WO2019234927A1

WO2019234927A1 - Electronic circuit breaker

Info

Publication number: WO2019234927A1
Application number: PCT/JP2018/022086
Authority: WO
Inventors: 幸樹原田; 野村　敏光; 雄介瀧川; 聖崇近井; 知是渡辺
Original assignee: 三菱電機株式会社
Priority date: 2018-06-08
Filing date: 2018-06-08
Publication date: 2019-12-12
Also published as: JPWO2019234927A1; JP6947302B2; TWI686027B; CN112236914A; TW202002443A

Abstract

This electronic circuit breaker 400 is provided with: an open/close contact 2 for opening and closing an electrical path 1; a current detection device 3 for detecting the current of the electrical path 1; a setting unit 5 for setting an instantaneous tripping characteristic, a short time-limit tripping characteristic, and a long time-limit tripping characteristic for opening the open/close contact 2 in accordance with the current flowing through the electrical path 1; a first microcomputer 10 receiving the output signal of the current detection device 3 and outputting an instantaneous tripping signal; a second microcomputer 20 connected to the setting unit 5, transmitting the instantaneous tripping characteristic to the first microcomputer 10, and acquiring information of the current flowing through the electrical path 1 from the first microcomputer 10 and outputting a time-limit tripping signal; a tripping device 7 for opening the open/close contact 2 on the basis of the instantaneous tripping signal S1 and the time-limit tripping signal S2; and a current information processing unit for acquiring the current information of the electrical path 1 from the first microcomputer 10 and displaying or externally outputting the current information.

Description

Electronic circuit breaker

The present invention relates to an electronic circuit breaker equipped with a plurality of microcomputers and capable of displaying a current waveform flowing in an electric circuit.

The electronic circuit breaker has overcurrent trip characteristics that are roughly classified into instantaneous trip characteristics, short time trip characteristics, and long time trip characteristics, and these overcurrent trip characteristics are processed by a single microcomputer. It is common (see, for example, Patent Document 1 and Patent Document 2).
An electronic circuit breaker provided with a display unit connected to a microcomputer for processing overcurrent trip characteristics, and displaying current-carrying information such as each phase current value, average current value, and leakage current value on this display unit Is also known (see, for example, Patent Document 3).

JP-A-8-331748 JP 2002-186168 A JP 2008-204630 A

Processing of overcurrent trip characteristics in conventional electronic circuit breakers requires different processing for each model, such as display unit settings such as display and setting of trip characteristics, pre-alarm display, rated over display, and energization information display. Therefore, in a model having many functions, the burden on the microcomputer increases. However, since the electronic circuit breaker requires a short operation of several tens of msec from turning on the circuit breaker to opening the switching contact as in the case of the instantaneous trip characteristic, the microcomputer circuit accompanying the increase in the load is required. An increase in processing time becomes a problem.

The present invention has been made to solve such a problem, and in an electronic circuit breaker that realizes an overcurrent trip characteristic by a microcomputer, the processing time is shortened and the operation in a required short time is achieved. The purpose is to provide a possible and highly reliable electronic circuit breaker.

An electronic circuit breaker according to the present invention includes an open / close contact that opens and closes an electric circuit, a current detection device that detects an electric current in the electric circuit, and an instantaneous trip characteristic for opening the open / close contact according to the current flowing through the electric circuit. A setting unit for setting a time-delay trip characteristic and a long-time trip characteristic, a first microcomputer for inputting an output signal of the current detection device and outputting an instantaneous trip signal, and a setting unit are connected, and an instantaneous trip is established. A second microcomputer for transmitting the trip characteristic to the first microcomputer, acquiring information on the current flowing through the electric circuit from the first microcomputer and outputting a time trip signal, an instantaneous trip signal and a time trip signal And a trip device that opens the switching contact based on the momentary trip signal and a trip device that opens based on the instantaneous trip signal and the timed trip signal. A current information processing section for outputting a current waveform display, or outside in the path to, those having a.

According to the electronic circuit breaker according to the present invention, since the A / D conversion unit, the calculation unit, the trip processing unit, and the current information processing unit are shared by the plurality of microcomputers, the burden on each microcomputer is reduced. The processing time can be shortened.

1 is a block diagram of an electronic circuit breaker according to Embodiment 1 of the present invention. It is a functional block diagram which shows the function of the microcomputer in the electronic circuit breaker shown in FIG. It is explanatory drawing for demonstrating the FIFO table of the current information processing part shown in FIG. It is a block diagram of the electronic circuit breaker which concerns on Embodiment 2 of this invention. It is a functional block diagram which shows the function of the microcomputer in the electronic circuit breaker shown in FIG. It is a figure which shows the structure of the digital signal D1 with a tag which is the output data of the tag data provision part in the electronic circuit breaker shown in FIG. It is a figure which shows the structure of the tagged maximum value data D2 which is the output data of the maximum value calculating part in the electronic circuit breaker shown in FIG. It is a figure which shows the structure of the tagged effective value data D3 which is the output data of the effective value calculating part in the electronic circuit breaker shown in FIG. It is explanatory drawing for demonstrating the FIFO table of the current information processing part shown in FIG. It is a diagram showing a configuration of INST tag data T _I is the output data of the instantaneous tripping unit in electronic circuit breaker shown in FIG. Is a diagram illustrating a short of time-limit tripping is the output data of the processing unit SHORT tag data T _S configuration in the electronic circuit breaker shown in FIG. It is a figure which shows the structure of the LONG tag data _TL which is the output data of the long time delay trip process part in the electronic circuit breaker shown in FIG. It is a functional block diagram which shows the function of the microcomputer in the electronic circuit breaker concerning Embodiment 3 of this invention. It is a figure which shows the structure of the digital signal E1 with a tag which is the output data of the tag data provision part in the electronic circuit breaker shown in FIG. It is explanatory drawing for demonstrating the FIFO table of the current information processing part shown in FIG. Is a diagram showing a configuration of INST tag data T _I is the output data of the instantaneous tripping unit in electronic circuit breaker shown in FIG. 13. It is a figure which shows the structure of the maximum value data E2 which is the output data of the maximum value calculating part in the electronic circuit breaker shown in FIG. Is a diagram illustrating a short of time-limit tripping is the output data of the processing unit SHORT tag data T _S configuration in the electronic circuit breaker shown in FIG. 13. It is a figure which shows the structure of the effective value data E3 which is the output data of the effective value calculating part in the electronic circuit breaker shown in FIG. It is a figure which shows the structure of the LONG tag data _TL which is the output data of the long time delay trip processing part in the electronic circuit breaker shown in FIG.

