CN202533485U - CVT secondary side voltage collection circuit used for CVT monitoring apparatus - Google Patents
CVT secondary side voltage collection circuit used for CVT monitoring apparatus Download PDFInfo
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- CN202533485U CN202533485U CN2012201121866U CN201220112186U CN202533485U CN 202533485 U CN202533485 U CN 202533485U CN 2012201121866 U CN2012201121866 U CN 2012201121866U CN 201220112186 U CN201220112186 U CN 201220112186U CN 202533485 U CN202533485 U CN 202533485U
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Abstract
The utility model discloses a CVT secondary side voltage collection circuit used for a CVT monitoring apparatus, comprising a resistor R12, a gas discharging tube D4, an isolation transformer, a resistor R13, a gas discharging tube D5 and an instrument amplifier, wherein one end of the primary side of the isolation transformer is connected with the resistor R12, both ends of the secondary side are respectively connected with two input ends of the instrument amplifier, the gas discharging tube D4 is connected with both ends of the primary side of the isolating transformer, the resistor R13 is connected with both ends of the secondary side of the isolation transformer, the gas discharging tube D5 and the resistor R13 are connected in parallel, the non-inverting input end of the instrument amplifier is grounded through a resistor R10, the resistor R10 is connected with a capacitor C5 in parallel, the inverting input end of the instrument amplifier is grounded through a resistor R16, and the resistor R16 is connected with a capacitor C8 in parallel. The CVT secondary side voltage collection circuit used for a CVT monitoring apparatus isolates a ground end in a measuring system from a ground end at the secondary side of a CVT, thereby reducing clutter wave and interference and simultaneously playing an effect of circuit protection when a collected voltage is overhigh in level, or is overlarge in fluctuation.
Description
Technical field
The utility model relates to a kind of Acquisition Circuit, relates in particular to the CVT secondary side voltage collection circuit that is used for a kind of CVT monitoring device.
Background technology
Traditional Zinc-Oxide Arrester detection system is introduced required voltage signal and current signal in the same equipment; Voltage signal is that the secondary side of the capacitance type potential transformer (CVT) from transformer station takes out; Current signal can take out through current transformer from the ground wire of Zinc-Oxide Arrester (MOA), and perhaps the lightning stroke counter through the Zinc-Oxide Arrester lower end records.Therefore, the applicant in submitting on the same day of the application " a kind of CVT monitoring device that is used to monitor MOA voltage " patented claim by name, as shown in Figure 1.But when gathering voltage signal since can not be well with separate with the ground of CVT secondary side intrasystemly, produce clutter and interference, make that the precision of gathering is not enough.And overtension or fluctuation are bigger sometimes, often damage device.
Summary of the invention
The purpose of the utility model is to overcome the defective of prior art and the CVT secondary side voltage collection circuit that is provided for a kind of CVT monitoring device; It separates the ground of ground in the measuring system and CVT secondary side; Reduce clutter and interference; When gathering overtension or fluctuate greatly, play the effect of holding circuit simultaneously.
The technical scheme that realizes above-mentioned purpose is:
Be used for a kind of CVT secondary side voltage collection circuit of CVT monitoring device, said CVT monitoring device comprises microprocessor, and the amplifying circuit, wireless communication module and the storer that are connected respectively with this microprocessor, and the holding circuit that connects said amplifying circuit,
Said CVT secondary side voltage collection circuit comprises resistance R 12, gas-discharge tube D4, isolating transformer, resistance R 13, gas-discharge tube D5 and instrument amplifier, wherein,
The former limit one terminating resistor R12 of said isolating transformer, the secondary two ends connect two input ends of said instrument amplifier respectively;
Gas-discharge tube D4 is connected on the two ends, former limit of said isolating transformer;
Resistance R 13 is connected on the secondary two ends of said isolating transformer; Gas-discharge tube D5 is parallelly connected with resistance R 13;
The in-phase input end of said instrument amplifier is through resistance R 10 ground connection, resistance R 10 shunt capacitance C5;
The inverting input of said instrument amplifier is through resistance R 16 ground connection, resistance R 16 shunt capacitance C8;
Resistance R 12 is converted into current signal with the voltage signal of CVT secondary side, and resistance R 13 will convert voltage signal into through this current signal of said isolating transformer and import said instrument amplifier, and the output terminal of this instrument amplifier connects said holding circuit.
The above-mentioned CVT secondary side voltage collection circuit that is used for a kind of CVT monitoring device, wherein, said isolating transformer is 1: 1 a transformer.
The above-mentioned CVT secondary side voltage collection circuit that is used for a kind of CVT monitoring device, wherein, the two ends on the former limit of said isolating transformer meet fusible link R11 and fusible link R15 respectively.
The beneficial effect of the utility model is: the utility model separates the ground of ground in the measuring system and CVT secondary side, reduces clutter and interference, when gathering overtension or fluctuate greatly, plays the effect of holding circuit simultaneously.The utility model is simple in structure, is easy to realize that advantages of high practicability is arranged.
Description of drawings
Fig. 1 is the structural representation of CVT monitoring device;
Fig. 2 is the circuit diagram of the CVT secondary side voltage collection circuit that is used for a kind of CVT monitoring device of the utility model.
Embodiment
To combine accompanying drawing that the utility model is described further below.
See also Fig. 1; Be used to monitor the CVT monitoring device of MOA voltage; It is fixedly mounted near the CVT, connects three CVT, comprises microprocessor 1; And the amplifying circuit 2, wireless communication module 3, storer 4 and the GPS module 6 that are connected respectively with this microprocessor 1, and the holding circuit 5 that connects amplifying circuit 2.
