CN112578186A - Direct-current insulation detection system and device and balance bridge measurement method - Google Patents
Direct-current insulation detection system and device and balance bridge measurement method Download PDFInfo
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- CN112578186A CN112578186A CN202011518053.4A CN202011518053A CN112578186A CN 112578186 A CN112578186 A CN 112578186A CN 202011518053 A CN202011518053 A CN 202011518053A CN 112578186 A CN112578186 A CN 112578186A
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- 238000001514 detection method Methods 0.000 title claims abstract description 72
- 238000009413 insulation Methods 0.000 title claims abstract description 41
- 238000000691 measurement method Methods 0.000 title claims abstract description 8
- 238000005070 sampling Methods 0.000 claims abstract description 52
- 230000003068 static effect Effects 0.000 claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 20
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- 238000012544 monitoring process Methods 0.000 abstract description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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Abstract
The invention discloses a direct current insulation detection system, a direct current insulation detection device and a balance bridge measurement method, belongs to the technical field of circuit monitoring, and particularly relates to a direct current insulation detection system which comprises a balance bridge measurement circuit, a balance bridge resistor and a system power supply input/exit switch; a change-over switch is arranged between the balance bridge resistor and the bridge arm resistor, two static contacts of the change-over switch are respectively and electrically connected with two end points of a bridge circuit of the balance bridge resistor, and a movable contact of the change-over switch is electrically connected with the bridge arm resistor; the system direct current power supply ground resistor comprises a system direct current power supply positive bus ground resistor and a system direct current power supply negative bus ground resistor which are respectively provided with a system power supply positive ground sampling detection terminal and a system power supply negative ground sampling detection terminal, wherein a bridge arm voltage sampling detection terminal is arranged on a bridge arm resistor, and a neutral-position-time bridge arm voltage difference sampling detection terminal is arranged on two static contacts. The grounding alarm device can monitor the grounding condition in time, generate a grounding alarm signal and push the grounding alarm signal to workers, so that the workers can respond quickly.
Description
Technical Field
The invention belongs to the technical field of current monitoring, and particularly relates to a direct-current insulation detection system and device and a balance bridge measurement method.
Background
In recent years, with the rapid development of a new energy distributed power generation technology, a novel energy storage technology, a direct current charging technology and a direct current frequency conversion energy-saving technology, a direct current distribution network provides a direct current bus for a load, the direct current load can be directly supplied with power by the direct current bus, the alternating current load needs to be supplied with power after passing through an inverter device, and if the proportion of the direct current load in the load is large, the direct current distribution network has great advantages. The direct-current distribution network has small line loss, high reliability, no need of phase-frequency control and strong distributed power supply accepting capability. The direct-current distribution system saves a large number of scattered rectifiers (AC/DC) and grid-connected inverters (DC/AC), simplifies the distribution network structure, improves the system efficiency and reliability, reduces the cost and makes the direct-current distribution network favored by the industry.
The inventor of the invention finds that, in the prior art, the positive electrode and the negative electrode of the direct current system are not grounded, when one point is grounded, the grounding point does not have short-circuit current flowing, the fuse can not be fused and can still continue to operate, but the short-circuit current can be found and eliminated in time, otherwise, when the other point is grounded, incorrect actions of a signal loop, a control loop, relay protection and the like can be caused, and thus, heavy loss is caused.
Disclosure of Invention
In order to solve at least the technical problems, the invention provides a direct current insulation detection system, a direct current insulation detection device and a balance bridge measurement method.
According to a first aspect of the present invention, there is provided a dc isolation detection system comprising, a balance bridge measurement circuit comprising,
balancing bridge resistance and a system power on/off switch;
a change-over switch is arranged between the balanced bridge resistor and the bridge arm resistor, two static contacts of the change-over switch are respectively and electrically connected with two ends of a bridge circuit of the balanced bridge resistor, and a movable contact of the change-over switch is electrically connected with the bridge arm resistor;
the system direct-current power supply ground resistance comprises a system direct-current power supply positive bus ground resistance and a system direct-current power supply negative bus ground resistance, wherein the system direct-current power supply positive bus ground resistance and the system direct-current power supply negative bus ground resistance are respectively provided with a system power supply positive ground sampling detection terminal and a system power supply negative ground sampling detection terminal, the bridge arm resistance is provided with a bridge arm voltage sampling detection terminal, and the two static contacts are provided with bridge arm voltage difference sampling detection terminals in neutral positions.
