JP6437304B2 - Switching terminal block and method for measuring insulation resistance using the same or method for switching a relay drive circuit using the same - Google Patents

Description

  The present invention is provided with a terminal block arranged on a switchboard or the like of a power device, and is capable of easily turning on and off a grounding wire at the time of measuring an insulation resistance, and an insulation resistance measuring method using the same The present invention relates to a method for opening and closing a used relay drive circuit.

  In the conventional inspection work of electric power equipment, when measuring insulation resistance, it is necessary to attach and detach a ground wire or the like. In this case, if the ground wire or the like is via the terminal block, it is easy to attach and detach, but sometimes the disconnected ground wire or the like is erroneously connected or an unconnected human error occurs. In particular, when the ground wire is connected to the actual system without being connected, there is a risk that a high potential is generated, causing equipment damage or an electric shock disaster.

  The case where these disasters and equipment damages occur is when the instrument transformer (PD) is inspected. This is because there are many detachable wires for measuring insulation resistance because the detachable portion is not a terminal block but a portion in the middle of wiring. Thus, when measuring the insulation resistance of a transformer (PD), etc., it is necessary to disconnect a plurality of ground wires at one place in the box of the main body. After measuring the insulation resistance, Since one of the wires may be hidden behind the insulation board, etc., there is a possibility of forgetting restoration. (1) Display and attach to each line before attaching / detaching. (2) Wiring the attaching / detaching points to the terminal block. Although (1) is difficult to judge whether the attachment / detachment location is appropriate, (2) may largely prevent human error. Since the attachment and detachment itself is a cause of human error, the problem itself is not a complete solution.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2011-257249) has a problem that it takes considerable labor and time for confirmation when there are a plurality of cables to be measured for insulation resistance using a test terminal and a megar. In order to solve this problem, there is a problem that there is a possibility of removing the grounding wire due to misidentification when removing the grounding wire at the terminal block where multiple cables are mixed. A test terminal is disclosed. This test terminal is connected to the test terminal main body, and the test terminal plug side is equipped with a mechanism for switching the connection of the ground wire, so that it is grounded at the terminal block where multiple cables are mixed. Even when the wire is removed, the ground wire being charged is not removed due to misidentification.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2014-109561) discloses an insulation resistance measurement device that prevents a large short-circuit current from occurring during measurement of insulation resistance of various devices and automates insulation resistance measurement. In the embodiment disclosed herein, when another insulation panel is connected to the solar panel to be measured at the time of measurement of insulation resistance, the insulation resistance measurement device automatically measures. It is disclosed that the measurement of insulation resistance can be performed safely and easily because the output is impossible, and according to this embodiment, there is no need to install an insulation resistance measuring device according to the measurement frequency, and insulation resistance measurement is possible. It is disclosed that the measurement method using the apparatus is excellent in portability and advantageous in cost.

  Patent Document 3 (Japanese Patent Laid-Open No. 6-84670) discloses a grounding-type instrument that eliminates the need to remove and attach a grounding wire for grounding a grounding terminal of a transformer for grounding-type instrument when measuring the insulation resistance of a high-voltage path. A transformer for electric power is provided. The problem disclosed in Patent Document 3 is that when measuring the insulation resistance of an electric circuit, the work is performed in advance by removing the ground wire connecting the ground terminal to the ground. Installation work to connect to the grounding terminal will be done, but there is a problem that there is no possibility of shifting to the operating state at the upper end where the grounding terminal of the high voltage winding is not grounded, forgetting the connection work of the grounding wire In other words, it is disclosed that there is a problem in that the efficiency of the measurement work is poor because the ground wire is removed and attached before and after the insulation resistance measurement work of the electric circuit.

  In Patent Document 4 (Japanese Patent Application Laid-Open No. 8-184636), insulation of electric power equipment such as an electric motor may deteriorate over time, which may lead to a serious accident such as shutdown and fire. Disclosed that insulation diagnosis needs to be performed periodically. As an example of measuring insulation resistance of power equipment, disconnect the lead wire of the power equipment from the cable, and then connect one of the lead wires of the insulation resistance meter to the lead wire. It is disclosed that the insulation resistance value is read from the scale of the insulation resistance meter after connecting all at once and connecting the other to the ground. For this reason, in the insulation diagnosis of power equipment, in addition to the measurement work, work to disconnect the cable connection and work to restore the connection after the measurement occur, and after the cable connection, check the normal operation of the power equipment It is disclosed that action is required. For this reason, in this patent document 4, the insulation diagnostic method which can perform electric power apparatus diagnosis fully automatically is disclosed.

