CN206411215U - A kind of D.C. isolation monitoring device - Google Patents
A kind of D.C. isolation monitoring device Download PDFInfo
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- CN206411215U CN206411215U CN201720000936.3U CN201720000936U CN206411215U CN 206411215 U CN206411215 U CN 206411215U CN 201720000936 U CN201720000936 U CN 201720000936U CN 206411215 U CN206411215 U CN 206411215U
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- resistance
- leakage current
- straight
- flow system
- electrode bus
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Abstract
The utility model is related to a kind of D.C. isolation monitoring device.The device that purpose is to provide can detect the earth fault of straight-flow system, and with easy to use, as a result accurate technical characterstic, so as to improve the security of system.Technical scheme is：A kind of D.C. isolation monitoring device, it is characterised in that：Including master chip and connected leakage current detection circuit, voltage sampling circuit, peripheral circuit；The leakage current detection circuit includes several leakage current sensors, each leakage current sensor is separately mounted on each bar branch road of straight-flow system, the positive pole inlet wire and negative pole inlet wire of corresponding branch road are installed, the output end of leakage current sensor is connected with master chip in the input perforation of each leakage current sensor；Voltage sampling circuit includes the balanced bridge, balanced bridge regulation circuit and filter circuit being sequentially connected, and balanced bridge is connected in the positive electrode bus and negative electrode bus of straight-flow system, and filter circuit is connected with master chip.
Description
Technical field
The utility model is related to a kind of D.C. isolation monitoring device, the D.C. isolation monitoring that especially computer room first cabinet of each row is used
(first cabinet of each row is the rack of a row cabinet equipment foremost to device, is that the exchange to this row rack or DC load are carried
Power supply source, play distributing function).
Background technology
Straight-flow system is the important part of telecom operators' cloud data communication computer room, the security reliability of straight-flow system
The safe operation of cloud data communication computer room is affected, is related to the safety in production of whole power network.The direct current of cloud data communication computer room
Systematic comparison is complicated, and terminal box, operation machine with the inside and outside power distribution equipment in relay protection, recoil simulator, automatics and room
Structure etc. is connected, therefore, occurs earth fault chance more.When occurring one-point grounding fault, because no short circuit current flow flows through,
System will not be caused harm, so system remains to continue to run with.But this earth fault must be found early, otherwise work as hair
During raw another one-point grounding fault, it is possible to cause the incorrect operation of signal circuit, control loop, relay protection etc., so as to make
Into heavy losses.
Utility model content
The technical problems to be solved in the utility model is to overcome the shortcomings of that above-mentioned background technology is supervised there is provided a kind of D.C. isolation
Device is surveyed, the earth fault of straight-flow system can be detected, and with easy to use, as a result accurate technical characterstic, so as to carry
The security of high system.
The technical solution adopted in the utility model is：
A kind of D.C. isolation monitoring device, it is characterised in that：Including master chip and connected leakage current detection circuit,
Voltage sampling circuit, peripheral circuit；The leakage current detection circuit includes several leakage current sensors, each leakage current sensor
It is separately mounted on each bar branch road of straight-flow system, corresponding branch road is installed in the input perforation of each leakage current sensor
Positive pole inlet wire and negative pole inlet wire, the output end of leakage current sensor is connected with master chip；Voltage sampling circuit includes connecting successively
The balanced bridge that connects, balanced bridge regulation circuit and filter circuit, balanced bridge be connected to straight-flow system positive electrode bus and
On negative electrode bus, filter circuit is connected with master chip.
Preferably, the balanced bridge include the normally opened contact of a relay being sequentially connected in series, resistance, No. two
The normally opened contact of relay, No. two resistance, the normally opened contact of relay and the positive electrode bus of straight-flow system are connected, No. two electricity
Resistance is connected with the negative electrode bus of straight-flow system, and the earth is connect by wire between a resistance and the normally opened contact of No. two relays.
