CN203250018U - On-site calibrating device for resistor attenuator in high voltage direct current power transmission and transformation system - Google Patents
On-site calibrating device for resistor attenuator in high voltage direct current power transmission and transformation system Download PDFInfo
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- CN203250018U CN203250018U CN 201320274308 CN201320274308U CN203250018U CN 203250018 U CN203250018 U CN 203250018U CN 201320274308 CN201320274308 CN 201320274308 CN 201320274308 U CN201320274308 U CN 201320274308U CN 203250018 U CN203250018 U CN 203250018U
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Abstract
The utility model discloses a on-site calibrating device for a resistor attenuator in a high voltage direct current power transmission and transformation system. A resistor C, a resistor A1, a resistor B1 and a variable resistor D are sequentially in series connection between the voltage and the ground to form a first line; a variable resistor X, a resistor B and a resistor A are sequentially in series connection between the ground and the voltage to form a second line; the first line and the second line are in parallel connection; a switch K2 is in parallel connection between the two ends of the resistor C; a switch K1 is in parallel connection between the two ends of the resistor B; a switch K3 is in parallel connection between the two ends of the variable resistor D; a voltmeter, the resistor B and the variable resistor X are in parallel connection; and one end of a zero indication instrument is electrically connected to a node between the resistor A and the resistor B, and the other end of the zero indication instrument is electrically connected to a node between the resistor A1 and the resistor B1. The utility model has advantages of low cost, and improvement on stability, linearity and capability of a high voltage arm resistor.
Description
Technical field
The utility model relates to high voltage direct current power transmission and transformation field, particularly, relates to a kind of device for on-site calibration for high voltage direct current power transmission and transformation system resitstance voltage divider.
Background technology
The voltage measurement of high voltage direct current power transmission and transformation system and measurement, by directly being connected in the resitstance voltage divider between system line and the ground, circuit high voltage is converted to the secondary line low-voltage that directly to be measured by the low-voltage instrument, multiply by the resitstance voltage divider conversion coefficient through on-site proving and qualified (or correction), obtain one time the circuit high-voltage value.System is generally 0.2% with the accuracy of resitstance voltage divider, and on-site proving should be higher than 0.05% with the accuracy of device.Present on-site proving technology is to adopt directly comparing method, namely forms standard with high-precision high-voltage arm resistance and high-precision low-voltage arm and carries out, and is difficult to stability, the linearity and the antijamming capability of the high-voltage arm resistance of assurance standard.And directly comparing method requires high-precision standard, will have high accuracy, long-time stability and short-time stability, the linearity, antijamming capability simultaneously, and the high and effect of cost still difficulty reaches requirement.
The utility model content
The purpose of this utility model is, for the problems referred to above, proposes a kind of device for on-site calibration for high voltage direct current power transmission and transformation system resitstance voltage divider, and is low-cost lower to realize, improves the advantage of stability, the linearity and the antijamming capability of high-voltage arm resistance.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of device for on-site calibration for high voltage direct current power transmission and transformation system resitstance voltage divider, comprise resistance C, resistance A, resistance B, resistance A1, resistance B1, variable resistor D, variable resistor X, K switch 1, K switch 2, K switch 3, zero indicator and voltage table, described resistance C, resistance A1, resistance B1 and variable resistor D are connected on successively and form the first circuit between voltage and the ground, described variable resistor X, resistance B and resistance A be connected on successively and voltage between form the second circuit, described the first circuit and the second circuit are in parallel, described K switch 2 is connected in parallel on the two ends of resistance C, described K switch 1 is connected in parallel on the two ends of resistance B, described K switch 3 is connected in parallel on the two ends of variable resistor D, described voltage table is in parallel with resistance B and variable resistor X, described zero indicator one end is connected electrically on the node between resistance A and the resistance B, and its other end is connected electrically on the node between resistance A1 and the resistance B1.
