SU93585A1 - Automatic drive to load switches (power disconnectors) with remote control - Google Patents

Description

In modern actuators to the load switches of type VNP-16 (power disconnecting switch) with the disconnecting relay (coil) e, it is possible to carry out the control circuit of the protection circuit only with the use of remote relays.

The present invention aims to create a new type of load with built-in relays, thereby reducing the costs of equipment and connecting devices. Protection against short circuits in the proposed scheme is provided by fuses of type PC.

For overload protection, it is proposed to integrate a maximum relay (coil) with a time delay mechanism into the drive to the GNP-16, instead of the disconnecting relay (coil) of remote action.

In order to prevent a discontinuity of current exceeding up to a pred. v.4, a second current relay (coil) of instantaneous action is established by the switch-disconnector, but acting not on switching off the drive, but on the contrary, locking the shutdown mechanism when leaking

eat TOKoij. what is carried out mechanically and; n1 electric b.toleathing.

FIG. 1 shows a protection circuit with an overload relay / time delay and a re-lock 2, built-in to the drive of the load switch 3. As protection or short circuits, fuses 4 (of a PC type) are shunt.

The coils of both relays are connected to the current transformer circuit 5 and 6 for the difference in current between the two phases.

FIG. Figures 2 and 3 show 1s the sketches (in two projections) of the variant / version of the new control with built-in protection and blocking relays, and FIG. 4 and 5 are sketches (in two projections) of variant I with the following notation: / - drive corn (base); 2 - drive handle; 3 - a lever activating the system for switching off the core from the closing coil; 4 - add to the plate, welded to the lever 3 when installing two disconnecting coils (overload and remote action); 5 to 6 - pejse (coil) dist) W 50nnogo action and

its (her) core {in drives with built-in relays is installed only in the presence of gas, earth, and other protections carried out by remote relays); 7 and S - the relay (coil) of the maximum current (overload relay) and its (its) core; 5 - time mechanism to relay 7; 10 11 - blocking current relay (coil) of instantaneous action / ii, f | p (her) "core; 12 - shut-off iiJiaHKa, welded to the core of the locking coil, T Ri, the lock on the variable G (fig. 2 and 3); 13 is locked njiaHK J4 H. blocking, option-U (Fig. 4 and 5); 14 - holes in the striker plate 13; 15 - direction of Yush, the locking bar 13; 16 is a sector for attachment of a drive coupling with a load switch and with signal interlocking contacts; 17 - t ha connection with signal interlock contact.

The purpose of electromechanical interlocking, as mentioned above, is to ensure that when overcurrents exceed their maximum permissible disconnecting current of the load switch, to prevent it from disengaging under the action of the overvoltage. Structurally, the implementation of the locking device is not difficult.

In option / (FIGS. 2 and 3), a locking bar 12 is welded to the core of the current relay (coil) 10 used as a blocking relay (or the core is provided with a locking pin). While the core of the blocking relay is not retracted, the lever 3 of the drive shutdown system is turned off. L load can be rotated freely by the action of the core 5 or the core 6.

When the locking relay 10 triggers, its core AND is pulled in and the striker 12 prevents the turning of the lever 3 of the shut-off system. drive case off vnp-16 impossible.

According to the variant // execution of the electromechanical blocking (Fig. 4 and 5), the bar 13 is welded to the core of the locking relay 10 with one or two openings (according to the number of installed coils of the relay, which are off). Normally, the core 8 or the core 6, when retracted into the coil 5 of its relays, passes through the holes 14 in the locking bar / 5 and acts on the lever 3, driving the Shut-off-16 switch-off system.

When the blocking relay 10 is triggered, the bar 13 moves forward in the direction of its 15 (it creates stiffness). The holes for the result of this are mixed, and the cores 6 1 8 cannot act on the lever 3 or on the plate welded to the lever 4.

Before mete lz about breet with and and

The automatic drive to the load switches (disconnectors, bridges) with remote control, differs by the fact that, for the purpose of protecting the feeder, the drive has a built-in disconnecting switch, the maximum current relay (coil) with a time delay mechanism and instantaneous blocking relay (coil) acting through the switch and moving it to the tripping mechanism so that switching off occurs at overloads not exceeding the switching capacity of the power disconnectors (up to 350 a) and blocking at high overload x

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