CN104183379A - Connecting device for maintenance of secondary side of electric power current transformer - Google Patents
Connecting device for maintenance of secondary side of electric power current transformer Download PDFInfo
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- CN104183379A CN104183379A CN201410386824.7A CN201410386824A CN104183379A CN 104183379 A CN104183379 A CN 104183379A CN 201410386824 A CN201410386824 A CN 201410386824A CN 104183379 A CN104183379 A CN 104183379A
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Abstract
The invention discloses a connecting device for maintenance of a secondary side of an electric power current transformer. The connecting device comprises a first group of three-phase wiring terminals ABCN, a second group of three-phase wiring terminals A1B1C1N1 and three alternating current amperemeters. The connecting device has the benefits that the connection device for the maintenance of a secondary side of the electric power current transformer is adopted to realize a by-pass effect and to detect the current of the secondary side of the current transformer, the closed CT process is simplified, fault treatment time is shortened, the potential safety hazard of closed CT during secondary circuit live working is eliminated, harm to human body and equipment caused by unnoticed touch of live terminal or working without knowing that whether the CT terminal is sealed well or not is avoided, the device is low in cost, convenient to use, and is suitable for popularization and application.
Description
Technical field
The present invention relates to power industry system relay protection professional skill field; Particularly relate to a kind of power current transformer secondary side repair and maintenance jockey.
Background technology
The effect of the current transformer (Current transformer is called for short CT) that power industry system is used is; can be primary current larger numerical value; be converted to by certain no-load voltage ratio the secondary current that numerical value is less, be used for protecting, measure, the purposes such as maintenance.As no-load voltage ratio be 400/5 current transformer, the electric current that the current transitions that can be 400A reality is 5A.
In the transmission line of generating, power transformation, transmission of electricity, distribution and electricity consumption, electric current is greatly different in size, from several amperes of having to a little Wan An trainings.Need to be converted to more unified electric current for ease of measuring, protect and controlling.In addition, the voltage on circuit is generally all higher, is breakneck if directly measured.Current transformer just plays current transformation and electrical isolation effect.
For pointer ammeter, the secondary current great majority of current transformer are ampere levels, as 5A, 10A, 20A etc.For digital instrumentation, the signal of sampling is generally a milliampere level (0-5V, 4-20mA etc.).Micro-transformer of current secondary current is a milliampere level, mainly plays the function served as bridge between large instrument transformer and sampling.
Current transformer and transformer ' s type seemingly, are also according to electromagnetic induction principle work, transformer conversion be voltage and current transformer conversion be electric current.Current transformer connects the winding (number of turn is N1) of tested electric current, is called winding (or former limit winding, armature winding); The winding (number of turn is N2) that connects measuring instrument is called secondary winding (or secondary winding, secondary winding).
The current ratio of current transformer once winding current I1 and secondary winding I2, is called actual current and compares K.Current ratio when current transformer is worked under rated current is called current transformer rated transformation ratio, represents with Kn.
Kn=I1n/I2n
Current transformer (CT), in electric power system, is widely used in one-shot measurement and voltage protector
Control.When normal work, Current Transformer Secondary side is in approximate short-circuit condition, and output voltage is very low.Be in operation, if secondary winding open circuit, or a winding flows through abnormal current (as lightning current, resonance overcurrent, capacitor charging electric current, inductance starting current etc.), all can produce at secondary side the overvoltage of thousands of volts volts even up to ten thousand.This not only works the mischief to electrical secondary system insulation, also can make the too drastic and scaling loss of instrument transformer, the life security that even jeopardizes staff.Use current mutual inductor overvoltage protector just can effectively prevent because of the Current Transformer Secondary accident causing of opening a way.
At present, along with the requirement to power supply reliability improves, under the condition that the job requirement of some relaying protections does not have a power failure at secondary AC loop, carry out.Especially, in the time that but the urgent defect of processing cannot externally have a power failure, we just need to carry out charged work.First, by the lower terminal sealing of Current Transformer Secondary side protection terminal board dish, then carry out the work of secondary AC loop on terminal board dish.Utilize existing method, in the process of envelope CT, exist CT open circuit, touch the hidden danger such as live terminal by mistake, easily cause device damage and human casualty accident.
