WO2006137471A1 - コイルの水漏れ検出方法およびこの検出方法に適用する水漏れ検出装置 - Google Patents
コイルの水漏れ検出方法およびこの検出方法に適用する水漏れ検出装置 Download PDFInfo
- Publication number
- WO2006137471A1 WO2006137471A1 PCT/JP2006/312478 JP2006312478W WO2006137471A1 WO 2006137471 A1 WO2006137471 A1 WO 2006137471A1 JP 2006312478 W JP2006312478 W JP 2006312478W WO 2006137471 A1 WO2006137471 A1 WO 2006137471A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coil
- insulating layer
- surface electrode
- voltage
- potential
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/24—Protection against failure of cooling arrangements, e.g. due to loss of cooling medium or due to interruption of the circulation of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
Definitions
- the present invention relates to an insulating coil of a high-voltage electrical apparatus in which a conductor is directly cooled with cooling water. Cooling water leaks into the insulating layer due to deterioration of a brazed portion between a clip at a coil end and a copper wire.
- the present invention relates to a coil water leak detection method for detecting this and a coil water leak detection device applied to this detection method.
- a large-capacity rotating electrical machine is provided with a number of grooves on the inner side of a stator iron 1 formed in a cylindrical shape, and a lower coil 2b and an upper coil are provided in each groove. Pass through coil 2 with 2a as a pair!
- Coil 2 having a pair of lower coil 2b and upper coil 2a is formed as conductors 3a and 3b using a hollow rectangular copper wire alone or a solid rectangular copper wire mixed with a hollow rectangular wire as a strand.
- the cross-sectional outer shape of the conductors 3a and 3b is formed into a rectangular shape, and the insulating layers 4a and 4b are covered on the outside.
- the upper and lower coils 2a, 2b are connected to the ends of the conductors 3a, 3b by welding the clips 5a, 5b, and the conductors between the clips 5a, 5b are connected to each other.
- the conductors 3a and 3b are directly cooled by cooling water supplied from, for example, deionized water.
- the brazed portions of the conductors 3a, 3b and the clips 5a, 5b have deteriorated due to corrosion, have fine holes, and cooling water leaks into the insulating layers 4a, 4b.
- the coil 2 (2a, 2b) may break down and break into the iron core along the coil. is there.
- the capacitance is a force measured using a measuring device such as an LCR meter.
- the capacitance is measured using a frequency of 1 kHz or more.
- the present invention has been made in view of such circumstances, and enables the use of an alternating voltage or a direct current voltage having a low frequency of 1 kHz or less, as well as a small sensitivity / high sensitivity using an electrode device.
- An object of the present invention is to provide a coil water leak detection method capable of detecting a coolant leak and a coil water leak detection device applied to this detection method. [0016]
- the coil water leak detection method according to the present invention supplies the coil water covered with the insulating layer to the coil conductor as described in claim 1, and the cooling water is supplied to the coil conductor.
- an AC voltage is applied to the conductor, and a surface electrode device is pressed against the insulating layer, and the surface electrode device is grounded via an impedance. Then, the potential of the surface electrode device is measured, and when the measured potential is higher than that of a healthy coil, it is determined that water leaks from the brazed portion of the conductor to the insulating layer.
- the coil water leakage detection method according to the present invention includes a non-contact surface potentiometer, an AC voltage as described in claim 2. This is a method of measuring using either a measuring device or a voltage waveform observation device.
- the coil water leakage detection method supplies the coil conductor covered with the insulating layer and cools it as described in claim 3.
- an AC voltage is applied to the conductor, and a surface electrode device is pressed against the insulating layer, and the surface electrode device is passed through the impedance.
- the phase difference between the waveform of the potential of the surface electrode device and the waveform of the applied voltage is measured, and the measured phase difference is different from that of a healthy coil, the strength of the brazing portion of the conductor is also reduced. This is a method for determining that there is water leakage.
- the coil water leakage detection method according to the present invention is characterized in that the impedance inserted between the surface electrode device and the ground is a potential. This method uses the input impedance of the measurement system.
- the coil water leakage detection method supplies the coil conductor covered with an insulating layer and cools it as described in claim 5.
- a DC voltage is applied to the conductor and a surface electrode device grounded via an impedance is pressed against the insulating layer.
- the potential of the device is measured, and when the measured potential is higher than that of a healthy coil, it is determined that water leaks from the conductor to the insulating layer.
- the applied DC voltage is a DC voltage applied stepwise. It is the method characterized by this.
- the coil water leak detection apparatus includes a coil conductor coated with an insulating layer as described in claim 7, as described in claim 7.
