JP2005019181A - Lockout relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lockout relay in which an electric equipment which constitutes a plant is separated from an electric circuit by being forcibly actuated from the outside in the case either of an operating coil part or an action spring part is damaged. <P>SOLUTION: In the lockout relay in which the operating coil is magnetized and thereby an armature is attracted and it becomes in an acting state and the armature in this acting state is made to be caught mechanically by a catching part, one end of it is arranged on the front board side of the lockout relay as a knob part, the other end is made the armature operating end, and a drive rod for compulsive action arranged at the armature is installed along the lockout relay. Then, by operating the knob part, the armature is compulsorily moved up to the action position, and mechanical state of catching by the catch part is released. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lockout relay used in an electrical protection circuit of a plant such as a power plant or a general industrial plant.
[0002]
[Prior art]
A lockout relay is a type of auxiliary power relay that is used in electrical protection circuits of power plants, general industrial plants, and other plants. When the protective relay is activated, it is mechanically maintained in response. By doing so, the response of the other relay is blocked, and the blocked state is released by manual operation.
[0003]
Hereinafter, a lockout relay conventionally used will be described with reference to FIGS. 10 and 11. FIG. 10 is a circuit diagram showing a connection state of the lockout relay. In FIG. 10, reference numeral 1 denotes a lockout relay, which is connected between control power supply buses P and N via an output a contact (hereinafter referred to as a protective relay contact) 6 of a protective relay (not shown). In the lockout relay 1, when the protective relay contact 6 is closed, the operating coil 4 is excited via the self-breaking contacts 2 and 3, and the trip signal is output to the circuit breaker by the output contact 5, so that the electric equipment constituting the plant is connected to the electric circuit. Protecting equipment and preventing the spread of accidents by disconnecting from
[0004]
FIG. 11 is a view showing the outer shape and internal details of the lockout relay, (a) is the outer shape, (b) is an enlarged perspective view of the catch portion, (c) and (d) are the states of the operating coil and the armature. The (d) arrow view shown, and (e) are enlarged views of the hatched portion (c).
[0005]
In FIGS. 11A and 11B, reference numeral 7 denotes a handle that is twisted by an operator or the like, and is fixed to one end of a shaft 9 that penetrates the front plate 8. The shaft 9 has a movable portion of a plurality of contacts (the self-interrupting contacts 2 and 3 and a plurality of output contacts 5) fixed at an intermediate portion, and a catch portion 10 and an operation spring 11 are provided at the other end portion. Yes. The operation coil 4 is disposed behind the operation spring 11 via a back plate 15, and the armature 12 is attracted to the iron core 13 when the operation coil 4 is excited.
[0006]
The armature 12 is supported by the back plate 15 so that both end portions can be tilted in opposite directions with the intermediate portion as a fulcrum, and opposite to the portion sucked by the iron core 13 with the back plate 15 as a boundary. This part is made to function as the stopper 14. When the armature 12 is sucked by the iron core 13, the stopper 14 moves in the reverse direction to release the locked state of the catch portion 10.
[0007]
Normally, in the process of setting the handle 7 to the set position (twisted to the right), when the shaft 9 is rotated as indicated by the arrow in FIG. 11B, the catch portion 10 is also rotated integrally. The roller 16 attached to the tip of the roller 16 is pushed down while contacting the tapered roller groove of the stopper 14 and is locked when the stopper 14 is passed over. In this state, the reverse rotation operation in which the shaft 9 tries to return to the original position is prevented (FIG. 11e). In this state, the operation spring 11 is stored by the shaft 9.
[0008]
Here, in the circuit shown in FIG. 10, when the protective relay contact 6 is closed and the operating coil 4 of the lockout relay 1 is excited, the iron core 13 provided in the operating coil 4 of the lockout relay 1 becomes an electromagnet. As shown in the state (d) from the state 11 (c), the armature 12 is sucked into the iron core 13. As a result, the stopper 14 moves downward with the back plate 15 as a fulcrum, releases the locked state, rotates the shaft 9 by the restoring force of the operating spring 11, and connects the contact (2, 3, 5) of the lockout relay. Make it work.
[0009]
By the way, in the above-mentioned lockout relay and its peripheral circuits, the protection relay contact 6 is abnormal, the connection line connecting the contact 6 and the operating coil 4 of the lockout relay 1 is broken, the aging of the lockout relay 1 and so on. When either the operation coil 4 or the operation spring 11 is damaged, it cannot operate normally.
