JPH09147655A - Operation characteristic measurement device for switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mount sensors to detect the moving range of a contact for a switch and prevent noise in measurement. SOLUTION: The moving range of a main circuit contact 24 for a breaker 17 is detected by a rotary encoder 15. Then, in accordance with the output pulse of various sensors 13, 14 and the rotary encoder 15, various operation properties of a switch 31 are automatically calculated by a CPU 3. The rotary encoder 15 is used to prevent noise in measurement. The rotary encoder 15 has the rotation part fixed to the main shaft 25 of an operator and the fixed part fixed to a box for the switch 31 by a flexible arm and a magnet. In this mounting method, it is not necessary to align the main shaft 25 of the operator to the sensors 13, 14.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a circuit breaker, a switch,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for measuring operating characteristics of a switch such as a disconnector, and more particularly to a device for measuring operating characteristics of a switch that detects a movement amount of a contact of the switch as time series data.

[0002]

2. Description of the Related Art A switch has its operating characteristics measured at the time of manufacture, at the time of periodic inspection, or at every operation of the switch to ensure reliability. The measurement items include the initial opening speed, the average speed, the operating time, and the current value. When measuring these items, it is necessary to measure the amount of contact movement, the current value of the main circuit, and the open / closed state of the main circuit in time series.

Therefore, in order to detect the contact movement amount, a potentiometer or a sliding resistance has been attached to the rotary shaft of the operating mechanism of the switch. According to this, the resistance value of the potentiometer changes according to the rotation of the rotary shaft of the operating mechanism, and the output thereof is recorded in time series by a thermal recorder or the like. Then, the movement amount of the contact is calculated based on the measured waveform.

[0004]

When the potentiometer or the like is attached to the rotary shaft of the operating mechanism of the switch as in the prior art described above, it is measured that the rotary shaft operates at high speed and high torque. This causes problems such as noise and damage to the potentiometer.

That is, when the potentiometer rotates at high speed, a moment when the sliding contact leaves the resistor occurs, which causes measurement noise. Further, if the rotary shaft of the operation mechanism and the shaft of the potentiometer are misaligned, the bearing or coupling of the potentiometer may be damaged if the rotary shaft rotates at high speed and high torque even if the amount of misalignment is minute. .

For this reason, in the conventional device, the rotary shaft of the operating mechanism and the core of the potentiometer must be completely adjusted and attached. Further, in the conventional device, since the mounting position of the potentiometer and the like and the operation stroke of the switch differ depending on the switch, it is necessary to manually convert the measurement waveform obtained from the potentiometer into the stroke length of the switch. It was For this reason, it takes time and an error occurs depending on the person who performs the measurement.

Furthermore, since it is necessary to attach a device such as a potentiometer necessary for measurement at the time of measurement, the measurement at the site becomes very large. The present invention, in the operating characteristic measuring device of the switch, a sensor for detecting the movement amount of the contact of the switch can be easily attached,
In addition, the purpose is to prevent measurement noise from occurring.

It is another object of the present invention to make it possible to automatically calculate each measurement item in a switch operating characteristic measuring device.

[0009]

In order to achieve the above object, the present invention provides a switch operating characteristic measuring device for detecting the amount of contact movement of a switch as time series data.
It is a rotary encoder that has a fixed part and a rotating part, and outputs the rotation amount of the rotating part with respect to the fixed part as a signal.It outputs the movement amount of the operating mechanism of the switch as a signal, so that the rotating part operates the switch. A rotary encoder attached to the rotary shaft of the mechanism and a flexible arm for connecting the fixed part of the rotary encoder to the fixed part of the switch so as to be displaceable in directions other than the rotational direction, and the flexible arm of the switch. A magnet that is detachably fixed to the fixed portion is provided.

By adopting the rotary encoder, generation of measurement noise is prevented. Further, the flexible arm prevents the fixed portion of the rotary encoder from idling with respect to the fixed portion of the switch, but allows the fixed portion of the rotary encoder to be displaced with respect to the fixed portion of the switch. Therefore, even if the manipulator main shaft rotates at high speed and high torque, damage to the rotary encoder is prevented. In addition, mounting of the rotary encoder becomes easy.

As the rotary encoder of the present invention, a wire pull-out type rotary encoder can be adopted. This uses a rotary encoder having a wire reel in the rotating part, and connects the wire wound on the wire reel to the moving part of the operating mechanism of the switch. By using this wire pull-out type rotary encoder, the operating characteristic measuring device of the present invention can be applied to a small operating device such as a disconnecting switch.

