JPH01157215A - Setting system for digital type protective relay - Google Patents

Abstract

PURPOSE:To prevent a setting value from being set in error and prevent a relay from being incorrectly worked, by generating alarm, when it is discriminated that a value computed with the combination of a plurality of set setting values is improper on processing. CONSTITUTION:Each current on the primary side and secondary side of a protected transformer T1 is respectively transformed by main current transformers CT1, CT2, and the input to an input converter 10 is provided. The input of the output of the input converter 10, to a relay 11 is provided. The relay 11 consists of a setting section 2 for setting reference current on the primary side and secondary side of the protected transformer T1 and the ratio of the current transformation of the main current transformers CT1, CT2, and a relay discriminating section 12. The setting section 2 has a display means for generating alarm when it is discriminated that a value computed with the combination of a plurality of set setting values is improper on processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a digital protective relay device, and particularly to a digital protective relay device fK with an improved setting method for a relay element.

(Prior art) Figure 5 shows an already proposed digital protective relay device (
It is a block diagram of Japanese Patent No. 59-81981).

In FIG. 5, 1 is a microcombination unit 1 and a digital arithmetic processing unit (hereinafter referred to as MPU) 2 is a setting unit.

The MPU 1 inputs the amount of electricity of the protected system, and also inputs the setting value set by the setting unit 2, compares the magnitude, determines whether there is a failure in the protected system, and when it is determined that there is a failure. Output tri-lag output. 3 is a numerical setting circuit for setting a set value; 4 is a selection circuit for selecting a relay element to set a set value from among a plurality of relay elements; 5 is a memory circuit for storing the set value; however, the memory circuit 5 is an MPU l It may be inside. 6 is a switch that outputs a write signal for writing the setting value set in the numerical setting circuit 3 into the memory circuit 5; 7 is a control circuit; and 8 is a display for displaying the setting value of the relay element selected by the selection circuit 4. Display circuit, 9 is numerical value setting circuit 3
, selection circuit 4, memory circuit 5, control circuit 7 and display circuit 8
This is the path for transferring data.

Here, the numerical value setting circuit 3 is, for example, a multi-digit digital switch or a keyboard selection circuit 4 for inputting numerical values.
For example, the control circuit 7 has a key for inputting a load number for a rotary switch or a relay element.
For example, the microconbeater and display circuit 8 are, for example, 7
Segment (7 digits) or dot matrix display L
It is constructed using an ED (light emitting diode) indicator.

In the above configuration, when the # control circuit 7 is configured by a micro combinator, its operation is performed according to the flowchart shown in FIG. First, in Stella f6-1, the selected relay element is read out from the selection circuit 4. stella f
In step 6-2, a process is performed to read out the setting value for the relay element read out in step 6-1 from the storage circuit 5.

Then, in step 6-3, the result of Stella f6-2 is output to the display circuit 8 for display processing.

Step 6-4 is a process for determining whether the switch 6 is turned on. If it is not turned on, the process returns to step 6-1.

When it is turned on, the process moves to step 6-5, and in step 6-5, the setting value is read out from the numerical value setting circuit 3, and in Stella 7''6-6, the setting value is written to the memory circuit 5. Process.

Note that in this write process, 1. The area in which the setting value is written in the memory circuit 5IC is determined in advance for each relay element, and the area is determined according to the nine relay elements selected in step 6-1.

After completing the process in step 6-6, the process returns to Stella f6-1.

The processing described above with reference to FIG. 6 is executed by the control circuit 7.

The steps of the settling operation in the configuration shown in FIG. 5 will be explained below.

The operation of reading the set value is performed by selecting a relay element by the selection circuit 4 and displaying the set value for the selected relay element on the display circuit 8. The operation of writing the setting value is performed by selecting the relay element by the selection circuit 4,
(by numerical value setting circuit 3)! Set the I constant value. Then, by turning on the switch 6, the set setting value is written into the memory circuit 5 and simultaneously displayed on the display circuit 8.