JP 2011-257249 A JP 2014-109561 A JP-A-6-84670 JP-A-8-184636

  As disclosed in the above-mentioned patent document, in the inspection work of electric power equipment performed for safety, it is necessary to attach and detach the ground wire in the insulation resistance measurement. In this case, if the bonding wire is via the terminal block, it is easy to attach and detach, but sometimes a problem such as the occurrence of a human error in which the disconnected ground wire is misconnected or left unconnected occurs. ing. In particular, when the ground wire is connected to the actual system in the unconnected state, there is a risk that a high potential is derived and equipment damage or an electric shock disaster occurs. The case where these disasters and equipment damages occur is when the instrument transformer (PD) is inspected. This is because there are many detachable wires for insulation resistance measurement, and the detachable location is not a terminal block but a location in the middle of wiring.

  For this reason, although the invention disclosed by the patent document mentioned above etc. is proposed, it has the problem that the apparatus itself is large in order to install the measuring apparatus itself with respect to the insulation resistance measurement frequency. Furthermore, when the insulation resistance device itself is large, there is a problem that the cost increases.

  From the above, the present invention can be installed as it is in the vicinity of the terminal block of the power equipment, and the detachable wires necessary for measuring the insulation resistance can be gathered, and the switch mechanism is further provided to cut off the ground wire. And an open / close terminal block that can display the interruption by a switch, thereby reliably preventing a human error with a simple configuration.

  Furthermore, this invention provides the insulation resistance measuring method of electric power equipment which uses the switch terminal block which concerns on this invention.

  Furthermore, the present invention provides a method for measuring an insulation resistance of a CT circuit or a method for opening and closing a relay drive circuit using the switching terminal block according to the present invention.

  The open / close terminal block according to the present invention includes a terminal block body, first and second terminals disposed on one side of the terminal block body, and third and fourth terminals disposed on the other side of the terminal block body. , A fifth path, a sixth path, a first path connecting between the first terminal and the third terminal, a second path connecting between the second terminal and the sixth terminal, A third path connecting between the fourth terminal and the fifth terminal; a first switch disposed on the first path; for opening and closing the first path; and on the second path A second switch that opens and closes the second path, a third switch that is disposed on the third path and opens and closes the third path, and the first, second, and third switches. A switch mechanism that is connected and operated, and closes the third switch at the same time that the first and second switches are opened, and is disposed in the third path. Those having a light emitting means for emitting light when the third path is closed.

  Further, it is desirable that the open / close terminal block constitutes a part of a terminal block terminal installed in the switchboard.

  Furthermore, the method for measuring the insulation resistance of a power device according to the present invention is the above-described open / close terminal block installed at a predetermined position, wherein the first terminal is attached / detached at the time of inspection of the power device subject to insulation resistance measurement. Is connected to the second terminal of the open / close terminal block, and a power supply connecting line that needs to be attached or detached at the time of inspection is connected to the third terminal and the sixth terminal. The positive terminal of the DC power supply is connected to the fourth terminal of the open / close terminal block, the fifth terminal can be used as an output terminal, and the first and second paths are routed by the switch mechanism when measuring insulation resistance. At the same time, the third path is turned on to cause the light emitting means to emit light, indicating that the first and second paths are cut off, and when the light emitting means emits light, an ohmmeter is connected to the first terminal And measure the insulation resistance between the first terminal and ground. In addition, a resistance meter is connected to the second terminal and the insulation resistance between the second terminal and the ground is measured, and the insulation resistance between the power equipment and the ground and the insulation resistance between the power supply line and the ground are measured. Then, after measuring the insulation resistance, the first and second paths are restored by the switch mechanism, and at the same time, the third path is blocked to stop the light emission of the light emitting means.

  The switch mechanism is preferably a slide switch including two a contact switches and one b contact switch. In this case, the first and second switches are a-contact switches, and the third switch is a b-contact switch. The light emitting means is preferably an LED.

  As a result, when measuring the insulation resistance of a power device, the first path and the second path are simultaneously cut off and the third path is made conductive by the switch mechanism, so that it is easy to remove the conventional wiring. In addition, since the fact that the ground line is interrupted can be displayed by causing the light emitting means to emit light, the insulation resistance measurement can be performed without error by confirming this display and performing the insulation resistance measurement.

  In addition, after the insulation resistance measurement, the first path and the second path are simultaneously returned by the switch mechanism and the third path is shut off, so that the recovery after the end of the work is facilitated.