Further, in the present invention, a CPU for processing the output signal of the rotary encoder can be provided. This CPU detects the contact movement amount, the output signals of the current sensors 13 and 14, and the open / closed state of the switch,
Each specified operating characteristic such as initial opening speed, average speed, operating time, current value, main circuit opening / closing time, main circuit 3-phase opening / closing misalignment time is automatically calculated.

Further, according to the present invention, various characteristics are measured irrespective of the type of the switch (whether the circuit breaker or the disconnector is different), the difference in the moving ratio of the link mechanism, the mounting timing of the rotary encoder, etc. A proprietary algorithm is used.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a switch operating characteristic measuring apparatus according to the present invention will be described below with reference to the drawings. Figure 1 shows that the operating characteristic measuring device is connected to a gas-insulated switchgear,
The circuit which measures the operating characteristic of a gas insulation switchgear is shown.

In FIG. 1, reference numeral 1 denotes a switch operating characteristic measuring device, which is composed of the following components. Reference numeral 2 is a power supply for supplying power to the operation characteristic measuring device 1. 3 is
CPU for performing signal processing of the entire measuring device 1, CPU board equipped with memory, etc., 6 Di / Do board equipped with input / output interface, 7 counter board equipped with up-down counter, 8 analog signal Is an A / D board equipped with an A / D converter for converting the signal into a digital signal, and these are connected to the bus 9.

A printer 4 prints the analyzed data. A floppy disk drive 5 stores the analyzed data. 10 is an operation panel,
Although illustration is omitted, an open switch, a close switch, a buzzer switch, a print switch, an FD initialization switch,
A save command switch to the FD, a circuit breaker, a disconnector changeover switch, a contact operation stroke setting switch, and a conduction (open / closed) input for three phases of the main circuit are connected.

Reference numeral 11 is a closed circuit relay, 12 is an open circuit relay,
It is connected to the Di / Do board 6 and turns on / off according to a command from the CPU board 7. 13 is a current sensor. Reference numeral 26 is a terminal portion for connecting to an external circuit. 3
Reference numeral 1 is a gas-insulated switchgear, which is composed of a circuit breaker 17 and an operating device 18 that drives the main contact 24 of the circuit breaker 17 to open and close.

As is well known, the operation unit 18 includes a closed circuit coil 19, an open circuit coil 20, a charging motor 21, and a control power supply 2.
2. The operation power supply 23 is provided. Further, the main shaft 25 of the operating device 18 rotates according to the amount of movement of the main contact 24 of the circuit breaker 17. A rotary encoder 15 is attached to the manipulator main shaft 25 in order to detect the amount of movement of the main contact 24.

The mounting structure of the rotary encoder 15 will be described later. The output signal of the rotary encoder 15 is input to the counter board 7. A signal is taken out from each part of the main circuit and control circuit of the gas insulated switchgear 31 and input to the operation characteristic measuring device 1. Alligator clips 16 are used to connect to the main and control circuits.

The power supply side and the load side of the main circuit of the gas insulated switchgear 31 are connected to the Di / Do board 6. In the measuring device 1, the on / off state of the main circuit contact 24 can be known from the energized state of the main circuit. Control power supply 2
2, a series circuit of current sensor 13-closed relay 11-closed coil 19 and current sensor 13-opened relay 1
2-A series circuit of open circuit coils 20 is connected. The current sensor 13 detects a current flowing through the closed circuit coil 19 or the open circuit coil 20, and the output thereof is input to the A / D board 8.

Further, in order to detect the current value flowing through the energy storage motor 21 of the operating device 18, a detachable current sensor 14 is attached to the drive circuit of the energy storage motor 21, and the output of the current sensor 14 is an A / D board. 8 is input. Here, the mounting structure of the rotary encoder 15 will be described with reference to FIGS. 2 and 3.

FIG. 2 shows the first mounting structure. A rotary encoder 15 having a hollow central shaft is used. The operating device main shaft 25 is inserted into the hollow portion, and the rotating portion of the rotary encoder 15 is fixed to the operating device main shaft 25. In addition, instead of directly fixing to the operation device main shaft 31, an extension metal fitting is attached to the operation device main shaft 25,
The rotary part of the rotary encoder 15 may be fixed to the extension fitting.

