CN211426628U - Transmission line loss monitoring terminal - Google Patents
Transmission line loss monitoring terminal Download PDFInfo
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- CN211426628U CN211426628U CN201921273478.6U CN201921273478U CN211426628U CN 211426628 U CN211426628 U CN 211426628U CN 201921273478 U CN201921273478 U CN 201921273478U CN 211426628 U CN211426628 U CN 211426628U
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Abstract
The utility model belongs to the technical field of detecting instrument, a transmission line monitor terminal is proposed, including the measurement chip, still include current sampling circuit, current sampling circuit is the same four ways, be A phase current sampling circuit respectively, B phase current sampling circuit, C phase current sampling circuit and well line current sampling circuit, wherein A phase current sampling circuit includes current transformer and conditioning circuit, still include voltage sampling circuit, voltage sampling circuit is the same three routes, be A phase voltage sampling circuit respectively, B phase voltage sampling circuit and C phase voltage sampling circuit, A phase voltage sampling circuit includes positive end sampling circuit and negative end sampling circuit. Through the technical scheme, the problem that the monitoring data of the power transmission line in the prior art is inaccurate is solved.
Description
Technical Field
The utility model belongs to the technical field of detecting instrument, a transmission line loss monitor terminal is related to.
Background
With the rapid development of social economy, various industries put higher requirements on the quality and quantity of power supply, and due to the uncertainty of the environment of a power transmission line in a power grid, whether the operation of the power transmission line is safe or not becomes an important index of the reliability of the power grid. The monitoring of the power transmission line can find the hidden trouble of the line in time, so that the hidden trouble of the line can be eliminated as early as possible.
SUMMERY OF THE UTILITY MODEL
The utility model provides a transmission line loss monitor terminal has solved the unsafe problem of transmission line monitoring data among the prior art.
The technical scheme of the utility model is realized like this: comprises that
A metering chip is arranged on the measuring chip,
the current sampling circuits are four same circuits and respectively comprise an A-phase current sampling circuit, a B-phase current sampling circuit, a C-phase current sampling circuit and a neutral current sampling circuit, wherein the A-phase current sampling circuit comprises a current transformer and a conditioning circuit, the conditioning circuit comprises a fifty-fifth resistor and a fifty-sixth resistor, one end of the fifty-fifth resistor and one end of the fifty-sixth resistor are both connected with GND, one end of the fifty-fifth resistor, which is far away from GND, is connected with a first pin of the current transformer, and one end of the fifty-sixth resistor, which is far away from GND, is connected with a second pin of the current transformer,
the first pin of the current transformer is also connected with one end of a twenty-second resistor, the other end of the twenty-second resistor is connected with the metering chip, the second pin of the current transformer is also connected with one end of a thirty-third resistor, the other end of the thirty-third resistor is connected with the metering chip,
the voltage sampling circuit is three paths which are the same and respectively comprises an A phase voltage sampling circuit, a B phase voltage sampling circuit and a C phase voltage sampling circuit, the A phase voltage sampling circuit comprises a positive end sampling circuit and a negative end sampling circuit, the positive end sampling circuit comprises a sixty eight resistor, a sixty nine resistor, a seventy one resistor, a seventy two resistor, a seventy three resistor and a fourth resistor which are sequentially connected between an A phase line and a GND, one end of the fourth resistor, which is far away from the GND, is connected with the metering chip,
the negative end sampling circuit comprises a forty-second resistor, one end of the forty-second resistor is connected with GND, and the other end of the forty-second resistor is connected with the metering chip.
Furthermore, one end of the twenty-second resistor, which is far away from the current transformer, and one end of the thirty-third resistor, which is far away from the current transformer, are connected with the GND through filter capacitors.
Furthermore, one end of the fourth resistor, which is far away from the GND, and one end of the forty-second resistor, which is far away from the GND, are connected with the GND through a filter capacitor.