Further, described resistance A is that precision is 1%, and rated voltage is the precision metallic film resistance of 500kv, and the external insulation of resistance adopts the epoxy tube of 5 * 30mm * φ 200mm.
Further, described resistance B is that precision is 0.01%, and rated voltage is the accurate wire-wound resistor of 600V, and the external insulation of resistance adopts the epoxy tube of 5 * 30mm * φ 200mm.
Further, it is 0.01% that described resistance C selects precision, and rated voltage is the precision resistance of 5KV, and the external insulation of resistance adopts the epoxy tube of 1 * 200mm * φ 200mm.
Further, described variable resistor D is 0.02% grade precision resistance case.
Further, described precision resistance case is ZX25P type resistance box.
Further, described variable resistor X is 0.01% grade precision resistance case.
Further, described precision resistance case adopts ZX54 type resistance box.
Further, described zero indicator adopts AC5a type pointer-type zero indicator.
Further, the input impedance of described voltage table is 10G Ω.
The technical solution of the utility model has following beneficial effect:
The technical solution of the utility model, by providing a kind of resitstance voltage divider firm device, by the closure between K switch 1, K switch 2 and the K switch 3, and variable-resistance adjusting, reached low-cost lower, improve the purpose of stability, the linearity and the antijamming capability of high-voltage arm resistance, and accurately the high voltage direct current power transmission and transformation system is tested.And to the accurate restriction of each resistance so that stability, the linearity and the antijamming capability of device be further enhanced.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is the described device for on-site calibration electronic circuitry for high voltage direct current power transmission and transformation system resitstance voltage divider of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the utility model, and be not used in restriction the utility model.
As shown in Figure 1, a kind of device for on-site calibration for high voltage direct current power transmission and transformation system resitstance voltage divider, comprise resistance C, resistance A, resistance B, resistance A1, resistance B1, variable resistor D, variable resistor X, K switch 1, K switch 2, K switch 3, zero indicator and voltage table, resistance C, resistance A1, resistance B1 and variable resistor D are connected on successively and form the first circuit between voltage and the ground, variable resistor X, resistance B and resistance A be connected on successively and voltage between form the second circuit, the first circuit and the second circuit are in parallel, K switch 2 is connected in parallel on the two ends of resistance C, K switch 1 is connected in parallel on the two ends of resistance B, K switch 3 is connected in parallel on the two ends of variable resistor D, voltage table is in parallel with resistance B and variable resistor X, zero indicator one end is connected electrically on the node between resistance A and the resistance B, and the other end of zero indicator is connected electrically on the node between resistance A1 and the resistance B1.
Wherein, resistance A is that precision is 1%, and rated voltage is the precision metallic film resistance of 500kv, and the external insulation of resistance adopts the epoxy tube of 5 * 30mm * φ 200mm.Resistance B is that precision is 0.01%, and rated voltage is the accurate wire-wound resistor of 600V, and the external insulation of resistance adopts the epoxy tube of 5 * 30mm * φ 200mm.It is 0.01% that resistance C selects precision, and rated voltage is the precision resistance of 5KV, and the external insulation of resistance adopts the epoxy tube of 1 * 200mm * φ 200mm.Variable resistor D is 0.02% grade precision resistance case.The precision resistance case is ZX25P type resistance box.Variable resistor X is 0.01% grade precision resistance case.The precision resistance case adopts ZX54 type resistance box.Zero indicator adopts AC5a type pointer-type zero indicator.The input impedance of voltage table is 10G Ω.
