RU534U1 - Device for differential-phase high-frequency power line protection - Google Patents

Abstract

1. Device for differential-phase high-frequency protection of the power line, containing a phase comparison body, the input of which is designed to connect to the current output of the RF signal receiver, a relay output unit, the first input of which is connected to the output of the phase comparison body, and the second input is designed to connect to the output of the starting protection bodies, characterized in that an external short-circuit locking unit is inserted into it, and the relay output unit is equipped with an additional input, while the input of the external short-circuit locking unit a short circuit is connected in series with the input of the phase comparison body, and the output of the external short circuit block is connected to the additional input of the relay output block. 2. The device according to claim 1, characterized in that the external short-circuit locking unit is made in the form of an input optical key, a return delay time element, a response time delay element, a return delay element with an inverse output and a power source connected to the pole windings of an intermediate relay, the make contact of which is connected in series with the winding of the output relay between the poles of the power source.

Description

Device for differential-phase high-frequency protection of power lines. Field of technology A utility model relates to the field of electrical engineering, in particular to the relay protection of power lines. BACKGROUND OF THE INVENTION A device is known for directional high-frequency (HF) protective power lines with voltage PO-ЗЗОКВ IJ. The disadvantage of this device is the impossibility of ensuring that they are not roughened by starting blocking protection bodies on the detuning from the p | 0rmal mode on high-voltage lines (VL) supplying the load with traction. The roughening of the starting blocking organs leads to the roughening of the starting disconnecting organs and Hotkaz in the actuation of the protector, which is unacceptable. A device for differential-phase high-frequency protection of the power line 1 -2 J. This device, adopted as a prototype, contains a phase comparison body, the input of which is designed for connecting to the current output of the RF signal receiver, a relay output unit with two inputs. The disadvantage of the prototype device is that when it is used, it is possible that the protection is unnecessarily activated on an intact overhead line due to a transient process,

on the network and the defense manipulation body, Disclosure of a utility model

The task of the present proposal is to create a device that can increase the reliability of the protection of consumers' power supply and the stability of parallel operation of power systems by preventing excessive protection from tripping when a short circuit (short circuit) is disconnected on bypass connections.

This problem is solved by the fact that in the device for differential-phase high-frequency protection of the power line, containing a phase comparison body, the input of which is designed to connect to the current output of the receiver of RF signals and a relay output unit, the first input of which is connected

with the output of the phase comparison body, and the second input is designed to connect to the output of the starting organs

fixing an external short circuit, and the relay output unit is equipped with an additional input, while the input of the unit

external short circuit

only with the phase comparison control, and the input of the external short-circuit lock block is connected to the additional input of the relay output block.

This allows you to prevent excessive shutdown of intact overhead lines with external short-circuit on bypass connections. The utility model has been developed regarding the most preferred embodiment of the external short-circuit fixation unit in the form of

a series-connected input key, a return delay time element, a response time delay element, a return time delay element with an inverse output and a relay coil, the make contact of which is connected in series with the output relay coil of the unit.

This embodiment of the block fixation of the short circuit allows to increase noise immunity and reduce the power consumed by the device.

The list of figures drawings.

The essence of the utility model is illustrated by drawings ;, FIG. I - block - diagram of the proposed device; FIG. 2 is a schematic diagram of an embodiment of an external short circuit locking unit,

FIG. 3 - block - diagram of the device with the basic implementation of the relay output unit.

Information "confirming the possibility of acquiring the utility model.

The device of FIG. I contains a phase comparison body I, input 2 of which is intended to be connected to the current output of the RF signal receiver, relay input unit 3, first input, 4, which is connected to output 5 of organ I, and second input b is used to connect to the output of the starting protection bodies .

