CN215067228U - Relay secondary cable does not have shielding layer route selection device - Google Patents
Relay secondary cable does not have shielding layer route selection device Download PDFInfo
- Publication number
- CN215067228U CN215067228U CN202121487935.9U CN202121487935U CN215067228U CN 215067228 U CN215067228 U CN 215067228U CN 202121487935 U CN202121487935 U CN 202121487935U CN 215067228 U CN215067228 U CN 215067228U
- Authority
- CN
- China
- Prior art keywords
- cable
- metal detection
- clamping piece
- selection device
- voltage source
- Prior art date
- Legal status (The legal status 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 status listed.)
- Active
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model provides a relay secondary cable does not have shielding layer route selection device, include: the device comprises a charge change measuring device, a pulse voltage source, an insulating handle and a metal detection clamping piece. The utility model adopts the design of an equivalent capacitor, the device is small and exquisite in design and convenient to carry; the device utilizes the principle of a parallel capacitor, is simple to use, has high efficiency and low manufacturing cost; when the device is used, the device can be started only by a small voltage, the personal safety of the operation and inspection personnel can be effectively ensured, and the occurrence of accidents is reduced.
Description
Technical Field
The utility model belongs to the technical field of the cable conductor is looked into line equipment, especially, relate to a relay secondary cable does not have shielding layer route selection device.
Background
When the transformer substation is subjected to power failure maintenance, the problems of mistaken entering of live cable interval operation or mistaken cable line selection and the like easily occur, so that large-area power failure is caused, and more seriously, danger is possibly brought to the personal safety of workers. The reasons for the above problems are roughly as follows: firstly, the protection line of transformer substation is numerous, secondly the transformer substation experiences transformation many times, and equipment wiring is complicated, and the circuit diagram is often inconsistent with actual conditions, and thirdly cable pit intermediate layer light is dark, is difficult for distinguishing pencil type.
Patent CN104034993A has disclosed a cable conductor end recognizer, and the device comprises female machine and parasite aircraft, places in the both ends of cable conductor, and when the circuit UNICOM between female machine and the parasite aircraft, the pilot lamp is lighted, and buzzer warning, but the device is bulky usually, and the cost is higher, inconvenient carrying. Patent CN203909198U discloses a relay protection secondary cable special device of looking for a line, is equipped with the battery in the device's the shell, and the shell surface is equipped with cable core terminal, and the battery positive pole is connected to cable core terminal one end, and battery negative pole ground connection, cable core terminal other end connect cable core one end, and the device is long consuming time when looking for a line, and is inefficient.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a secondary relay cable does not have shielding layer route selection device. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
The utility model adopts the following technical scheme:
in some optional embodiments, there is provided a secondary relay cable unshielded layer line selection device, including: the device comprises a charge change measuring device, a pulse voltage source, an insulating handle and a metal detection clamping piece; one end of the pulse voltage source is connected with the cable and applies a low-voltage alternating current to the cable, and the other end of the pulse voltage source is grounded; the metal detection clamping piece is arranged at the end part of the insulation handle, and the metal detection clamping piece is clamped on the outer surface of the cable to serve as a cathode to form a parallel plate capacitor with a shielding layer of the cable; the signal input end of the charge change measuring device is connected with the metal detection clamping piece, and the charge change measuring device comprises: the device comprises a sampling resistor, an amplifier, a resistor R1, a resistor R2, an LED indicator light and a buzzer.
Furthermore, the metal detection clamping piece is connected with one end of the sampling resistor through a connecting wire, and the other end of the sampling resistor is connected with the inverted input end of the amplifier; the non-inverting input end of the amplifier is grounded through a resistor R2; the output end of the amplifier is connected with the LED indicator light and the buzzer in series, is connected with the built-in power supply and is connected with virtual ground.
Further, the voltage value provided by the pulse voltage source for the cable is 5V, 12V or 24V.
Furthermore, the metal detection clamping piece is annular and is made of copper.
Furthermore, the metal detection clamping piece is externally provided with an insulating layer, and the insulating layer is insulated by epoxy resin.
The utility model discloses the beneficial effect who brings: the utility model adopts the design of an equivalent capacitor, the device is small and exquisite in design and convenient to carry; the device utilizes the principle of a parallel capacitor, is simple to use, has high efficiency and low manufacturing cost; when the device is used, the device can be started only by a small voltage, the personal safety of the operation and inspection personnel can be effectively ensured, and the occurrence of accidents is reduced.
Drawings
FIG. 1 is a model diagram of a measuring end of the present invention;
fig. 2 is a schematic diagram of an equivalent parallel plate capacitor formed in accordance with the present invention;
fig. 3 is a schematic structural diagram of the present invention;
fig. 4 is a schematic diagram of the charge variation measuring device of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others.
