JPS63157611A - Protective relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a protective relay device that determines the direction of an accident using a directional relay.

(Prior Art) FIG. 3 shows a two-terminal power system diagram, and FIG. 4 shows an RX diagram of an internal direction detection relay Sr and an external direction detection relay SO.

In Figure 3, E^ and En are the back power sources of the A and 8 electric stations, respectively, l”out is the failure point behind the B end, Fin is the internal failure between A1BM1, and SIA is installed at the Aif point. SO^ is the outward detection relay installed at the AM electric station, 5O11 is the outward detection relay installed at the 8! point, and S18 is the inward detection relay installed at the B electric station. .

The phase characteristics of the st, , and so relays are as shown in FIG. In a system configured with such devices, in the event of an external failure at FOut in Figure 3, the 4th
As is clear from the phase characteristics in the figure, Sl, , SO8 operate.

At the All Station, the fault is determined to be inward by the operation of 81^, but at the Nichiden Electric Works, it is determined to be an outward fault by the action of SOB, and a transmission means (not shown) is used to transmit the fault to the A end in the outward direction. To transmit that there is a malfunction,
At the A-end electrical station, unnecessary shutoffs are not performed due to the conditions of SIA, 308.

On the other hand, at the elf point, an outward failure is determined by the operation in S08, and therefore, unnecessary cutoff is not performed as in the case of the A end.

Here, when considering the time coordination of the SIn 1Son direction relay, the following results are obtained.

Figure 5(a) is a vector diagram of the Sl relay, Figure 5(b)
) is a vector diagram of the SO relay, FIG. 6(a) is a block diagram of the Sl relay, and FIG. 6(b) is a block diagram of the SO relay.

In FIG. 5(a), ■ is the amount of current introduced from the grid, 12. is the vector quantity derived from I, and ■ is the voltage quantity introduced from the grid.

Here, in the phase comparison of the vector l112-V of the difference between IZ and V and ■, in the case of an SI array configured to operate when the phase difference θ between IZ-V and ■ is within 90 degrees, the fifth The phase characteristics shown in Figure (a) are obtained.

In FIG. 6(a), ■ and ■ are respectively the input transformer T1,
It is converted into IZ and ■ via T2 and the connected resistors R1 and Rz, and then a composite vector quantity of 12-V is obtained, which is introduced into the AND circuit and the inverter circuit via the square wave conversion circuits BF, BF2. Ru.

IZ-V! : V 17) AND output [(1, Z-
V) ・V ] P and [(IZ-V) ・V ] N are ORed into the circuit, and IZ-V,! : The time period during which V has the same polarity is determined by the time-limited operation circuit ■O[, and when this is 1/4 cycle (90 degrees in electrical angle), an intermittent signal is output, and the time-limited return circuit TDD is introduced to continuously operate. Output as a signal.

With the above configuration, the phase determination of 12-V and (2) is performed once every half cycle.

Next, the SO illustrated in FIG. 5, (b) and FIG. 6(b)
Explain about relays.

In FIG. 5(b), ■ is the amount of current introduced from the grid, 111 and IZ2 are vector quantities derived from ■, and ■ is the amount of voltage introduced from the grid.

Kokote, IZl, IZ2 ToV (7)! 'Go to (7)'
) To/LzffilZ1-L! :V-IZ2 (7) It is suitable for phase comparison, IZl-V to V-IZ2 phase difference θ is 9
In the case of an SO relay configured to operate when the angle is within 0°, the phase characteristic shown in FIG. 5(b) is obtained.

In FIG. 6(b), ■ and ■ are respectively input transformers T1,
TIZl through T2 and resistors R1 and R2 connected to it.
, 122 and ■, and furthermore, IZl -V and V-
Obtaining the composite vector quantity of IZ2, square wave conversion circuit BF,
, BF2, and are introduced into the AND circuit and the inverter circuit.

1'Z1-vtoV-IZz (7) AND output [(IZ
l-V) ・(V-122)IP ト[('IZt -
V) ・(V-IZ2)IN is introduced into the OR1 circuit, and the time period during which IZl-V and V-122 have the same polarity is determined by the time-limited operation circuit TDE. 90°), it outputs an intermittent signal, which is introduced into the timed return circuit TOO and output as a continuous signal.

By configuring as above, IZ, -V and V-
'IZ2 phase determination is performed once every half cycle.

Next, the operating time of the 31 relay and SO relay will be considered.