Embodiments of an electronic circuit breaker according to the present invention will be described below with reference to the drawings. In addition, in each figure, the same code | symbol has shown the same or an equivalent part.

Embodiment 1 FIG.
1 is a block diagram of an electronic circuit breaker 400 according to Embodiment 1, FIG. 2 is a functional block diagram showing functions of a microcomputer in the electronic circuit breaker shown in FIG. 1, and FIG. 3 is a current diagram shown in FIG. It is explanatory drawing for demonstrating the First In First Out (henceforth FIFO) table of an information processing part, (a) is description of this time, (b) is description of the next time, (c) is description of successive times. .

As shown in FIG. 1, an electronic circuit breaker 400 according to the present embodiment outputs a current signal proportional to a load current that is provided in the electric circuit 1 and an open / close contact 2 that opens and closes the electric circuit 1. A current detection device 3; a current detection circuit 4 that converts a current signal output from the current detection device 3 into an analog voltage signal; a setting unit 5 that sets data of an overcurrent trip characteristic; and an analog of the current detection circuit 4 A first microcomputer 10 (hereinafter referred to as a first microcomputer 10) that performs instantaneous trip characteristic processing (for example, a cycle of 1 msec) that requires high-speed processing based on a voltage signal, and communication from the first microcomputer 10 by communication. A signal of the load current flowing in the electric circuit 1 is acquired to process a relatively slow short time / long time trip characteristic (for example, 12.5 ms cycle), and an overcurrent trip characteristic set by the setting unit 5 By a second microcomputer 20 (hereinafter referred to as a second microcomputer 20) that performs a setting process (for example, a cycle of 100 milliseconds) for storing the data, and each trip signal from the first microcomputer 10 and the second microcomputer 20 A tripping circuit 6 that drives the tripping device 7 to open the switching contact 2 and a display unit 8 that is connected to the second microcomputer 20 and displays current information of the electric circuit 1 are configured.

The first microcomputer 10 includes a CPU 101, a ROM 102, and a RAM 103 that constitute a microcomputer, an A / D conversion circuit 104 that converts an analog voltage signal from the current detection circuit 4 into a digital signal at a cycle of, for example, 500 microseconds, and the like. The first communication circuit 105 for receiving setting data from the second microcomputer 20 at the time of startup and periodically communicating with the second microcomputer 20 and the output port 106 for driving the tripping circuit 6 are configured. ing.

Similarly to the first microcomputer 10, the second microcomputer 20 includes a CPU 201, a ROM 202, and a RAM 203, a setting input unit 204 that reads setting data from the setting unit 5, and a first communication circuit of the first microcomputer 10. The first communication circuit 205 for periodically communicating with 105, the output port 206 for driving the trip circuit 6, and the current information of the electric circuit from the first microcomputer 10 are obtained, and the current information is displayed on the display unit 8. And a display output unit 207 to be operated.

Next, functional blocks that are processed by software of the first microcomputer 10 and the second microcomputer 20 will be described.
As shown in FIG. 2, the software processing 108 performed by the CPU 101 of the first microcomputer 10 is the digital signal from the A / D conversion circuit 104 and the instantaneous trip characteristic acquired from the second microcomputer 20 via the first communication circuit 105. The instantaneous trip processing unit 108a for outputting an instantaneous trip signal from the output port 106 to the trip circuit 6 based on the data of the above, and a predetermined period of the load current flowing in the electric circuit 1 based on the digital signal from the A / D conversion circuit 104 The maximum value calculation unit 108b that calculates the maximum value and transmits the maximum value to the second microcomputer 20 via the first communication circuit 105, and the load current flowing in the electric circuit 1 based on the digital signal from the A / D conversion circuit 104 An effective value calculation unit 108c that calculates an effective value and transmits the effective value to the second microcomputer 20 via the first communication circuit 105 is included.

Here, the predetermined period in which the maximum value calculation unit 108b calculates the maximum value is, for example, a half cycle of an AC voltage for an AC circuit, and 10 msec for a DC circuit. Further, the effective value calculated by the effective value calculation unit 108c is, for example, an effective value in one cycle of an AC voltage if an AC circuit, or an average value of the past 20 msec if a DC circuit.

The software processing 208 by the CPU 201 of the second microcomputer 20 includes a setting processing unit 208a for setting data of the instantaneous trip characteristic, the short time trip characteristic, and the long time trip characteristic set by the setting unit 5; A short-time trip processing unit 208b for outputting a time-delay trip signal S2 from the output port 206 to the trip circuit 6 based on the maximum load current value and short-time trip characteristics data from the first microcomputer 10; A long-time trip processing unit 208c that outputs a time-delay trip signal S2 from the output port 206 to the trip circuit 6 based on the effective value of the load current and the data of the long-time trip function, and the A / W of the first microcomputer 10 Current information for displaying a current waveform at the time of trip, a harmonic current of a load current, and the like on the display unit 8 based on a digital signal from the D conversion circuit 104. And the processing section 208d, is constructed from.

