Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G15/00—Cable fittings
  • H02G15/02—Cable terminations
  • H02G15/06—Cable terminating boxes, frames or other structures
  • H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
  • H02G15/068—Cable terminating boxes, frames or other structures with devices for relieving electrical stress connected to the cable shield only
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
  • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
  • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
  • G01R15/142—Arrangements for simultaneous measurements of several parameters employing techniques covered by groups G01R15/14 - G01R15/26
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
  • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
  • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
  • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
  • G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G15/00—Cable fittings
  • H02G15/02—Cable terminations
  • H02G15/06—Cable terminating boxes, frames or other structures
  • H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
  • H02G15/072—Cable terminating boxes, frames or other structures with devices for relieving electrical stress of the condenser type

Definitions

• the invention relates to a sensor device for high-voltage conductors with an electrically insulating, for enclosing
• the carrier which is provided on its side facing the cable with an electrically conductive layer which forms both an electrode as a capacitive voltage sensor and a field control electrode.
• the side of the carrier facing away from the cable forms a cylindrical seat for the coil housing of a ring current transformer, the winding of which lies in this coil housing.
• the invention is therefore based on the object of providing a sensor device of the type mentioned at the outset, which is less expensive than the known sensor device and in particular can also be designed to be more space-saving. This object is achieved by a sensor device with the features of claim 1.
• the electrode is formed by the turns of the coil in the sensor device according to the invention, the space requirement is reduced to that of the carrier.
• the solution according to the invention is advantageous because only a single sensor is required. This can also save costs.
• the solution according to the invention makes potential-free processing of the current signal necessary. However, this requirement can be met without any problems.
• the coil could also be constructed in multiple layers.
• the turns form a single-layer Rogowski coil with a coil cross section that is equal to the cross section of the carrier.
• Windings of the coil are all on the surface of the carrier, since this is particularly advantageous for manufacturing reasons. Furthermore, any desired cross-sectional shape of the Rogowski coil can be easily realized, since only a corresponding cross-sectional shape needs to be given to the carrier.
• the carrier can also consist of an inelastic insulating material.
• an elastically deformable material is significantly more advantageous, since then expansions, such as those that occur due to thermal loads, can be carried out or the carrier can also be placed in the expanded state on a component to which it is then fixed by its prestress.
• the turns of the coil are preferably formed from a semiconducting or conductive layer which is applied to the surface of the carrier and is expediently also elastic.
• the use of silicone rubber for the support and also for the conductive layer is particularly advantageous. Silicone rubber is very aging-resistant and has a high electrical insulation and sealing ability.
• the electrode can also effect the field control or cooperate in the field control.
• the electrode only needs to be given the shape of a field control electrode, which is readily possible because such a shape does not have a disadvantageous effect on the function as a voltage sensor and as a current sensor. In this case, the turns have a triple function.
• the sensor device according to the invention is to be assigned to a cable connector for medium-voltage or high-voltage cables, it is preferably arranged in the insulating body of the cable connector concentrically with its through-channel. It is particularly advantageous to provide the electrode formed by the windings in addition to an electrode which serves only for field control and to arrange it in such a way that the two electrodes which are insulated from one another jointly form the funnel required for field control.
• the sensor device according to the invention can also be used exposed. In this case, however, it is generally advisable to completely cover the turns lying on the surface of the carrier, for example to cover them with a layer of silicone rubber, so that the turns are not exposed to external influences. The turns are then completely embedded in the insulating material.
• the carrier is made of silicone rubber, increase the tracking resistance of the sensor device supporting body, for example the insulator of a cable termination, not reduced. You can even increase the tracking resistance with the help of the sensor device, since suitable approaches, such as screen rings or drip edges, can be molded onto the layer covering the turns.
• 1 is a longitudinal section of a first embodiment and a cable connector containing this embodiment
• Fig. 2 shows a perspective and enlarged
• Fig. 3 is a simplified circuit diagram of the first
• Fig. 4 shows a second embodiment shown in section, which is placed on a cable end closure shown in view.
• a cable connector for an insulated power supply cable of a medium-voltage network has an insulating body 1 made of silicone rubber, which has a central through-channel for the stripped end section of the cable.