FIG. 7 shows a time chart of the 81 relay configured as shown in FIG. 6 (al).

In Fig. 7, the AND“ output of 12-V and ■ is [(I
Z-V) ・V]P and Hi [(IZ-V) ・VAN
The time width of each signal is illustrated in FIG. 6(a).

If there is more than 1/4 cycle of time determined by TOE, T
The DE produces an intermittent output, which is converted to a continuous signal by the TDD's timed return timer.

(Problem to be Solved by the Invention) Here, the amount of electricity of 12-V or ■ is generally passed through a filter circuit, which is not shown in FIG. The output signal does not instantaneously follow the primary input signal.

Therefore, as illustrated in FIG.
-v)·V] A case occurs in which the width co of P cannot be obtained for 174 cycles.

In this case, the output of the time-limited return circuit TOO, that is, the output of the Sl relay, will be delayed by half a wave.

The operating time of the SO relay also causes a phenomenon similar to that of the SL relay described above.

The time charts are shown in Figures 9 and 10.
Since the explanation can be made in the same manner as in FIG. 8 and FIG. 8, the explanation will be omitted here.

In the one-way direction comparison relay system using the SO relay configured as described above, formula (1) must hold in order to avoid mistrips in the event of an external failure.

31 operating time > 30 operating time 10 td...(1
) td: Transmission delay time 31 Operating time 2 0.5 cycles to 1 cycle SO operation [: 0.5 cycles to 1 cycle The worst condition in equation (1) is shown by equation (2).

Therefore, in order to avoid mistrip in equation (2) when an external failure occurs, it is necessary to add time to the internal detection relay as in equation (3).

This is clearly undesirable since it leads to a delay in trip time in the event of an internal failure.

SI operation time (0,5 cycles) > So operation time (1 cycle) + td ... (2) 31 operation time + t > 30 operation time + td ... (3) (=
SO operating time-aX-3 amount ff! lm1n =
o, s cycle The present invention was made to solve the above-mentioned problems, and aims to provide a protective relay device that shortens the trip completion time for a one-way directional comparison relay by increasing the speed of the directional relay. Purpose and purpose.

[Configuration of the Invention (Means for Solving Problems) The present invention will be explained using FIG. 1 corresponding to an embodiment.
The present invention derives a two-layer vector quantity based on the quantity of electricity introduced from the protected object, and outputs a second layer element when the time during which the vectors 6 of 2Jl both have the same polarity exceeds a predetermined value. (part A), and a second element (part 8) that is output when the time during which the vector quantities of the two layers have different polarities is within the predetermined value, The configuration is such that the logical sum output with the second element is used as the operational output.

(Function) Therefore, as in the past, following the motion determination during the time when the polarity is the same, the motion determination during the time when the polarity is different is also performed, which shortens the determination time and reduces the possibility of erroneous determination. It disappears.

(Example) An example will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a protective relay device according to the present invention, and FIGS. 2(a) and 2(b) show time charts.

In FIG. 1, the block diagram of the portion A surrounded by the dashed-dotted line is the same as that described in the section of the conventional device, and therefore the description thereof will be omitted here.

In this embodiment, in addition to the above configuration, 12-V itself and the inverted signal of the V square wave signal are input to AND4, and furthermore, 12-V itself and the inverted signal of the tZ-V square wave signal are input to AND4. AND3 input, and each of the above signals is OR2
Introduce it into the circuit.

One of the outputs of the OR2 circuit is input to the holding circuit F/F, and the other is one output via the time-limited operation circuit TDE2, the inverter circuit N0T3, and the time-limited operation circuit TDE.
Each of these outputs was introduced into an OR3 circuit, and the output of this OR3 circuit was used as a reset signal for the above-mentioned holding circuit F/F.

Then, the output signal of the holding circuit F/F is
The output was configured to be used as a relay output signal via the TOE4. Note that the parts added in the present invention are shown as part 8.

Next, the operation will be explained using the block diagram in FIG. 1 and the time charts in FIGS. 2(a) and 2(b).

Figure 2 (a) is a time chart when the direction relay is in operation;
FIG. 2(b) is a time chart when the direction relay is not operating.

The time period shown as (a) in Figure 2 (a) is A in Figure 1.
Judgment is made using the elements of the layer shown in the section. Regarding this part,
Since this is the same as that described for the conventional device, the explanation will be omitted.