- An AC power source that applies an AC voltage or a stepped DC voltage to the conductor when detecting whether or not cooling water leaks into the insulating layer.
- the coil water leakage detection device supplies the coil conductor covered with the insulating layer and cools it as described in claim 8.
- the AC voltage measuring device and the voltage waveform observing measuring device for measuring the impedance interposed between the surface electrode device and the ground, and the potential of the surface electrode device the device is provided with V deviation.
- the coil water leakage detection apparatus supplies the coil conductor covered with the insulating layer and cools it as described in claim 9.
- An AC power source for applying an AC voltage to the conductor or a stepped DC voltage power source when detecting whether water leaks into the insulating layer, and a surface electrode device in contact with the insulating layer;
- the apparatus includes an impedance interposed between the surface electrode device and the ground, and a computer interposing the potential of the surface electrode device.
- the water leakage detection device for a coil according to the present invention has a flexibility in which the surface electrode device is pressed against the insulating layer of the coil as described in claim 10.
- An electrode plate made of a material, a pressing plate for applying a pressing force to the electrode plate, and an insulating layer, a ground electrode, and a tassion layer arranged in order of the electrode plate side force between the electrode plate and the pressing plate. It is an intervening thing.
- the water leakage detection device for a coil has a flexible structure in which the surface electrode device is pressed against the insulating layer of the coil as described in claim 11.
- An electrode plate made of a conductive material, a pressing plate that applies a pressing force to the electrode plate, and a cushion layer, a ground electrode, and an insulating layer that are sequentially disposed between the electrode plate and the pressing plate from the pressing plate side.
- the support plate is provided with a notch in the intermediate position of each of the push plate, the cushion layer, and the ground electrode, and supporting the probe mounted at the notched position.
- the coil water leak detection apparatus includes a gripping portion as described in claim 12.
- the coil water leakage detection device is provided with the ground electrode to accommodate the cable, as described in claim 13.
- an insulating layer, a back electrode plate, and an electrode plate made of a flexible material are arranged in a stacked manner in order from the ground electrode cover.
- the coil water leak detection device is provided with the ground electrode and accommodates the cable as described in claim 14. And an insulating layer, a back electrode plate, a cushion layer, and an electrode plate arranged in order from the ground electrode cover, while electrically connecting the back electrode plate and the electrode plate. It is a configuration.
- the coil water leak detection device has a cable housed in the cable support portion with the core wire behind the electrode. It is configured to be connected to a lead wire provided on the plate.
- a coil water leak detection method and a coil water leak detection device applied to the detection method according to the present invention include a surface electrode device in contact with an insulating layer covering a conductor of the coil, and When the potential is measured and the measured potential is found to be statistically larger than the healthy coil potential, it is determined that the coil has leaked water, so a small electrode plate can increase the measurement sensitivity. Therefore, it is possible to detect water leaks with high accuracy at a low frequency.
- FIG. 1 is a schematic diagram showing a first embodiment of a coil water leak detection method and a coil water leak detection device applied to the detection method according to the present invention.
- 2 Equivalent circuit diagram used when explaining the method of detecting water leakage of a coil according to the present invention.
- FIG. 3 shows a case where there is a water leak in the coil and a case where there is no water leak in the coil according to the first embodiment of the water leak detection method of the coil and the coil water leak detection device applied to this detection method according to the present invention. And a relative permittivity diagram comparing changes in relative permittivity.
- FIG. 4 is a surface electrode potential diagram showing a change from the surface electrode potential with respect to a change in water leakage of the coil in the first embodiment.
- FIG. 5 Based on the assumption that water leakage is strong in the coil in the first embodiment described above, it shows how much the coil is in relation to the reference when there is water leakage. Surface electrode potential diagram.
- FIG. 7 A schematic diagram showing a first modification of the water leak detection apparatus in the first embodiment.
- FIG. 8 A schematic diagram showing a second modification of the water leak detection apparatus in the first embodiment.
- FIG. 9 Surface electrode potential diagram used when explaining the second embodiment of the coil water leak detection method according to the present invention.
- ⁇ 11 Schematic diagram showing a third modification of the water leak detection device in the first embodiment of the present invention.
- ⁇ 12 Potential line used when explaining the third embodiment of the coil water leak detection method according to the present invention. Figure.
- FIG. 14 A schematic view showing a first embodiment of a surface electrode device applied to a coil water leak detection device according to the present invention.
- FIG. 15 is a cross-sectional view cut along the XV-XV direction force of FIG.
- FIG. 17 is a cross-sectional view taken along the XVII-XVII direction force of FIG.
- FIG. 18 is a plan view showing a third embodiment of the surface electrode device applied to the coil water leak detection apparatus according to the present invention.