(Problems to be Solved by the Invention) In the configuration described above, the setting value can be easily set by operating the numerical value setting circuit 3 in the setting section 2 and the storage switch 6. However, when setting the setting value of a relay element consisting of multiple setting elements, even if each setting element has a value within a predetermined setting range, the value calculated by a combination of multiple setting values If relay determination is performed using , the processing capacity of MPU 1 will be exceeded. That is, there is a risk that the number of words that can be calculated by the MPU 1 may be exceeded, and the MPU 1 may regard this as an extremely small value, leading to a malfunction. In addition, even in cases other than the above, there is a risk of erroneous settings and malfunctions due to forgetting to take precautions into consideration when setting the set value.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an r-inotaru type protective relay device that is equipped with a setting method that prevents incorrect settings of setting values and prevents malfunction of relays. It is an object.

[Structure of the invention]

(Means for Solving the Problems) In the present invention, if the value calculated by the combination of multiple set values set by the setting means is determined to be inconvenient in arithmetic processing, the display means issues an alarm. Composition nine.

(Function) Therefore, if the nine value set by the setting means is inconvenient, the display means will issue a warning, allowing the setter to recognize that this setting is inconvenient.

(Example) An example of the present invention will be described using a digital differential relay as an example. FIG. 1 shows an r-isotal type differential relay (hereinafter referred to as 87 relay). In Fig. 1, T1 is the protected transformer, CT1 and CT2 are the primary side of T1, the primary side main current transformer that takes in the amount of electricity on the secondary side, and the secondary side main current transformer. IO is an input converter that converts the signal level to a signal level for use in a subsequent relay.

The currents In and 112 on the primary and secondary sides of T1 are CT1
and CT2, the currents are transformed into currents I, , and 12, respectively, and input to the input converter 1.

Output from input converter 1 is 9! 1' and I2' are the reference current wires 11°112 on the primary and secondary sides of T1.
It also includes a setting section 2 for setting the current transformation ratio N1pNZ of CT1 and CT2, and a relay determination section 12. The setting section 2 has the same configuration as that shown in FIG. 5 described in the related art section.

The relay determination section 12 is composed of a micro combinator, a Grodarum memory, and the like. Here, the symbol for the quantity of electricity is defined as follows.

M...1 reference capacitance in the protected transformer 11...T1's primary lI quasi current If2...T1's secondary side reference current V11...T1's 1 missing rated voltage V12... ...T1's two missing rated voltage N1...c'rt's current transformation ratio N2--CT2's current transformation ratio 11...CTj's primary current work 2...CT2O secondary current It/v I2' ...Input transformer secondary current 1.
... Current transformation ratio matching coefficient based on the secondary side of T1 The current transformation ratio of the primary and secondary main current transformers does not match the transformation ratio of the transformer, so it is Flow ratio matching. For example, set the reference current to a value converted to the secondary side of the main current transformer,
A technique for matching the current transformation ratio from a set value through software processing is disclosed in Japanese Patent Laid-Open No. 186916/1983.

With the configuration described above, the secondary currents 11' and I2' of the input converter 10 are inputted to the 87 relay 111C, and the current transformation ratio matching coefficient is multiplied by 1 by software processing in the relay determination section 12. becomes. Relay judgment is performed using these KI11' and KI12'. The micro zero processor of the relay judgment section 12 reads the setting value (In v 112 t N1 * N2) from the setting section 2, and calculates 1 as the current transformer matching coefficient. Relay determination processing is performed according to the relay determination principle equation shown in the following equation.

IKI II +x21-Ka (1K1x11+1I2
1)≧Kb...(1) Furthermore, the above formula (1) is 87
This is the basic formula of a relay and is well known, so its explanation will be omitted here.

First, in step 2-1, the selected relay element is read out from the selection circuit 4 shown in FIG. In step 2-2, a process is performed to read out the setting value for the relay element read out in step 2-1.

Then, in Stella f2-3, the result of Stella f2-2 is output to the display circuit 8 for display processing. Step 2-4 is a process of fully determining whether or not the switch 6 is turned on. If it is not turned on, the process returns to Stella f2-1. Also, when it is turned on, move the process to step 2-5, and step 2
-5, a process of reading out a set value from the numerical value setting circuit 3 is performed.

In step 2-6, it is determined whether the next set value read out in step 2-5 is something that should be noted in relay operation.

That is, the setting value (IN m
The current transformation ratio matching coefficient calculated from 112pN1 IN2) is the integrated value of 1 and the secondary current of CT, KI1. It is determined whether or not is a value (number of work P) that can be processed by the micro processor of the relay determination unit 12.