[0010]
For this reason, there is also a device that has improved reliability by detecting in advance an abnormality of the protective relay contact 6 or a disconnection of a connection line connecting the protective relay contact 6 and the operation coil 4 of the lockout relay (for example, , See Patent Document 1).
[0011]
[Patent Document 1]
JP 63-167627 A (page 2-3, FIG. 1)
[0012]
[Problems to be solved by the invention]
However, in the invention described in Patent Document 1, no measures are taken when either the operating coil portion or the operating spring portion of the lockout relay is damaged. For this reason, when one of these parts is damaged, the electric equipment which comprises a plant cannot be disconnected from an electric circuit, and there exists a possibility of extending an accident.
[0013]
The first object of the present invention is to solve the problems of the prior art, and is a lockout relay that can be forcibly operated from the outside when the operating coil part, the operating spring part, etc. are damaged. Is to provide.
[0014]
A second object of the present invention is to provide a lockout relay capable of notifying an operator by an alarm means when an operating coil portion, a spring portion, or the like is damaged.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, the invention of the lockout relay according to claim 1 is the lockout relay in which the catch portion is mechanically locked by the armature driven by exciting the operating coil. One end is arranged on the front plate side of the lockout relay as a knob part, and a forcible operation drive rod is arranged along the lockout relay with the other end arranged close to the armature, and the knob part is operated. Thus, the armature is forcibly moved to the operating position by the operating end to release the mechanically locked state of the catch portion.
[0016]
Further, the invention of the lockout relay according to claim 2 is the lockout relay in which the operation coil is connected to operate by being excited when the protective relay contact is closed and the excitation current is cut off by the self-interrupt contact after the operation. An alarm device is connected in series with the protective relay contact and in parallel with the operating coil.
[0017]
Further, the invention of the lockout relay according to claim 3 is the lockout relay in which the operation coil is connected to operate by being excited when the protective relay contact is closed and the excitation current is cut off by the self-interrupt contact after the operation. A heating wire connected in series with the protective relay contact and in parallel with the operating coil, and a contact that is in an open state when not heated from the heating wire, and is deformed in shape when heated by the heating wire and closed. It is provided with.
[0018]
Further, the invention of the lockout relay according to claim 4 is the lockout relay in which the operation coil is connected to operate by being excited when the protective relay contact is closed and the excitation current is cut off by the self-interrupt contact after the operation. The operating coil is a multiple winding.
[0019]
Further, the invention of the lockout relay according to claim 6 is the operation of the lockout relay in which the operation coil is connected to be operated so that the excitation current is cut off by the self-cutoff contact after the operation when the protection relay contact is closed. A plurality of coils are attached.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol or a related code | symbol is attached | subjected to the part which is common throughout each figure, and description is abbreviate | omitted.
[0021]
(First embodiment)
FIGS. 1A and 1B are views showing the outer shape and internal details of a lockout relay according to a first embodiment of the present invention, wherein FIG. 1A is a perspective view of the whole, FIG. 1B is a front view, and FIG. (D) is an enlarged view of (a) part of a catch part, and (e) is a figure which shows the drive rod for forced operation, respectively.
[0022]
In the present embodiment, measures are taken when the lockout relay 1 cannot operate normally due to disconnection of an electric circuit such as the operation coil 4 or an abnormality of a mechanism unit such as the operation spring 11.
[0023]
The lockout relay 1 according to the present embodiment has an L-shaped forced operation drive rod (hereinafter referred to as an operation drive rod) 17 shown in FIGS. It is arranged in parallel at the bottom. The operation drive rod 17 has one end projecting from the front plate 8 to the lower portion of the handle 7 as a knob portion 17-1, and the operation end 17-2 located on the opposite side of the knob portion 17-1 is bent at a substantially right angle. Are arranged close to the lower portion of the stopper 14. The operation drive rod 17 is always kept inclined downward by its own weight or by a spring (not shown) so that normal operation is not hindered.
