WO1993015411A1 - Procede de prediction de courts-circuits et appareil correspondant - Google Patents

Procede de prediction de courts-circuits et appareil correspondant

Info

Publication number
WO1993015411A1
WO1993015411A1 PCT/JP1993/000083 JP9300083W WO9315411A1 WO 1993015411 A1 WO1993015411 A1 WO 1993015411A1 JP 9300083 W JP9300083 W JP 9300083W WO 9315411 A1 WO9315411 A1 WO 9315411A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
phase
cable
signal
polarity
Prior art date
Application number
PCT/JP1993/000083
Other languages
English (en)
Japanese (ja)
Inventor
Akira Saigo
Akio Sera
Fukuso Terunaga
Katuhiko Suefuji
Tomoaki Kageyama
Original Assignee
Mitsui Petrochemical Industries, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsui Petrochemical Industries, Ltd. filed Critical Mitsui Petrochemical Industries, Ltd.
Publication of WO1993015411A1 publication Critical patent/WO1993015411A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
    • G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
    • G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements

Definitions

  • the present invention relates to a wisteria prediction device, and more particularly, to a method and device capable of constantly monitoring the progress of insulation deterioration of an electric fiber device and a cable in a live state.
  • This uses a corona discharge or a partial discharge generated when the transmission ⁇ decreases, and enables the location of the discharge to be identified by changing the direction of these discharges.
  • the resulting high-frequency noise is detected by a plurality of sensors provided on the power supply.
  • the above-described device can determine at which position in the transmission the fiber degradation between the grounds is occurring, that is, it is possible to predict a ground fault accident due to the progress of insulation degradation. However, it is not possible to foresee a short-term accident due to the progress of inferiority.
  • the present invention has been made in view of the above circumstances, and not only predicts a short circuit accident due to ⁇ ⁇ due to progress of vertical element deterioration between the grounds, but also predicts a short circuit accident due to progress of element deterioration between phases. 3 ⁇ 4 ⁇ It is intended to provide a short-term prediction device for equipment and cables. Disclosure of the invention
  • the polarities of the signals of the first sensor, the second sensor, and the third sensor are compared to determine the deterioration of the brightness.
  • the first sensor By configuring the first sensor with an air-core core, a commercial frequency load current and its harmonics, which become noise with respect to the traveling wave current caused by the partial discharge accompanying the deterioration of the signal as a signal, are generated. / N specific power, and the first sensor can be small and can be used with a high efficiency.
  • a core is inserted into the air core of the first sensor to reduce the current with a small current, and the core is opened at the zero cross ffiS of the load current flowing through the primary side of the first sensor. and the first pulse signal obtained in the secondary winding of the sensor phase to give the secondary winding of the first sensor by the progressive wave current due to the partial discharge by « ⁇ equipment and Ke one bull ⁇ of By changing the phase of the signal to be obtained, it is possible to estimate the cause of the deterioration of the component.
  • the view of the earth between the grounds is as follows. That is, when a defect force s is generated in the insulation between the electrical equipment and the cable ground, a partial discharge is generated at that location. Then, due to this discharge, a traveling wave is generated in the distributed constant circuit between »and the ground, and travels in both directions above the defective part. Therefore, by changing the direction of the traveling wave, it is possible to specify a transmission path with a low capacity between the ground and the ground. Further, by controlling the intensity of the traveling wave current and controlling the tendency thereof, it is possible to predict that the vehicle will proceed to a ground fault or »accident.
  • the following is a method for detecting the direction of the row wave, in the case of ⁇ ⁇ below the ground, for each phase of the three first sensors (CR, CS, CT) provided for each phase of the cable.
  • the polarity of the signal, the polarity of the signal of the corresponding phase of the three second sensors (C r, C s, C t) provided on the shield wire of each phase of the cable, and the shield wire to the collective ground wire By changing the polarity of the signal of one provided third sensor (C), it is possible to know the phase in which the ground-to-ground deterioration has occurred.
  • the phase of each phase of the cable is determined. This can be performed by comparing the polarity of the signal of one third sensor (C) provided on the ground wire with the shielded wires and the polarity of the signal of the second sensor or the polarity of the signal of the first sensor. . Further, the determination as to whether the signal is a signal caused by the vertical element degradation or a signal caused by the common mode noise is performed by determining the polarity of all the phases of the first sensor by Jt $ 3 ⁇ 4. Alternatively, this can be done by iterating the polarity of the signals of all phases of the second sensor.