- FIG. 19 is a side view of FIG.
- FIG. 20 is a cross-sectional view taken along the line XX-XX in FIG.
- FIG. 21 is a longitudinal sectional view showing a fourth embodiment of a surface electrode device applied to a coil water leak detection apparatus according to the present invention.
- FIG. 22 is a longitudinal sectional view showing a fifth embodiment of the surface electrode device applied to the coil water leak detection apparatus according to the present invention.
- FIG. 23 is a plan view showing a sixth embodiment of a surface electrode device applied to a coil water leak detection apparatus according to the present invention.
- FIG. 24 is a side view of FIG.
- FIG. 25 is a conceptual diagram showing a part of a stator coil of a conventional rotating electrical machine.
- stator coil of a large-capacity turbine generator Since the direct cooling water type coil is often used for a stator coil of a large-capacity turbine generator, the stator coil of a large-capacity turbine generator will be described below as an example.
- FIG. 1 is a schematic diagram showing a first embodiment of a coil water leak detection apparatus according to the present invention.
- the coil water leak detection apparatus includes an AC power supply 11 that applies an AC voltage to the coil 10 that is directly cooled by cooling water, and a potential measurement device 12 that measures the potential of the coil 10. .
- the coil 10 is composed of an insulating layer 14 that winds a conductor 13 located in the central portion.
- the potential measuring device 12 includes a surface electrode device 15 attached to the insulating layer 14 of the coil 10, a potential measuring probe 17 provided with a potential measuring window 16 facing the surface electrode device 15, and a potential measuring probe 17. Is connected to the non-contact surface potential meter 19 for measuring the potential of the coil 10 and the non-contact surface potential meter 19 is connected to the non-contact surface potential meter 19 via the output terminal 20.
- a voltage measuring device 21 that measures the AC voltage applied to the coil 10 from the coil 10 and an impedance 22 that connects the surface electrode device 15 to the ground side of the AC power source 11 are provided.
- the present embodiment is not limited to the force using the non-contact surface potentiometer 19 for measuring the potential, and a voltage waveform observation and measurement device (oscilloscope) may be used.
- a probe suitable for the voltage waveform observation and measurement device is selected.
- the coil water leakage detection method for detecting a potential based on water leakage from the conductor 13 to the insulating layer 14 is the surface electrode device 1 of the coil 10.
- the measurement is performed by bringing the potential measurement window 16 of the potential measurement probe 17 close to the 5th side.
- an AC voltage E is applied from the AC power source 11 to the conductor 13 of the coil 10, and the potential of the insulating layer 14 at this time is measured by the non-contact surface potential meter 19 via the potential measuring probe 17, Read the voltage with the voltage measuring device 21.
- the average value of the surface potential of a healthy coil may be the median of all measured data, or a value corresponding to 50% of the normal probability distribution plot!
- the average value of the surface potential of a healthy coil is n times the standard deviation (n is 3 or If there is a large number of data, a value greater than 3 may be used, and the above data may be determined not to be a healthy coil.
- the AC voltage can be measured by the non-contact surface potential meter 19 itself, Measurement may be made with a non-contact surface potential meter 19.
- the applied voltage may be measured once at the beginning without having to measure every coil.
- the applied voltage waveform is not limited to a sine wave, and an AC waveform such as a triangular wave or a rectangular wave can be used to determine the leakage of water into the conductive force insulating layer by employing the above-described measurement method.
- FIG. 2 is an equivalent circuit diagram used when explaining the method for detecting water leakage of a coil according to the present embodiment.
- the insulating layer into which the cooling water has entered is 14 W, and the cooling water has yet to enter.
- Vd be a dry insulating layer 14d.
- the insulation layer between the surface electrode device 15 and the conductor 13 is used. 14 is represented by an equivalent circuit.
- the moisture absorption layer has a large dielectric loss, so that a parallel circuit element having a capacitance Cw and a resistance Rw is used, and the dried insulating layer has a small dielectric loss.
- the potential Vc of the surface electrode device 15 is given by the following equation by circuit calculation.
- the relative dielectric constant characteristics shown in Fig. 3 are calculated as the characteristics of the insulating layer that penetrates cooling water (moisture absorption) and the sound insulating layer, and is calculated using the equivalent circuit diagram and equation (1) shown in Fig. 2.
- the electric potential of the surface electrode device 15 is shown in FIG.
- Figure 4 shows an insulation thickness of 5 mm, surface electrode device area of 0.404 m 2 , applied voltage frequency of 50 Hz, surface electrode device ground impedance of 500 pF capacitance, 10 ⁇ ⁇ resistance, 500pF and 10 ⁇ ⁇ The three cases of parallel impedance in parallel with are calculated.