In some illustrative embodiments, as shown in fig. 1-4, there is provided a screening-free layer selecting device for secondary relay cables, which is used for selecting correct cable lines when replacing secondary relay cables in a substation, and comprises: charge change measuring device 11, pulse voltage source 12, insulated handle 15 and metal detection clip 16.
As shown in fig. 1, the cable line comprises an inner conductor 2, a shielding layer 1 and an outer insulating layer 3 from inside to outside. As shown in fig. 3, one end of the pulse voltage source 2 is connected to the inner conductor 2 of the cable 13, the pulse voltage source 2 applies a low-voltage alternating current to the cable to form an electric field around the cable 13, and the other end of the pulse voltage source 2 is grounded.
The voltage value provided by the pulse voltage source 12 to the cable 13 is 5V, 12V or 24V. Therefore, the pulse voltage source 12 can provide typical voltages, such as 5V, 12V and 24V grade pulses, and the accuracy of measurement is improved.
The metal detection clamping piece 16 is arranged at the end part of the insulating handle 15, and the insulating handle 15 prevents potential safety hazards in the use process. The metal detects the clamping piece 16 centre gripping at the surface of cable conductor, contacts with outer insulating layer 3, and the metal detects the clamping piece 16 and be the annular, and the material is copper, and the area of copper sheet is enough big, can guarantee when different model cables use, can carry out effectual detection. The utility model discloses an identification means when using, with metal detection clamping piece 16 clip the cable conductor, make the two contact, the clamping piece part is drawn forth the charge signal that metal detection clamping piece 16 gathered through the wire. The metal detection clip 16 is connected to a sampling resistor and virtually connected to form a closed circuit. The signal input of the charge change measuring device 11 is connected to the metal detection clip 16, and the charge change measuring device comprises: the circuit comprises a sampling resistor R3, an amplifier, a resistor R1, a resistor R2, an LED indicator lamp 4 and a buzzer 222, wherein when the current formed by the induced charges is detected, the LED indicator lamp 4 is turned on, and the buzzer 222 buzzes, so that the circuit is a correct circuit, otherwise, an error is selected.
The metal detection clamping piece 16 is connected with one end of a sampling resistor R3 through a connecting wire, and the other end of the sampling resistor R3 is connected with the inverting input end of the amplifier; the non-inverting input terminal of the amplifier is grounded through a resistor R2; the output end of the amplifier is connected in series with the LED indicator lamp 4 and the buzzer 222, and is connected with the built-in power supply and is connected with the virtual ground.
When the operation and inspection personnel use the cable, firstly, the pulse voltage source 12 is connected with the cable 13 to provide a low-voltage alternating current for the cable 13 so as to enable the cable to generate an electric field, and the other end of the pulse voltage source 12 is connected with the ground through the grounding wire 14. Then, the secondary cable 13 is clamped by the metal detection clamping piece 16, the metal detection clamping piece 16 and the secondary cable 13 are in the same electric field, the electric field around the cable 13 changes when the pulse voltage source 12 applies alternating current, a parallel plate capacitor 5 is formed between the shielding layer 1 of the cable 13 and the metal detection clamping piece 16, the shielding layer 1 is equivalent to the anode of the parallel plate capacitor, the metal detection clamping piece 16 is equivalent to the cathode of the parallel plate capacitor, and induced charges are generated on the metal detection clamping piece 16 due to the change of the electric field. And finally, connecting a sampling resistor with a virtual ground through a lead, connecting the charge change measuring device 11 with the lead, and judging whether the line selection is correct or not according to whether a lamp on the charge change measuring device 11 is on or not.
The metal detects the outside of clamping piece 16 and sets up insulating layer 6, improves the security, and the insulating layer adopts epoxy to insulate.
The utility model discloses an identification means utilizes the parallel plate condenser that metal detection clamping piece 16 and cable conductor 13 constitute to detect whether there is induction charge to form, carries out the cable conductor and selects. The device adopts the principle that when a conductor is in a changing electric field, under the action of the electric field force, positive and negative charges can appear at two ends of the conductor. The device can realize detecting the optional position of cable conductor, is applicable to environment such as various typical voltage level pulse, different pulse duty cycles, and measuring device comprises sense terminal and display two parts, designs small and exquisite economy, convenient to carry, and is simple to use safety.
