CN109031178A - A method of it is inconsistent to solve current transformer ratio - Google Patents
A method of it is inconsistent to solve current transformer ratio Download PDFInfo
- Publication number
- CN109031178A CN109031178A CN201811074336.7A CN201811074336A CN109031178A CN 109031178 A CN109031178 A CN 109031178A CN 201811074336 A CN201811074336 A CN 201811074336A CN 109031178 A CN109031178 A CN 109031178A
- Authority
- CN
- China
- Prior art keywords
- current
- transformer
- mutual inductor
- micro
- primary current
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of methods that solution current transformer ratio is inconsistent, are serially connected in a micro-transformer of current in the primary current transformer secondary circuit inconsistent with other two-phase transformer currents when threephase current transformer no-load voltage ratio is inconsistent；The present invention solves the problems, such as that threephase current transformer no-load voltage ratio is inconsistent in the case where not having a power failure or not influencing electricity consumption, improves maintenance efficiency, saves maintenance cost.
Description
Technical field
The invention belongs to power equipments to repair field, especially a kind of to solve the inconsistent method of current transformer ratio.
Background technique
In high and low pressure electrical equipment, the equipment for measuring electric current be unable to do without current transformer, usual current transformer
Secondary current specification generally has 5A and two kinds of 1A, and secondary current is that the mutual inductor usage amount of 5A is at most also most common.Current Mutual Inductance
Device is in the circuit of three-phase alternating current in application, the current transformer ratio of three-phase must select consistent and electric current range to answer
Properly, otherwise, it is easy for keeping the three-phase current of measurement different；It is easy to cause electric protective device cisco unity malfunction；For
The adverse consequences such as electric energy is incorrect of the electric energy meter measurement of electrical energy measurement.Handling the current main method of such problems is exactly to stop
Charged renewal current transformer keeps three-phase mutual inductor ratio consistent, in addition to this has nothing for it.For individual important electricity units,
The more exchange device that has a power failure can break original production plan or even cause centainly to lose and influence, therefore beyond affordability.Although this
The probability that the case where sample occurs in the equipment of high pressure is lower, but in the measurement circuit of voltage electrical equipment, is difficult to avoid.
Main cause is that the frequency of usage of low voltage mutual inductor is higher, makes mistakes in chaos and happens occasionally.Do not having a power failure or is not influencing the feelings of electricity consumption
Under condition, solves the problems, such as that threephase current transformer no-load voltage ratio is inconsistent, be just particularly important.
Summary of the invention
Technical problem solved by the invention is to provide a kind of method that solution current transformer ratio is inconsistent.
The technical solution for realizing the aim of the invention is as follows: a method of solution current transformer ratio is inconsistent, institute
It states method micro-transformer of current is serially connected in primary current transformer secondary circuit；When primary current mutual inductor ratio becomes larger,
Micro-transformer of current substitute access primary current table in parallel, ammeter show correct current data；When primary current mutual inductor ratio
When becoming smaller, the primary current table in primary current transformer secondary circuit is disconnected from primary current transformer secondary circuit, miniature electric current
Mutual inductor replaces primary current transformer secondary circuit to connect with primary current table, and ammeter shows correct current data.
Preferably, correct electric current I1 in the primary current transformer secondary circuit is wrong in primary current transformer secondary circuit
Accidentally electric current I2, the no-load voltage ratio K1 of primary current mutual inductor, the no-load voltage ratio K2 of micro-transformer of current,；When K1 becomes larger, miniature electric current is selected
Mutual inductor ratio K2=I2/ (I1-I2)；When K1 becomes smaller, micro-transformer of current no-load voltage ratio K2=I2/I1 is selected.
Preferably, the micro-transformer of current uses punching mutual inductor.
Compared with prior art, the present invention its remarkable advantage are as follows:
(1) present invention solves the problems, such as that threephase current transformer no-load voltage ratio is inconsistent in the case where not having a power failure or not influencing electricity consumption.
