CN203732606U - Insulation parameter measuring device for power grid with neutral point grounded via resistance - Google Patents
Insulation parameter measuring device for power grid with neutral point grounded via resistance Download PDFInfo
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- CN203732606U CN203732606U CN201420019798.XU CN201420019798U CN203732606U CN 203732606 U CN203732606 U CN 203732606U CN 201420019798 U CN201420019798 U CN 201420019798U CN 203732606 U CN203732606 U CN 203732606U
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Abstract
本实用新型公开了一种中性点经电阻接地电网绝缘参数测量装置，涉及电网电容电流和线路绝缘电阻测量的技术。接地变压器模块连接电网母线，接地变压器模块出线端送出零序电压信号至控制测量模块；中性点接地电阻器模块一端与接地变压器中性点连接，另一端可靠接地；控制测量模块发出控制信号至断路器控制模块，断路器驱动模块控制断路器模块2的开断；控制器模块将计算结果输入显示模块，显示测量结果。所述中性点接地电阻器模块采取两块电阻器串联的形式，断路器模块两端连接中性点接地电阻器模块的任一个电阻器，即断路器模块闭合即可短路两个串联电阻器的其中一个。
The utility model discloses a neutral point via resistance grounding grid insulation parameter measuring device, which relates to the technology of grid capacitance current and line insulation resistance measurement. The grounding transformer module is connected to the grid bus, and the outlet end of the grounding transformer module sends a zero-sequence voltage signal to the control and measurement module; one end of the neutral point grounding resistor module is connected to the neutral point of the grounding transformer, and the other end is reliably grounded; the control and measurement module sends a control signal to the The circuit breaker control module and the circuit breaker driving module control the breaking of the circuit breaker module 2; the controller module inputs the calculation result into the display module to display the measurement result. The neutral point grounding resistor module adopts the form of two resistors in series, and the two ends of the circuit breaker module are connected to any resistor of the neutral point grounding resistor module, that is, the two series resistors can be short-circuited when the circuit breaker module is closed one of the
Description
Technical field
The utility model relates to the technology of electric network capacitance and current and line insulation resistance measurement, specifically a kind of device for the parameter measurement of Neutral Grounding through Resistance in Electrical line insulation.
Background technology
Along with the expansion of net capacity and being widely used of cable, single-phase earth fault current is along with increase, and this will have a strong impact on the safety of mains supply.The insulation parameter of accurately measuring electrical network is significant to the selection of electrical network earthing mode and the method for operation.
The Biased capacitor method of measuring at present electric network capacitance and current is mainly applicable to isolated neutral system; Correlation technique based on arc suppression coil resonance principle is applicable to resonant earthed system.Existing method is poor through the applicability of the electrical network of resistance (high resistant) ground connection for neutral point, the impact mainly due to neutral point grounding resistor on measurement result; Measurement mechanism is also for making full use of the effect of neutral point grounding resistor.And technician manually calculates capacitance current according to the electric signal of measuring, and measuring equipment does not possess visualized operation interface.
Through the retrieval in prior art field is found, Chinese Patent Application No. is 2013200910205, Granted publication number is CN203241463U, patent name is: the neutral point of electric network CSET complete equipment of measuring capacitance current, this patent is the device that neutral point external capacitor method is measured electric network capacitance and current, is not suitable for the electrical network of Neutral Grounding through Resistance in Electrical.
Summary of the invention
Technical matters: technical problem to be solved in the utility model is to provide a kind of device for the parameter measurement of Neutral Grounding through Resistance in Electrical line insulation, the technical matters of measuring to solve Neutral Grounding through Resistance in Electrical line insulation parameter on-line tracing.
Technical scheme: it is as follows that the utility model solves the technical scheme that its technical matters adopts:
A kind of Neutral Grounding through Resistance in Electrical line insulation parameter measuring apparatus comprises grounding transformer module 1, breaker module 2, neutral point grounding resistor module 3, control survey module 4, isolating switch driver module 5, display module 6;
Annexation: grounding transformer module 1 connects electrical network bus, grounding transformer module 1 leading-out terminal is sent residual voltage signal to control survey module 4; Stand and use 220V power supply to be connected with control survey module 4, working power is provided; Neutral point grounding resistor module 3 one end are connected with grounding transformer neutral point, other end reliable ground; Control survey module 4 is sent and is controlled signal to isolating switch driver module 5, and isolating switch driver module 5 is controlled cut-offfing of breaker module 2; Result of calculation is inputted display module 6 by control survey module 4, display measurement result.
Described neutral point grounding resistor module 3 is taked the form of two resistor in series, and breaker module 2 two ends connect any resistor of neutral point grounding resistor module 3, and breaker module 2 closures can be by this resistor short circuit.
Beneficial effect: a kind of Neutral Grounding through Resistance in Electrical line insulation parameter measuring apparatus the utility model proposes, this device is by the switching operation of isolating switch, thus the size of change neutral point grounding resistor.Because neutral point grounding resistor is taked the form of two resistor in series, breaker operator once can be realized line insulation parameter measurement.This device, without by other external devices, rationally utilizes the grounding resistor of Neutral Grounding through Resistance in Electrical electrical network to realize insulation parameter measurement, and cost is low, and can realize the accurate measurement of electric network capacitance and current and line insulation resistance.The real-time display measurement result of display module, increases man-machine interface, and computation and measurement result is more convenient.
