JPS61180522A - Differential 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 [Technical Field of the Invention] The present invention particularly relates to a differential relay system which is improved so as to avoid unnecessary red snapper due to errors or fluctuations generated inside the dual relay mechanism.

[Technical background of the invention and its problems]

There are a wide variety of relays for power system protection, and they are used for various purposes. For the same purpose, there is a high-flow differential coupling device with a high level of applicability.Among these high-flow differential coupling devices, the present invention is directed to a high-flow differential coupling device that uses a frequency modulated wave as a transmission means. The problems with the magnetic device (2) will be explained using a conventional example.

Figure 4 (2) shows a conventional current differential relay device, but this current differential relay device, for example, takes a two-terminal system as shown in Figure 5 (C2). A and the other terminal B (
The principle is to set up RY and RYB in the second joint, transmit the frequency modulation of the magnetic current conditions of the terminal and the other party's terminal, receive each signal, and combine and compare the spirits. of(
This is adopted as a flow differential joint viewing system.

This $4 figure (2, 4 power system Yojiju et al. 8 and 1 style (the amount of energy is metamorphosed into a thickness that is easy to handle in the relay device with auxiliary metamorphosis 41. This metamorphosed child χ1 Converter 2 converts the current r and r=magnetic power amount (two conversions).The converted voltage amount is
The signal is frequency-modulated by the frequency modulator 3 (2) and transmitted to the other terminal, and a predetermined transmission delay compensation port (11j), & is introduced to correct the transmission delay.

On the other hand, the nine-frequency value modulated wave transmitted from the other terminal is received by the continuous abrasive surface and then detected by the abrasive pressure converter 5.

The outputs of the transmission delay compensation circuit 4 and the frequency-voltage converter 5 are connected to DC blocking Lgl paths 6-1.6, respectively.
-2 to cut the DC surge generated from each output. The outputs of the DC component blocking circuits 6-1 and 6-2 are summed and summed by a summation device 7, and the outputs are subjected to a band current level judgment by a judgment circuit 8. There is.

In this way (= configured, /c joint grinding direct,
In order to improve reliability (two inspection functions are usually added). It shows.

In FIG. 6 (2), the same parts as in FIG.
A switch circuit that opens and closes under the control condition of 0 is shown. 9-
1.9-2 is when the control condition is "M" (2 [open] (1 at steady state)
69.9-3 is when the control condition is “Yes” (2 “Closed”).
This switch circuit 9-3 is connected to the inspection precaution source 11 as an input. Its role is to flow a test magnetic current to the auxiliary transformer 12.

Here, we will explain the viscous abrasive aV shown in Fig. 6. First of all, I would like to explain about the foot constant. The current gradient obtained by transmuting the system magnetic current is converted to the magnetic pressure t (=. This voltage amount is determined by the amount proportional to the system magnetic current (2). This voltage amount is calculated as the sulfur pressure cycle inverse number It is modulated by converter 3. This modulation circuit
Figure at: Input with magnetic pressure V-frequency F characteristics as shown (
1 It has the ability to instantaneously (=this (=frequency (=according to)) convert.

This frequency modulation output is further transmitted by a transmission means (not shown).
The signal is sent to the other party's terminal (=transmitted. The other party's terminal receives this and performs a temporary adjustment of the frequency A-to-electrical ratio transformer (2, 2) similar to block 5 in Figure 6.

Figure 7b (showing two frequency F-magnetic pressure V characteristics).

A switch circuit 9 converts the magnetic output voltage obtained by adjusting the received wave and the voltage amount obtained by compensating for the delay (transmission delay) in the transmission delay compensation circuit 4 of the received wave from the fc trace Ith amount obtained from the Jiriya flow.
-1.9-2 through DC blocker circuit 6-1.6-21
Introduce Z. The DC component blocking circuits 9-1 and 9-2 are configured to block DC components that are likely to occur up to the preceding stage circuit (for example, in the modulation/demodulation Lgl path, a minute deviation of the center frequency 10 of the grinding-frequency converter is detected). =.

cut out the alternating current (= the purpose of responding (
i was inserted twice! ll! Get it in one pass. Then, after passing through the DC component blocking circuits 9-1 and 9-2, sweet and acid are added.

