SU518832A1 - Device for single-phase automatic reclosing of power lines - Google Patents

Description

damaged phase and when the current relay or voltage of the zero sequence fails.

As a result of entering in. the action of the RTZ is ensured immediately after the sequential fixation of the occurrence of the indicated signals, i.e., if, firstly, the action of the OAPV unit on the re-activation of the damaged phase occurs, and secondly, at 1 current failure or zero-sequence voltage.

The first case is caused by the impact of the UADV block on solenoids intended for

turn on the switch, the second return of the current relay or; {a1; (p 1 of the zero after the fall of the circuit, which is blocking the trip of the three phases of the switch, and phase fault).

The drawing shows a structural electrical circuit of the device.

The device for single-phase automatic re-activation of power lines contains ojiOK, al single-phase automatic reclosing (OAPV block) I; unit for taking out a linear protection; out of the full phase mode (VSD block) 2 containing the logical OR OR 3 element OR 4, AND 5 and AND 6 logic elements, Ban elements 7 and 3) 8. Logical elements Ti l Temporary to us VP 9 and VP 10.

Additional elements 3apret 8, VP 9 are included in the VNZ 2 block in such a way that the switching-on output 1 of the AALV 1 unit through the elements of the VP 9 .if Barring / 8 connection is connected to the third input of the OR 4 element, and output 12 of the zero-input voltage relay of the OAPV block 1 through e; VP 10 is connected to the prohibitive input of the element 3apre 8.

Element VP 9 serves to increase the duration of the KpaTKOBpeNjeHHoro signal from output 11, and element VP 10 to delay the time after the current relay (voltage) returns to zero-sequence 6.vroKaOAJIB 1.

The element Prohibition 8 serves d, 1: prohibit the signal from the output of the VP 9 on the element) t Prohibition 7 through the elements OR 4 6 6 until the signal disappears from: 1 the gate of the VP 10, i.e. after the time specified by the element 10 after the return of the current relay (voltage of zero sequence).

The device works as follows.

About dn o fa 3 n o e KZ. After the line protection has been triggered and the OAPV unit 1 is started up, the faulty phase is turned off, and a short-term signal 13 and a long signal 14 appear at the output of the unit OAPV 1, the short-term appearance of the signal 13 is fixed by means of the elements OR 3 and K b, resulting in The output of the 3apret element appears for a long time. A signal 15 is output from the output of the relay protection, which is tuned from a non-single-phase mode.

Successful OAPV. Under the action of the AADO unit on the disconnection of the damaged phase, a signal 15 appears and the protection, which is configured against an incomplete phase mode, is brought to work.

When this block acts on the re-activation of the damaged phase, a short-time signal 14 appears, which through the element 9 enters the input of the element 7: a 3 is the default 8. However, the signal at the output of the latter does not appear until after the phase has been successfully turned on, the current relay (voltage) of the zero sequence of the OAPV unit 1 will not return, i.e. Signal 12 will disappear at the input of the element GO GC, and then at the output of the last, connected, with the prohibitor input of the Ban 8 element. Jbinib then the output of element 8 will turn on the signal that most will be fixed by the elements OR 4 and AND 6.

S As a result, a long signal will be sent to the input element of the Block 7, the signal 15 will disappear, the protection deactivated when the damaged phase is turned off will be put into operation.

H 6 u s p e HI n o e AALV. When the fault / current phase is switched on again on the non-eliminating short-circuit, the AALV 1 unit acts to turn off all three phases of the line. A short-time signal 16 appears, the coS 1 Era is fixed by means of the elements OR 4 and AND. As a result, the prohibiting entry of the prohibition element 7 will be received e) The P1 signal from the course of the element AND 6, the signal 15 will disappear, and the protection output disconnecting one phase is entered into

work

Similarly, the device operates in the event of damage to the remaining phases in the operation of the phases and the OAPV cycle 1 after they are turned off and. signal impulses. 16. M o r d f f 3 a n k e short. After triggering the protection of the start-up of the unit OAPV 1, all Tjiex phases are disconnected, and the output of the unit OAPV 1 shows a short-time signal 3 and 16 and a duration1pl signal .14.

Short time signals 1.3 and 16 are fixed respectively by e / uyunta OR .3 and AND 5 (signal 13} to OR 4 n And b (signal 16). Despite the appearance of a signal at the output of the element And 5, signal 15 at the output of the electric element The ban appears because

S The declining input element of the Inhibit 7 element is the output signal of the And 6 element.

In all the cases considered, the return of the VNZ 2 block occurred and t after the signal 14 disappeared, i.e. after the return of the unit UAPV 1 to the original position. The time delay for the return of an element 1.0 should be equal to 0.15 s. In the case, a reliable return of the relay power and starting current organs will be guaranteed to protect the zero sequence by the moment of entering into

5 dshystzie this defense after restoring the symmetric mode of the line.

Zameleg VP 9 is provided for the manifestation of short-term switching on the signal 1 for a time, with a required margin exceeding the sum of time

return current relay (voltage) zero sequence

and the element of EP 10 with the possibility of non-simultaneous inclusion of the phase at the ends of the line.

Thus, the addition of the VIS 2 unit with the Ban element and two VP elements allows you to ensure quick commissioning of the protection, which is not removed from the incomplete phase mode, after the successful CBS of the damaged phase, which increases the reliability of the transmission line.

Claims (1)

Invention Formula Device K: --- single-phase automatic reclosing of power transmission, containing a unit for single-phase automatic reclosing (OAPV) with a zero-sequence current relay (voltage) and a unit, w, deactivating relay operation, which is not current from an unbalanced mode, which two logical elements OR are connected by their first inputs to the outputs of the UAPV block, and to the outputs from the first ™ inputs of two elements AND, the second inputs; which are connected to the output of the OAPV unit, and the outputs each to its own entry of the Prohibit element and the second input of its own element OR, which is so that, in order to increase reliability, to the unit to take the relay out of operation for / liti kvedeni; logical elements Temporary memory (VO) and supplement. logic element Prohibition, the on-output output of the OAPV unit through the first VP element to the additional element —th element The prohibition is connected to the third input on Meivjeura iijlM, and the output pejse of the current (the VAGS zero voltage is connected to the prohibitory input on the secondary element The element of the ban. )