CN203178410U - DC insulation detecting device - Google Patents

DC insulation detecting device Download PDF

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Publication number
CN203178410U
CN203178410U CN 201220687024 CN201220687024U CN203178410U CN 203178410 U CN203178410 U CN 203178410U CN 201220687024 CN201220687024 CN 201220687024 CN 201220687024 U CN201220687024 U CN 201220687024U CN 203178410 U CN203178410 U CN 203178410U
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CN
China
Prior art keywords
circuit
detection
bus
insulation
unbalanced
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201220687024
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Chinese (zh)
Inventor
赵永康
卢朝晖
王璐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
XINXIANG XINDIAN POWER TECHNOLOGY Co Ltd
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XINXIANG XINDIAN POWER TECHNOLOGY Co Ltd
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Publication date
Application filed by XINXIANG XINDIAN POWER TECHNOLOGY Co Ltd filed Critical XINXIANG XINDIAN POWER TECHNOLOGY Co Ltd
Priority to CN 201220687024 priority Critical patent/CN203178410U/en
Application granted granted Critical
Publication of CN203178410U publication Critical patent/CN203178410U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a DC insulation detecting device including bus grounding voltage to ground, a signal processing circuit, a leakage current sensor, a multi-channel switching circuit, a single-chip microprocessor, a balanced bridge or an unbalanced bridge and a photoelectric isolator. The DC insulation detecting device is characterized in that no low frequency AC signals needs to be input when the technical scheme is adopted for detecting ground connection of a DC branch circuit; a balanced detection method and an unbalanced detection method are combined together and the balanced detection method is defaulted as a main working mode while the unbalanced detection method is defaulted to an auxiliary working mode; unbalanced detection is performed firstly in a DC insulation detecting process; if DC bus insulation is normal, the working mode turns to the long-term balanced detection and is then switched to the unbalanced detection after a certain period; and if the DC bus insulation is still normal, the working model turns to the balanced detection method. By adopting the technical scheme, the contemporary ground connection of a DC positive bus and a DC negative bus can be detected and a problem that voltages to earth of the DC positive bus and the DC negative bus are not stable is also solved. The DC insulation detecting device provided by the utility model is novel and unique in structure, high in computing power, high in performance and low in cost.