(2) present invention solves the problems, such as threephase current transformer no-load voltage ratio it is inconsistent in only addition one miniature Current Mutual Inductance
Device saves maintenance cost using original ammeter.
Present invention is further described in detail with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is the micro-transformer of current of the invention wiring diagram in primary current transformer secondary circuit.
Working principle diagram when Fig. 2 is micro-transformer of current substitute parallel connection access primary current table.
Working principle when Fig. 3 replaces primary current transformer secondary circuit to connect with primary current table by micro-transformer of current
Figure.
Specific embodiment
In conjunction with Fig. 1, a kind of method that solution current transformer ratio is inconsistent of the invention, is to work as threephase current transformer
When no-load voltage ratio is inconsistent, a micro-transformer of current is serially connected in the primary current mutual inductance inconsistent with other two-phase transformer currents
In device secondary circuit；When primary current mutual inductor ratio becomes larger, micro-transformer of current substitute access primary current table in parallel, original two
Minor loop electric current shows correct current data plus the sum of micro-transformer of current electric current for ammeter；When primary current mutual inductor becomes
When than becoming smaller, the primary current table in primary current transformer secondary circuit is disconnected from primary current transformer secondary circuit, micro electric
Current transformer replaces primary current transformer secondary circuit to connect with primary current table, and ammeter shows correct current data.Primary current
Correct electric current I1 in transformer secondary circuit, false current I2 in primary current transformer secondary circuit, the change of primary current mutual inductor
Than K1, the no-load voltage ratio K2 of micro-transformer of current,；When K1 becomes larger, select micro-transformer of current no-load voltage ratio K2=I2/ (I1-I2)；
When K1 becomes smaller, micro-transformer of current no-load voltage ratio K2=I2/I1 is selected.Micro-transformer of current uses punching mutual inductor, can root
According to the manual punching the number of turns of actual demand.
Further detailed description is done to the present invention below with reference to embodiment:
Embodiment 1
In conjunction with Fig. 2, the no-load voltage ratio of a measuring circuit threephase current transformer should configure 400/5, for some reason, A phase current
The no-load voltage ratio K1 of mutual inductor becomes 500/5.When three-phase circuit electric current is 400A, the secondary current of the mutual inductor of normal separate B and C
Are as follows: I1=400/(400/5)=5A, at this time secondary current I2=400/ (500/5)=4A of A phase current mutual inductor.Therefore secondary electricity
Difference I1-I2=5-4=the 1A, no-load voltage ratio K2=I2/ (I1-I2)=4/1=4 of micro-transformer of current of stream.Since 4/1 mutual inductor is
There is no producer to produce, so, so that it may using the micro mutual inductor of punching 40/5, one time 2 circle of punching realizes 20/5, again
Rate is similarly 4.Current compensation is haved the function that, A phase current mutual inductor secondary current is made to be restored to B, C two-phase secondary current one
The current value of sample.
Embodiment 2
In conjunction with Fig. 3, the no-load voltage ratio of a measuring circuit threephase current transformer should configure 400/5, for some reason, by A phase electricity
The no-load voltage ratio K1 of current transformer installation becomes 300/5.When three-phase circuit electric current is 400A, normally the mutual inductor of separate B and C is secondary
Electric current are as follows: I1=400/(400/5)=5A, at this time secondary current I2=400/ (300/5)=6.666A of A phase current mutual inductor.By
It is bigger than B, C biphase current mutual inductor secondary current always in the secondary current of A phase current mutual inductor.Therefore one K2 of needs=
The micro-transformer of current of I2/5=6.666/5, micro-transformer of current replace original A phase current mutual inductor secondary circuit and original electricity
Flow table connection keeps its secondary current consistent with other normal separate mutual inductor secondary currents.Due to 6.666/5 mutual inductor
It is that no producer produces, so, so that it may using the micro mutual inductor of punching 40/5, one time 6 circle of punching realizes 6.666/
5, have the function that electric current substitutes.