Such a configuration (2, for example, 2 with 2 C in Figure 5)
Terminal system (for 2, 4-tail current (tidal current or external accident magnetic current)) (for 2, the composite addition circuit output becomes zero, fault-flow within the protected area (for 2, a composite addition output occurs, By exploiting this, it is a differential bias device that operates as a relay device.

Next, we will explain the case in which the control condition is taken into account.The control conditions are as described above. After that, for example, the switch circuit 9-3 is controlled to be closed or closed.By performing this operation, the self-end magnetic current changes and a differential magnetic cover is generated, making it possible to inspect the self-end. By the way, when inspecting one's own terminal, the magnetic current equivalent to one's own terminal is shifted to the other terminal (two pairs).
There will be two movements. This is inconvenient.

Therefore, the transmission means (not shown) activates the control circuit of the other terminal relay device, opens the switch LgJ path 9-1. The amount of magnetism is set to zero and the relay device is controlled to be inoperative.

The G-Tun device that performs the above-mentioned response (2) and the problems that occur during inspection (2) will be explained next (2).

At the time of inspection (2), the switch circuit is opened for both the own terminal and other terminals, and after the inspection (2) this is closed, but for the sake of simplicity (2, Figure 5 (2) We will discuss the case where the power flow is not taken into account in the system.The problem described here is the case in which the DC blocking circuit 6-1.6-2, or in other words, the switch circuit 9-1.9-2, with and without DC component and between switch circuit 1", "
This is the response of the immediate L-minute blocking circuit 16 when "closed" (this is the response of the circuit after the adder Igl circuit).

First, when the DC component is not generated, the DC component ml stop circuit is also activated and the switch circuit 9-1
．． Even if 9-2 is closed by rt, mJ, r, the output response waveform of 7 is not facilitated. However, due to the above-mentioned reasons (2), for example, when two DC components are generated at the communication section input 1141+ and the DC component blocking circuit 6-1, 6-2 is activated to cut off the DC, the switch rotation J49-1° 9-2 + rH
J, rffiJ, 1. (:,/chil!21w
When the input to the DC component blocking circuit 6-1 suddenly changes, the DC component blocking circuit 9-1 responds differently from the normal state in response to the input (1).

We will now explain these situations using waveforms.

The response waveforms in FIG. 8a (with no DC component) and FIG. 8B (with 200 DC components) will be explained.

The waveform (a) in Figure 8a (=) shows the input magnetic current. This magnetic quantity is modulated by the frequency mantissa and becomes a waveform (-) (2. It passes through the transmission delay compensation circuit 4 and becomes a waveform (2). Rei Demeru.

- 10,000, receives the waveform (E) modulated from the other terminal,
When it is demodulated and becomes the 10 waveform (2), the zero waveform (2) and the waveform (2) are converted to -f: switch circuit 9-1, respectively.
．． 9-2 DC component blocking circuit 6-1, 6-2 also outputs a half output, and the DC component blocking output becomes waveform (G) and waveform (H), respectively.The output of adder 7, which combines these, also has waveform ( Therefore, even if this is passed through the switch circuit 8, it becomes a waveform (nu), and no relay output is generated in this field. , and it is normal to create a configuration that uses this condition as a lock, but of course in this case (=
Even if the waveform (Te) is set, it does not produce two outputs.

FIG. 8b (in the case of DC component M, concrete (2) demodulation circuit section (2) shows the response waveform on the assumption that a DC voltage is generated.

Waveforms (A) to (E) are the same as the 4th waveform in FIG. 8a. However, as shown in the reconnaissance circuit output (2 waveforms) (2), when a DC voltage is generated, the inspection command condition waveform (2)
(If the switch Lgl path is opened/closed from -, the output of 7 will be ``open'' and ``close'' of the switch circuit respectively (2). (If you combine the two, it will look like a waveform (su) (29).
If you add them together, you will get a waveform (nu) output as a magnetic relay.

