JP7115188B2 - Systems for measuring surges, measuring systems with safety functions - Google Patents

Description

The present invention relates to a surge measurement system and a measurement system with a safety function.

For example, Patent Literature 1 discloses an insulating pedestal suitable for installing a high voltage test transformer.

JP-A-57-63460

By the way, the switching surge of a switch is measured by an operator of the switch opening and closing the switch, and another measurer measuring the switching surge caused by the opening and closing of the switch with a measuring device. At that time, in order to prevent the operator from receiving an electric shock due to the opening/closing surge, the operator must confirm that the operator is on the insulating pedestal before performing the opening/closing operation. However, the insulated frame disclosed in Patent Document 1 is not based on the premise that a measurer will ride on it to perform measurement work, and it is equipped with means for confirming whether or not a measurer is on the insulated frame. Therefore, this confirmation work must rely on visual observation by an operator or the like.

The main invention for solving the above-mentioned problems is a surge measurement system used when measuring a switching surge accompanying the switching operation of a circuit breaker in a substation with a measuring device, comprising: a horizontal table on which a measurer rides; an insulation member that electrically insulates the horizontal table from the ground; and a safety circuit that enables the measuring device to measure the switching surge only when the person to measure is on the horizontal table. And prepare.
Other features of the present invention will become apparent from the accompanying drawings and the description herein.

According to the present invention, the surge test of the switch can be performed in a state in which the safety of the operator is ensured, so that the operator can be prevented from receiving an electric shock.

1 is a configuration diagram of a measurement system with a safety function according to this embodiment; FIG. It is a figure showing a schematic structure of a measurement system with a safety function concerning this embodiment. It is a figure showing a schematic structure of a measurement system with a safety function concerning this embodiment. FIG. 3 is a diagram showing an outline of a state in which measurement cannot be started in the measurement system with a safety function according to this embodiment; FIG. 10 is a diagram showing a schematic configuration of a measurement system with a safety function according to another embodiment;

At least the following matters will become apparent from the description of the present specification and the accompanying drawings. In the following description, parts with the same reference numerals represent the same elements, and their basic configurations and operations are the same.

===Measuring system with safety function 1===
The measurement system 1 with a safety function is a system capable of preventing an operator 100 from receiving an electric shock when performing a switching surge test of a switch, for example.

The switching surge test is performed with the operator 100 standing on the insulating pedestal 21 . This is because if the measurement test is started without insulation protection of the measuring person 100 by the insulating frame 21, the measuring person 100 may receive an electric shock due to the opening/closing surge. That is, when the user 100 is not insulated and protected, as shown in FIG. A voltage difference between the two ground electrodes 410) is applied. Here, "V1" is a so-called reference voltage and indicates 0 V, and "V2" indicates a voltage generated by a switching surge. In addition to this voltage difference, the measurer 100 may also be impressed with a voltage difference (stride voltage) in the distance between both feet. For these reasons, if the operator 100 starts the measurement test without getting on the insulating pedestal 21, that is, without being electrically insulated and protected, there is a risk of being electrocuted by the surge voltage generated by the switching surge. . Therefore, in the measurement system 1 with a safety function according to the present embodiment, a safety function is added so that the measurement test can be started only when the operator 100 is reliably insulated and protected by the insulating frame 21 .

FIG. 1 is a configuration diagram of a measurement system 1 with a safety function. As shown in FIG. 1, a measurement system 1 with a safety function includes a measurement device 10 and a surge measurement system 20. As shown in FIG. Each component of the measurement system 1 with a safety function will be described below.

==Measuring Device 10==
The measuring device 10 is a device that measures the opening/closing surge based on the operator's 100 measurement start operation. The measuring device 10 is preferably a memory HiCorder, for example. Alternatively, instead of using the measurement start switch of the measurement device 10, the measurement may be started by inputting a low voltage signal to a predetermined channel. This allows the measurer 100 to press the measurement start switch at a position away from the measuring device 10, thereby improving operability. In this case, as shown in FIG. 1, a power cord 12 is connected to the channel, and a low-voltage power supply 13 is provided between the power cord 12 and the activation switch 11 operated by the subject 100 . As a result, when the measurement person 100 operates the start switch 11, the signal at the time of operation can be displayed on the measuring device 10. FIG. The measurement device 10 may be a sound detection device that detects sound generated by an opening/closing surge, a light detection device that detects light, or an electric field measurement device that measures electric field strength. may In other words, the measuring device 10 may be any device that detects a phenomenon caused by an opening/closing surge.

