KR20220003860A - Sensor for detecting partial discharge signal and Method for assembling the same - Google Patents

Abstract

Disclosed is a partial discharge signal detection sensor which is easy to calibrate the amount of partial discharge in order to obtain optimal measurement sensitivity suitable for fields. The partial discharge signal detection sensor includes: a magnetic body; a first protective case and a second protective case for mounting the magnetic body therein; and a hinge coupled to the first side of the first protective case and the second protective case to rotate the first protective case and the second protective case.

Description

Sensor for detecting partial discharge signal and Method for assembling the same}

The present invention relates to a discharge signal detection sensor, and more particularly, to an integrated high-sensitivity partial discharge signal detection sensor having a calibration port and an assembly method thereof.

The rate of underground transmission of ultra-high voltage underground transmission lines in the domestic power system is gradually increasing, and the failure of underground transmission cables causes great social and economic damage, such as large-scale blackouts and generation constraint costs. Among the preventive diagnosis methods for ultra-high voltage underground transmission cables, the partial discharge diagnosis method is most effectively used to prevent cable failures, and failure prevention activities have been carried out through partial discharge measurement so far.

In the cable partial discharge diagnosis service, partial discharge measurement (once/year) using portable diagnostic equipment and important lines such as 345kV underground line are diagnosed using an on-line partial discharge system. In order to detect such a cable partial discharge signal, a HFCT (High Frequency Current Transformer) sensor is mainly attached to the cable grounding line or SVL (Sheath Voltage Limiter) in the junction box to detect the partial discharge signal of minute high-frequency components generated inside the cable from the outside. do.

Currently, various types of HFCT sensors from domestic and foreign manufacturers are used for underground cable partial discharge sensors, and high-sensitivity HFCT sensors have been recently expanded to improve partial discharge signal detection performance to improve the reliability of underground cable preventive diagnosis.

Such a high-sensitivity HFCT sensor can be installed at all times, and a ferrite split structure (Split Type) type is widely used as an integrated clamp type fastening method in consideration of maintenance. In the case of the integrated fastening method, in order to indirectly inject a simulated partial discharge signal in the field, it is inconvenient to separate and fasten the fastened HFCT sensor from the monitoring target for a while. The unit of the partial discharge signal size is generally pC (pico-Coulomb) based on the IEC62070 standard.

At the diagnostic site of the underground cable, a calibrator is used to check the discharge amount by comparing the size of the partial discharge generated by the calibrator with the size measured by the Jindang equipment.

The structure of the existing clamp-type HFCT sensor is composed of a metal protective case, a magnetic material (ferrite), and one output port. The output port has a structure in which a closed loop type winding wound on a magnetic material is connected to the signal line of the N type connector and the ground.

In order to carry out the calibration of the HFCT sensor in the field or in the laboratory, the signal of the PD calibrator (simulated partial discharge signal injector) is injected into the HFCT sensor in a closed loop, and the circuit is configured the same as the circuit with 1 winding on the input side. That is, the amount of partial discharge is corrected by injecting the Vin signal on the input side into the electric circuit.

Therefore, in the case of the existing clamp-type HFCT sensor installed in the field, there is a problem in that in order to inject the simulated partial discharge signal, the signal is injected by separating the connection, and the inconvenience of reconnecting after calibration is generated.

In addition, in order to calibrate the operating HFCT sensor and diagnostic system in the field environment, it takes a lot of time to remove and reattach the HFCT sensor, and improvement measures are urgently required.

In addition, as the ultra-high voltage underground cable real-time diagnosis system business continues, it is expected that the work of the operating department will be excessively concentrated on system maintenance/repair/inspection, so a partial discharge detection sensor is required to solve this problem.

1. Korea Patent Publication No. 10-2012-0086516

The present invention has been proposed in order to solve the problems according to the above background art, and it is an object of the present invention to provide a partial discharge signal detection sensor that is easy to calibrate the partial discharge amount in order to obtain optimal measurement sensitivity suitable for the field, and a method for assembling the same. .

Another object of the present invention is to provide an integrated high-sensitivity partial discharge signal detection sensor with a built-in calibration port for easy partial discharge calibration and an assembly method thereof.

The present invention provides a partial discharge signal detection sensor that is easy to calibrate the partial discharge amount in order to achieve the optimal measurement sensitivity suitable for the field in order to achieve the object presented above.

The partial discharge signal detection sensor,

magnetic body;

a first protective case and a second protective case for mounting the magnetic body therein; and

and a hinge coupled to the first side of the first protective case and the second protective case to rotate the first protective case and the second protective case.

In this case, a planar shape is formed on the first side of the first protective case and the second protective case so that the hinge is fastened.

