JPS6046718A - Protective relaying device - 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 provides a protective relay device, particularly a protective relay device that provides complete protection of a power system by mutually transmitting the amount of power of the system via a transmission means at both ends of a power transmission line. This invention relates to a protective relay device.

[Technical background of the invention]

FIG. 1 shows an example of the configuration of a conventional FC protective relay device using a digital transmission method. In Fig. 1, 1 is a protective relay device, for example, a current differential relay system is used to transmit 1i9
It is installed in the inner cell +6 of the power transmission line to protect line 2. The protective relay device 1 for each terminal is composed of a converter 3, an arithmetic device 4, and a transmitting/receiving device 5. The converting device 3 receives a large input of the system electrical quantity Ii of the power transmission line 2, samples this input at appropriate intervals, converts it into a digital value, and outputs it to the transmitting/receiving device 5. The transmitting/receiving device 5 and the transmitting device i'ff6 constitute a digital transmission system k14,
Transmitting/receiving device i4f: 5 transmits the sampling data of the system electricity amount outputted from the converting device 3 to the other end via the transmission device 6, and at the same time converts the system at the other end to which the data is transmitted from the other end. Transmission signal regarding electrical quantity? It is received and output to the arithmetic device 4. In addition, the calculation device 4 performs enhancement calculations such as current differential protection based on the system electricity amount at its own end inputted from the conversion device 3 and the system electricity amount at the other end inputted via the transmitting/receiving device 5. 2, pS detection is performed.

[Problems with background technology]

One of the problems with the protective relay device that performs protective operations using digital transmission as described above is the transmission speed of the digital transmission system. That is, each protective relay device in FIG. 1 samples at its own end and digitally [
It is necessary to transmit the directly converted system electrical quantity to the other end before the next sampling is performed. Therefore, the transmission device 6 needs to have a transmission speed sufficient to carry out the above transmission. - I, , I as the system electrical quantity sampled at one terminal of each relay as a column. , three phases of air, and four views of zero-phase current, and considering the case where each is transmitted as a 12-bit digital quantity, the number of bits of digital data required to transmit one sampling data is The total number of bits is 77 bits, including the generally required 13-bit synchronization frame signal and 16-bit CRC check signal. If sampling is performed at 30° intervals in a 60Hz power system, the above digital signal must be transmitted 720 times per second, and the transmission device 6 has a frequency of 77 x 720 = 55.4 Kbps (b 'au per
It is necessary to have a transmission rate of 5 seconds or less. This one shift is 48K, which is the transmission speed of standard transmission equipment.
bps is also large, making it difficult to transmit using the above-mentioned standard transmission equipment). Therefore, in such a case, a transmission device with a standard transmission speed of 1544 Kbps (PCM first order group), which is one rank higher than the conventional 48 Kbps transmission device, or a transmission device with a specially non-standard transmission speed is used. However, because these devices use transmission devices with excessive transmission speeds, the transmission efficiency decreases, and because they are non-standard transmission devices, they are prone to adultery. Is there a problem with that?

[Purpose of the invention]

The present invention has been made with the aim of solving all of the above problems, and provides a complete U relay device that can efficiently transmit data using a transmission device having a standard transmission speed. It is an object.

[Summary of the invention]

In the present invention, each end of the protected section is connected by a plurality of transmission devices, and the sampled grid electricity amount at the own end is transmitted to the other end with shifted degeneration timing, and the A protection calculation is performed using the transmission data obtained by combining and rearranging the transmission data and the converted system '11L' at its own end (the above).

[Practice of the invention]

The entire embodiment will be explained below with reference to the drawings. Prior to detailed description of the present invention, the basic idea of the present invention will be explained with reference to FIG. 432 and FIG.

FIG. 2 is a functional block diagram showing the configuration of the first invention. The idea is to convert the amount of grid electricity inputted from current transformer a into a digital value by sampling it through converter b'2, and then set the transmission timing of each sampling data in all transmitting/receiving devices I-i-c. The data is shifted and transmitted to the other party V:iI'+ through all the plurality of transmission means d.

