JPS58139633A - Distance relay unit - 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 The present invention is directed to a distance 74 device that operates by the ratio of voltage to 4151, or impedance.

A conventional example of this type of device is the one shown in FIG. The figure shows a seven-type distance control device that determines the phase relationship and responds. (1) is the voltage input quadramp, (2) is the can inflow quadrangle, and (2a) is the secondary side of the current input quadramp (2). (3) is a memory circuit that stores the input voltage before the failure occurs when the power can pressure V suddenly changes to zero under the circuit conditions of short circuit and 4i1111i; (5a
) Ba cloth) is a waveform shaping that creates a positive polarity signal (one, demand (“0”) square wave 1f No. θl, “fi” according to the polarity of the composite quantity El − − V and the polarity of −V − ZaI). The circuit (6) is a phase detection circuit that separates the phase relationship between the composite quantity ffi and - by #a, and for example, it obtains an output only when the square wave signals el and θ voltage are both l゛, and determines the magnitude of this output. The functions are classified by the length of time 11. That is, if it continues for a period longer than time 114 and a specific output is obtained, it is activated, otherwise it is inactivated, and the phase angle is set to 1 so that the phase angle is θ-±9. Select 5 and set the phase angle θ−±
It operates when it is within 90'. In (1) to (6) above, the distance -
It constitutes 4 main systems (71. (8) is a distance relay element (
71 requires an overcurrent relay I4 to prevent malfunction due to unstable operation in the small 11EIj1 failure area, and the C system has a distance of 1111m.
Both the main text (7) and the supercan II relay main text (8J) are AND circuits that operate at 5C and output only when they are connected.

Next, the operation will be explained. Figure 2 shows the distance S
This is a Moh type phase characteristic that represents the operating principle of +71 as a voltage vector. Vector El=-y and vector gQ-v-
Since the range where the angle formed with the zs work is smaller than 90 @ is the range of motion of the distance joint heel center (7), the vector z8 work is 1
A characteristic characterized by the fact that the vector El falls within the circle with the radius is obtained. For example, (I) in the case of a forward external fault (fault voltage Vl), the phase angle θl of vector Ill and vector E111 is > 90°, resulting in no operation; @) in the case of a limit point fault (fault voltage v2), the phase angle θ3 of vector K11l and vector Ba1l -90° and t limit, @) In case of internal fault (fault voltage V3), the phase angle θ3 (90”) of vector [15 and vector E15 becomes operational, and in case of external fault (fault voltage V4 kqO) behind vector E1 . and the vector has a phase angle of 24, θ6>90°, and is inoperative.

Here, the settling impedance z8 is the non-impedance ZI in the maintenance section, the two points, Zs -xlzL (Kl
C is a proportionality constant, generally set by Kl k-ao·8).

Figure 3 shows the distance 1 in the case of an internal fault (fault voltage V5).
The waveform shaping circuit (5a), (a) of the 1d4 element (7) and the output state of the position detection circuit tIII (6J) are checked.This final output and the fault that has occurred in the system can be detected, and the
! The detection level of its input current is set so as not to operate in the ttllL fault region.
The distance is 11i with the AND condition! −゛The can device is operational.

However, the input 'pressure V of the distance [44 main system 171] is converted to the capacitor type tia transformer 1! (FD), when a sudden change occurs in the primary voltage of the transformer, a transient phenomenon occurs in which the If flowing acid component, which attenuates over time, is directly applied to the AC component of the secondary voltage. Occur. This means that when the primary side voltage of a capacitor-type potential transformer suddenly changes to zero, for example, 1liil(
Considering the fault voltage N'a = O), as shown in FIG. 4, the AC component of the fault voltage v4 is zero, but the DC voltage Vda bl iA is caused by a transient phenomenon. Then, the DC voltage vdc is larger than the fault current can voltage drop z8, and the composite cover Km -V -2B is offset by the DC component Vda, and the square wave signal 011
As shown in the figure, an error is inserted into the signal width, and the next stage phase detection circuit (
6) may cause malfunction. At this time, the over-attptasi main system (8
Since distance 3 also operates, the distance 4 device will malfunction due to a failure outside the protected area.

One possible way to prevent this is to increase the setting level of the overcurrent tIL relay element (input 81, 4th flow).
This impairs the failure detection sensitivity and is not a practical solution.

Since the conventional 44-vehicle installation is configured as described above, if the input voltage is introduced through a capacitor-type voltage transformer, external failures due to transient phenomena of the capacitor-type voltage transformer will occur. It had the drawback of malfunctioning.

This invention has been made to eliminate the drawbacks of the conventional ones as mentioned above, and it is designed to provide an overcurrent power supply system that responds when the input current exceeds a level set in inverse proportion to the settling impedance. By doing so, it is an object of the present invention to provide a distance relay device that can prevent entertainment caused by transient phenomena in the voltage derived from a capacitor transformer.