In addition, the partial discharge signal detection sensor, coupled to the other side of the first protective case and the second protective case to lock the first protective case and the second protective case; characterized in that it comprises a do.

In addition, a planar shape is formed on the other side surfaces of the first protective case and the second protective case so that the locking part is fastened.

In addition, a first port is installed on a second side of the first protective case, and a second port for calibration port is installed on a second side of the second protective case.

In addition, the first one side of the first protective case is characterized in that the inclination is formed at a constant angle with the second one side of the first protective case.

In addition, the first one side of the second protective case is characterized in that the inclination is formed at a constant angle with the second one side of the second protective case.

In addition, the first port is an N-type port, and the second port is a Bayonet Neil-Concelman (BNC) type port.

In addition, a BNC connector is coupled to the second port to insulate and separate a ground between the first port and the second port.

In addition, the number of windings in which the first winding connected to the first port winds the outer surface of the magnetic material is one, and the second winding connected to the second port winds the outer surface of the magnetic material is two turns. do it with

In addition, each of the first protective case and the second protective case includes two plates, and the two plates are matched to seat and fix the magnetic body therein.

In addition, the magnetic material is characterized in that it consists of a first sub-magnetic material and a second sub-magnetic material that is a donut shape when matched.

In addition, the two plates are characterized in that the cross-section is ┗┛ shape.

In addition, the lock portion is a ring; And it characterized in that it comprises a hook to which the ring is fastened.

In addition, the material of the magnetic body is characterized in that the ferrite.

In addition, in a state in which the first protective case and the second protective case are coupled, a through hole through which a ground wire is inserted is formed in the center.

On the other hand, another embodiment of the present invention, (a) preparing a first protective case and a second protective case, and a magnetic body; (b) mounting the magnetic body inside the first protective case and the second protective case; and (c) coupling a hinge for rotating the first protective case and the second protective case to first side surfaces of the first protective case and the second protective case. A method of assembling a discharge signal detection sensor is provided.

In addition, the step (c) includes a step of coupling the locking unit 140 for locking the first protective case and the second protective case to the other side surfaces of the first protective case and the second protective case. characterized in that

In addition, the step (c), installing a first port on a second side of the first protective case, and installing a second port for a calibration port on a second side of the second protective case; characterized by including.

According to the present invention, the electrical equivalent circuit is the same as the existing calibration method, and when calibrating the partial discharge detection sensor in the field, a simulated PD (partial discharge) signal calibrator is connected to the calibration port without a separate attachment/detachment operation, and calibration can be performed conveniently. .

In addition, as another effect of the present invention, it is possible to reduce the on-site maintenance/repair/inspection time and relieve the burden of work when using a sensor with a built-in calibration port.

1 is an open perspective view of a partial discharge signal detection sensor according to an embodiment of the present invention.
FIG. 2 is an obstructed perspective view of the partial discharge signal detection sensor shown in FIG. 1 .
3 is a front open perspective view of the partial discharge signal detection sensor shown in FIG. 1 before bolting.
4 is a rear open perspective view of the partial discharge signal detection sensor shown in FIG. 3 before bolting.
5 is a rear perspective view to which the protection case shown in FIG. 4 is fastened before bolting.
6 is an internal perspective view of the partial discharge signal detection sensor shown in FIG. 2 .
7 is a perspective view after a Bayonet Neil-Concelman (BNC) connector is fastened to the partial discharge signal detection sensor shown in FIG. 1 .
8 is a conceptual diagram of an injection test using the partial discharge signal detection sensor shown in FIGS. 1 to 7 .
9 is an equivalent circuit diagram of a partial discharge signal detection sensor according to an embodiment of the present invention.
10 is a conceptual diagram showing a magnetic input / output structure to which a calibration port is added according to an embodiment of the present invention.
11 is a flowchart illustrating an assembly process of a partial discharge signal detection sensor according to an embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing each figure, like reference numerals are used for like elements. Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The term “and/or” includes a combination of a plurality of related listed items or any of a plurality of related listed items.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. shouldn't

Hereinafter, a partial discharge signal detection sensor and an assembly method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is an open perspective view of a partial discharge signal detection sensor 100 according to an embodiment of the present invention. Referring to FIG. 1 , a magnetic body 120 , a first protective case and a second protective case 110a and 110b for mounting the magnetic body 120 therein, and a first protective case and a second protective case 110a and 110b. It may be configured to include a hinge 130 coupled to one side, a locking unit 140 coupled to the other side of the first protective case and the second protective case 110a, 110b, and the like.

