JPS59213223A - Distance 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 Seimei] The present invention (1. Distance 1 @ joint's divination machine, removes the fault of '11' force system 11 which has frequency fluctuation at 4 o'clock, and performs its protective operation. Stable operation 1) (It concerns a slightly distance Pa relay).

1 branch of the 4 brothers: iCI's Katasu] 斤'1Eiii, , JJ Itoharu has become larger and more complex, and its protection has also become more sophisticated. Toriwa V
)'+l Here, the conventional technology will be explained.The conventional technology from 1N to 3Q (1?) is a representative model of relay, the Moh type distance relay. It is.

Figure 131 is a block diagram showing a Moh type distance relay, the second
The figure shows the phase characteristics, Figure 3 ■ Figure 1 Block diagram V
2 is a diagram showing details 1 of the memory circuit 3 shown in FIG. , 41, 1 and 2 are an auxiliary transformer and a FRI auxiliary current transformer that introduce the respective heavy voltage V currents i into the Moh type distance relay. The voltage signal introduced into the relay passes through a memory circuit 3 and is converted into a voltage signal 3*, which is input to a square wave conversion circuit 4. - The power and current signals are applied to the vector synthesis circuit 6 after IIC is applied to the current signals that have been advanced by the phase shift circuit 5.
Smell-C converts the voltage signal KV from the auxiliary transformer 1 to J
A voltage signal of 2 V is applied to the IM foot turn all 7 minutes' voltage signal, and a 2 V voltage is applied to the combined signal I- to the square wave conversion circuit 8. The outputs of the square wave conversion circuits 4 and 8 are connected to the AND circuit 9 in the next stage.
is applied to the on-delay circuit 10 via. So AN
If the output of the D circuit 9 continues for more than the time of the on-delay circuit 10 (90° time to obtain the phase characteristic shown in FIG. 2), the relay outputs a trip output. This operating principle is known as a Moh distance relay.

In the Moh type distance relay mentioned above, in order to clearly distinguish whether the fault near the origin O of the phase characteristics in Figure 2 is in the forward or backward direction, the pre-fault voltage is attenuated at the same frequency as the pre-fault voltage by a full memory circuit. It is introduced into the square wave f conversion circuit 4 and used as a polarity of 3V. However, this memory circuit is a kind of filter, and for example, as shown in FIG.
It is composed of a second-order bandpass filter consisting of C1.

[Problems with back filtration technology]

The transfer function in the case of FIG. 3 is expressed as follows, where C1 is the angular velocity corresponding to the rated frequency of the system. ωl′f: By selecting as described above and setting α excessively, the input power ratio becomes /l! Even in the case of one extinction, a waveform that attenuates while maintaining the angular velocity of C1 can be obtained. In order to slow down this attenuation and prolong the memory effect, it is necessary to make the above-mentioned α small, that is, to set the so-called Q value (Q=-) of the filter to a high quality α. However, if the Q value is increased, the phase angle of the memory circuit will change greatly with a slight change in the input frequency. This means that the phase characteristics of the Mo-type distance joint ↑ IL which also corrects f3: changes greatly (for example, it changes from 11 to 12 in the 2nd v).
-QJ saturation of malfunctions and malfunctions increases. The frequency of the grid always fluctuates slightly, and the possibility of frequency fluctuations increases, especially when the operation of the relay is required, so the large fluctuations in the above-mentioned installation characteristics are It's not something that can be overlooked.

[Purpose of the invention]

The present invention has been made with the aim of solving the above-mentioned problems.
LJ's objective is to provide a distance relay whose characteristics do not change.

[Many inventions]

In the present invention, a memory function is added to the direction detecting element for detecting the fault direction, and both the distance measuring element having the range including the relay installation point and the memory effect direction detecting element are both in I/C operation. The purpose is to derive the relay output when the

[Embodiments of the invention]

Embodiments will be described below with reference to the drawings. FIG. 4 is a block diagram showing an embodiment of the Moh type distance relay of the present invention. In FIG. 4, the same symbols as in FIG. 1 indicate that the structure can be the same as in FIG. 1. FIG. 5 is a diagram showing the phase characteristics of the directional element 140 housed in the Mauh-type distance relay, and FIG. 6 is a diagram showing the phase characteristic of the offset motor element 15 housed in the Mauh-type distance relay.

In Figure 4 VC, 1 and 2 are auxiliary transformers and auxiliary current transformers that introduce the voltage V and current i of the system into the Moh type distance relay, and are similar to those in Figure 1. The auxiliary current transformer 2 has its output (current coefficient +<51) 1Ii8i of the busy transmission line.
A phase shift circuit 13 that shifts the phase by angle θ is connected. History 1111 auxiliary transformer l output and transfer 411 circuit 1
The outputs of 3 are both directional element 14 and A-set mode comparator 1.
5 VC is applied, and the outputs of both transistors are passed through the Am) circuit 32 and used as the output of the Moh type distance relay. Here, the configurations of the direction element 14 and offset motion element 15 described above will be explained.

(a) At the output of the directional element auxiliary transformer l, V is the memory circuit 3 Vc connection U1
, , and 6V are connected to the square wave conversion circuit 16 . Moreover, 71 is the output of the phase shift circuit 13, and the square wave conversion circuit 1
Connect to 7. Further, the output thereof is connected to an AND circuit 18, and is ANDed with the output of the square wave conversion circuit 16 to form an AND fz, and is outputted from the directional element 14 through an on-delay circuit 19, an off-delay circuit 20, and an on-delay circuit 21.

(b) The 4V output from the offset motor element auxiliary transformer 1 is connected to the front distance setting circuit 22 and the rear distance setting circuit 23, and the 8V output from the front distance setting circuit 22 is connected to the vector synthesis circuit 24. The 9V output from the rear distance setting circuit 23 is the vector synthesis circuit 2.
5 respectively. On the other hand, at the output of the phase shift circuit 13,
oI, K, , I are the vector synthesis circuits 24 and 25
Vc connection, and the output of the vector synthesis circuit 24 (K+oI
KgV) is sent to the square wave conversion circuit 26, and the output of the vector synthesis circuit 25 (K,,
7 respectively. Furthermore, these outputs are connected to AND circuit 2.
8 and performs an AND, and outputs the offset mode element 15 via an on-delay circuit 29, an off-delay circuit 30, and an on-delay circuit 31.

The operation of the configuration example configured as described above will be explained below. The following is an explanation of the operation: - the operating principle of the configuration example, the response when there is a fault voltage in the configuration example and the frequency fluctuates, the case where there is no fault voltage and the frequency of the previous voltage does not fluctuate, and the accident. ^Responses when the frequency of pre-failure voltage fluctuates without IJ voltage will be explained separately.

■ - If an accident occurs in the operating principle system of the configuration example, itl pressure in decimal time ■
i are respectively introduced into the Moh type distance relay. The introduced voltage Q is changed to a voltage value - 4 in the auxiliary transformer 1, and the current i is changed to 51 in the auxiliary current transformer 2, and is introduced into the phase shift circuit 13, where it is shifted. Outputs from the phase circuits are applied to directional element 14 and offset motion element 15, respectively. The actions of the direction element 14 and the offset motion element 15 will be described below.

(a) The output 4* from the directional element auxiliary transformer 1 is applied to the square wave conversion circuit 16 via the memory circuit 3 as a voltage signal of 6V. Further, the output from the phase shift circuit 13 is also applied to the square wave conversion circuit 17. The output of both these names is il″jAN
Through the D circuit 18, the on-delay circuit 19 at the next stage measures the time (time ψl to obtain the phase characteristics shown in FIG. 5).
get the output. This output is made continuous by an off-delay circuit 20 in the next stage, and is outputted from the direction element 14 via an on-delay circuit 31 for time coordination with an offset mode element 15, which will be described later.

The phase characteristics of the directional element 14 shown above are as shown in FIG. 5, and it is not difficult to see the front in the protection direction.

(b) The 4V output from the offset motor element auxiliary transformer 1 is applied to the MiJ direction distance setting circuit 22 and the rear distance setting circuit 21, and the front force elevation is set to 8 seconds for the voltage signal and is applied to the vector synthesis circuit 24. to be applied. In addition, on the rear side, a voltage signal of 9V is applied to the vector synthesis circuit 25r (applied to the vector synthesis circuit 25r).Furthermore, the output of the phase shift circuit 1; 3 is applied to the current signal as 1oi to the vector synthesis circuit 24,
The current is also applied to the vector synthesis circuit 25 as i. The vector synthesis circuit 24 generates a synthesized signal. I-ni 8
<7 to the square wave conversion circuit 26, and in the vector synthesis circuit 25, the combined signal Kll I + is applied to the square wave conversion circuit 27 as 9V.

The output of this image quality conversion circuit is passed through an AND circuit 28, and is then time-measured by the A delay circuit 29 at the next stage (position 1 in Fig. 6).
K to obtain one characteristic is 92 hours), and the output is a) J. This output is made continuous by the off-delay f0 path 3° of the next stage, and is made into the output of the off-motor/sink 15 via the on-delay circuit 31 for time coordination with the aforementioned direction element 14.

At this time, the phase characteristics of the offset elements U and Q elements 15 completely cover the protection range shown in FIG. In the above, the output of the 7J<shi/c direction element 14 and the output of the offset wave system 15 are AN
D'', l: The characteristics shown in FIG. 7, 30VC, are obtained.

■ If there is a fault voltage and the frequency is fluctuating, a fault occurs.
When the frequency fluctuates on the L pressure surface, the offset mode element 15, which does not have the entire memory circuit 3, is not affected by the phase shift of the memory circuit 3, and 1 cuyu on the phase is 1 year old as shown in FIG. be. Also, since the memory circuit 3 is present in the direction element, the phase characteristic tilts from the fifth direction 133 to the direction 34.
However, as shown in phase '111t+36 (AND of direction element 14 and offset motion element 15) in FIG. Very little impact or no impact on protective properties.

■ If there is no fault voltage and the pre-decimal frequency does not shift.

, J failure, the offset motor element 15 operates with only the current I, and the fault direction is determined by the memory-equipped direction element 14, so a reliable relay response can be expected.

■ When there is no decimal voltage and the pre-fault frequency is shifted The phase characteristics of the directional element 14 will be tilted as shown in Figure 5 due to the pre-fault voltage, but the impedance seen by the offset motor element 15 due to the pre-fault voltage will be within the operating range. Because outside,
There is no trip output. history ((an accident occurred,
'If the voltage V disappears, the offset motor element 15
responds only with the current (2), and since the directional element 14 reliably looks inward, a sharp relay response can be expected. As can be seen from the above explanation, the slope of the relay characteristics (circular characteristics) caused by the phase shift of the memory circuit, which was a conventional technique, can be prevented by using the present invention, and the A point accident shown in Fig. 7 can also be prevented. can be protected.

The characteristics of the combination of the direction element and the offset motion element have been described above. 1, the work of J11 has an effect 1rJ] It is not 1 that invites.

Furthermore, it is needless to say that the same effect as in the first embodiment of the present invention can be obtained by combining the memory circuit power-enhancing element in the sister example of the present invention with the two elements of the leaf characteristic that include a point in the relay installation. .

〔Effect of the invention〕

As explained above, according to the present invention, the slope of the phase characteristic due to the frequency fluctuation of the input voltage is removed, thereby providing the advantage that the system can be protected reliably.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the configuration of a conventional distance relay, Fig. 2 is a diagram showing the characteristics of the Moh-type distance relay shown in Fig. 1, and Fig. 3 is a diagram showing the characteristics of the Moh-type distance relay shown in Fig. Fig. 4 is a diagram showing a memory circuit for a maw distance mystery pregnancy test according to an embodiment of the present invention, Fig. 4 is a diagram showing a Moh type distance relay according to an embodiment of the present invention, and Fig. 5 is a diagram showing an embodiment of the present invention. FIG. 6 is a diagram showing the phase characteristics of the built-in offset motor element similar to FIG. 5.
FIG. 7 is a diagram showing the phase characteristics of the heptad-shaped distance red chest according to the embodiment of the present invention. J... Auxiliary transformer 2... Auxiliary current transformer 3...
Memory circuits 4, 8, ], 6, 1? , 26 , 27
...Square wave conversion circuit 5,13...
- Phase shift circuits 6, 24, 25... Vector synthesis circuit 7... Setting 1 (l) path 9, 18, 28, 32... AND circuit i0.1
i+, 21, 29.31... On-delay circuit (7317) agent Patent attorney Nori Chikakan Yu (and 1 others)
name) 1, Figure 1-Figure 2 1-L----10V Figure 4 (I)

Claims (1)

[Claims] 'A distance relay that introduces voltage and current from the gravity system, performs a phase comparison using the composite value of each electrical quantity, and produces an operating output when the phase and magnitude have a predetermined relationship. A memory 9'j example direction detection element for detecting the 1st section, and a distance measuring element for detecting all faults up to a preset distance and having a target pupil circumference that includes the relay installation point. , AiJ A distance relay characterized in that an operating output is derived by the logical product of each output.