- the horizontal axis represents the thickness of the hygroscopic insulating layer
- the vertical axis represents the potential Z applied voltage of the surface electrode device.
- FIG. 4 shows changes in the potential of the surface electrode device with respect to changes in the thickness of the moisture-absorbing insulating layer, with a healthy coil having no water leakage as a reference. If the surface electrode potential shown on the vertical axis in FIG. 4 is replaced with the potential value of the surface electrode device when a healthy coil is used as a reference value, the characteristic diagram shown in FIG. 5 is obtained. In other words, this figure 5 is based on the case where the cooling water does not leak into the insulating layer such as the conductor of the coil, and when the cooling water leaks into the insulating layer, the value is not compared with the case where the value does not leak.
- Fig. 5 shows that even if the type of ground impedance is changed, it can be measured with high sensitivity as in the characteristic diagram shown in Fig. 4.
- FIG. 6 shows a potential diagram of the surface electrode device 15 showing how the potential of the surface electrode device 15 changes at the time of water leakage when used as a reference.
- AC voltage measuring devices 23a and 23b may be used. These AC voltage measuring devices 23a and 23b are digital type or digital multi type voltage types.
- a voltage waveform may be displayed using a voltage waveform observation and measurement device (oscilloscope) to measure the voltage.
- oscilloscope a voltage waveform observation and measurement device
- the impedance 22 may be directly connected to the surface electrode device 15, or may be connected to the input terminal side of the AC voltage measuring devices 23a and 23b! /.
- the potential of the surface electrode device 15 is converted into an AZD converter 2 for voltage measurement.
- the present embodiment increases the measurement sensitivity when detecting whether or not the cooling water leaks from the conductor 13 of the coil 10 to the insulating layer 14 by detecting the potential changing force of the surface electrode device 15. Therefore, it is possible to detect leakage of cooling water with high sensitivity under high sensitivity.
- FIG. 9 is used for explaining a second embodiment of the coil water leak detection method according to the present invention.
- FIG. 6 is a surface electrode potential diagram illustrating V.
- the phase of the potential of the surface electrode device 15 is caused by moisture absorption of the insulating layer 14 compared to the phase of the applied voltage. It was made by paying attention to the delay.
- This phase difference ⁇ can be obtained easily by displaying both the applied voltage and the potential of the surface electrode device 15 on the oscilloscope, and the time difference force at the zero voltage level.
- FIG. 10 shows an example in which the phase difference ⁇ is calculated using an equivalent circuit.
- Figure 10 shows the force for 50Hz, lkHz, and 10kHz applied voltages. Of these three frequencies, 1kHz is the most sensitive.
- phase difference ⁇ appears, it is determined that the coil has water leakage.
- phase difference meter may be used for measuring the phase difference ⁇ , the force for obtaining the phase difference shown in FIG. 9 using the circuits shown in FIGS. 1, 7, and 8, or FIG.
- the computer 25 can also calculate automatically.
- the latter has the advantage of measuring both voltage and phase difference.
- the phase difference may be obtained as an angle (degrees or radians), but the time difference may be used as data as it is.
- the present embodiment pays attention to the fact that a phase difference appears between the applied voltage and the potential of the surface electrode device when there is water leakage in the insulating layer. Since the phase based on each waveform with the potential is measured, the presence or absence of water leakage in the insulating layer can be detected more easily and more accurately.
- the force measuring device itself, the probe, the surface electrode device, and the like using a resistance, a capacitor, or a combination of both as the detection impedance have impedance to the ground. Any measurement system may be used positively as input impedance itself or as part of input impedance.
- the surface electrode device 15 attached to the coil 10 including the conductor 13 and the insulating layer 14 has a potential for measuring the voltage waveform with a coaxial cable 24 and a voltage division ratio (10: 1). It is displayed on the voltage waveform observation and measurement device (oscilloscope) 19a via the head 17a.
- the voltage applied to the coil 10 from the AC power supply 11 is also a voltage waveform observation and measurement device 1. Displayed in 9a.
- the coaxial cable 24 uses 3D2V with a length of 5 m (coaxial cable with a characteristic impedance of 50 ⁇ )
- a capacitor 25 with a capacitance of 500 pF is inserted between the core wire and the shield. Is done.
- a resistance of 10 M ⁇ and a capacitance of 9 pF are inserted between the ground and the total between the surface electrode device 15 and the ground.
- a resistor of 10 ⁇ and a capacitance of 509 pF are inserted in parallel as the detection impedance.
- the surface electrode device 15 that does not require a special detection impedance can be easily configured.