Further, the air conditioner is provided with a fan,
the system also comprises a bridge arm voltage sampling detection point arranged on the bridge arm resistor, and a bridge arm voltage difference sampling detection point in a neutral position is arranged on the two static contacts.
Further, the air conditioner is provided with a fan,
the system is used for balance bridge measurement and comprises a direct-current power supply positive pole and negative pole insulation resistance measurement solving value.
Further, the air conditioner is provided with a fan,
and generating a grounding alarm signal under the condition that the solved values of the positive and negative pole grounding insulation resistances of the direct-current power supply reach a preset alarm threshold value.
Further, the air conditioner is provided with a fan,
the system also comprises a power bridge which is damaged when the positive pole and the negative pole of the system are grounded, current flows through the power bridge, and a grounding alarm signal is sent out.
Further, the air conditioner is provided with a fan,
the system also comprises a direct current intelligent mutual inductor which is configured on each direct current branch and used for measuring leakage current, and under the condition that the detected current flowing into the direct current mutual inductor is different in size, the positive and negative pole earth insulation resistance values of the direct current power supply are obtained through calculation under the condition that the leakage current is not 0.
Further, the air conditioner is provided with a fan,
the system also comprises a step of pushing the grounding alarm signal to a worker under the condition of sending the grounding alarm signal so that the worker can receive the alarm information in time to carry out alarm receiving processing.
According to a second aspect of the present invention, there is provided a dc insulation detecting apparatus comprising: the main chip and a balance bridge measuring circuit connected with the main chip;
the balance bridge measuring circuit comprises a balance bridge resistor and a system power supply input/output switch;
a change-over switch is arranged between the balanced bridge resistor and the bridge arm resistor, two static contacts of the change-over switch are respectively and electrically connected with two ends of a bridge circuit of the balanced bridge resistor, and a movable contact of the change-over switch is electrically connected with the bridge arm resistor;
the system direct-current power supply ground resistance comprises a system direct-current power supply positive bus ground resistance and a system direct-current power supply negative bus ground resistance, wherein the system direct-current power supply positive bus ground resistance and the system direct-current power supply negative bus ground resistance are respectively provided with a system power supply positive ground sampling detection terminal and a system power supply negative ground sampling detection terminal, the bridge arm resistance is provided with a bridge arm voltage sampling detection terminal, and the two static contacts are provided with bridge arm voltage difference sampling detection terminals in neutral positions.
According to a third aspect of the present invention, there is provided a balance bridge measurement method of a dc insulation detection system, comprising,
generating solving values of the positive and negative pole ground insulation resistance of the direct-current power supply by adopting a balance bridge measuring circuit; wherein the content of the first and second substances,
a balanced bridge measurement circuit includes, in combination,
balancing bridge resistance and a system power on/off switch;
a change-over switch is arranged between the balanced bridge resistor and the bridge arm resistor, two static contacts of the change-over switch are respectively and electrically connected with two ends of a bridge circuit of the balanced bridge resistor, and a movable contact of the change-over switch is electrically connected with the bridge arm resistor;
the system direct-current power supply ground resistance comprises a system direct-current power supply positive bus ground resistance and a system direct-current power supply negative bus ground resistance, wherein the system direct-current power supply positive bus ground resistance and the system direct-current power supply negative bus ground resistance are respectively provided with a system power supply positive ground sampling detection terminal and a system power supply negative ground sampling detection terminal, the bridge arm resistance is provided with a bridge arm voltage sampling detection terminal, and the two static contacts are provided with bridge arm voltage difference sampling detection terminals in neutral positions.
The invention has the beneficial effects that: through the configuration of the balance bridge measuring circuit, the solving values of the insulation resistance of the positive pole and the negative pole of the direct-current power supply to the ground are effectively monitored and calculated, the grounding condition is monitored in time, a grounding alarm signal can be generated, and the grounding alarm signal is pushed to workers, so that the workers can quickly respond.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which,
fig. 1 is a schematic structural diagram of a dc insulation detection system according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
In a first aspect of the invention, a DC insulation detection system is provided, comprising, a balance bridge measurement circuit,
balancing bridge resistance and a system power on/off switch;
a change-over switch is arranged between the balanced bridge resistor and the bridge arm resistor, two static contacts of the change-over switch are respectively and electrically connected with two ends of a bridge circuit of the balanced bridge resistor, and a movable contact of the change-over switch is electrically connected with the bridge arm resistor;
the system direct-current power supply ground resistance comprises a system direct-current power supply positive bus ground resistance and a system direct-current power supply negative bus ground resistance, wherein the system direct-current power supply positive bus ground resistance and the system direct-current power supply negative bus ground resistance are respectively provided with a system power supply positive ground sampling detection terminal and a system power supply negative ground sampling detection terminal, the bridge arm resistance is provided with a bridge arm voltage sampling detection terminal, and the two static contacts are provided with bridge arm voltage difference sampling detection terminals in neutral positions.