An external short-circuit fixation unit 7 is introduced into the device, the input 8 of which is connected in series with the input 2 of organ I, and the output 9 of block 7 is connected to the additional input 10 of block 3. / Fig. 2 shows the most preferred embodiment of block 7 in the form of a series-connected input of a key of the 11-element 12 time delay for the return of the element 13 time delay for the operation of the element 14 time delay for the return with the inverse output and the winding / "i ffr i #" "" - 15 7 relay contact 16 which is connected in series with 17 otkoy output relay unit 7 In this actual body I may be formed, for example, a / 2 (as well as the elements 12,13,14 in) 3J. A description of the implementation of the harmless / predictable and useful model is given on the example of a device with a relay block 3 in the form shown in FIG. 3 and known, for example, from 2 (i.e., in the form of a winding 18 of the output (for block 3) relay. NO contact 19 L PBMFRK 20 pick-up relays With make contact 21, intermediate relay windings 22 with make contact 23, In this case, the newly introduced unit 7 is closed according to the scheme of Fig. 2, which operates as follows: Mode I, In the communication channel there is a continuous RF signal or RF signal with pauses, duration NOSTA lock angle which is less protection. Continuous RF signal in the communication channel corresponds to the absence of voltage at the input 8, the logical voltage edini11y (1,.) output from the switch II through the element 12 to the input element 13, 1 LLSA

An RF signal with pauses, the duration of which is less than the protection blocking angle, corresponds to the appearance of short-term voltage pulses at input 8, and at the output of switch II. - short-term voltage of logical zero (0, the duration of which is less than the delay time

to return element 12. On element 12, an extension occurs from the logical unit (, I) from the output of key II to

continuous on. the input of element 13. in any of the 2 above cases, the input of element 13 receives the voltage of the logical unit (I), Element 13 detects the presence of a continuous continuous voltage of logical C), and element 14, remembering the presence of voltage of logical I for a time of about 40 ms, provides its inverse output acts as a low voltage for the specified 40 ms. As a result, the relay with the winding operates and closes the con. - act 16, This leads to the excitation of the winding 17

WITH NOILIIKSH. K x- JJMiUULf (CiUI

and opening 1 Status 9 of block 7.

Mode 2, In the communication channel there is an RF signal with a frequency of at least at least the angle of protection blocking, or the absence of

RF signal in the communication channel.

The RF signal in the communication channel with pauses whose duration is not less than the angle of protection blocking corresponds to the appearance of voltage pulses at input 8, and at the output of key II, logical zero pulses O, the duration of which is longer than the time delay for the return of element 12,

//

At the input of the element 13, the logical O and I voltages alternate, and the duration of the logical I voltage is less than the time delay for the element to start working from the output of the element 13, the logical O voltage is supplied to the input of the element 14

The absence of the RF signal in the communication channel corresponds to a constant voltage at input 8, as a result, the voltage of the logic O from the output of the key II through the elements 12, 13 is fed to the input of the element 14,

That is, in both cases of mode 2, a logic O voltage is supplied to the input of element 14, while a high level voltage appears at the inverse output of element 14,

8resulting winding 15 remains de-energized, contact 16 is open, winding 17 is de-energized, and outputK} | Koptshst

9block 7 is closed.

So, the status of KOPTSHIROV 9 depends on the parameters of the RF signal in the communication channel, which allows using contacts 9 to accordingly control the operation of the output relay unit 3,

  The proposed device as a whole (Fig. 3) is installed at both ends of the protected overhead line and, taking into account the above-described action, the actual unit 7 operates. afterwards

In the absence of external and internal

Starting protection elements are not triggered, the RF transmitter is not started and there is no RF signal in the communication channel. Organ

I phase comparison not working, pin 5 open. Koptszht

9 block 7 is closed.

Positive (+) sagging circuit of the power supply to the windings

18,20,22 not collected. Pin 19 is open and there is no trip signal.

The device for differential-phase high-frequency protection of the power line is in its original state and ready for paj6oTe.

With internal short circuit

Depending on the type of short circuit, the corresponding starting protection elements are triggered to trip and lock.

The BCH transmitter starts up,

An RF signal appears in the communication channel with pauses, the duration of which is not less than the angle of protection blocking; so

pin 9 of block 7 remains closed,

Organ I works, closes contact 5 and through

input b. closed corresponding output by contact pusy-ldh 1st: / t-.

organs, Koptshs ZiE plus the power source is fed to the windings 18.20, U

The relay operates with a winding 18 and the closure of pin 19 acts on the circuit breaker circuit breaker,

The relay operates with a winding 20 and a short circuit, contact 21 picks up the supply ash + power supply to the windings 18.20,

Ptey external short circuit on adjacent OHL

i @ 7Co5

f (HL €

Treble transmitted chica,

An RF signal appears in the communication channel with pauses, the duration of which is less than the protection blocking angle,

Short current pulses flow through inputs 8 and 2, the duration of which is insufficient for the actuation of organ I, Contact 5 is open. And even in the case of the corresponding triggering organs to trip, plus the power source is not supplied to the output relay with winding 18.