A planar shape is formed so that the hinge 130 is fastened to one side of the first and second protective cases 110a and 110b. The hinge 130 may be a hinge or the like.

On the other hand, a planar shape is formed on the other side of the first and second protective cases 110a and 110b so that the locking unit 140 is fastened.

The hinge 130 and the locking part 140 are installed to face each other at 180°. In addition, a circular hole space is formed in the center of the first protective case and the second protective case (110a, 110b). A ground wire (not shown) may be inserted into this circular hole space.

In addition, two ports 150 and 160 are installed on the side surfaces of the first and second protective cases 110a and 110b. The first port 160 may be an N-type port. In addition, the second port 150 may be an insulated Bayonet Neil-Concelman (BNC) port as a calibration port.

The first one side of the first protective case 110a is inclined at a predetermined angle with the second one side of the first protective case 110a. In addition, the first one side of the second protective case 110b is inclined at a predetermined angle with the second one side of the second protective case 110b. Of course, a planar shape is also formed on the second side surface.

FIG. 2 is an obstructed perspective view of the partial discharge signal detection sensor 100 shown in FIG. 1 . Referring to FIG. 2 , when viewed from the front, a hinge 130 , an N-type port, an insulated Bayonet Neil-Concelman (BNC) port, and the like are installed.

3 is a front open perspective view of the partial discharge signal detection sensor 100 shown in FIG. 1 before bolting. Referring to FIG. 3 , the protective cases 110a and 110b have a structure in which two plates are superimposed on top of each other. Of course, a seating groove (not shown) is formed inside the plate so that the magnetic body 120 can be seated therein.

In addition, the coupling of these two plates is made through the bolts (310-1, 310-2, 310-3, 320-1, 320-2, 320-3). The bolts 310-1, 310-2, 310-3, 320-1, 320-2, and 320-3 may be screw bolts. Of course, not a screw bolt, but a normal bolt may be used. In this case, the support bolt may be formed inside the plate. In other words, a through hole through which the bolts 310-1,310-2,310-3,320-1,320-2,320-3 can pass is formed in the first plate, and a thread is formed inside the second plate coupled to the first plate. A support bolt may be formed.

Of course, a method of bonding using an adhesive without using such a bolting method is also possible. As the adhesive, a metal adhesive may be mainly used.

In addition, the hinge 130 is also fastened to the side surfaces of the protection cases 110a and 110b through the bolts 313-1, 313-2, 323-1, and 323-2. Of course, it is also possible to use an adhesive without using such a bolting method.

In addition, the first port 160 is also fastened to the side of the protective case (110a, 110b) by the bolts (312-1, 312-2, 312-3, 312-4). Of course, it is also possible to use an adhesive without using such a bolting method.

In addition, the locking part 140 is also fastened to the side surfaces of the protection cases 110a and 110b by the bolts 311-1 and 311-2. Of course, it is also possible to use an adhesive without using such a bolting method.

4 is a rear open perspective view of the partial discharge signal detection sensor 100 shown in FIG. 3 before bolting. Referring to FIG. 4 , if the bolts 310-1,310-2,310-3,320-1,320-2,320-3 are fastened from the upper surface to the lower surface of the plate based on FIG. 3, the bolts 410-1,410-2,410-3,420-1,420 -2,420-3) from the lower surface of the plate toward the upper surface. Of course, the bolts (310-1, 310-2, 310-3, 320-1, 320-2, 320-3) and the bolts (410-1, 410-2, 410-3, 420-1, 420-2, 420-3) are alternately fastened.

The locking unit 140 is composed of a hook 400 and a hook 401 to which the ring 400 is fastened. The locking hole 401 is fixed to the surface of the protective case through bolts 321-1 and 321-2. In other words, the ring 400 is fastened to the rear end surface of the first protective case 110a by bolts, and the hook 401 is fastened to the rear end surface of the second protective case 110b by the bolts.

5 is a rear perspective view to which the protection cases 110a and 110b shown in FIG. 4 are fastened before the bolting. Referring to FIG. 5 , the plate constituting the protective case, the locking part 140 , the hinge 130 , and the first port 160 are fastened by the bolts shown in FIGS. 2 to 4 . In particular, FIG. 5 shows a state in which the hook 400 of the locking unit 140 is fastened to the locking hole 401 in a state in which the gaping first protective case 110a and the second protective case 110b are closed.

6 is an internal perspective view of the partial discharge signal detection sensor 100 shown in FIG. 2 . Referring to FIG. 6 , the magnetic body 120 includes a first sub-magnetic body and a second sub-magnetic body 621 and 622 that have a donut shape when matched. These sub-magnetic materials 621 and 622 are seated inside the plate 611 . Of course, for this, a seating groove (not shown) is formed in the plate 611 .

