JP2002008510A - Wiring breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a breaker for wiring that can transmit the standard value which is established to be a standard of tripping, even at the open time of the opening and shutting contact, and that is easy to centrally control from outside. SOLUTION: The breaker for wiring 100 comprises a property setting section 128 for establishing the tripping standard value of the trip coil 136, a current detector 104a, 104b, 104c for detecting the electric current flowing in the respective phase cable way 102a, 102b, 102c, a trip operation section 112 which outputs the tripping signal to the trigger circuit 134 when the input current value has exceeded the standard value stored in the memory section 118, and a power source circuit 132 which supplies the driving power to the trip operation section 112 from the respective phase cable way 102a, 102b, 102c, and also comprises a communication operation section 212 which has a switch 232 for supplying the driving current from a power source circuit 220 to the power source circuit 132 when the switch contact 138a, 138b, 138c are open and obtains the standard value from the trip operation section 112 by communication and transmits the standard value to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker for opening and closing a switching contact by a tripping section in accordance with a current flowing through each phase circuit. The present invention relates to a circuit breaker for transmitting to a wiring breaker.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional circuit breaker with a measuring function described in, for example, JP-A-11-8930. In FIG. 5, 1 is a circuit breaker main body, 2 is an electric circuit in the circuit breaker main body 1, 3 is a switching contact for opening and closing the electric current of the electric circuit 2, 4 is a current transformer detecting the electric current of the electric circuit 2, and 5 is a transformer. The rectifier circuit 6 rectifies the current of the current transformer 4.
A peak value conversion circuit for detecting an instantaneous maximum value of the current flowing through the circuit and outputting the detected value; a signal 7 when an input from the peak value conversion circuit 6 exceeds an instantaneous reference value (predetermined instantaneous peak current value) Instantaneous circuit for outputting, 8 is peak value conversion circuit 6
A short time limit circuit for outputting a signal when the input from the input terminal exceeds a short time limit reference value (a predetermined current value and a predetermined short time limit). A / D conversion of the output of the rectifier circuit 5 and a current flowing through the electric circuit 2 are performed. An effective value conversion circuit 10 for converting to an effective value of the current outputs a signal when an input from the effective value conversion circuit 9 exceeds a reference value for a long time limit (an effective value of a predetermined current and a long time limit for an inverse time function). A long time limit circuit 11 is a trigger circuit, which receives a signal output from the instantaneous circuit circuit 7, short time limit circuit 8, and long time limit circuit 10 and opens the switching contact 3 via the electromagnetic coil 12.
The reference values of the short time limit circuit 8 and the long time limit circuit 10 serving as the reference for tripping the switching contact 3 can be changed from outside the circuit breaker main body 1.

[0003] 20 energization information measuring unit, 21 is the electric circuit 2
, A transformer for detecting a voltage between the electric circuits 2 (inter-phase voltage), a current A / D conversion circuit for A / D converting an output from the current transformer, and a current transformer for detecting Transformer 2
A / D conversion circuit for A / D converting the output from
Reference numeral 5 denotes a current current output I of each electric circuit 2, 26 denotes a maximum current storage circuit for storing the maximum current value Imax of the electric circuit 2,
Reference numeral 7 denotes a current inter-phase voltage V of each electric circuit 2; 28, a multiplication circuit for multiplying the current I by the inter-phase voltage V to obtain a load power W; 29, an integration circuit for integrating outputs of the multiplication circuits to obtain a power amount kWh. . The outputs of the current current value I, the maximum current value Imax, the inter-phase voltage V, the power W, and the power amount kWh are displayed on the display unit 29 via the display content selection means 30. Reference numeral 33 denotes a pre-alarm detection circuit which sends an output to the pre-alarm output circuit 34 at a current value slightly lower than the rated current,
5 is lit to indicate that the load current is approaching the breaking operation of the circuit breaker. Reference numeral 36 denotes a power supply for transforming a drive power supply for the microprocessor (not shown) and a pre-alarm output circuit 34 from the external power supply 37 for executing (not shown) the maximum current storage circuit 26, the multiplication circuit 28, the accumulation circuit 29, the display content selection means 30, and the like. Circuit.