- the impedance 22 or the capacitor 25 may be provided in the same manner as in FIG. 1, FIG. 7, FIG. 8, and FIG.
- FIG. 12 is a potential diagram used when explaining a third embodiment of the coil water leak detection method according to the present invention.
- a DC voltage applied stepwise is used as the applied voltage.
- the measurement circuit used when detecting the presence or absence of water leakage is, for example, a force DC voltage that can use any of the circuits shown in FIGS. 1, 7, 8, and 11. It is desirable that the input impedance of the measurement system is high. Considering the high input impedance, it is preferable to use the non-contact surface electrometer 19 shown in FIG.
- the surface electrode device is applied before voltage application in order to avoid the influence of charging.
- the measurement when detecting whether there is water leakage from the coil conductor to the insulating layer, the measurement is performed using the DC voltage, so that the measurement sensitivity of the detection accuracy can be increased. Further, by using a DC voltage, the power source can be reduced in size and weight.
- FIG. 14 is a schematic diagram showing a first embodiment of a surface electrode device applied to a coil water leak detection device according to the present invention.
- the surface electrode device 15 applied to the coil water leak detection device includes a coaxial cable 24 attached to the electrode plate 15a and a gripping portion 26.
- this surface electrode device 15 has an insulating layer 27 made of, for example, a polyester film bonded to an electrode plate 15a, and a ground electrode 28 on the entire surface or a part thereof. It is composed by bonding.
- the surface electrode device 15 includes a pressing plate 30 with a cushion layer 29 interposed between the ground electrode 28 and the pressing plate 30 includes a gripping portion 26.
- the reason why the push plate 30 is provided with the cushion layer 29 interposed is that the electrode plate 15a can be easily adhered to the surface of the coil 10 having a gently curved surface or unevenness.
- the reason why the holding portion 26 is provided on the push plate 30 is to facilitate workability when the electrode plate 15a is attached in close contact with the coil through the gap between the narrow coils.
- the coaxial cable 24 has a shield for connecting the core wire to the electrode plate 15a as a ground electrode 2
- the electrode plate 15a and the ground electrode 28 are made of a material that is easily deformed softly, a metal foil such as tin foil or copper foil, a conductive plastic, a conductive rubber film, or a conductive material is applied. Is selected from among vapor-deposited plastic films and the like.
- the insulating layer 14 is made of various plastic films such as polyester, polyimide, and rubber. One of them is selected.
- the surface area of the electrode plate 15a is larger than that of the ground electrode 28. Good
- the surface area of the insulating layer 27 is required to be larger than the smaller one of the surface area of the electrode plate 15a and the surface area of the ground electrode 28.
- the surface area of the ground electrode 28 is determined by the detected impedance.
- the electrostatic capacity Cc between the electrode plate 15a and the ground electrode 28 can be obtained by the following equation.
- ⁇ r is the dielectric constant of the insulating layer 27, and ⁇ is the vacuum dielectric constant.
- the ground electrode 28 is provided in the surface electrode device 15 to be mounted on the surface of the coil 10, and the impedance is secured in the interior by the ground electrode 28, and disturbance from the periphery is also provided.
- the disturbance isotropic force based on the potential fluctuation of the gripping part 26 and the push plate 30 is shielded, it is possible to reduce the potential measurement error and more accurately measure the presence or absence of water leakage to the insulating layer.
- FIG. 16 is a schematic diagram showing a second embodiment of a surface electrode device applied to a coil water leak detection device according to the present invention.
- the surface electrode device 15 applied to the water leakage detection device of the coil includes a holding member 26 on the push plate 30 and a support 32 that supports the probe 31 on the push plate 30.
- the surface electrode device 15 has an insulating layer on one side surface of the electrode plate 15a.
- the probe 31 is attached via the support tool 32 supported on it.
- the ground electrode 28 is bonded to the portion of the insulating layer 27 excluding the probe 31.
- the surface electrode device 15 has a cushion layer 29 bonded to a portion excluding the probe and the support 32, a pressing plate 30 bonded to the cushion layer 29, and a gripping portion attached to the pressing plate 30. 26 are provided.
- the insulating layer 27 is provided on the electrode plate 15a, the intermediate positions of the cushion layer 29 and the ground electrode 28 are cut out, and the probe mounted at the cut out position is used.
- a support 32 for supporting and fixing 31 is provided, and at the time of measurement, the change of the measured value based on the disturbance of the surroundings is restrained by the restraining force of the support 32, and at the same time, using the cushioning force of the cushion layer 29, Since the adhesion of the electrode plate 15a to a coil (not shown) is further improved, it is possible to contribute to further improvement in accuracy when measuring the potential.