Next, each overcurrent tripping operation in the electronic circuit breaker 400 will be described.
First, in the instantaneous trip operation, a digital value corresponding to the current value converted by the A / D conversion circuit 104 is delivered to the instantaneous trip processing unit 108a. When the digital value exceeds the current region of the instantaneous trip characteristic, the instantaneous trip processing unit 108a outputs the instantaneous trip signal S1 from the output port 106 to the trip circuit 6.

Next, in the short time delay trip operation and the long time delay trip operation, the digital value corresponding to the current value converted by the A / D conversion circuit 104 is converted from the A / D conversion circuit 104 to the first communication circuit 105, The maximum value calculation unit 108b and the effective value calculation unit 108c are input. The maximum value calculation unit 108 b and the effective value calculation unit 108 c calculate the maximum value and the effective value in a predetermined cycle, respectively, and input these digital values to the first communication circuit 105. Current information such as the digital value, effective value, and maximum value of the A / D-converted load current is transferred from the first communication circuit 105 to the first communication circuit 205 of the second microcomputer 20 through communication in a predetermined cycle. Sent. The first communication circuit 205 delivers the received current information to the short time delay trip processor 208b and the long time trip processor 208c.

The short-time trip processing unit 208b and the long-time trip processing unit 208c operate according to the delivered current information, that is, the magnitude of the current signal output from the current detection device 3, and in the case of an overcurrent, After performing the time limit operation, a time limit trip signal S2 is output to the trip circuit 6 via the output port 206.
When the instantaneous trip signal S1 or the timed trip signal S2 is output from either the first microcomputer 10 or the second microcomputer 20, the trip circuit 7 is driven to excite the trip device 7, and the switching contact 2 is opened.

Next, an operation in which the current information processing unit 208d displays current information such as a current waveform on the display unit 8 at the time of interruption will be described.
As illustrated in FIG. 3, the current information processing unit 208 d of the second microcomputer 20 stores a digital value of a predetermined number of load currents, which are A / D converted, received from the first microcomputer 10 in a FIFO table. In the FIFO table of the current information processing unit 208d, when the FIFO table is full as shown in FIG. 3A and a new digital value (n + 1) is written, as shown in FIG. 3B. The digital value (1) which is the oldest data is updated so as to be deleted from the FIFO table.

Similarly, when the digital value (n + 2) which is new data is written in the next update, the digital value (2) which is the oldest data is erased from the FIFO table as shown in FIG. . For this reason, the FIFO table stores digital values of old load currents up to a predetermined number before the latest digital value of load current. The FIFO table is configured in the ROM 202 or the RAM 203.

When an instantaneous trip operation is performed, the instantaneous trip processing unit 108 a outputs an instantaneous trip signal S 1 to the trip circuit 6 and also instantaneously trips to the second microcomputer 20 via the first communication circuit 105. Send execution of removal operation. The first communication circuit 205 that has received the execution of the instantaneous trip operation further transmits the execution of the instantaneous trip operation to the current information processing unit 208d.
When the short time trip operation and the long time trip operation are performed, the short time trip processing unit 208b and the long time trip processing unit 208c output the time trip signal S2 to the trip circuit 6, respectively. At the same time, the execution of the short time trip operation and the execution of the long time trip operation are transmitted to the current information processing unit 208d.

The current information processing unit 208d to which execution of any one of the instantaneous trip operation, the short time trip operation, and the long time trip operation is transmitted stops updating the FIFO table and is stored in the FIFO table. The digital value of the load current is transmitted to the display unit 8 via the display output unit 207, and the current waveform in the electric circuit 1 from the predetermined time before the tripping device 7 opens the switching contact 2 to the opening is displayed on the display unit 8 To display.

Further, the current information processing unit 208d performs a Fourier transform on the digital value of the load current stored in the FIFO table, and then displays the harmonic on the electric circuit 1 by displaying it on the display unit 8 or outputting it externally. It is also possible to easily obtain current information.

In the present embodiment, the display unit 8 has been described as a display unit built in the electronic circuit breaker 400. However, the display unit 8 transmits various current information to the external display device by wireless communication or the like. Can also be displayed.

According to the electronic circuit breaker of the present embodiment, the output signal of the current detection device 3 is input, the first microcomputer 10 that outputs the instantaneous trip signal and the setting unit 5 are connected, and the instantaneous trip characteristic is obtained. Based on the second microcomputer 20 that transmits to the first microcomputer 10 and obtains current information flowing through the electric circuit 1 from the first microcomputer 10 and outputs a time-delay trip signal, and the instantaneous trip signal S1 and the time-delay trip signal S2. A tripping device 7 for opening the switching contact 2, and the second microcomputer 20 acquires current information of the electric circuit 1 from the first microcomputer 10 and displays or outputs the current information to the outside. Therefore, the processing load on each microcomputer can be reduced, and the processing time can be shortened and the used capacity of the internal memory can be reduced.

Further, the current information displayed or output to the outside by the current information processing unit 208d is the current waveform in the electric circuit 1 or the harmonic current of the electric circuit 1 from immediately before the tripping device 7 opens the switching contact 2 to the opening. The cause of the interruption by the electronic circuit breaker 400 can be easily grasped.

In the case of an electronic circuit breaker for an AC circuit, the power supply circuit uses the current signal output from the current detection device 3 that measures the current in the circuit 1 as a power source, but the long-term time when the current flowing through the circuit 1 is small. Even in the area of the trip characteristic, the processing load of each microcomputer is reduced, so that current consumption can be reduced, so that there is no possibility of power shortage, and the reliability of the electronic circuit breaker 400 can be improved. .