[0004]

The conventional circuit breaker with a measuring function configured as described above can display the electric quantity of the electric circuit 2 on the display unit 31 and has an external output terminal (not shown). Then, these electric quantities can be output. However, the reference values of the short time limit circuit 8 and the long time limit circuit 10 serving as a reference for tripping the on / off contact 3 cannot be transmitted to the outside. It is necessary to go to the installation location, and furthermore, this confirmation work is required every time the set value is changed, and it has been difficult to centrally manage the circuit breaker main body 1 from outside for protection coordination and the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and a wiring breaker which can easily be centrally controlled from the outside by transmitting a set reference value serving as a reference for tripping. The purpose is to provide. It is another object of the present invention to provide a circuit breaker for wiring that does not affect the tripping operation when the set reference value is transmitted and that has high tripping reliability. It is another object of the present invention to provide a circuit breaker that can transmit a set reference value even when the tripping operation unit is not activated and can easily perform centralized management from the outside.

[0006]

According to the present invention, there is provided a circuit breaker for wiring which sets a switching contact for opening each phase electric circuit by the operation of a tripping section and a reference value which is a reference for tripping by the tripping section. A reference value setting unit, a storage unit that stores the reference value set by the reference value setting unit, a current detector that detects a current flowing through each phase circuit, an input from the current detector, and the storage. A trip calculation unit that outputs a trip signal to the trip unit based on the reference value stored in the trip unit, and a trip that supplies drive power to the trip calculation unit and the storage unit from each of the phase electric circuits. In the circuit breaker for wiring provided with a disconnection power supply circuit, the reference value is input, and the trip calculation unit and the communication calculation unit that are separate from each other and transmit the reference value to an external device; Continuously regardless of the state of each phase circuit The dynamic power is obtained and a communication power supply circuit for supplying.

[0007] When receiving a reference value transmission request from the communication operation unit, the tripping operation unit returns the reference value stored in the storage unit and sets the priority of the tripping operation process over this communication process. Is configured to be high.

Further, the communication power supply circuit is configured to be able to supply drive power to a circuit supplied by the tripping power supply circuit when the tripping power supply circuit cannot supply driving power. Furthermore, in the case where the communication power supply circuit supplies power to the tripping power supply circuit, when there is no response from the tripping operation unit after a predetermined time elapses from the time when the communication operation unit requests transmission, The communication operation unit is configured to output error information.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1 of the present invention will be described below. FIG. 1 is a block diagram illustrating a configuration of a circuit breaker according to Embodiment 1 of the present invention. FIG. 2 is an explanatory diagram of a table code switch constituting the characteristic setting unit. In FIG. 1, 100 is a circuit breaker, 102a, 102b, 10
2c is an electric circuit provided in the circuit breaker 100, 104
a, 104b, and 104c are the respective phase electric circuits 102a, 102
b, 102c are current detectors for detecting currents, for example, air-core coils. 106 is a current detector 102a, 1
02b and 102c are integrated and amplified, a signal corresponding to each phase current is output to the phase selection sampling circuit 108, and a maximum instantaneous value of signals corresponding to each phase current is output to the instantaneous circuit 110. I do. 108 is a phase selection sampling circuit for detecting and outputting the maximum phase from a signal corresponding to each phase current, and 110 is an instantaneous circuit. The maximum instantaneous value of each phase is used as a reference for the instantaneous trip set by the characteristic setting unit 126. When the current value exceeds a predetermined current value, the output signal S110 is inverted from the L (low) voltage to the H (high) voltage. The trigger circuit 134 trips the trip coil 136 when receiving the inversion of the output signal S110. Here, the reference value serving as the reference for tripping is a value defined by the current or the current (including the function of the current) and the duration thereof. In the case of the first embodiment, the instantaneous circuit 110 described above is used. A predetermined current value, a value defined by an inverse time limit function of a long time limit unit 124 described later, and a short time limit unit 12 described later.
2 is a value defined by a predetermined current value and a predetermined duration. The predetermined current value of the instantaneous circuit 110 is larger than the predetermined current value of the short time limit section 112.

