CN203849329U - Power distribution network grounding parameter online measuring device based on constant zero sequence voltage amplitude - Google Patents
Power distribution network grounding parameter online measuring device based on constant zero sequence voltage amplitude Download PDFInfo
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- CN203849329U CN203849329U CN201420187240.2U CN201420187240U CN203849329U CN 203849329 U CN203849329 U CN 203849329U CN 201420187240 U CN201420187240 U CN 201420187240U CN 203849329 U CN203849329 U CN 203849329U
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Abstract
The utility model discloses a power distribution network grounding parameter online measuring device based on constant zero sequence voltage amplitude; the power distribution network grounding parameter online measuring device comprises a grounding transformer module, a zero sequence voltage measuring module, a central processor module, a damping resistor module, an adjustable arc extinguishing coil module and a breaker module; a grounding transformer module primary side is connected with a bus of the power distribution network, a secondary side of the transformer module is connected with one end of the zero sequence voltage module, and the other end of the zero sequence voltage module is connected with an output end of the central processor module; the output end of the central processor module is connected with a tap joint of the breaker module, a display and the adjustable arc extinguishing coil module; the adjustable arc extinguishing coil module and the breaker module are respectively connected with the network bus; the damping resistor module is connected with the breaker module; the online measuring device is simple in operation, high in safety, need no additional impedance device, needs no injection equipment, is low in measuring cost, cannot cause neutral point overvoltage, is convenient in measurement, and belongs to the online tracking measuring device.
Description
technical field:
The present invention relates to a kind of power distribution network Parameter Measuring device over the ground, particularly relate to a kind of power distribution network based on constant residual voltage amplitude Parameter Measuring device over the ground.
background technology:
Power distribution network over the ground parameter comprises line mutual-ground capacitor and insulation resistance, by measuring power distribution network parameter over the ground, and then definite arc suppression coil compensates the inductance value under the method for operation entirely, reach the object of compensation network capacitance current to greatest extent, capacitance current is excessive during mostly by single-phase earthing causes for the fault occurring in electrical network at present, along with the increase of power distribution network capacity, the growth of circuit, especially the use of cable, while making fault ground, capacitance current increases, the measuring accuracy of capacitance current determines the precision maneuver of arc suppression coil regulation and control and route selection and protective device, especially the colliery low voltage electric network below 10kV, mostly adopt cable power supply, capacitance current value is larger, within must being limited in 20A according to the capacitance current of " safety regulations in coal mine " regulation Coal Mine Power Network, so require higher to the degree of accuracy of capacitance current measurement.
Current capacitance current measurement technology mainly contains the methods such as artificial neutral point's method, Biased capacitor method, injecting signal, in artificial neutral point's method, as long as small change occurs artificial capacitance group, will produce larger measuring error; Biased capacitor method adds larger electric capacity can cause not offset phase voltage to raise, and easily makes line insulation weakness be short-circuited; Injection Signal is the measurement electrical network electric capacity new method proposing recent years, but the frequency amplitude of Injection Signal is chosen the improper measurement result that all can have a strong impact on.
Through the retrieval in prior art field is found, Chinese Patent Application No. is CN200910044606.4, publication number is CN101696983A, patent name is: neutral point measuring method and the device of capacitance current of distribution network, this patent is to measure the device of electric network capacitance and current based on neutral-point solid ground, is not suitable for the on-line measurement of low and medium voltage distribution network.
summary of the invention:
Technical matters to be solved by this invention is: overcome the deficiencies in the prior art, a kind of Parameter Measuring device over the ground of the power distribution network based on constant residual voltage amplitude that can solve the online Real-time Measuring Technique problem of neutral non-effective grounding electric network capacitance and current is provided.