[0024]
In this state, if the operator pushes down the knob 17-1 projecting from the front plate 8 downward as indicated by the arrow A1 due to the failure of the lockout relay 1, the operation drive rod 17 is moved to the front plate 8 as shown in FIG. As a fulcrum, the operating end 17-2 is lifted as indicated by an arrow A2, and the armature 12 is forcibly moved from below to the iron core 13. Then, since the stopper 14 is pushed down in the reverse direction with the back plate 15 as a fulcrum, the roller 16 of the catch portion 10 that is in contact with the stopper 14 rotates to the right in FIG. 1C and FIG. As a result, the locked state of the catch unit 10 is released, and the lockout relay 1 is forcibly operated.
[0025]
As described above, according to the present embodiment, the operation end 17-2 of the L-shaped return drive rod 17 is arranged to face the lower portion of the stopper 14 provided on the extension of the armature 12. Even if the lockout relay 1 itself cannot be operated due to disconnection of the electric circuit such as the operation coil 4 or breakage of the operation spring 11, the operator pushes down the knob 17-1 protruding from the front plate 8. By doing so, the lockout relay 1 can be artificially forcibly operated to send a trip signal.
[0026]
(Second Embodiment)
FIG. 2 is a diagram showing the outer shape and internal details of the lockout relay of the second embodiment, (a) is a perspective view of the whole, (b) is a front view, (c) is a perspective view of a catch part, (D) is an enlarged view of part (b), and (e) shows a driving rod for forced operation.
[0027]
The present embodiment is similar to the first embodiment in that measures are taken such as disconnection of the operating coil 4 and breakage of the operating spring 11, but the first embodiment is not changed. However, in the present embodiment, the lock is released by the pushing operation of the forcible operation driving rod 17, whereas the lock is released by the pushing operation of the forcing operation driving rod 17. Slightly different.
[0028]
That is, in this embodiment, a U-shaped operation piece 17-3 is attached to the operation end 17-2 of the forcible operation drive rod 17, and the operation piece 17-3 is arranged above the stopper 14. It is a thing.
[0029]
In this embodiment, when the operator raises the knob 17-1 of the forcible operation drive rod 17 as shown by an arrow B1, the operation piece 17-3 of the forcible operation drive rod 17 is directly stopped. 14 is pushed down as shown by an arrow B2, and the lock-out relay 1 can be artificially and forcibly operated by releasing the locked state at the catch portion 10 as in the first embodiment.
[0030]
(Third embodiment)
A third embodiment will be described with reference to FIG. This embodiment is configured to issue an alarm when the operating coil is disconnected.
[0031]
FIG. 3 is a circuit diagram showing the present embodiment, in which an alarm device 18 is connected in parallel with the operating coil 4. In FIG. 3, if the operating coil 4 of the lockout relay 1 is normal, when the protective relay contact 6 is closed (operated), the operating coil 4 of the lockout relay 1 is excited and the self-interrupting contacts 2 and 3 are opened. The circuit breaker tripping contact 5 is closed.
[0032]
However, if the operating coil 4 of the lockout relay 1 is abnormal due to disconnection or the like, the protective relay contact 6 will be erroneously inoperable even if the protective relay contact 6 is closed. The instrument tripping contact 5 remains closed.
[0033]
As a result, since the voltage between the PN of the control power supply is applied to the alarm device 18 via the protective relay contact 6 and the self-interrupt contacts 2 and 3 of the lockout relay 1, the alarm device 18 is activated by sound. Alert the operator with an alarm.
The operator can know the malfunction of the lockout relay 1 from this sound. This sound may be a voice or a melody.
[0034]
As described above, according to the present embodiment, since the alarm device is connected in parallel to the operating coil, when the lockout relay malfunctions, the alarm device is controlled via its self-interruptible contact. Since the power supply voltage is applied, it is possible to notify the operator of an abnormality of the operating coil by a sound warning.
[0035]
(Fourth embodiment)
A fourth embodiment will be described with reference to FIG. FIG. 4 is a circuit diagram showing this embodiment. As in the third embodiment, this embodiment is also configured to issue an alarm when the lockout relay 1 malfunctions, but the difference is that a warning is displayed instead of sound. Is. In FIG. 4, reference numeral 19 denotes a display device as an alarm device. Since the other configuration and operation are the same as those of the third embodiment, the description thereof is omitted.
[0036]
(Fifth embodiment)
A fifth embodiment will be described with reference to FIG. 5A and 5B are circuit diagrams showing the present embodiment, in which FIG. 5A is a circuit diagram of a lockout relay, and FIG. 5B is an enlarged view showing a part of the lockout relay.