Claims (3)
1. a kind of solve the inconsistent method of current transformer ratio, which is characterized in that the method is by micro-transformer of current
It is serially connected in primary current transformer secondary circuit；When primary current mutual inductor ratio becomes larger, micro-transformer of current substitute is in parallel
Primary current table is accessed, ammeter shows correct current data；When primary current mutual inductor ratio becomes smaller, primary current mutual inductor is secondary
Primary current table in circuit is disconnected from primary current transformer secondary circuit, and micro-transformer of current replaces primary current mutual inductor two
Minor loop is connect with primary current table, and ammeter shows correct current data.
2. solving the inconsistent method of current transformer ratio according to claim 1, which is characterized in that the primary current is mutual
Correct electric current I1 in sensor secondary circuit, false current I2 in primary current transformer secondary circuit, the no-load voltage ratio of primary current mutual inductor
K1, the no-load voltage ratio K2 of micro-transformer of current,；When K1 becomes larger, select micro-transformer of current no-load voltage ratio K2=I2/ (I1-I2)；When
When K1 becomes smaller, micro-transformer of current no-load voltage ratio K2=I2/I1 is selected.
3. solving the inconsistent method of current transformer ratio according to claim 1, which is characterized in that the miniature electric current
Mutual inductor uses punching mutual inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811074336.7A CN109031178A (en) | 2018-09-14 | 2018-09-14 | A method of it is inconsistent to solve current transformer ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811074336.7A CN109031178A (en) | 2018-09-14 | 2018-09-14 | A method of it is inconsistent to solve current transformer ratio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109031178A true CN109031178A (en) | 2018-12-18 |
Family
ID=64621906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811074336.7A Pending CN109031178A (en) | 2018-09-14 | 2018-09-14 | A method of it is inconsistent to solve current transformer ratio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109031178A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86103429A (en) * | 1986-05-23 | 1987-12-30 | 北京电力科学研究所 | Compensator for total errors of electric energy countings |
| CN87202552U (en) * | 1987-02-27 | 1988-09-14 | 彭平 | Adjustable mutual-inductor |
| CN1512524A (en) * | 2002-12-27 | 2004-07-14 | 岷 章 | Changing current ratio of 10KV and higher high-voltage current transformer under live condition |
| CN1713473A (en) * | 2004-06-25 | 2005-12-28 | 许继电气股份有限公司 | Self-adapation method of current mutual inductor variation |
| CN201859771U (en) * | 2010-11-15 | 2011-06-08 | 山东浩特电气有限公司 | High-multiplying-power composite transformation ratio current transformer |
| CN202034226U (en) * | 2011-03-08 | 2011-11-09 | 江苏科兴电器有限公司 | Multi-range standard voltage transformer |
| CN102360857A (en) * | 2011-05-30 | 2012-02-22 | 国网电力科学研究院 | Integrated network distributing transformer with error compensating mutual inductor |
| CN202930201U (en) * | 2012-12-12 | 2013-05-08 | 北京航空航天大学 | Middling pressure outdoor open type adjustable transformation ratio current transformer |
| CN103487687A (en) * | 2013-09-21 | 2014-01-01 | 国网吉林省电力有限公司电力科学研究院 | Nonstandard variable ratio voltage transformer calibrating method |
| CN104076198A (en) * | 2014-07-03 | 2014-10-01 | 国网河南省电力公司平顶山供电公司 | Maximum demand synchronous metering device for primary meter and secondary meter of transformer substation and metering method |
| CN204480880U (en) * | 2015-02-06 | 2015-07-15 | 四川蓝讯宝迩电子科技有限公司 | A kind of straight-through current transformer of polytropic ratio |
| CN108387860A (en) * | 2018-04-03 | 2018-08-10 | 山东浩特电气有限公司 | A kind of electromagnetic current transducer and its error compensating method |
-
2018
- 2018-09-14 CN CN201811074336.7A patent/CN109031178A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86103429A (en) * | 1986-05-23 | 1987-12-30 | 北京电力科学研究所 | Compensator for total errors of electric energy countings |