The LED lamp is characterized by further comprising a pulse output circuit, wherein the pulse output circuit comprises a first optical coupler, the input end of the first optical coupler is connected with the metering chip, and the output end of the first optical coupler is used for driving the LED lamp.
Further, still include master control circuit and GPRS communication circuit, the measurement chip with master control circuit connects, GPRS communication circuit is including the GPRS interface chip and the e-SIM card that connect gradually, GPRS interface chip still with master control circuit connects.
Further, still include GPRS power supply circuit, GPRS power supply circuit includes first switch tube, third switch tube, second diode and eighteenth diode, the base of first switch tube with master control circuit connects, the collecting electrode of first switch tube with the grid of third switch tube is connected, the drain electrode and the DC power supply of third switch tube are connected, the source electrode of third switch tube with the positive pole of second diode is connected, the negative pole of second diode with the positive pole of eighteenth diode is connected, the negative pole of eighteenth diode with the power pin of GPRS interface chip is connected.
Further, still include RS485 communication circuit, RS485 communication circuit includes receiving channel, transmitting channel, difference passageway and isolation power supply circuit, the receiving channel with the transmitting channel all with master control circuit connects, the receiving channel includes optical coupler two, the transmitting channel includes optical coupler three, the difference passageway is connected with isolation power supply circuit, the difference passageway is used for being connected with external circuit.
Further, the master control circuit comprises a master control chip and an RTC power supply circuit, the RTC power supply circuit comprises a fifth switching tube, a seventeenth diode and a third diode, the base of the fifth switching tube is connected with the anode of the seventeenth diode, the cathode of the seventeenth diode is connected with a second direct current power supply, the second direct current power supply is also connected with the anode of the third diode, the cathode of the third diode is connected with the master control chip,
and the collector of the fifth switching tube is connected with the main control chip, and the emitter of the fifth switching tube is connected with the anode of the battery.
The utility model discloses a theory of operation and beneficial effect do:
1. the utility model discloses well electric current sampling circuit includes four the same sampling passageways, samples the electric current of A looks, B looks, C looks and central line respectively, and voltage sampling circuit includes the same three passageway, samples the voltage of circuit A looks, B looks and C looks respectively, and voltage and electric current sampling signal send into respectively and measure the chip and carry out the calculation of electric energy. The utility model discloses measured electric energy value and ammeter measured electric energy value are than, if the difference is too big, then can judge the ammeter trouble, should in time carry out the ammeter change, avoid the ammeter trouble to cause inaccurate to transmission line's monitoring data.
The utility model discloses well current transformer includes two pins, wherein the electric current of first pin output is through fifty-fifth resistance, the electric current of second pin is through fifty-sixth resistance, because of the one end of fifty-fifth resistance and the one end of fifty-sixth resistance all are connected with GND, voltage IAP at fifty-fifth resistance both ends and the voltage IAN at fifty-sixth resistance both ends are the voltage signal that the size equals, opposite direction, IAP and IAN send into the pin that the measurement chip corresponds as differential input, such design is favorable to improving the accuracy of measurement chip calculation result.
Similarly, the voltage UAP at the two ends of the fourth resistor and the voltage UAN at the two ends of the forty-second resistor in the voltage sampling circuit are voltage signals with equal magnitude and opposite directions, and the two paths of differential signals are respectively sent to the corresponding pins of the metering chip, so that the accuracy of the calculation result of the metering chip is improved.
The utility model discloses an accurate measurement of electric energy, simple structure, fault rate are low moreover, can realize the effective monitoring to ammeter measured data to transmission line data monitoring's accuracy has been improved.
2. The utility model discloses well twenty two resistance keep away from current transformer's one end, thirty resistance keep away from current transformer's one end all through filter capacitance and GND connection, are favorable to the high frequency interference of circuit between filtering current sampling circuit and the metering chip, further ensure the accuracy of metering chip computational result.