In other words, the time during which (IZ-V) and ■ have the same polarity (
(a) time period) is determined by the time-limited operation circuit TOE,
If there are 4 cycles or more (90 degrees in electrical angle), an intermittent signal is output once every half cycle, and this is the time-limited return circuit TDD1.
A continuous "1" signal is obtained by performing one cycle extension determined by .

On the other hand, the second element (component added in the present invention) is (
12-V) itself and the inverted signal (■) have the same polarity.
The OR signal of the output of is obtained by the OR2 circuit.

One of the output signals of the OR2 circuit is held by a holding circuit F/F, and when the signal of this OR2 circuit is less than 1/4 cycle determined by the time-limiting operation circuit TDE2, the time-limiting operation circuit T
The output of DE2 is a continuous rOJ signal.

In addition, in this case, the output of the time-limiting operation circuit TDE3 is OR2
The time during which the output of the circuit is rOJ is the time limit operation circuit TO
Since there is no more than one cycle determined by E3, the holding circuit F/F
Both reset signals are not established.

Therefore, the output of the holding circuit F/F is held at the "1" side while the output of the OR2 circuit is outputting an intermittent signal, and after 1/4 cycle determined by the time-limited operation circuit ■θE4, the direction relay is activated. Output a signal.

In this case, the reset of the holding circuit F/F is (IZ-V)-
This is done when the V + H (IZ-V) -V (7) OR signal continues for one or more cycles determined by the time-limited operation circuit TOE3 after it becomes "0".

The time zone (a) in FIG. 2(b) is determined by the elements of the layer shown in part A of FIG. 1. This part is the same as that described for the conventional device, so the explanation will be omitted.

In other words, the time when (12-V) and (1) have the same polarity (the time period (a)) is determined by the time-limited operation circuit TDE.
'/4 cycles or less, each time-limited return circuit ■00
The output of the layer is a continuous "0" signal.

On the other hand, the second element (component added in the present invention) is
(12-V) and the inverted signal (■) have the same polarity using AND3, and then
The OR signal of the outputs of 4 is obtained by the OR2 circuit.

One of the output signals of the OR2 circuit is temporarily held in the holding circuit F/F, but it becomes an intermittent signal because it is reset when there is an output from the time-limited operation circuit TOE2.

Therefore, there is no signal for more than 1/4 cycle determined by the time limit operation circuit TDE4 (and the output of the time limit operation circuit TOE4 also becomes a continuous "0" signal).

With the configuration described above, in the conventional device, the operation could not be determined until at least 1/2 cycle had passed after the occurrence of a failure, but by using the present invention, the operation can be determined in about 1/4 cycle. It turns out that it can be determined.

Therefore, the time t shown in equation (3) is given below,
This leads to faster trip times.

t=SO operating time max -8r operating time min =0
．． 5 Sai, Crew 0.25 cycle = 0.25 cycle [Effect of the invention] As explained above, according to the present invention, the vector quantity of 21 layers is derived using the electric quantity taken from the protected object, and this vector quantity Since the operation is determined based on the time when the polarities are the same and the time when the polarities are different from each other, it is possible to provide a protective relay device with shortened operating time.

[Brief explanation of the drawing]

Fig. 1 is a block configuration diagram of an embodiment of the protective relay device according to the present invention, Fig. 2 (a) and (b) are time charts of the device of the present invention, Fig. 3 is a two-terminal system diagram, and Fig. 4 are the R-X diagrams of the inward relay and outward relay, Fig. 5(a), (
b) is a vector diagram of an inward relay and an outward relay,
Figures 6(a) and (b) are block diagrams of the conventional device, Figure 7 is a time chart of the inward relay, and Figure 8 shows the delay in the operation of the inward relay due to input through the filter circuit. FIG. 9 is a time chart of the outward relay, and FIG. 10 is a time chart showing that the operation of the outward relay is delayed by the input through the filter circuit. AND, ~ND4...AND circuit OR, ~OR4...OR circuit TOE, ~TDE4...Time-limited operation circuit TDD1...
Timed return circuit

Claims (1)

[Claims] In a protective relay device that introduces electric quantities from a protected object, derives two-layer vector quantities using these electric quantities, and performs operation determination using these two-layer vector quantities, the two-layer a first element that is output when the time during which both vector quantities have the same polarity exists for a predetermined value or more;
and a second element that outputs when the time during which the vector quantities of the two layers have different polarities is within the predetermined value, and operates to output a logical sum of the first element and the second element. A protective relay device characterized by being an output.