SU516144A1 - Directional resistance relay - Google Patents

Description

one

The invention relates to relay protection of power systems and can be used in remote protection of power lines.

A known directional resistance containing a starting member with an opening contact and a successively connected circuit for forming two quantities, including intermediate current transformers (transreactors) and voltages, a comparison circuit and a reacting organ.

However, such a resistance relay does not have a dependent response time characteristic and, therefore, does not always provide the required speed.

The purpose of the invention is to obtain a dependent response time characteristic during the modulus and phase comparison.

In order to obtain a dependent response time characteristic when comparing modulo, the proposed relay is additionally equipped with a successive alternating signal deceleration unit included on the day of the secondary winding of the intermediate voltage transformer, and to obtain a dependent response time characteristic when compared to phase, it is additionally equipped with an alternating alternating time variable the signal included in the secondary circuit of the transreactor. With

This alternating delay signal is made using a rectifying bridge, in its own inputs between the input and output of the unit itself, and the outputs to the parallel-connected resistor, capacitor and the breaker contact, and the second resistor shunting the output of the unit. The parallel variable-signal delay unit is made using a resistor connected between the input and output of the unit itself, and a circuit that shunts the output of the unit n consisting of the second second resistor in series and the rectifying bridge, the input of which is connected in parallel with the capacitor and the normally open contact body.

FIG. Figure 1 shows a block diagram of a polarized impedance relay with a dependent time response characteristic, when compared modulo; in fig. 2 is the same when comparing but phase; in fig. 3 is a diagram of a sequential retarding block; in fig. 4 is a diagram of a parallel deceleration unit; in fig. 5 shows the tripping characteristics of the proposed relay for different times ti, t2 and / 3, moreover.

The relay contains voltage transformers 1, transreactors 2, a serial slowdown unit 3, a parallel zamsdl yushchiy unit 4, circuit 5 is compared modulo

two electrical magnitudes (voltages / A; and E :,), circuit 6 versus the phase of two electrical quantities (voltage 1) and fo) the reacting organ 7.

Serial and parallel deceleration, org (figs. 3 and 4) contain resistors 8 and 9, rectifying washes 10, capacitor 11, disconnecting contact 12 of the triggering organ.

When emitting and directing a resistance relay on the basis of a comparison of two greatnesses but modulo these values, they form the following way:

 E, K, U + Kj; E ,.

Due to the effect of sequential slowing down of its block 3, the coefficient / Ci varies 150 times so that

K, K ,, (a,

where the Kill coefficient determined by the parameters of the voltage transformer 1, ui and 1 are the coefficients estimated by the parameters of the circuit of FIG. 3

In this case, the relay has a circular response characteristic

TO

Z,: -Kin ("1 -)

passing through the origin.

From the last expression, it is clear that the diameter of the circle varies over time, i.e., a dependent response characteristic is obtained.

When performing a rated resistance relay based on a comparison of two magnitudes, but compared to a phase, the compared quantities are formed so that

E, K, and + KJ;

E, K, nd, and the phase comparison organ is triggered if

tb1

.

2

Due to the influence of the parallel decelerating unit, the coefficient / (2 varies with time, with

/ S,: / S, L1 - “..

where is the coefficient determined by the parameters of the trans-reactor;

“2 and & 2 are coefficients depending on the parameters of the Scheme of FIG. four.

With that said, pc.ie has a circular

tripping characteristic passing

through the origin and having a diameter

circles equal to and dependent on time

where

Ar rCl-a s-)

one

Thus, in this case, a dependent response characteristic was obtained, a relay was obtained, the response time of which depends on the voltage and current values supplied to it, i.e. it depends on the distance to

damage sites.

Claims (4)

1. Directional resistance relay, containing its starting element with opening contact and a series-connected two-value formation circuit, including intermediate current transformers (trapsreactors) and voltage, the comparison circuit and the reacting organ, characterized in that, in order to obtain a dependent response time characteristic when comparing modulo, it additionally Equipped with a successive decelerating unit of a non-simultaneous signal connected to the secondary circuit of the intermediate voltage transformer. 2. Relay zo p. 1, characterized in that, in order to obtain a dependent response time characteristic when compared in phase, it is provided with an additional parallel decelerating unit of an alternating signal connected to the secondary circuit transineactor. 3. Relay on Mon. 1 and 2, characterized in that the selective delay signal block of the alternating signal is made using a rectifying bridge connected by its own the inputs between the input and output of the unit itself, and the outputs to a parallel-connected resistor, capacitor and disconnecting contact of the fluke organ, and the second resistor shunting the output of the unit. 4. Relay clause 2, characterized in that the parallel decelerating unit of the alternating signal is made using a resistor connected between the input and output of the unit itself and a circuit that shunts the output of the unit and consists of a series-connected second resistor and a rectifying bridge, at the input of which a capacitor is connected in parallel with the opening contact of the actuator. 1 Fig.Z FIG. 2 Uf Rig. 1 to