Note that the measuring device 10 may be a digital oscilloscope or an analog oscilloscope. In the case of a digital oscilloscope, any of DSO (digital storage oscilloscope), DPO (digital phosphor oscilloscope), MSO (mixed signal oscilloscope), and digital sampling oscilloscope may be used, and there is no particular limitation.

==Surge measurement system 20==
The surge measurement system 20 is a system having an interlock circuit so that the measuring person 100 can start the switching surge test only when the measuring person 100 is insulated and protected by the insulating frame 21 . As shown in FIG. 1, the surge measurement system 20 includes an insulating mount 21, a pressure sensor 22, a door sensor 23, and a safety circuit 24. As shown in FIG.

The insulating pedestal 21 is a pedestal for ensuring insulation between the measurer 100 and the ground. The insulating pedestal 21 includes, for example, a horizontal platform 21a on which the measurer 100 rides, and an insulating member 21b that electrically insulates between the horizontal platform 21a and the ground. The horizontal table 21a may have any size, for example, for the measurer 100 to perform the measurement work, and its plan view shape is not limited. Further, although the material of the horizontal base 21a is not particularly limited, it is made of wood or plastic, for example. The insulating members 21b are columnar insulators, for example, and are provided at the four corners of the horizontal base 21a. Also, the insulating member 21b may be an insulating material such as a rubber material that is attached in the form of a sheet to the surface of the horizontal base 21a facing the ground. In other words, the insulating member 21b only needs to have a function of electrically insulating the horizontal base 21a from the ground.

The pressure sensor 22 is a sensor that is provided at a predetermined position on the insulating pedestal 21 and detects the weight of the measurer 100 . The predetermined position is provided, for example, in the central portion of the insulating frame 21 as shown in FIG. Pressure sensor 22, for example, generates an electrical signal responsive to the magnitude of the sensed pressure. As indicated by the dashed lines in FIG. 1, pressure sensor 22 transmits an electrical signal to safety circuit 24, either by wire or wirelessly. The pressure sensor 22 is, for example, a semiconductor piezoresistive diffusion pressure sensor, a capacitive pressure sensor, or the like, but is not particularly limited. The type of pressure measured by the pressure sensor 22 is, for example, absolute pressure, gauge pressure, or differential pressure, but is not particularly limited.

The door sensor 23 is a pair of sensors provided on the fixed side of the safety fence 200 and on the side of the moving door 210, respectively. The door sensor 23 detects the closed state of the door 210 by one sensor facing or coming into contact with the other sensor when the door 210 is closed. The door sensor 23 may be of a non-contact type or a contact type, and its type is determined according to the type of the door 210, such as a hinged door, a sliding door, or a folding door. As indicated by the dashed line in FIG. 1, the door sensor 23 transmits an electrical signal indicating the closed state of the door 210 to the safety circuit 24 by wire or wirelessly when the door 210 is closed.

The safety circuit 24 is a circuit device that operates so that the measurer 100 can start the surge test only when both the electrical signals output from the pressure sensor 22 and the door sensor 23 are received. 2 and 3 are diagrams showing a schematic configuration of the measurement system 1 with a safety function. The configuration of the safety circuit 24 and the operation of the surge measurement system 20 will be described with reference to FIGS. 2 and 3. FIG.

As shown in FIG. 2, safety circuit 24 receives electrical signals from pressure sensor 22 and door sensor 23 . As shown in FIG. 3, when the safety circuit 24 receives an electrical signal from the pressure sensor 22, the first switch 24a transitions from the open state to the closed state. Further, when the safety circuit 24 receives an electrical signal from the door sensor 23, the second switch 24b provided in series with the first switch 24a shifts from the open state to the closed state. When the control signal is output from the measuring device 10 while the first switch 24a and the second switch 24b are closed, the control signal is transmitted through the safety circuit 24 to the control switch of the control circuit 310 of the circuit breaker 300. By acting on 311, circuit breaker 300 operates.

On the other hand, as shown in FIG. 4, the door 210 is open when the subject 100 is outside the safety fence 200 . Therefore, since one side and the other side of the pair of door sensors 23 do not face each other, the door sensor 23 does not detect the closed state. Moreover, since the person to be measured 100 is not on the insulating base 21, the pressure sensor 22 does not output an electrical signal. Therefore, since the first switch 24a and the second switch 24b of the safety circuit 24 do not shift from the open state to the closed state, even if the measurer 100 presses the start switch 11 of the measuring device 10 in this state, the circuit breaker 300 does not work.