That is, the cross section of the plate 611 becomes a ┗┛ shape. A winding 630 is configured in the first sub-magnetic body and the second sub-magnetic body 621 and 622 . Of course, the ends of winding 630 are connected to ports 150 and 160 . In other words, the end of the winding 630 wound around the first sub magnetic body 621 is connected to the first port 160 , and the end of the winding wound around the second sub magnetic body 622 is connected to the second port 150 . do.

7 is a perspective view after the Bayonet Neil-Concelman (BNC) connector 710 is fastened to the partial discharge signal detection sensor 100 shown in FIG. 1 . Referring to FIG. 7 , the first port 160 uses an N-type port in order to minimize attenuation/distortion of the detection signal, and the protective case 110a and the ground of the first port 160 have an equal potential. becomes For this purpose, a metal such as copper, iron, aluminum, or stainless steel is used as a material of the protective cases 110a and 110b.

The second port 150 is a calibration port, and in order to facilitate on-site calibration, a BNC type port is used, and a BNC connector 710 is used to separate the input/output isolation between the first port 160 and the calibration. By insulating and separating the ground between the second ports 150, the signal transmission between the input side and the output side is transmitted only with a magnetic material.

In addition, since the second port 150 has a structure that is normally open, the internal winding 630 may be damaged due to a surge by forming a high impedance, so a BNC short type terminal is used. It can be installed to prevent damage to the windings.

8 is a conceptual diagram of an injection test using the partial discharge signal detection sensor 100 shown in FIGS. 1 to 7 . Referring to FIG. 8 , the ground wire 810 is inserted into the through hole 801 formed in the center of the signal detection sensor 100 . The simulated discharge injector 840 and the first port 160 are connected with a first cable 820 , and the second port 150 and the partial discharge meter 850 are connected with a second cable 830 . Accordingly, when the simulated discharge signal is generated by the simulated discharge injector 840 , a test for measuring the simulated discharge signal by the partial discharge meter 850 is possible. 8 is a shape when the ground wire of the cable penetrates the magnetic ferrite.

9 is an equivalent circuit diagram of the partial discharge signal detection sensor 100 according to an embodiment of the present invention. Referring to FIG. 9 , the primary side has a structure electrically insulated from the secondary side, and the number of turns on the primary side and the number of turns on the primary side are 1:n. Here, R and C are parasitic components for the secondary side conductor. V _in is a simulated discharge voltage value, and V _out is a measured voltage value. L is a value generated as the number of turns (n) of the winding (630 in FIG. 6) is changed. In general, the inductance (L) of an annular solenoid is as follows.

Here, n is the number of turns, S is the cross-sectional area of the magnetic material 120, μ is the magnetic permeability of the magnetic material, and l is the length of the magnetic material.

When the L value increases, the signal of the high frequency component cannot be transmitted to the secondary side, and when the L value is low, the signal of the high frequency component decreases. By the above equation, the inductance component of the secondary output appears in proportion to the magnetic permeability, the number of turns, and the shape of the ferrite.

In order to transmit a signal from the primary side to the secondary side with minimum loss, a material with high magnetic permeability is required, and the commonly used ferrite core reduces eddy current loss and is used in various high-tech electronic industries such as high frequency and high voltage. It can be used in the frequency range up to 50 MHz.

Usually, as a magnetic material, the ferrite core is _{an oxide represented by the formula of MOFe 2 O 3} , where M is a metal such as manganese (Mn), zinc (Zn), nickel (Ni), cobalt (Co), copper (Cu) or magnesium (Mg). Elemental oxides are used.

10 is a conceptual diagram showing a magnetic input / output structure to which a calibration port is added according to an embodiment of the present invention. Referring to FIG. 10 , the first port for calibration 160 makes an output port with the number of windings “1” similar to the second port 150, injecting a signal into the calibration port, and measuring at the output port to be. At this time, the number of windings of the second port 150 is “2”. Here, the number of turns is the number of turns of the winding. The ground of the output port and the ground of the calibration port are electrically separated to configure the same electrical circuit as in FIG. 9 . The calibration signal 1010 flows from the first port 160 to the second port 150 in a clockwise direction.

11 is a flowchart illustrating an assembly process of the partial discharge signal detection sensor 100 according to an embodiment of the present invention. Referring to FIG. 11 , first, the protective cases 110a and 110b and the magnetic body 120 are prepared (step S1110 ).

Thereafter, a coil is wound around the magnetic body 120 to generate a winding 630 (step S1120).