In another embodiment of the invention, the direct current insulation detection system further comprises a bridge arm voltage sampling detection point arranged on the bridge arm resistor, and a neutral-position bridge arm voltage difference sampling detection point is arranged on the two stationary contacts.
In the invention, the direct current insulation detection system is used for measuring the balance bridge and comprises a direct current power supply positive and negative pole insulation resistance measurement solving value to ground.
Further, the system generates a grounding alarm signal under the condition that the solved values of the positive and negative pole grounding insulation resistances of the direct-current power supply reach a preset alarm threshold value.
When the positive pole and the negative pole of the system are grounded, the bridge balance is damaged, current flows through the bridge, and a grounding alarm signal is sent out.
In another embodiment of the present invention, the system further includes a dc intelligent transformer configured on each dc branch for measuring leakage current, and when the detected current flowing into the dc intelligent transformer is different in magnitude, the leakage current is not 0, and the positive and negative ground insulation resistance values of the dc power supply are calculated.
The system also comprises a step of pushing the grounding alarm signal to a worker under the condition of sending the grounding alarm signal so that the worker can receive the alarm information in time to carry out alarm receiving processing.
In yet another embodiment of the invention, a dc isolation system is provided, comprising,
powering on the system, and initializing the system;
in this embodiment, specifically, the method includes powering on the balanced bridge measurement circuit to start the balanced bridge measurement circuit to operate, where the balanced bridge measurement circuit includes:
balancing bridge resistance and a system power on/off switch;
a change-over switch is arranged between the balanced bridge resistor and the bridge arm resistor, two static contacts of the change-over switch are respectively and electrically connected with two ends of a bridge circuit of the balanced bridge resistor, and a movable contact of the change-over switch is electrically connected with the bridge arm resistor;
the direct-current power supply ground resistance comprises a direct-current power supply positive bus ground resistance and a direct-current power supply negative bus ground resistance, wherein the direct-current power supply positive bus ground resistance and the direct-current power supply negative bus ground resistance are respectively provided with a power supply positive ground sampling detection terminal and a power supply negative ground sampling detection terminal, the bridge arm resistance is provided with a bridge arm voltage sampling detection terminal, and the two static contacts are provided with bridge arm voltage difference sampling detection terminals in neutral positions.
The system utilizes a balance bridge measuring circuit to monitor the solved values of the positive and negative bus ground resistances of the direct-current power supply in real time, and can judge that the positive and negative ground resistances are grounded under the condition that the solved values of the positive and negative ground insulation resistances of the direct-current power supply reach a preset alarm threshold value, at the moment, the bridge balance is damaged, a grounding alarm signal is generated, and the grounding alarm signal is pushed to a worker. The grounding alarm signal can also be pushed to all the staff who establishes connection with the system in a broadcasting mode. The grounding alarm signal can be found and processed in time. The working efficiency is effectively improved, and the system safety is improved.
According to a second aspect of the present invention, there is provided a dc insulation detecting apparatus, as shown in fig. 1, comprising: a main chip S01 and a balanced bridge measurement circuit S02 connected thereto;
the balanced bridge measuring circuit S02 comprises a balanced bridge resistor and a system power supply input/output switch;
a change-over switch is arranged between the balanced bridge resistor and the bridge arm resistor, two static contacts of the change-over switch are respectively and electrically connected with two ends of a bridge circuit of the balanced bridge resistor, and a movable contact of the change-over switch is electrically connected with the bridge arm resistor;
the system direct-current power supply ground resistance comprises a system direct-current power supply positive bus ground resistance and a system direct-current power supply negative bus ground resistance, wherein the system direct-current power supply positive bus ground resistance and the system direct-current power supply negative bus ground resistance are respectively provided with a system power supply positive ground sampling detection terminal and a system power supply negative ground sampling detection terminal, the bridge arm resistance is provided with a bridge arm voltage sampling detection terminal, and the two static contacts are provided with bridge arm voltage difference sampling detection terminals in neutral positions.
