SU508849A1 - Device for multistage remote directional relay protection of parallel lines of electrical transmission - Google Patents

Description

3

cops 7. The outputs of logic elements 7 are connected to the disconnecting circuits of the first and second long lines.

The outputs of the logical elements “And 10, 11, 12 and 13, respectively, are connected to the first inputs of the logical elements“ NO 14, 15, 16, 17. The second blocking inputs of these logic elements are connected to the control units of the circuit breaker disconnecting circuits of the second circuit

18k to the logical elements "NO 14, 15 and the control unit for disconnecting circuits of the first line

19 to the logical elements “NO 16 and 17. The second outputs of the logical elements“ NO 15, 17 are connected respectively to the additional outputs of the measuring organs 4 and 3.

The outputs of the logic element SIBN1B "NO 14, 15 are connected to the disconnecting circuits of the first line breakers, and the logical elements NO 16, 17 are connected to the disconnecting circuits of the second line breakers.

The device works as follows.

The element of the transverse differential current start 9, connected to the difference of the currents of the phases of parallel lines, eliminates the wrong operation of the circuit during oscillations or external short circuits x. Therefore, it is used as a further starting organ of the measuring organs of the cervix and second stages of the protective circuit for acting in addition to blocking during oscillations and an additional delay in the second section of the defense.

In one of the parallel lines in the zone of action of the first stage of protection, the measuring body (for example, 1), body 8 and the element of transverse differential current start 9 are triggered. The protection for shutting off the damaged line can occur along the “And 10 and "NO 14, or according to the corresponding IM1. IM chain logic protection elements 7.

None of the organ failure 8 or damage on the line following the external k. 3., the device will be disconnected from the I 10 and NO 14 logic circuits.

Kri. 3. on one of the parallel lines in the zone of action of the second stage of protection, the disconnection of the damaged line is performed by the measuring body of the second stage (for example,

measures, 3) without a time delay and in addition to blocking when swings along the logic circuits “H 11 and“ NO 15.

The prohibition of the operation of the device of the corresponding measuring body of the second stage of the protection of the second line (for example, 4) prevents the possibility of improper shutdowns of an intact line at a checkpoint. on the second line in the zone of sensitivity of the remote organ of the second stage of the intact line. Sri location to. H. in the sensitivity zone of the measuring body of the second stounoni of protection of the parallel line or in the zone of the cascade element of the transverse differential current start, the disconnection of the damaged line starts in cascade.

When the damaged line is disconnected, the corresponding block control unit of the line circuit breakers (for example, 18) blocks the device disconnecting circuits by applying prohibitive signals to the corresponding "NO" logic elements (for example, 14, 15).

Claims (1)

Invention Formula A device for multistage remote directional relay protection of parallel power lines, containing for each line trigger and measuring organs, swing blocking organs, logic elements and tripping circuits, in order to improve speed and irodes, the device has a common for parallel lines, an element of a transverse current differential switch connected to current transformers of plugged lines, and its outputs through logic gates “H are connected to auxiliary The digital outputs of the measuring bodies of the first and second stages of both sets of protection, and the outputs of the mentioned logical elements "And through the elements" are NOT connected to the opening circuit of the breakers of the corresponding lines, the second prohibitive inputs of the elements "NO protection levels); another line, and prohibiting inputs of the elements; NOT-; T of the second protection stages are also connected to the aforementioned additional outputs of the second stages of the measuring bodies of the other parallel line.