Embodiment 2. FIG.
FIG. 4 is a block diagram of the electronic circuit breaker according to the second embodiment, FIG. 5 is a functional block diagram showing functions of the microcomputer in the electronic circuit breaker shown in FIG. 4, and FIG. 6 is an electronic type shown in FIG. The figure which shows the structure of the digital signal D1 with a tag which is output data of the tag data provision part in a circuit breaker, FIG. 7 is the maximum value with a tag which is the output data of the maximum value calculating part in the electronic circuit breaker shown in FIG. FIG. 8 is a diagram showing a configuration of data D2, FIG. 8 is a diagram showing a configuration of tagged effective value data D3 that is output data of an effective value calculation unit in the electronic circuit breaker shown in FIG. 5, and FIG. 9 is a diagram showing the current shown in FIG. explanatory view for explaining the FIFO table of the information processing unit, 10 is a diagram showing a structure of INST tag data T _I is the output data of the instantaneous tripping unit in electronic circuit breaker shown in FIG. 5, FIG. 1 1 is a diagram showing a structure of SHORT tag data T _S is the output data of the Short-time tripping processing unit in electronic circuit breaker shown in FIG. 5, the length limit Toki引in Figure 12 electronic circuit breaker shown in FIG. 5 It is a figure which shows the structure of the LONG tag data _TL which is the output data of a removal process part.

The current information processing unit 208d in the first embodiment is provided in the second microcomputer 20, but the current information processing unit in the present embodiment is provided separately from the first microcomputer 10 and the second microcomputer 20. It is.
Also, the software processing 108 of the first microcomputer 10 adds tag data to the digital signal from the A / D conversion circuit 104, and the instantaneous trip processing unit 108a, the maximum value calculation unit 108b, the effective value calculation unit 108c, and the second 1 is provided with a tag data adding unit 108d that delivers a digital signal with tag data to one communication circuit 105.

As shown in FIG. 4, the electronic circuit breaker 500 in the present embodiment is connected to the first microcomputer 10 and the second microcomputer 20 by the first communication circuit 304 and the second communication circuit 305, respectively. A third microcomputer 30 (hereinafter referred to as a third microcomputer 30) is provided. The display unit 8 connected to the second microcomputer 20 in the first embodiment is connected to the third microcomputer 30.

The first microcomputer 10 is provided with a second communication circuit 107 for transmitting a digital signal with tag data to a current information processing unit 308 described later.
In addition, instead of the current information processing unit 208d and the display output unit 207 of the first embodiment, the second microcomputer 20 transmits tag information for informing the current information processing unit 308 of the timing at which the interruption is performed. Two communication circuits 107 are provided.

The third microcomputer 30 includes a CPU 301, a ROM 302, and a RAM 303 that form a microcomputer, a first communication circuit 304 for receiving a digital signal with tag data from the first microcomputer 10, and a second microcomputer 20. A second communication circuit 305 for receiving tag information at the time of blocking, an external output unit 306 for outputting current information to an external communication terminal, and a display output unit 307 for displaying current information on the display unit 8. Is provided.

Next, functional blocks that perform processing by software of the first, second, and

third microcomputers

10, 20, and 30 will be described.
As shown in FIG. 5, the current information processing unit 308, which is software processing by the CPU 301 of the third microcomputer 30, is applied to the display unit 8 based on the digital signal with tag data from the tag data adding unit 108d of the first microcomputer 10. The current waveform at the time of disconnection and the harmonic current of the load current are displayed.
In addition, about another structure, it is the same as that of Embodiment 1, and duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

Next, an operation in which the current information processing unit 308 displays current information such as a current waveform on the display unit 8 at the time of interruption will be described.
As shown in FIG. 5, the A / D conversion data d1 output from the A / D conversion circuit 104 is input to the maximum value calculation unit 108b, the effective value calculation unit 108c, and the tag data addition unit 108d.
In the tag data providing unit 108d, in addition to the A / D conversion data d1 received from the A / D conversion circuit 104, the tag data T2 received from the maximum value calculation unit 108b, and the tag data T3 received from the effective value calculation unit 108c, Further, the tag data T1 generated by the tag data adding unit 108d is added to generate the tagged digital signal D1 shown in FIG.

The tag data T1 is an integer with an initial value of 0, and is incremented by one each time the tag data adding unit 108d acquires A / D conversion data from the A / D conversion circuit 104. Details of the tag data T2 and T3 will be described later.
As shown in FIG. 5, the tagged digital signal D1 is output from the tag data adding unit 108d to the instantaneous trip processing unit 108a and the second communication circuit 107.
The second communication circuit 107 that has received the tagged digital signal D1 transmits the tagged digital signal D1 to the current information processing unit 308 via the first communication circuit 304 of the third microcomputer 30.

In the maximum value calculation unit 108b, the maximum value data d2 of the current in the first predetermined period (for example, 40 msec, which is four times 10 msec which is a half period of 50 Hz) is calculated from the A / D conversion data d1, and the calculated maximum Tag data T2 is added to the value data d2, and maximum value data D2 with tag shown in FIG. 7 is generated.
The tag data T2 is an integer with an initial value of 0, and is incremented by one for each first predetermined period in which the maximum value calculation unit 108b performs the maximum value calculation.
The tag data T2 is output from the maximum value calculation unit 108b to the tag data adding unit 108d, and is used by the tag data adding unit 108d to generate the tagged digital signal D1. The tagged maximum value data D2 generated by the maximum value calculator 108b is transmitted from the maximum value calculator 108b to the second microcomputer 20 via the first communication circuit 105.

