JPH07296685A - Breaking device - Google Patents

Abstract

PURPOSE:To prevent a breaker from being brought into unnecessary tripping operation even when a trouble occurs to a voltage detecting relay and to improve reliability by a method wherein a disconnection monitoring circuit is provided with a resistor limited to a current value lower than the operation current of a tripping coil. CONSTITUTION:During ordinary operation, a monitoring current flows, in order, to a resistor 25 for limiting a current, a voltage detection relay 19, a contact 16a, and a tripping coil 15. Since the relay 19 maintains an exitation state, a delay relay contact 21 is not closed, whereby nothing is detected by a detecting circuit 23. Meanwhile, since, when the coil 15 is disconnected, a monitoring current can not flow, the relay 19 is brought into non-excitation, and the contact 21 is closed after a lapse of a specified time. Thereby, an AND circuit is formed togetherwith a previously closed contact 16b, the circuit 23 detects that the coil 15 is disconnected, and an output to detect the occurrence of disconnection is effected by a disconnection detecting circuit 28. In this case, a monitoring current flowing through the coil 15 is limited to a value lower than the operation current of the coil 15 by a resistor 25, whereby the breaker 24 is prevented from being brought into unnecessary trip operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker composed of a circuit breaker and the like, which is housed in a closed switchboard arranged in a power receiving and distribution facility, and is particularly provided for monitoring disconnection of a trip coil of the circuit breaker. This is to prevent malfunction of the trip coil due to short circuit of the voltage detection relay.

[0002]

2. Description of the Related Art FIG. 9 is a single line connection diagram showing the configuration of a general power receiving and distributing facility for a high-voltage customer. In the figure, 1 is a power receiving line, 2 is a feeder line, 3 and 4 are circuit breakers and current transformers inserted and connected to both lines 1 and 2, and 5 is a zero inserted and connected to each feeder line 2. Phase current transformer, 6
Is an overcurrent relay that detects overcurrent and short-circuit faults via each current transformer 4 (JIS device number 50/51
7 is an ammeter connected to the overcurrent relay 6, 8 is a ground fault direction relay (JIS device number 67) for detecting a ground fault through the zero-phase current transformer 5, Reference numeral 9 is a closed switchboard for accommodating the power receiving line 1 and the feeder line 2. A plurality of these closed switchboards 9 are juxtaposed and electrically connected to each other to form a power receiving and distributing facility 10.

FIG. 10 is a circuit diagram showing the construction of a disconnection monitoring unit for the closing and tripping coils in the conventional circuit breaker housed in the closed switchboard shown in FIG. In the figure, 6
a and 8a are trip contacts of the overcurrent relay 6 and the ground fault direction relay 8 shown in FIG. 9, 11a and 11b are control power supplies, and 1
Reference numeral 2 is a trip switch which is closed at the time of trip and is connected in parallel with both trip contacts 6a and 8a. Reference numeral 13 is a closing switch which is closed at the time of closing, and 14 is a drawer type circuit breaker.
It is connected to the control power supplies 11a and 11b via 4a to 14d.

Reference numeral 15 is a trip coil of the circuit breaker 14,
Reference numeral a is a first contact point that is closed when the circuit breaker 14 is closed, and is connected between the trip switch 12 and the trip coil 14. Reference numeral 17 is a closing coil of the circuit breaker, and reference numeral 18a is a third contact point that closes the circuit breaker 14 in a tripped state, and is connected between the closing switch 13 and the closing coil 17. 19
Is in parallel with the trip switch 12 and has a first contact 16a
And a first voltage detection relay connected in series with the trip coil 15, and 20 in parallel with the closing switch 13 and a third
It is a second voltage detection relay connected in series with the contact 18a and the closing coil 17.

Reference numeral 21 is a first delay relay contact which is closed after a certain time has passed since the first voltage detection relay 19 was de-energized, and the second contact 1 which operates in the same manner as the first contact 16a.
6b is connected in series. 22 is a second voltage detection relay 20 which is closed when a certain time elapses after the second voltage detection relay 20 is de-excited.
The delay relay contact is connected in series with the fourth contact 18b, which operates similarly to the third contact 18a. 23 is the first
When the delay relay 21 and the second contact 16b are closed, the trip coil 15 is disconnected, and when the second delay relay 22 and the fourth contact 18b are closed, the closing coil 17 is disconnected. It is a detection circuit that detects and outputs each of the above.

Next, the operation of the conventional breaker constructed as above will be described. First, in the case of the tripping operation, the first contact 16a with the circuit breaker 14 turned on.
Is closed, so close the trip switch 12 or
When any fault is detected by the current relay 6 or the ground fault direction relay 8 and the trip contacts 6a and 8a are closed, the trip coil 15 is excited and the breaker 14 is tripped.
On the other hand, in the case of the closing operation, since the third contact 18a is closed with the breaker 14 being tripped, the closing switch 1
When 3 is closed, the closing coil 17 is excited and the circuit breaker 14
Is thrown in.

The circuit breaker 14 that is turned on and off as described above is usually used for protecting an important electric circuit, and is responsible for preventing the spread of the accident by interrupting the circuit when the electric circuit has an accident. Therefore, if the trip coil 15 of the circuit breaker 14 is broken, the excessive current at the time of the accident cannot be cut off, the accident spreads to the upper system of the electric circuit, and the damage is enormous.

For this reason, since the trip coil 15 of the circuit breaker 14 must constantly monitor its soundness, the first voltage detection relay 19 is connected to the first contact 16a and the trip point as shown in the figure. When the breaker 14 is connected in series and the circuit breaker 14 is in the closed state, the monitoring current having a value smaller than the operating current of the trip coil 15 is continuously supplied through the first contact 16a to monitor the disconnection. .

That is, during normal operation, the monitoring current flows in the order of the first voltage detection relay 19, the first contact 16a and the trip coil 15, and the first delay relay contact 21 does not close. Is not detected either. On the other hand, when the trip coil 15 is broken, the monitoring current cannot flow and the first voltage detection relay 19 is de-energized. Then, the first delay relay contact 21 closes after a certain period of time elapses.
An AND circuit is formed together with b, whereby the detection circuit 2
3 detects and outputs the disconnection of the trip coil 15.

Also on the closing coil 17 side, the disconnection is monitored as in the case of the trip coil 15 side. That is, during normal operation, the monitoring current flows in the order of the second voltage detection relay 20, the third contact 18a, and the closing coil 17, and the second delay relay contact 22 does not close.
Nothing is detected by the detection circuit 23. On the other hand, when the closing coil 17 is broken, the monitoring current cannot flow and the second voltage detection relay 20 is de-energized. Then, the second delay relay contact 22 is closed after a certain period of time elapses, so that an AND circuit is formed together with the previously closed fourth contact 18b, whereby the detection circuit 23 causes the closing coil 17 to close.
Detects that the is disconnected and outputs.

The reason why the first delay relay contact 21 is closed after the first voltage detection relay 19 has been de-excited for a certain period of time is that the first delay relay contact 21 is used instead of the first delay relay contact 21. When an ordinary relay contact is used, the trip switch 12 or both trip contacts 6a and 8a are closed from the moment they are closed, and the circuit breaker 14 is completely tripped to open the first contact 16a. This is for the purpose of preventing the trip coil 15 of the circuit breaker 14 from being erroneously detected as if it were broken because an AND circuit is formed by the ordinary relay contact and the second contact 16b for msec. .