If the value is processable, the process is moved to Stella f2-7; otherwise, the process is moved to step 2-8.

Stellar f2-7 performs a process of writing a set value into the memory circuit 5. In this write process, the area in which the set value is written into the storage circuit 5 is determined in advance for each relay element, and the area is determined according to the relay element selected by Stella f2-1. After the processing of Stella f2-7 is completed, the process returns to step 2-1 @ Stella f2-8 flickers the setting value to inform the person who set the setting value that processing is impossible.

After step 2-8, the process moves to step 2-1.

Next, a principle equation for calculating the current ratio matching coefficient of 1 from the set value will be explained.

The reference current 111 e 112 can be determined by the following equation based on the rated capacity M and the rated voltage Vtt a Vl2 of the protected transformer T1.

h 1 = M/V11... (2) h 2 = M/V12... (3) (2
), the reference current 111 e 112 obtained from the equation (3)
The current transformation ratios N1 and N2 of the main current transformers CT1 p and CT2 are set at the same time.

Also, 111 + 112 e N1 and N2 to CTl
e The secondary current 11, I2 of CT2 is x1 = 111/N1- (4) I2 = 112/N2 (5), and from equations (4) and (5), e 11 e Since I2 is converted into 1'*I2' at the same rate by input converter 1, 12N1 i2' = x i1' X□ ・@(7)L
It becomes N2. Therefore, 1 for the current ratio matching coefficient is calculated from the set value (111e 112 t N1 e N2 ) to (8
) can be calculated using the formula.

Here, the micro fa processor of the relay determination unit 12 is 16
If it consists of pit data, 1 word (= 1
The value that can be expressed with 6 bits is 215 (=32768)t.

When performing relay arithmetic processing, one-word arithmetic may be preferable from the viewpoint of reducing the arithmetic processing load and limiting the relay operation time.

However, as shown in equation (1), 1 is C for the current ratio matching coefficient.
It is calculated by multiplying by the secondary current 11 of T1.

In the relay determination section 12, the analog quantity output from the input converter 10 is converted into a digital quantity and relay determination processing is performed.

The CTlO secondary current 11 is subjected to the above-mentioned analog/digital conversion, and a digital filter and amplitude value are calculated from the digital amount.

Here, CTlO secondary current! Considering 1 as the full scale (=2) of the analog/digital conversion mentioned above, rounding to fit 1 unit into 1 word requires 1 in the current transformation ratio matching coefficient.
must be 16 (= 215/211) or less. Also, considering the weight of the digital filter and amplitude value calculation when calculating the secondary current 11 of c'r1,
Furthermore, the value of 1 for the current ratio matching coefficient becomes smaller by the weight.

However, as shown in equation (8), the current ratio matching coefficient is set to 1 and becomes a nine-value (h1 # 112 sNt #N2)
However, depending on the combination of set values, the current ratio matching coefficient may not be equal to or less than the above value. For example, the setting element M e Vl 1 p Vl 2
s N1 p When N2 is in the following setting range, M: 100 to 500 MVA Vll: 50 to 250 kV V12: 50 to 250 kV Nl: 600 to 600 O N2: 600 to 6000 M = 500&ffA, Vlt = 50 kV, Vl
2 = 50kV.

If N1=6000 and N2-600 are selected, (2
), From formula (3), 11t=2kA 11z=10
kA and from equation (8), 1 = 10 and ΔΔ6000
= 50, which is greater than the above value.

2kAX600 For this reason, xIIf must not exceed 1 word, and the microcombi crystal ignores the part exceeding 1 word and calculates with the remainder of 1 word, that is, the remainder after dividing by 2. .

Therefore, the relay will malfunction.

Even when such setting is performed, according to the present invention,
By determining whether there is an inconvenience in arithmetic processing, it is determined that there is an inconvenience and the set value is flickered. This prevents erroneous setting of the set value and prevents malfunction of the relay.

The presence or absence of a problem is determined at step f2-6 in Fig. 2. For example, if the current transformation ratio matching coefficient calculated from the set setting value is 1 and the full scale of the secondary current X1 of CTf (
This can be done by monitoring the overflow flag in the micro combinator to determine whether the integrated value of 1! Ru.