The device for on-site calibration measurement procedure that is used for high voltage direct current power transmission and transformation system resitstance voltage divider is specific as follows:
Step 1: balance for the first time: K switch 2 and K switch 3 are closed, and then resistance C and resistance D are by short circuit, and regulating resistance X makes zero indicator G nulling, and then the resistance between resistance is closed and is in the circuit: A/X=A1/B1
Step 2: balance for the second time: K switch 2 K switch 3 are opened, and regulating resistance D makes zero indicator G nulling, and then the resistance between resistance is closed and is in the circuit: A/X=(A1+C)/(B1+D)
Step 3: then by following calculating: ∵ A1/B1=(A1+C)/(B1+D), ∴ R=U1/U2=(A1+B1)/B1=(C+D)/D,
∴U1=U2（C+D）/D，R=（C+D）/D
The intrinsic standoff ratio of the tested voltage divider of ∴ (A1+B1)/B1=(C+D)/D
In the formula, R represents scale-up factor.
During actual test, K switch 1 segmentation accesses 0 Ω ~ 500k Ω, and resistance B and resistance X resistance in series step-less adjustment scope are 0 Ω ~ 611k Ω, tested intrinsic standoff ratio scope be 819～20000(consider resistance X the unsuitable figure place of reading very little, get 5, if resistance X gets 4, intrinsic standoff ratio can be larger); The representative resistance values corresponding with resistance such as the A in the step 3 in the formula, B, A1, B1, U1 and U2 are magnitude of voltage.
The selection of each components and parts in the resistance:
Resistance A selects precision metallic film resistance (1% grade, 500kV, 500M Ω, 1000 * 500k Ω * 2W series connection), and external insulation is the epoxy tube of 2 * 2m * φ 200mm;
Resistance B selects accurate wire-wound resistor (0.01% grade, 600V, 5 * RX70-100K * 0.25W series connection), and external insulation is the epoxy tube of 5 * 30mm * φ 200mm;
Resistance C selects precision resistance (0.01% grade, 5kV, 50 * RX70-100K * 0.25W series connection), and external insulation is the epoxy tube of 1 * 200mm * φ 200mm;
Resistance D selects precision resistance case (0.02% grade, the ZX25P type);
Variable resistor X selects precision resistance case (0.01% grade, the ZX54 type);
Variable resistor G selects AC5a type pointer-type zero indicator, ultimate resolution 2 * 10-9A/ lattice or 1 * 10-6V/ lattice;
Voltage table U2 selects Agilent 34411A type multimeter, input impedance 10G Ω;
K switch 1, K2 and K3 use 6mm2 * (0.5～1) m plug cord temporary short-circuit and open circuit.
The measurement influence factor of dc high voltage is as follows:
1, accuracy, stability, the linearity of resistance D and resistance X
Resistance D and resistance X are precision resistance, ripe Design and manufacture, and annual censorship, the parts accuracy has required one-level high than overall accuracy, and therefore, accuracy, stability, the linearity can guarantee to meet the demands;
2, accuracy, stability, the linearity of resistance B and resistance C
Resistance B and resistance C are that accurate wire-wound resistor welding is in series, and the accuracy that can guarantee resistance value is measured in accuracy by the high precision electric bridge;
Stability, the resistance rated power 0.25W of resistance B and resistance C, the power that uses under the rated voltage is 0.1W, satisfies the thermal stability requirement;
The linearity, resistance are 0.01 grade of resistance, exceed test specimen class of accuracy 3 ranks, resistance rated voltage 158V, and resistive voltage is 100V under the rated voltage, satisfies linearity;
3, the short-time stability of resistance A
The value that does not occur resistance A in the final computing formula, be that accuracy and the linearity are substantially without impact, the accuracy of short-time stability meeting influence process computing formula, namely the variation of A still has requirement in twice zeroing, resistance rated power 2W, the power that uses under the rated voltage is 0.5W, satisfies the thermal stability requirement.