[0037]
In FIG. 5A, 20 is a heating wire connected in parallel with the operating coil 4, and 21 is a circuit breaker tripping contact of the lockout relay 1 made of shape memory alloy that is heated and controlled by this heating wire 20. It is. When the output contact 21 made of shape memory alloy is not heated, the open circuit state shown in FIG. 5B is maintained, and when heated, the shape is memorized so as to be deformed and closed as shown in FIG. 5C. Yes.
[0038]
In the normal state in which the protective relay contact 6 is in the open state, no voltage is applied to the lockout relay 1, so the heating wire 20 is not heated, so that the contacts 2, 3, and 5 maintain the state shown in the figure. ing. When the protective relay contact 6 is closed, if the lockout relay 1 operates normally, the circuit breaker tripping contact 5 is closed and the self-breaking contacts 2 and 3 are opened.
[0039]
However, when the protective relay contact 6 is opened, if the lockout relay 1 malfunctions, the control power supply voltage is applied to the operating coil 4 and the heating wire 20, and the current is also shunted to the heating wire 20. As a result, the heating wire 20 generates heat. As a result, the output contact 21 made of shape memory alloy is transformed from the state of FIG. 5B to the state of FIG. By closing the contact 21, a circuit breaker trip signal is output, and the same state as the state in which the lockout relay 1 is operated can be obtained.
[0040]
(Sixth embodiment)
A sixth embodiment will be described with reference to FIG. FIG. 6 is a schematic view of the winding of the lockout relay coil according to the sixth embodiment.
[0041]
In FIG. 6, when the operating coil 4 of the lockout relay 1 is double-wrapped by the coils 4C1 and 4C2 and one coil 4C1 is disconnected, the other healthy coil 4C2 causes an error in the operating coil 4 of the lockout relay 1 The operation is prevented.
In the present embodiment, the reliability of the lockout relay 1 can be improved by making the operating coil 4 into a double winding.
[0042]
(Seventh embodiment)
A seventh embodiment will be described with reference to FIG. FIG. 7 is a winding schematic diagram of a lockout relay coil according to a seventh embodiment.
[0043]
This embodiment is different from the sixth embodiment in that a changeover switch 22 is provided between the two coils 4C1 and 4C2 wound twice, but the other is different from the case of FIG. There is no change.
[0044]
Normally, the changeover switch 22 is connected to the coil 4C1 side, and when the coil 4C1 is disconnected, the operator or the like is artificially switched to the coil 4C2 side that is healthy.
Also in this embodiment, the reliability of the lockout relay can be improved.
[0045]
(Eighth embodiment)
An eighth embodiment will be described with reference to FIG. 8A and 8B are diagrams showing the operating coil of the lockout relay 1 according to the eighth embodiment. FIG. 8A is a schematic layout diagram of the operating coil, and FIG. 8B is a circuit diagram of the operating coil.
[0046]
In this embodiment, as can be seen from FIGS. 8A and 8B, two operating coils 23 and 24 are prepared instead of the operating coil 4 of the lockout relay 1, and these operating coils 23 and 24 are connected in parallel. Is.
[0047]
According to the present embodiment, since the operating coils 23 and 24 are connected in parallel, when the operating coil of one of the lockout relays becomes defective, the lockout relay 1 is normally operated by the other healthy operating coil. The reliability of the lockout relay can be improved.
[0048]
(Ninth embodiment)
A ninth embodiment will be described with reference to FIG. 9A and 9B are diagrams showing the operating coil of the lockout relay 1 according to the ninth embodiment, where FIG. 9A is a schematic layout diagram of the operating coil, and FIG. 9B is a circuit diagram of the operating coil.
[0049]
In the present embodiment, a changeover switch 22 for switching between two operating coils 23 and 24 is newly attached to the eighth embodiment. Other configurations are the same as those in FIG.
[0050]
In the normal state, the change-over switch 22 is connected to the operating coil 23 side of the lockout relay 1, and when the operating coil 23 of the lockout relay is disconnected, the lockout relay is artificially operated by an operator or the like. Switching to the operating coil 24 side.
In the case of this embodiment as well, the reliability can be improved by attaching two operating coils as in the eighth embodiment.
