DE294283C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- JVl 294283 CLASS 21 c. GROUP

Phase earthing switch. Patented in the German Empire on March 4, 1916.

The present arrangement is used to ground the relevant in the event of a ground fault in the network Phase in the headquarters so that the one that appears as a transition of fire Earth fault in the network disappears, and the innovation consists in the 'special Execution of the control units for the individual earthing switches of the three-phase network, because it must meet the known requirement

ίο that only ever one of the three phases can be connected to earth to avoid a complete short circuit on the busbars to prevent. For this purpose, three phase relays are arranged, each of which is at The associated earthing switch of the relevant phase is de-energized Latched position releases, while a simultaneously responsive mechanical switch-on device is set in motion. The device is designed in such a way that all three earthing switches can be used is to switch on gradually as the mechanical closing device moves, but that only the first to come into engagement with the mechanical closing device Switch can be turned on, and on it in some way the other switches be locked mechanically or electrically. This arrangement would also work if not only one phase but two phases get earth fault. However, due to the nature of the locking mechanism, it is always only a phase can be connected to earth. The latter is in two phases in the event of an earth fault without hesitation, because in this case it doesn't matter which phase you start with grounded in the control center.

The arrangement can be seen in more detail in the drawing. There are three single-phase transformers a, b, c , the secondary windings d, e, f of which work on the coils g ¹ , g ² , g ³ . The earthing switches I ¹ , I ² , P are held in the switched-off position by the latching k ¹ , k ² , k ³ and can be brought into the switched-on position after the latching has been released

one
«2

of approaches m ¹ , m ² , m ³

if in grooves n ¹ , n ² , n ^{3 of} the rod ο can engage, which is moved back and forth by the motor φ. The latter receives voltage if one of the coils g ¹ , g ² or g ³ releases its core due to the de-energization of d, e or f , thereby closing the contacts s \ s ² or s ³ as well as the latching at k ¹ , k ² or k ³ solves. If contact is made for the motor <j> , it starts to turn and moves the gear in the direction indicated by the arrow. Here the rod is ο moved back and forth. If one of the grooves η comes under a shoulder m, the pawl of which is released at k , the shoulder m can snap into place and the earthing switch I closes the contact for the earthing of the relevant phase at q. A contact r attached to switch I is opened and εο the motor -p is stopped.

If, in the present arrangement, e were to be de-energized, so that the coil g ² releases its core, the contact s ² closes and the latching at k ² is released, the switch I ² would be, as shown in FIG

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60

Claims (1)

Come on, because after the motor has started φ from its rest position (Fig. I) m ^{2 is} inserted into the slot w ³ , the earthing switch closes at q ² and the motor interrupts at r ^2. As a result, the rod can ο no longer run. If at the same time f had also become dead and g ^{3 had released} the latching of I ^s at k ³ , the switch at ίο q ³ does not close, since the approach m ³ does not have the opportunity to enter the groove n ^a , because the rod ο has already locked itself before the ^{collapse of fw 2} in n ² and at the same time the circuit of the motor p is broken ^{at r 2} became. Another arrangement can also be used in place of the one shown. Condition is only that when they respond, one of the earthing switches through the mechanical closing device inserted and then the latter is shut down, so that it is impossible to use a second switch as well to turn on. Pa τ εν τ-claim :. Phase earthing switch, the closing of which is controlled by three phase relays, thereby characterized in that when one or two phase relays respond, first a mechanical switch-on device in each case The three phase earthing switches are set in motion, one after the other can be closed, provided they are blocked by a phase relay that has responded to the existing earthing had, was triggered, but the device is such that when two relays respond at the same time only which in turn happened to be reached first by the mechanical closing device associated phase switch is closed, after which the switch-on device is switched off and the switching on of a further phase switch prevented by electrical or mechanical locking will. 1 sheet of drawings.