Reference numeral 112 denotes, for example, a microcomputer (microcompute).
r), the trip operation unit 114 converts the signal from the phase selection sampling circuit 108 into an A / D (analog / d
A / D converter 116 for performing digital (A / D) conversion is an operation unit, and output data of the A / D converter 114 and a storage unit 118
Based on the reference value of the trip stored in the storage unit, the trip calculation and the advance warning, the calculation for communication with the measurement calculation unit 212 described later, and the like are performed. 118 is a RAM (Random Acc
ess Memory), a short time limit set by the characteristic setting unit (reference value setting unit) 128,
The set values of the long time limit and the advance warning are stored. Reference numeral 120 denotes an input / output unit that communicates with the measurement calculation unit 212 based on a command from the calculation unit 116.

Reference numeral 124 denotes a long time limit unit, and the A / D conversion unit 1
When the output data of the port 14 exceeds the reference value for tripping in the long time limit stored in the storage unit 118, the output signal S124 from a port (not shown) is changed from the L (low) voltage to the H (hig
h) Invert to voltage. Here, the reference value for tripping in the long time limit is an inverse time function between the current and the current flowing time, and is, for example, the effective value of the current flowing in an overload region where a current slightly larger than the rated current flows. Has an anti-time limit characteristic. 122 is a short time limit, and A
When the output data of the / D conversion unit 114 exceeds the reference value of the short time trip stored in the storage unit 118, the output signal S122 from a port (not shown) is changed from the L (low) voltage to the H level.
(High) voltage. Here, the reference value of the short time limit trip is a function of the conduction current and the conduction time, and for example, when a fault current flows, a large current can be obtained without waiting for the trip by the reverse time limit characteristic of the long time limit section 124. It responds in a short time. In the first embodiment, the short time limit 1
Although the description has been given of the circuit breaker having the 12, the circuit breaker without the short time limit section 112 may be used. The trigger circuit 134 trips the trip coil 136 when receiving the inversion of the output signals S122 and S124. Reference numeral 126 denotes a pre-warning unit that, when the output data of the A / D conversion unit 114 exceeds the pre-warning reference value stored in the storage unit 118, changes the output signal S126 from a port (not shown) from the L (low) voltage. H
(High) voltage. Here, the reference value of the advance warning is a value slightly smaller than the rated current value.

128 is an instantaneous circuit 110, a short time limit section 12
2. A characteristic setting unit (reference value setting unit) for setting a reference value to the long time limit unit 124 and the advance warning unit 126, and is configured by, for example, a table code switch as shown in FIG. Referring to FIG. 2, 128A is a part of the characteristic setting unit 128, for example, a table code switch for setting a short time trip reference value, one end of which is connected to the power terminal of the power circuit 132, and the contacts a, b, and c. , D are closed, an H signal is output to the tripping operation unit 112, and when they are open, an L signal is output to the tripping operation unit 112. The trip calculation unit 112 identifies a reference value set by a combination of the H signal and the L signal from the contacts a, b, c, and d.
Contacts a, b, c, d of table code switch 128A
Can be turned on / off by a driver or the like from outside the circuit breaker 1 for wiring. Returning to FIG.
a, 130b, and 130c are electric circuits 102a, 102b, and 1
02c, a current detector for operating the power supply circuit 132, 132 is a power supply circuit (tripping power supply circuit),
A signal input circuit 106, a phase selection sampling circuit 108,
Instantaneous circuit 110 trip operation unit 112, characteristic setting unit 12
8. The drive power is supplied to the trigger circuit 134 and the trip coil 136. 134 is an output signal S110, S12
2. When S124 is inverted to the H signal, a trigger circuit that outputs a trigger signal to the trip coil 136, and the opening / closing contact 138 according to the trigger signal of the trigger circuit 134
a, 138b, and 138c are trip coils that open. A trip portion is configured by the trigger circuit 134 and the trip coil 136.

