JP2000184573A - Protective relay device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a protective relay device wherein the present state of operation of the protective relay device is understood at a glance because of graphically expressed logic circuits and the state of operation of equipment is effectively grasped. SOLUTION: A protective relay device 1A judges the occurrence of an accident in a power system from quantities of electricity, such as voltage and current, of the power system, and promptly isolates the section of the accident to protect the power system equipment and facilities. The protective relay device is provided with a logical status storing section 15 which stores the present logical status of the equipment, and a logic sequence display section 16 which displays the result in logic circuit representation. Logical condition results judged at an accident detection sequence portion 10 are stored at the logical status storing section 15, and the result is displayed at the logic sequence display section 16 in logic circuit diagram representation at a level equivalent to elementary wiring diagrams. As a result, the present status of operation of the protective relay device 1A is recognized at a glance, and testing time for operational verification and the like is significantly reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective relay for detecting a system fault in a power system, opening a circuit breaker and isolating the fault to protect components and equipment of the power system.

[0002]

2. Description of the Related Art The basic configuration and operation of a conventional protective relay device in a power system will be described with reference to the diagram of the power system shown in FIG. 5 and the diagram of the display unit shown in FIG. The protective relay device 1 includes a power system line 2 and a bus 3
From the power system including the line 2 and the circuit breaker 4 for separating the bus 3 from the main P which is a voltage converter.
The system voltage V is passed via T5 to the main CT6
, The system current I is input. The input electric quantities of the voltage V and the current I are taken into the input converter 7, converted into values suitable for input to the next main detection relay unit 8 by the internal auxiliary PT and auxiliary CT, and output.

[0003] The main detection relay unit 8 has a detection unit that operates based on an electric quantity input from the input converter 7 and based on a predetermined algorithm. Detect disturbances.

[0004] As a relay constituting the detection unit, for example, a relay (overvoltage relay) that operates when the voltage value exceeds a set certain value, and a relay that operates when the voltage value drops below a certain fixed value, for example. (Undervoltage relay),
A relay that operates when the current value exceeds a certain set value (overcurrent relay), a relay that detects the frequency of the system (frequency relay), and a relay that detects the direction in which the fault current flows in an accident (direction relay) ) And a relay (distance relay) that detects the distance to the accident point. In addition, the protection relay device 1 has an input unit 9 for inputting the ON state of the circuit breaker 4 and the operation state of other devices and devices in addition to the voltage V and the current I.

The operation results of various relays from the main detection relay section 8 and external conditions (D / I input) from the input section 9 are input to an accident detection sequence section 10 constituting a logic circuit as shown in FIG. Then, based on these conditions, the state of the accident (position and size of the accident point, etc.) is logically determined, and it is determined whether or not the circuit breaker 4 is cut off (tripped). Calling).

As a result of the judgment by the accident detection sequence unit 10, if the logical condition for shutting off the circuit breaker 4 is satisfied,
A trip command output (D / O output) for operating a trip relay for interruption is performed to the output unit 11, and the circuit breaker 4 is opened to isolate an accident section.

Various relay operation results based on these conditions determined by the accident detection sequence unit 10 are displayed on the display unit 1.
2 is output to the LED display unit 13, and the result of the determination is output to the oscilloscope signal output unit 14 and displayed as an oscilloscope, thereby confirming the operation of the protection relay device.

[0008]

As described above, in the conventional protection relay device 1, the means for recognizing the current operation state (state of each condition) of the accident detection sequence unit 10 of the protection relay device. The operating state of the main detection relay unit 8 is visually determined by the LED display unit 13 of the display unit 12, and the conditions of each unit of the accident detection sequence unit 10 are visually determined by the waveform output to the oscilloscope signal output unit 14 of the display unit 12. The operation is determined while sequentially checking the logic sequence described on the drawing (generally called a development connection diagram).

In recent years, the protection relay device has been applied from a mere relay device to a control device of the entire power system with the increase in integration of semiconductor elements such as a microprocessor and a memory, and an inherent process corresponding to a system function has increased. Therefore, the opportunity to change the soft logic in accordance with the change of the system is increasing. Therefore, there has been a demand for an efficient method for verifying the suitability of software change and processing.

However, since there is no function that allows the operator to recognize at a glance that the operation state of the accident detection sequence unit 10 is a logic circuit expression similar to that of the developed connection diagram, the operation check test of the protection relay device 1 and the like are not performed. It has taken an enormous amount of time, and there has been a demand for the development of a protective relay device that can efficiently check the operation.