| CN87202552U (en) * | 1987-02-27 | 1988-09-14 | 彭平 | Adjustable mutual-inductor |
| CN1512524A (en) * | 2002-12-27 | 2004-07-14 | 岷 章 | Changing current ratio of 10KV and higher high-voltage current transformer under live condition |
| CN1713473A (en) * | 2004-06-25 | 2005-12-28 | 许继电气股份有限公司 | Self-adapation method of current mutual inductor variation |
| CN201859771U (en) * | 2010-11-15 | 2011-06-08 | 山东浩特电气有限公司 | High-multiplying-power composite transformation ratio current transformer |
| CN202034226U (en) * | 2011-03-08 | 2011-11-09 | 江苏科兴电器有限公司 | Multi-range standard voltage transformer |
| CN102360857A (en) * | 2011-05-30 | 2012-02-22 | 国网电力科学研究院 | Integrated network distributing transformer with error compensating mutual inductor |
| CN202930201U (en) * | 2012-12-12 | 2013-05-08 | 北京航空航天大学 | Middling pressure outdoor open type adjustable transformation ratio current transformer |
| CN103487687A (en) * | 2013-09-21 | 2014-01-01 | 国网吉林省电力有限公司电力科学研究院 | Nonstandard variable ratio voltage transformer calibrating method |
| CN104076198A (en) * | 2014-07-03 | 2014-10-01 | 国网河南省电力公司平顶山供电公司 | Maximum demand synchronous metering device for primary meter and secondary meter of transformer substation and metering method |
| CN204480880U (en) * | 2015-02-06 | 2015-07-15 | 四川蓝讯宝迩电子科技有限公司 | A kind of straight-through current transformer of polytropic ratio |
| CN108387860A (en) * | 2018-04-03 | 2018-08-10 | 山东浩特电气有限公司 | A kind of electromagnetic current transducer and its error compensating method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102593859A (en) | Three-phase UPQC (Unified Power Quality Controller) topology circuit based on MMC (Multi Media Card) | |
| CN110118885A (en) | Electric energy metering test junction box, target meter replacing method and electric energy metering device | |
| CN200990560Y (en) | Wide voltage range power supply device | |
| CN204179554U (en) | A kind of precision intelligence power distribution cabinet and distribution drawer thereof | |
| CN102647093A (en) | Novel dual power on-load voltage regulation rectifier transformer | |
| CN109031178A (en) | A method of it is inconsistent to solve current transformer ratio | |
| CN108512230A (en) | Voltage drop and undervoltage compensation method and device based on multi-tap transformer | |
| CN108919016A (en) | A kind of voltage dip generator and voltage dip pilot system | |
| CN104808022A (en) | Temperature rise test connection method for three-side combined operation of three-phase three-winding transformer | |
| CN112213555A (en) | Electric energy meter solution method based on high-speed magnetic isolation communication | |
| CN103489599B (en) | A kind of multistage continuous voltage regulating 12 pulsating wave rectifier transformer | |
| CN101576583B (en) | Method for testing voltage ratio of transformer with phase-shifting winding | |
| CN204424071U (en) | A kind of electrical wiring loop of current transformer | |
| CN208189362U (en) | A kind of 400 volts of Open Type Electric Current Mutual Inductor components | |
| CN202586763U (en) | New type dual-power on-load voltage regulating and rectifier transformer | |
| CN208736953U (en) | A kind of voltage dip generator and voltage dip pilot system | |
| CN102290202B (en) | Core-grounding device for multi-frame core transformers | |
| CN201570797U (en) | High-voltage power supply and low-voltage measuring combined switch cabinet | |
| CN208970327U (en) | 24 pulse, 6 subpackage phase-shifting transformer | |
| CN209313436U (en) | A kind of intelligent wide cut capacity and pressure regulating distribution system | |
| CN106569083B (en) | Three-phase power instrument wiring abnormality recognition method | |
| CN205140701U (en) | A tortuous transformer for low voltage network | |
| CN202197013U (en) | Intelligent low-voltage power distribution cabinet | |
| CN216387207U (en) | Multi-meter-position metering circuit | |
| CN204809839U (en) | Electric leakage circuit breaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181218 |