The effective value calculation unit 108c calculates the effective value of the current in the second predetermined period (for example, 100 msec which is the least common multiple of the 50 Hz period and the 60 Hz period) from the A / D conversion data d1, and calculates the calculated effective value. The tag data T3 is added to the data d3, and the tagged effective value data D3 shown in FIG. 8 is generated.
The tag data T3 is an integer with an initial value of 0, and is assumed to be advanced by one every second predetermined period in which the effective value calculation unit 108c calculates the effective value of the current.
The tag data T3 is output from the effective value calculation unit 108c to the tag data adding unit 108d, and is used by the tag data adding unit 108d to generate the tagged digital signal D1. The tagged effective value data D3 generated by the effective value calculation unit 108c is transmitted from the effective value calculation unit 108c to the second microcomputer 20 via the first communication circuit 105.

As shown in FIG. 9, the current information processing unit 308 divides the tagged digital signal D1 received from the first microcomputer 10 into A / D conversion data d1 and tag data T1, T2, T3 and stores them in the FIFO table. .
In the FIFO table of the current information processing unit 308, when the digital value (n + 1) that is new data is written while the FIFO table is full, the digital value 1 that is the oldest data and its tag data are erased from the FIFO table. To be updated. For this reason, the FIFO table stores a digital value of an old load current dating back a predetermined number from the latest digital value of the load current. The FIFO table is configured in the ROM 302 or the RAM 303.

In addition, the “tagged current signal data” described in the claims means the tagged digital signal D1, the tagged maximum value data D2, and the tagged effective value data D3.

Next, the instantaneous trip operation will be described.
The instantaneous trip processing unit 108a that receives the tagged digital signal D1 from the tag data adding unit 108d outputs an output port when the A / D conversion data d1 of the tagged digital signal D1 exceeds the current region of the instantaneous trip characteristic. After outputting the instantaneous trip signal S1 from 106 to the trip circuit 6, the tag data T1 given to the digital signal D1 with tag at that time is extracted, and the data type INST is given to the tag data T1. as a form of INST tag data _{T I} shown in 10 through the first communication circuit 105 transmits to the second microcomputer 20.

The first communication circuit 205 of the second microcomputer 20 receives the INST tag data _{T I} from the instantaneous tripping unit 108a, via the second communication circuit 209, the INST tag data _{T I} to the third microcomputer 30 Send.
The second communication circuit 305 of the third microcomputer 30 that has received the INST tag data _{T I} from the second microcomputer 20, by passing the INST tag data _{T I} to the current information processing unit 308, and the instantaneous tripping by the first microcomputer 10 Notify tag data when is executed.

Current information processing unit 308 receives the INST tag data _{T I} is to stop updating the FIFO table shown in FIG. 9, the tag data portion of INST tag data _{T I} and the received tag data T1 stored in the FIFO table And the corresponding A / D conversion data d1 before the matching tag data is transmitted to the display unit 8 via the display output unit 307, and the tripping device 7 is opened from a predetermined time before the switching contact 2 is opened. The current waveform in the electric circuit 1 until this is displayed on the display unit 8.
Similarly, the current information processing unit 308 is connected to an external communication terminal from the external output unit 306 in the electric circuit 1 until the tripping device 7 opens the switching contact 2 by a wireless communication or the like until a predetermined time before it opens. It is also possible to transmit current waveform data and display the current waveform on an external communication terminal.

Next, the short time trip operation will be described.
When the short time delay trip processing unit 208b of the second microcomputer 20 receives the tagged maximum value data D2 from the maximum value calculation unit 108b via the first communication circuit 205, the short time delay trip set by the setting processing unit 208a. Compared with the release characteristic data, if it is an overcurrent, after a time limit operation is performed, a time limit trip signal S2 is output to the trip circuit 6 via the output port 206. Further, the short time delay trip processing unit 208b extracts the tag data T2 from the tagged maximum value data D2 for which the time delay trip signal S2 is to be output, and assigns the data type SHORT to the tag data. as SHORT tag data _{T S} of the type shown in 11 through the second communication circuit 209 transmits to the third microcomputer 30.

The second communication circuit 305 which receives the SHORT tag data _{T S} from the second microcomputer 20, by passing the SHORT tag data _{T S} to the current information processing unit 308, a short time limit tripping operation is executed by the second microprocessor 20 Notify the tag data at the time.

Current information processing unit 308 that has received the SHORT tag data _{T S} stops updating the FIFO table shown in FIG. 9, the tag data portion of the SHORT tag data _{T S} and the received tag data T2 stored in the FIFO table And the corresponding A / D conversion data before the matching tag data is transmitted to the display unit 8 via the display output unit 307, and the tripping device 7 is opened from a predetermined time before the switching contact 2 is opened. The current waveform in the electric circuit 1 until is displayed on the display unit 8.
Similarly, the current information processing unit 308 is connected to an external communication terminal from the external output unit 306 in the electric circuit 1 until the tripping device 7 opens the switching contact 2 by a wireless communication or the like until a predetermined time before it opens. Current waveform data can also be transmitted.

Next, the long time delay trip operation will be described.
When the long time delay trip processing unit 208c of the second microcomputer 20 receives the tagged effective value data D3 from the effective value calculation unit 108c via the first communication circuit 205, the long time delay trip set by the setting processing unit 208a. Compared with the release characteristic data, if it is an overcurrent, after a time limit operation is performed, a time limit trip signal S2 is output to the trip circuit 6 via the output port 206. Further, the long time delay trip processing unit 208c extracts the tag data T3 from the tagged effective value data D3 that is to output the time delay trip signal S2, and assigns the data type LONG to the tag data. 12 is transmitted to the third microcomputer 30 via the second communication circuit 209 as LONG tag data _{TL in the} format shown in FIG.

The second communication circuit 305 that has received the LONG tag data _TL from the second microcomputer 20 passes the LONG tag data _TL to the current information processing unit 308, so that the second microcomputer 20 performs a long time delay trip operation. Notify the tag data at the time.