3. The utility model discloses the one end that well fourth resistance kept away from GND, the one end that GND was kept away from to the fortieth second resistance all is connected with GND through filter capacitance, is favorable to the high frequency interference of circuit between filtering voltage sampling circuit and the metering chip, further ensures the accuracy of metering chip computational result.
4. The utility model discloses well metering chip's computational result can be through pulse signal's form output, and this pulse signal passes through an optical coupler drive external LED lamp, makes the LED lamp scintillation, and the flicker frequency who consequently observes the LED lamp just can audio-visual understanding electric energy value, and then is convenient for judge the behavior of ammeter. The optical coupler realizes the electrical isolation between the metering chip and an external circuit, and is favorable for ensuring the accuracy of the calculation result of the metering chip.
5. The utility model discloses well measurement chip sends the measurement result for master control circuit, and master control circuit sends the measurement result for the host computer through GPRS communication circuit, and the host computer can save data, is convenient for monitor the measured data in a period to there is a clear complete understanding to transmission line's operational aspect.
6. The utility model discloses in when needing to start the power of GPRS interface chip, master control circuit sends high level signal, and the projecting pole and the collecting electrode of first switch pipe switch on, and the grid of third switch pipe is the low level, and the drain electrode and the source electrode of third switch pipe switch on, and DC power supply first provides the power through second diode and eighteenth diode step-down back, for GPRS interface chip.
7. Through RS485 communication circuit, can be a plurality of the utility model discloses monitor terminal cascades, is convenient for a plurality of the utility model discloses monitor terminal carries out centralized monitoring. Receiving channel includes optical coupler two, sending channel and includes optical coupler three, and the difference passageway is connected with the isolation power, and such design has realized the utility model discloses monitor terminal avoids the influence of external interference signal with external circuit's electrical isolation the utility model discloses a work.
8. The RTC is arranged in the main control chip, accurate real-time clock information is provided for the whole system, the RTC can still work normally when power is off, and the positive pole of the battery is connected to the corresponding pin of the main control chip through the fifth diode to supply power for the RTC. The voltage of the battery is 3V, the voltage of the direct current power supply II is 3.3V, when the direct current power supply II is normal, the third diode is conducted, the direct current power supply II supplies power to the RTC, meanwhile, the voltage of an emitting electrode of the fifth diode is smaller than the voltage of a base electrode, the emitting electrode and a collector electrode of the fifth diode are disconnected, and the battery does not work; when the direct current power supply II is powered off, the seventeenth diode is cut off, the voltage of the emitter of the fifth diode is greater than the voltage of the base, the emitter and the collector of the fifth diode are conducted, and the battery supplies power to the RTC; the battery is only for RTC power supply when DC power supply two outage, can guarantee RTC's normal work, can practice thrift battery power again, is favorable to the extension the utility model discloses a life.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic circuit block diagram of the present invention;
FIG. 2 is a schematic circuit diagram of a metering chip of the present invention;
FIG. 3 is a schematic diagram of a current sampling circuit according to the present invention;
FIG. 4 is a schematic diagram of a medium voltage sampling circuit according to the present invention;
FIG. 5 is a schematic diagram of a middle pulse output circuit according to the present invention;
FIG. 6 is a schematic diagram of a main control circuit of the present invention;
fig. 7 is a schematic diagram of a GPRS communication circuit according to the present invention;
fig. 8 is a schematic diagram of an RS485 communication circuit in the present invention;
FIG. 9 is a schematic diagram of a RTC power supply circuit of the present invention;
