CN209928009U - Online error detection device for voltage transformer - Google Patents
Online error detection device for voltage transformer Download PDFInfo
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- CN209928009U CN209928009U CN201920518410.3U CN201920518410U CN209928009U CN 209928009 U CN209928009 U CN 209928009U CN 201920518410 U CN201920518410 U CN 201920518410U CN 209928009 U CN209928009 U CN 209928009U
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Abstract
The utility model relates to a voltage transformer error detection technical field, a voltage transformer error on-line measuring device, it includes secondary voltage signal conversion equipment and error check gauge, secondary voltage signal conversion equipment's input inserts a set of electromagnetic type voltage transformer and at least a set of capacitive voltage transformer that is surveyed as standard voltage transformer respectively, electromagnetic type voltage transformer and every capacitive voltage transformer's of group input respectively insert the transformer be qualified for the next round of competitions on the three-phase bus, secondary voltage signal conversion equipment is including overcurrent/short-circuit protection circuit, voltage isolation circuit and turn into low voltage signal's voltage signal conversion switching box etc. with high-pressure signal. The utility model has the advantages of reasonable and compact structure, convenient to use, it not only makes the testing process simplify greatly, has still avoided the wrong wiring operation. Voltage signal conversion switches case and error check gauge and all possesses the volume less, the advantage of conveniently carrying realizes simultaneously on-line test multiunit voltage transformer, labour saving and time saving.
Description
Technical Field
The utility model relates to a voltage transformer error detection technical field is a voltage transformer error on-line measuring device.
Background
The Capacitor Voltage Transformer (CVT) is widely applied to an electric power system, and the metering accuracy, stability and operation reliability of the CVT directly influence the fairness of electric energy metering and the operation safety of a power grid. Because of its structural features, the CVT is susceptible to many aspects of operational performance and reliability.
Compared with an electromagnetic Voltage Transformer (VT), the Capacitor Voltage Transformer (CVT) has high relative insulation level and strong capability of withstanding lightning surge overvoltage, the manufacturing cost is relatively lower when the voltage level is higher, but the error characteristic of the CVT is far less stable than that of the PT due to the structural characteristics. According to the provisions of the standard JJG-1021: the VT certification cycle must not exceed 10 years and the CVT certification cycle must not exceed 4 years.
The prior art can only carry out equipment traditional test calibration under the outage condition, except that the error characteristic detection is carried out in the handover test of newly-built stations, most mutual inductors can not carry out periodic detection according to JJG-1021, and the main reasons that the periodic detection is difficult to carry out are as follows:
(1) the transformer substation has power failure difficulty, and even if the power failure maintenance plan is mainly based on the test contents of the insulation performance, the mechanical performance, the sealing performance and the like of equipment, the error characteristic of the voltage transformer is difficult to detect and schedule;
(2) with the improvement of the voltage grade, the volume and the weight of equipment for the field test of the error characteristic of the voltage transformer are increased, the field working difficulty (especially the safety risk introduced in remote mountain areas and high-altitude areas), the labor intensity, the implementation cost and the like are greatly improved;
(3) the scale of the power grid is enlarged, personnel are limited to compile, the working strength of operation and maintenance personnel is continuously increased, and the working mode of the traditional voltage transformer error characteristic test is difficult to implement.
Disclosure of Invention
The utility model provides a voltage transformer error on-line measuring device has overcome above-mentioned prior art not enough, and it can effectively solve current error characteristic to voltage transformer and detect and can only detect a voltage transformer at the transformer substation power failure maintenance state, the problem that wastes time and energy, work efficiency is low of existence.
The technical scheme of the utility model is realized through following measure: the input end of the secondary voltage signal conversion device is respectively connected with a group of electromagnetic voltage transformers serving as standard voltage transformers and at least one group of measured capacitive voltage transformers, the input end of the electromagnetic voltage transformers and the input end of each group of capacitive voltage transformers are respectively connected onto a three-phase bus of a transformer outgoing line, the secondary voltage signal conversion device comprises an overcurrent/short circuit protection circuit, a voltage isolation circuit and a voltage signal conversion switching box for converting high-voltage signals into low-voltage signals, the voltage signal conversion switching box comprises a first box body, a three-phase voltage signal input port, a voltage signal output port and a control port, the three-phase voltage signal input port, the voltage signal output port and the control port are positioned on a rear panel of the first box body, and the error calibrator comprises a second box body, a power switch, a voltage signal output port and a control port, the power switch is positioned on a front panel, The secondary voltage signal access port and the control port are positioned on the rear panel of the second box body;
the electromagnetic voltage transformer and each capacitor voltage transformer are connected with an overcurrent/short-circuit protection circuit, the output ends of each phase of the electromagnetic voltage transformer and each capacitor voltage transformer are respectively connected with a single-phase signal input interface corresponding to the voltage signal conversion switching box through a voltage isolation circuit, the voltage signal output port of the voltage signal conversion switching box is respectively connected with a corresponding secondary voltage signal input port of the error checking instrument, and the control port of the voltage signal conversion switching box is connected with the control port of the error checking instrument.