• the insulating body 1 is therefore in the assembled state with radial prestress on the plastic insulation enveloping the cable core electrically tight.
• the conical outer surface of the insulating body 1 is, when the cable connector is inserted into the associated socket, on the inner wall of the electrically insulating socket body 2 and thereby seals the access to the contact socket 2 'of the socket, which is contacted by the contact body 3 of the cable connector.
• a ring-shaped carrier body 4 which opens in a funnel shape towards the contact body 3, is embedded.
• the surface of the carrier body 4 is covered with a thin layer 5 of electrically conductive silicone rubber, which was applied before the embedding in the insulating body 1.
• This layer 5 is used for field control and contacts the conductive layer 6 of the cable which is at earth potential and which has been removed from here to the end of the cable before the insulating body 1 is pushed on.
• the sensor device 7 has a ring-like carrier 8 which, like the carrier body 4, is made of electrically insulating silicone rubber and has a shape which corresponds to a is disproportionately widened towards the contact body 3 towards the socket with strongly rounded ends.
• the inner surface of the carrier 8 facing the cable continues the funnel defined by the layer 5 against the contact body 3, in such a way that an optimal funnel shape is formed for field control.
• An electrically conductive layer made of silicone rubber is applied to the surface of the carrier 8, but does not completely cover the surface of the carrier 8, but consists of the turns 9 'of a single-layer Rogowski coil 9.
• the space between the turns 9 ' is designated by 10 in FIG. 2.
• the Rogowski coil 9 has the same cross-sectional shape as the carrier 8 in that its windings 9 'are formed by a conductive layer applied to the surface of the carrier 8
• Circumferential direction of the carrier 8 over its entire circumference.
• the carrier 8 is provided with a helical annular groove, the course of which follows the course of the
• the Rogowski coil 9 not only forms a current sensor for the current flowing in the cable, but also a capacitive voltage sensor, from which, as a result of the capacitive coupling to the cable core, a signal can be obtained which corresponds to the voltage that the cable carries.
• the gaps 10 practically do not influence the capacitance between the electrode formed by the windings 9 'and the cable core. It is therefore no problem to generate a standardized voltage signal.
• Two connecting conductors 11, which are only shown in FIG. 3, are led out of the insulating body 1 from the beginning and end of the Rogowski coil 9 and are preferably connected here to a socket, not shown, into which a plug can be inserted from the outside. As shown in FIG.
• an evaluation circuit for the current signal is connected to the two connecting lines 11, which is symbolically represented in FIG. 3 by an ammeter 12.
• An evaluation circuit for the voltage signal is connected to the one connecting line 11 and is connected to ground potential on the other hand. This evaluation circuit is symbolically represented in FIG. 3 by a voltmeter 13. Because of the evaluation device for the voltage signal, which is connected to ground potential, it is important that the evaluation of the current signal is potential-free.
• the turns 9 'of the Rogowski coil 9 not only form a current sensor and a voltage sensor. Together with the layer 5 of the carrier body 4, they also form the field control electrode. It is not a problem that the windings 9 'are not at ground potential like the layer 5, since the potential of the windings 9' is only in the order of 100 volts above zero potential.
• the exemplary embodiment shown in FIG. 4 shows, using the example of a cable end closure denoted by 114, that the sensor device according to the invention can also be designed as a separate component and can also be placed on the outside of a fitting or the like.
• the sensor device 107 of the second exemplary embodiment differs from the exemplary embodiment according to FIGS. 1 to 3 only in that the carrier 108 has the shape of a cylindrical socket with rounded ends and that the turns 109 'of the Rogowski coil 109 have a protective layer 115 electrically insulating silicone rubber are completely covered. Since the protective layer 115 completely envelops the carrier 108, the turns 109 'are completely embedded in electrically insulating silicone rubber.
• the sensor device 107 forms an elastically stretchable
• the sensor device 107 is positioned so that it surrounds a portion of the cable that is shield-free. Thanks to the radial preload caused by the widening and the good adhesion of silicone rubber, there is no risk that the sensor device
• the connecting conductors connected and led out to the beginning and end of the Rogowski coil 109, to which the evaluation circuits for the voltage signal and the current signal are connected, are designated by 111.
• FIG. 4 indicates that shield elements 117 or drip edges can be formed on the protective layer 115, by means of which the tracking resistance can be increased even though it is not reduced by the sensor device 107.
• the exemplary embodiment according to FIG. 4 shows that the sensor device according to the invention is also particularly suitable for retrofitting.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6437703

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (17)

Citations (6)

• 1991
  • 1991-08-03 DE DE19914125856 patent/DE4125856C1/de not_active Expired - Lifetime
• 1992
  • 1992-07-18 EP EP92916020A patent/EP0605435A1/de not_active Withdrawn
  • 1992-07-18 WO PCT/EP1992/001644 patent/WO1993003528A1/de not_active Application Discontinuation

Patent Citations (6)

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