- 18 to 20 are schematic views showing a third embodiment of the surface electrode applied to the coil water leak detection apparatus according to the present invention.
- FIG. 18 is a plan view of the surface electrode device
- FIG. 19 is a side view of the surface electrode device
- FIG. It is the cut
- the surface electrode device 15 applied to the coil water leak detection device is a conductive material in which the bottom side force is selected in order from the rubber material, for example, carbon, metal powder, or short fiber in order toward the top side.
- Flexible electrode plate 15a, back electrode plate 15b, insulating layer 27, and ground electrode 28 filled with conductive particles are placed, bonded and stacked in layers, and connected to the ground electrode 28 to support and fix the coaxial cable 24
- a cylindrical cable support 33 is provided.
- the surface electrode device 15 has one end connected to the core wire 34 of the coaxial cable 24 supported by the cable support portion 33 and the other end inserted through the insulating layer 27.
- a lead wire 35 connected to the back electrode plate 15b is provided.
- one end of the coaxial cable 24 is connected to the ground electrode 28 via the cable support portion 33, or directly connected to the ground electrode 28 for shielding and coaxial.
- the other end of the cable 24 is connected to an AC voltage measuring device (not shown), and the potentials of the electrode plate 15a and the back electrode plate 15b are measured.
- the back electrode plate 15b for example, a copper plate or a stainless steel plate is suitable for attaching the lead wire 35.
- the cable support 33 also shields the coaxial cable 24. Therefore, a metal conductive material is preferable.
- the lead wire 35 is provided on the back electrode plate 15b, and the cable support for supporting and fixing the coaxial cable 24 when the core wire 34 of the coaxial cable 24 is connected to the lead wire 35. Since it is configured to be able to completely shield the disturbance from the surroundings, for example, when operating the adjacent coil or operating the surface electrode device itself, it is completely shielded from the measurement in the unit 33. Can contribute to further improvement in accuracy.
- the core wire 34 of the coaxial cable 24 when the core wire 34 of the coaxial cable 24 is connected to the lead wire 35 provided on the back electrode plate 15b, it is performed in the cable support portion 33. As shown in FIG. 21, the lead wire 35 and the core wire 34 of the coaxial cable 24 are connected within the cable support 33, and a cushion layer 29 is interposed between the electrode plate 15a and the back electrode plate 15b. The electrode plate 15a and the back electrode plate 15b may be connected by the connection line 36.
- FIG. 22 is a schematic diagram showing a fifth embodiment of the surface electrode device applied to the coil water leak detection device according to the present invention.
- the surface electrode device 15 applied to the coil water leak detection device has an electrode plate 15a, a back electrode plate 15b, an insulating layer 27, a stainless steel, which are made of a flexible material in order toward the top side of the bottom side force.
- a ground electrode 28 made of steel is placed, glued and stacked in layers, and it is composed of a potential measurement probe support 37 that is connected to the ground electrode 28 and accommodates a potential measurement probe 17 with a potential measurement window 16. Is done.
- the potential measurement probe support 37 is made of an insulating glass epoxy laminate and has a cylindrical shape.
- the potential measurement probe support portion 37 that accommodates the potential measurement probe 17 is provided on the installation electrode 28, and the disturbance due to the peripheral force is shielded by the potential measurement probe support portion 37. Since the configuration is adopted, it is possible to contribute to further improvement in accuracy during potential measurement.
- the attachment positions of the gripping part 26, the coaxial cable 24, the electrode plate 15a and the ground electrode 28 shown in FIGS. 14 and 22 are not limited to the illustrated positions, but are changed to 90 °. It is possible to change the mounting angle by changing the mounting angle.
- the attachment position of the coaxial cable 24 shown in FIG. 20 is changed to an angle of 90 °
- the attachment position of the coaxial cable 24 is as shown in FIG. 23 and FIG.
- the coaxial cable 24 is not used with the cable support portion, but simply bonded to the handle portion of the ground electrode 28, or stopped with an adhesive tape.
- the surface electrode device is thin, and the potential can be measured with high accuracy by attaching the electrode plate 15a even at a position in a narrow gap of the coil.
- the electrode plate 15a and the back electrode plate 15b in each embodiment are not limited to a quadrilateral force, for example, and may be any shape such as a circle, an ellipse, and a polygon.