The current information processing unit 308 that has received the LONG tag data _TL stops updating the FIFO table shown in FIG. 9, and the tag data T3 stored in the FIFO table and the tag data portion of the received LONG tag data _TL And the corresponding A / D conversion data before the matching tag data is transmitted to the display unit 8 via the display output unit 307, and the tripping device 7 is opened from a predetermined time before the switching contact 2 is opened. The current waveform in the electric circuit 1 until is displayed on the display unit 8.

Similarly, the current information processing unit 308 is connected to an external communication terminal from the external output unit 306 in the electric circuit 1 until the tripping device 7 opens the switching contact 2 by a wireless communication or the like until a predetermined time before it opens. Current waveform data can also be transmitted.
When the instantaneous trip signal S1 or the timed trip signal S2 is output from either the first microcomputer 10 or the second microcomputer 20, the trip circuit 7 is driven to excite the trip device 7, The switching contact 2 is opened.

According to the electronic circuit breaker of the present embodiment, the current signal output from the current detection device 3 is input, the first microcomputer 10 that outputs the instantaneous trip signal and the setting unit 5 are connected, and the instantaneous trip is performed. The characteristics are transmitted to the first microcomputer 10, and the second microcomputer 20 that acquires the current information flowing through the electric circuit 1 from the first microcomputer 10 and outputs the time trip signal, the instantaneous trip signal S1, and the time trip signal S2 A tripping device 7 that opens the switching contact 2 on the basis, a third microcomputer 30 having a current information processing unit 208d that acquires current information of the electric circuit 1 from the first microcomputer 10 and displays or outputs the current information to the outside; Thus, the processing load on each microcomputer is reduced, and the processing time can be shortened and the used capacity of the internal memory can be reduced.

Further, the current information displayed or output to the outside by the current information processing unit 208d is the current waveform in the electric circuit 1 or the harmonic current of the electric circuit 1 from immediately before the tripping device 7 opens the switching contact 2 to the opening. The reason why the electronic circuit breaker 500 has shut off can be easily grasped.

Further, the first microcomputer 10 uses the tag data T1 indicating the timing at which the current signal proportional to the current signal output from the current detection device 3 is A / D converted, and the timing at which the maximum value is calculated by the maximum value calculation unit 108b. The tagged digital signal D1 to which the tag data T2 indicating the timing at which the effective value is calculated by the effective value calculation unit 108c and the tag data T3 indicating the timing at which the effective value is calculated by the effective value calculation unit 108c is generated. The tag data adding unit 108d that transmits the signal D1 and the instantaneous trip signal S1 when the instantaneous trip is performed are output to the current information processing unit 308 of the third microcomputer 30 via the second microcomputer 20 and the INST tag. with the instantaneous tripping unit 108a for transmitting data T _I, the second microcomputer 20, Kiriji when performing short time-limit tripping Tripping outputs a signal S2, and during the short limit tripping unit 208b for transmitting SHORT tag data T _S to the current information processing unit 308 outputs the time-limit tripping signal S2 when performing long-time tripping, A long time delay trip unit 208c for transmitting the LONG tag data _TL to the current information processing unit 308, and the third microcomputer 30 converts the INST tag data T _I , SHORT tag data T _S , and LONG tag data _TL On the basis of the current information processing unit 308 that displays or outputs the current waveform in the electric circuit 1 from the predetermined time before the tripping device 7 opens the switching contact 2 until it opens, the trip signal is sent to the first microcomputer. 10 and the second microcomputer 20 need not be separately input to the third microcomputer 30, and the number of ports to be used can be reduced.

Further, the third microcomputer 30 displays the current waveform in the electric circuit 1 from the predetermined time before the tripping device 7 opens the switching contact 2 based on the respective tag data T _I , T _S , T _L or until it is opened. Therefore, the communication between the first microcomputer 10 and the third microcomputer 30 and the communication between the second microcomputer 20 and the third microcomputer 30 do not need to be synchronized. The period can be adopted, and the reliability of the electronic circuit breaker as a whole can be improved.

Embodiment 3 FIG.
FIG. 13 is a functional block diagram showing the function of the microcomputer in the electronic circuit breaker according to the third embodiment, and FIG. 14 is a diagram showing the configuration of the tagged digital signal E1 that is output data of the tag data adding unit shown in FIG. FIG 15 is an explanatory diagram for describing a FIFO table of the current information processing unit shown in FIG. 13, FIG. 16 showing the INST tag data T _I structure which is the output data of the instantaneous tripping unit shown in FIG. 13 FIG. 17 is a diagram showing the configuration of tagged maximum value data E2 that is output data of the maximum value calculation unit shown in FIG. 13, and FIG. 18 is SHORT tag data that is output data of the short time trip processing unit shown in FIG. diagram illustrating the configuration of a T _S, 19 figures, FIG. 20 showing the configuration of a tagged effective value data E3 is output data of the effective value calculation section shown in FIG. 13 is long-time tripping 13 It is a diagram showing a configuration of a LONG tag data T _L which is the output data of the processing section.

In the present embodiment, the three types of tag data T1 to T3 used in the second embodiment are used as one type of tag data. Therefore, the block diagram showing the configuration of the electronic circuit breaker 600 in the present embodiment is the same as that shown in FIG.

Next, functional blocks that are processed by software of the first, second, and

third microcomputers

10, 20, and 30 will be described.

First, an operation in which the current information processing unit 308 accumulates A / D conversion data d1 in order to display current information such as a current waveform on the display unit 8 will be described.
As shown in FIG. 13, A / D conversion data d1 output from the A / D conversion circuit 104 is input to the tag data adding unit 108d. The tag data adding unit 108d adds tag data T1 to the received A / D conversion data d1, and generates a tagged digital signal E1 shown in FIG.
The tag data T1 is an integer with an initial value of 0, and is incremented by one each time the tag data adding unit 108d acquires the A / D conversion data d1 from the A / D conversion circuit 104.
The tagged digital signal E1 is output from the tag data adding unit 108d to the instantaneous trip processing unit 108a, the maximum value calculation unit 108b, the effective value calculation unit 108c, and the second communication circuit 107.

