CN113588993A - Device and method for replacing ammeter on line - Google Patents
Device and method for replacing ammeter on line Download PDFInfo
- Publication number
- CN113588993A CN113588993A CN202110648988.2A CN202110648988A CN113588993A CN 113588993 A CN113588993 A CN 113588993A CN 202110648988 A CN202110648988 A CN 202110648988A CN 113588993 A CN113588993 A CN 113588993A
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- China
- Prior art keywords
- ammeter
- crimping terminal
- terminal
- crimping
- current transformer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
Abstract
The utility model discloses a change ampere meter device on line includes: the method comprises the following steps: replacing the ammeter device body and a first crimping terminal and a second crimping terminal connected with the ammeter device body on line; the online replacement ammeter device body comprises a current display device and an alarm device which are connected in series; the first crimping terminal is used for being connected with one end of the display equipment and one end of the alarm equipment respectively, and the second crimping terminal is used for being connected with the other end of the display equipment and the other end of the alarm equipment respectively; the first crimping terminal is also used for connecting one end of a current transformer in an ammeter circuit to be replaced, and the second crimping terminal is also used for connecting the other end of the current transformer; the current loop is converted from parallel connection to series connection, the actual current of the equipment can be measured in real time, the current loop of a fault transmitter or an ammeter is isolated, and open-circuit operation of a current transformer is avoided.
Description
Technical Field
The disclosure belongs to the technical field related to electric power system maintenance, and particularly relates to a device and a method for replacing an ammeter on line.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The current transformer for measuring the current of the electrical equipment does not allow open-circuit operation, and once the current transformer is operated in an open-circuit mode, high-voltage danger is possibly generated to burn the equipment, so that the operation of the current transformer is strictly prevented from being operated in the open-circuit mode; when the field device is not allowed to stop operating, the field device needs to operate continuously for a long time, and an ammeter fault or a current transducer fault can occur; in general, when an ammeter or a transmitter has a fault, the instrument can be replaced only after equipment is stopped in order to prevent the current transformer from being opened; this will have two effects: the remote monitoring system cannot read the current value of the equipment in time, and cannot judge the running state of the equipment and evaluate the influence of the equipment on the system.
Disclosure of Invention
The device and the method can realize online replacement of instrument devices such as an ammeter and a transmitter, realize conversion of a current loop from parallel connection to series connection, measure actual current of the device in real time, isolate the current loop of a fault transmitter or the ammeter and avoid open-circuit operation of a current transformer.
In order to achieve the above object, a first technical solution of the present disclosure is an online ammeter replacing device, and the present disclosure adopts the following technical solutions:
an online replacement ammeter device, comprising: replacing the ammeter device body and a first crimping terminal and a second crimping terminal connected with the ammeter device body on line;
the online replacement ammeter device body comprises a current display device and an alarm device which are connected in series; the first crimping terminal is used for being connected with one end of the display equipment and one end of the alarm equipment respectively, and the second crimping terminal is used for being connected with the other end of the display equipment and the other end of the alarm equipment respectively;
the first crimping terminal is further used for connecting one end of a current transformer in an ammeter circuit to be replaced, and the second crimping terminal is further used for connecting the other end of the current transformer.
Further, a thyristor, a first resistor and a second resistor are connected in series between the first crimping terminal and the second crimping terminal, and an alarm device is connected in parallel to the second resistor.
Further, the silicon controlled rectifier is a bidirectional silicon controlled rectifier.
Further, a bidirectional conducting diode is connected between the first crimping terminal and the controllable silicon.
Further, the current display device is an ammeter, and the alarm device is an audible and visual alarm device.
Further, the first crimp terminal and the second crimp terminal each include a plurality of crimping portions arranged in parallel.
Furthermore, the crimping part is a galvanized copper sheet with two saw-toothed ends.
Furthermore, the saw tooth opening directions of the crimping parts are consistent.
Further, the first crimping terminal and the second crimping terminal are connected with the current transformer in a wire breaking-free mode.
The second technical scheme of the present disclosure is that the online ammeter replacing method adopts the online ammeter replacing device; the content comprises the following steps:
crimping the online replacement ammeter device body with connecting lines at two ends of the current transformer by using the first crimping terminal and the second crimping terminal;
disconnecting the connecting line between the fault ammeter and the current transformer after the current display equipment displays the current;
if the current transformer is open-circuited, the bidirectional conduction diode conducts the bidirectional controllable silicon, and the alarm device detects the voltage on the second resistor and performs sound-light alarm.
Compared with the prior art, the beneficial effect of this disclosure is:
1. the current transformer prevents the problem of overvoltage when the current transformer is opened; the current function of the device can be monitored in real time in the process of replacing the ammeter, the defect that the ammeter cannot be replaced on line at present is overcome, and the method has great popularization value.
2. The crimping part is a galvanized copper sheet with two serrated ends, and the crimping effect of the circuit is guaranteed.
Drawings
The accompanying drawings, which form a part hereof, are included to provide a further understanding of the present embodiments, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the present embodiments and together with the description serve to explain the present embodiments without unduly limiting the present embodiments.
