A kind of cable partial discharge detecting sensorTechnical field
The utility model relates to a kind of pick-up unit of power equipment, particularly relates to a kind of cable partial discharge detecting sensor.
Background technology
Current transformer (currenttransformer is called for short CT), its principle is according to electromagnetic induction principle, is made up of the iron core closed and winding.Its umber of turn is little; go here and there in the circuit needing the electric current measured; therefore it often has whole electric currents of circuit to flow through; Secondary Winding turn ratio is more; be serially connected in measurement instrument and protective loop, operationally, its 2 minor loops are closed to current transformer all the time; therefore the impedance of measurement instrument and protective loop series coil is very little, and the duty of current transformer is close to short circuit.Current transformer plays unsteady flow and electrical isolation effect; it is the sensor that in electric system, the secondary device such as measurement instrument, relay protection obtains electrical primary loop current information; current transformer converts high electric current to low current in proportion; current transformer primary side is connected on primary system, secondary side joint measurement instrument, relay protection etc.
In the circuit of generating, power transformation, transmission of electricity, distribution and electricity consumption, size of current great disparity, has from a few peace to a little Wan An.When measuring the big current of exchange current, measure for ease of secondary instrument and need to be converted to more unified electric current (secondary of domestic rated current mutual inductor is rated for 5A or 1A), voltage in addition on circuit is all higher, is breakneck as directly measured.Current transformer just plays unsteady flow and electrical isolation effect.It is the sensor that in electric system, the secondary device such as measurement instrument, relay protection obtains electrical primary loop current information; current transformer converts high electric current to low current in proportion; current transformer primary side is connected on primary system, secondary side joint measurement instrument, relay protection etc.
But existing current transformer is installed complicated, and insulating property are not ideal enough.Therefore, provide a kind of simple, that insulating property are good current transformer is installed is necessary.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of cable partial discharge detecting sensor, installs complicated, the dissatisfactory problem of insulating property for solving current sensor in prior art.
For achieving the above object and other relevant objects, the utility model provides a kind of cable partial discharge detecting sensor, comprise: two semicircle magnetic catheters that can be spliced into annulus, described magnetic catheter is wound with inductor wire, described two semicircle magnetic catheters are arranged in respective magnetic catheter shell, gemel connection is passed through in the outside of the first end of two magnetic catheter shells, second end realizes being fastened and connected by dismountable hasp lock, form an annulus, signal acquisition process module is also provided with in described magnetic catheter shell, the magnetic catheter shell corresponding with described signal acquisition process module position is also provided with cable connector, signal for signal acquisition process module exports.
As a kind of preferred version of cable partial discharge detecting sensor of the present utility model, in the space between described magnetic catheter shell and magnetic catheter, be filled with epoxy resin.
As a kind of preferred version of cable partial discharge detecting sensor of the present utility model, the two ends of described inductor wire are connected to described signal acquisition module.
As a kind of preferred version of cable partial discharge detecting sensor of the present utility model, described hinge comprises the limited block being individually fixed in two magnetic catheter shell first end, the connecting portion of two limited blocks is provided with the fastening tooth with through hole, fasten after tooth fastens and fixed by coupling shaft, and can with this reference column for axis rotation.
As a kind of preferred version of cable partial discharge detecting sensor of the present utility model, described limited block is fixed on described magnetic catheter shell by screw and the screw being arranged at magnetic catheter shell.
As a kind of preferred version of cable partial discharge detecting sensor of the present utility model, described hasp lock comprises and is fixedly installed on having contact with of one of them magnetic catheter shell second end, and be fixedly installed on the hasp of another magnetic catheter shell second end, to have contact with and hasp realizes removably connecting of magnetic catheter shell second end by described.
As a kind of preferred version of cable partial discharge detecting sensor of the present utility model, described cable connector is fixed on described magnetic catheter shell by screw and the screw that is arranged at magnetic catheter shell.
As a kind of preferred version of cable partial discharge detecting sensor of the present utility model, described magnetic catheter shell is pcb board material.
As mentioned above, cable partial discharge detecting sensor of the present utility model, has following beneficial effect: cable partial discharge detecting sensor voltage isolation capabilities of the present utility model is strong, and insulating property are high.Be applicable to the detection of 20KHz or higher frequency, change as secondary current.Sensitivity of the present utility model can reach 1 volt/peace, by doubling around two circle coil sensitivities.Further, cable partial discharge detecting sensor of the present utility model adopts pcb board to install, easy for installation, is applicable to circuit overload protection, switch feedback, protection cut-out detection load fall.The utility model structure is simple, is with a wide range of applications in electric device maintenance field.
Accompanying drawing explanation
Fig. 1 is shown as the inner structure schematic diagram after the combination of cable partial discharge detecting sensor of the present utility model.