  • the signals of the two phases of each of the three first sensors (CR, CS, and CT) provided for each phase of the cable are used. Isolation between phases by comparing the polarity with the polarity of the corresponding two-phase signals of the three second sensors (C r, C s, C t) provided on the shielded wires of each phase of the cable.
  • the two phases that have deteriorated can be known.
  • the two-phase of the second sensor is used as a method for determining whether the insulation deterioration is on the load side from the installation point of the first sensor or on the power supply side from the installation point of the first sensor.
  • the polarity of the two phases of the first sensor can be known by varying 1 8 0 °. Further, whether the signal is caused by fiber deterioration or a signal caused by common mode noise is determined by determining the polarity of all phases of the first sensor or by determining the polarity of all phases of the second sensor. This can be done by changing the polarity of the signal. Whether the signal is caused by inter-phase fiber deterioration or other signal is determined by using a shield line of each phase of the cable in the case of a signal caused by an infinite gap between the ages.
  • the third sensor (C) provided on the ground wire that collectively includes the signals
  • other signals can be generated by generating a signal at the third sensor.
  • the first sensor is formed of an air core such as a so-called Rogowski coil
  • the load current can avoid the effect of the ⁇ :! ⁇ port of the core.
  • ⁇ of a void discharge in fe ⁇ is a discharge pulse measurement with a uniform t ⁇ size in the voltage phase range of 0 to ⁇ / 2, ⁇ to 3 Is done.
  • the voltage phase is 0 ⁇ 7 ⁇ /
  • the pulse distribution power is measured such that the discharge pulse increases to the right with respect to the phase of JJ.
  • the discharge pulse is large in the range of 0 to r; and the discharge pulse is small in the range of 3 ⁇ 4] £ 2. Is done.
  • the intensity of the discharge pulse that is, the amount of discharge charge, increases, and the generation of the discharge pulse occurs at the zero cross point (0, r, 27) ), It is possible to find the Sjg of the vertical member by measuring over time.
  • FIG. 2 is a circuit diagram showing a second embodiment according to the present invention.
  • FIG. 3 is a signal propagation diagram in a case where a vertical element between phases is deteriorated, for explaining an operation showing an embodiment of the present invention.
  • FIG. 3 is a circuit diagram showing a third embodiment according to the present invention.
  • FIG. 1 is a structural diagram of a sensor showing an embodiment of a sensor according to the present invention.
  • FIG. 8 Front view of a sensor showing one embodiment of a sensor according to the present invention
  • FIG. 4 is a graph for explaining the operation of the sensor according to the embodiment of the sensor according to the present invention.
  • FIG. 3 is an operational drawing of the sensor showing one embodiment of the sensor according to the present invention.
  • FIG. 1 is an equivalent circuit diagram of a sensor showing an embodiment of a sensor according to the present invention.
  • FIG. 1 is a block diagram showing a configuration example of a MONITOR of the present invention.
  • Figure 1 shows ⁇ to the origin S ⁇ G.
  • the ground is connected to buses R, S, and T, which are Vr, Vs, and Vt, via circuit breakers CB and to three-phase generators with three cables.
  • the single-core cables of each phase are provided with first sensors CR, CS, and CT so as to surround the cables.
  • the first sensor shields the signal by passing the ground wire connected to the shield of the cable of each phase through the first sensor of the corresponding phase toward power generation in order to capture the signal that forms the core of the cable.
  • the signal passing through the ground spring is canceled by the signal passing through the ground spring.
  • the shield ground wire passing through the first sensor of each phase passes through the second sensor Cr, Cs, and Ct of the corresponding phase to be the primary winding of each second sensor. Then, the shield ground wire passing through each of the second sensors is collectively passed through the third sensor C to be a primary winding of the third sensor C.
  • the shield earth spring that passed through the third sensor C is grounded (E).
  • the secondary winding of the first sensor CR, CS, CT is connected to BUFFER (1). It is. In BUFFER (1), after shaping and amplifying the signal from the first sensor and removing the microwave noise, the output is connected to the MONITOR (detection unit) that performs fiber prediction.