in the figure: 1-metering chip, 2-current sampling circuit, 21-A phase current sampling circuit, 211-current transformer, 212-conditioning circuit, 22-B phase current sampling circuit, 23-C phase current sampling circuit, 24-neutral line current sampling circuit, 3-voltage sampling circuit, 31-A phase voltage sampling circuit, 311-positive end sampling circuit, 312-negative end sampling circuit, 32-B phase voltage sampling circuit, 33-C phase voltage sampling circuit, 4-pulse output circuit, 41-optical coupler I, 5-main control circuit, 51-main control chip, 52-RTC power supply circuit, 6-GPRS communication circuit, 61-GPRS interface chip, 62-e-SIM card, 63-GPRS power supply circuit, 631-first switch tube, 632-a third switching tube, 633-a second diode, 634-an eighteenth diode, 7-an RS485 communication circuit, 71-a receiving channel, 72-a transmitting channel, 73-a differential channel and 74-an isolated power supply circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1-9, comprises
The measurement chip 1 is provided with a plurality of measurement chips,
the current sampling circuit 2 is four identical circuits, namely an A-phase current sampling circuit 21, a B-phase current sampling circuit 22, a C-phase current sampling circuit 23 and a neutral current sampling circuit 24, the A-phase current sampling circuit 21 comprises a current transformer 211 and a conditioning circuit 212, the conditioning circuit 212 comprises a fifty-fifth resistor and a fifty-sixth resistor, one end of the fifty-fifth resistor and one end of the fifty-sixth resistor are both connected with GND, one end of the fifty-fifth resistor, which is far away from the GND, is connected with a first pin of the current transformer 211, one end of the fifty-sixth resistor, which is far away from the GND, is connected with a second pin of the current transformer 211,
the first pin of the current transformer 211 is further connected with one end of a twenty-second resistor, the other end of the twenty-second resistor is connected with the metering chip 1, the second pin of the current transformer 211 is further connected with one end of a thirtieth resistor, the other end of the thirtieth resistor is connected with the metering chip 1,
the voltage sampling circuit 3 is three paths of the same voltage sampling circuit 3, which are respectively an A-phase voltage sampling circuit 31, a B-phase voltage sampling circuit 32 and a C-phase voltage sampling circuit 33, the A-phase voltage sampling circuit comprises a positive end sampling circuit 311 and a negative end sampling circuit 312, the positive end sampling circuit 311 comprises a sixty eight resistor, a sixty nine resistor, a seventy one resistor, a seventy two resistor, a seventy three resistor and a fourth resistor which are sequentially connected between an A-phase line and a GND, one end of the fourth resistor, which is far away from the GND, is connected with the metering chip 1,
the negative end sampling circuit 312 includes a forty-second resistor, one end of the forty-second resistor is connected to GND, and the other end of the forty-second resistor is connected to the metering chip 1.
The utility model discloses well electric current sampling circuit 2 includes four the same sampling passageways, samples the electric current of A looks, B looks, C looks and central line respectively, and voltage sampling circuit 3 includes the same three passageway, samples the voltage of circuit A looks, B looks and C looks respectively, and voltage and electric current sampling signal send into respectively and measure chip 1 and carry out the calculation of electric energy. The utility model discloses measured electric energy value and ammeter measured electric energy value are than, if the difference is too big, then can judge the ammeter trouble, should in time carry out the ammeter change, avoid the ammeter trouble to cause inaccurate to transmission line's monitoring data.
The utility model discloses well current transformer 211 includes two pins, wherein the electric current of first pin output is through fifty-fifth resistance, the electric current of second pin is through fifty-sixth resistance, because of the one end of fifty-fifth resistance and the one end of fifty-sixth resistance all are connected with GND, voltage IAP at fifty-fifth resistance both ends and the voltage IAN at fifty-sixth resistance both ends are the voltage signal that the size equals, opposite direction, IAP and IAN send into the pin that measurement chip 1 corresponds as differential input, such design is favorable to improving the accuracy of measurement chip 1 calculation result.
Similarly, the voltage UAP at the two ends of the fourth resistor and the voltage UAN at the two ends of the forty-second resistor in the voltage sampling circuit 3 are equal voltage signals with opposite directions, and the two paths of differential signals are respectively sent to the corresponding pins of the metering chip 1, which is beneficial to improving the accuracy of the calculation result of the metering chip 1.
The utility model discloses an accurate measurement of electric energy, simple structure, fault rate are low moreover, can realize the effective monitoring to ammeter measured data to transmission line data monitoring's accuracy has been improved.