As mentioned above, it is normal to think of locking the relay device output under the inspection condition by combining the inspection instruction conditions, but even if this condition is combined, the inspection condition will not return. Later, as shown in the waveform (wo), a temporary output is generated (=).

This malfunction current urine has been inspected and examined (two lock time) (
Although it is possible to deal with this by keeping it.

In this case, the lock time is not necessary (2), and even the inspection time is shortened as much as possible, the operation time of the power line chief is increased, and the request from the device (2) cannot be answered.

[Purpose of the invention]

The purpose of the present invention is to avoid prolonging the lock time (=,
Provided is a differential relay device that responds to minute DC components≦2 (there are two).

[Summary of the invention]

Main departure c! The differential relay device according to A has a circuit that stores the DC component. The circuit is characterized in that the circuit is designed so that it does not occur.

[Embodiments of the invention]

Hereinafter, the present invention will be described with reference to the embodiment shown in FIG. 1 (2). In FIG. In the figure, the circuit that has retreated is the switch circuit 9-4 in Figure 6.
9-6, and the t-minute storage circuits 12-1 and 12-2. The switch circuits 9-4 and 9-5 operate so that they are always "closed" and "open" during inspection, and the switch circuits 9-6 and 9-7 are "1 open" when they are closed and "I-closed" when they are inspected. .

Further, the DC component storage circuit 12-1, 12-2, for example,
It is a circuit that shows the frequency customization in Figure 2, and has characteristics that respond to DC input.The transmission delay compensation circuit 4 and the frequency-soil supply circuit The output stages of the DC storage circuits 12-1 and 12-2 are connected to the switch circuit 9-6. .9-7, and its output becomes the input of each of the DC component blocking circuits 6-1 and 6-2, and the rest is the same as the circuit configuration shown in FIG.

In this way, the differential relay t? of the present invention and the direct excitation C are two. Corresponding waveform (A) ~
There is no change in the waveforms up to (2), that is, the output waveform (2) of the transmission delay circuit 4 and the output waveform (2) of the frequency If converter 5. This shows that during the inspection conditions (bi-waveform) (
Second control IP! l road 13 (two') ri control C two people. By the way, the control including the switch circuit 9-1.9-4.9-6 and the DC component storage circuit 12-1 is performed by the switch circuit 9-1.
2゜9-5. It is exactly the same as the control including 9-7 and DC distribution 11 circuit 12-2. The circuit response for the assumed receiving system (:) will be explained.

Frequency @tj: The converter 5 generates a converter flow, and this output is always generated because the switch circuit 9-2.9-5 is closed and the switch circuit 9-7 is open. Following the switch circuit 9-2, there is a DC component blocking circuit 6-2 (2 inputs), and a DC component storage circuit 12-2 (2 normal (- continuous storage state). The response waveform is the input waveform of the DC component blocking circuit 6-2 as shown in Figure 3 (1).
), DC portion memory I! The output waveform of the 21st path 12-2 is
Assuming the waveform in the figure (Ma), the waveform in Figure 8 from the waveform (A) also includes the waveform at the same position as in Figure 3 (= as shown in (2).

It goes without saying that the output of the DC component memory circuit U-2 is adjusted to have the same size as the input of the regular DC component blocking circuit 6-2. .

When inspection is started from the above condition, the switch circuits 9-2 and 9-5 are opened and the switch circuit 9-7 is closed, and the input of the DC component blocking circuit 6-2 is connected to the frequency-to-voltage ratio converter 5. The output of the DC component storage circuit 12-2 is added to the output of the DC component storage circuit 12-2 through the switch circuit 9-7 (2). Since the output (DC voltage) of the voltage converter 5 and the output (DC voltage) of the DC component memory circuit 12-2 are of the same magnitude, there is no change even after checking and switching, and the waveform (4) does not pass. 9 (Second.