In addition, when the measurer 100 closes the door 210 from the inside of the safety fence 200 and an electrical signal is output from the door sensor 23, and the measurer 100 is not on the insulating pedestal 21, the safety circuit 24 Since the first switch 24a does not shift to the closed state, the circuit breaker 300 does not operate even if the measuring person 100 presses the start switch 11 of the measuring device 10. FIG. Thereby, the subject 100 can be prevented from being electrocuted. Similarly, even if the measurer 100 is on the insulating frame 21 and the door 210 of the safety fence 200 is not closed, even if the measurer 100 presses the start switch 11 of the measuring device 10, , the circuit breaker 300 does not operate. As a result, since the measurement is performed in a state in which the safety of the measurer 100 is ensured, the electric shock of the measurer 100 can be reliably prevented.

In this way, a state in which the subject 100 is not on the insulating pedestal 21 and a state in which the door 210 of the safety fence 200 is not closed, that is, the electrical insulation of the subject 100 is ensured safely and reliably. In this state, the circuit breaker 300 does not operate even if the measurer 100 presses the start switch 11 of the measuring device 10 . The safety circuit 24 is configured by a circuit configured by a contact relay or a programmable logic controller, and its hardware configuration is not limited.

Although the surge measurement system 20 has been described as including the pressure sensor 22 and the door sensor 23, it is not limited to this. At least one of the pressure sensor 22 and the door sensor 23 may be included.

Further, although the safety circuit 24 is configured by connecting the first switch 24a and the second switch 24b in series, it is not limited to this. The safety circuit 24 may be configured by connecting a first switch 24a and a second switch 24b in parallel. In this case, when the safety circuit 24 receives an electrical signal from at least one of the pressure sensor 22 and the door sensor 23 , the control signal output from the measuring device 10 is transmitted through the safety circuit 24 to the control circuit 310 of the circuit breaker 300 . It is arranged to act on the control switch 311 .

===Measurement system 2 with safety function in another embodiment===
FIG. 5 is a diagram showing a schematic configuration of a measurement system 2 with a safety function according to another embodiment. As shown in FIG. 5, the measurement system 2 with a safety function is a system obtained by adding a communication device 30 including a transmitter 31 and a receiver 32 to the measurement system 1 with a safety function. Therefore, in the measurement system 2 with a safety function according to another embodiment, the parts denoted by the same reference numerals as those in the measurement system 1 with a safety function shown in FIG. 1 represent the same elements, and the description thereof will be omitted. The measurement system 2 with a safety function is used, for example, in a measurement situation in which the point to be measured and the point where the circuit breaker 300 that causes switching surges is installed are significantly apart.

In the measuring system 2 with a safety function, the control signal output from the measuring device 10 is output to the transmitting device 31 through the safety circuit 24 that receives electrical signals from the pressure sensor 22 and the door sensor 23 . The transmitter 31 transmits the control signal to the receiver 32 , and the receiver 32 that has received the control signal outputs the control signal to the control circuit 310 of the circuit breaker 300 . The circuit breaker 300 is operated by the control signal acting on the control switch 311 . As a result, electric shock to the measurer 100 can be prevented even in the opening/closing test of the circuit breaker 300 located remotely.

===Summary===
The surge measurement system 20 in the present embodiment is a surge measurement system 20 used when measuring the switching surge accompanying the switching operation of the circuit breaker 300 of a substation with the measuring device 10. Insulating frame 21 having flat base 21a and insulating member 21b for electrically insulating horizontal base 21a from the ground, measuring device 10 detects switching surge only when measuring person 100 is on horizontal base 21a. and a safety circuit 24 that allows the measurement at . According to this embodiment, the surge test of the switch can be performed in a state in which the safety of the operator 100 is ensured, so that the operator 100 can be prevented from receiving an electric shock.

In addition, the surge measurement system 20 according to the present embodiment includes a pressure sensor 22 that is provided on the insulating pedestal 21 and detects the weight of the measurer 100 on the horizontal stand 21a, and a safety fence 200 that surrounds the insulating pedestal 21. a door sensor 23 provided on a door 210 through which the person 100 enters and exits to detect that the door 210 is closed; or detection of pressure by the pressure sensor 22, the measuring device 10 can measure the switching surge. According to this embodiment, the switching surge test can be safely performed in a state in which the operator 100 is insulated from the ground.