Furthermore, one end of the twenty-second resistor, which is far away from the current transformer 211, and one end of the thirty-third resistor, which is far away from the current transformer 211, are both connected with GND through the filter capacitor.
The utility model discloses well twenty two resistance keep away from current transformer 211 one end, thirty resistance keep away from current transformer 211 one end all through filter capacitance and GND be connected, are favorable to the high frequency interference of circuit between filtering current sampling circuit 2 and the metering chip 1, further ensure the accuracy of metering chip 1 computational result.
Furthermore, one end of the fourth resistor, which is far away from the GND, and one end of the forty-second resistor, which is far away from the GND, are connected with the GND through the filter capacitor.
The utility model discloses the one end that well fourth resistance kept away from GND, the one end that GND was kept away from to the fortieth second resistance all is connected with GND through filter capacitance, is favorable to the high-frequency interference of circuit between filtering voltage sampling circuit 3 and the metering chip 1, further ensures the accuracy of metering chip 1 computational result.
Further, the LED lamp pulse output circuit comprises a pulse output circuit 4, wherein the pulse output circuit 4 comprises a first optical coupler 41, the input end of the first optical coupler 41 is connected with the metering chip 1, and the output end of the first optical coupler 41 is used for driving the LED lamp.
The utility model discloses well metering chip 1's calculation result can be through pulse signal's form output, and this pulse signal passes through an optical coupler 41 external LED lamp of drive, makes the LED lamp scintillation, and the flicker frequency who consequently observes the LED lamp just can audio-visual understanding electric energy value, and then is convenient for judge the behavior of ammeter. The optical coupler realizes the electrical isolation between the metering chip 1 and an external circuit, and is beneficial to ensuring the accuracy of the calculation result of the metering chip 1.
Further, the metering device further comprises a main control circuit 5 and a GPRS communication circuit 6, the metering chip 1 is connected with the main control circuit 5, the GPRS communication circuit 6 comprises a GPRS interface chip 61 and an e-SIM card 62 which are sequentially connected, and the GPRS interface chip 61 is further connected with the main control circuit 5.
The utility model discloses well metering chip 1 sends the measurement result to master control circuit 5, and master control circuit 5 sends the measurement result to the host computer through GPRS communication circuit 6, and the host computer can save data, is convenient for monitor the measured data in a period to there is a clear complete understanding to transmission line's operational aspect.
Further, the GPRS power supply circuit 63 is further included, the GPRS power supply circuit 63 includes a first switch tube 631, a third switch tube 632, a second diode 633 and an eighteenth diode 634, a base of the first switch tube 631 is connected to the main control circuit 5, a collector of the first switch tube 631 is connected to a gate of the third switch tube 632, a drain of the third switch tube 632 is connected to the first dc power supply, a source of the third switch tube 632 is connected to an anode of the second diode 633, a cathode of the second diode 633 is connected to an anode of the eighteenth diode 634, and a cathode of the eighteenth diode 634 is connected to a power pin of the GPRS interface chip 61.
The utility model discloses in when needing to start GPRS interface chip 61's power, main control circuit 5 sends high level signal, and the projecting pole and the collecting electrode of first switch tube 631 switch on, and the grid of third switch tube 632 is the low level, and the drain electrode and the source electrode of third switch tube 632 switch on, and DC power supply is after stepping down through second diode 633 and eighteenth diode 634, provides the power for GPRS interface chip 61.
Further, the RS485 communication circuit 7 is further included, the RS485 communication circuit 7 includes a receiving channel 71, a sending channel 72, a differential channel 73 and an isolation power circuit 74, the receiving channel 71 and the sending channel 72 are both connected with the main control circuit 5, the receiving channel 71 includes a second optical coupler, the sending channel 72 includes a third optical coupler, the differential channel 73 is connected with the isolation power circuit 74, and the differential channel 73 is used for being connected with an external circuit.