Description

The D.C. isolation pick-up unit
Technical field
The utility model relates to the pick-up unit of DC power system in a kind of electric system, relates in particular to a kind of D.C. isolation pick-up unit of the Detection ﹠ Controling to DC earthing.
Background technology
Straight-flow system is to be applied to waterpower, fuel-burning power plant; all kinds of transformer stations and other use the user of DC equipment, provide the power-supply device of direct supply for giving signalling arrangement, protection, aut.eq., emergency lighting, emergency power pack and isolating switch branch, closing operation.Straight-flow system is an independently power supply, and it is not subjected to the influence of generator station service and system operation mode, and under the situation that externally alternating current interrupts, assurance is continued to provide the visual plant of direct supply by back-up source-accumulator.Direct supply is as very huge of the emergency power supply of electric equipments and its branch feeding network of control signal power supply.
In the ordinary course of things; one point earth does not influence the operation of straight-flow system; if but can not find earth fault rapidly and repaired; another earth fault takes place again; the misoperation that causes signal circuit, control loop, protective relaying device etc. enlarges thing group scope, just may cause the generation of significant trouble.The existing method that detects the straight-flow system insulation mainly contains bridge balance principle and low-frequency acquisition principle.The insulation monitoring and warning device of realizing according to the bridge balance principle is widely used, but it can not detect the situation the when insulation of straight-flow system positive and negative electrode is equal to descend; Even insulation monitoring and warning device is reported to the police, can not directly obtain system's insulation resistance size over the ground.Be a kind of new method that adopted in recent years with low-frequency acquisition principle detection of ground faults, but the stake resistance that it can detect is subjected to the straight-flow system restriction of distributed capacitance over the ground, and low-frequency ac signal is subjected to extraneous interference, the ripple coefficient of voltage of the low-frequency ac signal increase straight-flow system of injecting in addition easily.As seen, all there are some defectives that are difficult to overcome in bridge balance principle and low-frequency acquisition principle.
Summary of the invention
The utility model provides a kind of new integrated circuit technique on the basis of above-mentioned technological deficiency, it is good to have sensitivity, the D.C. isolation pick-up unit that reliability is high.
The utility model D.C. isolation pick-up unit, comprise: the bus voltage-to-ground, signal processing circuit, leakage current sensor, multi-way switch circuit, single-chip microcomputer, balanced bridge or unbalanced bridge, relay indicating light, the address arranges circuit, the alarm output circuit, relay, photoisolator, the RS485 communicating circuit, wherein: bus voltage-to-ground and signal processing circuit, leakage current sensor and multi-way switch circuit, alarm output circuit and relay, photoisolator and RS485 communicating circuit, be connected on the single-chip microcomputer balanced bridge or unbalanced bridge after the serial connection respectively, relay indicating light and address arrange circuit and are connected on the single-chip microcomputer.Its characteristics are: single-chip microcomputer is ATmega32, performance was up to 16 MIPS when it worked in 16 MHz, the In-System Programmable Flash of 32K byte, the EEPROM of 1024 bytes, the internal SRAM of 2K byte, 8 tunnel 10 ADC, programmable watchdog timer with individual sheets internal oscillator, six kinds of sleep patterns, this single-chip microcomputer can be according to the working method control electric bridge of setting, make it be operated in balance mode or uneven mode, the address arranges by the toggle switch setting, this unit can be according to using the needs flexible expansion, the direct current positive and negative busbar voltage-to-ground of bus voltage-to-ground send single-chip microcomputer inner ADC sampling through signal processing circuit, the leakage current sensor signal switches 4 circuit by multichannel to be selected to send single-chip microcomputer inner ADC sampling after the processing, single-chip microcomputer calculates positive and negative busbar ground connection resistance according to positive and negative busbar voltage-to-ground 1, if bus insulation reduces, signal sampling value according to leakage current sensor calculates each branch road ground connection resistance again, judge concrete ground connection branch road, single-chip microcomputer passes through RS485 communication serial line interface with direct current positive and negative busbar voltage-to-ground, the positive and negative busbar resistance to earth, sending DC power on the information such as each direct current branch resistance to earth and ground connection branch road always monitors, as the foundation of DC power chief inspector keyholed back plate reason power-supply system and handling failure alarm, receive the alarm parameter setting value of the total monitoring of DC power simultaneously.RS485 communication serial line interface built in light electric isolator has greatly strengthened antijamming capability.
When this technical scheme detects direct current branch ground connection, need not inject low-frequency ac signal, balance detection and the uneven dual mode that detects are combined, the acquiescence working method is based on balance detection, and uneven the detection is auxilliary.Carrying out imbalance during this D.C. isolation testing earlier detects, detect dc bus whether ground connection is arranged, direct current positive and negative busbar ground connection simultaneously particularly, if the dc bus insulation is normal, the long-term work mode that then transfers balance detection to, enter uneven the detection at interval behind the certain hour again, if bus insulation is still normal, enter the balance detection mode again.Entering the uneven gap periods that detects can set according to real needs.This scheme can detect direct current positive and negative busbar ground connection simultaneously, overcome again direct current positive bus over the ground, the negative busbar voltage-to-ground problem of always beating, be the innovation of D.C. isolation detection range.
This D.C. isolation pick-up unit can also can directly be set at balance detection or uneven detection mode according to different customer demands.Multichannel output high frequency switch power is selected in the power supply of each functional circuit for use, and input voltage range is wide, can realize that 110V system, 220V system share.This utility model novel structure uniqueness, computing power is strong, performance is expensive low.
Description of drawings
Accompanying drawing 1 is the theory structure synoptic diagram of this device
Embodiment
Below in conjunction with description of drawings the utility model is further elaborated.
A kind of D.C. isolation pick-up unit described in the utility model, comprise: bus voltage-to-ground 1, signal processing circuit 2, leakage current sensor 3, multi-way switch circuit 4, single-chip microcomputer 5, balanced bridge or unbalanced bridge 6, relay indicating light 7, the address arranges circuit 8, alarm output circuit 9, relay 10, photoisolator 11, RS485 communicating circuit 12, wherein: bus voltage-to-ground 1 and signal processing circuit 2, leakage current sensor 3 and multi-way switch circuit 4, alarm output circuit 9 and relay 10, photoisolator 11 and RS485 communicating circuit 12, be connected on the single-chip microcomputer 5 balanced bridge or unbalanced bridge 6 after the serial connection respectively, relay indicating light 7 and address arrange circuit 8 and are connected on the single-chip microcomputer.During concrete work, this single-chip microcomputer 5 can be according to the working method control electric bridge of setting, make it be operated in balance mode or uneven mode, the direct current positive and negative busbar voltage-to-ground of bus voltage-to-ground 1 is sent to single-chip microcomputer 5 inner ADC samplings through signal processing circuit 2, after being selected to handle by multi-way switch circuit 4, leakage current sensor 3 signals send single-chip microcomputer 5 inner ADC samplings, single-chip microcomputer 5 calculates positive and negative busbar ground connection resistance according to positive and negative busbar voltage-to-ground 1, if bus insulation reduces, signal sampling value according to leakage current sensor 3 calculates each branch road ground connection resistance again, judge concrete ground connection branch road, the balanced bridge that is connected with single-chip microcomputer 5 or unbalanced bridge 6 acquiescence working methods are based on balance detection, and uneven the detection is auxilliary.Carrying out imbalance during this D.C. isolation testing earlier detects, detect dc bus whether ground connection is arranged, direct current positive and negative busbar ground connection simultaneously particularly, if the dc bus insulation is normal, the long-term work mode that then transfers balance detection to, enter uneven the detection at interval behind the certain hour again, if bus insulation is still normal, enter the balance detection mode again.Entering the uneven gap periods that detects can set according to real needs.Relay indicating light 7 glimmers when operate as normal in this process, is used for fault and judges, if fault is arranged, then by relay 10 signal is passed to alarm output circuit 9 in the testing process, and photoisolator 11 is used for strengthening antijamming capability at signals transmission.Single-chip microcomputer 5 is always monitored sending DC power on the information such as direct current positive and negative busbar voltage-to-ground 1, positive and negative busbar resistance to earth, each direct current branch resistance to earth and ground connection branch road by RS485 communicating circuit 12 serial line interfaces, as the foundation of DC power chief inspector keyholed back plate reason power-supply system and handling failure alarm, receive the alarm parameter setting value of the total monitoring of DC power simultaneously.