[0012]

In order to monitor the disconnection of the trip coil 15 of the circuit breaker 14 as described above, the conventional circuit breaker constantly monitors a minute monitoring current via the first voltage detection relay 19. Since the first voltage detection relay 19 deteriorates due to long-term use and causes a short-circuit failure, the first contact 1
If 6a is in a closed state, a current due to a short circuit will flow to the trip coil 15 and the trip coil 15 will be excited, causing the tripping operation of the circuit breaker 14 even though it is not necessary, causing an accident. There was a point.

The present invention has been made to solve the above problems, and even if the voltage detection relay deteriorates due to long-term use and causes a short-circuit failure, the circuit breaker causes an unnecessary trip operation. It is an object of the present invention to provide a shutoff device capable of improving reliability without the need.

[0014]

According to a first aspect of the present invention, there is provided a circuit breaker which has a trip switch which is closed when the circuit breaker housed in a closed switchboard is tripped, a first contact which is closed when the circuit breaker is closed, and The tripping control circuit in which the tripping coil of the circuit breaker is connected in series between the control power supplies, the voltage detection relay and the current limiting resistor that limits the current flowing through it to a value smaller than the operating current of the tripping coil A disconnection monitoring circuit that is connected in parallel with the first contact and the trip coil in series, and a delay relay contact and a circuit breaker that are closed after a certain time has elapsed since the voltage detection relay has been de-excited. And a disconnection detection circuit for detecting and outputting disconnection of the trip coil due to closing of the delay relay contact and the second contact by connecting the two contacts in series. Than it is.

The circuit breaker according to a second aspect of the present invention is a trip switch that closes when the circuit breaker housed in the closed switchboard is tripped, a first contact point that closes the circuit breaker in a closed state, and a circuit breaker trip. A trip control circuit in which a trip coil is connected in series between control power sources, a voltage detection relay, and a current limiting resistor that limits the current flowing through the trip coil to a value smaller than the operating current of the trip coil The disconnection monitoring circuit, which is connected in parallel with the contact and in series with the trip coil, and the delay relay contact, which closes after a certain period of time when the voltage detection relay has been de-excited, is connected and tripped because the delay relay contact closes. And a disconnection detection circuit that detects and outputs a disconnection of the coil.

Further, according to a third aspect of the present invention, in a circuit breaker, a trip switch that closes when tripping a circuit breaker housed in a closed switchboard, a first contact point that the circuit breaker closes in a closed state, and a circuit breaker trip. The tripping control circuit in which the tripping coil is connected in series between the control power supplies, the first voltage detection relay, and the first current limiting resistor that limits the current flowing through the tripping coil to a value smaller than the operating current of the tripping coil are pulled out. A first disconnection monitoring circuit connected in parallel with the release switch, a second voltage detection relay, and a second current limiting resistor for limiting the current flowing through the second voltage detection relay to a value smaller than the operating current of the trip coil are first. The second disconnection monitoring circuit connected in parallel with the contact of No. 2 and the first voltage detection relay are de-excited, and the delay relay contact and the second voltage detection relay are de-excited, which are closed after a certain time elapses. The closed relay contacts is that a disconnection detecting circuit for detecting and outputting a disconnection of the pull off the coil by closing the connection to delay relay contacts and relay contacts in series.

According to a fourth aspect of the present invention, there is provided a circuit breaker which has a trip switch which is closed when the circuit breaker accommodated in the closed switchboard is detachable, a first contact which is closed when the circuit breaker is closed, and The tripping control circuit in which the tripping coil of the circuit breaker is connected in series between the control power supplies, the voltage detection relay and the current limiting resistor that limits the current flowing through it to a value smaller than the operating current of the tripping coil A disconnection monitoring circuit that is connected in series with the trip coil in parallel with the circuit breaker inserted in the closed switchboard;
The delay relay contact that closes after a certain period of time with the voltage detection relay de-excited, the second contact that closes when the circuit breaker is closed, and the delay relay contact and second contact that close when the circuit breaker is inserted in the switchboard A disconnection detection circuit for detecting and outputting disconnection of the trip coil by connecting the connecting means in series, closing both the delay relay contact and the second contact and connecting the connecting means. is there.

According to a fifth aspect of the present invention, there is provided a circuit breaker which has a trip switch which is closed when the circuit breaker which is removably housed in a closed switchboard is tripped, a first contact which is closed when the circuit breaker is closed, and The tripping control circuit in which the tripping coil of the circuit breaker is connected in series between the control power supplies, the voltage detection relay and the current limiting resistor that limits the current flowing through it to a value smaller than the operating current of the tripping coil And a disconnection monitoring circuit that is connected in parallel with the first contact and in series with the trip coil in the state where the circuit breaker is inserted in the closed switchboard, and a delay relay that closes after the voltage detection relay is de-excited for a certain period of time. The connecting means connected to the delay relay contact with the contact and the circuit breaker inserted in the closed switchboard are connected in series and the delay relay contact is closed and the connecting means is connected. It is obtained by a disconnection detecting circuit for detecting and outputting a disconnection of the pull off the coil by the.

According to a sixth aspect of the present invention, there is provided a circuit breaker which has a trip switch which is closed when the circuit breaker accommodated in the closed switchboard is detachable, a first contact which is closed when the circuit breaker is closed, and The tripping control circuit in which the tripping coil of the breaker is connected in series between the control power supplies, the voltage detection relay, and the current limiting resistor that limits the current flowing through it to a value smaller than the operating current of the tripping coil And a disconnection monitoring circuit connected in parallel with the trip switch and the first contact and in series with the trip coil with the circuit breaker inserted in the closed switchboard, and the voltage detection relay arranged in the circuit breaker. The delay relay contact, which closes after a certain time after being de-excited, is connected with the circuit breaker inserted in the closed switchboard, and the delay relay contact closes, so the trip coil It is obtained by a disconnection detecting circuit for detecting and outputting a disconnection.

Further, according to a seventh aspect of the present invention, there is provided a circuit breaker which has a trip switch which is closed when the circuit breaker which is detachably housed in a closed switchboard is tripped, a first contact which is closed when the circuit breaker is closed, and A trip control circuit in which a trip coil of a circuit breaker is connected in series between control power sources, a first voltage detection relay, and a first current limit for limiting a current flowing through the trip voltage to a value smaller than an operating current of the trip coil. First disconnection monitoring circuit in which a resistance for use is connected in parallel with the trip switch, a second voltage detection relay, and a second current limiting circuit for limiting the current flowing through the second voltage detection relay to a value smaller than the operating current of the trip coil. A second disconnection monitoring circuit, in which the circuit breaker is connected in parallel with the first contact in the state where the circuit breaker is inserted in the closed switchboard, and the first voltage detection relay is non-excited and closes after a certain period of time. The relay contact, the relay contact that closes when the second voltage detection relay becomes non-excited, and the delay relay contact that is closed when the circuit breaker is inserted in the switchboard and the connecting means that is connected to the relay contact are connected in series. And a disconnection detection circuit for detecting and outputting disconnection of the trip coil when the relay contact is closed and the connecting means is connected.