In order to prevent the rotary encoder 15 from idling, one end of a thin plate-shaped flexible arm 32 is attached to the fixed portion. Flexible arm 3
A magnet 33 is provided at the other end of 2, and the magnet 33 is fixed to the operation unit case 34 by magnetic force. By mounting the rotary encoder 15 using the flexible arm 32, the conventional alignment between the sensor and the manipulator main shaft becomes unnecessary.

By detecting the amount of movement of the contact by the rotary encoder 15, it is possible to prevent measurement noise from being generated unlike when a potentiometer is used. Further, by making the mounting structure as shown in FIG. 2, it is possible to suppress errors due to backlash, twisting, misalignment, etc., and accurately detect the movement amount of the contact as digital data without noise.

In a switch such as a disconnector,
The actuator is stored in a small box. Therefore, as shown in FIG. 2, it is difficult to attach a rotary encoder to the rotating portion of the operating device for detection. Thus, in a narrow place, a wire pull-out type rotary encoder as shown in FIG. 3 is used. FIG. 3 shows only the rotating part 41 of the wire pull-out type rotary encoder. The rotating portion 41 is provided with a slit disk 42, a rewinding spring 43, and a wire reel 44. Then, the tip of the stainless wire 45 wound around the wire reel 44 is attached to the linear motion portion 46 of the operating device 18.

Next, the operation of the operation characteristic measuring device described above will be described. To measure the operating characteristics, refer to Fig. 1.
As shown in Fig. 1, the operating characteristic measuring device 1 and the gas insulated switchgear
Connect with 1. Further, the contact stroke length of the switch is input from the operation panel 10 of the operation characteristic measuring device 1. Then, the closing switch or the opening switch of the operation panel 10 is operated.

When the circuit closing switch is operated, Di / Do
A command is issued from the board 6 to turn on the closed circuit relay 11. As a result, the closing coil 19 is energized, the main circuit contact 24 shifts from the open state to the closed state, and the switch is closed. At this time, the current flowing through the closed circuit coil 19 is detected by the current sensor 13, the voltage signals on the power supply side and the load side of the main circuit contact 24 are detected, and the drive current of the accumulator motor 21 is detected by the current sensor 14. It Further, a pulse is output from the rotary encoder 15 in response to the rotation of the manipulator main shaft 25 accompanying the movement of the main circuit contact 24. This pulse is counted by the counter 7.

In the CPU board 3, the conduction state of the main circuit is determined from the voltage signals on the power supply side and the load side of the main circuit. And the current signals from the current sensors 13 and 14,
Time series processing is performed based on the conduction state of the main circuit, and the movement amount of the contact is obtained from the following equation. Closure amount = (Design value of contact displacement) x (P1-
(P01) ÷ (PC1-P01) (However, P01 is when the open position is stable (when closed circuit measurement starts)
The pulse count value of PC1, PC1 is the pulse count value when the closed circuit position is stable (when the closed circuit measurement is completed), and P1 is the time-series pulse count value when the closed circuit). The relationship between P1, P01, and PC1 is shown in FIG.
It becomes as shown in.

Based on the above-mentioned time series processing, contact movement amount, and output signals of the current sensors 13 and 14, the initial opening speed, average speed, operating time, current value, main circuit opening / closing time, main circuit 3 phase opening / closing. The specified operating characteristics such as non-uniform time are automatically calculated. A publicly known method can be used for these calculation methods, and thus detailed description thereof will be omitted.

When the open switch of the operation panel 10 is operated, the same operation as above is executed. That is,
When the open circuit switch is operated, the open circuit relay 12 is turned on, the open circuit coil 20 is energized, and the main circuit contact 2
4 shifts from the closed state to the open state, and the switch is shut off. The amount of movement of the main circuit contact 24 at this time is obtained by the following equation.

Open circuit movement amount = (design value of contact movement amount) × (P2-P02) ÷ (PC2-P02) (where P02 is when the open circuit position is stable (when open circuit measurement is completed))
The pulse count value of PC2, the pulse count value of PC2 when the closed circuit position is stable (when the closed circuit measurement is started), and the time-series pulse count value of P2 when the closed circuit) P2, P02, and PC2 are shown in FIG.
It becomes as shown in.

By using the above equations, it is possible to automatically convert the amount of movement of the contact no matter which part of the link mechanism of the operating device the rotary encoder is attached to. Further, by using the above equations, the contact movement amount is automatically converted and the operating characteristics are calculated regardless of whether the rotary encoder is mounted in the closed state or the open state of the operating device.

