SU1358029A1 - Device for detecting single faults of relay protection units - Google Patents

Abstract

The invention relates to electrical engineering and can be used in relay protection of electrical installations against damage and abnormal modes to monitor the health of relay protection devices. The aim of the invention is to improve reliability by isolating the faulty kit and the fault itself. In the event of a fault, three sets of impulse protection from the clock generator 15 are connected to one phase. The malfunction of block 1 appears at the inputs of all the corresponding blocks, therefore, the signals at the test points at the outputs of the blocks of the 2 relay set are different from the signals at the corresponding control points of the relay protection sets 3 and 4. At the outputs of the fault coding block 9, and therefore at the corresponding inputs decisive. block 13 single signals appear. 3 tab. 5 il. S SrzG to g

Description

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15

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11358029

The invention relates to electrical engineering and can be used in relay protection of electrical installations against damage and abnormal modes to monitor the health of relay protection devices.

The aim of the invention is to increase reliability by isolating the faulty kit and the malfunction itself.

Figure 1 shows the functional diagram of the device dd1I for detecting single faults of relay protection | figure 2 and 3 are examples of circuit sets of relay protection; on Fig.4 and 5 are examples of structures of the decision block.

A device for detecting single faults of relay protection sets contains a switch 1 through which the inputs of sets 2-4 of relay protection are connected to a protected network. The control points of the sets and sets are connected to the inputs of each pair of logical elements EXCLUSIVE OR 5 and 6, 7 and 8, which serve as inputs to the fault coding unit 9, as follows: the first control points of sets 2 and 3 are connected to the first inputs of the first pair of logical elements 5 and 6, and the second inputs of this pair are connected to the first control point of set 3, etc., and the nth control points of sets 2 and 3 are connected to the first inputs of the nth pair of elements 7 and 8, and the second inputs of this pair are connected with the nth set reference point 4. Outputs logical elements EXCLUSIVE OR serve as outputs of the fault coding unit 9, which are connected to the inputs of channels 10 and 11, serving as inputs to the decision unit 12, the outputs of the decryption channels are connected to the input-registers 13, the outputs of which are the output of the decision unit and connected to the inputs of the indicator 14. In addition, the output of the clock generator 15 is connected to the control inputs of the switch 1 and the decision unit 12.

The control points of the relay protection kit will be primarily the external outputs of the set (for FIG. 2 this is the output of element 16; for FIG. 3, the output of element 17) and unbranched outputs of the blocks (for FIG. 2, these are outputs of elements 18-21, for fig.Z - outputs of elements 22-28). Under nera30

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the branching output is understood to be such an element output, after which there is no branching in the circuit, i.e. this output is connected by only one of the inputs of any of the following elements. These control points will be necessary, since without any of them it is impossible to distinguish between faults of two elements connected in series (for example, for FIG. 2, having only a control point for element 28 and not having element 26 for control points, it is impossible to distinguish faults of elements 26 and 28). Thus, for FIG. 2, outputs of elements 18, 19, 20, 21 and 16 are mandatory, and for FIG. 3 these are outputs of elements 22-21, M; 18. These checkpoints are not enough to determine the type of fault. To these control points are added the outputs of the blocks, which are determined taking into account the fault condition of any element of the relay protection set at least at one of these points provided that there are blocks whose malfunction does not occur in any of the devices. pertinent control points.

The coding block 9 consists of 2 elements EXCLUSIVE OR.

The truth table of the logical element EXCLUSIVE OR is presented in Table 1.

In Table 1, X and X 2 are the inputs of the logical element EXCLUSIVE OR, and Y is its output.

Table 2 illustrates the operation of each support of logical elements EXCLUSIVE OR. The first three top lines of the table reflect all possible signal values at the k-th control point of the three sets of protection, and the bottom two lines - the signal values at the outputs of each pair of elements EXCLUSIVE OR.

In any set of relay protection, only one malfunction can occur. From Table 2 it can be seen that irrespective of the type of faults, logical 0 or logical 1, they are uniquely fixed at the outputs of the EXCLUSIVE OR elements. In the absence of faults (the first and last column of Table 2), the outputs of the EXCLUSIVE elements or there will be zero signals that go to the inputs of the decision block 12. The decision block consists of two channels 10 and 11 decryption, each of which is a combiner. The structure of the decryption channels depends on the structure of the relay protection kit and is designed so that, depending on the combination of zeros and ones on the codes of the fault coding unit, it is possible to determine the type and location of the fault. Under the type of fault we will understand the number. the defective item in the kit and under the seat is the number of the defective relay protection kit. Channel 10 decryption fixes the number of the faulty set, and channel 11 decryption fails inside the relay protection kit.