Through RS485 communication circuit 7, can be with a plurality of the utility model discloses monitor terminal cascades, is convenient for a plurality of the utility model discloses monitor terminal carries out centralized monitoring. Receiving channel 71 includes optical coupler two, sending channel 72 includes optical coupler three, and difference passageway 73 is connected with the isolation power supply, and such design has realized the utility model discloses monitor terminal avoids the influence of external interference signal with external circuit's electrical isolation the utility model discloses a work.
Further, the main control circuit 5 includes a main control chip 51 and an RTC power supply circuit 52, the RTC power supply circuit 52 includes a fifth switching tube, a seventeenth diode and a third diode, a base of the fifth switching tube is connected with an anode of the seventeenth diode, a cathode of the seventeenth diode is connected with a second direct current power supply, the second direct current power supply is further connected with an anode of the third diode, a cathode of the third diode is connected with the main control chip 51,
the collector of the fifth switching tube is connected with the main control chip 51, and the emitter of the fifth switching tube is connected with the anode of the battery.
The main control chip 51 is internally provided with an RTC, so that accurate real-time clock information is provided for the whole system, and in order to ensure that the RTC can still work normally when the power is off, the positive electrode of the battery is accessed to a pin corresponding to the main control chip 51 through a fifth diode to supply power for the RTC. The voltage of the battery is 3V, the voltage of the direct current power supply II is 3.3V, when the direct current power supply II is normal, the third diode is conducted, the direct current power supply II supplies power to the RTC, meanwhile, the voltage of an emitting electrode of the fifth diode is smaller than the voltage of a base electrode, the emitting electrode and a collector electrode of the fifth diode are disconnected, and the battery does not work; when the direct current power supply II is powered off, the seventeenth diode is cut off, the voltage of the emitter of the fifth diode is greater than the voltage of the base, the emitter and the collector of the fifth diode are conducted, and the battery supplies power to the RTC; the battery is only for RTC power supply when DC power supply two outage, can guarantee RTC's normal work, can practice thrift battery power again, is favorable to the extension the utility model discloses a life.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a transmission line loss monitor terminal which characterized in that: comprises that
A metering chip (1),
the current sampling circuits (2) are four identical circuits, namely an A-phase current sampling circuit (21), a B-phase current sampling circuit (22), a C-phase current sampling circuit (23) and a neutral current sampling circuit (24), wherein the A-phase current sampling circuit (21) comprises a current transformer (211) and a conditioning circuit (212), the conditioning circuit (212) comprises a fifty-fifth resistor and a fifty-sixth resistor, one end of the fifty-fifth resistor and one end of the fifty-sixth resistor are both connected with GND, one end of the fifty-fifth resistor, which is far away from the GND, is connected with a first pin of the current transformer (211), and one end of the fifty-sixth resistor, which is far away from the GND, is connected with a second pin of the current transformer (211),
the first pin of the current transformer (211) is also connected with one end of a twenty-second resistor, the other end of the twenty-second resistor is connected with the metering chip (1), the second pin of the current transformer (211) is also connected with one end of a thirty-third resistor, the other end of the thirty-third resistor is connected with the metering chip (1),
the voltage sampling circuit (3) is three paths which are the same and respectively an A phase voltage sampling circuit (31), a B phase voltage sampling circuit (32) and a C phase voltage sampling circuit (33), the A phase voltage sampling circuit comprises a positive end sampling circuit (311) and a negative end sampling circuit (312), the positive end sampling circuit (311) comprises a sixty eight resistor, a sixty nine resistor, a seventy one resistor, a seventy two resistor, a seventy three resistor and a fourth resistor which are sequentially connected between an A phase line and a GND, one end of the fourth resistor far away from the GND is connected with the metering chip (1),
the negative end sampling circuit (312) comprises a forty-second resistor, one end of the forty-second resistor is connected with GND, and the other end of the forty-second resistor is connected with the metering chip (1).