In another embodiment of the present invention, the balance bridge measurement circuit S02 further includes a bridge arm voltage sampling detection point disposed on the bridge arm resistor, and a neutral-time bridge arm voltage difference sampling detection point is disposed on the two stationary contacts.
The direct-current insulation detection device is used for balance bridge measurement and comprises a direct-current power supply positive electrode insulation resistance measurement solving value and a direct-current power supply negative electrode insulation resistance measurement solving value.
Further, the device generates a grounding alarm signal under the condition that the solved values of the positive and negative pole grounding insulation resistances of the direct-current power supply reach a preset alarm threshold value.
When the positive and negative poles of the device are grounded, the bridge balance is damaged, current flows through the bridge, and a grounding alarm signal is sent out.
In another embodiment of the present invention, the apparatus further includes a dc intelligent transformer configured on each dc branch for measuring leakage current, and when the detected current flowing into the dc intelligent transformer is different in magnitude, and the leakage current is not 0, the positive and negative ground insulation resistance values of the dc power supply are calculated.
The device also comprises a step of pushing the grounding alarm signal to a worker under the condition of sending the grounding alarm signal so that the worker can receive the alarm information in time to carry out alarm receiving processing.
According to a third aspect of the present invention, there is provided a balance bridge measurement method of a dc insulation detection system, comprising,
the direct-current insulation detection system is used for generating solving values of the direct-current power supply positive and negative electrode ground insulation resistance by adopting a balance bridge measuring circuit; wherein the content of the first and second substances,
a balanced bridge measurement circuit includes, in combination,
balancing bridge resistance and a system power on/off switch;
a change-over switch is arranged between the balanced bridge resistor and the bridge arm resistor, two static contacts of the change-over switch are respectively and electrically connected with two ends of a bridge circuit of the balanced bridge resistor, and a movable contact of the change-over switch is electrically connected with the bridge arm resistor;
the system direct-current power supply ground resistance comprises a system direct-current power supply positive bus ground resistance and a system direct-current power supply negative bus ground resistance, wherein the system direct-current power supply positive bus ground resistance and the system direct-current power supply negative bus ground resistance are respectively provided with a system power supply positive ground sampling detection terminal and a system power supply negative ground sampling detection terminal, the bridge arm resistance is provided with a bridge arm voltage sampling detection terminal, and the two static contacts are provided with bridge arm voltage difference sampling detection terminals in neutral positions.
According to the method provided by the invention, a grounding alarm signal is generated under the condition that the solved values of the positive and negative pole ground insulation resistances of the direct-current power supply reach a preset alarm threshold value.
That is, when the positive and negative electrodes are grounded, the bridge balance is broken, a current flows, and a ground alarm signal is generated.
In this embodiment, a dc intelligent transformer may be further configured on each dc branch for measuring leakage current, and when the detected current flowing into the dc transformer is different in magnitude, the positive and negative ground insulation resistance values of the dc power supply are calculated under the condition that the leakage current is not 0.
In the invention, the grounding alarm signal can be pushed to the working personnel under the condition of sending the grounding alarm signal, so that the working personnel can receive the alarm information in time to carry out alarm receiving processing.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be understood that the above detailed description of the technical solution of the present invention with the help of preferred embodiments is illustrative and not restrictive. On the basis of reading the description of the invention, a person skilled in the art can modify the technical solutions described in the embodiments, or make equivalent substitutions for some technical features; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A DC insulation detection system, characterized in that the system comprises a balance bridge measurement circuit, including,
balancing bridge resistance and a system power on/off switch;
a change-over switch is arranged between the balanced bridge resistor and the bridge arm resistor, two static contacts of the change-over switch are respectively and electrically connected with two ends of a bridge circuit of the balanced bridge resistor, and a movable contact of the change-over switch is electrically connected with the bridge arm resistor;
the system direct-current power supply ground resistance comprises a system direct-current power supply positive bus ground resistance and a system direct-current power supply negative bus ground resistance, wherein the system direct-current power supply positive bus ground resistance and the system direct-current power supply negative bus ground resistance are respectively provided with a system power supply positive ground sampling detection terminal and a system power supply negative ground sampling detection terminal, the bridge arm resistance is provided with a bridge arm voltage sampling detection terminal, and the two static contacts are provided with bridge arm voltage difference sampling detection terminals in neutral positions.