Moreover, the insulating member 21b of the insulating pedestal 21 of the surge measuring system 20 in this embodiment is a columnar insulator. According to this embodiment, since a general-purpose insulating material can be used, the manufacturing cost can be reduced.

In addition, the measurement system 2 with a safety function according to the present embodiment is triggered by the fact that the operator 100 is on the horizontal table 21a. A transmitting device 31 that receives through the safety circuit 24 and transmits a start signal, and a receiving device 32 that receives the start signal from the transmitting device 31 and activates a predetermined switch for enabling the measurement device 10 to measure the switching surge. , is further provided. According to this embodiment, the remote opening/closing surge test can be performed while ensuring the safety of the measurement person 100 .

Moreover, the measurement system 1 with a safety function according to the present embodiment includes a surge measurement system 20 and a measurement device 10 that measures a switching surge. According to this embodiment, versatility can be enhanced by providing a system including a device for measurement.

Moreover, the measuring device 10 of the measuring system 1 with a safety function in this embodiment has a start switch 11 extended by an electric wire. According to the present embodiment, even if the measurement device 10 is placed at a position that the measurement person 100 cannot reach directly, the measurement person 100 can operate the measurement device 10 while standing on the insulating pedestal 21. A switching surge test can be safely performed.

Moreover, the measuring device 10 of the measuring system 1 with a safety function in this embodiment is a memory high coder. According to this embodiment, there are many kinds of objects to be measured, and it can be applied to detection other than opening/closing surges.

Moreover, the measuring device 10 of the measuring system 1 with a safety function in this embodiment is a digital oscilloscope. According to the present embodiment, since digital oscilloscopes are available in many types and have high versatility, the design cost can be reduced.

The above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit and interpret the present invention. The present invention may be modified and improved without departing from its spirit, and the present invention also includes equivalents thereof.

1 Measuring system with safety function 10 Measuring device 11 Starting switch 12 Power cord 20 Surge measuring system 21 Insulating base 21a Horizontal base 21b Insulating member 22 Pressure sensor 23 Door sensor 24 Safety circuit 24a First switch 24b Second switch 31 Transmitter 32 Receiving device 100 Measurer 200 Safety fence 210 Door

Claims (10)

A surge measurement system used when measuring a switching surge associated with the switching operation of a circuit breaker in a substation with a measuring device,
an insulating pedestal having a horizontal platform on which a person to be measured rides, and an insulating member for electrically insulating the horizontal platform from the ground;
a safety circuit that enables the measuring device to measure the opening/closing surge only when the measuring person is on the horizontal table;
A surge measurement system comprising: further comprising a pressure sensor provided on the insulating pedestal for detecting the weight of the measurer present on the horizontal base,
The surge measurement system according to claim 1, wherein the safety circuit enables the measurement device to measure the opening/closing surge when the pressure sensor detects pressure. further comprising a door sensor provided on a door for the measuring person to enter and exit in the safety fence surrounding the insulating pedestal and detecting that the door is closed;
The surge measurement system according to claim 1, wherein the safety circuit enables the measurement device to measure the opening/closing surge when the door sensor detects the closed state of the door. a pressure sensor provided on the insulating pedestal for detecting the weight of a measurer present on the horizontal base;
a door sensor provided on a door for the measurer to enter and leave the safety fence surrounding the insulating pedestal and detecting that the door is closed;
further comprising
Triggered by the door sensor detecting the closed state of the door and the pressure sensor detecting pressure, the safety circuit enables the measuring device to measure the opening/closing surge. Item 1. The surge measurement system according to Item 1 The surge measurement system according to any one of claims 1 to 4, wherein the insulating member is a columnar insulator. A transmission device that receives a start signal through the safety circuit and transmits the start signal for enabling the measuring device to measure the opening and closing surge of the circuit breaker, triggered by the presence of the measurer on the horizontal table. When,
a receiving device that receives the start signal from the transmitting device and activates a predetermined switch for enabling the measuring device to measure the switching surge;
The system for measuring surge according to any one of claims 1 to 5, further comprising: a surge measurement system according to any one of claims 1 to 6;
a measuring device for measuring the switching surge;
A measurement system with a safety function, characterized by comprising 8. The measuring system with safety function according to claim 7, wherein the measuring device has an activation switch extended by a wire. 9. The measuring system with a safety function according to claim 7, wherein the measuring device is a Memory HiCorder. The measurement system with a safety function according to claim 7 or 8, wherein the measurement device is a digital oscilloscope.

Images