  • MONITOR detection unit
  • the secondary winding of the second sensor Cr, Cs, Ct and the secondary winding of the third sensor C are connected to BUFFER (2).
  • BUFFER (2) after shaping and amplifying the signals from the second sensor and the third sensor, and after removing the fijg wave noise, the output is connected to MONITOR which performs short-circuit prediction.
  • MONITOR compares the polarity of the signal of the first sensor via BUFFER (1) with the polarity of the signals of the second and third sensors via BUFFER (2). Is done.
  • M 0 NIT ⁇ R is represented by (polarity measurement unit 11 that measures the polarity of the symbol, intensity measurement unit 12 that measures the intensity of ⁇ fg, A part 13 for measuring the polarity and strength of the ⁇ symbol measured by the measuring part, a determining part 14 for judging the deterioration of the signal and the fiber deterioration based on the uncomfortable result by the comparing part, and a determination part for the determination result
  • the MONITOR includes a display as an output unit 15.
  • the MONITOR uses a comparison unit to output the CR of the first sensor and the Cr of the second sensor, the CS of the first sensor, the Cs of the second sensor, The combination of the CT of the first sensor and the Ct of the second sensor determines the polarity and strength of each signal.At the same time, the determination unit determines the polarity of the third sensor C with respect to the signals of the first sensor and the second sensor. Depending on the logic circuit in combination with the strength, whether the signal is due to insulation deterioration or noise Further, the determination unit determines the type of the class component and determines whether the result is a force that is a vertical component deterioration between the grounds or a component deterioration between the phases. As a result, the recording unit performs 3 ⁇ 4 ⁇ of the phase in which the fiber is inferior, and outputs the degree of deterioration (OUTPUT).
  • FIGS. 3 and 4 have the same configuration as FIG. 1, but the cable connecting the circuit breaker CB and the electrical equipment is shown by a distributed constant circuit.
  • L 1 shown in FIGS. 3 and 4 is the inductance that indicates the distribution constant of the cable core, and C 1 is the cable inductance.
  • the capacitance is the distribution constant of the absolute: between the core wire and the shield.
  • Figure 3 shows the case where interphase fiber deterioration occurs between the R and S phases inside the device.
  • electric charge is instantaneously discharged from point X inside the electronic device in Fig. 3 to the phase on the rain side of point X.
  • Fig. 3 the case where the positive pulse charge is in the R phase and the negative pulse charge is in the S phase is shown.
  • This pulse charge is divided into those that travel inside the equipment and those that travel in the cable.
  • a traveling wave having a (+) polarity is generated in the core wire, and a traveling wave force having a (1) polarity is generated in a shield. It progresses as a traveling wave.
  • a traveling wave having (-) polarity is generated in the core wire, and a traveling wave having (+) polarity is generated in the shield, and the distribution constant of each cable is obtained.
  • the circuit travels in a traveling wave.
  • the R-phase first sensor has (+) polarity and (1) polarity, but the (1) polarity traveling wave is canceled by the shield earth wire. Therefore, a (+) polarity signal is applied to the secondary winding of the first sensor CR.
  • the S-phase first sensor has traveling waves of (1) polarity and (+) polarity, but the traveling wave of (+) polarity cancels out because the (+) traveling wave counters the shield ground wire. Therefore, a signal of (1) polarity is obtained in the secondary winding of the first sensor CS.
  • the traveling wave caused by the ecstasy between the R phase and the S phase does not affect the T phase, so the pulse is applied to the first sensor CT and the second sensor C t of the T phase. Since no current flows, no signal is generated on the secondary windings of the first sensor CT and the second sensor Ct. Also, the pulse current passing through the shielded wire of the R-phase cable and the S-phase cable Since the pulse current passing through the shield ground wire of the above is opposite in polarity and of the same magnitude, and the pulse current does not flow through the shield ground spring of the T-phase cable, the shield ground of each phase cable is No signal is generated in the secondary winding of the third sensor C, where the wires are collectively the primary spring o
  • the signal of the first sensor is guided to MONITOR via BUFFER (1), and the signals of the second and third sensors are guided to MONITOR via BUFFER (2).
  • deterioration between phases can be detected. That is, the element degradation of the R phase and the S phase shown in FIG. 3 can be determined as follows.