It should be noted that at last: the above only is preferred embodiment of the present utility model, be not limited to the utility model, although with reference to previous embodiment the utility model is had been described in detail, for a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. device for on-site calibration that is used for high voltage direct current power transmission and transformation system resitstance voltage divider, it is characterized in that, comprise resistance C, resistance A, resistance B, resistance A1, resistance B1, variable resistor D, variable resistor X, K switch 1, K switch 2, K switch 3, zero indicator and voltage table, described resistance C, resistance A1, resistance B1 and variable resistor D are connected on successively and form the first circuit between voltage and the ground, described variable resistor X, resistance B and resistance A be connected on successively and voltage between form the second circuit, described the first circuit and the second circuit are in parallel, described K switch 2 is connected in parallel on the two ends of resistance C, described K switch 1 is connected in parallel on the two ends of resistance B, described K switch 3 is connected in parallel on the two ends of variable resistor D, described voltage table is in parallel with resistance B and variable resistor X, described zero indicator one end is connected electrically on the node between resistance A and the resistance B, and its other end is connected electrically on the node between resistance A1 and the resistance B1.
2. the device for on-site calibration for high voltage direct current power transmission and transformation system resitstance voltage divider according to claim 1, it is characterized in that, described resistance A is that precision is 1%, and rated voltage is the precision metallic film resistance of 500kv, and the external insulation of resistance adopts the epoxy tube of 5 * 30mm * φ 200mm.
3. the device for on-site calibration for high voltage direct current power transmission and transformation system resitstance voltage divider according to claim 1, it is characterized in that, described resistance B is that precision is 0.01%, and rated voltage is the accurate wire-wound resistor of 600V, and the external insulation of resistance adopts the epoxy tube of 5 * 30mm * φ 200mm.
4. the device for on-site calibration for high voltage direct current power transmission and transformation system resitstance voltage divider according to claim 1, it is characterized in that, it is 0.01% that described resistance C selects precision, and rated voltage is the precision resistance of 5KV, and the external insulation of resistance adopts the epoxy tube of 1 * 200mm * φ 200mm.
5. the device for on-site calibration for high voltage direct current power transmission and transformation system resitstance voltage divider according to claim 1 is characterized in that, described variable resistor D is 0.02% grade precision resistance case.
6. the device for on-site calibration for high voltage direct current power transmission and transformation system resitstance voltage divider according to claim 5 is characterized in that, described precision resistance case is ZX25P type resistance box.
7. the device for on-site calibration for high voltage direct current power transmission and transformation system resitstance voltage divider according to claim 1 is characterized in that, described variable resistor X is 0.01% grade precision resistance case.
8. the device for on-site calibration for high voltage direct current power transmission and transformation system resitstance voltage divider according to claim 7 is characterized in that, described precision resistance case adopts ZX54 type resistance box.
9. the device for on-site calibration for high voltage direct current power transmission and transformation system resitstance voltage divider according to claim 1 is characterized in that, described zero indicator adopts AC5a type pointer-type zero indicator.
10. the device for on-site calibration for high voltage direct current power transmission and transformation system resitstance voltage divider according to claim 1 is characterized in that, the input impedance of described voltage table is 10G Ω.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320274308 CN203250018U (en) | 2013-05-20 | 2013-05-20 | On-site calibrating device for resistor attenuator in high voltage direct current power transmission and transformation system |
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| CN 201320274308 CN203250018U (en) | 2013-05-20 | 2013-05-20 | On-site calibrating device for resistor attenuator in high voltage direct current power transmission and transformation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308878A (en) * | 2013-05-20 | 2013-09-18 | 国家电网公司 | On-site detection device for resistor divider in high-voltage direct current power transmission and transformation system |
| CN104062624A (en) * | 2014-07-11 | 2014-09-24 | 国家电网公司 | Direct-current high-voltage voltage divider calibrating method based on standard arm insertion method |
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2013
- 2013-05-20 CN CN 201320274308 patent/CN203250018U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308878A (en) * | 2013-05-20 | 2013-09-18 | 国家电网公司 | On-site detection device for resistor divider in high-voltage direct current power transmission and transformation system |
| CN104062624A (en) * | 2014-07-11 | 2014-09-24 | 国家电网公司 | Direct-current high-voltage voltage divider calibrating method based on standard arm insertion method |
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Granted publication date: 20131023 Termination date: 20190520 |