The circuit breaker according to claim 8 of the present invention includes a trip switch that closes when the circuit breaker that is detachably housed in the closed switchboard is tripped, a first contact point that closes the circuit breaker in the closed state, and A trip control circuit in which a trip coil of a circuit breaker is connected in series between control power sources, a first voltage detection relay, and a first current limit for limiting a current flowing through the trip voltage to a value smaller than an operating current of the trip coil. First disconnection monitoring circuit in which a resistance for use is connected in parallel with the trip switch, a second voltage detection relay, and a second current limiting circuit for limiting the current flowing through the second voltage detection relay to a value smaller than the operating current of the trip coil. A second disconnection monitoring circuit whose resistance is arranged in the circuit breaker and which is connected in parallel with the first contact, and a delay relay contact which closes after a lapse of a certain time when the first voltage detection relay is de-energized. And the circuit breaker, which is connected to the delay relay contact when the circuit breaker is inserted in the closed switchboard and is closed when the second voltage detection relay is de-energized, the relay contact is connected in series and the delay relay contact and the relay contact are connected. And a disconnection detection circuit for detecting and outputting the disconnection of the trip coil when closed.

According to a ninth aspect of the present invention, in the breaking device according to any one of the first to eighth aspects, a relay contact is used instead of the delay relay contact of the voltage detection relay in the disconnection detection circuit. This is to input to the microcomputer together with other contacts and delay the operation of the relay contacts by programming for a certain period of time to output them according to the AND condition with the other contacts.

Further, according to a tenth aspect of the present invention, in the breaking device according to any one of the first to ninth aspects, an alarm is issued by the output of the disconnection detecting circuit.

According to an eleventh aspect of the present invention, there is provided a disconnecting device including the connecting means according to any one of the fourth, fifth and seventh aspects.
It is composed of a conductive member which is arranged in the breaker and is connected between the terminals of the connection portion with the disconnection detection circuit.

[0025]

In the disconnection detection circuit of the circuit breaker according to claim 1 of the present invention, both the delay relay contact, which is closed when the voltage detection relay is de-excited and a certain time has elapsed, and the second contact, which is closed when the circuit breaker is closed. Disconnection of the trip coil is detected by closing and output.

Further, the disconnection detection circuit of the circuit breaker according to claim 2 of the present invention detects disconnection of the trip coil due to the closing of the delay relay contact which is closed when the voltage detection relay is de-excited for a certain time. Output.

Further, in the disconnection detection circuit of the circuit breaker according to claim 3 of the present invention, the delay relay contact and the second voltage detection relay which are closed after a certain time has passed since the first voltage detection relay was de-excited are de-excited. If the relay contacts are closed, the disconnection of the trip coil is detected and output.

According to a fourth aspect of the present invention, there is provided a disconnection detection circuit for a circuit breaker, which includes a delay relay contact which is closed after a certain time has passed since the voltage detection relay has been de-excited, and a second contact which is closed when the circuit breaker is closed. Both are closed, and the connecting means is connected to the delay relay contact and the second contact, thereby detecting and outputting the disconnection of the trip coil.

Further, in the disconnection detection circuit of the circuit breaker according to the fifth aspect of the present invention, the delay relay contact is closed when the voltage detection relay is de-energized and a predetermined time elapses, and the circuit breaker is inserted in the closed switchboard. The connection means connected to the delay relay contact detects the disconnection of the trip coil and outputs it.

According to a sixth aspect of the present invention, there is provided a circuit breaker detection circuit for a circuit breaker, wherein a delay relay contact disposed in the circuit breaker is closed when a voltage detection relay is de-energized for a predetermined time, and a circuit breaker is closed. The disconnection coil disconnection is detected and output by being connected in the state of being inserted in and the delay relay contact being closed.

Further, in the disconnection detection circuit of the circuit breaker according to claim 7 of the present invention, the first voltage detection relay is de-excited and the delay relay contact which is closed after a lapse of a predetermined time and the second voltage detection relay are non-excited. When the excitation occurs, both the relay contacts that are closed are closed, and the disconnection of the trip coil is detected and output because the connecting means is connected to the delay relay contact and the relay contact.

Further, in the disconnection detection circuit of the circuit breaker according to claim 8 of the present invention, the first voltage detection relay is de-excited and is closed after a lapse of a certain time, and the delay relay contact is disposed in the circuit breaker. Is connected to the delay relay contact in a state of being inserted in the closed switchboard, and when the second voltage detection relay is de-excited, the disconnection of the trip coil is detected by the closing of the relay contact and output.

Further, the relay contact of the voltage detection relay in the disconnection detection circuit of the circuit breaker according to claim 9 of the present invention is input to the microcomputer and the operation is delayed for a predetermined time by programming.

In the tenth aspect of the present invention, the circuit breaker issues an alarm by the output of the disconnection detection circuit.

Further, the conductive member as the connecting means in the circuit breaker according to the eleventh aspect of the present invention causes the disconnection detection circuit to conduct when the circuit breaker is inserted in the closed switchboard.

[0036]

【Example】

Example 1. Embodiments of the present invention will be described below with reference to the drawings. 1 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to a first embodiment of the present invention. In the figure, FIG.
The same parts as those of the conventional device shown in FIG. Reference numeral 24 is a fixed circuit breaker, and 25 is a first current limiting resistor that is connected in series with the first voltage detection relay 19 and in parallel with the trip switch 12. The first voltage detection relay 19 causes a short circuit failure. Even so, the monitoring current flowing therethrough is set to a resistance value that limits it to a value smaller than the operating current of the trip coil 15. 26 is a trip switch 1
2, a trip control circuit composed of both trip contacts 6a and 8a, a first contact 16a and a trip coil 15,
27 is a disconnection monitoring circuit composed of the first voltage detection relay 19 and the first current limiting resistor 25, 28 is the second contact 16b, the first delay relay contact 21 and the detection circuit 2
3 is a disconnection detection circuit.

Next, the operation of the circuit breaker in the first embodiment constructed as described above will be described. First, in the case of the tripping operation as in the conventional device, the first contact 16a is closed in the state where the circuit breaker 24 is closed. Therefore, the tripping switch 12 is closed or the current relay 6 or the ground fault direction relay is closed. 8 detects any failure and each trip contact 6
When a and 8a are closed, the trip coil 15 is excited and the breaker 24 is tripped. For the sake of convenience of explanation, the closing coil side is not shown, but has the same configuration as the conventional device shown in FIG.

During normal operation, the monitoring current flows through the first current limiting resistor 25, the first voltage detection relay 19, the first contact 16a and the trip coil 15 in this order,
Since the first voltage detection relay contact 21 does not close the first delay relay contact 21 because it maintains the excited state, nothing is detected by the detection circuit 23. On the other hand, when the trip coil 15 is broken, the monitoring current cannot flow and the first voltage detection relay 19 is de-energized, so the first delay relay contact 21 closes after a certain period of time. An AND circuit is formed together with the closed second contact 16b, whereby the detection circuit 23 detects that the trip coil 15 has been disconnected, and the disconnection detection circuit 28 outputs an output indicating that the disconnection has occurred.

According to the first embodiment described above, the first current limiting resistor 25 is connected in series with the first voltage detection relay 19 and flows through the trip coil 15 via the first voltage detection relay 19. Since the monitoring current is limited to a value smaller than the operating current of the trip coil 15, even if the first voltage detection relay 19 deteriorates due to long-term use and causes a short circuit failure, the breaker 24 is unnecessary. The reliability can be improved without the tripping operation.