The second communication circuit 107 that has received the tagged digital signal E1 transmits the tagged digital signal E1 to the current information processing unit 308 via the first communication circuit 304 of the third microcomputer 30.
As shown in FIG. 15, the current information processing unit 308 divides the received digital signal with tag E1 into A / D conversion data d1 and tag data T1 and stores them in the FIFO table.

In the FIFO table of the current information processing unit 308, when the FIFO table shown in FIG. 15A is full and a digital value (n + 1) that is new data is written, as shown in FIG. The digital value 1 which is the oldest data and its tag data are updated so as to be deleted from the FIFO table. For this reason, the FIFO table stores digital values of old load currents up to a predetermined number before the latest digital value of load current. The FIFO table is configured in the ROM 302 or the RAM 303.

Next, the instantaneous trip operation will be described.
Upon receiving the tagged digital signal E1 from the tag data adding unit 108d, the instantaneous trip processing unit 108a instantaneously sends the tagged digital signal E1 from the output port 106 to the trip circuit 6 when the current range of the instantaneous trip characteristic is exceeded. tripping outputs a signal S1, transmits the time tag data that has been granted to the tagged digital signal E1 as a form of INST tag data T _I shown in FIG. 16, from the first communication circuit 105 to the second microcomputer 20 To do.

INST tag data _{T I} receive current information processing unit 308 stops updating the FIFO table collates the INST tag data _{T I} and the received tag data stored in the FIFO table, a matching tag data previously The corresponding A / D conversion data is transmitted to the display unit 8 via the display output unit 307, and the current waveform in the electric circuit 1 from the predetermined time before the tripping device 7 opens the switching contact 2 is displayed. This is displayed on part 8.
Similarly, the current information processing unit 308 is connected to an external communication terminal from the external output unit 306 in the electric circuit 1 until the tripping device 7 opens the switching contact 2 by a wireless communication or the like until a predetermined time before it opens. Send current waveform data.

Next, the short time trip operation will be described.
The maximum value calculation unit 108b checks the A / D conversion data d1 of the tagged digital signal E1 received from the tag data adding unit 108d, and four times the first predetermined cycle (for example, 10 msec which is a half cycle of 50 Hz). The maximum value data d2 at 40 msec) is calculated. The last tag data T1 in the period is added to the maximum value data d2, and the tagged maximum value data E2 shown in FIG. 17 is generated and transmitted from the first communication circuit 105 to the second microcomputer 20.

When the short time delay trip processing unit 208b of the second microcomputer 20 receives the maximum value data E2 from the maximum value calculation unit 108b via the first communication circuit 205, the short time delay trip processing unit 208b sets the short time delay trip set by the setting processing unit 208a. Compared with the characteristic data, if it is an overcurrent, after a time limit operation is performed, a time limit trip signal S2 is output to the trip circuit 6 via the output port 206, and a time limit trip signal S2 is output. extracts tag data led to the tagged maximum data E2, and transmits to the third microcomputer 30 via the second communication circuit 209 as a SHORT tag data T _S shown in FIG. 18.

The second communication circuit 305 that has received the SHORT tag data T _S from the second microcomputer 20 passes the SHORT tag data T _S to the current information processing unit 308, so that the second microcomputer 20 performs short-time tripping. And tag data when the short-time trip is executed.

SHORT tag data _{T S} receives current information processing unit 308 stops updating the FIFO table collates the SHORT tag data _{T S} and the received tag data stored in the FIFO table, a matching tag data previously The corresponding A / D conversion data is transmitted to the display unit 8 via the display output unit 307, and the current waveform in the electric circuit 1 from the predetermined time before the tripping device 7 opens the switching contact 2 is displayed. This is displayed on part 8.
Similarly, the current information processing unit 308 is connected to an external communication terminal from the external output unit 306 in the electric circuit 1 until the tripping device 7 opens the switching contact 2 by a wireless communication or the like until a predetermined time before it opens. Send current waveform data.

Next, the long time delay trip operation will be described.
The effective value calculation unit 108c that has received the tagged digital signal E1 from the tag data adding unit 108d receives a second predetermined period (for example, a period of 50 Hz) from the digital signal of the tagged digital signal E1 received from the tag data adding unit 108d. At the end of the period used for the calculation, that is, the tag data of the latest tagged digital signal E1 is added to the effective value calculated by the calculation. 19 is transmitted from the first communication circuit 105 to the second microcomputer 20 as tagged effective value data E3.

When the long time delay trip unit 208c of the second microcomputer 20 receives the tagged effective value data E3 from the effective value calculator 108c via the first communication circuit 205, the long time delay set by the setting processor 208a is received. In the case of an overcurrent, the time limit operation is performed in the case of an overcurrent, and then the time limit trip signal S2 is output to the trip circuit 6 via the output port 206 and the time limit trip signal S2 is output. Tag data is extracted from the tagged effective value data E3 to be output, and transmitted to the third microcomputer 30 via the second communication circuit 209 as LONG tag data _TL shown in FIG.

The second communication circuit 305 that has received the LONG tag data _TL from the second microcomputer 20 passes the LONG tag data _TL to the current information processing unit 308, so that the second microcomputer 20 performs the long time delay trip. And tag data when the long time delay trip is executed.