As explained above, it is determined whether or not the set value has a problem in relay operation, and if not, the set value is flickered to urge the person who set the set value to be careful (reset). This makes it possible to prevent erroneous setting of the set value, and as a result, prevent malfunction of the relay.

FIG. 3 describes another embodiment using a digital overcurrent relay (hereinafter referred to as OC relay) as an example.

In the case of a digital OC relay, the eave width errors of the operating values may not always be the same over the entire predetermined setting range. For example, a digital QC relay with a setting range of 0.1A to 1.0 people ■0.1A to 0.4A
is within ±10% ■0.5 A ~1. In some cases, it is within OAn±5'9L. The contents of ■■ above are clearly specified in the instruction manual (hereinafter referred to as the instruction manual), but if the person setting the setting value sets the setting value without checking the instruction manual, Even though the value was set within the range of , there was a risk of misunderstanding that the error was within ±5 seconds and forgetting to consider the margin for the error. This embodiment was developed to solve this problem.

In A in FIG. 3, steps 3-5 and 3-7 from Stella f3-1 are the same as steps 2-1 to 2-5 and Stella f2-7 in FIG.
Explanation will be omitted.

Stella f3-6 is set and determines whether the nine value is in the range of ■ or the range of ■, and if it is within the range of ■, step 3
-7, and after processing step 3-7, Stella f
Return the process to 3-1. Furthermore, if it is within the range of ■, the process is transferred to Stella f3-8, and Stella 7'3-8 flickers the set value to notify the setter that the error is within ±10 inches. In step 3-9, the setter determines whether or not the flickering set value is acceptable. If the branching process is acceptable, the process moves to Stella 7"3-7. If not, the process goes to step 7' 3- Return to IK. What was explained above Kj: fi, the setter can easily determine whether the set value has an operating value error within ±5% or not, and the setter's misunderstanding can be avoided. The above explanation is for OC relays, but it goes without saying that the same applies to undervoltage relays, overvoltage relays, distance relays, etc. Furthermore, regarding other embodiments. This will be explained using Fig. 4. Stellar f4-1 to Stellar f4'-6 are the same processes as Step 2-1 to Stellar f2-6 in Fig. 2. In Step 4-7, The alarm LED will light up to notify the person who set the setting value of the alarm.

Although FIG. 4 is a modification of FIG. 2, it goes without saying that the modification of FIG. 3 and the Stella f3-8 in FIG. 3 may be replaced in step 4-7.

As described above, the same effects as those of the embodiments described so far can be obtained.

〔Effect of the invention〕

As mentioned above, according to the present invention, when setting the setting value,
When a value that should be taken care of in relay operation is set, by calling the setter's attention, it is possible to prevent erroneous setting of the set value, and it is possible to prevent IE from malfunctioning the relay.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a flowchart explaining the operation in the configuration of FIG. 1, FIG. 3 is a flowchart explaining the operation of another embodiment of the invention, and FIG. FIG. 5 is a flowchart illustrating the operation of still another embodiment of the invention, FIG. 5 is a configuration diagram of the conventional example, and FIG. 6 is a flowchart illustrating the operation of the conventional example. DESCRIPTION OF SYMBOLS 1...r Izotal arithmetic processing part, 2... Setting part, 3... Numeric value setting circuit, 4...
...Selection circuit, 5.Memory circuit, 6.Switch, 7.Control circuit, 8.Display circuit, 9.Path, 10.Input converter,
11... Diphtal type differential relay, 12... Relay determination section. Agent Patent Attorney Kensuke Chika Agent Patent Attorney Ken Daikomaru Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) selection means for selecting a relay setting element; numerical setting means for setting a setting value for the relay setting element;
The selected relay comprises a display means for displaying the set value set by the numerical value setting means, a storage means for storing the set value set by the numerical value setting means, and a control means for controlling each of the above processes. In a setting method of a digital protective relay device in which setting values are set and displayed for elements, the value calculated by the combination of multiple setting values set by the setting means may be inconvenient in arithmetic processing. A setting method for a digital protective relay device, characterized in that when it is determined that the above-mentioned display means issues an alarm. (2) A setting method for a digital protective relay device according to claim 1, wherein the alarm by the display means is issued by flickering a set value or by lighting a warning LED.