Fig. 2 is shown as the external structure schematic diagram after the combination of cable partial discharge detecting sensor of the present utility model.
Fig. 3 is shown as the inner structure schematic diagram after the unblock of cable partial discharge detecting sensor of the present utility model.
Element numbers explanation
101 magnetic catheters
102 inductor wires
103 magnetic catheter shells
104 hinges
105 hasp locks
106 signal acquisition process modules
107 cable connectors
201 limited blocks
202 coupling shafts
203 have contact with
204 hasps
Embodiment
Below by way of specific instantiation, embodiment of the present utility model is described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present utility model and effect easily.The utility model can also be implemented or be applied by embodiments different in addition, and the every details in this instructions also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present utility model.
Refer to Fig. 1 ~ Fig. 3.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present utility model in a schematic way, then only the assembly relevant with the utility model is shown in diagram but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
As shown in FIG. 1 to 3, the present embodiment provides a kind of cable partial discharge detecting sensor, comprise: two semicircle magnetic catheters 101 that can be spliced into annulus, described magnetic catheter 101 is wound with inductor wire 102, described two semicircle magnetic catheters 101 are arranged in respective magnetic catheter shell 103, the outside of the first end of two magnetic catheter shells 103 is connected by hinge 104, second end is locked 105 realizations by dismountable hasp 204 and is fastened and connected, form an annulus, signal acquisition process module 106 is also provided with in described magnetic catheter shell 103, the magnetic catheter shell 103 corresponding with described signal acquisition process module 106 position is also provided with cable connector 107, signal for signal acquisition process module 106 exports.
Exemplarily, described magnetic catheter shell 103 is pcb board material.The present embodiment adopts pcb board material as magnetic catheter shell 103, has and installs easily, the advantage of quick detachable and high insulating property.
Exemplarily, epoxy resin is filled with in the space between described magnetic catheter shell 103 and magnetic catheter 101.Described epoxy resin can increase insulating property and the water resistance of cable partial discharge detecting sensor greatly, thus improves its security and life-span.
Exemplarily, the two ends of described inductor wire 102 are connected to described signal acquisition module, and in the present embodiment, the number of turn of described inductor wire 102 is two circles, by doubling around two circle coil sensitivities.
As shown in Figure 2, exemplarily, described cable connector 107 is fixed on described magnetic catheter shell 103 by screw and the screw that is arranged at magnetic catheter shell 103.
As shown in Figure 3, exemplarily, described hinge 104 comprises the limited block 201 being individually fixed in two magnetic catheter shell 103 first ends, the connecting portion of two limited blocks 201 is provided with the fastening tooth with through hole, fasten after tooth fastens and fixed by coupling shaft 202, and can with this reference column for axis rotation.
Exemplarily, described limited block 201 is fixed on described magnetic catheter shell 103 by screw and the screw being arranged at magnetic catheter shell 103.
As shown in Figure 3, exemplarily, described hasp 204 lock 105 comprise be fixedly installed on one of them magnetic catheter shell 103 second end have contact with 203, and be fixedly installed on the hasp 204 of another magnetic catheter shell 103 second end, by described have contact with 203 and hasp 204 realize removably connecting of magnetic catheter shell 103 second end.
When detecting, described hasp 204 is locked 105 untie, by two magnetic catheter shells 103 along hinge 104 rotating opening, then described magnetic catheter shell 103 is buckled on cable or other power equipment to be detected, then two magnetic catheter shells 103 are rotated closed along hinge 104, and buckle hasp 204 and lock 105 and just complete installation.Then gathered the Partial discharge signal of cable by described magnetic catheter 101 and inductive coil, and after carrying out amplification process and filtration treatment by described signal acquisition process module 106, by described cable connector 107, signal is exported.
As mentioned above, cable partial discharge detecting sensor of the present utility model, has following beneficial effect: cable partial discharge detecting sensor voltage isolation capabilities of the present utility model is strong, and insulating property are high.Be applicable to the detection of 20KHz or higher frequency, change as secondary current.Sensitivity of the present utility model can reach 1 volt/peace, by doubling around two circle coil sensitivities.Further, cable partial discharge detecting sensor of the present utility model adopts pcb board to install, easy for installation, is applicable to circuit overload protection, switch feedback, protection cut-out detection load fall.The utility model structure is simple, is with a wide range of applications in electric device maintenance field.So the utility model effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all without prejudice under spirit of the present utility model and category, can modify above-described embodiment or changes.Therefore, such as have in art and usually know that the knowledgeable modifies or changes not departing from all equivalences completed under the spirit and technological thought that the utility model discloses, must be contained by claim of the present utility model.