Disabling does not occur.

With external faults on bypass connections

Corresponding trigger protection elements are triggered by a lock and the RF transmitter is started,

An RF signal appears in the communication channel with pauses, the duration of which is less than the angle of protection blocking. Short current pulses flow through the inputs 8 and 2, the duration of which is insufficient for the actuation of the organ I. Coptshst 5 is open.

Block 7 detects the presence of an RF signal with pauses, the duration of which is less than the blocking angle, which is affected. As a result

COPTS 9 opens.

The input b of block 3 with a sufficient level of short-circuit current can be closed through the output of the triggering organs of the switch.

As the experience of exploitation and theoretical analysis shows, when an external short circuit is disconnected on bypasses due to the features of the transition process in the network and the protection manipulation organ, pauses appear in the RF signal, the duration of which

not less than the angle of protection lock, which causes short-term

actuation of organ I and closure of smoke 5

The plus of the power supply is fed to the winding 22 of the intermediate relay, the response time of which with a safety factor is equal to the time spent finding conf

condition (organ I works briefly)

.ein

The contact oht opens earlier than the intermediate relays

with winding 22 manages to operate and apply V power supply to the output relay with winding 18.

Excessive shutdown of intact overhead lines does not occur. In case of internal IQ, which arose along with external short-circuit at bypass

connections.

As indicated by the user, “Power 9 is open. Plus source

power supply through a closed input 6, and smoked 5 cp§, which worked. body I is fed to the winding 22 of the intermediate relay, by closing contact 23 of which plus the power source is supplied

n winding 18 of the output relay. The KoiiTdicT 19 relay closes the circuit breaker trip. The relay with winding 20, when activated, picks up the supply + power supply circuit to the windings 18.20.

Industrial applicability

According to the circuit of FIG. I with the implementation of block 7 in accordance with figure 2 was assembled a device for differential-phase high-frequency protection B, I 110-220 kV.

Laboratory tests and studies on a digital mathematical model of a line with protection showed that the proposed circuit solution is an effective means of combating unnecessarily positive differential responses

W l

JZtf-fiCa fTMirj:.

phase high-frequency protection of overhead lines 110-500kV when short circuit is disconnected at bypass connections.

Moreover, the implementation of the block 7 according to the scheme of figure 2 additionally allows to increase the noise immunity, due to the galvanic isolation of the protection device from the transceiver, and reduce power consumption, as it ensures the absence of current through the windings of 15.17 electromagnetic relays in standby mode,

Utility Model Formula

I. A device for the differential-phase high-frequency flashing of the power line, containing a phase comparator whose input is intended to be connected to the current output of the RF signal receiver, a relay output unit, the first input of which is connected to the output of the phase comparing organ, and the second input is intended for connection to the output of the starting protection organs,

Characterized in that an external short-circuit lock block is inserted into it, and the relay output block is equipped with an additional input, while the input of the external short-circuit fixation block is connected in series with the input of the phase comparison unit, and the output of the external short-circuit lock block is connected to the additional input of the relay output block

2. The device according to claim I, characterized in that the external short-circuit fixation unit is made in the form of a series-connected input optronic key, an exposure element time m

Claims (2)

1. Device for differential-phase high-frequency protection of the power line, containing a phase comparison body, the input of which is designed to connect to the current output of the RF signal receiver, a relay output unit, the first input of which is connected to the output of the phase comparison body, and the second input is designed to connect to the output of the starting protection bodies, characterized in that an external short-circuit locking unit is inserted into it, and the relay output unit is equipped with an additional input, while the input of the external short-circuit locking unit the short circuit is connected in series with the input of the phase comparison body, and the output of the external short-circuit fixation unit is connected to the additional input of the relay output block. 2. The device according to claim 1, characterized in that the external short-circuit locking unit is made in the form of an input optical key, a return time delay element, a response time delay element, a return delay element with an inverse output and connected to the pole the power source of the intermediate relay winding, the make contact of which is connected in series with the output relay winding between the poles of the power source.