2. The system of claim 1,
the system also comprises a bridge arm voltage sampling detection point arranged on the bridge arm resistor, and a bridge arm voltage difference sampling detection point in a neutral position is arranged on the two static contacts.
3. The system of claim 1,
the system is used for balance bridge measurement and comprises a direct-current power supply positive pole and negative pole insulation resistance measurement solving value.
4. The system of claim 3,
and generating a grounding alarm signal under the condition that the solved values of the positive and negative pole grounding insulation resistances of the direct-current power supply reach a preset alarm threshold value.
5. The system of claim 1,
the system also comprises a power bridge which is damaged when the positive pole and the negative pole of the system are grounded, current flows through the power bridge, and a grounding alarm signal is sent out.
6. The system of claim 5,
the system also comprises a direct current intelligent mutual inductor which is configured on each direct current branch and used for measuring leakage current, and under the condition that the detected current flowing into the direct current mutual inductor is different in size, the positive and negative pole earth insulation resistance values of the direct current power supply are obtained through calculation under the condition that the leakage current is not 0.
7. The system of claim 5,
the system also comprises a step of pushing the grounding alarm signal to a worker under the condition of sending the grounding alarm signal so that the worker can receive the alarm information in time to carry out alarm receiving processing.
8. A DC insulation detection device, comprising: the main chip and a balance bridge measuring circuit connected with the main chip;
the balance bridge measuring circuit comprises a balance bridge resistor and a system power supply input/output switch;
a change-over switch is arranged between the balanced bridge resistor and the bridge arm resistor, two static contacts of the change-over switch are respectively and electrically connected with two ends of a bridge circuit of the balanced bridge resistor, and a movable contact of the change-over switch is electrically connected with the bridge arm resistor;
the system direct-current power supply ground resistance comprises a system direct-current power supply positive bus ground resistance and a system direct-current power supply negative bus ground resistance, wherein the system direct-current power supply positive bus ground resistance and the system direct-current power supply negative bus ground resistance are respectively provided with a system power supply positive ground sampling detection terminal and a system power supply negative ground sampling detection terminal, the bridge arm resistance is provided with a bridge arm voltage sampling detection terminal, and the two static contacts are provided with bridge arm voltage difference sampling detection terminals in neutral positions.
9. A balance bridge measurement method of a direct current insulation detection system is characterized by comprising the following steps,
generating solving values of the positive and negative pole ground insulation resistance of the direct-current power supply by adopting a balance bridge measuring circuit; wherein the content of the first and second substances,
a balanced bridge measurement circuit includes, in combination,
balancing bridge resistance and a system power on/off switch;
a change-over switch is arranged between the balanced bridge resistor and the bridge arm resistor, two static contacts of the change-over switch are respectively and electrically connected with two ends of a bridge circuit of the balanced bridge resistor, and a movable contact of the change-over switch is electrically connected with the bridge arm resistor;
the system direct-current power supply ground resistance comprises a system direct-current power supply positive bus ground resistance and a system direct-current power supply negative bus ground resistance, wherein the system direct-current power supply positive bus ground resistance and the system direct-current power supply negative bus ground resistance are respectively provided with a system power supply positive ground sampling detection terminal and a system power supply negative ground sampling detection terminal, the bridge arm resistance is provided with a bridge arm voltage sampling detection terminal, and the two static contacts are provided with bridge arm voltage difference sampling detection terminals in neutral positions.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114167140A (en) * | 2021-12-03 | 2022-03-11 | 国网江苏省电力有限公司常州供电分公司 | Method and system for detecting insulation resistance to ground of direct current system |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2546997A1 (en) * | 1975-10-21 | 1977-05-05 | Bureaux De Const De Relais Ele | DEVICE FOR INSULATION MONITORING OF NON EARTHED DC MAINS |
