffnet der Sprungkontakt des Übertemperatur-Schutz gerätes (3) (gegebenenfalls mit Meldekontakt 8) den Stromkreis.down to 2 watts. The heat storage plate (2) ensures that the damping current while z. B. 0> 2 s remains in the desired size range. In the event of damage of the PTC thermistor (1), the snap contact of the overtemperature protection device opens (3) (if necessary with signal contact 8) the circuit.

Nach dem Einschalten und ggf. Abklingen einer Kippschwingung sowie nach dem Trennen vom Netz sind in solchen Stationen keine Kippschwingungen zu erwarten. Vorsorglich könnte bei Bedarf ein Bimetall-Kontaktgerät (9) in Zeitabständen die Bedämpfung von einigen Minuten erneut zuschal ten.After switching on and, if necessary, a breakdown oscillation as well after disconnection from the network, no breakdown vibrations are to be expected in such stations. As a precaution could, if necessary, a bimetal contact device (9) at time intervals Switch the damping on again for a few minutes.

Claims

Claims Claims device for damping tilting vibrations d.g., that a PTC thermistor (1), if necessary with heat storage body (2) and over temperature protection contact device (3) is installed in a housing (4), possibly with terminals (5), and is dimensioned so that Any breakdown vibrations when switching on a feed-in station in isolated operation be eliminated in a short time (e.g. in 0.2 5) and the voltage converter (s) (6) are practically not burdened in terms of metrological and thermal engineering in the company.

Claim 2: Device according to Claim 1 d, g.> That a signaling contact as required (8) is attached to the overtemperature protection device (3).

Claim 3: device according to claims 1 and 2 d, g.> That for repetition a bimetallic contact (9) is installed at the required time intervals for damping.