Brief description of the drawings:
Fig. 1 structured flowchart of the present utility model;
Fig. 2 workflow diagram of the present utility model;
In Fig. 1:
1-grounding transformer module;
2-breaker module;
3-neutral point grounding resistor module;
4-control survey module;
5-isolating switch driver module;
6-display module.
Embodiment
The functional block that embodiment of the present utility model comprises and parameter model thereof are selected as follows:
1. grounding transformer module: adopt independently Z-type grounding transformer, the stable and reliable operation of the type grounding transformer;
2. breaker module: select the EV12 type vacuum circuit breaker that arc extinguishing ability is good, reaction velocity is fast;
3. neutral point grounding resistor module: adopt two ZGNGR type distribution system neutral point grounding resistor series connection;
4. control survey module: consider to control the factor of requirement and cost, select STC89C52 single-chip microcomputer;
5. isolating switch driver module: controller module drives the operating mechanism in breaker module, realizes the control of isolating switch;
6. display module: adopt LCD1602 display measurement result.
Annexation:
Grounding transformer module 1 connects electrical network bus, and grounding transformer module 1 leading-out terminal is sent residual voltage signal to control survey module 4; Stand and use 220V power supply to be connected with control survey module 4, working power is provided; Neutral point grounding resistor module 3 one end are connected with grounding transformer neutral point, other end reliable ground; Control survey module 4 is sent and is controlled signal to isolating switch driver module 5, and isolating switch driver module 5 is controlled cut-offfing of breaker module 2; Result of calculation is inputted display module 6 by control survey module 4, display measurement result.
Described neutral point grounding resistor module 3 is taked the form of two resistor in series, and breaker module 2 two ends connect any resistor of neutral point grounding resistor module 3, and breaker module 2 closures can be by this resistor short circuit.
Implementation step:
A. device brings into operation, and control survey module 4 powers on, and connects grounding transformer module 1, measures residual voltage signal, preserves measurement data;
Then control survey module of b. 4 is controlled isolating switch driver module 5 output signal close circuit breaker modules 2, and control survey module 4 is measured residual voltage signal again, preserves measurement data;
C. calculates line insulation parameter by above save data control survey module 4, and result of calculation is transported to display module 6 display measurement results;
Then control survey module of d. 4 is controlled isolating switch driver module again: 5 output signal cut-off breaker modules 2, make system recover normal;
If e. need remeasure, start to re-execute from step a.
Claims (2)
1. a Neutral Grounding through Resistance in Electrical line insulation parameter measuring apparatus, it is characterized in that, comprise grounding transformer module (1), breaker module (2), neutral point grounding resistor module (3), control survey module (4), isolating switch driver module (5), display module (6);
Annexation: grounding transformer module (1) connects electrical network bus, and grounding transformer module (1) leading-out terminal is sent residual voltage signal to control survey module (4); Stand and use 220V power supply to be connected with control survey module (4), working power is provided; Neutral point grounding resistor module (3) one end is connected with grounding transformer neutral point, other end reliable ground; Control survey module (4) is sent and is controlled signal to isolating switch driver module (5), and isolating switch driver module (5) is controlled cut-offfing of breaker module (2); Result of calculation is inputted display module (6), display measurement result by control survey module (4).
2. a kind of Neutral Grounding through Resistance in Electrical line insulation parameter measuring apparatus claimed in claim 1, it is characterized in that, described neutral point grounding resistor module (3) is taked the form of two resistor in series, breaker module (2) two ends connect a resistor of neutral point grounding resistor module (3), and breaker module (2) closure can be by this resistor short circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420019798.XU CN203732606U (en) | 2014-01-09 | 2014-01-09 | Insulation parameter measuring device for power grid with neutral point grounded via resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420019798.XU CN203732606U (en) | 2014-01-09 | 2014-01-09 | Insulation parameter measuring device for power grid with neutral point grounded via resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203732606U true CN203732606U (en) | 2014-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420019798.XU Expired - Fee Related CN203732606U (en) | 2014-01-09 | 2014-01-09 | Insulation parameter measuring device for power grid with neutral point grounded via resistance |
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| CN (1) | CN203732606U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445511A (en) * | 2015-12-11 | 2016-03-30 | 国家电网公司 | Singlephase earth fault signal generating device and method for simulation isolated neutral system |
| CN105938168A (en) * | 2016-06-23 | 2016-09-14 | 中车南京浦镇车辆有限公司 | AC power supply system insulation fault detection circuit |
| CN106324314A (en) * | 2016-10-25 | 2017-01-11 | 云南电网有限责任公司电力科学研究院 | Capacitive current testing device and method for isolated neutral system |
-
2014
- 2014-01-09 CN CN201420019798.XU patent/CN203732606U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445511A (en) * | 2015-12-11 | 2016-03-30 | 国家电网公司 | Singlephase earth fault signal generating device and method for simulation isolated neutral system |
| CN105445511B (en) * | 2015-12-11 | 2019-04-16 | 国家电网公司 | Simulate isolated neutral system singlephase earth fault signal generation apparatus and method |
| CN105938168A (en) * | 2016-06-23 | 2016-09-14 | 中车南京浦镇车辆有限公司 | AC power supply system insulation fault detection circuit |
| CN106324314A (en) * | 2016-10-25 | 2017-01-11 | 云南电网有限责任公司电力科学研究院 | Capacitive current testing device and method for isolated neutral system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140723 Termination date: 20160109 |