Summary of the invention
Technical problem to be solved by this invention is that a kind of power current transformer secondary side repair and maintenance jockey is provided.
The technical solution adopted in the present invention is that a kind of power current transformer secondary side repair and maintenance jockey, comprises, first group of three-phase binding post ABCN, second group of three-phase binding post A1B1C1N1 and three alternating current ammeters; Described first group of three-phase electricity A terminal that joins is electrically connected with the input of the first alternating current ammeter, and described second group of three-phase electricity A1 terminal that joins is electrically connected with the output of the first alternating current ammeter; Described second group of three-phase electricity A2 terminal that joins is electrically connected with the input of the second alternating current ammeter, and described second group of three-phase electricity A2 terminal that joins is electrically connected with the output of the second alternating current ammeter; Described the 3rd group of three-phase electricity A3 terminal that joins is electrically connected with the input of the 3rd alternating current ammeter, and described the 3rd group of three-phase electricity A3 terminal that joins is electrically connected with the output of the 3rd alternating current ammeter; Described first group of three-phase electricity N terminal and described second group of three-phase electricity N1 terminal that joins that joins is electrically connected.
The range of described three alternating current ammeters is 20A.
The invention has the beneficial effects as follows, adopt Current Transformer Secondary side repair and maintenance with jockey bypass and detect Current Transformer Secondary side electric current, simplified sealing CT flow process; Can shorten fault handling time, the potential safety hazard of having sealed CT while having eliminated secondary circuit live line working, avoids because touch live terminal or the injury of work the bring person and equipment in the situation that not knowing whether CT terminal is sealed by mistake; This installation cost is cheap, easy to use, is suitable for applying.
Brief description of the drawings
Fig. 1 is the composition structural representation of the new Current Transformer Secondary side repair and maintenance of this practicality jockey.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
As shown in Figure 1, power current transformer secondary side repair and maintenance jockey of the present invention, comprises, first group of three-phase binding post ABCN, second group of three-phase binding post A1B1C1N1 and three alternating current ammeters;
First group of three-phase electricity A terminal that joins is electrically connected with the input of the first alternating current ammeter, and described second group of three-phase electricity A1 terminal that joins is electrically connected with the output of the first alternating current ammeter;
Second group of three-phase electricity A2 terminal that joins is electrically connected with the input of the second alternating current ammeter, and described second group of three-phase electricity A2 terminal that joins is electrically connected with the output of the second alternating current ammeter;
The 3rd group of three-phase electricity A3 terminal that joins is electrically connected with the input of the 3rd alternating current ammeter, and described the 3rd group of three-phase electricity A3 terminal that joins is electrically connected with the output of the 3rd alternating current ammeter;
First group of three-phase electricity N terminal and described second group of three-phase electricity N1 terminal that joins that joins is electrically connected.
The range of three alternating current ammeters is 20A.
CT jockey of the present invention is made up of the small box of multiply test wire, binding post and ammeter, and in order to dock with the terminal board of variety classes Current Transformer Secondary side, the binding post that matches can be freely changed in the attachment plug of device.In the middle of casing, be connected in series with alternating current ammeter; whether can monitor intuitively Current Transformer Secondary side by table meter information is reliably electrically connected with terminal board; for the fault of processing investigation secondary device; as, the effect of the faults such as liquid crystal display screen cannot show, the damage of protective device AC sampling plate is particularly evident.When the binding post of A, B, C, tetra-CT connecting lines insertion Current Transformer Secondary sides of N; and by after ammeter; this ammeter will have electric current instruction; and now; if ammeter is not indicated; show that CT connecting line and protective device dish lower terminal row do not connect, need to carry out careful malfunction elimination to dish lower terminal row's connecting line.Now can not disconnect CT brace, otherwise will cause the terminal board open circuit of CT, what situation was serious will cause protective device generation malfunction.
The present invention adopts Current Transformer Secondary side repair and maintenance jockey, bypass also detects Current Transformer Secondary side electric current, two groups of ABCN three-phase binding posts are installed in this device both sides, use and connect wire by test, access respectively Current Transformer Secondary side, according to the separate wiring respectively of correspondence, Current Transformer Secondary side is carried out to maintaining.Simplify sealing CT flow process; Can shorten fault handling time, the potential safety hazard of having sealed CT while having eliminated secondary circuit live line working, avoids because touch live terminal or the injury of work the bring person and equipment in the situation that not knowing whether CT terminal is sealed by mistake; This installation cost is cheap, easy to use, is suitable for applying.