The present invention (corresponding to claims 1 and 2) provides
The purpose was to address the above situation, and the purpose was to have a function that allows the current operating state of the protective relay device to be understood at a glance in a logical circuit diagram representation, and to efficiently grasp the operating state of the device. It is to provide a protective relay device that can be used.

[0012]

According to a first aspect of the present invention, an electric quantity such as a voltage or a current of a power system is inputted, and these input conditions are determined in advance. Judging that an accident has occurred in the power system under the condition that the logical conditions are satisfied, and by opening the circuit breaker, the accident section is quickly separated to protect the power system components and equipment. A logic state storage unit for storing what kind of logic state the protection relay device is currently in, and a logic sequence display unit for displaying a result of determination of the logic state storage unit in a logic circuit expression. And

According to the first aspect, the result of the logic condition determined by the accident detection sequence unit in the current operation state of the protection relay is stored in the logic state storage unit, and the result is expanded and connected to the logic sequence display unit. By displaying in the form of a logic circuit diagram at the same level as the figure and clearly indicating the condition part that is satisfied with bold lines, it is not necessary to collate the operation with the expanded connection diagram at hand, and the current operation of the device at a glance Recognition is possible. For this reason, the test time for operation confirmation and the like is greatly reduced.

According to a second aspect of the present invention, in the protection relay device according to the first aspect, a storage timing setting unit that stores a logic state of the protection relay device at an arbitrary timing, and stores a logic state at this timing. And a nonvolatile logic state storage unit configured by a nonvolatile memory that can be recalled even after the power of the apparatus is lost.

According to the second aspect, the past operation state of the accident detection sequence unit of the protection relay device can be stored at an arbitrary time or the like, and the result can be displayed again on the logic sequence display unit so that the occurrence of the accident can be prevented. The operation of the apparatus can be grasped, and the analysis function is improved.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a power system to which a protection relay device according to a first embodiment (corresponding to claim 1) of the present invention is applied, and has the same components as those of the conventional protection relay device of FIG. Are denoted by the same reference numerals, and redundant description is omitted.

As shown in the drawing, in the protection relay device 1A according to the present embodiment, the operation state (state in which each condition is satisfied) is further input from the accident detection sequence unit 10 to the configuration of the conventional protection relay device 1. A logic state storage unit 15 and a logic sequence display unit 16 for displaying the result on a human interface (HI) screen or the like are added.

Next, the operation of the present embodiment will be described with reference to FIG. In practice, the processing performed by the accident detection sequence unit 10 is sequentially performed in real time by a program using a built-in microprocessor or the like.

The relay operation result and the like from the main detection relay section 8 are indicated by LEDs mounted on the front panel of the protection relay 1.
It is displayed on the display unit 13. Alternatively, a halfway (point) result logically determined by the program is output to the oscilloscope signal output unit 1 by outputting a waveform signal to an externally connected oscilloscope display as necessary.
4 is output.

In this embodiment, in addition to the output display of the LED display 13 and the oscilloscope signal output unit 14, P1 to P11...
All n are stored in a new logic state storage unit 15 including a storage element such as a random access memory (RAM). Further, the logic sequence display section 16
Then, a logic circuit diagram (logic sequence) equivalent to that described in a drawing such as a development connection diagram programmed by the accident detection sequence unit 10 is displayed, and the result stored in the logic state storage unit 15 is input. , The current operating state of the protective relay is displayed in real time. For example, the point Pn where the condition is satisfied can be displayed in a bold line, another color (red), or blinking (flicker) to distinguish it from the unsatisfied point. The operating state of the device can be recognized.

As described above, according to the present embodiment, the current operation state of the protection relay is determined by the accident detection sequence unit 1.
The logic condition result determined at 0 is stored in the logic state storage unit 15, and the result is displayed on the logic sequence display unit 16 in the form of a logic circuit diagram at the same level as that of the expanded connection diagram. Since it is clearly indicated on the display etc., unlike the conventional protective relay device, there is no need to collate the operation with the expanded connection diagram at hand, it is possible to recognize the current operation of the protective relay device at a glance, and check the operation Etc., the test time is greatly reduced.