The current information processing unit 308 that has received the LONG tag data _TL stops updating the FIFO table, collates the tag data stored in the FIFO table with the received LONG tag data _TL, and before the matching tag data The corresponding A / D conversion data is transmitted to the display unit 8 via the display output unit 307, and the current waveform in the electric circuit 1 from the predetermined time before the tripping device 7 opens the switching contact 2 is displayed. This is displayed on part 8. Similarly, the current information processing unit 308 is connected to an external communication terminal from the external output unit 306 in the electric circuit 1 until the tripping device 7 opens the switching contact 2 by a wireless communication or the like until a predetermined time before it opens. Current waveform data can also be transmitted.

When the instantaneous trip signal S1 or the timed trip signal S2 is output from either the first microcomputer 10 or the second microcomputer 20, the trip circuit 7 is driven to excite the trip device 7, and the switching contact 2 is opened.
In addition, the “tagged current signal data” described in the claims means the tagged digital signal E1, the tagged maximum value data E2, and the tagged effective value data E3.

According to the electronic circuit breaker of the present embodiment, the current signal of the current detection device 3 is input, the first microcomputer 10 that outputs the instantaneous trip signal and the setting unit 5 are connected, and the instantaneous trip characteristic is obtained. Based on the second microcomputer 20 that transmits to the first microcomputer 10 and obtains current information flowing through the electric circuit 1 from the first microcomputer 10 and outputs a time-delay trip signal, and the instantaneous trip signal S1 and the time-delay trip signal S2. A tripping device 7 for opening the switching contact 2 and a third microcomputer 30 having a current information processing unit 308 that obtains current information of the electric circuit 1 from the first microcomputer 10 and displays or outputs the current information to the outside. Since it is provided, the processing load on each microcomputer is reduced, and the processing time can be shortened and the internal memory usage capacity can be reduced.

Further, the current information displayed or output to the outside by the current information processing unit 308 is a current waveform in the electric circuit 1 or a harmonic current of the electric circuit 1 from immediately before the tripping device 7 opens the switching contact 2 to the opening. The cause of the interruption by the electronic circuit breaker 600 can be easily grasped.

The first microcomputer 10 generates current signal data in which tag information indicating detection timing is added to the current signal from the current detection device 3, and the current information processing unit 308 and the second microcomputer of the third microcomputer 30. The second microcomputer 20 transmits the tag information to the current information processing unit 308 when the time-counting trip signal is output, and trips based on the tag information. Since the current waveform in the electric circuit 1 from when the device 7 opens the switching contact 2 until a predetermined time is opened or output to the outside, the trip signal is sent from the first microcomputer 10 and the second microcomputer 20 to the third microcomputer 30. The number of ports used can be reduced without the need for separate input.

Further, since the third microcomputer 30 displays or outputs the current waveform in the electric circuit 1 from the predetermined time before the tripping device 7 opens the switching contact 2 to the outside based on the tag information, it outputs it to the outside. It is not necessary to synchronize the communication between the second microcomputer 20 and the third microcomputer 30 and the communication between the second microcomputer 20 and the third microcomputer 30, and an efficient data size and communication cycle can be adopted for each communication. The reliability of the entire circuit breaker can be improved.

2 switching contacts, 3 current detection device, 4 current detection circuit, 5 setting section,
6 Trip circuit, 7 Trip device, 8 Display,
10 first microcomputer, 20 second microcomputer,
30 Third microcomputer,
104 A / D conversion circuit, 105 first communication circuit, 106 output port,
107 second communication circuit, 108 software processing,
108a Instantaneous trip processing unit, 108b Maximum value calculation unit, 108c RMS value calculation unit,
204 setting input unit, 205 first communication circuit, 206 output port,
208 software processing, 208a setting processing unit, 208b short time delay trip processing unit,
208c long time delay trip processing unit, 209 second communication circuit,
304 first communication circuit, 305 second communication circuit, 306 external output unit,
307 display output unit, 308 current information processing unit,
400 Electronic circuit breaker.

Claims

An open / close contact that opens and closes the electrical circuit;
A current detection device for detecting a current in the electric circuit;
A setting unit for setting an instantaneous trip characteristic for opening the switching contact, a short time trip characteristic, and a long time trip characteristic according to the current flowing through the electric circuit;
A first microcomputer that receives an output signal of the current detection device and outputs an instantaneous trip signal;
The setting unit is connected to transmit the instantaneous trip characteristic to the first microcomputer, acquire current information flowing through the electric circuit from the first microcomputer, and output a time-delay trip signal. A microcomputer,
A tripping device that opens the switching contact based on the instantaneous trip signal and the timed trip signal;
A current information processing unit for acquiring current information of the electric circuit from the first microcomputer and displaying or outputting the current information to the outside;
An electronic circuit breaker comprising:
The electronic circuit breaker according to claim 1, wherein the current information processing unit is provided in the second microcomputer.
2. The electronic circuit breaker according to claim 1, wherein the current information processing unit is provided in a third microcomputer different from the first microcomputer and the second microcomputer.
The first microcomputer generates tagged current signal data obtained by adding tag data indicating detection timing to the current signal from the current detection device, and sends the tag to the current information processing unit and the second microcomputer. A tag data adding unit for transmitting attached current signal data,
The second microcomputer transmits the tag data to the current information processing unit when outputting the time-delay trip signal,
4. The electronic system according to claim 3, wherein a current waveform in the electric circuit is displayed or outputted to the outside from a predetermined time before the tripping device opens the switching contact based on the tag data. Circuit breaker.
The current information is the current waveform in the electric circuit or the harmonic current of the electric circuit from immediately before the tripping device opens the switching contact until the opening is opened. The electronic circuit breaker of any one of Claims.
The first microcomputer includes an instantaneous trip unit that outputs the instantaneous trip signal, and a short time trip unit and a long time trip unit that output the time trip signal to the second microcomputer. The electronic circuit breaker according to claim 1, further comprising an electronic circuit breaker.