  Furthermore, the present invention is the switching terminal block according to claim 1 or 2 installed at a predetermined position, wherein one wiring of one current transformer to be measured for insulation resistance is connected to the first terminal. In addition, one wiring of another current transformer subject to insulation resistance measurement is connected to the second terminal, and the third terminal and the sixth terminal are connected to normal wiring of each current transformer. Connected to the ground wire, the positive terminal of the DC power supply is connected to the fourth terminal of the open / close terminal block, and the fifth terminal can be used as an output terminal. And the second path is cut off, and at the same time, the third path is turned on to cause the light emitting means to emit light to indicate that the first and second paths are cut off, and the first light emitting means emits light when the light emitting means emits light. Connect an ohmmeter to the terminal to provide insulation resistance between the first terminal and ground. In addition, connect an ohmmeter to the second terminal, measure the insulation resistance between the second terminal and ground, and determine the insulation resistance between the power equipment and the ground and the insulation resistance between the power supply line and the ground. After the measurement and the insulation resistance measurement, the first and second paths are restored by the switch mechanism, and at the same time, the third path is cut off to stop the light emission of the light emitting means. To do.

  As a result, the opening and closing of the ground wires of the two current transformers (CT) circuits can be executed by one switching terminal block, so that the insulation resistance measurement of each current transformer can be easily performed. is there.

  Furthermore, the present invention provides the first path of the switching terminal block according to claim 1 or 2 in the vicinity of the timer relay of the relay driving circuit in a relay driving circuit in which disconnection of the timer relay in the relay device may be required. Alternatively, the present invention provides a method for opening and closing a relay drive circuit, characterized in that a third path is connected.

  Thus, the open / close terminal block according to the present invention can be used in a relay drive circuit or the like where the circuit needs to be opened or closed.

  As described above, according to the present invention, the open / close terminal block according to the present invention is installed in the vicinity of the terminal block terminal of the switchboard, and the grounding wire that needs to be interrupted when measuring the insulation resistance when wiring to the terminal block terminal. By wiring through the open / close terminal block, when measuring insulation resistance, for example, by simply moving the slide switch, the ground wire can be interrupted and at the same time the ground wire interrupt can be displayed. The measurement can be carried out reliably and easily. In addition, after the insulation resistance measurement is completed, it can be recovered simply by returning the slide switch to the original state, so that human errors such as connection errors can be prevented. In addition, a serious accident can be prevented by eliminating human error.

(A) is the schematic explanatory drawing which showed the switching terminal block of this invention, (b) is the circuit diagram of the inside. It is a circuit diagram of the normal state of the switching terminal block of this invention. It is a circuit diagram at the time of the insulation resistance measurement of the switching terminal block of this invention. (A) is a circuit diagram of the normal state at the time of using the switching terminal block of this invention for a current transformer circuit, (b) is a circuit diagram at the time of an insulation resistance measurement. It is a circuit diagram of the normal state at the time of using the switching terminal block of this invention for a relay drive circuit, (b) is the circuit diagram which showed the state which interrupted | blocked the timer relay.

  Embodiments of the present invention will be described below with reference to the drawings.

  The open / close terminal block 1 according to the present invention includes a terminal block main body 2 and first and second terminals arranged on one side 2a of the terminal block main body 2 as shown in FIGS. A, B, third, fourth, fifth and sixth terminals C, D, E, F arranged on the other side 2b of the terminal block body 2, first terminal A and third terminal The first path 3 connecting between the C, the second path 4 connecting between the second terminal B and the sixth terminal F, and between the fourth terminal D and the fifth terminal E. A third path 5 to be connected, a first switch SW1 disposed on the first path 3 to open and close the first path 3, and a second path 4 disposed on the second path 4. 4, a second switch SW <b> 2 that opens and closes 4, a third switch SW <b> 3 that is disposed on the third path 5 and opens and closes the third path 5, and the first, second, and third switches SW <b> 1 and SW <b> 2. SW3 is connected and operated, and the first and second switches SW1 and SW2 are opened, and the third switch SW3 is closed at the same time, and the third path 5 is disposed in the third path 5. And a light emitting diode LED which emits light when 5 is closed.

  Further, the terminal block body 2 is provided with a display portion 8 that emits light by light emission of the light emitting diode LED, and the switch mechanism 6 is preferably a slide switch, and is slidably switched on the terminal block body 2. A knob 6a is provided. The first and second switches SW1, SW2 are a-contact switches, and the third switch SW3 is a b-contact switch, which moves together with the switch knob 6a.

  Further, it is desirable that the third path 5 to which the positive side of the DC power source is connected from the fourth terminal D is provided with a protection diode 7 and a protection resistor R for preventing backflow. The fifth terminal E, which is the output terminal of the third path 5, is connected to a remote monitoring system (not shown) or the like and can be used for remote monitoring by the centralized management system.

  Example 1 shows an example in which the switching terminal block 1 having the above-described configuration is used for measuring the insulation resistance of an instrument transformer. In the first embodiment, the open / close terminal block 1 having the above-described configuration is desirably disposed in the vicinity of the terminal block terminal in the switchboard outer case of the instrument transformer.

  2 and 3, the ground wire 20 from the outer case is connected to the first terminal A when wiring the outer case of the instrument transformer. Similarly, the power supply ground wire 30 is connected to the second terminal B. Further, the third terminal C and the sixth terminal F are connected and further connected to the ground wire 40 and grounded. Further, a direct current plus power source (DC +) 50 is connected to the fourth terminal D, and a wiring 60 to a remote monitoring system (not shown) is connected to the fifth terminal E.

  Thus, when measuring the insulation resistance of the instrument transformer, the slide switch 6 is moved to shift from the normal state shown in FIG. 2 to the insulation resistance measurement state shown in FIG.

  In the state shown in FIG. 2, the first path 3 is turned on by the first switch SW1, and at the same time, the second path 4 is turned on by the second switch SW2, and the third path SW3 is turned on by the third switch SW3. Path 5 is blocked. As a result, the outer case of the instrument transformer and the power supply ground wire are grounded as usual.

  Further, when measuring the insulation resistance of the instrument transformer, the slide switch 6 is moved to open the first switch SW1 to cut off the first path 3 as shown in FIG. The switch SW2 is opened to shut off the second path 4, and the third switch SW3 is closed to make the third path 5 conductive.

  As a result, the normal ground wires 20 and 30 can be easily cut off by the movement of the slide switch 6 (ON → OFF). Moreover, since the 3rd path | route 5 will be in a conduction | electrical_connection state, light emitting diode LED light-emits, the display part 8 lights, and it can confirm that the earth wires 20 and 30 were interrupted | blocked. Then, after confirming that the display unit 8 is lit, an insulation resistance meter (Megger) 100 is connected to the first terminal A, and the insulation resistance between the outer case and the ground is measured. Also, an insulation resistance meter (Megger) 100 is connected to the second terminal B to measure the insulation resistance between the earth line of the power source and the ground. After the measurement of the insulation resistance is completed, the slide switch 6 is moved (OFF → ON) to return to the normal ground state (conducting state between the ground wires 20 and 30 and the ground wire 40).

  From the above, according to the present invention, since the ground wire can be opened and closed simply by turning on and off the slide switch 6, it is possible to easily measure the insulation resistance, and this has conventionally occurred in the insulation work. It can prevent human error.

  As shown in FIGS. 4A and 4B, the second embodiment of the present invention uses the switching terminal block 1 according to the present invention to measure the insulation resistance of the current transformer (CT) circuits 200A and 200B. It is a thing. In the second embodiment, the switching terminal block 1 according to the present invention is preferably provided in a terminal block terminal (not shown), and the first wiring of the switching terminal block 1 according to the present invention is connected to the wiring 201A on the ground side of the CT circuit 200A. The first terminal A and the third terminal C are connected in the middle of the wiring 201A so that the path 3 is arranged, and similarly, the switching terminal block according to the present invention is connected to the grounding wiring 201B of the CT circuit 200B. The second terminal B and the sixth terminal F are connected in the middle of the wiring 201B so that the first second path 5 is arranged, and the third terminal C and the sixth terminal F are connected to the ground wire. 40 is connected to ground.

  With the above configuration, by moving the slide switch 6 (ON → OFF), as shown in FIG. 4B, the ground side of the two CT circuits 200A and 200B can be shut off by one switching terminal block 1. The insulation resistance measurement of the two CT circuits 200A and 200B can be continuously performed. Further, the interruption of the power supply ground wires 201A and 201B of the CT circuits 200A and 200B can be confirmed on the display unit 8 when the light emitting diode LED emits light.

  As shown in FIGS. 5A and 5B, the third embodiment of the present invention is an open / close terminal block according to the present invention for opening and closing the relay control circuits 301A and 301B of the circuit breaker (CB) devices 300A and 300B. 1 is used. Some relay control circuits 301A and 301B are required to temporarily remove TT1 and TT2 in the relays Ry1 and Ry2. In such a case, the relay control circuits 301A and 301B can be shut off when necessary by using the switching terminal block 1 according to the present invention.