Reference numeral 200 denotes a measuring unit constituted by, for example, a microcomputer, which is housed in the housing of the circuit breaker 100 for wiring. 202a, 202b are the electric circuits 102a, 1
Voltage detectors (transformers) 204 for detecting voltages between the electric circuits 02b and 102c are voltage detectors 202a and 202b.
Is a voltage signal input circuit for converting the output to a level that can be easily processed by an electronic circuit, and outputting the converted signal.
A / D conversion unit for A / D converting the output of the current detector 208, a current signal input circuit for converting the output of the current detectors 104a, 104b, 104c to a level that can be easily processed by an electronic circuit and outputting the output, and 210 a current signal input circuit An A / D conversion unit for A / D converting the output of the A / D converter 208.

Reference numeral 212 denotes a measurement calculation unit (communication calculation unit) which calculates currents, voltages, power amounts, and the like flowing through the electric circuits 102a, 102b, 102c based on inputs from the A / D conversion units 206, 210, and displays them. 218, the trip information is transmitted from the data output unit 216 when the port output signals S110, S122, S124, and S126 are inverted to the H level, and is stored in the storage unit 118 by communication via the communication line 140. The reference value for the trip. 21
Reference numeral 4 denotes a storage unit that stores the trip reference value received by the measurement calculation unit 212. Reference numeral 220 denotes a power supply circuit (communication power supply circuit), which converts the commercial AC power supply 222 into a direct current, and
The drive power supply is continuously supplied to the voltage signal input circuit, the current signal input circuit, and the A / D converter 2 regardless of the states of 102b and 102c.
06, 210, the measurement calculation unit 212, the storage unit 214, the data output unit 216, and the display 218.

Next, the operation, in particular, the operation of transmitting the reference value will be described. (Trip operation section) After the circuit breaker 100 for wiring is installed on a predetermined electric circuit, each reference value is set by the characteristic setting section 128 as described above, the power supply circuit 220 is connected to the commercial AC power supply 222, and Switching contacts 138a, 13 of breaker 100
8b and 138c are closed. When the drive power is supplied from the power supply opening 132, the trip calculation unit 112 inputs the reference value (the instantaneous circuit 110, the short time limit, the long time limit, and the reference value of the advance warning) set by the characteristic setting unit 128, and stores the reference value. Part 11
8 (step 01). The arithmetic unit 116 stores the trip reference value stored in the storage unit 118 and the A / D converter 11
4 is compared with the input data, and the trip operation is performed (s
step02), when the input data exceeds the reference value, the output signal S122 from the short time limit unit 122 and the long time limit unit 124, respectively.
S124 is inverted to H level (step 03). Similarly, the operation unit 116 compares the pre-warning reference value stored in the storage unit 118 with the data input from the A / D conversion unit 114, performs a pre-warning calculation (step 04), and outputs the output signal by the pre-warning unit 126. Invert to H level (ste
p05).

The trip calculation unit 112 sends a reference value transmission request S21 from the measurement calculation unit 212 via the input / output unit 120.
When receiving 2, the calculation unit 116 transmits a response S122 including the reference value stored in the storage unit 118 from the input / output unit 120 to the measurement calculation unit 212 (step 06). When the reference value is changed by the characteristic setting unit 128, the calculation unit 116 detects the change in the reference value, stores the changed reference value in the storage unit 118, and then stores the changed reference value in the measurement calculation unit. It is transmitted to 212 (step 07). Note that st
The trip operation of ep02 is performed in step 06 and step
Since the priority is set higher than the calculation related to the transmission in 07, that is, the transmission is performed during the trip calculation, the reliability of the trip can be maintained as in the related art.

