CN102346224B - Insulation monitor and monitoring method thereof - Google Patents
Insulation monitor and monitoring method thereof Download PDFInfo
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- CN102346224B CN102346224B CN 201010245114 CN201010245114A CN102346224B CN 102346224 B CN102346224 B CN 102346224B CN 201010245114 CN201010245114 CN 201010245114 CN 201010245114 A CN201010245114 A CN 201010245114A CN 102346224 B CN102346224 B CN 102346224B
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Abstract
The invention provides a monitor and a monitoring method thereof. The monitor comprises a first resistor, a first switch and a first sampling resistor which are connected in series with one another from a first bus to a ground wire, a second sampling resistor, a second switch and a second resistor which are connected in series with one another from the ground wire to a third bus, and a third resistor, a third switch and a third sampling resistor which are connected in series with one another from a second bus to the ground wire; and the monitoring method comprises the following steps of: measuring voltage between the first bus and the third bus, voltage between the second bus and the third bus, voltage between the first bus and the ground wire, voltage between the second bus and the ground wire and voltage between the ground wire and the third bus; and comparing the measured voltages, and judging whether the buses are grounded according to comparison results. By the monitor and the monitoring method, a grounding state of each of the three buses of a direct current system can be monitored in real time and processed timely, so damage caused by bus grounding can be avoided.
Description
Technical field
The present invention relates to a kind of insulating monitoring instrument and monitoring method thereof for the bus monitoring.
Background technology
In transformer station's day-to-day operation maintenance and abnormality processing work, the most complicated is exactly searching and handling of straight-flow system median generatrix ground connection.Can not impact device systems during bus generation one point earth, but if untimely it is searched processing, in case after 2 ground connection of bus occurring, just may be short-circuited, serious consequences such as error action of device, tripping.In the existing straight-flow system, commonly used to two buses or three buses, yet, present traditional monitoring instrument does not have the ground connection situation of three buses of real-time monitoring, make operating personnel be not easy in time search which bar busbar grounding and it is handled, can bring very big harm to straight-flow system like this.
Summary of the invention
The present invention can not monitor the whether technical matters of ground connection of each bar bus in three buses in real time for solving the traditional monitoring instrument, and a kind of insulating monitoring instrument and monitoring method thereof for three buses monitorings is provided.
The invention provides a kind of insulating monitoring instrument, the insulating monitoring that is used for bus-bar system, its observation circuit comprises first branch road that is connected between article one bus and the ground wire, be connected second branch road between the 3rd bus and the ground wire, be connected the 3rd branch road between second bus and the ground wire, described first branch road comprises by first resistance, the series circuit that first switch and first sampling resistor are formed, described second branch road comprises by second resistance, the series circuit that second switch and second sampling resistor are formed, described the 3rd branch road comprises by the 3rd resistance, the series circuit that the 3rd switch and the 3rd sampling resistor are formed;
Described first branch road is used for recording article one bus to the voltage between the ground wire according to the voltage at the first sampling resistor two ends, described second branch road is used for voltage according to the second sampling resistor two ends and records voltage between three buses of ground wire to the, described the 3rd branch road is used for recording the second bus to the voltage between the ground wire according to the voltage at the 3rd sampling resistor two ends, described first branch road and second branch road are used for voltage according to first sampling resistor and the second sampling resistor two ends and record voltage between three buses of article one bus to the, and described second branch road and the 3rd branch road are used for voltage according to second sampling resistor and the 3rd sampling resistor two ends and record voltage between three buses of second bus to the; And
The above-mentioned voltage that records compared and according to the ground connection situation of the bus bar number that inserts in the comparative result judgement system and each bar bus.
Further, described first resistance and first sampling resistor are made up of a resistance respectively at least, and described second resistance and second sampling resistor are made up of a resistance respectively at least, and described the 3rd resistance and the 3rd sampling resistor are made up of a resistance respectively at least.
Further, described first switch to the, eight switches are electric-controlled switch.
Further, described observation circuit also comprises the 4th switch, the 5th switch, the 6th switch, minion is closed and the 8th switch, described article one bus links to each other with first switch, one end by first resistance, the other end of first switch links to each other with the 4th switch one end with first sampling resistor, one end respectively, the other end ground wire of first sampling resistor, the other end of the 4th switch links to each other with the 6th switch one end with the 5th switch one end respectively, the other end of the 5th switch links to each other with the 3rd switch one end with the 3rd sampling resistor one end respectively, the other end ground wire of the 3rd sampling resistor, the other end of the 3rd switch links to each other with the second bus by the 3rd resistance, the other end of the 6th switch closes an end with ground wire and minion respectively and links to each other, the other end that minion is closed links to each other with the 8th switch one end, the other end of the 8th switch links to each other with second switch one end with second sampling resistor, one end respectively, the other end of second sampling resistor links to each other with ground wire, and the other end of second switch links to each other with the 3rd bus by second resistance.
The present invention also provides a kind of monitoring method of insulating monitoring instrument, may further comprise the steps:
Step 1: record the voltage U 1 between three buses of article one bus to the respectively, voltage U 2 between three buses of second bus to the, article one, bus is to the voltage U 3 between the ground wire, and the second bus is to the voltage U 4 between the ground wire, the voltage U 5 between three buses of ground wire to the;
Step 2: the above-mentioned U1 that records, U2, U3, U4 and U5 are compared, and according to the ground connection situation of the bus bar number that inserts in the comparative result judgement system and each bar bus.
After described step 2, further comprise: calculate the stake resistance that records ground strap by the electric resistance partial pressure principle.
Further, also comprise before the described step 1: the direction from article one bus to ground wire is connected in series first resistance, first switch and first sampling resistor successively, direction from three buses of ground wire to the is connected in series second sampling resistor, second switch and second resistance successively, and the direction from the second bus to ground wire is connected in series the 3rd resistance, the 3rd switch and the 3rd sampling resistor successively.
Further, the step that records the voltage U 1 between three buses of article one bus to the specifically comprises: closed first switch, second switch, record first sampling resistor and the second sampling resistor both end voltage, by the electric resistance partial pressure principle, try to achieve the voltage U 1 between three buses of article one bus to the again;
The step that records the voltage U 2 between three buses of second bus to the specifically comprises: closed second switch, the 3rd switch, record the 3rd sampling resistor and the second sampling resistor both end voltage, by the electric resistance partial pressure principle, try to achieve the voltage U 2 between three buses of second bus to the again;
Recording article one bus specifically comprises to the step of the voltage U 3 between the ground wire: closed first switch, record the first sampling resistor both end voltage, and by the electric resistance partial pressure principle, try to achieve article one bus to the voltage U 3 between the ground wire again;
Recording the second bus specifically comprises to the step of the voltage U 4 between the ground wire: closed the 3rd switch, record the 3rd sampling resistor both end voltage, and by the electric resistance partial pressure principle, try to achieve the second bus to the voltage U 4 between the ground wire again;
The step that records the voltage U 5 between three buses of ground wire to the specifically comprises: closed second switch, record the second sampling resistor both end voltage, and by the electric resistance partial pressure principle, try to achieve the voltage U 5 between three buses of ground wire to the again.
Further, described step 2 comprises: at first compare U1, U2 and zero relation, then further compare U3, U4 and U5 and zero relation according to above-mentioned comparative result, thus the ground connection situation of the bus bar number that inserts in the judgement system and each bar bus.
From monitor technical scheme of the present invention as can be seen, by first branch road is set between article one bus and the ground wire, article three, between bus and the ground wire second branch road is set, and the 3rd branch road is set between second bus and the ground wire, then record voltage U 1 between three buses of article one bus to the by above-mentioned branch road, voltage U 2 between three buses of second bus to the, article one, bus is to the voltage U 3 between the ground wire, the second bus is to the voltage U 4 between the ground wire, voltage U 5 between three buses of ground wire to the, at last to survey voltage U 1, U2, U3, U4 and U5 compare, and according to the ground connection situation of the bus bar number that inserts in the comparative result judgement system and each bar bus.Can make things convenient for the technician to monitor the ground connection situation of each bar bus in the straight-flow system in real time like this, and handle immediately, avoid busbar grounding to bring serious harm to straight-flow system.
From monitor monitoring method technical scheme of the present invention as can be seen, by recording the voltage U 1 between three buses of article one bus to the respectively, voltage U 2 between three buses of second bus to the, article one, bus is to the voltage U 3 between the ground wire, the second bus is to the voltage U 4 between the ground wire, the voltage U 5 between three buses of ground wire to the; And the above-mentioned U1 that records, U2, U3, U4 and U5 compared, according to the ground connection situation of the bus bar number that inserts in the comparative result judgement system and each bar bus.This method can be monitored the ground connection situation of each bar bus in the straight-flow system easily in real time, and be convenient to the technician and immediately it handled, thus the grievous injury of avoiding busbar grounding to bring.
Description of drawings
Embodiment one structural drawing that Fig. 1 provides for monitor of the present invention;
Embodiment two structural drawing that Fig. 2 provides for monitor of the present invention;
Embodiment three structural drawing that Fig. 3 provides for monitor of the present invention.
Embodiment
In order to make technical matters solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
Embodiment one structural drawing that Fig. 1 provides for monitor of the present invention, consult Fig. 1 as can be known, monitor provided by the invention, its observation circuit comprises first branch road that is connected between bus HM and the ground wire GND, be connected second branch road between ground wire GND and the bus FM, be connected the 3rd branch road between bus KM and the ground wire GND, described first branch road comprises the resistance R 1 that is connected in series successively to ground wire GND direction from bus HM, K switch 1 and sampling resistor R11, the second branch road comprises the resistance R 2 that is connected in series successively to bus FM direction from ground wire GND, K switch 2 and sampling resistor R22, the 3rd branch road comprises the resistance R 3 that is connected in series successively to ground wire GND direction from bus KM, K switch 3 and sampling resistor R33.Described first branch road is used for recording bus HM to the voltage between the ground wire GND according to sampling resistor R11 both end voltage, described second branch road is used for recording ground wire GND to the voltage between the bus FM according to sampling resistor R22 both end voltage, described the 3rd branch road is used for recording bus KM to the voltage between the ground wire GND according to sampling resistor R33 both end voltage, described first branch road and second branch road are used for recording bus HM to the voltage between the bus FM according to sampling resistor R11 and sampling resistor R22 both end voltage, described second branch road and the 3rd branch road are used for recording bus KM to the voltage between the bus FM according to sampling resistor R33 and sampling resistor R22 both end voltage, the above-mentioned voltage that records are compared and according to the ground connection situation of the bus bar number that inserts in the comparative result judgement system and each bar bus.
In concrete the enforcement, above-mentioned resistance R 1 and sampling resistor R11 can comprise at least one resistance, the resistance that for example can comprise two or more serial or parallel connections, in like manner resistance R 2, resistance R 3, sampling resistor R22 and R33 also can be made up of a resistance, perhaps the resistance of two or more serial or parallel connections is formed, in addition, above-mentioned K switch 1 to K switch 8 can be electric-controlled switch all, need not manually-operated.
Embodiment two structural drawing that Fig. 2 provides for monitor of the present invention, consult this figure as can be known, this embodiment and embodiment one are basic identical, difference only is a place, bus KM is obtained by dropping equipment by bus HM, under this state, bus HM is higher than bus KM to the voltage between the bus FM to the voltage between the bus FM.Because this embodiment and embodiment one are basic identical, therefore do not do repeated description at this.
Embodiment three structural drawing that Fig. 3 provides for monitor of the present invention, as shown in Figure 3: its observation circuit comprises first branch road that is connected between bus HM and the ground wire GND, be connected second branch road between ground wire GND and the bus FM, be connected the 3rd branch road between bus KM and the ground wire GND, described first branch road comprises the resistance R 1 that is connected in series successively to ground wire GND direction from bus HM, K switch 1 and sampling resistor R11, the second branch road comprises the sampling resistor R22 that is connected in series successively to bus FM direction from ground wire GND, 2, the three branch roads of K switch 2 and resistance R comprise the resistance R 3 that is connected in series successively to ground wire GND direction from bus KM, K switch 3 and sampling resistor R33.Its median generatrix HM links to each other with K switch 1 one ends by resistance R 1, the other end of K switch 1 links to each other with K switch 4 one ends with sampling resistor R11 one end respectively, the other end ground wire GND of sampling resistor R11, the other end of K switch 4 links to each other with K switch 6 one ends with K switch 5 one ends respectively through the A point, the other end of K switch 5 links to each other with K switch 3 one ends with sampling resistor R33 one end respectively, the other end ground wire GND of sampling resistor R33, the other end of K switch 3 links to each other with bus KM by resistance R 3, the other end of K switch 6 links to each other with K switch 7 one ends with ground wire GND respectively, the other end of K switch 7 links to each other with K switch 8 one ends through the B point, the other end of K switch 8 links to each other with K switch 2 one ends with sampling resistor R22 one end respectively, the other end of sampling resistor R22 links to each other with ground wire GND, and the other end of K switch 2 links to each other with bus FM by resistance R 2.Described first branch road is used for recording bus HM to the voltage between the ground wire GND according to sampling resistor R11 both end voltage, described second branch road is used for recording ground wire GND to the voltage between the bus FM according to sampling resistor R22 both end voltage, described the 3rd branch road is used for recording bus KM to the voltage between the ground wire GND according to sampling resistor R33 both end voltage, described first branch road and second branch road are used for recording bus HM to the voltage between the bus FM according to sampling resistor R11 and sampling resistor R22 both end voltage, described second branch road and the 3rd branch road are used for recording bus KM to the voltage between the bus FM according to sampling resistor R33 and sampling resistor R22 both end voltage, the above-mentioned voltage that records are compared and according to the ground connection situation of the bus bar number that inserts in the comparative result judgement system and each bar bus.
This embodiment compares with embodiment two, mainly be to have increased K switch 4, K switch 5, K switch 6, K switch 7 and K8, different circuit by above switch and first branch road, second branch road and the formation of the 3rd branch road, each voltage that only need record A, B point-to-point transmission can be tried to achieve ground wire GND to the voltage between the bus FM by calculating, bus KM is to the voltage between the ground wire GND, bus HM is to the voltage between the bus FM, bus KM to the voltage between the bus FM and bus HM to the voltage between the ground wire GND.And the voltage of A, B point-to-point transmission can be sent into the Chip Microcomputer A converter again by isolation, filtering, get final product as calculated, so just bring convenience to recording voltage, do not need voltage of every survey to move the pressure measurement position one time.
The monitoring method of monitor of the present invention may further comprise the steps:
Step 1: record bus HM respectively to the voltage U 1 between the bus FM, bus KM is to the voltage U 2 between the bus FM, and bus HM is to the voltage U 3 between the ground wire GND, and bus KM is to the voltage U 4 between the ground wire GND, and ground wire GND is to the voltage U 5 between the bus FM;
Step 2: the above-mentioned U1 that records, U2, U3, U4 and U5 are compared, and according to the ground connection situation of the bus bar number that inserts in the comparative result judgement system and each bar bus.
In concrete the enforcement, before step 1, from bus HM to ground wire GND direction series resistor R1 successively, K switch 1 and sampling resistor R11, be connected in series sampling resistor R22, K switch 2 and resistance R 2 from ground wire GND successively to bus FM direction, the direction from bus KM to ground wire GND is series resistor R3, K switch 3 and sampling resistor R33 (as shown in Figure 1 and Figure 2) successively.Branch road as described in Figure 3 can certainly be set between three buses, because this part is described in detail, therefore, not do specific descriptions at this in the monitor scheme.
In specifically implementing, step 2 further comprises: at first compare U1, U2 and zero relation, then further compare U3, U4 and U5 and zero relation according to above-mentioned comparative result, thus the ground connection situation of the bus bar number that inserts in the judgement system and each bar bus.
Describe the monitoring method of monitor of the present invention in detail with the form of embodiment below in conjunction with Fig. 2 and Fig. 3.
Learn that from Fig. 2 and Fig. 3 because bus KM is obtained by dropping equipment by bus HM, therefore bus HM is higher than bus KM to the voltage between the bus FM to the voltage between the bus FM as can be known.
Embodiment four:
Step 20: from bus HM to ground wire GND direction series resistor R1 successively, K switch 1 and sampling resistor R11, be connected in series sampling resistor R22, K switch 2 and resistance R 2 from ground wire GND successively to bus FM direction, from bus KM to ground wire GND direction series resistor R3 successively, K switch 3 and sampling resistor R33 (see figure 2).
Step 11:
Closing Switch K1, K switch 2 record sampling resistor R11 and R22 both end voltage, by the electric resistance partial pressure principle, try to achieve bus HM to the voltage U 1 between the bus FM again;
Closing Switch K2, K switch 3 record sampling resistor R33 and R22 both end voltage, by the electric resistance partial pressure principle, try to achieve bus KM to the voltage U 2 between the bus FM again;
Closing Switch K1 records sampling resistor R11 both end voltage, by the electric resistance partial pressure principle, tries to achieve bus HM to the voltage U 3 between the ground wire GND again;
Closing Switch K3 records sampling resistor R33 both end voltage, by the electric resistance partial pressure principle, tries to achieve bus KM to the voltage U 4 between the ground wire GND again;
Closing Switch K2 records sampling resistor R22 both end voltage, by the electric resistance partial pressure principle, tries to achieve ground wire GND to the voltage U 5 between the bus FM again.
Step 12: the above-mentioned U1 that records, U2, U3, U4 and U5 are compared, and according to the ground connection situation of the bus bar number that inserts in the comparative result judgement system and each bar bus.It specifically comprises:
When U1＞0, U2＞0, and U1＞U2, then determine to insert in the system three buses, and bus HM is higher than bus KM to the voltage between the bus FM to the voltage between the bus FM, then compares U3, U4 and U5 and zero relation, thus which bar busbar grounding in the judgement system;
When U1＞0, U2=0 determines that then system has only inserted bus HM and bus FM, then compares U3 and U5 and zero relation, thus which bar busbar grounding in the judgement system;
Work as U1=0, U2＞0 determines that then system has only inserted bus KM and bus FM, then compares U4 and U5 and zero relation, thus which bar busbar grounding in the judgement system.
Further, when U1＞0, U2＞0, and U1＞U2, further judge:
1. U3=0, U4=0, U5=0 judges three bus insulation against ground;
2. U3=0, U4＜0, U5＞0 because of U3=0, does not have grounding phenomenon so can judge bus KM, bus FM; U4＜0th, because this state Down Highway HM links to each other by stake resistance with ground wire GND, pressure drop is (U2-U1) * R33/[R3+R33+ (HM stake resistance) between A, B], because B point current potential is higher than the A point, so voltage is negative value between A, B; U5＞0th is because under this state, bus HM links to each other by stake resistance with ground wire GND, voltage is the U1*R22/[(HM stake resistance between A, B point)+R2+R22], by above analysis, can judge and have only bus HM ground connection, by formula (U1-U5) * (R2+R22)/U5, can obtain bus HM resistance to earth value.
3. U3＞0, U4=0, U5＞0 in like manner can be judged and have only bus KM ground connection, by formula (U2-U5) * (R2+R22)/U5, can obtain KM resistance to earth value;
4. U3＞0, U5=0, U4＞0 in like manner can be judged and have only bus FM ground connection, by formula (U1-U3) * (R1+R11)/U3, can obtain bus FM resistance to earth value;
5. U3＞0, U4＞0, at least two busbar groundings are judged in U5＞0.
Further, when U1＞0, U2=0, further judge:
1. U3=0, U5=0 judges two bus insulation against ground.
2. U3=0, bus HM ground connection is judged in U5＞0, by formula (U1-U5) * (R2+R22)/U5, can obtain bus HM resistance to earth value;
3. U3＞0, U5=0 judges bus FM ground connection, by formula (U1-U3) * (R1+R11)/U3, can obtain bus FM resistance to earth value;
4. U3＞0, bus HM is judged in U5＞0, the equal ground connection of bus FM can be obtained HM resistance to earth value by formula (U1-U5) * (R2+R22)/U5, by formula (U1-U3) * (R1+R11)/U3, can obtain bus FM resistance to earth value again;
Further, work as U1=0, U2＞0, further judge:
1. U4=0, U5=0 then can judge two bus insulation against ground.
2. U4=0, bus KM ground connection then can be judged in U5＞0, by formula (U1-U5) * (R2+R22)/U5, can obtain bus KM resistance to earth value;
3. U4＞0, U5=0 then can judge bus FM ground connection, by formula (U1-U4) * (R3+R33)/U4, can obtain bus FM resistance to earth value;
4. U4＞0, bus KM then can be judged in U5＞0, the equal ground connection of bus FM can be obtained bus KM resistance to earth value by formula (U1-U5) * (R2+R22)/U5, can obtain bus FM resistance to earth value by formula (U1-U4) * (R3+R33)/U4 again;
In above-described embodiment, there is a kind of situation, when U1＞0, U2＞0, and U1＞U2, U3＞0, U4＞0, at least two busbar groundings can only be judged in U5＞0 o'clock, in order to know concrete which two busbar grounding, can do further judgement to it, concrete grammar is as follows:
Stop bus HM power supply earlier, record U4 and U5 again, then judge:
1. U4=0, bus KM ground connection then can be judged in U5＞0, by formula (U1-U5) * (R2+R22)/U5, can obtain bus KM resistance to earth value;
2. U4＞0, U5=0 then can judge bus FM ground connection, by formula (U1-U4) * (R3+R33)/U4, can obtain bus FM resistance to earth value;
3. U4＞0, bus KM then can be judged in U5＞0, the equal ground connection of bus FM can be obtained bus KM resistance to earth value by formula (U1-U5) * (R2+R22)/U5, can obtain bus FM resistance to earth value by formula (U1-U4) * (R3+R33)/U4 again;
Recover bus HM power supply again, stop bus KM power supply, record U3 and U5 again, then judge:
1. U3=0, bus HM ground connection is judged in U5＞0, by formula (U1-U5) * (R2+R22)/U5, can obtain bus HM resistance to earth value;
2. U3＞0, U5=0 judges bus FM ground connection, by formula (U1-U3) * (R1+R11)/U3, can obtain bus FM resistance to earth value;
3. U3＞0, bus HM is judged in U5＞0, the equal ground connection of bus FM can be obtained HM resistance to earth value by formula (U1-U5) * (R2+R22)/U5, by formula (U1-U3) * (R1+R11)/U3, can obtain bus FM resistance to earth value again;
Perhaps
Stop bus FM power supply earlier, record U3 and U5 again, then judge:
1. U3=0, bus HM ground connection is judged in U5＞0, by formula (U1-U5) * (R2+R22)/U5, can obtain bus HM resistance to earth value;
2. U3＞0, U5=0 judges bus FM ground connection, by formula (U1-U3) * (R1+R11)/U3, can obtain bus FM resistance to earth value;
3. U3＞0, bus HM is judged in U5＞0, the equal ground connection of bus FM can be obtained HM resistance to earth value by formula (U1-U5) * (R2+R22)/U5, by formula (U1-U3) * (R1+R11)/U3, can obtain bus FM resistance to earth value again;
Recover bus FM power supply again, stop bus HM power supply, record U4 and U5 again, then judge:
1. U4=0, bus KM ground connection then can be judged in U5＞0, by formula (U1-U5) * (R2+R22)/U5, can obtain bus KM resistance to earth value;
2. U4＞0, U5=0 then can judge bus FM ground connection, by formula (U1-U4) * (R3+R33)/U4, can obtain bus FM resistance to earth value;
3. U4＞0, bus KM then can be judged in U5＞0, the equal ground connection of bus FM can be obtained KM resistance to earth value by formula (U1-U5) * (R2+R22)/U5, can obtain bus FM resistance to earth value by formula (U1-U4) * (R3+R33)/U4 again;
Embodiment five:
Step 20: from bus HM to ground wire GND direction series resistor R1 successively, K switch 1 and sampling resistor R11, be connected in series sampling resistor R22, K switch 2 and resistance R 2 from ground wire GND successively to bus FM direction, from bus KM to ground wire GND direction series resistor R3 successively, K switch 3 and sampling resistor R33.Its median generatrix HM links to each other with K switch 1 one ends by resistance R 1, the other end of K switch 1 links to each other with K switch 4 one ends with sampling resistor R11 one end respectively, the other end ground wire GND of sampling resistor R11, the other end of K switch 4 links to each other with K switch 6 one ends with K switch 5 one ends respectively through the A point, the other end of K switch 5 links to each other with K switch 3 one ends with sampling resistor R33 one end respectively, the other end ground wire GND of sampling resistor R33, the other end of K switch 3 links to each other with bus KM by resistance R 3, the other end of K switch 6 links to each other with K switch 7 one ends with ground wire GND respectively, the other end of K switch 7 links to each other with K switch 8 one ends through the B point, the other end of K switch 8 links to each other with K switch 2 one ends with sampling resistor R22 one end respectively, the other end of sampling resistor R22 links to each other with ground wire GND, and the other end of K switch 2 links to each other with bus FM by resistance R 2.
Step 21:
Closing Switch K1, K switch 2, K switch 4 and K switch 8, A, B point-to-point transmission voltage are sent into the Chip Microcomputer A converter by isolation, filtering, try to achieve bus HM as calculated to the voltage U 1 between the bus FM;
Closing Switch K2, K switch 3, K switch 5 and K switch 8, the same bus KM that tries to achieve is to the voltage U 2 between the bus FM;
Closing Switch K1, K switch 4 and K switch 7, at this moment, HM links to each other with ground wire GND by resistance R 1, sampling resistor R11, and KM and FM all do not have grounding phenomenon as if this moment, and then resistance R 1 and sampling resistor R11 go up no pressure drop, if KM or FM have grounding phenomenon, then resistance R 1, sampling resistor R11 and stake resistance can form the loop, on the sampling resistor R22 pressure drop are arranged, and namely between A, the B pressure drop are arranged, this pressure drop is sent into the Chip Microcomputer A converter and can be tried to achieve bus HM to the voltage U 3 between the ground wire GND through isolation, filtering;
Closing Switch K3, K switch 5 and K switch 7, the same bus KM that tries to achieve is to the voltage U 4 between the ground wire GND;
Closing Switch K2, K switch 6 and K switch 8, the same ground wire GND that tries to achieve is to the voltage U 5 between the bus FM.
Step 22: this step is identical with the step 12 of embodiment four, therefore in this omission.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. insulating monitoring instrument, the insulating monitoring that is used for bus-bar system, it is characterized in that, its observation circuit comprises first branch road that is connected between article one bus and the ground wire, be connected second branch road between the 3rd bus and the ground wire, be connected the 3rd branch road between second bus and the ground wire, described first branch road comprises by first resistance, the series circuit that first switch and first sampling resistor are formed, described second branch road comprises by second resistance, the series circuit that second switch and second sampling resistor are formed, described the 3rd branch road comprises by the 3rd resistance, the series circuit that the 3rd switch and the 3rd sampling resistor are formed; Wherein, also comprise the 4th switch, the 5th switch, the 6th switch, minion is closed and the 8th switch, described article one bus links to each other with first switch, one end by first resistance, the other end of first switch links to each other with the 4th switch one end with first sampling resistor, one end respectively, the other end ground wire of first sampling resistor, the other end of the 4th switch links to each other with the 6th switch one end with the 5th switch one end respectively, the other end of the 5th switch links to each other with the 3rd switch one end with the 3rd sampling resistor one end respectively, the other end ground wire of the 3rd sampling resistor, the other end of the 3rd switch links to each other with the second bus by the 3rd resistance, the other end of the 6th switch closes an end with ground wire and minion respectively and links to each other, the other end that minion is closed links to each other with the 8th switch one end, the other end of the 8th switch links to each other with second switch one end with second sampling resistor, one end respectively, the other end of second sampling resistor links to each other with ground wire, and the other end of second switch links to each other with the 3rd bus by second resistance; Described first branch road is used for recording article one bus to the voltage between the ground wire according to the voltage at the first sampling resistor two ends, described second branch road is used for voltage according to the second sampling resistor two ends and records voltage between three buses of ground wire to the, described the 3rd branch road is used for recording the second bus to the voltage between the ground wire according to the voltage at the 3rd sampling resistor two ends, described first branch road and second branch road are used for voltage according to first sampling resistor and the second sampling resistor two ends and record voltage between three buses of article one bus to the, and described second branch road and the 3rd branch road are used for voltage according to second sampling resistor and the 3rd sampling resistor two ends and record voltage between three buses of second bus to the; And
The above-mentioned voltage that records compared and according to the ground connection situation of the bus bar number that inserts in the comparative result judgement system and each bar bus.
2. insulating monitoring instrument according to claim 1, it is characterized in that, described first resistance and first sampling resistor are made up of a resistance respectively at least, described second resistance and second sampling resistor are made up of a resistance respectively at least, and described the 3rd resistance and the 3rd sampling resistor are made up of a resistance respectively at least.
3. insulating monitoring instrument according to claim 1 is characterized in that, described first switch to the, eight switches are electric-controlled switch.
4. the monitoring method of an insulating monitoring instrument is characterized in that, may further comprise the steps:
Step 1: record the voltage U 1 between three buses of article one bus to the respectively, voltage U 2 between three buses of second bus to the, article one, bus is to the voltage U 3 between the ground wire, and the second bus is to the voltage U 4 between the ground wire, the voltage U 5 between three buses of ground wire to the;
Step 2: at first compare U1, U2 and zero relation, then further compare U3, U4 and U5 and zero relation according to above-mentioned comparative result, thus the ground connection situation of the bus bar number that inserts in the judgement system and each bar bus.
5. the monitoring method of insulating monitoring instrument according to claim 4 is characterized in that, further comprises after described step 2: calculate the stake resistance that records ground strap by the electric resistance partial pressure principle.
6. the monitoring method of insulating monitoring instrument according to claim 4 is characterized in that, further comprises before described step 1:
Direction from article one bus to ground wire is connected in series first resistance, first switch and first sampling resistor successively, direction from three buses of ground wire to the is connected in series second sampling resistor, second switch and second resistance successively, and the direction from the second bus to ground wire is connected in series the 3rd resistance, the 3rd switch and the 3rd sampling resistor successively.
7. the monitoring method of insulating monitoring instrument according to claim 4 is characterized in that,
The step that records the voltage U 1 between three buses of article one bus to the specifically comprises: closed first switch, second switch, record first sampling resistor and the second sampling resistor both end voltage, by the electric resistance partial pressure principle, try to achieve the voltage U 1 between three buses of article one bus to the again;
The step that records the voltage U 2 between three buses of second bus to the specifically comprises: closed second switch, the 3rd switch, record the 3rd sampling resistor and the second sampling resistor both end voltage, by the electric resistance partial pressure principle, try to achieve the voltage U 2 between three buses of second bus to the again;
Recording article one bus specifically comprises to the step of the voltage U 3 between the ground wire: closed first switch, record the first sampling resistor both end voltage, and by the electric resistance partial pressure principle, try to achieve article one bus to the voltage U 3 between the ground wire again;
Recording the second bus specifically comprises to the step of the voltage U 4 between the ground wire: closed the 3rd switch, record the 3rd sampling resistor both end voltage, and by the electric resistance partial pressure principle, try to achieve the second bus to the voltage U 4 between the ground wire again;
The step that records the voltage U 5 between three buses of ground wire to the specifically comprises: closed second switch, record the second sampling resistor both end voltage, and by the electric resistance partial pressure principle, try to achieve the voltage U 5 between three buses of ground wire to the again.
8. the monitoring method of insulating monitoring instrument according to claim 4 is characterized in that, step 2 specifically comprises:
Work as U1〉0, U2〉0, and U1 U2, then determine to insert in the system three buses, and article one the voltage between three buses of bus to the is higher than the voltage between three buses of second bus to the, then compares U3, U4 and U5 and zero relation, thus which bar busbar grounding in the judgement system;
Work as U1〉0, U2〉0, and U1＜U2, then determine to insert in the system three buses, and article one the voltage between three buses of bus to the is lower than the voltage between three buses of second bus to the, then compares U3, U4 and U5 and zero relation, thus which bar busbar grounding in the judgement system;
Work as U1〉0, U2=0 determines that then system has only inserted article one bus and the 3rd bus, then compares U3 and U5 and zero relation, thus which bar busbar grounding in the judgement system;
Work as U1=0, U2＞0 determines that then system has only inserted second bus and the 3rd bus, then compares U4 and U5 and zero relation, thus which bar busbar grounding in the judgement system.
9. the monitoring method of insulating monitoring instrument according to claim 8 is characterized in that, works as U1〉0, U2〉0, and U1 U2, further judge:
1. U3=0, U4=0, U5=0 judges three bus insulation against ground;
2. U3=0, U4＜0, U5〉0, judge and have only article one busbar grounding;
3. U3〉0, U4=0, U5〉0, judge and have only the second busbar grounding;
4. U3〉0, U5=0, U4〉0, judge and have only the 3rd busbar grounding;
5. U3〉0, U4〉0, U5〉0, judge at least two busbar groundings.
10. the monitoring method of insulating monitoring instrument according to claim 8 is characterized in that, works as U1〉0, U2〉0, and U1＜U2, further judge:
1. U3=0, U4=0, U5=0 judges three bus insulation against ground;
2. U3=0, U4〉0, U5〉0, judge and have only article one busbar grounding;
3. U3＜0, U4=0, U5〉0, judge and have only the second busbar grounding;
4. U3〉0, U5=0, U4〉0, judge and have only the 3rd busbar grounding;
5. U3〉0, U4〉0, U5〉0, judge at least two busbar groundings.
11. the monitoring method according to claim 9 or 10 described insulating monitoring instrument is characterized in that, works as U3〉0, U4〉0, U5〉0,
Stop article one bussed supply earlier, record U4 and U5 again, make the following judgment:
1. U4=0, U5〉0, can judge that then the second bus has grounding phenomenon;
2. U4〉0, U5=0 then can judge the 3rd busbar grounding phenomenon;
3. U4〉0, U5〉0, then can judge the second bus, the 3rd the equal ground connection of bus;
Recover article one bussed supply again, stop the second bussed supply, record U3 and U5 again, make the following judgment:
1. U3=0, U5〉0, judge that article one bus has grounding phenomenon;
2. U3〉0, U5=0 judges the 3rd busbar grounding phenomenon;
3. U3〉0, U5〉0, judge article one bus, the 3rd the equal ground connection of bus;
Perhaps
Stop the second bussed supply earlier, record U3 and U5 again, make the following judgment:
1. U3=0, U5〉0, judge that article one bus has grounding phenomenon;
2. U3〉0, U5=0 judges the 3rd busbar grounding phenomenon;
3. U3〉0, U5〉0, judge article one bus, the 3rd the equal ground connection of bus;
Recover the second bussed supply again, stop article one bussed supply, record U4 and U5 again, make the following judgment:
1. U4=0, U5〉0, can judge that then the second bus has grounding phenomenon;
2. U4〉0, U5=0 then can judge the 3rd busbar grounding phenomenon;
3. U4〉0, U5〉0, then can judge the second bus, the 3rd the equal ground connection of bus.
12. the monitoring method of insulating monitoring instrument according to claim 8 is characterized in that, works as U1〉0, U2=0, further judge:
1. U3=0, U5=0 judges two bus insulation against ground;
2. U3=0, U5〉0, judge that article one bus has grounding phenomenon;
3. U3〉0, U5=0 judges the 3rd busbar grounding phenomenon;
4. U3〉0, U5〉0, judge article one bus, the 3rd the equal ground connection of bus.
13. the monitoring method of insulating monitoring instrument according to claim 8 is characterized in that, works as U1=0, U2＞0 is further judged:
1. U4=0, U5=0 then can judge two bus insulation against ground;
2. U4=0, U5〉0, can judge that then the second bus has grounding phenomenon;
3. U4〉0, U5=0 then can judge the 3rd busbar grounding phenomenon;
4. U4〉0, U5〉0, then can judge the second bus, the 3rd the equal ground connection of bus.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103048579B (en) * | 2012-11-08 | 2015-05-06 | 珠海泰坦科技股份有限公司 | Monitoring device for insulation between direct-current buses and between buses and ground |
| CN103389444B (en) * | 2013-07-24 | 2016-02-03 | 中达电通股份有限公司 | Based on the switching type insulating monitoring error adaptive approach of voltage prediction |
| CN103698651B (en) * | 2013-12-27 | 2016-05-11 | 国家电网公司 | A kind ofly supervise method and the device that D.C. isolation bus is altered mutually |
| CN105548798B (en) * | 2016-02-29 | 2018-12-07 | 珠海格力电器股份有限公司 | The ground detecting method and device of DC bus |
| CN107305224A (en) * | 2016-04-19 | 2017-10-31 | 台达电子企业管理（上海）有限公司 | Insulation resistance detection circuit, detection method and the photovoltaic DC-to-AC converter of photovoltaic DC-to-AC converter |
| 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 |
| CN111585265B (en) * | 2020-06-03 | 2022-09-30 | 广东电网有限责任公司惠州供电局 | Secondary equipment test power supply safe starting protection device and application |
| CN113917366B (en) * | 2021-12-13 | 2022-03-22 | 宁波均胜新能源汽车技术有限公司 | Interphase short circuit detection circuit and detection method for three-phase charging pile wall box |
| CN117129741B (en) * | 2023-10-27 | 2024-01-02 | 石家庄科林电气股份有限公司 | Method for collecting voltage to ground of bus of direct current system and electronic equipment |
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| EP2138854A1 (en) * | 2008-06-26 | 2009-12-30 | Deere & Company | Apparatus and method of determining insulation resistance in an ungrounded mobile vehicle electrical bus system |
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| JPH0450295A (en) * | 1990-06-18 | 1992-02-19 | Ishikawajima Harima Heavy Ind Co Ltd | Dry type desulfurizing device |
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| EP2138854A1 (en) * | 2008-06-26 | 2009-12-30 | Deere & Company | Apparatus and method of determining insulation resistance in an ungrounded mobile vehicle electrical bus system |
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