Example 2. Second Embodiment FIG. 2 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to a second embodiment of the present invention.
In the figure, the same parts as those in the first embodiment shown in FIG. Reference numeral 29 is a disconnection monitoring circuit composed of the first voltage detection relay 19 and the first current limiting resistor 25, which is connected in parallel to the trip switch 12 and the first contact 16a and in series to the trip coil 15. As described above, one end is connected between the first contact 16 a and the trip coil 15. Reference numeral 30 is a disconnection detection circuit composed of the first delay relay contact 21 and the detection circuit 23.

In the second embodiment configured as described above, the tripping operation is performed as in the case of the first embodiment, but the monitoring current in the normal state is the first current limiting resistor 25, the first current limiting resistor. The voltage detection relay 19 and the trip coil 15 flow in this order, and the first voltage detection relay 19 maintains the excited state, so the first delay relay contact 21 does not close, and therefore the detection circuit 23 detects nothing. On the other hand, when the trip coil 15 is broken, the monitoring current cannot flow and the first voltage detection relay 19 is de-energized, so that the first delay relay contact 21 is closed after a certain period of time. The detection circuit 23 detects the disconnection of the trip coil 15, and the disconnection detection circuit 28 outputs an output indicating that the disconnection has occurred.

According to the second embodiment, as in the case of the first embodiment, the first current limiting resistor 25 is connected in series, so that the first voltage detection relay 19 can be used for a long time. Even if the circuit breaker 24 deteriorates and causes a short-circuit failure, the circuit breaker 24 does not perform an unnecessary tripping operation, and the reliability can be improved, as a matter of course.
Is connected in parallel with the first contact 16a, it is possible to exert an effect that the disconnection can be monitored regardless of whether the circuit breaker is turned on or off.

Example 3. Third Embodiment FIG. 3 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to a third embodiment of the present invention.
In the figure, the same parts as those in the second embodiment shown in FIG. Reference numeral 31 is a first disconnection monitoring circuit composed of a first voltage detection relay 19 and a first current limiting resistor 25, which is connected in parallel to the trip switch 12. Reference numerals 32 and 33 denote a second voltage detection relay and a second current limiting resistance having the same functions as the first voltage detection relay 19 and the first current limiting resistance 25, and 34 denotes these second voltage detection relays. A second disconnection monitoring circuit composed of 32 and a second current limiting resistor 33, which is connected in parallel to the first contact 16a. 35
Is a relay contact that closes when the second voltage detection relay 32 becomes non-excited, and is connected in series with the first delay relay contact 21. Reference numeral 36 is a disconnection detection circuit composed of the first delay relay contact 21, the relay contact 35, and the detection circuit 23.

In the third embodiment configured as described above, the tripping operation is performed in the same manner as in the above-mentioned respective embodiments, but the monitoring current in the normal state is the first current limiting resistor 25 and the first current limiting resistor 25. Of the voltage detection relay 19, the second current limiting resistor 33, the second voltage detection relay 32, and the trip coil 15 in this order, and the first and second voltage detection relays 1
Since both 9 and 20 maintain the excited state, neither the first delay relay contact 21 nor the relay contact 35 is closed, so that the detection circuit 23 detects nothing.

On the other hand, when the trip coil 15 is broken, the monitoring current cannot flow and the first and second voltage detection relays 19 and 32 are both de-energized. , The first delay relay contact 21 is closed after a lapse of a certain time to form an AND circuit, which causes the detection circuit 23 to trip the trip coil 15
Is detected, and the disconnection detection circuit 36 outputs an output indicating that the trip coil 15 is disconnected.

According to the third embodiment, the first voltage detecting relay 19 is connected in series with the first current limiting resistor 25, and the second voltage detecting relay 32 is connected in series with the second current limiting resistor 33. Since it is connected to the both voltage detection relay 19,
Even if 32 deteriorates due to long-term use and causes a short-circuit failure, the circuit breaker 24 does not perform an unnecessary trip operation,
It goes without saying that the reliability can be improved, and the first disconnection monitoring circuit 31 and the second disconnection monitoring circuit 34 are connected in parallel to the trip switch 12 and the first contact 16a, respectively. Therefore, the trip coil 15
Not only that, the effect that the disconnection of the entire trip control circuit 26 can be detected can be exerted.

Example 4. Fourth Embodiment FIG. 4 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to a fourth embodiment of the present invention.
In the figure, the same parts as those in the first embodiment shown in FIG. Reference numeral 37 denotes a drawer type circuit breaker, which is inserted into the closed switchboard 9 and is connected to the control power sources 11a and 11 via the junction portions 37a and 37b.
connected to b. Reference numeral 38 denotes a conductive member, such as a vinyl electric wire, serving as a connecting means, which is a junction portion 37c,
It is connected between 37d. Reference numeral 39 is a disconnection detection circuit composed of the conductive member 38, the first delay relay contact 21, the second contact 16b, and the detection circuit 23.

In the fourth embodiment configured as described above, the tripping operation is performed in the same manner as in the first embodiment, but the monitoring current in the normal state is the first current limiting resistor 25 and the first current limiting resistor. The voltage detection relay 19, the first contact 16a, and the trip coil 15 flow in this order, and the first voltage detection relay 19 maintains the excited state. Therefore, the first delay relay contact 21 does not close, so the detection circuit 23 Then nothing is detected.

On the other hand, when the trip coil 15 is broken, the monitoring current cannot flow and the first voltage detection relay 19 is de-energized.
Since the delay relay contact 21 is closed, an AND circuit is formed together with the second contact 16b that is closed in advance, whereby the detection circuit 23 detects that the trip coil 15 has been disconnected, and the disconnection detection circuit 28 has disconnected it. The output to that effect is made.

According to the fourth embodiment, since the first current limiting resistor 25 is connected in series to the first voltage detection relay 19, the first voltage detection relay 19 deteriorates due to long-term use. Even if a short-circuit fault occurs, the circuit breaker 37 does not need to be tripped unnecessarily, and the reliability can be improved. In addition, the conductive member 38 closes the circuit breaker 37. When pulled out from 9,
Since the AND circuit of the disconnection detection circuit 39 is not formed, the first delay relay contact is not actually disconnected due to the non-excitation of the first voltage detection relay 19 when the breaker 37 is pulled out. There is an effect that it is possible to prevent the detection circuit 23 from erroneously detecting the disconnection when the circuit 21 is closed.

Example 5. 5 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to a fifth embodiment of the present invention.
In the figure, the same parts as those in the fourth embodiment shown in FIG. Reference numeral 40 is a disconnection monitoring circuit composed of the first voltage detection relay 19 and the first current limiting resistor 25. The circuit breaker 37 is inserted into the closed switchboard 9 and the first disconnection circuit 37 e
Is connected in parallel to the contact 16a. 41 is a conductive member 3
8 is a disconnection detection circuit including a first delay relay 21 and a detection circuit 23.

In the fifth embodiment configured as described above, the tripping operation is performed in the same manner as in the fourth embodiment, but the monitoring current during normal operation is the first current limiting resistor 25 and the first current limiting resistor. The voltage detection relay 19 and the trip coil 15 flow in this order, and the first voltage detection relay 19 maintains the excited state, so the first delay relay contact 21 does not close, and therefore the detection circuit 23 detects nothing.