Fig. 1 is a schematic structural diagram of embodiment 1 of the present disclosure;
fig. 2 is a schematic diagram of embodiment 1 of the present disclosure.
Fig. 3 is a schematic diagram of the open-circuit prevention protection principle of embodiment 1 of the present disclosure;
fig. 4 is a schematic structural view of a breakage-free wire crimping terminal according to embodiment 1 of the present disclosure;
fig. 5 is a schematic view of an inner crimping portion of a crimping terminal according to embodiment 1 of the present disclosure.
In the figure, 1, a current transformer; 2. replacing the ammeter device body on line; 2-1, an ammeter; 2-2, alarm equipment; 3. a crimp terminal; 3-1, crimping part.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
This openly avoids under the condition that current transformer opened a way, and the crimping terminal avoids broken line with current transformer wiring to be connected, has the silicon controlled rectifier and switches on and avoid the function of opening a way, is equipped with the ampere meter, can realize safe visual change ampere meter, changer etc..
Example 1:
as shown in fig. 1, this embodiment 1 proposes an online replacement ammeter device, including: replacing an ammeter device body 2 and a crimp terminal 3 connected thereto on-line, the crimp terminal 3 including a first crimp terminal and a second crimp terminal; the online replacement ammeter device body 2 comprises a current display device and an alarm device 2-2 which are connected in series; the first crimping terminal and the second crimping terminal are also connected to both ends of a current transformer 1 in an operating circuit.
The current display device is used for displaying real-time current of a loop in the replacement process of the ammeter, and safe visual operation is achieved.
In the implementation, a power supply module is arranged, an external power supply terminal is reserved, and a 220VAC power supply or a 220VDC power supply can be connected for supplying power to the current display equipment.
As shown in fig. 2, in the present embodiment, a triac D, a first resistor R1 and a second resistor R2 are connected in series between the first crimping terminal and the second crimping terminal, and an alarm device 2-2 is connected in parallel to the second resistor R2; a bidirectional conducting diode C is also connected between the first crimping terminal and the controlled silicon D; preferably, the current display device is an ammeter 2-1, and the alarm device 2-2 is a sound and light alarm device.
In order to prevent the current transformer from being opened in the replacement process of the ammeter, voltages at two ends of the current transformer are detected through the bidirectional thyristor D, and the protection module plays a role in avoiding opening when the voltages exceed the conduction voltage of the thyristor; specifically, as shown in fig. 3, during the positive half-wave, the current flows from a to C to the thyristor D to the first resistor R1 to the second resistor R2, and the voltage drop controls the conduction of the thyristor D; when the voltage of the thyristor D is in a negative half-cycle, the current flows from the point B to the diode and returns to the point A, the thyristor D is controlled to be conducted under the condition that the voltage generated by the diode is reduced by high and low, and therefore the conduction of the thyristor D can be triggered no matter in the positive half-cycle or the negative half-cycle; thereby avoiding open circuit operation of the CT loop.
As shown in fig. 4 and 5, the crimp terminal 3 includes a plurality of crimp portions 3-1 arranged in parallel; the crimping part 3-1 is made of zinc-plated copper metal with two sawtooth-shaped ends and is crimped by screwing a screw when in use; preferably, in this embodiment, the number of the crimping parts 3-1 is 3, and the saw-tooth opening directions of the 3 crimping parts are consistent.
The crimping part 3-1 is made of galvanized copper metal with two sawtooth-shaped ends, when the crimping part is used, the screws are screwed for crimping, the reliable connection between the current transformer connecting wire and the crimping terminal 3 is guaranteed, and the crimping terminal 3 can be adjusted according to the wire diameter of the current transformer connecting wire.
Specifically, 3 sawteeth at two ends of the crimping part 3-1 are reliably welded together through internal connecting lines respectively; a first connecting terminal and a second connecting terminal are arranged on 3 sawteeth at one end of the crimping part 3-1; a first connecting terminal is tightly connected with the protection and measurement ends A and B through screws and 3 sawteeth on the lower side, and a protection alarm loop is accessed; the second connecting terminal is connected with the device body through two wires E and F, and similarly, the connecting wire between the second connecting terminal and the device body is also reliably fixed through a screw and is connected into a measuring loop of an ammeter 2-1.
In this embodiment, the first crimp terminal and the second crimp terminal are connected to the current transformer so as to be free from a broken line.
Example 2:
the embodiment provides a method for replacing an ammeter online, which adopts the device for replacing the ammeter online in the embodiment 1; the content comprises the following steps:
crimping the online replacement ammeter device body with connecting lines at two ends of the current transformer by using the first crimping terminal and the second crimping terminal;
after the current is displayed on the ammeter, disconnecting the connecting line between the fault ammeter and the current transformer;
if the current transformer is open-circuited, the bidirectional conduction diode conducts the bidirectional controllable silicon, and the alarm device detects the voltage on the second resistor and performs sound-light alarm.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and those skilled in the art can make various modifications and variations. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present embodiment should be included in the protection scope of the present embodiment.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (10)
1. An online replacement ammeter device, comprising: replacing the ammeter device body and a first crimping terminal and a second crimping terminal connected with the ammeter device body on line;
the online replacement ammeter device body comprises a current display device and an alarm device which are connected in series; the first crimping terminal is used for being connected with one end of the display equipment and one end of the alarm equipment respectively, and the second crimping terminal is used for being connected with the other end of the display equipment and the other end of the alarm equipment respectively;
the first crimping terminal is further used for connecting one end of a current transformer in an ammeter circuit to be replaced, and the second crimping terminal is further used for connecting the other end of the current transformer.