(Measurement calculation unit) The measurement calculation unit 212 associates the correspondence of the instantaneous open circuit 110, the short time limit circuit 122, the long time limit circuit 124, and the accident alarm unit 126 in advance for each port (not shown). As a result, the output signal S11
When 0, S122, S124, and S126 are inverted to the H level, it is possible to detect which of the circuits 110, 122, 124, and 126 has been inverted, and corresponding display and data output can be performed. For example, when the output signal S124 from the short time limit unit 122 is inverted, the display unit 218 displays "during short time trip", and the short time trip is notified to the centralized terminal higher than the data output unit 216 together with the time. Send.

The measurement calculation unit 212 performs step 0 described above.
When the information including the reference value stored in the storage unit 116 is received by step 6 and step 07, the reference value is stored in the storage unit 2
14 (step 20). Measurement calculation unit 212
Returns a signal including the reference value stored in the storage unit 214 to the higher concentration terminal when there is a transmission request of the reference value from the higher concentration terminal (step 21). , Electric circuits 102a, 102b,
Information such as a current, a voltage, and an amount of electric power flowing through the storage device 102c is stored in the storage unit 214 together with the time (step 23).
p24), a signal including the measured value stored in the storage unit 214 is returned to the upper concentration terminal (step 25).

As described above, the circuit breaker 100 for wiring can easily perform centralized control of protection coordination and the like from the outside by transmitting the set reference value serving as the reference for tripping. In addition, since the measurement calculation unit 212 is provided separately from the trip calculation unit 112, the transmission calculation does not affect the trip calculation when the set reference value is transmitted.
High reliability of tripping. In addition, since the measurement calculation unit 212 is continuously supplied with the driving power by the power supply circuit 220 regardless of the state of the electric circuits 102a, 102b, and 102c, the reference set even when the trip calculation unit 112 is not activated. The values can be read out from the storage unit 214 and transmitted, so that centralized management from outside can be easily performed. Also, the storage unit 1
Since the reference value set to 16 is transmitted by communication via the communication line 140, the measurement calculation unit 212
8 (for example, a 4-bit table code switch as shown in FIG. 2 is connected to the instantaneous circuit 110, the short time limit circuit 122, and the long time limit circuit 12).
4. When used for the advance warning unit 126, 16 wires are required), the circuit breaker 100 and the measuring unit 200
Can be simplified, and the circuit breaker 100 can be downsized.

Second Embodiment A second embodiment of the present invention will be described below. FIG. 3 is a block diagram illustrating a configuration of a circuit breaker according to Embodiment 2 of the present invention. FIG. 4 is a flowchart illustrating the operation of the measurement calculation unit according to Embodiment 2 of the present invention. In FIG. 3, reference numeral 150 denotes a power supply line,
When the power supply circuit 132 cannot supply drive power to the tripping operation unit 112 and the like due to a small current flowing through 2a, 102b, and 102c, drive power is supplied from the power supply circuit 220 to the power supply circuit 132. Reference numeral 230 denotes a switch circuit that controls opening and closing of the switch 232 in response to a command from the measurement calculation unit 212. Reference numeral 232 denotes a switch, for example, a semiconductor switching element having a gate terminal connected to the output terminal of the switch circuit 230. The other configuration is the same as that of the first embodiment, and a description thereof will be omitted.

The measurement calculation unit 212 is a trip calculation unit 112
The operation of receiving the reference value set from the above will be described with reference to FIG. The measurement calculation unit 212 sets n = 0 as an initial value of a program related to transmission and reception of the reference value (step 30). At the predetermined timing (for example, once a day) stored in the measurement calculation unit 212, the trip calculation unit 1
Then, a transmission request S212 of the reference value set to the reference number 12 is transmitted (step 31). After the transmission of the transmission request S212, the measurement calculation unit 212 responds to the transmission request S212 from the tripping calculation unit 112 within a predetermined time.
It is checked whether or not 2 is present (step 32). s
When the response S112 is detected by the step 32, the response S112 is received, and the reference value set in the message is stored in the storage unit 214 (step 33).