On the other hand, when the trip coil 15 is broken, the monitoring current cannot flow and the first voltage detection relay 19 is de-energized.
The delay relay contact 21 is closed and is electrically connected by the conductive member 38 connected in advance, whereby the detection circuit 23 detects that the trip coil 15 has been disconnected, and the disconnection detection circuit 28 outputs an output indicating that the disconnection has occurred. It

According to the fifth embodiment, as in the case of the fourth embodiment, since the first current limiting resistor 25 is connected in series, the first voltage detection relay 19 can be used for a long time. Even if the circuit breaker 24 deteriorates and causes a short-circuit failure, the circuit breaker 24 does not perform an unnecessary tripping operation, and the reliability can be improved, as a matter of course.
Is connected in parallel with the first contact 16a, it is possible to exert an effect that the disconnection can be monitored regardless of whether the circuit breaker is turned on or off.

Example 6. 6 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to a sixth embodiment of the present invention.
In the figure, the same parts as those in each of the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 42 denotes a disconnection monitoring circuit composed of the first voltage detection relay 19 and the first current limiting resistor 25, which is disposed in the circuit breaker 37 and is connected to the junction switchboard 9 when the circuit breaker 37 is inserted in the closed switchboard 9. Three
It is connected in parallel to the first contact 16a via 7e. Four
3 is a first delay relay contact 2 arranged in the circuit breaker 37
1 and a detection circuit 23 are disconnection detection circuits.

In the sixth embodiment configured as described above, the tripping operation is performed in the same manner as in the above-mentioned respective embodiments, but the monitoring current during normal operation is the first current limiting resistor 25 and the first current limiting resistor. The voltage detection relay 19 and the trip coil 15 flow in this order, and the first voltage detection relay 19 maintains the excited state, so the first delay relay contact 21 does not close, and therefore the detection circuit 23 detects nothing.

On the other hand, when the trip coil 15 is disconnected, the monitoring current cannot flow and the first voltage detection relay 19 is de-energized.
The delay relay contact 21 of is closed, so that the detection circuit 23
Detects that the trip coil 15 is disconnected, and the disconnection detection circuit 28 outputs an output indicating that the disconnection has occurred.

According to the sixth embodiment, as in the case of each of the above embodiments, the first current limiting resistor 25 is connected in series, so that the first voltage detection relay 19 can be used for a long period of time. Even if the circuit breaker 24 deteriorates and causes a short-circuit failure, the circuit breaker 24 does not need to perform an unnecessary trip operation and the reliability can be improved.
Is arranged in the circuit breaker 37, and the circuit breaker 37 is pulled out from the closed switchboard 9 and at the same time separated from other circuits, so that the disconnection detection circuit 43 can be completed only with the first delay relay contact 21. That effect can also be demonstrated.

Example 7. FIG. 7 is a circuit diagram showing the configuration of a disconnection monitoring unit of a circuit breaker according to a seventh embodiment of the present invention.
In the figure, the same parts as those in each of the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 44 denotes a first disconnection monitoring circuit composed of the first voltage detection relay 19 and the first current limiting resistor 25, which is connected in parallel to the trip switch 12. Reference numeral 45 is a second disconnection monitoring circuit composed of the second voltage detection relay 32 and the second current limiting resistance 33, and the junction parts 37f and 37g are connected in the state where the circuit breaker 37 is inserted into the closed switchboard 9. It is connected in parallel to the first contact 16a via. 46 is a conductive member 3
8, a first delay relay contact 21, a relay contact 35 and a detection circuit 23.

In the seventh embodiment configured as described above, the tripping operation is performed in the same manner as in the above-described respective embodiments, but the monitoring current in the normal state is the first current limiting resistor 25 and the first current limiting resistor. Of the voltage detection relay 19, the second current limiting resistor 33, the second voltage detection relay 32, and the trip coil 15 in this order, and the first and second voltage detection relays 1
Since both 9 and 20 maintain the excited state, neither the first delay relay contact 21 nor the relay contact 35 is closed, so that the detection circuit 23 detects nothing.

On the other hand, when the trip coil 15 is broken, the monitoring current cannot flow and the first and second voltage detection relays 19 and 32 are both de-energized. , The first delay relay contact 21 is closed after a lapse of a certain time to form an AND circuit, which causes the detection circuit 23 to trip the trip coil 15
Is detected, and the disconnection detection circuit 46 outputs an output indicating that the trip coil 15 is disconnected.

According to the seventh embodiment, the first current limiting resistor 25 is connected in series to the first voltage detecting relay 19, and the second current limiting resistor 33 is connected in series to the second voltage detecting relay 32. Since it is connected to the both voltage detection relay 19,
Even if 32 deteriorates due to long-term use and causes a short-circuit failure, the circuit breaker 37 does not perform an unnecessary trip operation,
It becomes possible to improve reliability.

Further, the trip switch 12 and the first contact 16a have a first disconnection monitoring circuit 44 and a second disconnection monitoring circuit 44, respectively.
Since the disconnection monitoring circuit 45 is connected in parallel, disconnection of not only the tripping coil 15 but also the tripping control circuit 26 can be detected, and the circuit breaker 37 is closed by the conductive member 38. Since the AND circuit of the disconnection detection circuit 46 is not formed in the state where the circuit breaker 37 is pulled out, the disconnection of the second voltage detection relay 32 when the circuit breaker 37 is pulled out does not actually cause the disconnection. When the relay contact 35 is closed, the detection circuit 23
It is possible to exert an effect that it is possible to prevent erroneous detection of disconnection.

Example 8. FIG. 8 is a circuit diagram showing the configuration of a disconnection monitoring unit of a circuit breaker according to Embodiment 8 of the present invention.
In the figure, the same parts as those in each of the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 47 denotes a first disconnection monitoring circuit composed of the first voltage detection relay 19 and the first current limiting resistor 25, which is connected in parallel to the trip switch 12.

Reference numeral 48 is a second disconnection monitoring circuit composed of the second voltage detection relay 32 and the second current limiting resistor 33, which is arranged in the circuit breaker 37 and is connected in parallel to the first contact 16a. ing. Then, the second voltage detection relay 32
The relay contact 35 that is closed when is de-excited is disposed in the circuit breaker 37 and is connected between the junction portions 37h and 37i. Reference numeral 49 is a disconnection detection circuit composed of the relay contact 35, the first delay relay contact 21 and the detection circuit 23.

In the eighth embodiment configured as described above, the tripping operation is performed in the same manner as in the above-described respective embodiments, but the monitoring current in the normal state is the first current limiting resistor 25, the first current limiting resistor 25. Of the voltage detection relay 19, the second current limiting resistor 33, the second voltage detection relay 32, and the trip coil 15 in this order, and the first and second voltage detection relays 1
Since both 9 and 20 maintain the excited state, neither the first delay relay contact 21 nor the relay contact 35 is closed, so that the detection circuit 23 detects nothing.

On the other hand, when the trip coil 15 is broken, the monitoring current cannot flow and the first and second voltage detection relays 19 and 32 are both de-energized. , The first delay relay contact 21 is closed after a lapse of a certain time to form an AND circuit, which causes the detection circuit 23 to trip the trip coil 15
Is detected, and the disconnection detection circuit 49 outputs an output indicating that the trip coil 15 is disconnected.