Consider the synthesis of the decryption channels for the relay protection set shown in FIG. To synthesize channel 10, we use signals that are recorded in the bottom two lines of Table 2. Since a fault can occur at any control point, for this, all even outputs of each pair of EXCLUSIVE OR blocks of the fault coding unit 9 (Fig. 1) are connected according to the OR 29 scheme (Fig. 3), and odd outputs according to the OR 30 scheme (Fig .5). At the exits

table 2

Signals as in the bottom two lines of Table 2. The decryption channel 10 (FIG. 1) has two inputs and three outputs. His work is presented in Table 3, Table B, Table 3 X, and X are the columns in which the values of the inputs are presented, and Y, Y, Y are the values of the decryption channel outputs.

Table 3

The functions of the outputs of the channel 10 dechif-40 radio (figure 1) have the form

Y, X

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45

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They are implemented on the logical elements He 31, 32 and And 33-35 (figure 5).

At the outputs of the elements And 35, 34 and 33, faults will appear in the form of a logical 1 of the first, second and third phase sets, respectively.

To synthesize decryption channel 11 (FIG), we use signals that appear at the outputs of pairs of logical elements EXCLUSIVE OR. Since faults will appear

If two outputs of these elements are used, then the outputs of each pair are connected according to the scheme ШШ. In FIG. 4, these are OR elements 36-40, and in FIG. 5, 41-49.

Each IZH logical element corresponds to a control point of a relay protection set and if the signals do not match in a set of control points of two sets of relay protection, then there will be single signals at the outputs of certain OR Logic Elements.

4 are indicated; elements OR 36-40, 50, 51, elements NOT 52-67, 74; elements And 58-66, register 13.

Figure 5 marked: elements OR 41-49, 29, 30, elements NOT SG, 32, elements AND 75-83, register 13.

Elements 50, 51, 56, 57, 64-66 (figure 4) and elements 29, 30, 31-35 (figure 5) are a decryption channel, a decision block that captures the number of the correct set. .

As can be seen from Figures 4 and 5, this decryption channel does not depend on the structure of the relay protection kit and differs in the number of inputs of the OR elements (respectively, elements 50, 51, 29 and 30). The number of ETSH1 inputs is equal to twice the number of control points. The remaining elements of the decision blocks (Figures 4 and 5), in addition to the register, represent the decryption channel, which fixes the faults inside the relay protection kit. This decryption channel. In all decision blocks consists of OR elements, the number of which is equal to the number of control points, AND elements, the number of which is equal to the number of blocks of the relay protection kit, and the elements .NON, the number of which depends on the structure of the relay protection kit. The inputs of the decision block are the inputs of the elements. OR, which are connected to the fault coding unit as follows: the odd outputs of the coding block. Are connected to the first inputs of the elements OR 36-40 in FIG. 4 (41-49, FIG. 5). and to the inputs of the element OR 16 in FIG. 3 (29, FIG. 5), and the even outputs of the fault coding block - to the second inputs of the elements OR 36–40 in FIG. 4 (41-49, FIG. 5) and to the inputs element OR 51 in figure 4 (30, figure 5) "Outputs of elements And 58-66 in figure 4

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(75-83 and 38-33 and the element OR 46 in FIG. 5) are connected to the information inputs of the register 13 in FIG. 3 and 4 (12, FIG. 5), and the control input of the register is connected to the output of the clock generator.

Consider the operation of a device for detecting single faults of a three-phase relay protection with a decision block in FIG. 5 in the absence of faults in the relay protection. The clock generator 15 (FIG. 1) for a period of time T, for example 1 hour, forms a single pulse of duration t, for example 1 second. This pulse arrives at the control input of the switch 1 (FIG. 1), which connects the inputs of three sets of relay protection to one phase. Working with one information signal at the input, the sets of relay protection in the absence of faults in them form the same signals at their test points, which arrive at the inputs of logic elements EXCLUSIVE OR 5-8 (FIG. 1). At the outputs of the elements EXTENDED OR there will be zero signals. These signals arrive at the inputs of the decision block (figure 5) and at the outputs of the elements OR 41-49 and 29, 30 there will also be zero signals and none of the And 75-83 and 33-35 elements will work. Zero signals in the vehicle also at the outputs of the register 13 at fit 5 (12, in Fig. 1) and on the indicator 14 (Fig. 1) zero bits will be lit, which indicates the absence of a malfunction in the sets of relay protection.