FIG. 3 is a configuration diagram of a power system to which a protection relay device according to a second embodiment (corresponding to claim 1) of the present invention is applied. This embodiment is different from the first embodiment of FIG. The configuration is that the logic sequence display unit is configured by an external device such as a general-purpose personal computer, and the other configurations are the same. Therefore, the same components are denoted by the same reference numerals, and redundant description will be omitted.

As shown in the figure, in the protection relay device 1B of this embodiment, the logic sequence display unit 16 is constituted by an external device such as a general-purpose personal computer, so that the logic sequence display unit 16 is always protected by the protection relay. The power unit 1 is separately connected without being connected to the power unit 1, and is used by connecting with a cable such as 10BASE-T when necessary at the time of a test or the like.

According to the present embodiment, in addition to obtaining the same operation as that of the first embodiment, the logic sequence display section 16 is always provided separately from the protection relay device 1B, so that the logic sequence display section 16 can be used at the time of a test or the like. When necessary, it can be easily connected with a cable or the like, and the structure of the protective relay device can be simplified and reduced. Further, the operating state of the protection relay device can be monitored in a place easily monitored by a cable.

FIG. 4 is a configuration diagram of a power system to which a protection relay device according to a third embodiment (corresponding to claim 2) of the present invention is applied. This embodiment is different from the first embodiment of FIG. The configuration is such that a storage timing setting unit and a non-volatile logic state storage unit are added, and the other configurations are the same. Therefore, the same components are denoted by the same reference numerals and redundant description is omitted.

As shown in the figure, in the protection relay device 1C of the present embodiment, the configuration of the protection relay device 1A of the first embodiment of FIG. Timing setting unit 17 that can set an arbitrary timing of
And a non-volatile logic state storage unit 18 composed of a non-volatile memory such as an EEPROM capable of storing the operation state of the accident detection sequence unit 10 of the protection relay device 1 at that time even when the power of the device is lost. Have been.

According to this embodiment, in addition to obtaining the same operation as the first embodiment, the operation of the accident detection sequence unit 10 can be stored at an arbitrary timing by the storage timing setting unit 17, and the result can be stored in the logic sequence. By redisplaying the information on the display unit, the operation of the device at the time of occurrence of an accident or the like can be grasped, so that the function of analyzing a system accident can be improved.

[0028]

As described above, the present invention (Claim 1)
According to claim 2), the state of establishment of each condition determined by the accident detection sequence unit is individually stored in the logical state storage unit, and the result is output to the logic sequence display unit, so that protection relay is performed. The current operation state of the device can be drawn and displayed in a logic circuit diagram expression similar to the developed connection diagram.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a power system to which a protection relay device according to a first embodiment of the present invention is applied.

FIG. 2 is a configuration diagram of a display unit in FIG. 1;

FIG. 3 is a configuration diagram of a power system to which a protection relay device according to a second embodiment of the present invention is applied.

FIG. 4 is a configuration diagram of a power system to which a protection relay device according to a third embodiment of the present invention is applied.

FIG. 5 is a configuration diagram of a power system to which a conventional protection relay device is applied.

FIG. 6 is a configuration diagram of a conventional display unit.

[Explanation of symbols]

1, 1A, 1B, 1C ... protective relay device, 2 ... line, 3 ...
Bus bar, 4 breaker, 5 main PT, 6 main CT, 7 input converter, 8 main detection relay unit, 9 input unit, 10 accident detection sequence unit, 11 output unit, 12 display Part, 13
... LED display section, 14 ... Oscilloscope signal output section, 15 ... Logic state storage section, 16 ... Logic sequence section, 17 ... Storage timing setting section, 18 ... Non-volatile logic state storage section, P
1 to Pn ... Logical condition points.

Claims (2)

[Claims] 1. An electric quantity such as a voltage and a current of a power system is inputted, and it is determined that an accident has occurred in the power system on condition that these input conditions satisfy predetermined logical conditions. In a protective relay device for quickly separating an accident section by opening a circuit breaker and protecting components and equipment of a power system, a logical state storing the logical state of the protective relay device at present. A protection relay device comprising: a storage unit; and a logic sequence display unit that displays a determination result of the logical state storage unit in a logic circuit expression. 2. The protection relay device according to claim 1, wherein
A storage timing setting unit that stores a logic state of the protection relay device at an arbitrary timing; and a nonvolatile logic state including a nonvolatile memory that can recall the logic state at this timing even after the device power is lost. A protective relay device comprising a storage unit.