See also Fig. 2, the CVT secondary side voltage collection circuit that is used for a kind of CVT monitoring device of the utility model comprises resistance R 12, gas-discharge tube D4, isolating transformer U7, resistance R 13, gas-discharge tube D5 and instrument amplifier U6, wherein,
The former limit one terminating resistor R12 of isolating transformer U7, the secondary two ends connect two input ends of instrument amplifier U6 respectively;
The two ends on the former limit of isolating transformer U7 meet fusible link R11 and fusible link R15 respectively, prevent that big electric current from appearring in failover;
Gas-discharge tube D4 is connected on the two ends, former limit of isolating transformer U7, damages device in case big voltage fluctuation appears in the CVT secondary side;
Resistance R 13 is connected on the secondary two ends of isolating transformer U7; Gas-discharge tube D5 is parallelly connected with resistance R 13;
The in-phase input end of instrument amplifier U6 is through resistance R 10 ground connection, resistance R 10 shunt capacitance C5;
The inverting input of instrument amplifier U6 is through resistance R 16 ground connection, resistance R 16 shunt capacitance C8;
Resistance R 10 and capacitor C 5, resistance R 16 and capacitor C 8 form respectively two play the stable effect of sustaining voltage to ground circuit.
In the present embodiment, isolating transformer U7 is 1: 1 a transformer, and model is TV1013; The model that instrument amplifier U6 selects for use is AD8221, separates in order to the ground with ground in the measuring system and CVT secondary side, thereby reduces clutter and interference; Supply voltage is+5V and-5V.
Resistance R 12 is converted into current signal with the voltage signal of CVT secondary side, and resistance R 13 will convert voltage signal into through the current signal of isolating transformer U7, and then and import instrument amplifier U6, the output terminal of this instrument amplifier U6 connects holding circuit 5.R12 and R13 are respectively the resistance of resistance R 12 and resistance R 13, in the present embodiment, select R13=249 Ω for use, and R12=100k Ω selects 1% for use, the precision resister of 50ppm.
Above embodiment only supplies to explain the usefulness of the utility model; But not to the restriction of the utility model; The technician in relevant technologies field under the situation of spirit that does not break away from the utility model and scope, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to the category of the utility model, should be limited each claim.
Claims (3)
1. the CVT secondary side voltage collection circuit that is used for a kind of CVT monitoring device; Said CVT monitoring device comprises microprocessor; And the amplifying circuit, wireless communication module and the storer that are connected respectively with this microprocessor, and the holding circuit that connects said amplifying circuit
It is characterized in that said CVT secondary side voltage collection circuit comprises resistance R 12, gas-discharge tube D4, isolating transformer, resistance R 13, gas-discharge tube D5 and instrument amplifier, wherein,
The former limit one terminating resistor R12 of said isolating transformer, the secondary two ends connect two input ends of said instrument amplifier respectively;
Gas-discharge tube D4 is connected on the two ends, former limit of said isolating transformer;
Resistance R 13 is connected on the secondary two ends of said isolating transformer; Gas-discharge tube D5 is parallelly connected with resistance R 13;
The in-phase input end of said instrument amplifier is through resistance R 10 ground connection, resistance R 10 shunt capacitance C5;
The inverting input of said instrument amplifier is through resistance R 16 ground connection, resistance R 16 shunt capacitance C8;
Resistance R 12 is converted into current signal with the voltage signal of CVT secondary side, and resistance R 13 will convert voltage signal into through this current signal of said isolating transformer and import said instrument amplifier, and the output terminal of this instrument amplifier connects said holding circuit.
2. the CVT secondary side voltage collection circuit that is used for a kind of CVT monitoring device according to claim 1 is characterized in that said isolating transformer is 1: 1 a transformer.
3. the CVT secondary side voltage collection circuit that is used for a kind of CVT monitoring device according to claim 1 is characterized in that the two ends on the former limit of said isolating transformer meet fusible link R11 and fusible link R15 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201121866U CN202533485U (en) | 2012-03-22 | 2012-03-22 | CVT secondary side voltage collection circuit used for CVT monitoring apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201121866U CN202533485U (en) | 2012-03-22 | 2012-03-22 | CVT secondary side voltage collection circuit used for CVT monitoring apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN202533485U true CN202533485U (en) | 2012-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012201121866U Expired - Fee Related CN202533485U (en) | 2012-03-22 | 2012-03-22 | CVT secondary side voltage collection circuit used for CVT monitoring apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608390A (en) * | 2012-03-22 | 2012-07-25 | 上海市电力公司 | CVT (constant-voltage transformer) secondary voltage acquisition circuit for CVT monitoring device |
| CN103499730A (en) * | 2013-10-16 | 2014-01-08 | 国网山东省电力公司青岛供电公司 | Safety electricity testing and discharging device |
| CN106093688A (en) * | 2016-08-05 | 2016-11-09 | 国家电网公司 | A kind of Substation secondary circuit fault automatic detection alarm device |
-
2012
- 2012-03-22 CN CN2012201121866U patent/CN202533485U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608390A (en) * | 2012-03-22 | 2012-07-25 | 上海市电力公司 | CVT (constant-voltage transformer) secondary voltage acquisition circuit for CVT monitoring device |
| CN103499730A (en) * | 2013-10-16 | 2014-01-08 | 国网山东省电力公司青岛供电公司 | Safety electricity testing and discharging device |
| CN106093688A (en) * | 2016-08-05 | 2016-11-09 | 国家电网公司 | A kind of Substation secondary circuit fault automatic detection alarm device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20200322 |
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| CF01 | Termination of patent right due to non-payment of annual fee |