Let the block, indicated in FIG. 3 by the numeral 84 in the relay set, indicated in FIG. 1 by the numeral 2, be defective. Three sets of single impulse protection from the clock generator 15 (FIG. 1) are connected to the same phase with the switch 1. The failure of block 1 appears at the inputs of all blocks except the 26th and 28th, the successor1: but the signals at the control points at the outputs 22-27, 17 (Fig. 3) of the relay set 2 blocks (Fig.) from. signals at the corresponding test points of sets 3 and 4 of the relay protection (FIG. 1), And so on 1, 3, 5, 7, 9, Yun 15 outputs of the fault coding unit 9 (FIG. 1), and therefore with

713

The response inputs of the decision block 13 (Fig. 1) appear to be single signals, and all other outputs of the fault coding block and the inputs of the decision block will have zero signals. Single signals will also appear at the outputs of the OR elements 41-45, 47, 48 and 30 (Fig. 5), and at the outputs of the OR elements 46, 49 and 29 (Fig. 5) there will be zero signals. From the outputs of the OR elements 41 and 42 (Fig. 5), single signals are fed to the inputs of the AND 25 element (Fig. 5) and a single signal appears at its output, which indicates a failure of the first block of the relay protection kit (Fig. 3). At the outputs of the elements And 76-83 (figure 5) will be zero signals / In addition, a single signal from the output of the element OR 30 (figure 5). Enters the first input of the element And 35 (figure 5), the second input of which is also A single signal comes from the output of the element OR 29 (FIG. 5) through the element NOT 3V (FIG. 5) and the output of the element 35 (FIG. 5) will be a single signal, which indicates that the fault has occurred in the set of 2 relay protection (Fig. 1) At the outputs of the elements And 33 and 34. (Fig. 5) there will be zero signals, The signals from the outputs of the elements And 7j-83 and 31-33 (Fig. 5) are fixed by a single ignalom .taktovogo from generator 13 at the register outputs (5) (12, Figure 1) and on the display 14 (FIG. 5) is illuminated DTC. The device is triggered.

The decision block (figure 4) works in a similar way. In this case, the values at the outputs of the elements And 58, 77 and 63 fix respectively the operability of the elements 85, 18, 29, 20, 21, 16 (Fig. 2), and the values of the signals at the outputs of the elements 64-66 - sets of protection 2-4 (FIG. .one).

Thus, the invention permits detection of a faulty phase set and a faulty element in it. With a slight schematic complication

The scientific research institute of the circuit allows to significantly reduce the time of troubleshooting. For circuits of average complexity, it decreases by a factor of 3-4.

Claims (1)

Invention Formula 0 five 0 0 0 five A device for detecting single faults of relay protection kits containing a fault-coding unit, the inputs of which are connected to the corresponding outputs of the relay protection kits, an indicator characterized in that, in order to increase reliability by ensuring that the faulty kit is highlighted and the fault itself, a decisive unit is added to it consisting of two decryption channels, the outputs of which are connected to the corresponding inputs of the register, while the coding block faults is composed of 5p of the IS-KEY or IP logic elements, where n is the number of control points of the relay protection set, the first inputs of each pair of logic elements EXCLUSIVE OR are connected to the corresponding control points of any two sets of relay zashdty, the second inputs are connected to the corresponding control points, the third point, the outputs of the logic elements EXCLUSIVE 5 ALS OR, which are the outputs of the coding block of malfunctions, are connected to the corresponding inputs of the decryption channels, which are the decision block moves, the register outputs are the outputs of the decision block and are connected to the corresponding indicator inputs, the relay protection kit inputs through the newly introduced switch are connected to the corresponding phases of the protected object, and the output of the newly entered clock generator is connected to the control inputs of the switch and register, while the control input of the register is the control input of the decision block. 0 pr-rr 21 -J  - „j, - -   at. ng  g - " Lj-4 iCfeU h V: 50 & n 51 G. / rnOff / TJOSOMi / gene / turu yes / g one Editor G. Volkova Compiled by KL Silan Tehred A. Kravchuk Proofreader A. Obruchar Order 6003/53 Circulation 618. Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, ul, Proektna, 4 IIS.5