CN207440167U - A kind of transformer transient overvoltage and casing dielectric loss signal synchronous collection device - Google Patents
A kind of transformer transient overvoltage and casing dielectric loss signal synchronous collection device Download PDFInfo
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- CN207440167U CN207440167U CN201721688039.2U CN201721688039U CN207440167U CN 207440167 U CN207440167 U CN 207440167U CN 201721688039 U CN201721688039 U CN 201721688039U CN 207440167 U CN207440167 U CN 207440167U
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- dielectric loss
- transformer
- resistance
- transient overvoltage
- signal
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Abstract
The utility model discloses a kind of transformer transient overvoltage and casing dielectric loss signal synchronous collection device, for solving the technical issues of overvoltage signal acquisition methods based on Transformer Bushing Tap characteristic are difficult to while accurate measuring transformer casing dielectric loss with wider detection frequency band accurate reproduction transient overvoltage characteristic.The utility model embodiment includes：Resistance, transient overvoltage signal picker, dielectric loss sensor and dielectric loss signal picker；One end of resistance is connected with Transformer Bushing Tap, and the other end ground connection of resistance, dielectric loss sensor is installed on the ground wire of resistance；Transient overvoltage signal picker is connected to the both ends of resistance, for gathering transformer transient overvoltage；Dielectric loss signal picker is connected with dielectric loss sensor, for gathering the dielectric loss of bushing shell for transformer.
Description
Technical field
The utility model is related to Operation Condition of Power Transformers detection technique field more particularly to a kind of transformer transient state mistakes
Voltage and casing dielectric loss signal synchronous collection device.
Background technology
Transformer overvoltage is one of the main reason for causing power system accident, and overvoltage time of occurrence is although of short duration,
But due to the characteristics of its peak value is high, waveform is steep and energy is big, serious threat can be caused to insulation of electrical installation.To transient overvoltage
Signal is monitored the real-time capture that can be realized to overvoltage data, provides for crash analysis and arranges according to people is and guided to take
It applies and further improves electric network security.Dielectric dissipation factor is to react the major parameter of bushing shell for transformer state of insulation, to transformation
Device casing dielectric loss is monitored, and can be understood the situation of change of bushing shell for transformer state of insulation in real time, effectively be prevented transformer
The generation of casing failure.
Overvoltage signal acquisition methods based on Transformer Bushing Tap characteristic mainly have two kinds of direct-type and indirect type.Directly
The formula method of connecing is：By concatenating low-voltage arm in Transformer Bushing Tap to obtain voltage signal, direct-type method is believed due to output
It makes an uproar than small, the factors such as the easy tested person loop stray inductance of measurement result and capacitance influence, and due to the addition of low-voltage arm, for becoming
The measurement of depressor casing dielectric loss can cause very big influence.Indirect methods are：Pass through current transformer measuring transformer
The tap current of bottom shielding of bushing, and overvoltage signal is obtained by tap current indirectly.Indirect methods do not change bushing shell for transformer
The electrical structure of body will not influence the measurement of bushing shell for transformer dielectric loss.But since the diversity of over-voltage waveform makes
It is wider to obtain the frequency distribution scope of bottom shielding of bushing tap current, and enough width are not achieved in the detection frequency band of current transformer,
Measurement effect is not good enough.
Therefore, currently can both have wider detection frequency band to the measurement of transient overvoltage signal there is an urgent need for a kind of, it can
Accurate reproduction over-voltage waveform characteristic, the measuring method that the measurement of bushing shell for transformer dielectric loss will not be also impacted, together
When also need to be monitored the dielectric loss of bushing shell for transformer, in order to understand the variation of bushing shell for transformer state of insulation in real time
Situation.
Utility model content
The utility model embodiment provides a kind of transformer transient overvoltage and casing dielectric loss signal synchronous collection
Device solves the overvoltage signal acquisition methods based on Transformer Bushing Tap characteristic and is difficult in accurate measuring transformer casing
The technical issues of while dielectric loss with wider detection frequency band accurate reproduction transient overvoltage characteristic.
A kind of transformer transient overvoltage and casing dielectric loss signal synchronous collection that the utility model embodiment provides
Device, including：
Resistance, transient overvoltage signal picker, dielectric loss sensor and dielectric loss signal picker；
One end of the resistance is connected with Transformer Bushing Tap, the other end ground connection of the resistance, the dielectric loss
Sensor is installed on the ground wire of resistance；
The transient overvoltage signal picker is connected to the both ends of the resistance, excessively electric for gathering transformer transient state
Pressure；
The dielectric loss signal picker is connected with the dielectric loss sensor, for gathering Jie of bushing shell for transformer
Matter is lost；
The resistance value of the resistance is 0.1 ohm.
The transformer transient overvoltage and casing dielectric loss signal synchronous collection device that the utility model embodiment provides,
It further includes：Integrator；
The integrator is connected between the resistance and the transient overvoltage signal picker, for by the resistance
The signals revivification at both ends is transient overvoltage signal.
The transformer transient overvoltage and casing dielectric loss signal synchronous collection device that the utility model embodiment provides,
It further includes：Anti- open-circuit protector；
The anti-open-circuit protector is parallel to the both ends of the resistance, for preventing the resistive-open.
Preferably, one end of the resistance is connected by coaxial cable with the Transformer Bushing Tap.
Preferably, the dielectric loss sensor includes straight-through current transformer.
As can be seen from the above technical solutions, the utility model embodiment has the following advantages：
The utility model is coordinated temporary by connecting a special small resistor of 0.1 ohm at Transformer Bushing Tap
State overvoltage signal collector is 0.1 Europe since the resistance value of resistance is minimum with the overvoltage signal of measuring transformer bottom shielding of bushing
Nurse, temperature drift phenomenon can be neglected, i.e., resistance causes resistance to become as resistance performance duration increases fever
The value of change is minimum, so as to accurate reproduction overvoltage signal, and employs resistance and carries out overvoltage signal measurement, has wider
Detection frequency band, the waveform characteristic of overvoltage can be reduced to the greatest extent.In addition, except can be at Transformer Bushing Tap
It gathers outside transient overvoltage signal, also by being provided with dielectric loss sensor and dielectric loss signal picker, while into
Acquisition of the row to casing dielectric loss signal.It can be real while abnormal signal and the relevance of transformer overvoltage is traced
Now to the real-time monitoring of bushing shell for transformer state of insulation, solve the overvoltage signal based on Transformer Bushing Tap characteristic and obtain
Method is difficult to while accurate measuring transformer casing dielectric loss with wider detection frequency band accurate reproduction transient overvoltage
The technical issues of characteristic.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is that a kind of transformer transient overvoltage that the utility model embodiment provides and casing dielectric loss signal are synchronous
The structure diagram of harvester.
Specific embodiment
The utility model embodiment provides a kind of transformer transient overvoltage and casing dielectric loss signal synchronous collection
Device is difficult to for solving the overvoltage signal acquisition methods based on Transformer Bushing Tap characteristic in accurate measuring transformer set
The technical issues of while pipe dielectric loss with wider detection frequency band accurate reproduction transient overvoltage characteristic.
Referring to Fig. 1, a kind of transformer transient overvoltage and casing dielectric loss that provide for the utility model embodiment
The structure diagram of signal synchronous collection device.
A kind of transformer transient overvoltage and casing dielectric loss signal synchronous collection that the utility model embodiment provides
Device, including：
Resistance 1, transient overvoltage signal picker 2, dielectric loss sensor 3 and dielectric loss signal picker 4；
One end of the resistance 1 is connected with Transformer Bushing Tap 5, the other end ground connection of the resistance 1, the medium damage
Consumption sensor 3 is core-theaded type structure, is installed on the ground wire of resistance 1, one end of the resistance 1 by coaxial cable with it is described
Transformer Bushing Tap 5 connects.
The transient overvoltage signal picker 2 is connected to the both ends of the resistance 1, excessively electric for gathering transformer transient state
Pressure；
The dielectric loss signal picker 4 is connected with the dielectric loss sensor 3, for gathering bushing shell for transformer
Dielectric loss；Further, high-precision may be employed in bushing shell for transformer dielectric loss signal and the core-theaded type electric current of Zero flux is mutual
Sensor obtains, with primary equipment without electrical connection.
The resistance value of the resistance 1 is 0.1 ohm, and platinum can be used and make resistance 1 so that the resistance value of resistance 1 is by resistance
Fever influence minimum, no temperature drift phenomenon, can keep frequency characteristic, compared to traditional overvoltage sampling theorem, possess
Broader detection frequency band, and influenced from factors such as stray inductance, capacitances.And since the resistance value of resistance 1 is minimum, resistance 1 for
The influence of the measurement of transient overvoltage size also can be neglected.
The transformer transient overvoltage and casing dielectric loss signal synchronous collection device that the utility model embodiment provides,
It further includes：Integrator 6.By a high speed integrator be connected to the resistance 1 and the transient overvoltage signal picker 2 it
Between, for being transient overvoltage signal by the signals revivification at 1 both ends of resistance.
Resistance 1 opens a way and Transformer Bushing Tap 5 is impacted in order to prevent, the change that the utility model embodiment provides
Depressor transient overvoltage and casing dielectric loss signal synchronous collection device, further include：Anti- open-circuit protector 7；The anti-open circuit
Protector 7 is parallel to the both ends of the resistance 1, for preventing the resistance 1 from opening a way.Wherein, anti-open-circuit protector 7 is designed at electricity
The both ends of resistance 1 can avoid causing 5 lost territory of Transformer Bushing Tap due to signal cable broken string.
In order to make it easy to understand, below by the transformer transient overvoltage provided the utility model embodiment and casing medium
The specific installation real-time method of loss signal synchronous collection device is described in detail.
(1) under transformer power down mode, 5 signal of Transformer Bushing Tap is led to below transformer using coaxial cable
Vasculum in, and install anti-open-circuit protector 7 additional nearby (because of Transformer Bushing Tap under normal operation at bottom shielding of bushing
5 will be grounded, and the operation of transformer can be impacted after having concatenated resistance 1 and the open circuit of resistance 1, it is therefore desirable to install anti-opens additional
Road protector 7 plays a protective role, and prevents the resistance 1 of access from being impacted after opening a way)；
(2) 0.1 special Ω resistors are concatenated on the signal cable of Transformer Bushing Tap 5, and the two of 1 device of resistance
High speed integrator is concatenated on end；
(3) it is grounded after signal cable being passed through dielectric loss sensor 3；
(4) signal output part of dielectric loss sensor 3 and high speed integrator is respectively connected to dielectric loss signal to adopt
On storage 4 and transient overvoltage signal picker 2, installation is completed.
The utility model is coordinated temporary by connecting a special small resistor of 0.1 ohm at Transformer Bushing Tap
State overvoltage signal collector is 0.1 Europe since the resistance value of resistance is minimum with the overvoltage signal of measuring transformer bottom shielding of bushing
Nurse, temperature drift phenomenon can be neglected, i.e., resistance causes resistance to become as resistance performance duration increases fever
The value of change is minimum, so as to accurate reproduction overvoltage signal, and employs resistance and carries out overvoltage signal measurement, has wider
Detection frequency band, the waveform characteristic of overvoltage can be reduced to the greatest extent.In addition, except can be at Transformer Bushing Tap
It gathers outside transient overvoltage signal, also by being provided with dielectric loss sensor and dielectric loss signal picker, while into
Acquisition of the row to casing dielectric loss signal.It can be real while abnormal signal and the relevance of transformer overvoltage is traced
Now to the real-time monitoring of bushing shell for transformer state of insulation, solve the overvoltage signal based on Transformer Bushing Tap characteristic and obtain
Method is difficult to while accurate measuring transformer casing dielectric loss with wider detection frequency band accurate reproduction transient overvoltage
The technical issues of characteristic.
A kind of transformer transient overvoltage provided by the utility model and casing dielectric loss signal are synchronously adopted above
Acquisition means are described in detail, and for those of ordinary skill in the art, based on the idea of the embodiment of the present invention, are having
There will be changes in body embodiment and application range, in conclusion this specification content should not be construed as to this practicality
New limitation.
Claims (5)
1. a kind of transformer transient overvoltage and casing dielectric loss signal synchronous collection device, which is characterized in that including：
Resistance, transient overvoltage signal picker, dielectric loss sensor and dielectric loss signal picker；
One end of the resistance is connected with Transformer Bushing Tap, the other end ground connection of the resistance, the dielectric loss sensing
Device is installed on the ground wire of the resistance；
The transient overvoltage signal picker is connected to the both ends of the resistance, for gathering transformer transient overvoltage；
The dielectric loss signal picker is connected with the dielectric loss sensor, for gathering the medium of bushing shell for transformer damage
Consumption；
The resistance value of the resistance is 0.1 ohm.
2. transformer transient overvoltage according to claim 1 and casing dielectric loss signal synchronous collection device, special
Sign is, further includes：Integrator；
The integrator is connected between the resistance and the transient overvoltage signal picker, for by the resistance both ends
Signals revivification be transient overvoltage signal.
3. transformer transient overvoltage according to claim 1 and casing dielectric loss signal synchronous collection device, special
Sign is, further includes：Anti- open-circuit protector；
The anti-open-circuit protector is parallel to the both ends of the resistance, for preventing the resistive-open.
4. transformer transient overvoltage according to claim 1 and casing dielectric loss signal synchronous collection device, special
Sign is that one end of the resistance is connected by coaxial cable with the Transformer Bushing Tap.
5. transformer transient overvoltage according to claim 1 and casing dielectric loss signal synchronous collection device, special
Sign is that the dielectric loss sensor includes straight-through current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721688039.2U CN207440167U (en) | 2017-12-07 | 2017-12-07 | A kind of transformer transient overvoltage and casing dielectric loss signal synchronous collection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721688039.2U CN207440167U (en) | 2017-12-07 | 2017-12-07 | A kind of transformer transient overvoltage and casing dielectric loss signal synchronous collection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207440167U true CN207440167U (en) | 2018-06-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721688039.2U Withdrawn - After Issue CN207440167U (en) | 2017-12-07 | 2017-12-07 | A kind of transformer transient overvoltage and casing dielectric loss signal synchronous collection device |
Country Status (1)
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| CN (1) | CN207440167U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831356A (en) * | 2017-12-07 | 2018-03-23 | 广东电网有限责任公司电力科学研究院 | A kind of transformer transient overvoltage and sleeve pipe dielectric loss signal synchronous collection device |
-
2017
- 2017-12-07 CN CN201721688039.2U patent/CN207440167U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831356A (en) * | 2017-12-07 | 2018-03-23 | 广东电网有限责任公司电力科学研究院 | A kind of transformer transient overvoltage and sleeve pipe dielectric loss signal synchronous collection device |
| CN107831356B (en) * | 2017-12-07 | 2023-05-23 | 广东电网有限责任公司电力科学研究院 | Transformer transient overvoltage and sleeve dielectric loss signal synchronous acquisition device |
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