According to the eighth embodiment, as in the case of the seventh embodiment, the first voltage detecting relay 19 is provided with the first current limiting resistor 25, and the second voltage detecting relay 32 is provided with the second current limiting resistor 25. Since the current limiting resistors 33 are connected in series, even if both voltage detection relays 19 and 32 deteriorate due to long-term use and cause a short-circuit fault, the circuit breaker 24 leads to an unnecessary trip operation. Without increasing the reliability.

Further, the trip switch 12 and the first contact 16a have a first disconnection monitoring circuit 47 and a second disconnection monitoring circuit 47, respectively.
Since the disconnection monitoring circuit 48 is connected in parallel, disconnection of not only the tripping coil 15 but also the tripping control circuit 26 can be detected. Furthermore, the relay contact 35 is connected via the junction portions 37h and 37i. Since the circuit breaker 37 is arranged in the circuit breaker 37, the AND circuit of the disconnection detection circuit 49 is not formed in the state where the circuit breaker 37 is pulled out from the closed switchboard 9. Therefore, the second voltage when the circuit breaker 37 is pulled out is set. Due to the non-excitation of the detection relay 32, it is possible to prevent the detection circuit 23 from erroneously detecting the disconnection even though the relay contact 35 is closed although the disconnection is not actually made.

Example 9. In each of the above-described embodiments, only the disconnection monitoring of the trip coil 15 has been described, but it goes without saying that the same effect can be obtained even if the disconnection coil 15 is also monitored for disconnection.

Example 10. Further, in each of the above-mentioned embodiments, as the contact forming the AND circuit of the disconnection detection circuit, the case where the delay relay contact of the voltage detection relay is used is explained, but an ordinary relay contact is used instead of the delay relay contact,
This may be input to the microcomputer together with other contacts, the operation of the relay contact may be delayed by programming for a certain period of time, and output depending on the AND condition with other contacts,
It goes without saying that the same effects as those of the above-mentioned respective embodiments can be exhibited, and it becomes possible to easily change the setting of the delay time by programming in the microcomputer, and the optimum delay time setting according to the type of circuit breaker can be set. Will be possible.

Example 11. In addition, each of the above-mentioned Examples 4, 5, and 7
In the above, the case where a conductive member for connecting the junction portions is applied as the connecting means has been described, but the present invention is not limited to this, and although not shown, for example, in the state where the circuit breaker is inserted in the closed switchboard. The closing micro switch may be installed in the closing switchboard, and the contact of the micro switch may be connected in series to the disconnection detection circuit, and the same effect as each of the above embodiments can be exhibited.

Example 12 In each of the above embodiments,
The reliability can be further improved by inputting the output of the disconnection detection circuit to an alarm means such as a buzzer or an alarm lamp to issue an alarm.

[0074]

As described above, according to the first aspect of the present invention, the trip switch which is closed when the circuit breaker housed in the closed switchboard is tripped, and the circuit breaker which is closed in the first state
The trip control circuit in which the trip coil of the contact and the breaker of the circuit breaker are connected in series between the control power supplies, the voltage detection relay, and the current limiting resistor that limits the current flowing through it to a value smaller than the operating current of the trip coil A disconnection monitoring circuit connected in parallel with the trip switch and in series with the first contact and the trip coil, and a delay relay contact and circuit breaker that are closed after a certain time has passed since the voltage detection relay has been de-excited. Since the second contact connected in series is connected in series, and the delay relay contact and the disconnection detection circuit that detects and outputs the disconnection of the trip coil when the second contact is closed, the voltage detection relay is provided for a long time. Provided is a circuit breaker capable of improving reliability without causing unnecessary tripping of the circuit breaker even if the circuit breaks due to use and causes a short circuit failure. Door can be.

According to a second aspect of the present invention, a trip switch which is closed when the circuit breaker housed in the closed switchboard is tripped, a first contact which is closed when the circuit breaker is closed, and a trip coil of the circuit breaker. Is connected in series between the control power sources, the voltage detection relay, and the current limiting resistor that limits the current flowing through the voltage detection relay to a value smaller than the operating current of the trip coil, the trip switch and the first contact. The disconnection monitoring circuit connected in parallel and in series with the trip coil and the delay relay contact that is closed after the voltage detection relay has been de-excited for a certain time and the delay relay contact is closed With a disconnection detection circuit that detects and outputs a disconnection, the circuit breaker is not required even if the voltage detection relay deteriorates due to long-term use and causes a short circuit failure. It is possible to provide not only a disconnection operation but also improvement in reliability, and also to provide a disconnection device capable of performing disconnection monitoring regardless of whether the circuit breaker is turned on or off. it can.

According to a third aspect of the present invention, a trip switch which is closed when the circuit breaker housed in the closed switchboard is tripped, a first contact which is closed when the circuit breaker is closed, and a trip coil of the circuit breaker. Is connected in series between the control power supplies, a first voltage detection relay and a first current limiting resistor that limits the current flowing through the first voltage detection relay to a value smaller than the operating current of the trip coil. A first disconnection monitoring circuit connected in parallel with the second voltage detection relay, and a second current limiting resistance for limiting the current flowing through the second voltage detection relay to a value smaller than the operating current of the trip coil, and the first contact. A second disconnection monitoring circuit connected in parallel with
The delay relay contact, which closes when the first voltage detection relay is de-excited and has passed for a certain time, and the relay contact which closes when the second voltage detection relay is de-excited, are connected in series and the delay relay contact and the relay contact are closed Since it is equipped with a disconnection detection circuit that detects and outputs a disconnection of the trip coil, the circuit breaker can lead to unnecessary tripping operation even if the voltage detection relay deteriorates due to long-term use and causes a short-circuit failure. Not only that, it is possible to improve the reliability, and it is also possible to provide a breaker capable of detecting disconnection of not only the trip coil but also the trip control circuit.

According to a fourth aspect of the present invention, a trip switch which is closed when the circuit breaker which is detachably housed in the closed switchboard is tripped, a first contact which is closed when the circuit breaker is closed, and a circuit breaker. The tripping control circuit in which the tripping coil is connected in series between the control power supplies, the voltage detection relay and the current limiting resistor that limits the current flowing through it to a value smaller than the operating current of the tripping coil are in parallel with the tripping switch. In addition, the circuit breaker monitoring circuit connected in series with the trip coil with the circuit breaker inserted in the closed switchboard, the delay relay contact that closes after a certain time with the voltage detection relay de-excited, and the circuit breaker closed. A delay relay contact in which connecting means connected to the delay relay contact and the second contact is connected in series in a state where the second contact and the circuit breaker are inserted into the closed switchboard. And a disconnection detection circuit for detecting and outputting disconnection of the trip coil when both the second contacts are closed and the connecting means is connected. Therefore, the voltage detection relay deteriorates due to long-term use and short-circuit failure occurs. Even if the circuit breaker occurs, the circuit breaker does not need to be tripped unnecessarily, and the reliability can be improved, and it is also possible to prevent erroneous detection of disconnection due to pulling out the circuit breaker. Can be provided.