On the other hand, when the response S112 is not detected in step 32, the open / close contacts 138a, 138b,
138c is open circuit or electric circuit 102a, 102b, 102
The drive current cannot be supplied from the power supply open circuit 132 due to the small current flowing through the switch c, or some abnormality such as a failure of the tripping operation unit 112 has occurred. At this time, the value of n is increased by 1 (step 33), and a switch ON command is output to the switch circuit 230 (step 33).
34). When receiving the switch ON command, the switch circuit 230 turns on the switch 232. When the switch 232 is turned on, the power supply circuit 220
32 is supplied with drive power. Next, the measurement operation unit 21
2 detects whether n = 2 (step 36),
When n = 2, it is determined that some abnormality such as a failure of the tripping operation unit 112 has occurred, and error information is transmitted from the error display and data output unit to a centralized terminal and the switch 232 is turned off. The command is output to the switch circuit 230 (step 37). On the other hand, st
When n = 2 is not satisfied by ep36 (that is, when n = 1), steps 31 and 32 are repeated.

After storing the reference value set in step 33, it is detected whether or not n = 0 (step 3).
8) If n = 0, return to step 31 and wait for a transmission request. On the other hand, when n = 0 by step 38, a command to turn off the switch 232 is issued to the switch circuit 230.
(Step 39), and initializes n to 0 (step 39).
p40), returning to step 31 to wait for a transmission request.

With the above configuration, the switching contact 13
8a, 138b, and 138c are open circuits or electric circuits 102a,
The current flowing through 102b and 102c is small,
Even when the drive power cannot be supplied, the measurement calculation unit 212 can read the set reference value stored in the storage unit 118. Further, when the drive power is not supplied from the power supply open circuit 132, the drive power is supplied from the power supply circuit 220 to the power supply circuit 132 only when the reference value stored in the storage unit 118 is read.
As compared with the case where the drive power is supplied from the power supply circuit 20 to the power supply circuit 132, the problem of heat generation from the power supply circuit 220 is reduced, and the power supply circuit 220 can be downsized. Can be reduced in size.
That is, it is possible to use a circuit equivalent to the above-described power supply circuit 220 (for example, a power supply IC such as a three-terminal regulator) and to always supply driving power to the tripping operation unit 112. It is necessary to use the circuit at a high derating rate, and since the operating temperature when the wiring breaker 110 is energized and the heat-resistant temperature of the electronic components constituting the power supply circuit 220 and the like are close to each other, the heat generated from this power supply circuit is also ignored. become unable. On the other hand, in order to solve the problem due to heat generation, it is conceivable to employ a power supply circuit that constantly supplies drive power from the power supply circuit 220 with a high rating. Becomes large, which hinders downsizing of the circuit breaker 110 for wiring. In addition, the measurement calculation unit 212 includes the trip calculation unit 1
The presence or absence of the response S112 within a predetermined time from the time 12 makes it possible to detect an abnormality in the tripping operation unit 112, and by transmitting this information to the higher-level terminal via the data output unit 216, An abnormality of the circuit breaker 100 can be known on the terminal side.

[0025]

According to the present invention, there is provided a circuit breaker for wiring according to the present invention, wherein an opening / closing contact for opening each phase electric circuit by operation of a tripping section, and a reference value setting for setting a reference value as a reference for tripping by the tripping section. Unit, a storage unit that stores the reference value set by the reference value setting unit, a current detector that detects a current flowing through each of the phase circuits, an input from the current detector, and the storage unit that is stored in the storage unit. A trip calculation unit that outputs a trip signal to the trip unit based on the reference value, and a trip power supply circuit that supplies driving power to the trip calculation unit and the storage unit from each of the phase electrical circuits. In the circuit breaker provided with the above, the reference value is input, the trip calculation unit and the separate communication calculation unit for transmitting the reference value to an external device, and the communication calculation unit includes Drive power is supplied continuously regardless of the state Since a communication power supply circuit that,
By transmitting the set reference value serving as the tripping reference, centralized management from the outside can be easily performed.