2. The transmission line loss monitoring terminal of claim 1, wherein: one end of the twenty-second resistor, which is far away from the current transformer (211), and one end of the thirty-third resistor, which is far away from the current transformer (211), are connected with GND through filter capacitors.
3. The transmission line loss monitoring terminal of claim 1, wherein: and one end of the fourth resistor, which is far away from the GND, and one end of the forty-second resistor, which is far away from the GND, are connected with the GND through a filter capacitor.
4. The transmission line loss monitoring terminal of claim 1, wherein: the LED lamp is characterized by further comprising a pulse output circuit (4), wherein the pulse output circuit (4) comprises a first optical coupler (41), the input end of the first optical coupler (41) is connected with the metering chip (1), and the output end of the first optical coupler (41) is used for driving the LED lamp.
5. The transmission line loss monitoring terminal of claim 1, wherein: still include master control circuit (5) and GPRS communication circuit (6), measurement chip (1) with master control circuit (5) are connected, GPRS communication circuit (6) are including GPRS interface chip (61) and e-SIM card (62) that connect gradually, GPRS interface chip (61) still with master control circuit (5) are connected.
6. The transmission line loss monitoring terminal of claim 5, wherein: the GPRS power supply circuit (63) is further included, the GPRS power supply circuit (63) comprises a first switch tube (631), a third switch tube (632), a second diode (633) and an eighteenth diode (634), the base of the first switch tube (631) is connected with the main control circuit (5), the collector of the first switch tube (631) is connected with the gate of the third switch tube (632), the drain of the third switch tube (632) is connected with a first direct-current power supply, the source of the third switch tube (632) is connected with the anode of the second diode (633), the cathode of the second diode (633) is connected with the anode of the eighteenth diode (634), and the cathode of the eighteenth diode (634) is connected with a power supply pin of the GPRS interface chip (61).
7. The transmission line loss monitoring terminal of claim 5, wherein: still include RS485 communication circuit (7), RS485 communication circuit (7) are including receiving channel (71), transmitting channel (72), difference passageway (73) and isolation power supply circuit (74), receiving channel (71) with transmitting channel (72) all with master control circuit (5) are connected, receiving channel (71) include optical coupler two, transmitting channel (72) include optical coupler three, difference passageway (73) with isolation power supply circuit (74) are connected, difference passageway (73) are used for being connected with external circuit.
8. The transmission line loss monitoring terminal of claim 5, wherein: the master control circuit (5) comprises a master control chip (51) and an RTC power supply circuit (52), the RTC power supply circuit (52) comprises a fifth switch tube, a seventeenth diode and a third diode, the base electrode of the fifth switch tube is connected with the anode of the seventeenth diode, the cathode of the seventeenth diode is connected with a second direct current power supply, the second direct current power supply is also connected with the anode of the third diode, the cathode of the third diode is connected with the master control chip (51),
and the collector of the fifth switching tube is connected with the main control chip (51), and the emitter of the fifth switching tube is connected with the anode of the battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921273478.6U CN211426628U (en) | 2019-08-07 | 2019-08-07 | Transmission line loss monitoring terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921273478.6U CN211426628U (en) | 2019-08-07 | 2019-08-07 | Transmission line loss monitoring terminal |
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| Publication Number | Publication Date |
|---|---|
| CN211426628U true CN211426628U (en) | 2020-09-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921273478.6U Active CN211426628U (en) | 2019-08-07 | 2019-08-07 | Transmission line loss monitoring terminal |
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| CN (1) | CN211426628U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730974A (en) * | 2020-12-28 | 2021-04-30 | 无锡尼尔维斯电气系统有限公司 | Multi-loop electric energy monitoring system and collection box provided with same |
-
2019
- 2019-08-07 CN CN201921273478.6U patent/CN211426628U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112730974A (en) * | 2020-12-28 | 2021-04-30 | 无锡尼尔维斯电气系统有限公司 | Multi-loop electric energy monitoring system and collection box provided with same |
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