JPH0754845Y2 - Liquid dissolved gas tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a portable dissolved gas tester for measuring the dissolved gas concentration in a sampled liquid.

[Conventional technology]

Conventionally, in oil-filled electrical devices such as transformers and reactors, analysis of dissolved gas in oil is often used for maintenance management.

This gas analysis was carried out by measuring the concentration of this hydrogen gas, paying attention to the fact that hydrogen gas is generated when a transformer double abnormality such as discharge or local overheating occurs. To be diagnosed.

However, if gas analysis by a general gas chromatograph is used to measure the concentration of the hydrogen gas, the device becomes large and expensive.

Therefore, for this kind of gas analysis, it has been proposed to use a small and inexpensive dissolved gas tester in liquid, which has a function of extracting dissolved gas in oil by bubbling (air blowing) and a function of measuring gas concentration by a semiconductor gas sensor. There is.

FIG. 5 shows the configuration of a conventional tester of this type. In FIG. 5, 1 is a commercial AC power source (AC) obtained from an AC power plug 2.
The power supply unit converts 100 V) into a DC power supply and outputs the DC power, and the DC power from the power supply unit 1 is supplied to the control unit 3, the sensor unit 4, the amplification unit 5, and the display unit 6, respectively.

Then, the measurement liquid sampled from the oil-filled transformer or the like is stored in the extraction container of the measurement system 7, and when the start operation is performed, the control unit 3 controls the measurement system 7 and the sensor unit 4 in sequence.

By this control, the pump or the like of the measurement system 7 is driven to blow air into the measurement liquid, the gas dissolved in the liquid is extracted, and the sensor unit 4 detects the extracted dissolved gas concentration.

Further, the gas concentration detection signal of the sensor unit 4 is amplified by the amplification unit 5, and the display unit 6 displays the dissolved gas concentration based on the detection signal.

And this kind of tester makes it possible to predict the internal abnormality of electric equipment by measuring the dissolved hydrogen gas concentration in oil of oil-filled electric equipment such as transformers, which is very effective in preventing accidents. Exert.

[Problems to be solved by the device]

In the case of the conventional tester shown in FIG. 5, since it is configured to use only the commercial AC power supply as its driving power supply, it can be measured only in the place where the commercial AC power supply can be secured, that is, in the place where the AC100V outlet is available. There is a problem that the place is limited.

Therefore, for example, in outdoor equipment such as an outdoor substation,
It is necessary to carry the measured solution to the place where there is a commercial AC power source that can be sampled and measured, which is time-consuming and it is necessary to be careful not to let gas out of the sampled solution.

In addition, there is a problem that measurement cannot be performed during a power failure even in a place where a commercial AC power source is present.

And, especially when performing internal abnormality prediction of oil-filled electrical equipment with this type of tester, the electrical equipment to be measured extends to the substation equipment in the mountains or mountains where commercial AC power cannot be easily obtained. Moreover, although the number of such devices is large and continuous use (measurement) is required for a long time, these requirements cannot be dealt with in the past and the application and range are extremely limited.

On the other hand, in this type of tester, it is desirable to perform highly accurate and stable measurement, and for that purpose, it is desirable to stabilize the power supply to each part.

INDUSTRIAL APPLICABILITY The present invention can be applied to a place or time where there is no commercial AC power supply, and can be applied even when the measurement is performed for a long time. Moreover, the measurement can be performed accurately and stably. It is an object of the present invention to provide a novel portable liquid-in-liquid dissolved gas stator that exerts a great effect in predicting an internal abnormality of an oil-filled electrical device.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in the liquid-dissolved gas tester of the present invention, an AC adapter plug for converting a commercial AC power source into a direct current and outputting the same is selectively used as an external power source plug. Plugged in,
Power input jack to which DC power of AC adapter or car battery is fed between positive and negative fixed contacts, and positive and negative DC power input terminals are connected to positive and negative fixed contacts. Provided between the power supply section for converting the DC power supply between the input terminals to a constant voltage by the constant voltage circuit and outputting it to the load side, and the disconnection terminal as the third DC power supply input terminal of the power supply section and the negative DC power supply input terminal. The built-in dry battery and the movable contact of the power input jack prevent the external power plug from being plugged into the power input jack. Connected to the power input terminal, the external power plug is plugged into the power input jack. When the external power is supplied, the movable contact separates from the positive fixed contact and the dry battery is disconnected from the positive DC power input terminal. Shi An extraction container in which air is blown into the measurement liquid to extract the dissolved gas in the measurement liquid, and a sensor unit that detects the concentration of the extracted dissolved gas in the extraction container by feeding the output of the constant voltage circuit. The fusing gas concentration is fed based on the detection signal of the control part, which is supplied with the output of the voltage circuit and controls the blowing of air into the extraction container and the detection of the concentration of the sensor part, and the output of the constant voltage circuit. And a display unit for displaying.