On the other hand, the sampling data from the other party 9j1°4 is transmitted/received, IM: 14) ilj, c'/z valve is sent to the arithmetic unit e, and the timing kAUe is returned to the original system'tmu air volume. Do all 39-before protection. Here, if there is an abnormality in the data sent from the other end by the sending/receiving official &ic, the output from the abnormality detection means f is sent to the entire calculation unit e.
to change the protection operation. That is, it is an attempt to cover the transmission speed by shifting the serial data and transmitting it alternately.

FIG. 3 is a functional block 1 showing the 4.1ζ configuration of the second invention.
Nu1. This idea is based on the system f that is input from the current transformer a.
3i γ Insanity lid is converted to digital data by sampling all the valves of the conversion device, and transmitting and receiving it.
The device c transmits the data as separate sampling data divided at equal intervals via a plurality of transmission means d.

On the other hand, the sampling data from the other end is a VC manufactured by the sending and receiving official.
are introduced into the arithmetic unit e via the arithmetic unit e for combinatorial calculation, and the operation W is changed depending on the type of the abnormality detection means f.

In this case, if one of the sun shilling data is abnormal, the calculation is performed using only the healthy data of the other. Similar to the first idea discussed above, this is an attempt to cover the entire transmission speed by dividing the sampling RLK and transmitting it separately.

FIG. 4 is a block diagram of an embodiment of the protection network IE device according to the present invention. In Fig. 4, the same components as those in Fig. 1 are the same components. Note that this implementation sequence is also based on the basic idea shown in FIG. In FIG. 4, the transmitting/receiving devices 5 and 7 respectively input the sampling data of the system electrical quantity output from the converter 3, and output transmission signals to the respective transmission devices 6 and 8, and at the same time transmit signals from the other end. It receives the incoming transmission signal and outputs the system electrical quantity, which has been sanctioned at the output terminal, to the arithmetic unit 4. Further, each transmitting/receiving device 5.7 is connected to abnormality detection devices 9 and 10 that detect abnormalities in the transmission system.

Here, the abnormality detection devices 9 and 10 each monitor the digital transmission system, and output an abnormality detection signal Al+Az't: to the arithmetic unit 4 when an abnormality is detected.

FIG. 5 is a diagram for explaining how to transmit the sending data. In FIG. 5, the horizontal axis indicates time, and tl''-t12 shown next to T indicates the sampling time at which the system electrical quantity is sampled in the conversion device 3.A and B indicate the sampling time of each transmission device. 6.8? Indicates the transmission signal transmitted through the symbol S 1 =
Sll indicates sampling data to be transmitted.

Next, the operation will be explained. First, a case will be described in which the transmitting/receiving device 5.7 and the transmitting devices 6, 8 are operating normally. In this case, the conversion device 3 samples the system energy storage of the power transmission line 2 at sampling times tl''t12 at regular intervals, converts this into a digital amount, and outputs it to each transmitting/receiving device 5 and 7. Transmitting/receiving devices 5 and 7
is the data at each sampling time output from the conversion device 3, respectively, at the transmission timing? The data is transmitted alternately in a staggered manner.

That is, as shown in FIG. 5, the transmitting/receiving device 5 transmits the sampling data Sl during the period of sampling time tl''t3, and transmits the sampling data S3 during the period of sampling times t3 to t5. Similarly, the transmitter/receiver 7 transmits the odd-numbered sampled grid electricity Bfk at each sampling time, and the even-numbered grid electricity ffr, 'c at each sampling time.
Transmit.

In this case, as is clear from FIG. 5, transmission of the system electrical quantity in one sampling may be performed within a time corresponding to two samplings. Therefore, the transmission speed required for the transmission devices 6 and 8 when transmitting the amount of grid electricity is as follows:
An example of the transmission speed of the conventional IN mentioned above is 54.4K.
In terms of bps, it is 1/2 2 7.2 Kb
ps or more. However, the transmission speed of standard transmission equipment is 4
8 Kbps, standard transmission equipment is fully usable for transmission equipment 6.8. and transmission device 6.
The transmission signal transmitted via the transmitter/receiver FI5.7
After being received at , it is output to the arithmetic unit 4, and the respective output information is combined and rearranged in the order of sampling time. After obtaining regular sampling data through this rearrangement, the arithmetic unit 4 performs calculation q- regarding normal protective relay operation based on the respective data.

FIG. 6 shows another embodiment of how to transmit sampling data.