  • the first sensor CR and CS are equal in magnitude and opposite in polar force s
  • the first sensor CT and third sensor C have no signal
  • the first sensor CR and CS are The polarities of the signals of the corresponding phases of the two sensors Cr, Cs, are opposite to each other.
  • Table 1, Table 2, Table 3, and Table 4 show the relationship between the presence / absence of signals from each sensor and the polarity for detection of insulation deterioration between any phases and detection of common mode noise.
  • FIG. 4 shows a case where deterioration occurs between the R phase inside the heating device and the ground.
  • the electric charge is instantaneously discharged from the point X inside the electronic device shown in Fig. 4, and pulse is generated on the power side and the ground side of the point X.
  • the positive pulse charge is generated in the R phase and the negative pulse charge is generated on the ground.
  • the pulse charges are divided into those traveling inside the device and those traveling through the cable.
  • a traveling wave having (+) polarity is generated in the core wire, and a traveling wave having (1) polarity is generated in the shield, and the distribution constant of each cable is generated. It travels along the circuit as a traveling wave.
  • the R-phase first sensor employs traveling waves of (+) polarity and (-) polarity, but the traveling wave of (-) polarity is canceled because it travels through the shield ground wire. Therefore, a (+) polarity signal is obtained on the secondary winding of the first sensor CR.
  • progress caused by ⁇ fi between the R phase and the earth is a cable of the S phase and the ⁇ phase! Since it does not affect ⁇ , no signal is applied to the secondary springs of the S-phase first sensor CS and the ⁇ -phase first sensor C ⁇ .
  • the secondary winding of the R-phase second sensor Cr inserted into the shield earth wire has (1) A polarity signal is obtained. Also, since the pulse current force s ' does not flow through the shield earth wire of the S-phase T-phase cable, the secondary winding of the S-phase and T-phase second sensors Cs and Ct inserted in the shield ground wire There is no signal on the wire. In addition, the pulse current that flows through the shielded ground wire of the R-phase cable is applied to the third sensor C, which is the primary fiber of the shielded ground wire of each phase cable. The secondary winding generates a signal with the same (1) polarity as the R-phase second sensor Cr.
  • the signal of the first sensor is led to MONITOR via BUFFER (1), and the signals of the second and third sensors are led to MONITOR via BUFFER (2).
  • the absolute deterioration between the grounds can be confirmed. That is, the deterioration between the R phase and the ground shown in FIG. 4 can be evaluated as follows.
  • the polarity of the R-phase first sensor CR and the R-phase second sensor Cr should be opposite, and the polarity of the third sensor C should be opposite to the polarity of the first sensor CR.
  • the first sensor CS and CT have no signal, and the second sensor Cs and CU signal have no signal.
  • Fig. 6 shows a so-called Rogowski coil, which is a coil in which a winding is applied to the core of the air core and one end of the winding is returned to the beginning of the winding through the center of the winding.
  • K indicates an air core
  • N 2 indicates a secondary winding
  • L indicates a measured wire such as a cable or a spring
  • this is a primary winding.
  • Fig. 7 shows that in the configuration of Fig. This is a sensor configured by inserting a magnetic core Kl.
  • the method of inserting the magnetic core K1 into a part of the center of the air-core core K may be performed by cutting the magnetic core K1, or the magnetic core K1 may be formed of a cobalt-based material having a square hysteresis ft. Consisting of an amorphous tape: ⁇ can be inserted using the cut part of the air core ⁇ after inserting the air core K into the primary winding.
  • FIG. 8 shows an operation explanatory diagram of the first sensor configured in FIG. P1 in FIG. 8 indicates a core K1 which is generated by a load current in a commercial circuit along the cable L in FIG.
  • the pulse signal S1 can be obtained from the secondary ⁇ 2 of the first sensor at the falling point of ⁇ 1 due to ⁇ ;! ⁇ . Since the magnetic core K1 in FIG. 7 is designed to generate a sum at the negative current i £ S of the commercial frequency flowing through the cable L, the negative of the commercial frequency is obtained by the pulse signal S1 in FIG. Near the zero cross of the shrine style.
  • P2 in Fig. 8 indicates the forward wave current caused by the partial discharge caused by the electrical deterioration of the cable L and the cable.