An embodiment of the present invention will be described below with reference to the drawings. Fifth
In the figure, the light indicates that the input canister has a setting impedance zs
This is an overcurrent d4 key tree that is set in inverse proportion to and responds when it is at level 9 or above.

In other words, since the influence of the transient phenomenon appears in the output of the composite circuit t6f41 -= V -ZB as shown in FIG. If it is large enough compared to
It is theoretically possible to obtain a nearly stable synthetic lid Es-V-ZsXI) waveform. If you pay attention to this point, vo
As the production voltage, 28T≧To ) Vdc, I! &a
x (vaa, max is the maximum value that can occur for I [fi voltage V■), if overcurrent a4 main system LM is operated only when -, malfunction of distance relay 4 element (7) can be prevented by AND condition. This means that the logical product times Wr (91) can be prevented.

Here, let us consider its application to the power system shown in Fig. 6.

zB is the back impedance and can be set as ZB- and ZL (KQ is a proportionality constant, generally 2≦10). In addition, if En is the rated pressure (generally 63.5V) seen from the secondary side power of the capacitor-type potential transformer (PD), failure 4
She has a flowing knee □. Therefore, since ZB+ZII>ZB+Z11 zs, but s In >> Vo, if the 瀘闫 Flow-Kan Requisition Scream operates under the conditions of input 闫fit <i 工, Vc-, 8 will occur within the protected area. It can be said that it can respond to all types of failures. For example, the DC voltage V of a transient phenomenon
Considering eLa and rmx, if the detection pressure Vo is set to 4'V in order to obtain a stable nine-metal construction i, then the voltage is z8 and 24V. At that time, liquid ejection within the protected area
Even if force is generated, In-63, 57, ZB-10ZI,
, z11 knee 4.7V (≧
4V), which can be used sufficiently as the sensitivity of general OX power systems.

Next, the operation of the embodiment will be explained. distance 4 electric device t7
The operation of 3 is the same as conventional 9, and when the input voltage V is introduced via a capacitor-type voltage transformer, if a malfunction occurs with the DC voltage Vdc due to a transient phenomenon at the time of a sudden voltage change, the DC voltage Vdc will change. Input 1 that only cancels the effect
Since the input current I with a voltage drop of z8 or higher in the TFT does not flow, the overcurrent 4-power call does not work, and therefore the logic is reversed.
I! Since rT91 is closed up to 7tt, the distance relay 4 device does not operate. Conventional methods apply to internal failures.

In the above embodiment, the input current of the overcurrent requirement 4 is detected as the secondary output of the current type cadence (2) as ZBI 2O vo, that is, −≧τ, and the input current is detected as shown in Fig. 47. Setting impedance X Z as direct machining
The gap (2a) for deriving , and the gap (m) for deriving the interlocking point B may be attached to the gap (2a) for deriving the interlocking function B.

Further, in the above embodiment, a four-distance electric device with a Moh type phase characteristic was explained, but an offset Moh type.

Impedance type, offset impedance type.

A distance $111 coupling device such as a reactance type phase characteristic may be used, and the same effect as the above embodiment can be obtained.

In the above example, the setting impetance of gap (2a) is Z8 1.2, 4.8.160.
It goes without saying that any value may be used for N6.

As described above, the present invention is configured to respond when the input current exceeds a level set in inverse proportion to the settling impedance. Therefore, 1ml of malfunction prevention due to voltage transient phenomena derived from a capacitor-type potential transformer! Made of military composition, high confidence,
This has the effect of providing high sensitivity.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing a conventional distance relay device, Figure 2 is a voltage vector representation of the operating principle of the distance relay element and a phase characteristic diagram, and Figure 3 is a case where an internal failure occurs in the protection section. ,
The output state diagram of the waveform shaping circuit and phase detection circuit, FIG. 4, shows the synthesis circuit and waveform shaping l! in the case of an external failure at the close point behind a transient phenomenon. l! 5 is a block diagram showing an embodiment of the 1 l l l l joint 41j & la 4 device according to the present invention, Fig. 6 is a power system diagram, and Fig. FIG. 2 is a block diagram showing one embodiment of the present invention. In the figure, (1) is a can press-fit quadrant, (2) is a 4f
i input quadrance, (2a) is the gap, (3) is the memory circuit, (4) is the synthesis circuit, (5!L) + (5b) is the waveform shaping circuit, (t1th imaginary phase detection circuit, (7) is Said (
11 to (6), (9) is an AND circuit, and (9) is a 44-flow relay element. In addition, V is the input voltage, g is the input current, zs is the setting impedance, and g
l and gll are synthetic violet signals, and ei and ea are square wave signals. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno - Figure 1 Figure 2 Figure 3 Figure 1-4 Late HI! Me - Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A distance 4' element that reacts by comparing the impedance obtained from the system voltage and system current derived from the capacitor-type potential transformer with a setting impedance, and a level at which the input current is set in inverse proportion to the setting impedance. A nine-distance relay device comprising a four-way relay element that responds when the current is above, and an AND circuit whose inputs are the output of the four-way relay element and the output of the distance J4 element.