CN204347124U - A kind of transformer core and neutral ground current strap electric detection means - Google Patents

A kind of transformer core and neutral ground current strap electric detection means Download PDF

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Publication number
CN204347124U
CN204347124U CN201520010416.1U CN201520010416U CN204347124U CN 204347124 U CN204347124 U CN 204347124U CN 201520010416 U CN201520010416 U CN 201520010416U CN 204347124 U CN204347124 U CN 204347124U
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China
Prior art keywords
converter
operational amplifier
current
unit
transformer core
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CN201520010416.1U
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Chinese (zh)
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黎文安
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Wuhan long open Intelligent Technology Co., Ltd.
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黎文安
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Abstract

The utility model provides a kind of transformer core and neutral ground current strap electric detection means, belong to charged electric power apparatus detection field, effectively can solve the problem that the Open-loop sensors metrical error when the measurement to transformer core and neutral ground electric current is large, closed-loop sensors needs power failure to detect, this device accuracy of detection is high, easy to use, safe and reliable.The technical solution of the utility model comprises testing clamp two, microprocessor unit, A/D converter, D/A converter, the first operational amplifier, the second operational amplifier, controllable constant-current source, LCDs and power module.

Description

A kind of transformer core and neutral ground current strap electric detection means
Technical field
The utility model relates to charged electric power apparatus detection field, is specifically related to a kind of transformer core and neutral ground current strap electric detection means.
Background technology
When power transformer normally runs, iron core must have some reliable grounds, otherwise iron core can produce suspended voltage or multipoint earthing of iron core over the ground and produce heating accident, the safety of serious threat transformer and electrical network.Electric current during iron core single-point grounding is less, and the electric current when multipoint earthing can sharply increase, and the ground current thus detecting transformer can judge whether multipoint earth faults.In addition due to the development of high voltage direct current power transmission and transformation, when the operation of high-voltage dc transmission electric monopole ground return circuit and bipolar off-center operation, the potential difference (PD) of generation can cause transformer to occur DC magnetic bias phenomena.There is DC magnetic biasing in transformer, under improper excitation and large load operation operating mode, easily there is hypersaturated state in transformer core, loss can become greatly, harmonic distortion, transformer produce abnormal vibrations, can cause comprising that winding and self inside transformer securing member unshakable in one's determination occur to loosen, the fault such as distortion and heating unshakable in one's determination time serious.The DC current detecting transformer neutral point can the impact of Timeliness coverage DC magnetic biasing.
Measurement at present for transformer core and neutral ground electric current has employing open-loop current sensor and closed-loop sensors two kinds, and Open-loop sensors is comparatively large for measurement low current error, and closed-loop sensors needs to have a power failure and could install, improper live detection.
Utility model content
The utility model provides a kind of transformer core and neutral ground current strap electric detection means, effectively can solve the problem that the Open-loop sensors metrical error when the measurement to transformer core and neutral ground electric current is large, closed-loop sensors needs power failure to detect, this device accuracy of detection is high, easy to use, safe and reliable.
The technical solution of the utility model is: comprise testing clamp two, microprocessor unit, A/D converter, D/A converter, first operational amplifier, second operational amplifier, controllable constant-current source, LCDs and power module, described A/D converter, D/A converter and LCDs are connected with microprocessor unit, described first operational amplifier is connected with A/D converter with the second operational amplifier, described controllable constant-current source is connected with the second operational amplifier and D/A converter simultaneously, the described testing clamp that often props up is provided with a current signal line and a voltage signal line, described voltage signal line is connected with the first operational amplifier, current signal line is connected with controllable constant-current source, described power module is connected with microprocessor unit, for whole pick-up unit is powered.
As preferably, the battery charging and discharging administrative unit that described power module comprises battery and is connected with battery, described battery charging and discharging administrative unit is connected with microprocessor unit.
As preferably, described microprocessor unit is STM32F103 chip.
The beneficial effects of the utility model are: by special testing clamp, the resistance of grounding flat steel self is utilized to be grounded current measurement, no matter to exchange or direct current all can detect easily, but also can live detection be carried out, have that precision is high, ground esy to use, safe and reliable advantage
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, the structure of the present embodiment comprises two testing clamps, microprocessor unit, A/D converter, D/A converter, first operational amplifier, second operational amplifier, controllable constant-current source, LCDs and power module, microprocessor unit adopts STM32F103 chip, A/D converter, D/A converter and LCDs are connected with microprocessor unit, first operational amplifier is connected with A/D converter with the second operational amplifier, controllable constant-current source is connected with the second operational amplifier and D/A converter simultaneously, often prop up testing clamp and be provided with a current signal line and a voltage signal line, voltage signal line is connected with the first operational amplifier, current signal line is connected with controllable constant-current source, power module is that whole pick-up unit is powered, the battery charging and discharging administrative unit comprising battery and be connected with battery, battery charging and discharging administrative unit is connected with microprocessor unit.
When using this device to carry out live testing, by two test clamps on transformer core or neutral ground band steel, microprocessor unit controls D/A converter and regulates controllable constant-current source to export DC current, because grounding flat steel has certain impedance, the DC current that controllable constant-current source exports superposes generation voltage signal with the original electric current of grounding flat steel, because microprocessor measures the output current of device and the voltage of testing clamp position by A/D converter simultaneously, through the measurement of twice different output current, actual iron core or neutral ground electric current can be calculated by meter.