  • the traveling wave current P 2 can be output as a pulse signal S 2 from the ⁇ c ⁇ N 2 of the first sensor. Therefore, from the zero phase difference between S1 and S2, the phase difference 0 of traveling wave current P2 with respect to the zero cross point of the load current at the commercial frequency can be known.
  • the phase difference of the commercial frequency negative current with respect to the commercial frequency power supply voltage (Vr, Vs, Vt shown in Fig. 1 to Fig. 5) can be known by the existing method of spikes such as a power factor meter.
  • the phase difference (02 not shown) between the phase of EVr, Vs, and Vt and the pulse signal S2 based on the fiber deterioration estimates the state of the deterioration of the fiber, the cause of the deterioration of the fiber, and the deterioration. Important data that can be.
  • phase difference 02 is large in the early stage of the class, and tends to become smaller with the eclipsed fiber.
  • ⁇ in the body 0 2 is in the range of 0 to ⁇ / 2, ⁇ to 3 ⁇ / 2 of the voltage phase, and J3 ⁇ 4
  • the discharging pulse of the same size was measured.
  • ⁇ 2 was «£ ⁇ 0 ⁇ , ⁇ / 2, ⁇ ⁇ 3
  • the pulse distribution is measured so that the discharge pulse is in the range of TC / 2, and the discharge pulse becomes larger to the right as the ⁇ 2 increases.
  • the intensity of the discharge pulse is 5 'large, and when 22 is in the range of voltage phase; r to 2 ⁇ , the intensity of the discharge pulse is small s. From the observations, it is possible to estimate the cause of deterioration by touching the distribution pattern of ⁇ ⁇ Z and the discharge pulse.
  • the intensity of the discharge pulse that is, the amount of discharge charge
  • the phase 2 at which the discharge pulse occurs approaches the zero cross point (0, r, 2) of the 3 ⁇ 4E phase. Since there is a tendency, by measuring the relationship between ⁇ ⁇ 2 and the daughter of the discharge pulse over time, it is possible to estimate the insulation degradation.
  • FIG. 9 shows another configuration example of the first sensor, the second sensor, and the third sensor.
  • a magnetic material having a high magnetic permeability such as a cobalt-based amorphous alloy is applied to the core K of the sensor, and a secondary winding N 2 is provided. Further, in order to adjust the inductance as viewed from the secondary winding N2, the core K may be provided with a vertical spring ⁇ N3> as shown in the figure. A current flows through the short winding N 3 so as to cancel the change in the core K.
  • Such miniature sensors in the configuration, light weight, and so the pulse current can be Teng with high sensitivity, it forces s preferred to apply to the second sensor Oyobi third sensor of the present invention.
  • FIG. 10 shows that a pulse SE ep is obtained from the secondary winding N 2 of the sensor when the traveling wave current i p due to the partial discharge due to the cable U and the deterioration is applied in the configuration of FIG.
  • ep can be obtained as a damped oscillatory wave by attaching an appropriate static capacitance C to the terminal of the secondary winding N2, so that the S / N ratio when there is high-frequency external noise is increased. it can.
  • FIG. 11 shows an electrical equivalent circuit of FIG.
  • L indicates the inductance viewed from the secondary winding N 2
  • R indicates the equivalent resistance viewed from the secondary winding N 2
  • C indicates the floating amount viewed from the secondary winding and the added capacitance And the capacitance added.
  • the ff ⁇ formula for obtaining the attenuation voltage V at the terminal of the secondary winding by the pulse current I passing through the primary side of the sensor is shown below.
  • the frequency »j it is preferable to set the frequency »j to 0.5 to 20 MHz.
  • the calculation formula for obtaining the damped S in wave due to the parasitic electric vibration is as follows: Becomes [Equation 1]
  • V-L (dl / dt) RI
  • I -C (dV / d t)
  • V e x p (mt)
  • V A ⁇ exp [— b + (b 2 -a 2 ) ⁇ 2 ] t ⁇
  • Fig. 2 shows the circuit breaker CB and device M connected by a three-core cable: ⁇ .
  • a ceramic capacitor C0 was connected between the power supply for each phase and the ground, the second sensors Cr, Cs, and Ct were inserted into their ground wires, and then the ground wires for each phase were combined.
  • the same operation as in Example 1 can be obtained by inserting the third sensor C into the ground wire.