The measurement result is printed and output by the printer. An example of the print result is shown in FIG. As shown on the left side of FIG. 4, contact movement amount (mm), control voltage (V),
Control circuit current (A), operating time (mS), initial opening speed (m / S), average opening speed (m / S), main circuit 3
The phase misalignment time (mS) etc. is recorded. In addition, as shown on the right side, contact travel, opening and closing state of the main circuit,
The current flowing through the closed coil is graphed and recorded.

According to this device, since the digitized data from each sensor can be processed by the CPU, the operating characteristics of the main circuit contacts can be obtained by simply inputting the contact stroke length of the switch to be measured into this device. It can be calculated automatically. Then, these calculations can be performed regardless of the mounting position of the rotary encoder mounted on the operating device, the amount of movement, or the linear or rotary motion of the operating device main shaft.

[0035]

According to the present invention, in the operation characteristic measuring device for a switch, a sensor for detecting the movement amount of the contact of the switch can be easily attached and no measurement noise is generated. You can Further, according to the present invention, each measurement item can be automatically calculated in the operation characteristic measuring device for a switch.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of an operating characteristic measuring device of the present invention.

FIG. 2 is a first example of a rotary encoder mounting structure in FIG.

FIG. 3 is a second example of a rotary encoder mounting structure in FIG.

FIG. 4 is a diagram showing a measurement result printed out by the apparatus of FIG.

FIG. 5 is a diagram for explaining contact travel of a switch.

[Explanation of symbols]

 1 ... Switch operating characteristic measuring device 3 ... CPU board 4 ... Printer 6 ... Di / Do board 7 ... Counter 8 ... A / D board 10 ... Operation panel 11, 12 ... Relay 13, 14 ... Current sensor 15 ... Rotary encoder 17 ... Circuit breaker 18 ... Operating device 19, 20 ... Coil 24 ... Main circuit contact 25 ... Operating device main shaft 31 ... Gas insulated switchgear 32 ... Flexible arm 33 ... Magnet 42 ... Slit disk 44 ... Wire reel 45 ... Wire

Claims (5)

[Claims] 1. A switch operating characteristic measuring device for detecting a movement amount of a contact of a switch as time series data, comprising a fixed part and a rotating part, and using a rotation amount of the rotating part with respect to the fixed part as a signal. A rotary encoder for outputting, which outputs the movement amount of the operating mechanism of the switch as a signal, so that the rotary unit is attached to the rotary shaft of the operating mechanism of the switch, and the fixing of the rotary encoder. A flexible arm for connecting the portion to the fixed portion of the switch so as to be displaceable in a direction other than the rotation direction, and a magnet for detachably fixing the flexible arm to the fixed portion of the switch. A switch operating characteristic measuring device characterized by: 2. A switch operating characteristic measuring device for detecting the amount of contact movement of a switch as time-series data, having a fixed part and a rotating part, and using a rotation amount of the rotating part with respect to the fixed part as a signal. A rotary encoder that outputs a rotary encoder having a wire reel in the rotating part, and outputs the movement amount of the operating mechanism of the switch as a signal, so that the wire wound around the wire reel of the rotary encoder is An operating characteristic measuring device for a switch, comprising: means for connecting to a moving part of an operating mechanism of the switch; and means for fixing a fixed part of the rotary encoder to a fixed part of the switch. 3. The switch operating characteristic measuring device according to claim 1, further comprising a CPU that processes an output signal of the rotary encoder. 4. The amount of movement of the contact when the switch is closed is calculated by: closing movement amount = (design value of contact movement amount) × (P1−
P01) ÷ (PC1-P01) (where P01 is the pulse count value when the open circuit position is stable, PC1 is the pulse count value when the closed circuit position is stable, P1
The operating characteristic measuring device for a switch according to claim 3, wherein is calculated as a time-series pulse count value when the circuit is closed. 5. The amount of movement of the contact when the switch is opened is calculated by: opening movement amount = (design value of contact movement amount) × (P2-
P02) ÷ (PC2-P02) (where P02 is the pulse count value when the open circuit position is stable, PC2 is the pulse count value when the closed circuit position is stable, P2
The operating characteristic measuring device for a switch according to claim 3, wherein is calculated as a time-series pulse count value when the circuit is closed.