[Action]

In the case of the liquid-dissolved gas tester of the present invention configured as described above, when the external power plug is not inserted into the power input jack, the movable contact of the input jack as the automatic disconnection circuit becomes its positive fixed contact. The contact is made and the disconnection terminal of the power supply is connected to the positive DC power supply input terminal of the power supply via the movable contact and positive fixed contact of the power input jack, and the built-in dry cell inputs the positive and negative DC power supply of the power supply. Connected between terminals.

Therefore, the output of the dry battery is fed to the load side circuit section of the sensor section, the control section, and the display section through the constant voltage circuit of the power supply section,
The tester is driven by dry batteries.

Next, when the plug of the AC adapter is inserted into the power input jack, the movable contact of the power input jack separates from its positive fixed contact, the built-in battery is disconnected from the power supply section, and the AC adapter receives the power input. Connected between the positive and negative DC power supply input terminals of the power supply via the positive and negative fixed contacts of the jack.

Therefore, the output of the AC adapter is fed to the load side circuit section via the constant voltage circuit of the power supply section, and the drive power supply of the tester is switched to the commercial AC power supply.

Next, when the plug of the car battery's battery cord is plugged into the power input jack, the car battery receives positive and negative DC power input of the power supply in the same manner as when the AC adapter plug is plugged in. Connected between terminals.

Therefore, the output of the car battery is supplied to the load side circuit section via the constant voltage circuit of the power supply section, and the drive power of the tester is switched to the car battery.

Therefore, in addition to the commercial AC power supply, it operates with a built-in dry battery or car battery, is driven by a so-called three power supply system, and can be used in a place or at a time when the commercial AC power supply is absent.

Also, since it can be used with a car battery, long-term measurement can be performed without a commercial AC power supply.

Moreover, since the output of any of the AC adapter, built-in dry battery, and car battery is stabilized by the constant voltage circuit and power is supplied to the load side circuit of the power supply unit, the power supply of the tester is stabilized,
Prevents malfunctions due to power supply fluctuations and enables highly accurate and stable measurements.

〔Example〕

One embodiment will be described with reference to FIGS. 1 to 4.

FIG. 1 shows the entire structure, and the points different from the conventional structure of FIG. 5 are the following points (i), (ii), and (iii).

(I) A power input jack 10 is provided, and positive and negative fixed contacts 10a and 10b and a movable contact 10c forming an automatic disconnection circuit are provided on the jack 10.

(Ii) A power supply unit 1'is provided instead of the power supply unit 1 shown in FIG.
Positive and negative DC power supply input terminals 8 for De12V of this power supply unit 1 '
a and 8b are the positive and negative fixed contacts 10a and 10b of the power input jack 10.
Disconnection terminal 8c as the third DC power input terminal
Is connected to the movable contact 10c of the power input jack 10.

(Iii) Disconnection terminal 8c of power supply section 1 ', negative current power supply input terminal
Connect the positive and negative electrodes of the built-in dry battery 11 to 8b, and connect both terminals 8c and 8b.
A point where a dry battery 11 is provided between them. And power input jack 10
Includes a plug (adapter plug) 12c of the AC adapter 12 shown in FIG. 3 and a plug (cord plug) 13 of the battery cord (car battery cord) 13 of the car battery shown in FIG.
c is selectively plugged in as an external power plug.

In addition, 12a in FIG. 3 is an adapter body incorporating a transformer and a rectifying / smoothing circuit part, and 12b is an adapter body 12a and a plug 12c.
It is the code part between and.

And, the AC adapter 12 is a commercial AC power supply (AC100V) DC12
Converted to V DC and output this DC power from plug 12c.

Further, 13a in FIG. 4 is a battery plug which is detachably attached to a lighter socket of a cigarette lighter of an automobile 14 and is connected to a 12V DC car battery, and 13b is a cord portion between the plugs 13a and 13c.

