CN203595734U - A 10kV direct connection type high-voltage electric energy meter - Google Patents

A 10kV direct connection type high-voltage electric energy meter Download PDF

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Publication number
CN203595734U
CN203595734U CN201320814368.2U CN201320814368U CN203595734U CN 203595734 U CN203595734 U CN 203595734U CN 201320814368 U CN201320814368 U CN 201320814368U CN 203595734 U CN203595734 U CN 203595734U
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China
Prior art keywords
electronic unit
housing
electric energy
current
metering
Prior art date
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Active
Application number
CN201320814368.2U
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Chinese (zh)
Inventor
徐兵
吴峰
孟翔
刘慧敏
赵颖
夏振超
刘毅
谷海彤
区建斌
徐振华
何保红
林柳清
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanfang Electric Power Group Sci & Tech Dev Co Ltd Guangzhou
Guangzhou Power Supply Bureau Co Ltd
Original Assignee
Nanfang Electric Power Group Sci & Tech Dev Co Ltd Guangzhou
Guangzhou Power Supply Bureau Co Ltd
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Application filed by Nanfang Electric Power Group Sci & Tech Dev Co Ltd Guangzhou, Guangzhou Power Supply Bureau Co Ltd filed Critical Nanfang Electric Power Group Sci & Tech Dev Co Ltd Guangzhou
Priority to CN201320814368.2U priority Critical patent/CN203595734U/en
Application granted granted Critical
Publication of CN203595734U publication Critical patent/CN203595734U/en
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Abstract

The utility model relates to a 10kV direct connection type high-voltage electric energy meter which comprises three current transformers, a metering electronic unit and a hollow housing. Secondary current outputs of the current transformers are electrically connected with current input ends of the metering electronic unit respectively. The current transformers and the metering electronic unit are disposed in the housing respectively. The housing is provided with through holes through which cables can penetrate at positions corresponding to through wire holes of current transformers. Furthermore, electrical connecting lead wires between the current transformers and the metering electronic unit are disposed in the housing. The 10kV direct connection type high-voltage electric energy meter soles a problem that when electric energy metering of big electric power users is conducted through the method of 'high voltage power supply with low-voltage side metering', some illegal users can steal electricity through the secondary outputs of short-circuit current transformers, realizes overall calibration of errors in the current transformers and the metering electronic units, and improves the grade of the detection accuracy.