Preferably, balanced bridge regulation circuit includes two-way, the first via by be sequentially connected No. three, No. four, five
The positive electrode bus of number resistance and a rheostat composition, No. three resistance and straight-flow system is connected, a rheostat and direct current system
The negative electrode bus connection of system, between No. four, No. five resistance by the normally opened contact of wire and a resistance and No. two relays it
Between connect, No. six resistance that secondary route is sequentially connected and No. two rheostats compositions, the positive pole of No. six resistance and straight-flow system
Bus is connected, and the negative electrode bus of No. two rheostats and straight-flow system is connected.
Preferably, the filter circuit includes a RC filter circuit and No. two RC filter circuits；Each RC filtering
Circuit includes a resistance and two electric capacity, and two electric capacity are connected to the two ends of resistance, and the other end of two electric capacity connects
Then negative electrode bus；Wherein, one end of No. seven resistance of a RC filter circuit is connected with master chip, the other end and a variable resistance
The slide plate connection of device, one end of No. eight resistance of No. two RC filter circuits is connected with master chip, the other end and No. two it is rheostatic
Slide plate is connected.
Preferably, the control end of No. one, No. two relay is connected with master chip.
The beneficial effects of the utility model are as follows：The utility model can complete to examine the leakage current of each branch road
Survey, but also the voltage-to-ground between positive electrode bus and negative electrode bus can be detected, and according to the change of voltage-to-ground,
Resistance to earth is calculated with reference to leakage current, as a result accurately, the safety of straight-flow system can be effectively ensured, it is easy to use.
Brief description of the drawings
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of voltage sampling circuit.
Fig. 3 is the circuit theory diagrams of leakage current detection circuit.
Embodiment
The utility model is described in further detail below, but the utility model is not limited to following examples.
As shown in figure 1, a kind of D.C. isolation monitoring device, including master chip 3 and connected leakage current detection circuit,
Voltage sampling circuit 7, peripheral circuit 4 (peripheral circuit is not described), master chip pass through RS485 interface circuits 2 and straight-flow system
1 controller is connected and communicated.
As shown in figure 3, the leakage current detection circuit includes several leakage current sensors 6, each leakage current sensor point
Corresponding branch An Zhuan not be installed in the input perforation 6-1 of each leakage current sensor on each bar branch road of straight-flow system
The positive pole inlet wire 9-1 and negative pole inlet wire 9-2 on road, the output end of leakage current sensor pass through RS485 interface circuits 5 and master chip
Connection.
As shown in Fig. 2 voltage sampling circuit include be sequentially connected balanced bridge 7-1, balanced bridge regulation circuit 7-2 with
And filter circuit 7-3, balanced bridge is connected on the positive electrode bus 8-1 and negative electrode bus 8-2 of straight-flow system, filter circuit with
Master chip is connected.
The balanced bridge includes the normally opened contact for a relay JK1 being sequentially connected in series, resistance R1, No. two relays
Device JK2 normally opened contact, No. two resistance R2, the normally opened contact of relay and the positive electrode bus of straight-flow system are connected, No. two
Resistance and the negative electrode bus of straight-flow system are connected, the control end of No. one, No. two relay be connected with master chip (No. one, two
Number relay can use AQW214 light coupling relays chip).Pass through between a number resistance and the normally opened contact of No. two relays
Wire connects the earth, so as to form a resistance to earth between positive electrode bus and the earth, is formed between negative electrode bus and the earth
No. two resistance to earth.
Balanced bridge regulation circuit includes two-way, the first via by No. three resistance R3 being sequentially connected, No. four resistance R4,
The positive electrode bus of No. five resistance R5 and rheostat RW1 compositions, No. three resistance and straight-flow system is connected, a rheostat with
The negative electrode bus connection of straight-flow system, passes through the normally opened of wire and a resistance and No. two relays between No. four, No. five resistance
Connected between contact, No. six resistance R6 and No. two rheostat RW2 compositions, No. six resistance and direct current that secondary route is sequentially connected
The negative electrode bus of the positive electrode bus connection of system, No. two rheostats and straight-flow system is connected.A number rheostat and No. two rheostats
The resistance of circuit can be accessed according to varying DC link voltage.
The filter circuit includes a RC filter circuit and No. two RC filter circuits；Each RC filter circuits include one
Individual resistance and two electric capacity, two electric capacity are connected to the two ends of resistance, and the other end of two electric capacity is connected to negative pole mother
Line；Wherein, No. seven resistance R7 of RC filter circuit one end is connected with master chip and a diode, the other end and one
Number rheostatic slide plate connection, No. eight resistance R8 of No. two RC filter circuits one end and master chip and No. two diodes connect
Connect, the other end is connected with No. two rheostatic slide plates.
When light coupling relay chip AQW214 1,2 pin conducting, when 7,8 pin are also switched on, and the internal resistance very little of conducting.
Similarly, when 3,4 pin are turned on, when 5,6 pin are also switched on.Moreover, light coupling relay chip AQW214 pressure voltage can reach
400V, i.e., when 7,8 or 5,6 are not turned on, their two ends can bear 400V voltage.Master chip by export low and high level come
Control the conducting of light coupling relay chip AQW214 1,2 pin and reach the conducting and shut-off for controlling normally opened contact JK1.Similarly,
Master chip can control light coupling relay chip AQW214 3,4 pin to turn on and reach control normally opened contact JK2 conductings and shut-off.
When normally opened contact JK1, JK2 disconnect, master chip samples the voltage Um between positive electrode bus and negative electrode bus, then by normally opened
Contact JK1 disconnects, JK2 closures sample the voltage Uj at No. two resistance (while being also No. two resistance to earth) two ends, in conjunction with adopting
Sample to leakage current numerical computations go out insulaion resistance R+, R-.Calculation formula is：R+=(Um-Uj)/IForward leakage current；R-=Uj/
INegative sense leakage current。
Finally it should be noted that listed above is only specific embodiment of the utility model.Obviously, this practicality is new
Type is not limited to above example, can also there is many variations.One of ordinary skill in the art can be from disclosed in the utility model
All deformations for directly exporting or associating in content, are considered as protection domain of the present utility model.
Claims (5)
1. a kind of D.C. isolation monitoring device, it is characterised in that：Including master chip (3) and connected leakage current test electricity
Road, voltage sampling circuit (7), peripheral circuit (4)；The leakage current detection circuit includes several leakage current sensors (6), respectively
Leakage current sensor is separately mounted on each bar branch road of straight-flow system (1), the input perforation (6-1) of each leakage current sensor
The positive pole inlet wire (9-1) and negative pole inlet wire (9-2) of corresponding branch road, the output end of leakage current sensor and main core are inside installed
Piece is connected；Voltage sampling circuit includes the balanced bridge (7-1), balanced bridge regulation circuit (7-2) and filtering being sequentially connected
Circuit (7-3), balanced bridge is connected to (8-2), filter circuit and master on the positive electrode bus of straight-flow system (8-1) and negative electrode bus
Chip is connected.
2. a kind of D.C. isolation monitoring device according to claim 1, it is characterised in that：The balanced bridge is included successively
The normally opened contact of a number relay (JK1) of series connection, resistance (R1), normally opened contact, No. two electricity of No. two relays (JK2)
Hinder (R2), the normally opened contact of relay and the positive electrode bus of straight-flow system are connected, the negative pole of No. two resistance and straight-flow system
Bus is connected, and the earth is connect by wire between a resistance and the normally opened contact of No. two relays.
3. a kind of D.C. isolation monitoring device according to claim 2, it is characterised in that：The balanced bridge adjusts circuit
Including two-way, the first via is by be sequentially connected No. three, No. four, No. five resistance (R3, R4, R5) and rheostat (RW1) group
Into, the positive electrode bus connection of No. three resistance and straight-flow system, the negative electrode bus connection of a rheostat and straight-flow system, No. four,
By being connected between wire and a resistance and the normally opened contact of No. two relays between No. five resistance, secondary route is sequentially connected
No. six resistance (R6) and No. two rheostats (RW2) composition, the positive electrode bus of No. six resistance and straight-flow system connects, No. two changes
The negative electrode bus for hindering device and straight-flow system is connected.
4. a kind of D.C. isolation monitoring device according to claim 3, it is characterised in that：The filter circuit includes No. one
RC filter circuits and No. two RC filter circuits；Each RC filter circuits include a resistance and two electric capacity, two electric capacity
The two ends of resistance are connected to, the other end of two electric capacity is connected to negative electrode bus；Wherein, No. seven of a RC filter circuit
One end of resistance (R7) is connected with master chip, and the other end is connected with a rheostatic slide plate, No. eight of No. two RC filter circuits
One end of resistance (R8) is connected with master chip, and the other end is connected with No. two rheostatic slide plates.
5. a kind of D.C. isolation monitoring device according to claim 4, it is characterised in that：Described No. one, No. two relays
Control end be connected with master chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720000936.3U CN206411215U (en) | 2017-01-03 | 2017-01-03 | A kind of D.C. isolation monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720000936.3U CN206411215U (en) | 2017-01-03 | 2017-01-03 | A kind of D.C. isolation monitoring device |
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| Publication Number | Publication Date |
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| CN206411215U true CN206411215U (en) | 2017-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720000936.3U Active CN206411215U (en) | 2017-01-03 | 2017-01-03 | A kind of D.C. isolation monitoring device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633357A (en) * | 2019-01-10 | 2019-04-16 | 许继电源有限公司 | More busbar grounding insulated monitoring methods and monitoring device in triple bus-bar |
| CN109633360A (en) * | 2019-01-10 | 2019-04-16 | 许继电源有限公司 | Single busbar ground insulation monitoring method and monitoring device in triple bus-bar |
| CN110504656A (en) * | 2019-07-12 | 2019-11-26 | 国网浙江省电力有限公司嘉兴供电公司 | A kind of overcurrent protective device of DC earthing |
| CN110514945A (en) * | 2019-07-12 | 2019-11-29 | 国网浙江省电力有限公司嘉兴供电公司 | A kind of multifunctional DC grounding test apparatus and Method for Measuring Insulating Resistance |
| CN110596559A (en) * | 2019-10-12 | 2019-12-20 | 积成电子股份有限公司 | Time-sharing grounding multi-balance bridge-based direct current bus and feeder line monitoring method |
| CN116859289A (en) * | 2023-09-04 | 2023-10-10 | 国网江苏省电力有限公司常州供电分公司 | Ground fault detection device for direct current system of transformer substation |
-
2017
- 2017-01-03 CN CN201720000936.3U patent/CN206411215U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633357A (en) * | 2019-01-10 | 2019-04-16 | 许继电源有限公司 | More busbar grounding insulated monitoring methods and monitoring device in triple bus-bar |
| CN109633360A (en) * | 2019-01-10 | 2019-04-16 | 许继电源有限公司 | Single busbar ground insulation monitoring method and monitoring device in triple bus-bar |
| CN109633357B (en) * | 2019-01-10 | 2021-06-18 | 许继电源有限公司 | Method and device for monitoring grounding insulation of multiple buses in three buses |
| CN110504656A (en) * | 2019-07-12 | 2019-11-26 | 国网浙江省电力有限公司嘉兴供电公司 | A kind of overcurrent protective device of DC earthing |
| CN110514945A (en) * | 2019-07-12 | 2019-11-29 | 国网浙江省电力有限公司嘉兴供电公司 | A kind of multifunctional DC grounding test apparatus and Method for Measuring Insulating Resistance |
| CN110596559A (en) * | 2019-10-12 | 2019-12-20 | 积成电子股份有限公司 | Time-sharing grounding multi-balance bridge-based direct current bus and feeder line monitoring method |
| CN110596559B (en) * | 2019-10-12 | 2021-08-03 | 积成电子股份有限公司 | Time-sharing grounding multi-balance bridge-based direct current bus and feeder line monitoring method |
| CN116859289A (en) * | 2023-09-04 | 2023-10-10 | 国网江苏省电力有限公司常州供电分公司 | Ground fault detection device for direct current system of transformer substation |
| CN116859289B (en) * | 2023-09-04 | 2023-11-14 | 国网江苏省电力有限公司常州供电分公司 | Ground fault detection device for direct current system of transformer substation |
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