Therefore, since the input of the DC blocker circuit 6-2 remains unchanged,
The circuit continues to operate and its output does not change.In this state, the inspection progresses and the inspection is completed.
are in the opposite open and closed positions, returning to their normal state (=returning. At this point, the input to the DC component blocking rotation 6-2 does not change, and its output also does not change (=does not change. Therefore, the joint '@ device As shown in Fig. 3, the waveforms (g) to helical (wo) (= As shown, there is no output from the adder 7, so there is no ia operation. In other words, in Fig. 8 a, the DC component is If we consider a situation in which it does not occur, it is equivalent to an isopod, and the occurrence of the problem has been eliminated (second term).

What has been described so far has been explained assuming that the frequency-voltage converter 5 (= produces a DC component output), but only this circuit (2 is not satisfied, and the circuit of AiI (= or The present invention is applicable even if the content (=) in which a DC component is generated is
Matataden: i! :! Even if there is similar dirt and urine on the side of the compensation circuit 4, it goes without saying that the former and the latter C2 (2) can also be used.

[Effects of the Invention J] As described above, in the present invention (=), the constantly occurring DC @ ratio is memorized and switched from the actual circuit at the time of inspection.

In order to apply the memorized voltage to the lever, it is possible to eliminate the change in the input of the M stop circuit at the time of switching (two DC components).
You can avoid unnecessary reactions.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing one embodiment of Honhatsu's follow-on magnetic relay device, and Figure 2 is a characteristic diagram of its internal circuit. Response waveform diagram of the internal circuit, Figure 4 is a block diagram of the single magnetic current differential relay 4, Figure 5 is a side view of the application of the differential relay device to the system, Figure 71.Aa
and b are characteristic diagrams of the modulator + "f summer glassware, and Figures 8a and b are response waveform diagrams of the conventional overflow differential g-ton device. 2... - Round sharpening positive converter 3. ...Shu Todo He number converter 4
... Transmission delay compensation circuit 5 ... Frequency i positive converter 6
-1.6-2...DC blocker circuit 7...Adder 8...Method circuit 9-1.9-7...Switch circuit 10...Air source for inspection 11... Auxiliary transformer 1
2-1, 12-2 DC division filter circuit 13... Control a circuit (8733) Agent Patent attorney Sho Inomata
Akira (and 1 other person) Fig. 3, f Shiba, force 1 (in □ λ (1 cedar) D-------------bu 艷＠ dtsu □ liquid f1//(force □ Figure 4 Figure 5 @ Figure 6 Figure 7 ζm (b) (Otsu l) tb
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1 ≧ (Tofu □ #5 (Tsuno □ Jθ to 3 (Wono-1-11-Procedural amendment writing method) % expression % 1. Case display special Application No. 5959-2O982 9, Name of the invention Differential relay device 3, Relationship to the amended case Patent applicant (307) Toshiba Corporation 4, Agent 1-9-10 Toranomon, Minato-ku, Tokyo 105 Japan No. February 25, 1988 (shipment date) 6. Subject of amendment 1, Brief description of drawings in the specification column 7, Contents of amendment 1, No. 9 on page 15 of the specification of the present application Line ``
"Application side diagram" is corrected to "Application example diagram." 2. The following description is added between page 15, line 9 of the same specification, 1...Application example diagram,'' and ``Figure 7 a.''"Figure 6 is a block diagram showing a relay device with an inspection function added."

Claims (2)

[Claims] (1) A circuit that introduces an amount of electricity from the power system, modulates it, transmits it, and brings that amount of electricity to a DC blocking circuit through a transmission delay compensation circuit, and a circuit that demodulates the received modulated wave and sends it to the DC blocking circuit. In a differential relay device that combines the outputs of both circuits and makes a determination, a DC component storage circuit is provided at the front stage of each of the DC blocking circuits to constantly store the DC component, and further usually, A differential relay device characterized in that the DC component storage circuit is bypassed, the bypass circuit is opened under certain control conditions, and the output of the DC component storage circuit is applied as an input to a DC blocking circuit. (2) The differential relay device according to claim 1, characterized in that the output of the DC component storage circuit is applied as an input to the DC blocking circuit when inspecting the circuit.