Claims (3)

1. a transformer core and neutral ground current strap electric detection means, it is characterized in that: comprise testing clamp two, microprocessor unit, A/D converter, D/A converter, first operational amplifier, second operational amplifier, controllable constant-current source, LCDs and power module, described A/D converter, D/A converter and LCDs are connected with microprocessor unit, described first operational amplifier is connected with A/D converter with the second operational amplifier, described controllable constant-current source is connected with the second operational amplifier and D/A converter simultaneously, the described testing clamp that often props up is provided with a current signal line and a voltage signal line, described voltage signal line is connected with the first operational amplifier, current signal line is connected with controllable constant-current source, described power module is connected with microprocessor unit, for whole pick-up unit is powered.
2. pick-up unit according to claim 1, is characterized in that: the battery charging and discharging administrative unit that described power module comprises battery and is connected with battery, and described battery charging and discharging administrative unit is connected with microprocessor unit.
3. pick-up unit according to claim 1, is characterized in that: described microprocessor unit is STM32F103 chip.
CN201520010416.1U 2015-01-08 2015-01-08 A kind of transformer core and neutral ground current strap electric detection means Active CN204347124U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520010416.1U CN204347124U (en) 2015-01-08 2015-01-08 A kind of transformer core and neutral ground current strap electric detection means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520010416.1U CN204347124U (en) 2015-01-08 2015-01-08 A kind of transformer core and neutral ground current strap electric detection means

Publications (1)

Publication Number Publication Date
CN204347124U true CN204347124U (en) 2015-05-20

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CN (1) CN204347124U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107622886A (en) * 2017-10-19 2018-01-23 国网辽宁省电力有限公司铁岭供电公司 The convenient conversion equipment of dry-type transformer shunting switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107622886A (en) * 2017-10-19 2018-01-23 国网辽宁省电力有限公司铁岭供电公司 The convenient conversion equipment of dry-type transformer shunting switch

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C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20181127

Address after: 430074 No. 1, 3rd floor, Pioneer Building, Science Park, Wuhan University, Donghu Development Zone, Wuhan City, Hubei Province

Patentee after: Wuhan long open Intelligent Technology Co., Ltd.

Address before: 430000 room 1, unit 55, H District, Jinxiu Longcheng District, 888, East Lake high tech Development Zone, Wuhan, Hubei, China, 1201

Patentee before: Li Wenan