And the DC power of 12V DC of the car battery is plug 13
Output from the plug 13c via a and the cord portion 13b.

Next, as shown in FIG. 1, the movable contact 10c of the power input jack 10 is a positive fixed contact 10a of the jack 10 when the plug 12c, 13c is not inserted into the jack 10 and no external power is supplied.
When the external power is supplied to the jack 10 from the plug 12c or 13c, the jack 10 separates from the positive fixed contact 10a of the jack 10 and becomes a so-called idle contact, which functions as an automatic disconnection circuit of the dry battery 11.

Further, the dry battery 11 is formed by serially connecting eight 1.5 V dry battery elements.

The negative DC power source input terminal 8b of the power source unit 1'is grounded, and the negative fixed terminal 10b of the power source input jack 10 connected to this terminal 8b and the negative electrode of the dry battery 11 are also always grounded.

Then, when the external power supply is not supplied, neither the plug 12c, 13c is inserted into the power input jack 10, the movable contact 10c of the power input jack 10 contacts its positive fixed contact 10a,
The positive electrode of the dry battery 11 is connected to the positive DC power supply input terminal 8a of the power supply unit 1'via the connection / disconnection terminal 8c of the power supply unit 1 ', the movable contact 10c of the power supply input jack 10 and the positive fixed contact 10a.

At this time, since the negative electrode of the dry battery 11 is connected to the negative DC power supply input terminal 8b of the power supply unit 1 ', the DC power supply input terminal 8b
A dry battery 11 is provided between a and 8b, and the DC12V battery power is supplied to a constant voltage circuit 9 as shown in FIG. 2 (a). From the constant voltage circuit 9, the control unit 3, the sensor unit 4, and the amplification unit are amplified. A stable DC power supply of a specified voltage (DC12V) is supplied to the load side circuit section of the section 5 and the display section 6.

The load side circuit unit is stably driven by the dry battery 11 by the supply of the DC power source, and the dissolved gas concentration in the measurement liquid housed in the extraction container of the measurement system 7 is accurately measured based on the sequence control of the control unit 3. It

Next, when using a commercial AC power supply of AC100V, AC10
AC adapter 12 adapter body into 0V commercial power outlet
12a is connected and its plug 12c is inserted into the power input jack 10.

When using a car battery, the battery cord
The plug 13c of 13 is inserted into the power input jack 10.

Then, the plug 12c or the plug 13c is the power input jack 10
, The movable contact 10c is separated from the positive fixed contact 10a, the dry battery 11 is disconnected from the constant voltage circuit 9 as shown in FIG. 2 (b), and the DC power input terminals 8a and 8b are connected to each other. A via the positive and negative fixed contacts 10a, 10b of the power input jack 10
The output of the C adapter 12 or the output of the car battery is applied, and the DC 12V DC power source (external power source) is supplied to the load side circuit unit such as the control unit 3 and the sensor unit 4 via the constant voltage circuit 9.

At this time, since the external power source is also stabilized by the constant voltage circuit 9, the load side circuit unit is stably driven and the dissolved gas concentration in the measurement liquid is accurately measured, as in the case of being driven by the battery power source of the dry battery 9. To be measured.

In addition to the commercial AC power supply, it is a portable tester of the so-called three power supply system that can measure with the built-in dry battery 11 and car battery.
The gas concentration can be measured using the dry battery 11 or the car battery even in a place where this power supply is not available or at the time of power failure, and the measurable range (application, range) is greatly expanded.

Therefore, particularly when measuring the gas concentration of dissolved hydrogen gas in oil of oil-filled electrical equipment such as transformers, it is possible to sufficiently cope with substation equipment in the mountains or mountain areas where commercial AC power cannot be obtained.

In addition, long-term measurements that cannot be handled by the dry battery 11 alone can be performed using the car battery, and long-term measurements can be performed anywhere within the vehicle's range of motion, just as when using a commercial AC power source. It is useful.

In addition, the output of any of the AC adapter 12, the dry battery 11, and the car battery is converted to a constant voltage by the constant voltage circuit 9 of the power source 1'and supplied to the load side circuit section such as the control section 3 and the sensor section 4, The power source of the load side circuit section is stabilized, and the dissolved gas concentration in the measurement liquid is accurately and stably measured by preventing malfunction due to power source fluctuation.

[Effect of device]

Since the present invention is configured as described above, it has the following effects.