Also in the third embodiment, by moving the slide switch 6 (ON → OFF), as shown in FIG. 5B, the two relay control circuits 301A and 301B can be opened and closed by one opening / closing terminal block 1. The two relay control circuits 301A and 301B can be shut off when necessary. Moreover, the interruption | blocking of each relay control circuit 301A, 301B can be confirmed in the display part 8 when light emitting diode LED light-emits.

  As described above, by providing the open / close terminal block 1 of the present invention in the vicinity of the terminal block terminal inside the switchboard or the like, for example, the attachment / detachment of the earth line required for measuring the insulation resistance, and other relay control circuits are required. It is possible to easily perform opening and closing, and it is possible to easily prevent human error that may occur during these operations.

DESCRIPTION OF SYMBOLS 1 Opening / closing terminal block 2 Terminal block main body 2a One side of a terminal block main body 2b The other side of a terminal block main body 3 1st path | route 4 2nd path | route 5 3rd path | route 6 Switch mechanism (slide switch)
7 Protection diode 8 Display unit 20 Ground wire from outer box 30 Power supply ground wire 40 Ground wire 200A, 200B Current transformer circuit 300A, 300B Circuit breaker A First terminal B Second terminal C Third terminal D Second 4 terminal E 5th terminal F 6th terminal R protection resistance SW1 1st switch SW2 2nd switch SW3 3rd switch

Claims (5)

A terminal block body;
First and second terminals disposed on one side of the terminal block body;
Third, fourth, fifth and sixth terminals disposed on the other side of the terminal block body;
A first path connecting between the first terminal and the third terminal;
A second path connecting between the second terminal and the sixth terminal;
A third path connecting between the fourth terminal and the fifth terminal;
A first switch disposed on the first path and opening and closing the first path;
A second switch disposed on the second path and opening and closing the second path;
A third switch disposed on the third path for opening and closing the third path;
A switch mechanism that connects and operates the first, second, and third switches, and simultaneously closes the third switch when the first and second switches are opened;
An opening / closing terminal block, comprising: a light emitting means disposed on the third path and emitting light when the third path is closed.   2. The switch terminal block according to claim 1, wherein the switch terminal block constitutes a part of a terminal block terminal installed in a switchboard. The switching terminal block according to claim 1 or 2, wherein the first terminal is connected to a ground wire that needs to be attached / detached at the time of inspection of a power device to be measured for insulation resistance, The second terminal of the switching terminal block is connected to a power supply power supply line that needs to be attached and detached at the time of inspection, the third terminal and the sixth terminal are connected to the ground wire, and the fourth terminal of the switching terminal block Is connected to the positive side of the DC power supply and the fifth terminal can be used as an output
When the insulation resistance is measured, the first and second paths are blocked by the switch mechanism, and at the same time, the third path is turned on to cause the light emitting means to emit light and display that the first and second paths are blocked. When the light emitting means emits light, a resistance meter is connected to the first terminal to measure the insulation resistance between the first terminal and the ground, and the resistance terminal is connected to the second terminal to Measure the insulation resistance between the ground, measure the insulation resistance between the power equipment and the ground, and the insulation resistance between the power supply line and the ground. After measuring the insulation resistance, the switch mechanism is used to switch the first and second paths. A method for measuring insulation resistance characterized by stopping the light emission of the light-emitting means by simultaneously interrupting the third path. The switching terminal block according to claim 1 or 2, wherein one wiring of one current transformer to be measured for insulation resistance is connected to the first terminal, and the insulation resistance measurement is performed. One wiring of another target current transformer is connected to the second terminal, and the third terminal and the sixth terminal are connected to the normal wiring of each current transformer and connected to the ground wire And the positive terminal of the DC power source is connected to the fourth terminal of the open / close terminal block, and the fifth terminal can be used as an output terminal,
When the insulation resistance is measured, the first and second paths are blocked by the switch mechanism, and at the same time, the third path is turned on to cause the light emitting means to emit light and display that the first and second paths are blocked. When the light emitting means emits light, a resistance meter is connected to the first terminal to measure the insulation resistance between the first terminal and the ground, and the resistance terminal is connected to the second terminal to Measure the insulation resistance between the ground, measure the insulation resistance between the power equipment and the ground, and the insulation resistance between the power supply line and the ground. After measuring the insulation resistance, the switch mechanism is used to switch the first and second paths. A method for measuring insulation resistance characterized by stopping the light emission of the light-emitting means by simultaneously interrupting the third path. In the relay drive circuit where the disconnection of the timer relay inside the relay device may be required,
A method for opening and closing a relay driving circuit, wherein the first path or the third path of the switching terminal block according to claim 1 or 2 is connected in the vicinity of a timer relay of the relay driving circuit.

Images