| SU1721540A1 (en) * | 1990-04-09 | 1992-03-23 | Конструкторское Бюро Электроприборостроения | Dc network insulation resistance tester |
| CN1687799A (en) * | 2005-04-06 | 2005-10-26 | 南京师范大学 | Combined detector and combined detecting method for switch state of DC ground resistance |
| CN101738560A (en) * | 2008-11-14 | 2010-06-16 | 南车株洲电力机车有限公司 | Unbalanced electric bridge-based grounding detection circuit for locomotive control loop |
| CN202676838U (en) * | 2012-05-10 | 2013-01-16 | 珠海市澳特尔测控仪表有限公司 | Novel direct current leakage current sensor |
| CN107046791A (en) * | 2016-02-05 | 2017-08-15 | 中国船舶重工集团公司第七�三研究所 | A kind of cold multi-inverter control system of ship liquid |
| CN206892190U (en) * | 2017-07-10 | 2018-01-16 | 龙海特尔福汽车电子研究所有限公司 | A kind of DC insulation monitoring instrument |
| CN108375711A (en) * | 2018-02-26 | 2018-08-07 | 南京华脉科技股份有限公司 | A kind of insulating monitoring method of bipolar earth-free HVDC power-supply systems |
| CN108693442A (en) * | 2018-05-17 | 2018-10-23 | 辽宁石油化工大学 | The detection method and system of electric network fault |
| CN208872843U (en) * | 2018-07-25 | 2019-05-17 | 杭州电力设备制造有限公司 | Non-equilibrium bridge measuring device for electric automobile charging pile Insulation Inspection System |
| CN110912114A (en) * | 2019-12-06 | 2020-03-24 | 国网江苏电力设计咨询有限公司 | High-safety low-voltage direct current system |
| CN211061633U (en) * | 2019-11-26 | 2020-07-21 | 国网湖北省电力有限公司黄石供电公司 | Direct current insulation monitoring device based on alternating current and direct current leakage current sensor |
-
2020
- 2020-12-21 CN CN202011518053.4A patent/CN112578186A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2546997A1 (en) * | 1975-10-21 | 1977-05-05 | Bureaux De Const De Relais Ele | DEVICE FOR INSULATION MONITORING OF NON EARTHED DC MAINS |
| SU1721540A1 (en) * | 1990-04-09 | 1992-03-23 | Конструкторское Бюро Электроприборостроения | Dc network insulation resistance tester |
| CN1687799A (en) * | 2005-04-06 | 2005-10-26 | 南京师范大学 | Combined detector and combined detecting method for switch state of DC ground resistance |
| CN101738560A (en) * | 2008-11-14 | 2010-06-16 | 南车株洲电力机车有限公司 | Unbalanced electric bridge-based grounding detection circuit for locomotive control loop |
| CN202676838U (en) * | 2012-05-10 | 2013-01-16 | 珠海市澳特尔测控仪表有限公司 | Novel direct current leakage current sensor |
| CN107046791A (en) * | 2016-02-05 | 2017-08-15 | 中国船舶重工集团公司第七�三研究所 | A kind of cold multi-inverter control system of ship liquid |
| CN206892190U (en) * | 2017-07-10 | 2018-01-16 | 龙海特尔福汽车电子研究所有限公司 | A kind of DC insulation monitoring instrument |
| CN108375711A (en) * | 2018-02-26 | 2018-08-07 | 南京华脉科技股份有限公司 | A kind of insulating monitoring method of bipolar earth-free HVDC power-supply systems |
| CN108693442A (en) * | 2018-05-17 | 2018-10-23 | 辽宁石油化工大学 | The detection method and system of electric network fault |
| CN208872843U (en) * | 2018-07-25 | 2019-05-17 | 杭州电力设备制造有限公司 | Non-equilibrium bridge measuring device for electric automobile charging pile Insulation Inspection System |
| CN211061633U (en) * | 2019-11-26 | 2020-07-21 | 国网湖北省电力有限公司黄石供电公司 | Direct current insulation monitoring device based on alternating current and direct current leakage current sensor |
| CN110912114A (en) * | 2019-12-06 | 2020-03-24 | 国网江苏电力设计咨询有限公司 | High-safety low-voltage direct current system |
Non-Patent Citations (3)
| Title |
|---|
| D.G. JARRETT: "Analysis of a dual-balance high-resistance bridge at 10 T/spl Omega", 《IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT》 * |
| 成林俞: "直流系统在线绝缘监测的研究及其实现", 《电子测量与仪器学报》 * |
| 甘江华: "基于组合桥的在线绝缘监测方法_", 《自动化仪表》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114167140A (en) * | 2021-12-03 | 2022-03-11 | 国网江苏省电力有限公司常州供电分公司 | Method and system for detecting insulation resistance to ground of direct current system |
| CN114167140B (en) * | 2021-12-03 | 2023-10-27 | 国网江苏省电力有限公司常州供电分公司 | Method and system for detecting insulation ground resistance of direct current system |
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