DE967173C - Arrangement for establishing or restoring the operational readiness of glow cathode rectifier tubes - Google Patents

Description

. Arrangement for establishing or restoring operational readiness of hot cathode rectifier tubes hot cathode rectifier tubes for large Power require a warm-up time of several minutes before they are ready for operation. This heating-up time, which is ensured by a time relay, is particularly useful for large transmitters perceived as very annoying in the event of a malfunction. The full heating-up time is only then required when the tube is brought from the cold state to operational readiness shall be. In the event of a fault, however, in the event of a brief power failure, the cathode still warm, so that here the full warm-up time is granted for restoration operational readiness means an unnecessary waste of time.

Arrangements have become known that reduce the heating time affect; however, these are; dependent on special tube constructions because the Change in length of the heating coil is used to determine the heating time.

According to the invention it is now proposed to use a timing relay as an additional device to provide, its proper time depending on the previous currentless Pause is automatically set without interfering with the tubes.

This timing relay, whose lead time depends on a previous one currentless break, contains, for example, a synchronous motor with a spring, which is tensioned during the advance. In the event of a power failure, this spring causes a through an inhibitor delayed return. If the net returns, the advance begins the pen of one such position, which depends on the straight ended pause time. The escapement is adjustable so that the return speed can be chosen at will. In this way, the heating break can be dependent on the heating break Heating time can be achieved, which can also be adapted to the respective type of tube can.

In addition, the contacts can have an additional instantaneous switching received (spring spring mechanism), which inevitably results in a delayed switching on and off takes place for the purpose of bridging short-term voltage drops (voltage wipers).

In another way, the heating-up time can also be achieved by means of RC elements or RL elements are controlled, in which the state of charge or saturation as a function of the duration of the currentless pause is determined, making the relay dependent on the pause time controls the heating-up time. The operation of the RC or. RL links are appropriate Via current transformers or voltage dividers, rectifiers and mechanical or electronic Relay:

Claims (5)

PATENT CLAIMS: i. Arrangement for establishing or restoring the operational readiness of hot-cathode rectifier tubes without special training and for limiting while simultaneously ensuring the heating-up time, characterized in that a time relay is provided as an additional device, the operating time of which depends on the previous currentless pause without intervention_ is automatically set in the tubes. 2. Arrangement according to claim i, characterized in that in in a manner known per se, one or more by an electrically driven motor Contacts are closed or opened after an adjustable time and also a spring is tensioned, which in the event of a failure of the operating voltage is triggered by an inhibitor delayed return, so that when the voltage returns, the lead time is dependent on the siromloseri break. 3. Arrangement according to claim i and 2, characterized characterized that the escapement and thus the return speed adjustable ' is. 4. Arrangement according to claim i or one of the following, characterized in that that contacts with instantaneous switching are used; which only after a certain Open or close time. 5. Arrangement according to claim i, characterized in that the setting of the timing relay is carried out by RC or RL elements. Considered publications: German Patent Specifications No. 471946, doo 179, 668 8 87, 737 799..