  • FIG. 5 shows another example in which the circuit breaker CB and the electronic device M are connected by a three-core cable. That is, the third sensor C is inserted into the shield ground wire of the three-core cable, and the second sensor does not shelf.
  • the electrical equipment and the cable can be deteriorated in a great amount between the grounds, but the deterioration between the phases cannot be made.
  • the configuration is simple, there is a feature that functions can be limited and the size and size can be reduced!
  • the short circuit by the ground fault accident accompanying the progress of the insulation deterioration between the electric coke and the cable ground can be predicted. Since the prediction of the fiber accompanying the progress of the fiber between the two phases can be predicted, the accident can be prevented beforehand by taking appropriate measures.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

Des premiers capteurs (CR, CS, CT), des deuxièmes capteurs (Cr, Cs, Ct) et un troisième capteur (C) sont placés sur les phases respectives d'un câble d'alimentation, sur les lignes de terre des blindages des phases respectives du câble d'alimentation, et sur la ligne à laquelle sont reliées les lignes de terre. On détecte la détérioration de l'isolation du câble d'alimentation en détectant à l'aide des capteurs les courants à ondes progressives produits par la détérioration de l'isolation, en envoyant les signaux de courant dérivant de la détection à un MONITEUR par l'intermédiaire d'un TAMPON (1) et d'un TAMPON (2) et en comparant entre elles les intensités et les polarités des signaux à l'aide du MONITEUR.
PCT/JP1993/000083 1992-01-24 1993-01-22 Procede de prediction de courts-circuits et appareil correspondant WO1993015411A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1144492 1992-01-24
JP4/11444 1992-01-24

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WO1993015411A1 true WO1993015411A1 (fr) 1993-08-05

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0657742A2 (fr) * 1993-11-24 1995-06-14 AT&T Corp. Dispositif de détection d'arcs de défaut dans câbles électriques
JP2000214211A (ja) * 1999-01-26 2000-08-04 Furukawa Electric Co Ltd:The 部分放電判定方法
SG97781A1 (en) * 1998-03-11 2003-08-20 Bicc Gen Uk Cables Ltd Method of and apparatus for detecting cable oversheath faults and installations in which they are used
JP2018059848A (ja) * 2016-10-06 2018-04-12 株式会社日立パワーソリューションズ 回転機診断システムおよびそのデータ処理方法
CN113820623A (zh) * 2021-09-29 2021-12-21 苏州热工研究院有限公司 电缆屏蔽层接地故障的判断方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63113976U (fr) * 1987-01-14 1988-07-22
JPH01217271A (ja) * 1988-02-26 1989-08-30 Mitsui Petrochem Ind Ltd 絶縁状態の検知装置
JPH03128471A (ja) * 1989-07-31 1991-05-31 Mitsui Petrochem Ind Ltd 電気設備の絶縁劣化監視装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63113976U (fr) * 1987-01-14 1988-07-22
JPH01217271A (ja) * 1988-02-26 1989-08-30 Mitsui Petrochem Ind Ltd 絶縁状態の検知装置
JPH03128471A (ja) * 1989-07-31 1991-05-31 Mitsui Petrochem Ind Ltd 電気設備の絶縁劣化監視装置

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0657742A2 (fr) * 1993-11-24 1995-06-14 AT&T Corp. Dispositif de détection d'arcs de défaut dans câbles électriques
EP0657742A3 (fr) * 1993-11-24 1995-08-16 At & T Corp Dispositif de détection d'arcs de défaut dans câbles électriques.
SG97781A1 (en) * 1998-03-11 2003-08-20 Bicc Gen Uk Cables Ltd Method of and apparatus for detecting cable oversheath faults and installations in which they are used
JP2000214211A (ja) * 1999-01-26 2000-08-04 Furukawa Electric Co Ltd:The 部分放電判定方法
JP2018059848A (ja) * 2016-10-06 2018-04-12 株式会社日立パワーソリューションズ 回転機診断システムおよびそのデータ処理方法
CN113820623A (zh) * 2021-09-29 2021-12-21 苏州热工研究院有限公司 电缆屏蔽层接地故障的判断方法
CN113820623B (zh) * 2021-09-29 2023-08-22 苏州热工研究院有限公司 电缆屏蔽层接地故障的判断方法

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