The above embodiment is the preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above embodiment, and any other changes, modifications, replacements, combinations, simplifications, equivalent replacement modes, which are not departed from the spirit and principle of the present invention, should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a relay secondary cable does not have shielding layer route selection device which characterized in that includes: the device comprises a charge change measuring device, a pulse voltage source, an insulating handle and a metal detection clamping piece;
one end of the pulse voltage source is connected with the cable and applies a low-voltage alternating current to the cable, and the other end of the pulse voltage source is grounded;
the metal detection clamping piece is arranged at the end part of the insulation handle, and the metal detection clamping piece is clamped on the outer surface of the cable to serve as a cathode to form a parallel plate capacitor with a shielding layer of the cable;
the signal input end of the charge change measuring device is connected with the metal detection clamping piece, and the charge change measuring device comprises: the device comprises a sampling resistor, an amplifier, a resistor R1, a resistor R2, an LED indicator light and a buzzer.
2. The unshielded layer line selection device of a secondary relay cable according to claim 1, wherein said metal detection clip is connected to one end of said sampling resistor through a connection line, and the other end of said sampling resistor is connected to the inverting input terminal of said amplifier; the non-inverting input end of the amplifier is grounded through a resistor R2; the output end of the amplifier is connected with the LED indicator light and the buzzer in series, is connected with the built-in power supply and is connected with virtual ground.
3. The unshielded layer line selection device of claim 2, wherein the voltage value provided by the pulse voltage source to the cable line is 5V, 12V or 24V.
4. The unshielded layer wire selection device of claim 3, wherein said metal detection clip is ring-shaped and made of copper.
5. The unshielded layer wire selection device of a secondary relay cable according to claim 4, wherein an insulating layer is disposed outside the metal detection clamping piece, and the insulating layer is insulated by epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121487935.9U CN215067228U (en) | 2021-07-01 | 2021-07-01 | Relay secondary cable does not have shielding layer route selection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121487935.9U CN215067228U (en) | 2021-07-01 | 2021-07-01 | Relay secondary cable does not have shielding layer route selection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215067228U true CN215067228U (en) | 2021-12-07 |
Family
ID=79227330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121487935.9U Active CN215067228U (en) | 2021-07-01 | 2021-07-01 | Relay secondary cable does not have shielding layer route selection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215067228U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933753A (en) * | 2021-09-19 | 2022-01-14 | 国网江苏省电力有限公司检修分公司 | Device for distinguishing secondary circuit of transformer substation and identifying cable |
-
2021
- 2021-07-01 CN CN202121487935.9U patent/CN215067228U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933753A (en) * | 2021-09-19 | 2022-01-14 | 国网江苏省电力有限公司检修分公司 | Device for distinguishing secondary circuit of transformer substation and identifying cable |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101825657B (en) | Medium-high voltage single-core crosslinked cable induction voltage and circular-current online detection method and device | |
| CN215067228U (en) | Relay secondary cable does not have shielding layer route selection device | |
| CN205427102U (en) | Current transformer polarity high speed tester | |
| CN103412179A (en) | Charge indicator of high-voltage power transmission line | |
| CN106841810A (en) | Insulator detector | |
| CN203929989U (en) | A kind of insulation testing device for electric automobile based on current monitoring | |
| CN201133923Y (en) | Kinetic cell short circuit checking machine | |
| CN209311572U (en) | A kind of electric automobile insulation resistance detecting circuit based on Injection Signal | |
| CN203672957U (en) | Non-contact test pencil | |
| CN210199238U (en) | Intelligent sensor integrating monitoring of leakage current and partial discharge of sleeve | |
| CN103675389A (en) | Alternating-current and direct-current dual-purpose voltage transformer | |
| CN210657142U (en) | Transformer substation grounding device cathodic protection potential detection system | |
| CN205539154U (en) | High voltage electrified display locking apparatus | |
| CN104793037A (en) | Portable detector for high-voltage cable | |
| CN110058072A (en) | A kind of electroscope with contact detection | |
| CN104034157A (en) | Runout alarm circuit of crucible electric induction furnace | |
| CN212083530U (en) | Improved high-voltage electroscope | |
| CN206818792U (en) | Low voltage motor insulating resistor detecting circuit | |
| CN203350346U (en) | Potential indicator with temperature measuring function | |
| CN110656335A (en) | Transformer substation grounding device cathode protection potential detection system and detection method thereof | |
| CN207114686U (en) | A kind of rack direct current reserves the test fixture of line | |
| CN205484518U (en) | Arc voltage signal detection circuit of block terminal | |
| CN202661583U (en) | Portable device for lively measuring electrical defects of high-voltage insulator | |
| CN201181313Y (en) | High voltage live display device | |
| CN219799736U (en) | Circuit for detecting polarity of current transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |