CN202837407U - Capacitive equipment and lightning arrester medium loss live line measuring device - Google Patents
Capacitive equipment and lightning arrester medium loss live line measuring device Download PDFInfo
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- CN202837407U CN202837407U CN 201220251434 CN201220251434U CN202837407U CN 202837407 U CN202837407 U CN 202837407U CN 201220251434 CN201220251434 CN 201220251434 CN 201220251434 U CN201220251434 U CN 201220251434U CN 202837407 U CN202837407 U CN 202837407U
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- lightning arrester
- module
- sampling unit
- live line
- dielectric loss
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Abstract
The utility model discloses a capacitive equipment and lightning arrester medium loss live-line measuring device. The capacitive equipment and lightning arrester medium loss live-line measuring device comprises a sampling unit and a test host computer, wherein the sampling unit is connected with the test host computer through test line, the sampling unit is internally provided with signal input modules, the test host computer is internally provided with protection modules, a central processing module and a power supply module, and the central processing module comprises a signal conditioning sub-module and a central processing sub-module. The capacitive equipment and lightning arrester medium loss live-line measuring device can take the place of an original on-line monitoring mode which requires relatively larger investment cost, realizes regular detection for electrical equipment in operation, discovers insulation defects timely and prolongs a power failure pre-test period.
Description
Technical field
The utility model relates to the power technology field, especially relates to a kind of capacitive apparatus and lightning arrester dielectric loss live line measurement device.
Background technology
In high voltage device of transformer station, the quantity of capacitive apparatus such as sleeve pipe, CT, CVT etc. accounts for 40%～50%, and the insulating property of himself are the important technology indexs that are related to the device context safe operation.The insulation degradation of capacitive apparatus is the process of a gradual change, if can not in time find and overhaul, just may cause device fails and then cause catastrophic discontinuityfailure, causes huge direct, indirect economic loss.
For preventing the generation of this type of serious accident, the traditional method that adopts at present is behind putting equipment in service, regularly has a power failure and carries out preventive trial and maintenance, in order in time detect the insulation defect of device interior.But the test condition of power failure preventive trial and running status differ larger, therefore be difficult for correctly diagnosing out the insulation status of high-tension apparatus under ruuning situation, more be difficult to find the defective that develops between twice preventive trial interval, this will directly have influence on the test effect of preventive trial.Along with the development of national economy, the whole society is more and more higher with the requirement that reduces power off time to the reliability of electric power supply simultaneously; Developing gradually of electric system scale, traditional regular power failure preventive trial is owing to exist time-consuming, effort and many drawbacks such as test effect is undesirable and obviously can not satisfy the requirement of power grid security, reliable and efficient operation, therefore electric equipment operation is implemented automatic monitoring and insulation status on-line monitoring, detect, realize that repair based on condition of component has become the inevitable development direction of following high-tension apparatus test.
The converting station high voltage electrical apparatus insulation status adopts the on-line monitoring mode usually at present, the on-line monitoring mode can obtain to reflect apparatus insulated unusual characteristic parameter at any time, be convenient to realize automatic management, but invest relatively large, installation is cumbersome, and need periodic maintenance, improved equipment operating cost, bring inconvenience to the workman.
The utility model content
The purpose of this utility model provides a kind of capacitive apparatus and lightning arrester dielectric loss live line measurement device, can substitute the larger on-line monitoring mode of original investment, reach operating electrical equipment is regularly detected, in time find insulation defect, prolong the effect in power failure prerun cycle.
For achieving the above object; the utility model provides a kind of capacitive apparatus and lightning arrester dielectric loss live line measurement device; comprise sampling unit and Test Host; described sampling unit be connected Test Host and connect by p-wire; be provided with signal input module in the described sampling unit; be provided with protection module, central processing module and power module in the described Test Host, described central processing module comprises that signal condition submodule and central authorities process submodule.
Preferably, described central processing module also is connected to LCD MODULE and digital interface module.
Preferably, be provided with active zero magnetic flux current sensor of punching structure in the described sampling unit.
Preferably, the shell of described sampling unit is die casting aluminum hull hermetically-sealed construction.
Preferably, described central processing submodule is TMS320F2812 single-chip microcomputer U11.
Therefore, the utility model adopts capacitive apparatus and the lightning arrester dielectric loss live line measurement device of said structure, can substitute the larger on-line monitoring mode of original investment, reaches operating electrical equipment is regularly detected, in time find insulation defect, the effect that prolongs the power failure prerun cycle.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is the structural representation of the utility model capacitive apparatus and lightning arrester dielectric loss live line measurement device embodiment;
Fig. 2 is the electrical block diagram that central authorities process submodule among the utility model capacitive apparatus and the lightning arrester dielectric loss live line measurement device embodiment;
Fig. 3 is the electrical block diagram of signal condition submodule among the utility model capacitive apparatus and the lightning arrester dielectric loss live line measurement device embodiment;
Fig. 4 is the electrical block diagram of power module among the utility model capacitive apparatus and the lightning arrester dielectric loss live line measurement device embodiment;
Fig. 5 is the electrical block diagram of protection module among the utility model capacitive apparatus and the lightning arrester dielectric loss live line measurement device embodiment;
Fig. 6 is the electrical block diagram of signal input module among the utility model capacitive apparatus and the lightning arrester dielectric loss live line measurement device embodiment.
Embodiment
Embodiment
Fig. 1 is the structural representation of the utility model capacitive apparatus and lightning arrester dielectric loss live line measurement device embodiment; as shown in Figure 1; comprise sampling unit 1 and Test Host 2; sampling unit 1 is connected with Test Host and is connected by p-wire; be provided with signal input module in the sampling unit 1; be provided with protection module 21, central processing module 22 and power module 23 in the Test Host 2; central processing module 22 comprises that signal condition submodule 24 and central authorities process submodule 25; the signal condition module is used for that input signal is carried out amplification filtering to be processed, and improves measuring accuracy.Fig. 2-Fig. 6 is followed successively by the electrical block diagram of central authorities' processing submodule, signal condition submodule, power module, protection module and signal input module in the present embodiment; as shown in Figure 3; it is TMS320F2812 single-chip microcomputer U11 that central authorities process submodule 25; TMS320F2812 single-chip microcomputer U11 adopt extend out 16, at a high speed, Multi-path synchronous Middle Sampling Analog Digital converter (A/D); realization possesses the ability of a plurality of equipment of monitoring simultaneously to real-time measurement and the high precision computation of monitoring variable.
Be provided with active zero magnetic flux current sensor of punching structure in the sampling unit 1.Present embodiment need to be measured phase place and the amplitude of leakage current, and current sensor can be introduced noise when the faint leakage current of induction, so must consider coupling and the scale-up problem of sensor output signal.Online detection is very high to the requirement of dielectric loss measurement precision, and system is operated in again under the strong electromagnetic interference environment, and this has just strengthened the difficulty that system processes feeble signal when signal condition.Current sensor is the critical component of present embodiment, directly affects the measuring accuracy of capacitance type equipment dielectric loss consumption parameter.For guaranteeing the security of sample of signal, usually should adopt the zero magnetic flux current sensor of punching structure.The principle of work of zero magnetic flux current sensor can be represented by the formula: I
1W
1+ I
2W
2=I
0W
1, excitatory magnetic potential I wherein
0W
1Existence be the main cause that causes sensor error.The classic method that reduces the excitatory magnetic potential of iron core is to adopt the high conducting magnet core that the cross section is large, magnetic circuit is short, and suitably increases the number of turn of secondary coil.Because capacitance type equipment end shield electric current is generally a milliampere level signal, the excitatory impedance of sensor is very little, and must adopt the punching sampling mode again, so traditional passive sensor can't guarantee degree of accuracy and the stability of phase tranformation error usually, be difficult to satisfy the measurement requirement of dielectric loss parameter.Adopting active zero flux designs technology is to improve the unique channel of small electric current sensor accuracy of detection.Monitoring system has adopted advanced automatic compensation type current sensor, do the iron core except selecting the specific alloy that initial permeability is higher, loss is less, also adopted unique deep negative feedback compensation technique, can the excitatory magnetic potential of iron core automatically be compensated, keep iron core to be operated in and accept desirable zero magnetic flux state.Long-term use experience shows, the current sensor of this punching structure (the punching aperture is Φ 30mm) can accurately detect the power current signal in 100 μ A～1000mA scope, the phase tranformation error is not more than ± and 0.02 °, and have fabulous temperature characterisitic and anti-electromagnetic interference capability, thoroughly solved the technical barrier that capacitance type equipment end shield current signal is accurately taken a sample.If need detectable voltage signals, as long as in advance voltage signal is converted into current signal by noninductive resistance.The shell of sampling unit 1 is die casting aluminum hull hermetically-sealed construction in addition, Waterproof cable joint is adopted in secondary output, after installation of sensors is complete, not charged under normal circumstances, if test, only connect upper sampling unit secondary cable and get final product, can accomplish that " plug and play " need not to carry out any operation to the end shield signal lead.
In addition, present embodiment central processing module 22 also is connected to LCD MODULE 26 and digital interface module 27, is user-friendly to.
Therefore, the utility model adopts capacitive apparatus and the lightning arrester dielectric loss live line measurement device of said structure, can substitute the larger on-line monitoring mode of original investment, reaches operating electrical equipment is regularly detected, in time find insulation defect, the effect that prolongs the power failure prerun cycle.
It should be noted that at last: above embodiment is only in order to the technical solution of the utility model to be described but not limit it, although with reference to preferred embodiment the utility model is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment or be equal to replacement the technical solution of the utility model, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solutions of the utility model.
Claims (5)
1. a capacitive apparatus and lightning arrester dielectric loss live line measurement device; it is characterized in that: comprise sampling unit and Test Host; described sampling unit be connected Test Host and connect by p-wire; be provided with signal input module in the described sampling unit; be provided with protection module, central processing module and power module in the described Test Host, described central processing module comprises that signal condition submodule and central authorities process submodule.
2. capacitive apparatus according to claim 1 and lightning arrester dielectric loss live line measurement device, it is characterized in that: described central processing module also is connected to LCD MODULE and digital interface module.
3. capacitive apparatus according to claim 2 and lightning arrester dielectric loss live line measurement device is characterized in that: active zero magnetic flux current sensor that is provided with the punching structure in the described sampling unit.
4. capacitive apparatus according to claim 3 and lightning arrester dielectric loss live line measurement device, it is characterized in that: the shell of described sampling unit is die casting aluminum hull hermetically-sealed construction.
5. capacitive apparatus according to claim 4 and lightning arrester dielectric loss live line measurement device is characterized in that: it is TMS320F2812 single-chip microcomputer U11 that described central authorities process submodule.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220251434 CN202837407U (en) | 2012-05-31 | 2012-05-31 | Capacitive equipment and lightning arrester medium loss live line measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220251434 CN202837407U (en) | 2012-05-31 | 2012-05-31 | Capacitive equipment and lightning arrester medium loss live line measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN202837407U true CN202837407U (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220251434 Expired - Fee Related CN202837407U (en) | 2012-05-31 | 2012-05-31 | Capacitive equipment and lightning arrester medium loss live line measuring device |
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| CN (1) | CN202837407U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062508A (en) * | 2014-06-20 | 2014-09-24 | 国家电网公司 | Live detection auxiliary device for dielectric loss of voltage transformer |
-
2012
- 2012-05-31 CN CN 201220251434 patent/CN202837407U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062508A (en) * | 2014-06-20 | 2014-09-24 | 国家电网公司 | Live detection auxiliary device for dielectric loss of voltage transformer |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20140531 |