Technical scheme of the present invention is: a kind of power distribution network based on constant residual voltage amplitude Parameter Measuring device over the ground, comprise grounding transformer module, residual voltage measurement module, CPU module, damping resistance module, adjustable arc suppression coil module, breaker module, it is characterized in that: described grounding transformer module primary side is connected with the bus of power distribution network, secondary side is connected with one end of residual voltage module, the other end of residual voltage module is connected with CPU module output terminal, described CPU module output terminal and breaker module, display, the tap of adjustable arc suppression coil module connects, described adjustable arc suppression coil module is connected with electrical network bus respectively with described breaker module, described damping resistance module is connected with breaker module.
Described adjustable arc suppression coil module is provided with at least one tap, and is subject to CPU module control.Between described central processing unit and breaker module, be provided with isolating switch driver module.
The invention has the beneficial effects as follows:
1, a kind of power distribution network based on the constant residual voltage amplitude Parameter Measuring device over the ground the utility model proposes, simply regulate for the first time arc suppression coil inductance value and switching damping resistance value, measure the amplitude of neutral point voltage by zero sequential potential transformer, taking this residual voltage amplitude as reference value, follow the tracks of and regulate arc suppression coil and damping resistance, reach the equal object of third harmonic tuning neutral point voltage amplitude, thereby can realize the Measurement accuracy of parameter over the ground.
2, this device is simple to operate, safe, does not need to access additional impedance device, also does not need to increase injection device, measures cost low, can not cause neutral point overvoltage, and measures conveniently, belongs to on-line tracing measurement mechanism.
3, a kind of power distribution network based on constant residual voltage amplitude Parameter Measuring device over the ground that the utility model provides, accurately measuring power distribution network over the ground on the basis of parameter, inductance value when arc suppression coil compensates operation entirely can be determined, thereby the ability of building-out capacitor electric current and extinguish arcs can be strengthened.
brief description of the drawings:
Fig. 1 is the power distribution network structured flowchart of Parameter Measuring device over the ground based on constant residual voltage amplitude.
Fig. 2 is the power distribution network measuring method process flow diagram of Parameter Measuring device over the ground based on constant residual voltage amplitude.
embodiment:
Embodiment: referring to Fig. 1, in figure, 1-grounding transformer, 2-residual voltage measurement module, 3-CPU module, arc suppression coil module that 4-is adjustable, 5-damping resistance module, 6-breaker module, 7-isolating switch driver module, 8-display.
Power distribution network based on constant residual voltage amplitude is Parameter Measuring device over the ground: comprise grounding transformer module 1, residual voltage measurement module 2, CPU module 3, adjustable arc suppression coil module 4, damping resistance module 5, breaker module 6 and display 8, A, B, the C three-phase of new star connection access electrical network for the primary side of grounding transformer 1, the open delta place of secondary side is connected with residual voltage measurement module 2, CPU module 3 adopts Siemens S7-300 PLC, the input end of CPU module 3 is connected with the secondary singal of residual voltage measurement module 2, CPU module 3 is with amplitude comparator circuit, zero sequence voltage on neutral point effective value during for comparison system access different damping resistance, the output node of CPU module 3 sends control signal on the one hand to isolating switch driver module 7, for cut-offfing the isolating switch being connected with damping resistance module, be connected with the tap of adjustable arc suppression coil module on the other hand, for regulating the inductance value of arc suppression coil access electrical network, adjustable arc suppression coil module 4, with tap, is accepted the adjusting of CPU module 3 control signals, for changing zero sequence voltage on neutral point effective value, damping resistance module 5 comprises two stake resistances, accesses power distribution network by isolating switch, neutral point overvoltage when stake resistance is used for preventing from regulating arc suppression coil, breaker module 6 adopts the ZW8A-12 series high voltage isolating switch that arc extinguishing ability is stronger, nominal insulation voltage 12KV, operation breaking capacity 25KA, isolating switch driver module 7, as the operating mechanism of isolating switch, is divided into manual gear and automatic catch, control isolating switch deciliter, display 8 is connected with central processing unit 3, shows in real time the residual voltage amplitude of power distribution network and parameter value over the ground.