Claims (1)

1. D.C. isolation pick-up unit, comprise: bus voltage-to-ground (1), signal processing circuit (2), leakage current sensor (3), multi-way switch circuit (4), single-chip microcomputer (5), balanced bridge or unbalanced bridge (6), relay indicating light (7), the address arranges circuit (8), alarm output circuit (9), relay (10), photoisolator (11), RS485 communicating circuit (12), its characteristics are: described bus voltage-to-ground (1) and signal processing circuit (2), leakage current sensor (3) and multi-way switch circuit (4), alarm output circuit (9) and relay (10), photoisolator (11) and RS485 communicating circuit (12) are connected on the single-chip microcomputer (5) after the serial connection respectively; Described balanced bridge or unbalanced bridge (6), relay indicating light (7) and address arrange circuit (8) and are connected on the single-chip microcomputer, and single-chip microcomputer (5) can make it be operated in balance mode or uneven mode according to the working method control electric bridge of setting.
CN 201220687024 2012-12-12 2012-12-12 DC insulation detecting device Expired - Fee Related CN203178410U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220687024 CN203178410U (en) 2012-12-12 2012-12-12 DC insulation detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220687024 CN203178410U (en) 2012-12-12 2012-12-12 DC insulation detecting device

Publications (1)

Publication Number Publication Date
CN203178410U true CN203178410U (en) 2013-09-04

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CN 201220687024 Expired - Fee Related CN203178410U (en) 2012-12-12 2012-12-12 DC insulation detecting device

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103592563A (en) * 2013-11-22 2014-02-19 国家电网公司 Direct current system insulation on-line monitoring device
CN104375069A (en) * 2014-11-25 2015-02-25 常熟市五爱电器设备有限公司 240V high-voltage direct current insulation monitoring system
CN104678264A (en) * 2013-11-30 2015-06-03 中国科学院沈阳自动化研究所 Online insulation detection and fault processing device and method of AUV (Autonomous Underwater Vehicle) direct-current power supply system
CN105044575A (en) * 2015-08-12 2015-11-11 兰州海红技术股份有限公司 High-voltage direct-current power distribution insulation-against-ground monitoring device
CN105158661A (en) * 2015-09-01 2015-12-16 国网吉林省电力有限公司延边供电公司 Insulation fault positioning monitoring device of direct-current power supply system
CN106054048A (en) * 2016-07-21 2016-10-26 兰州海红技术股份有限公司 Direct current 240/336V master control device
CN108562814A (en) * 2018-04-24 2018-09-21 广东电网有限责任公司 A kind of resistance device for DC system grounding experiment
CN108572278A (en) * 2017-03-14 2018-09-25 深圳市艾华迪技术有限公司 The detection circuit and its detection method of DC bus insulation against ground resistance
CN111007298A (en) * 2019-12-06 2020-04-14 积成电子股份有限公司 Remote signaling acquisition implementation method of relay protection device with adjustable starting value

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103592563A (en) * 2013-11-22 2014-02-19 国家电网公司 Direct current system insulation on-line monitoring device
CN104678264A (en) * 2013-11-30 2015-06-03 中国科学院沈阳自动化研究所 Online insulation detection and fault processing device and method of AUV (Autonomous Underwater Vehicle) direct-current power supply system
CN104375069A (en) * 2014-11-25 2015-02-25 常熟市五爱电器设备有限公司 240V high-voltage direct current insulation monitoring system
CN105044575A (en) * 2015-08-12 2015-11-11 兰州海红技术股份有限公司 High-voltage direct-current power distribution insulation-against-ground monitoring device
CN105158661A (en) * 2015-09-01 2015-12-16 国网吉林省电力有限公司延边供电公司 Insulation fault positioning monitoring device of direct-current power supply system
CN106054048A (en) * 2016-07-21 2016-10-26 兰州海红技术股份有限公司 Direct current 240/336V master control device
CN106054048B (en) * 2016-07-21 2019-03-15 兰州海红技术股份有限公司 Direct current 240/336V master control set
CN108572278A (en) * 2017-03-14 2018-09-25 深圳市艾华迪技术有限公司 The detection circuit and its detection method of DC bus insulation against ground resistance
CN108562814A (en) * 2018-04-24 2018-09-21 广东电网有限责任公司 A kind of resistance device for DC system grounding experiment
CN111007298A (en) * 2019-12-06 2020-04-14 积成电子股份有限公司 Remote signaling acquisition implementation method of relay protection device with adjustable starting value

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130904

Termination date: 20141212

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