- the explanation has been given by using a coaxial cable for the lead wire connecting the surface electrode device to the AC voltage measuring device, considering that the potential measurement is performed in the low frequency region, it may not be a coaxial cable. Prefers electric wires with
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06767136A EP1898515A4 (en) | 2005-06-23 | 2006-06-22 | METHOD FOR DETECTING THE WATER LEAKAGE OF A SINK AND A WATER LEAK DETECTOR APPLICABLE TO THIS PROCESS |
US11/993,471 US20100073012A1 (en) | 2005-06-23 | 2006-06-22 | Method for detecting water leakage of coil and water leakage detector applicable to this method |
AU2006260145A AU2006260145B2 (en) | 2005-06-23 | 2006-06-22 | Method for detecting water leakage of coil and water leakage detector applicable to this method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-183359 | 2005-06-23 | ||
JP2005183359A JP4783069B2 (ja) | 2005-06-23 | 2005-06-23 | コイルの水漏れ検出方法およびこの検出方法に適用する水漏れ検出装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006137471A1 true WO2006137471A1 (ja) | 2006-12-28 |
Family
ID=37570498
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/312478 WO2006137471A1 (ja) | 2005-06-23 | 2006-06-22 | コイルの水漏れ検出方法およびこの検出方法に適用する水漏れ検出装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100073012A1 (ja) |
EP (1) | EP1898515A4 (ja) |
JP (1) | JP4783069B2 (ja) |
AU (1) | AU2006260145B2 (ja) |
WO (1) | WO2006137471A1 (ja) |
ZA (1) | ZA200711161B (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7960978B2 (en) * | 2008-10-21 | 2011-06-14 | Thermacor Process, Lp | Method for providing leak detection in pre-insulated piping |
JP5882019B2 (ja) * | 2011-10-17 | 2016-03-09 | 株式会社日立製作所 | インバータ駆動回転電機の試験方法、及び回転電機の試験方法 |
JP6139333B2 (ja) * | 2013-08-27 | 2017-05-31 | ミネベアミツミ株式会社 | 漏水検知装置 |
US9655283B2 (en) * | 2014-06-30 | 2017-05-16 | Microsoft Technology Licensing, Llc | Submerged datacenter |
US20160178475A1 (en) * | 2014-12-17 | 2016-06-23 | Intel Corporation | Leak detection in liquid cooled computing systems |
DE102017214717B3 (de) * | 2017-08-23 | 2018-12-20 | Volkswagen Aktiengesellschaft | Antriebsbauteil |
EP3462156B1 (en) * | 2017-09-27 | 2019-11-06 | Smart Leak Solution (SLS) Limited | Leak detection and location system and method |
KR102380441B1 (ko) * | 2018-03-16 | 2022-03-29 | 주식회사 엘지에너지솔루션 | 냉각수 누설 검출 장치 |
WO2021064566A1 (en) * | 2019-10-03 | 2021-04-08 | 3M Innovative Properties Company | Capacitive touch sensor-based leak detector film |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS493105A (ja) * | 1972-04-28 | 1974-01-11 | ||
JPH04299051A (ja) * | 1991-03-27 | 1992-10-22 | Mitsubishi Electric Corp | 回転電機 |
JPH04299050A (ja) * | 1991-03-27 | 1992-10-22 | Mitsubishi Electric Corp | 回転電機 |
JP2003315402A (ja) * | 2002-04-26 | 2003-11-06 | Toshiba Corp | コイル劣化診断方法およびこの診断方法に適用するコイル劣化診断装置 |
JP2005148039A (ja) * | 2003-10-24 | 2005-06-09 | Toshiba Corp | コイルの余寿命推定方法およびコイルの余寿命推定装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2715399A1 (de) * | 1976-07-15 | 1978-01-19 | Takeda Chemical Industries Ltd | Verfahren und vorrichtung zur pruefung geschlossener behaelter auf defekte |
US5047721A (en) * | 1990-08-06 | 1991-09-10 | Farley Earl T | Faulty lamp tester |
US5345356A (en) * | 1992-06-05 | 1994-09-06 | At&T Bell Laboratories | ESD protection of output buffers |
US5546008A (en) * | 1994-08-11 | 1996-08-13 | General Electric Co. | Inflatable capacitance measuring device |
JP2856698B2 (ja) * | 1995-08-08 | 1999-02-10 | 株式会社東芝 | 回転電機用固定子巻線の静電容量測定装置とその方法ならびに回転電機 |
JP2003035738A (ja) * | 2001-07-19 | 2003-02-07 | Omron Corp | 部品実装基板の検査方法および部品実装基板用の検査装置 |