Description

A kind of 10kV direct access high-voltage electric energy meter
Technical field
The utility model belongs to power measurement technical field, is specifically related to a kind of 10kV direct access high-voltage electric energy meter.
Background technology
China is for general " massive quantity power supply and measurement " or " high for low meter " two kinds of modes that adopt of electric energy metrical charge of larger power user.While adopting " high for low meter " mode, be arranged on low-voltage circuit for the electric energy meter of electric energy metrical, because the load of these power consumers generally can reach hundreds of kVA, at this moment the electric current on low-voltage circuit reaches hundreds of ampere.The maximum measures range of the electric energy meter that China is generally used is at present no more than 100 amperes, for the satisfied needs of measuring can be transformed to the large electric current (as: 200A) on circuit can supply the little electric current (being generally 5A) of measurement by three low-voltage current mutual inductors of installation, the little current signal of the secondary output of low-voltage current mutual inductor is linked into electric energy meter again.This way causes two problems: 1, current transformer and electric energy meter have class of accuracy separately, but while combining work, its error can only be expressed by uncertainty, adopt r.m.s. method, this principle obvious and meterage is disagreed, and measuring accuracy also declines to some extent simultaneously.2, the signal cable of Current Transformer Secondary output is generally all long, and some illegal users carry out stealing by the output of short-circuit current mutual inductor secondary and cause damage to power supply enterprise.
Summary of the invention
The purpose of this utility model is at least one the deficiency overcoming described in above-mentioned prior art, a kind of accurate measurement is provided and avoids the 10kV direct access high-voltage electric energy meter of stealing.
For achieving the above object, the utility model has adopted following technical proposal: a kind of 10kV direct access high-voltage electric energy meter, comprise three current transformers, the housing of metering electronic unit and hollow, the secondary current output terminal of described current transformer is electrically connected with the current input terminal of metering electronic unit respectively, described current transformer and metering electronic unit are arranged on respectively in housing, housing is respectively equipped with in the through wires hole position of the each current transformer of correspondence the through hole that cable can pass, and the electrical connecting wire between current transformer and metering electronic unit is placed in housing.
In such scheme, the electrical connecting wire between current transformer and metering electronic unit is placed in housing, and the secondary current output signal wire of current transformer is sealed, can effectively prevent by the electricity filching behavior of short-circuit current signal conductor; In addition, current transformer becomes components and parts of the present utility model, and the error of current transformer and metering electronic unit can be by piece calibration, and device obtains class of accuracy after error testing.
For the ease of measuring threephase cable, above-mentioned three current transformers are arranged in housing side by side.
In order to realize the measurement of three-phase voltage, above-mentioned housing is provided with four the first connection terminals for voltage input, and four the first connection terminals are electrically connected with the voltage input end of metering electronic unit respectively.
Above-mentioned housing is provided with several the second connection terminals for RS485 communication and electric pulse output, and the second connection terminal is electrically connected with metering electronic unit.
The bottom of above-mentioned housing seals by base plate, after current transformer and metering electronic unit are arranged in housing, directly with base plate sealing, makes to form in housing the cavity of sealing.
The utility model forms entirety by 3 current transformers and metering electronic unit are arranged in the housing of a sealing, and the current signal connection wire between current transformer and metering electronic unit is also placed in housing, realize the sealing of the secondary current output signal wire of current transformer, can effectively prevent by the electricity filching behavior of short-circuit current signal conductor; Current transformer becomes components and parts of device, and the error of current transformer and metering electronic unit can be by piece calibration, and device obtains class of accuracy after error testing.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model electric energy meter.
Fig. 2 is the electrical schematic diagram of the utility model electric energy meter.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.Wherein accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent; For better explanation the following example, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product; To those skilled in the art, in accompanying drawing some known features and explanation thereof may to omit be understandable.
Embodiment
The structural representation of the electric energy meter of the present embodiment as shown in Figure 1, comprise three current transformers 1, the housing 3 of metering electronic unit 2 and hollow, wherein three current transformers 1 are arranged on respectively in the housing 3 of hollow with metering electronic unit 2, and three current transformers 1 are arranged side by side, housing 3 is respectively equipped with through hole 31 in the through wires hole position of the each current transformer 1 of correspondence, when use, 3 through holes 31 pass for the cable of circuit A/B/C phase respectively, the bottom of housing 3 seals by base plate 6, thereby make current transformer 1 and metering electronic unit 2 in the cavity of a sealing.
As shown in Figure 2, the secondary current output terminal of above-mentioned three current transformers 1 is electrically connected with the current input terminal of metering electronic unit 2 by wire respectively, and the electrical connecting wire between current transformer 1 and metering electronic unit 2 is placed in housing 3, can effectively prevent by the electricity filching behavior of the current signal line between short-circuit current mutual inductor 1 and metering electronic unit 2, because current transformer 2 secondary current output terminals are arranged in cavity, so only need very short wire just output signal can be transferred to metering electronic unit 2; Above-mentioned housing 3 is provided with four first connection terminals 4 and several second connection terminals 5, four the first connection terminals 4 are electrically connected with the voltage input end of metering electronic unit 2 respectively, the first connection terminal 4 is for the voltage input of circuit, the measurement of three-phase voltage can be realized, the measurement of power can be realized in conjunction with current data; The second connection terminal 5 is electrically connected with metering electronic unit 2, and the second connection terminal 5 is for RS485 communication and electric pulse output.
When the utility model uses, 3 through holes 31 pass for the cable of circuit A/B/C phase respectively, principle according to current transformer: the electric current on circuit induces current signal by ratio at the secondary of mutual inductor, this current signal Direct Transform is metering electronic unit 2 acceptable weak signals (tens milliamperes are to a hundreds of milliampere).Because the utility model possesses the input of electric current and voltage, therefore coordinate electric current, voltage input signal, metering electronic unit 2 can complete the function of common electric energy meter, as: the measurement of voltage, electric current, power, the metering of electric flux etc.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Although more used the terms such as current transformer, secondary output signal, connection terminal, device body, cavity, metering electronic unit, base plate herein, do not got rid of the possibility that uses other term.Use these terms to be only used to describe more easily and explain essence of the present utility model; They are construed to any additional restriction is all contrary with the utility model spirit.

Claims (5)

1. a 10kV direct access high-voltage electric energy meter, comprise three current transformers and metering electronic unit, the secondary current output terminal of described current transformer is electrically connected with the current input terminal of metering electronic unit respectively, it is characterized in that, also comprise the housing of hollow, described current transformer and metering electronic unit are arranged on respectively in housing, housing is respectively equipped with in the through wires hole position of the each current transformer of correspondence the through hole that cable can pass, and current transformer and the electrical connecting wire of metering between electronic unit are placed in housing.
2. 10kV direct access high-voltage electric energy meter according to claim 1, is characterized in that, described three current transformers are arranged in housing side by side.
3. 10kV direct access high-voltage electric energy meter according to claim 1, is characterized in that, described housing is provided with four the first connection terminals for voltage input, and four the first connection terminals are electrically connected with the voltage input end of metering electronic unit respectively.
4. according to the 10kV direct access high-voltage electric energy meter described in claims 1 to 3 any one, it is characterized in that, described housing is provided with several the second connection terminals for RS485 communication and electric pulse output, and the second connection terminal is electrically connected with metering electronic unit.
5. according to the 10kV direct access high-voltage electric energy meter described in claims 1 to 3 any one, it is characterized in that, the bottom of described housing seals by base plate.
CN201320814368.2U 2013-12-12 2013-12-12 A 10kV direct connection type high-voltage electric energy meter Active CN203595734U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320814368.2U CN203595734U (en) 2013-12-12 2013-12-12 A 10kV direct connection type high-voltage electric energy meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320814368.2U CN203595734U (en) 2013-12-12 2013-12-12 A 10kV direct connection type high-voltage electric energy meter

Publications (1)

Publication Number Publication Date
CN203595734U true CN203595734U (en) 2014-05-14

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Application Number Title Priority Date Filing Date
CN201320814368.2U Active CN203595734U (en) 2013-12-12 2013-12-12 A 10kV direct connection type high-voltage electric energy meter

Country Status (1)

Country Link
CN (1) CN203595734U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109738683A (en) * 2019-01-22 2019-05-10 广东航粤电气有限公司 A kind of communication type current transformer of more open types

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109738683A (en) * 2019-01-22 2019-05-10 广东航粤电气有限公司 A kind of communication type current transformer of more open types

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