According to a fifth aspect of the present invention, a trip switch which is closed when the circuit breaker which is detachably housed in the closed switchboard is tripped, a first contact which is closed when the circuit breaker is closed, and a circuit breaker. The trip control circuit in which the trip coil is connected in series between the control power supplies, the voltage detection relay, and the current limiting resistor that limits the current flowing through it to a value smaller than the operating current of the trip coil A disconnection monitoring circuit connected in parallel with the contact No. 1 and in series with the trip coil in a state where the circuit breaker is inserted in the closed switchboard, and a delay relay contact that is closed after a certain time has passed since the voltage detection relay has been de-excited. Connection means connected to the delay relay contact in a state where the breaker is inserted in the closed switchboard are connected in series, the delay relay contact is closed and the connection means is connected Since a disconnection detecting circuit for detecting and outputting a disconnection of more pull off the coil, even cause deterioration short-circuited by using the voltage detection relay for a long time,
It is possible to improve reliability without the need for the tripping operation of the circuit breaker, and it is also possible to perform disconnection monitoring regardless of whether the circuit breaker is turned on or off. A device can be provided.

According to a sixth aspect of the present invention, a tripping switch which is closed when the circuit breaker which is detachably housed in the closed switchboard is tripped, a first contact which is closed when the circuit breaker is closed, and a circuit breaker. A trip control circuit in which the trip coil is connected in series between control power supplies, a voltage detection relay, and a current limiting resistor that limits the current flowing through the trip coil to a value smaller than the operating current of the trip coil are placed in the circuit breaker. A disconnection monitoring circuit connected in parallel with the trip switch and the first contact and in series with the trip coil with the circuit breaker inserted in the closed switchboard, and the voltage detection relay arranged in the circuit breaker being de-energized. After a certain period of time, the delay relay contact is closed and the breaker is connected with the circuit breaker inserted in the switchboard, and the delay relay contact is closed to detect disconnection of the trip coil. Since it is equipped with a disconnection detection circuit that outputs the output, even if the voltage detection relay deteriorates due to long-term use and causes a short-circuit failure, the circuit breaker does not lead to unnecessary tripping operation and the reliability is improved. It is of course possible to provide a breaker capable of simplifying the disconnection detection circuit.

Further, according to claim 7 of the present invention, a trip switch which is closed when the circuit breaker which is detachably housed in the closed switchboard is tripped, a first contact which is closed when the circuit breaker is closed, and a circuit breaker. Trip control circuit having a trip coil connected in series between control power sources, a first voltage detection relay, and a first current limiting resistor for limiting the current flowing through the trip coil to a value smaller than the operating current of the trip coil. Includes a first disconnection monitoring circuit connected in parallel with the trip switch, a second voltage detection relay and a second current limiting resistor for limiting the current flowing through the second voltage detection relay to a value smaller than the operating current of the trip coil. A second disconnection monitoring circuit connected in parallel with the first contact in a state where the breaker is inserted in the closed switchboard;
Delay relay contact that closes when the voltage detection relay is de-excited for a certain period of time, a relay contact that closes when the second voltage detection relay is de-excited, and a delay relay contact and relay with the breaker inserted in the closed switchboard Since the connection means connected to the contact is connected in series and the delay relay contact and the relay contact are closed and the connection means is connected, the disconnection detection circuit for detecting and outputting the disconnection of the trip coil is provided. Even if the detection relay deteriorates due to long-term use and causes a short-circuit fault, the circuit breaker does not lead to unnecessary tripping operation, and it is possible to improve the reliability. Not only to provide a disconnection device that can detect disconnection of the entire trip control circuit, and can prevent erroneous detection of disconnection caused by pulling out the breaker It can be.

Further, according to claim 8 of the present invention, a trip switch which is closed when the circuit breaker which is removably housed in the closed switchboard is tripped, a first contact which is closed when the circuit breaker is closed, and a circuit breaker. Trip control circuit having a trip coil connected in series between control power sources, a first voltage detection relay, and a first current limiting resistor for limiting the current flowing through the trip coil to a value smaller than the operating current of the trip coil. Includes a first disconnection monitoring circuit connected in parallel with the trip switch, a second voltage detection relay and a second current limiting resistor for limiting the current flowing through the second voltage detection relay to a value smaller than the operating current of the trip coil. A second disconnection monitoring circuit arranged in the circuit breaker and connected in parallel with the first contact, and a delay relay contact and interruption that closes after a lapse of a certain time when the first voltage detection relay is de-excited The relay contact is connected in series and the delay relay contact and the relay contact are closed when the second voltage detection relay is de-energized and is connected to the delay relay contact with the circuit breaker inside the switchgear With a disconnection detection circuit that detects and outputs a disconnection of the trip coil, the circuit breaker can lead to unnecessary tripping operation even if the pressure detection relay deteriorates due to long-term use and causes a short circuit failure. In addition, it is possible to provide a circuit breaker capable of preventing erroneous detection of disconnection caused by pulling out the circuit breaker, as well as improving reliability.

According to claim 9 of the present invention, a relay contact is used in place of the delay relay contact of the voltage detection relay in the disconnection detection circuit, and this relay contact is input to the microcomputer together with other contacts to program the relay contact. Since the operation is delayed for a certain period of time and is output depending on the AND condition with other contacts, it is possible to provide a circuit breaker capable of setting an optimum delay time according to the type of circuit breaker.

Further, according to the tenth aspect of the present invention, since the alarm is issued by the output of the disconnection detection circuit, it is possible to provide the interruption device capable of further improving the reliability.

According to the eleventh aspect of the present invention, since the connecting means is constituted by the conductive member which is arranged in the breaker and is connected between the terminals of the connecting portion with the disconnection detecting circuit, the disconnection detecting circuit is connected. It is possible to provide a blocking device that can be simplified.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to a third embodiment of the present invention.

FIG. 4 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to a fourth embodiment of the present invention.

FIG. 5 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to a fifth embodiment of the present invention.

FIG. 6 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to a sixth embodiment of the present invention.

FIG. 7 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to a seventh embodiment of the present invention.

FIG. 8 is a circuit diagram showing a configuration of a disconnection monitoring unit of a circuit breaker according to Embodiment 8 of the present invention.

FIG. 9 is a single line connection diagram showing a configuration of a general power receiving and distributing facility of a high-voltage customer.

FIG. 10 is a circuit diagram showing a configuration of a disconnection monitoring unit of a conventional circuit breaker.

[Explanation of symbols]

9 closed switchboard, 11a, 11b control power supply, 12 trip switch, 15 trip coil, 16a first contact, 16b second contact, 19 first voltage detection relay, 21 first delay relay contact, 24 fixed Type circuit breaker, 25 first resistor for limiting current, 26 tripping control circuit, 27, 29, 40, 42 disconnection monitoring circuit, 28,
30, 36, 39, 41, 43, 46, 49 Disconnection detection circuit, 31, 44, 47 First disconnection monitoring circuit, 32
Second voltage detection relay, 33 second current limiting resistor,
34, 45, 48 2nd disconnection monitoring circuit, 35 relay contact, 37 drawer type circuit breaker, 38 conductive member (connecting means).