2. The device for replacing the ammeter on line as claimed in claim 1, wherein a thyristor, a first resistor and a second resistor are connected in series between the first crimping terminal and the second crimping terminal, and an alarm device is connected in parallel to the second resistor.
3. The apparatus of claim 2, wherein the thyristor is a triac.
4. The apparatus of claim 2, wherein a bidirectional diode is further connected between the first voltage connection terminal and the thyristor.
5. The on-line replacing ammeter device as recited in claim 2, wherein said current display device is an ammeter, and said alarm device is an audible and visual alarm device.
6. The on-line replacement ammeter device as claimed in claim 1, wherein each of the first crimp terminal and the second crimp terminal comprises a plurality of crimps arranged in parallel.
7. The device for replacing the ammeter in the online as recited in claim 6, wherein the crimping part is a galvanized copper sheet with both ends thereof being serrated.
8. The device for replacing the ammeter in the online manner as set forth in claim 6, wherein the crimps are formed in a consistent zigzag direction.
9. The on-line replacement ammeter device as claimed in claim 1, wherein said first crimp terminal and said second crimp terminal are connected to said current transformer so as to be free from wire breakage.
10. An online ammeter replacing method, characterized in that the online ammeter replacing device according to any one of claims 1-9 is adopted; the content comprises the following steps:
crimping the online replacement ammeter device body with connecting lines at two ends of the current transformer by using the first crimping terminal and the second crimping terminal;
after the display device displays current, disconnecting the connecting line between the fault ammeter and the current transformer;
if the current transformer is open-circuited, the bidirectional conduction diode conducts the bidirectional controllable silicon, and the alarm device detects the voltage on the second resistor and performs sound-light alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110648988.2A CN113588993A (en) | 2021-06-10 | 2021-06-10 | Device and method for replacing ammeter on line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110648988.2A CN113588993A (en) | 2021-06-10 | 2021-06-10 | Device and method for replacing ammeter on line |
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| Publication Number | Publication Date |
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| CN113588993A true CN113588993A (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110648988.2A Pending CN113588993A (en) | 2021-06-10 | 2021-06-10 | Device and method for replacing ammeter on line |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2087394U (en) * | 1991-04-05 | 1991-10-23 | 刘运中 | Open circuit protector for secondary circuit of current mutual-inductor |
| CN2768267Y (en) * | 2005-02-19 | 2006-03-29 | 中山市富达电气有限公司 | Open-circuit-proof protector for current transformer |
| CN202093972U (en) * | 2011-05-31 | 2011-12-28 | 郑州人造金刚石及制品工程技术研究中心有限公司 | Current transformer with open circuit protection indication |
| CN203479953U (en) * | 2013-10-14 | 2014-03-12 | 国家电网公司 | Alarming device for open circuit of current transformer |
| CN204964738U (en) * | 2015-09-22 | 2016-01-13 | 国网电网公司 | Current transformer secondary circuit precaution device of opening a way |
| CN207516534U (en) * | 2017-12-01 | 2018-06-19 | 国网江西省电力有限公司检修分公司 | A kind of transformer station direct current system punching current transformer, which does not have a power failure, replaces capacity checking device |
| CN109581136A (en) * | 2017-09-29 | 2019-04-05 | 上海宝钢工业技术服务有限公司 | Current loop charges the anti-open circuit set of disjunction and method |
-
2021
- 2021-06-10 CN CN202110648988.2A patent/CN113588993A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2087394U (en) * | 1991-04-05 | 1991-10-23 | 刘运中 | Open circuit protector for secondary circuit of current mutual-inductor |
| CN2768267Y (en) * | 2005-02-19 | 2006-03-29 | 中山市富达电气有限公司 | Open-circuit-proof protector for current transformer |
| CN202093972U (en) * | 2011-05-31 | 2011-12-28 | 郑州人造金刚石及制品工程技术研究中心有限公司 | Current transformer with open circuit protection indication |
| CN203479953U (en) * | 2013-10-14 | 2014-03-12 | 国家电网公司 | Alarming device for open circuit of current transformer |
| CN204964738U (en) * | 2015-09-22 | 2016-01-13 | 国网电网公司 | Current transformer secondary circuit precaution device of opening a way |
| CN109581136A (en) * | 2017-09-29 | 2019-04-05 | 上海宝钢工业技术服务有限公司 | Current loop charges the anti-open circuit set of disjunction and method |
| CN207516534U (en) * | 2017-12-01 | 2018-06-19 | 国网江西省电力有限公司检修分公司 | A kind of transformer station direct current system punching current transformer, which does not have a power failure, replaces capacity checking device |
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