In the present embodiment 11, sampling data to be transmitted is divided and transmitted using a plurality of transmission devices. Note that this embodiment is based on the basic idea shown in FIG.

In FIG. 6, ■ is the amount of grid electricity input to the converter 3, tl, t2, . Indicates the sampling data to be transmitted. 6th
As is clear from the figure, the sampling data A and B transmitted by the transmission devices i:j 6 and 8 are data sampled separately at equal intervals with respect to the system 141. Therefore, even if only one of A and B exists, the arithmetic unit 1f4 can perform N operations related to protection.

In addition, when calculating the amount of grid electricity from sampling data, if you use all of the amplitude calculation formulas (1) or (2) shown below, you can correct the amount of electricity by just correcting the coefficients, regardless of the sampling period of the source data. The field of view value can be obtained.

l2=(A915-1-21m1m-1cosωT)
/ 5in2ωT ・(1) kl -1-Kt, n-4
10+m-2...(2) However, T: Sampling period As shown in Figure 6, when Aji is based on the sampling data of only B, the calculation speed and time required for determination are as follows. Although this is inferior to the case where it is based on the sampling data Ii, in many cases, protection calculations can be performed within a range that does not cause any practical problems.

Next, the operation when an abnormality occurs in the transmission of sampling data will be explained. In FIG. 4, the abnormality detection device ifi
: 9, 10 detects a drop in the level of the transmission signal, ? Data transmission is monitored using methods such as Liddy detection, cyclic code (CRC) verification, and double matching, and if an abnormality is detected in the transmitted signal, abnormality detection 1. The i-th AI chip or A2 is output to the arithmetic unit 4.

When the arithmetic unit 4 detects an abnormality in the transmission system through the abnormality detection No. 41 AI+A2, it changes to an arithmetic method that uses only the data of the transmission system whose internal calculations are completely healthy.

13. Since the sampling data transmitted from each transmission system is sampled at equal intervals as described above, protection calculation is possible even if only one of the transmission data is used.

Therefore, the arithmetic device 4 switches the data used for internal computation to the normal transmission system side, and at the same time changes the computation method and the number of threads during the computation to a form corresponding to the data of 172 during normal operation.

FIG. 7 is a flowchart of arithmetic processing. Step 5
1, the presence or absence of the abnormality detection signal A1+A2 output from the abnormality detection device 9.10 is determined. If neither the abnormality detection signal Al nor A2 is output here, the transmission system is all normal, so the process moves to step 52, and all the sampling data shown in rA6 diagram can be used as the data to be used as the basis of calculation. , Therefore, in step 53, the "C regular defense calculation is performed. Also, when it is determined in step 51 that the abnormality detection signal (At l A2) exists, the process moves to step 54, and the υζ classification of the abnormality detection signal Δ is performed. is determined, and each process of steps 55 to 57 is performed.

That is, when an abnormality occurs in the first transmission device 6 and the abnormality detection signal A is output from the abnormality detection device 9, the process moves to step 56, and the even V,th signal transmitted via the second transmission device 8 is outputted from the abnormality detection device 9. Input all sampling data (B) only. Here, even-numbered data (B) is regular sampling data (I
), and therefore, when performing a protection operation, it is necessary to process the sampling period as if it were doubled. Therefore, in the Stella 7' 58, a protective calculation is performed using the calculation formula corresponding to the above-mentioned condition, and the coefficients for the calculation γ.

Next, an abnormality occurs in the second transmission device 8 and the abnormality detection device 10
An abnormality detection signal A2 was output from The case is the opposite of the first situation, and in step 55, JJ'', M I
: Only the sampling data (A) of I is used, and the following operation is performed in the same manner as in the case of the first sending device. Also step 5
If the abnormality detection signals A1 and A2 are output in step 57, the calculation is disabled.

As is clear from the above explanation, even if an abnormality occurs in one of the transmission systems, the arithmetic unit 4 can perform protection calculations to some extent.
(If it is possible to continue, there is a possibility of an abnormality in the operation of the protection relay device due to two or more abnormalities in the transmission system.)
It decreases to 9.

Upper bC'J'! In the example, the explanation was given assuming that 2+J1 transmission systems are used for transmitting sampling data, but the number of transmission systems is not limited, and if you want to transmit all of a large amount of sampling data, 3 If
It is possible to use transmission fundamentals from dl to h.

Note that when three or more sets of transmission systems are used, various methods can be considered for calculation processing when an abnormality occurs in one of them. - For example, data to be transmitted by a transmission system in which an abnormality has occurred may be interpolated with data transmitted from another healthy transmission system, or a part of the transmitted data from a healthy transmission system may be truncated to create a form that is easier to calculate. Processing such as thinning out the data can be considered. Also, the sampling interval is 30
If the number of transmission systems is three, the sampling interval for each transmission data is 900, and amplitude calculation can be performed using data from only one transmission system.

Furthermore, in the above embodiment, it has been explained that the divided data is transmitted via the transmission devices on each side depending on the sampling time, but the invention is not limited to this. It is also possible to use multi-line transmission equipment. In this case, although the abnormality is limited to the modulation/demodulation section in the superimposed transmission device, the transmitter/receiver section in the protective relay, and the connection between the two, it is expected that reliability will be improved compared to the conventional system.

Furthermore, in the above implementation report, JF!
In this case, multiple transmission systems are created between multiple terminals, and each of the processing steps in the flowchart described above is performed.
Of course, this is done using Yako's arithmetic device.

〔Effect of the invention〕

As explained above, according to the present invention, j, Ij
The number of transmission systems is created, and the system i sampled at each end
! Since the ttj 'di air volume is divided into sampling times that are shifted from each other and transmitted, and when an abnormality occurs in the transmission device, calculation processing is performed using the transmitted data on the healthy side according to the 11π class of the abnormality. It is possible to provide a highly reliable protective relay with continuous protection operation.

[Brief explanation of drawings]

Fig. 1 shows the configuration of a conventional glue transfer device using a digital transmission system, Fig. 2 is a functional block diagram for fully explaining one of the basic ideas of the present invention, and Fig. 3 is a functional block diagram to explain another aspect of the basic idea of the present invention, Fig. 4 is a configuration diagram of an implementation of a protective relay device according to the invention, and Fig. 5 is a transmission of sampling data. FIG. 6 is a diagram showing 41 embodiments of how to transmit sampling data, and FIG. 'C line 3...
Conversion device 4...operation q-device iff. 5.7...Transmission/reception device 6,8...Transmission device 9.1
0... Abnormality Detection Device Patent Applicant Tokyo Shibaura Electric Co., Ltd. Representative Patent Attorney Norio Ishii Figure 2 Figure 3 Figure 5 Figure 7

Claims (2)

[Claims] (1) In a protective relay device that performs system protection by sampling the grid electricity amount at each end of the power system and mutually transmitting conversion data regarding the grid electricity amount via a transmission means, the protective relay device ffi a plurality of transmission means that connect each end of the protected section; a plurality of transmitting/receiving devices that transmit data to the other end while shifting the transmission timing of the grid electricity amount at the own end and receive transmission data from the other end; An abnormality detection means that detects individual abnormalities in the transmission means and outputs an abnormality detection signal corresponding to the transmission means, and a protection calculation is performed by inputting the converted system electrical quantity at its own end and the transmission data from the other end, respectively. 1. A protective relay device comprising: an arithmetic device for performing a protection operation, the arithmetic device having a function of performing a protection arithmetic operation by combining transmission data whose transmission timings are shifted. (2) In a protective relay device that performs system protection by sampling the amount of grid electricity at each end of the power system and mutually transmitting converted data regarding the amount of grid electricity via a transmission means, the protective relay device A plurality of transmission means connecting each end of the protected section and grid electricity ff1 at the own end
a plurality of transmitting/receiving devices that alternately thin out and divide data according to f sampling times, transmit the divided transmission data to the other end, and receive the transmitted data from the other end, and detect individual abnormalities in the transmission means; It is equipped with an abnormality detection means that outputs all the abnormality detection signals corresponding to the transmission means, and an arithmetic device that performs a protection calculation by inputting the converted system electricity amount at its own end and the transmission data from the opposite end, respectively. A protective relay device characterized in that the device has a function of performing a protection calculation by combining each divided transmission data, and a function of performing a protection calculation using only one of the divided transmission data.