It is worthy of note; protection scope of the present invention is not limited to above-mentioned instantiation mode; according to basic fundamental design of the present invention; also can use essentially identical structure; can realize object of the present invention; as long as those of ordinary skill in the art are without process creative work, the execution mode that can associate, all belongs to protection scope of the present invention.
Claims (2)
1. a power current transformer secondary side repair and maintenance jockey, is characterized in that, comprises first group of three-phase binding post ABCN, second group of three-phase binding post A1B1C1N1 and three alternating current ammeters;
Described first group of three-phase electricity A terminal that joins is electrically connected with the input of the first alternating current ammeter, and described second group of three-phase electricity A1 terminal that joins is electrically connected with the output of the first alternating current ammeter;
Described second group of three-phase electricity A2 terminal that joins is electrically connected with the input of the second alternating current ammeter, and described second group of three-phase electricity A2 terminal that joins is electrically connected with the output of the second alternating current ammeter;
Described the 3rd group of three-phase electricity A3 terminal that joins is electrically connected with the input of the 3rd alternating current ammeter, and described the 3rd group of three-phase electricity A3 terminal that joins is electrically connected with the output of the 3rd alternating current ammeter;
Described first group of three-phase electricity N terminal and described second group of three-phase electricity N1 terminal that joins that joins is electrically connected.
2. power current transformer secondary side repair and maintenance jockey according to claim 1, is characterized in that, the range of described three alternating current ammeters is 20A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410386824.7A CN104183379A (en) | 2014-08-07 | 2014-08-07 | Connecting device for maintenance of secondary side of electric power current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410386824.7A CN104183379A (en) | 2014-08-07 | 2014-08-07 | Connecting device for maintenance of secondary side of electric power current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104183379A true CN104183379A (en) | 2014-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410386824.7A Pending CN104183379A (en) | 2014-08-07 | 2014-08-07 | Connecting device for maintenance of secondary side of electric power current transformer |
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| Country | Link |
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| CN (1) | CN104183379A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207167A (en) * | 2015-09-07 | 2015-12-30 | 天津送变电工程公司 | Protection method of CT mistaken sealing preventing protection system |
| 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 |
| CN111740275A (en) * | 2020-06-09 | 2020-10-02 | 国网新疆电力有限公司哈密供电公司 | Open circuit processing device for current secondary circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4196387A (en) * | 1978-04-17 | 1980-04-01 | Tokyo Shibaura Denki Kabushiki Kaisha | Apparatus for measuring output DC current of rectifier devices |
| CN2135872Y (en) * | 1992-08-08 | 1993-06-09 | 赵荣明 | Three-phase balance type single-phase ac supply device |
| CN101164719A (en) * | 2006-10-19 | 2008-04-23 | 天津市天锻压力机有限公司 | Numerically-controlled forging hydraulic press capable of realizing reactive power compensation |
-
2014
- 2014-08-07 CN CN201410386824.7A patent/CN104183379A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4196387A (en) * | 1978-04-17 | 1980-04-01 | Tokyo Shibaura Denki Kabushiki Kaisha | Apparatus for measuring output DC current of rectifier devices |
| CN2135872Y (en) * | 1992-08-08 | 1993-06-09 | 赵荣明 | Three-phase balance type single-phase ac supply device |
| CN101164719A (en) * | 2006-10-19 | 2008-04-23 | 天津市天锻压力机有限公司 | Numerically-controlled forging hydraulic press capable of realizing reactive power compensation |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207167A (en) * | 2015-09-07 | 2015-12-30 | 天津送变电工程公司 | Protection method of CT mistaken sealing preventing protection system |
| CN105207167B (en) * | 2015-09-07 | 2018-03-06 | 天津送变电工程公司 | A kind of guard method of anti-misplacement CT protections system |
| 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 |
| CN111740275A (en) * | 2020-06-09 | 2020-10-02 | 国网新疆电力有限公司哈密供电公司 | Open circuit processing device for current secondary circuit |
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Application publication date: 20141203 |