Plug 12c of AC adapter 12 that converts commercial AC power to DC and outputs it, plug 13 of battery cord 13 of car battery
c has a power input jack 10 into which an external power plug is selectively inserted and a built-in dry battery 11, and an automatic disconnection circuit (movable contact 10c of the power input jack 10) allows plug 1
2c and 13c are not inserted into the power input jack 10 When the external power is not supplied, the positive and negative DC power input terminals 8 of the power supply 1 '
When a dry battery 11 is connected between a and 8b and the output of the dry battery 11 is supplied to the power supply unit 1'and the external power supply into which the plug 12c or the plug 13c is inserted is connected to the DC power input terminals 8a and 8b. Since the connection with the dry battery 11 is disconnected and the output of the AC adapter or car battery is supplied to the power supply unit 1 ', commercial AC power supply,
It is possible to supply power from the power source 1'to the control unit 3, the sensor unit 4 etc. by any of the three power sources of the built-in dry battery 11 and car battery, and provide a new portable dissolved gas tester in the so-called three power source system. can do.

The concentration of dissolved gas in the measurement liquid stored in the extraction container can be measured and displayed even when the commercial AC power supply cannot be used or at the time (during power failure), and the car battery must be used. As a result, measurement can be performed for a long period of time similar to when using a commercial AC power source, and therefore the application and range of use of this seed liquid dissolved gas tester can be greatly expanded.

Further, the outputs of the AC adapter 12, the dry battery 11, and the car battery are converted to a constant voltage by the constant voltage circuit 9 of the power supply unit 1'and supplied to the control unit 3, the sensor unit 4, etc. There is also an advantage that it is always stabilized, and malfunctions due to power supply fluctuations can be prevented and accurate and stable measurement can be performed.

[Brief description of drawings]

FIG. 1 and FIG. 4 are the 1 of the liquid dissolved gas tester of the present invention.
Fig. 1 shows an embodiment, Fig. 1 is a block connection diagram, and Fig. 2 (a).
And (b) are explanatory diagrams of a part of the wiring when the external power source is not fed and when it is fed, FIG. 3 is an explanatory diagram of an AC adapter, FIG. 4 is an explanatory diagram of a car battery cord, and FIG. 5 is a conventional example. It is a block connection diagram. 1 '... power supply section, 3 ... control section, 4 ... sensor section, 6 ...
... Display, 7 ... Measurement system with extraction container, 8a, 8b
...... Positive and negative DC power supply input terminals, 8c ... Disconnecting terminals, 9 ...
… Constant voltage circuit, 10 …… Power input jack, 10a, 10b ……
Positive / negative fixed contact, 10c ... moving contact, 11 ... dry battery, 1
2 …… AC adapter, 12c …… AC adapter plug, 13 ……
Car battery cord, 13c …… Car battery cord plug.

Claims (1)

[Scope of utility model registration request] 1. An AC for converting a commercial AC power supply into a DC power for output.
A power input jack to which the plug of the adapter or the plug of the battery cord of the car battery is selectively inserted as an external power plug, and the DC power of the AC adapter or the car battery is supplied between the positive and negative fixed contacts, A positive and negative DC power supply input terminal is connected to the positive and negative fixed contacts, and a power supply unit for converting the DC power supply between the positive and negative DC power supply input terminals into a constant voltage by a constant voltage circuit and outputting it to the load side. A built-in dry battery provided between the disconnection terminal as the third DC power supply input terminal of the power supply unit and the negative DC power supply input terminal, and a movable contact of the power supply input jack, and the external power supply plug. Is connected to the positive DC power supply input terminal by contacting the movable fixed contact with the positive fixed contact when the external power source is not fed into the power input jack,
The external power plug is inserted into the power input jack, and when the external power is supplied, the movable contact separates from the positive fixed contact to disconnect the dry battery from the positive DC power input terminal. An extraction container in which air is blown into the measurement liquid and the dissolved gas in the measurement liquid is extracted, and a sensor unit for detecting the concentration of the extracted dissolved gas in the extraction container supplied with power from the output of the constant voltage circuit. An output of the constant voltage circuit is supplied with power, a control unit that controls the blowing of the air into the extraction container and the detection of the concentration of the sensor unit, and an output of the constant voltage circuit is supplied with power and the sensor unit And a display unit for displaying the concentration of the dissolved gas based on the detection signal of.