Thereafter, the magnetic body 120 is seated on the protective cases 110a and 110b (step S1130). That is, the magnetic body 120 is inserted and seated in the first plate of the protective cases 110a and 110b, and the second plate is covered.

Thereafter, the hinge 130 , the locking unit 140 , and the port 160 are assembled through bolting (step S1140 ). Of course, it includes the process of connecting the winding 630 to the ports 150 and 160 .

100: partial discharge signal detection sensor
110a, 110b: first and second protective cases
120: magnetic material
130: hinge
140: lock
150: second port
160: first port

Claims (19)

magnetic body 120;
a first protective case and a second protective case for mounting the magnetic body 120 therein (110a, 110b); and
a hinge 130 coupled to a first side surface of the first protective case and the second protective case 110a, 110b to rotate the first protective case and the second protective case 110a, 110b;
Partial discharge signal detection sensor comprising a.
The method of claim 1,
Partial discharge signal detection sensor, characterized in that a planar shape is formed on the first side of the first protective case and the second protective case (110a, 110b) so that the hinge (130) is fastened.
The method of claim 1,
A locking unit 140 coupled to the other side surfaces of the first and second protective cases 110a and 110b to lock the first and second protective cases 110a and 110b. Partial discharge signal detection sensor, characterized in that.
4. The method of claim 3,
The partial discharge signal detection sensor, characterized in that the other side of the first protective case and the second protective case (110a, 110b) is formed in a planar shape so that the locking part (140) is fastened.
4. The method of claim 3,
A first port 160 is installed on a second side of the first protective case 110a, and a second port 150 for a calibration port is installed on a second side of the second protective case 110b. Partial discharge signal detection sensor, characterized in that.
6. The method of claim 5,
The partial discharge signal detection sensor, characterized in that the first one side of the first protective case (110a) is inclined at a predetermined angle with the second one side of the first protective case (110a).
6. The method of claim 5,
The partial discharge signal detection sensor, characterized in that the first one side of the second protective case (110b) is inclined at a constant angle with the second one side of the second protective case (110b).
6. The method of claim 5,
The first port 160 is an N-type port, and the second port 150 is a BNC (Bayonet Neil-Concelman) type port, characterized in that the partial discharge signal detection sensor.
9. The method of claim 8,
Partial discharge signal detection sensor, characterized in that the BNC connector (710) is fastened to the second port (150) to insulate and separate the ground between the first port (160) and the second port (150).
6. The method of claim 5,
The number of windings in which the first winding 630 connected to the first port 160 winds the outer surface of the magnetic body 120 is one,
Partial discharge signal detection sensor, characterized in that the number of turns of the second winding connected to the second port (150) around the outer surface of the magnetic body (120) is two.
The method of claim 1,
The first protective case and the second protective case 110a and 110b each include two plates 611, and the two plates 611 are matched to seat and fix the magnetic body 120 therein. Partial discharge signal detection sensor with
12. The method of claim 11,
The magnetic body 120 is a partial discharge signal detection sensor, characterized in that consisting of a first sub-magnetic material and a second sub-magnetic material (621, 622) that becomes a donut shape when matched.
12. The method of claim 11,
The two plates 611 are partial discharge signal detection sensor, characterized in that the cross section of the ┗┛ shape.
4. The method of claim 3,
The locking unit 140 includes a ring 400; And Partial discharge signal detection sensor, characterized in that it comprises a catch (401) to which the ring (400) is fastened.
The method of claim 1,
Partial discharge signal detection sensor, characterized in that the material of the magnetic body (120) is ferrite.
The method of claim 1,
A partial discharge signal detection sensor, characterized in that a through hole (801) into which a ground wire (810) is inserted is formed in the center in a state in which the first protective case (110a) and the second protective case (110b) are coupled.
(a) preparing the first protective case and the second protective case (110a, 110b), and the magnetic body (120);
(b) mounting the magnetic body 120 inside the first protective case and the second protective case (110a, 110b); and
(c) a hinge 130 for rotating the first protective case and the second protective case 110a, 110b on the first side of the first protective case and the second protective case 110a, 110b bonding;
Assembly method of the partial discharge signal detection sensor comprising a.
18. The method of claim 17,
Step (c) is,
coupling the first protective case and the second protective case (110a, 110b) to the other side of the locking unit 140 for locking the first protective case and the second protective case (110a, 110b); Assembly method of the partial discharge signal detection sensor, characterized in that it comprises.
18. The method of claim 17,
Step (c) is,
A first port 160 is installed on a second side of the first protective case 110a, and a second port 150 for a calibration port is installed on a second side of the second protective case 110b. Step; assembly method of the partial discharge signal detection sensor comprising the.

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