[0051]
【The invention's effect】
As described above, according to the first aspect of the present invention, when the lockout relay malfunctions, the armature stopper is forcibly moved by operating the forcible operation drive rod so that the catch portion is locked. It can be canceled.
[0052]
According to the invention of claim 2, by adding an alarm device in parallel with the operating coil, it is possible to notify / warn the operator of the malfunction of the lockout relay.
[0053]
According to the third aspect of the invention, the heating wire is connected in parallel to the operating coil, and the contact material heated by the heating wire is formed into a shape memory alloy so that the coil of the lockout relay and the internal Even if the structure is defective, the contacts can be operated normally.
Moreover, according to the invention which concerns on Claim 4 and 5, it can make a coil back up by the remaining coil at the time of disconnection of a use side operation coil by carrying out multiple winding.
[0054]
Furthermore, according to the sixth and seventh aspects of the invention, since a plurality of operating coils are attached, it is possible to back up with the remaining coils when the operating coil is always disconnected.
[Brief description of the drawings]
FIG. 1 is an outline view and an internal detail view of a lockout relay according to a first embodiment of the present invention.
FIG. 2 is an outline view and an internal detail view of a lockout relay according to a second embodiment of the present invention.
FIG. 3 is a circuit diagram of a lockout relay according to a third embodiment of the present invention.
FIG. 4 is a circuit diagram of a lockout relay according to a fourth embodiment of the present invention.
FIG. 5 is an external view and a circuit diagram of a lockout relay contact according to a fifth embodiment of the present invention.
FIG. 6 is a schematic winding diagram of a lockout relay coil according to a sixth embodiment of the present invention.
FIG. 7 is a schematic view of a lockout relay coil winding and a changeover switch according to a seventh embodiment of the present invention.
FIG. 8 is a schematic winding diagram of a lockout relay coil according to an eighth embodiment of the present invention.
FIG. 9 is a schematic diagram of a winding of a lockout relay coil and a changeover switch according to a ninth embodiment of the present invention.
FIG. 10 is a circuit diagram of a conventional lockout relay.
FIG. 11 is an outline view and an internal detail view of a conventional lockout relay.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Lockout relay, 2, 3 ... Self-breaking contact, 4 ... Operating coil, 5 ... Breaker tripping contact, 6 ... Protective relay output contact, 7 ... Handle, 8 ... Front plate, 9 ... Shaft, 10 ... Catch part, 11 ... Operation spring, 12 ... Armature, 13 ... Iron core, 14 ... Stopper, 15 ... Back plate, 16 ... Roller, 17 ... Forced operation drive rod, 17-1 ... Knob part, 17-2 ... Operation end , 18 ... alarm device, 19 ... indicator, 20 ... heating wire, 21 ... contact, 22 ... changeover switch, 23, 24 ... operating coil.

Claims (7)

In a lockout relay in which the catch portion is mechanically locked by an armature driven by exciting an operating coil,
One end is arranged on the front plate side of the lockout relay as a knob part, and a forcible operation drive rod is arranged along the lockout relay with the other end arranged close to the armature, and the knob part is operated. Thus, the lockout relay is characterized in that the armature is forcibly moved to the operating position by the operating end to release the mechanically locked state of the catch portion. In a lockout relay that is activated when the protective relay contact is closed and connected to the operating coil so that the excitation current is cut off by the self-breaking contact after the operation,
A lockout relay, wherein an alarm device is connected in series with the protective relay contact and in parallel with the operating coil. In a lockout relay that is activated when the protective relay contact is closed and connected to the operating coil so that the excitation current is cut off by the self-breaking contact after the operation,
A heating wire connected in series with the protective relay contact and in parallel with the operating coil, and a contact that opens when it is not heated from the heating wire and changes its shape when heated by the heating wire and closes. A lockout relay characterized by comprising: In a lockout relay that is activated when the protective relay contact is closed and connected to the operating coil so that the excitation current is cut off by the self-breaking contact after the operation,
A lockout relay characterized in that the operating coil has multiple windings. 5. The lockout relay according to claim 4, further comprising switching means for selecting any one of the multiple wound operating coils. In a lockout relay that is activated when the protective relay contact is closed and connected to the operating coil so that the excitation current is cut off by the self-breaking contact after the operation,
A lockout relay comprising a plurality of the operating coils. 7. The lockout relay according to claim 6, further comprising switching means for selecting one of the plurality of operating coils.

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