US6906530B2 (en) * | 2002-05-30 | 2005-06-14 | D.J. Geisel Technology, Inc. | Apparatus and method to detect moisture |
US7068039B2 (en) * | 2004-04-28 | 2006-06-27 | Agilent Technologies, Inc. | Test structure embedded in a shipping and handling cover for integrated circuit sockets and method for testing integrated circuit sockets and circuit assemblies utilizing same |
-
2005
- 2005-06-23 JP JP2005183359A patent/JP4783069B2/ja active Active
-
2006
- 2006-06-22 AU AU2006260145A patent/AU2006260145B2/en active Active
- 2006-06-22 US US11/993,471 patent/US20100073012A1/en not_active Abandoned
- 2006-06-22 WO PCT/JP2006/312478 patent/WO2006137471A1/ja active Application Filing
- 2006-06-22 EP EP06767136A patent/EP1898515A4/en not_active Withdrawn
-
2007
- 2007-12-20 ZA ZA200711161A patent/ZA200711161B/xx unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS493105A (ja) * | 1972-04-28 | 1974-01-11 | ||
JPH04299051A (ja) * | 1991-03-27 | 1992-10-22 | Mitsubishi Electric Corp | 回転電機 |
JPH04299050A (ja) * | 1991-03-27 | 1992-10-22 | Mitsubishi Electric Corp | 回転電機 |
JP2003315402A (ja) * | 2002-04-26 | 2003-11-06 | Toshiba Corp | コイル劣化診断方法およびこの診断方法に適用するコイル劣化診断装置 |
JP2005148039A (ja) * | 2003-10-24 | 2005-06-09 | Toshiba Corp | コイルの余寿命推定方法およびコイルの余寿命推定装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1898515A4 * |
Also Published As
Publication number | Publication date |
---|---|
JP2007006608A (ja) | 2007-01-11 |
EP1898515A4 (en) | 2010-05-19 |
AU2006260145B2 (en) | 2010-09-09 |
US20100073012A1 (en) | 2010-03-25 |
JP4783069B2 (ja) | 2011-09-28 |
AU2006260145A1 (en) | 2006-12-28 |
EP1898515A1 (en) | 2008-03-12 |
ZA200711161B (en) | 2008-11-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2006137471A1 (ja) | コイルの水漏れ検出方法およびこの検出方法に適用する水漏れ検出装置 | |
JP4384205B2 (ja) | クロスキャパシタンスを用いた発電機固定子巻線絶縁物の吸湿試験装置及びその方法 | |
US10585137B2 (en) | Method and device for testing a galvanic connection of a high-voltage condenser bushing assembly | |
US5760590A (en) | Cable integrity tester | |
JP3158063B2 (ja) | 非接触電圧計測方法及び装置 | |
JP4497790B2 (ja) | コイル劣化診断方法およびこの診断方法に適用するコイル劣化診断装置 | |
JPH10177053A (ja) | 回転電機の固定子コイルの劣化検知方法及び装置 | |
JP4257839B2 (ja) | 電力ケーブル遮蔽導体の接地不良検出装置 | |
CN104655945A (zh) | 一种测量油纸复合绝缘部件空间电荷分布的装置及方法 | |
JP2007085959A (ja) | 静電容量式変位センサー | |
CA1277705C (en) | Apparatus for detecting faulty power line insulator | |
JP2628738B2 (ja) | 電力ケーブル試験装置 | |
WO2022085358A1 (ja) | マグネットワイヤ被覆の検査装置、マグネットワイヤ被覆の検査方法、および電気機械の製造方法 | |
WO2019181771A1 (ja) | 湿度検知装置 | |
JP2007139718A (ja) | 電力ケーブルの水トリー劣化診断方法 | |
WO2005040840A1 (ja) | コイルの余寿命推定方法およびコイルの余寿命推定装置 | |
JP3849516B2 (ja) | 電磁流量計 | |
Haridi et al. | Analysis of Sensitive Parameters in Insulating Mineral Fluids for Assessing Power Transformer Health | |
JP2024013182A (ja) | 二次電池の絶縁評価装置 | |
JP2023030379A (ja) | 部分放電検出装置 | |
KR20110031677A (ko) | 정전용량 측정 장치 | |
JP2000299952A (ja) | 水中モータ及びその絶縁診断方法並びに水中モータを備えたポンプ設備 | |
JP2012239253A (ja) | 検電装置、ガス絶縁開閉装置、導体支持装置および検電方法 | |
JP2001305174A (ja) | 高電圧絶縁機器の直流漏れ電流測定法 | |
JPH0119105B2 (ja) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2006767136 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2006260145 Country of ref document: AU |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2006260145 Country of ref document: AU Date of ref document: 20060622 Kind code of ref document: A |
|
WWP | Wipo information: published in national office |
Ref document number: 2006260145 Country of ref document: AU |
|
WWE | Wipo information: entry into national phase |
Ref document number: 11993471 Country of ref document: US |