When receiving a reference value transmission request from the communication operation unit, the tripping operation unit returns the reference value stored in the storage unit and sets the priority of the tripping operation process over this communication process. Is configured to be high, the tripping operation is not affected when the set reference value is transmitted, and the tripping reliability is high.

Further, the communication power supply circuit is configured to be able to supply drive power to the circuit supplied by the tripping power supply circuit when the tripping power supply circuit cannot supply driving power. The reference value that has been set can be transmitted even when it is not performed, and centralized management from outside can be easily performed.

Further, when the communication power supply circuit supplies power to the tripping power supply circuit, a response from the tripping calculation unit is not sent until a predetermined time elapses from the time when the communication operation unit requests transmission. When not present, the communication operation unit is configured to output error information, so that an abnormality of the circuit breaker for wiring can be detected.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a circuit breaker according to Embodiment 1 of the present invention.

FIG. 2 is an explanatory diagram of a table code switch included in a characteristic setting unit in FIG. 1;

FIG. 3 is a block diagram illustrating a configuration of a circuit breaker according to Embodiment 2 of the present invention.

FIG. 4 is a flowchart illustrating an operation of a measurement calculation unit according to Embodiment 2 of the present invention.

FIG. 5 shows a conventional circuit breaker with a measuring function.

[Explanation of symbols]

100 breaker for wiring, 102a, 102b, 10
2c electric circuit, 104a, 104b, 104c current detector, 110 instantaneous circuit, 112 trip operation unit, 116 operation unit, 118 storage unit,
122 short time limit, 124 long time limit, 128
Characteristic setting section, 130a, 130b, 130c Current detector, 132 power supply circuit (tripping power supply circuit), 134 trigger circuit, 136 trip coil, 138a, 138b, 138c open / close contact,
140 communication line, 200 measuring unit, 202
a, 202b voltage detector, 212 measurement operation unit (communication operation unit), 214 storage unit, 220 power supply circuit (communication power supply circuit), 222 commercial AC power supply

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshihiko Matsubara 2-6-1, Otemachi, Chiyoda-ku, Tokyo Within Mitsubishi Electric Engineering Co., Ltd. (72) Fumio Ishizaka 3-6-Kominamicho, Fukuyama-shi, Hiroshima No. 10 F-term in BSC (reference) 5G004 AA02 AB01 BA03 BA04 CA02 DA01 DC14 5G030 XX18 YY13

Claims (4)

[Claims] An opening / closing contact for opening each phase electric circuit by the operation of a tripping section, a reference value setting section for setting a reference value serving as a reference for tripping by the tripping section, and setting by the reference value setting section. A storage unit for storing the reference values thus obtained, a current detector for detecting the current flowing through each of the phase circuits, and the pull-down based on the input from the current detector and the reference values stored in the storage unit. A tripping operation unit that outputs a tripping signal to a tripping unit, and a tripping power supply circuit that supplies driving power to the tripping operation unit and the storage unit from each of the phase circuits, Enter the reference value,
A communication operation unit that is separate from the trip operation unit that transmits the reference value to an external device, and a communication power supply circuit that continuously supplies drive power to the communication operation unit regardless of the state of each phase circuit. A circuit breaker for wiring, comprising: 2. A trip calculation unit, upon receiving a reference value transmission request from a communication calculation unit, returns the reference value stored in the storage unit and sets a priority of the trip calculation process over the communication process. 2. The circuit breaker for wiring according to claim 1, wherein the height is higher. 3. The communication power supply circuit according to claim 1, wherein when the tripping power supply circuit cannot supply driving power, the tripping power supply circuit can supply driving power to a circuit supplied by the tripping power supply circuit. 2. The circuit breaker according to 2. 4. When the communication power supply circuit supplies power to the tripping power supply circuit, no response is received from the tripping operation unit until a predetermined time elapses from the time when the communication operation unit requests transmission. 4. The communication operation unit according to claim 3, wherein the communication operation unit outputs error information.
The described circuit breaker for wiring.