When use, start CPU module 3, drop into grounding transformer module 1, residual voltage measurement module 2 is measured the zero sequence voltage on neutral point under electrical network normal operating conditions in real time, and input signal using this residual voltage effective value as CPU module 3; CPU module 3 is using the effective value of this residual voltage as reference value, and sends control signal to isolating switch driver module 7, accesses damping resistance R by breaker module 6
1, become the inductance value of adjustable arc suppression coil module 4, in the time that zero sequence voltage on neutral point is restored to reference value, stop regulating adjustable arc suppression coil module 4, and show in real time residual voltage effective value by display 8, inductance value, the damping resistance of access electrical network; CPU module 3 is sent control signal to isolating switch driver module 7, disconnects damping resistance R by breaker module 6
1, and access damping resistance R
2; Simultaneously the output node of CPU module 3 changes adjustable arc suppression coil module 4 and accesses the tap of electrical network, in the time that zero sequence voltage on neutral point is restored to reference value, stop regulating adjustable arc suppression coil module 4, and show in real time residual voltage effective value by display, inductance value, the damping resistance of access electrical network; The display 8 demonstration current line distribution capacitance of power distribution network and over the ground parameter in real time, operator can be as required, can repeat above-mentioned steps and measure.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all still belong in the scope of technical solution of the present invention.
Claims (3)
1. the power distribution network based on constant residual voltage amplitude Parameter Measuring device over the ground, comprise grounding transformer module, residual voltage measurement module, CPU module, damping resistance module, adjustable arc suppression coil module, breaker module, it is characterized in that: described grounding transformer module primary side is connected with the bus of power distribution network, secondary side is connected with one end of residual voltage module, the other end of residual voltage module is connected with CPU module output terminal, described CPU module output terminal and breaker module, display, the tap of adjustable arc suppression coil module connects, described adjustable arc suppression coil module is connected with electrical network bus respectively with described breaker module, described damping resistance module is connected with breaker module.
2. the power distribution network based on constant residual voltage amplitude according to claim 1 Parameter Measuring device over the ground, is characterized in that: described adjustable arc suppression coil module is provided with at least one tap, and is subject to CPU module control.
3. the power distribution network based on constant residual voltage amplitude according to claim 1 Parameter Measuring device over the ground, is characterized in that: between described central processing unit and breaker module, be provided with isolating switch driver module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420187240.2U CN203849329U (en) | 2014-04-17 | 2014-04-17 | Power distribution network grounding parameter online measuring device based on constant zero sequence voltage amplitude |
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| CN201420187240.2U CN203849329U (en) | 2014-04-17 | 2014-04-17 | Power distribution network grounding parameter online measuring device based on constant zero sequence voltage amplitude |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267298A (en) * | 2014-10-23 | 2015-01-07 | 上海银都节能服务有限公司 | Method for calculating parameters of duplex winding power transformer |
| CN107894543A (en) * | 2017-11-14 | 2018-04-10 | 云南电网有限责任公司电力科学研究院 | A kind of power distribution network parameter measuring apparatus, method and system over the ground |
| CN115792400A (en) * | 2023-02-02 | 2023-03-14 | 国网湖北省电力有限公司武汉供电公司 | Method, system and medium for accurately measuring parameters of ungrounded neutral point power distribution network |
-
2014
- 2014-04-17 CN CN201420187240.2U patent/CN203849329U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267298A (en) * | 2014-10-23 | 2015-01-07 | 上海银都节能服务有限公司 | Method for calculating parameters of duplex winding power transformer |
| CN104267298B (en) * | 2014-10-23 | 2017-11-24 | 上海华群实业股份有限公司 | A kind of calculation method of parameters of double winding power transformer |
| CN107894543A (en) * | 2017-11-14 | 2018-04-10 | 云南电网有限责任公司电力科学研究院 | A kind of power distribution network parameter measuring apparatus, method and system over the ground |
| CN115792400A (en) * | 2023-02-02 | 2023-03-14 | 国网湖北省电力有限公司武汉供电公司 | Method, system and medium for accurately measuring parameters of ungrounded neutral point power distribution network |
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