Claims (11)

[Claims] 1. A trip switch which is closed when the circuit breaker housed in a closed switchboard is tripped, a first contact which is closed when the circuit breaker is closed, and a trip coil of the circuit breaker are connected in series between control power supplies. The tripping control circuit, the voltage detection relay, and the current limiting resistor for limiting the current flowing through the tripping coil to a value smaller than the operating current of the tripping coil are in parallel with the tripping switch and the first contact and the tripping switch. A disconnection monitoring circuit connected in series with the coil, a delay relay contact that closes after a certain period of time when the voltage detection relay has been de-excited and a second contact that closes when the breaker is closed are connected in series. A disconnection detection circuit for detecting and outputting the disconnection of the trip coil when the delay relay contact and the second contact are closed. Breaking device. 2. A trip switch which is closed when the circuit breaker housed in the closed switchboard is tripped, a first contact which is closed when the circuit breaker is closed, and a trip coil of the circuit breaker are connected in series between control power supplies. The tripping control circuit, the voltage detection relay, and the current limiting resistor for limiting the current flowing through the tripping coil to a value smaller than the operating current of the tripping coil are in parallel with the tripping switch and the first contact and the tripping circuit. The disconnection monitoring circuit connected in series with the coil and the delay relay contact that is closed when the voltage detection relay is de-excited for a certain period of time are connected and the delay relay contact is closed to disconnect the trip coil. A disconnection device, comprising: a disconnection detection circuit for detecting and outputting. 3. A trip switch that closes when tripping a circuit breaker housed in a closed switchboard, a first contact point that closes when the circuit breaker is closed, and a trip coil of the circuit breaker that are connected in series between control power supplies. The trip control circuit, the first voltage detection relay, and the first current limiting resistor for limiting the current flowing through the first voltage detection relay to a value smaller than the operating current of the trip coil are connected in parallel with the trip switch. A first disconnection monitoring circuit, a second voltage detection relay, and a second current limiting resistor for limiting the current flowing through the second voltage detection relay to a value smaller than the operating current of the trip coil are connected in parallel with the first contact. The closed second disconnection monitoring circuit and the first voltage detection relay are closed when the first voltage detection relay is de-excited and the delay relay contact and the second voltage detection relay are de-excited. A disconnection detecting circuit for detecting and outputting a disconnection of the trip coil when the delay relay contact and the relay contact are closed and the relay contacts are connected in series. 4. A trip switch that closes when tripping a circuit breaker that is removably housed in a closed switchboard, a first contact point that closes the circuit breaker in a closed state, and a trip coil of the circuit breaker between control power sources. The trip control circuit connected in series with the voltage detection relay and the current limiting resistor that limits the current flowing through it to a value smaller than the operating current of the trip coil are in parallel with the trip switch and the circuit breaker is A disconnection monitoring circuit that is connected in series with the trip coil while it is inserted in the closed switchboard, a delay relay contact that closes when the voltage detection relay is de-excited and a certain time has elapsed, and the circuit breaker closes in the closed state. A connecting means connected to the delay relay contact and the second contact with the second contact and the breaker inserted in the closed switchboard is connected in series. A disconnection detecting circuit for detecting and outputting the disconnection of the trip coil when the delay relay contact and the second contact are closed and the connecting means is connected. 5. A trip switch that closes when a circuit breaker that is detachably housed in a closed switchboard is tripped, a first contact that closes the circuit breaker in a closed state, and a trip coil of the circuit breaker are between a control power source. A trip control circuit connected in series with the voltage detection relay and a current limiting resistor for limiting the current flowing through the trip relay to a value smaller than the operating current of the trip coil in parallel with the trip switch and the first contact. And a disconnection monitoring circuit connected in series with the trip coil in a state where the circuit breaker is inserted in the closed switchboard, and a delay relay contact that closes after a certain period of time when the voltage detection relay becomes non-excited and the circuit breaks. Connection means connected to the delay relay contact in a state where the container is inserted in the closed switchboard and the delay relay contact is closed and connected. A disconnection detecting circuit for detecting and outputting the disconnection of the trip coil when the means is connected. 6. A trip switch that closes when a circuit breaker that is detachably housed in a closed switchboard is tripped, a first contact that closes the circuit breaker in a closed state, and a trip coil of the circuit breaker are between a control power supply. A trip control circuit connected in series with the voltage detection relay and a current limiting resistor for limiting the current flowing through the trip to a value smaller than the operating current of the trip coil. A disconnection monitoring circuit to which the circuit breaker is connected in parallel with the first contact and in series with the trip coil while the circuit breaker is inserted in the closed switchboard; and the voltage detection relay disposed in the circuit breaker is not excited. The delay relay contact that closes after a certain period of time is connected by the circuit breaker being inserted into the closed switchboard and the delay relay contact closes. A disconnection detection circuit that detects a disconnection of a tripping coil and outputs the detected disconnection coil. 7. A trip switch that closes when a circuit breaker that is detachably housed in a closed switchboard is tripped, a first contact that closes the circuit breaker in a closed state, and a trip coil of the circuit breaker are between a control power source. A trip control circuit connected in series with the first voltage detection relay and a first current limiting resistor for limiting the current flowing through the first voltage detection relay to a value smaller than the operating current of the trip coil in parallel with the trip switch. A first disconnection monitoring circuit connected to the second voltage detection relay, a second voltage detection relay, and a second current limiting resistor for limiting the current flowing through the second voltage detection relay to a value smaller than the operating current of the trip coil. A second disconnection monitoring circuit connected in parallel with the circuit breaker inserted in the closed switchboard, and a delay delay circuit closed when the first voltage detection relay is de-excited for a certain period of time. Ray contact, a relay contact that closes when the second voltage detection relay is de-excited, and a connecting means that is connected to the delay relay contact and the relay contact in a state where the breaker is inserted in the closed switchboard, are connected in series. A disconnection device comprising: a disconnection detection circuit that detects and outputs a disconnection of the trip coil when the delay relay contact and the relay contact are closed and the connection means is connected. 8. A trip switch that closes when a circuit breaker that is detachably housed in a closed switchboard is tripped, a first contact that closes the circuit breaker in a closed state, and a trip coil of the circuit breaker are between a control power supply. A trip control circuit connected in series with the first voltage detection relay and a first current limiting resistor for limiting the current flowing through the first voltage detection relay to a value smaller than the operating current of the trip coil in parallel with the trip switch. A first disconnection monitoring circuit connected to the second disconnection circuit, a second voltage detection relay, and a second current limiting resistance for limiting the current flowing through the second disconnection relay to a value smaller than the operating current of the trip coil are provided in the breaker. A second disconnection monitoring circuit which is arranged and connected in parallel with the first contact; a delay relay contact which closes after a lapse of a certain time when the first voltage detection relay is de-excited; Relay contacts arranged in a circuit breaker and connected to the delay relay contact in a state where the circuit breaker is inserted in the closed switchboard and closed when the second voltage detection relay is de-energized are connected in series and the delay relay contact is connected. And a disconnection detection circuit for detecting and outputting disconnection of the trip coil when the relay contact is closed. 9. A relay contact is used in place of the delay relay contact of the voltage detection relay in the disconnection detection circuit, and the relay contact is input to a microcomputer together with other contacts to delay the operation of the relay contact for a predetermined time by programming. 9. The circuit breaker according to claim 1, wherein an output is made according to an AND condition with the contact. 10. An alarm is issued by the output of the disconnection detection circuit.
The interruption device according to any one of 1. 11. The connection means is a conductive member arranged in the circuit breaker and connected between the terminals of the connection portion with the disconnection detection circuit, according to claim 4, 5, or 7. Breaking device.