The following are further optimization or/and improvement of the technical scheme of the utility model:
the overcurrent/short-circuit protection circuit comprises a first capacitor and a second capacitor, wherein the first capacitor and the second capacitor are connected in series, the input end of the electromagnetic voltage transformer is connected in parallel at two ends of the second capacitor of the overcurrent/short-circuit protection circuit connected with the electromagnetic voltage transformer, and the input end of the capacitive voltage transformer is connected in parallel at two ends of the second capacitor of the overcurrent/short-circuit protection circuit connected with the capacitive voltage transformer.
The voltage isolation circuit comprises an A-phase air switch, a B-phase air switch and a C-phase air switch, wherein an A-phase output end of the electromagnetic voltage transformer and an A-phase output end of the capacitor voltage transformer are connected with the A-phase air switch respectively, a B-phase output end of the electromagnetic voltage transformer and a B-phase output end of the capacitor voltage transformer are connected with the B-phase air switch respectively, a C-phase output end of the electromagnetic voltage transformer and a C-phase output end of the capacitor voltage transformer are connected with the C-phase air switch respectively, and the other ends of the A-phase air switch, the B-phase air switch and the C-phase air switch are connected with voltage signal input ports of corresponding phases of the voltage signal conversion switching box respectively.
The voltage signal input interface on the rear panel of the first box body comprises at least two A-phase input interfaces, an A-phase zero line input interface, a B-phase zero line input interface, a C-phase input interface and a C-phase zero line input interface, and each of the A-phase input interface, the B-phase input interface and the C-phase input interface is respectively connected with the output ends of the corresponding A-phase air switch, the B-phase air switch and the C-phase air switch.
The error calibrator further comprises a display screen and a USB interface, wherein the display screen and the USB interface are located on the front panel of the second box body, the display screen is connected with the corresponding output interface of the error calibrator and used for displaying error data of the capacitive voltage transformers to be tested, and the USB interface is used for interface expansion.
The utility model has the advantages of reasonable and compact structure, high durability and convenient use, it is used for the on-the-spot on-line inspection of capacitive voltage transformer error, apply an equal primary quantity value with the electromagnetic type capacitive transformer of standard through giving the multiunit capacitive voltage transformer that is tested simultaneously, and realize the switching through voltage signal conversion switch box, the error check gauge realizes the electromagnetic type voltage transformer of standard respectively with the comparison of every group by the secondary output volume of capacitive voltage transformer tested, obtain an error quantity value, can read out this quantity value through the display screen of error check gauge, not only make testing process simplify greatly, the miswiring operation has still been avoided. The utility model discloses a voltage signal conversion switches case and error check gauge all possess the volume less, the advantage of conveniently carrying realizes the online test multiunit voltage transformer simultaneously, labour saving and time saving.
Drawings
Fig. 1 is a block diagram of the present invention.
Figure 2 is the utility model discloses a secondary voltage signal conversion equipment and error check meter wiring schematic diagram.
Fig. 3 is the utility model discloses a voltage signal conversion switches structure schematic diagram of case's first box rear panel.
Fig. 4 is the structure diagram of the second box front panel of the error checking instrument of the present invention.
Fig. 5 is the structure diagram of the second box rear panel of the error checking instrument of the present invention.
The codes in the figures are respectively: 1 is a display screen, UNFor secondary voltage signals of electromagnetic voltage transformers, UXIn order to detect the secondary voltage signal of the capacitor voltage transformer, Un is the converted secondary voltage signal of the electromagnetic voltage transformer, Ux is the converted secondary voltage signal of the detected capacitor voltage transformer, C1 is the first capacitor, C2 is the second capacitor,SAis an A-phase air switch, SBIs a B-phase air switch, SCThe air switch is a C-phase air switch, VT is an electromagnetic voltage transformer, CVT is a capacitor voltage transformer, A1a is an A-phase outgoing line of the electromagnetic voltage transformer, A2a is an A-phase outgoing line of the capacitor voltage transformer, A1n is an A-phase zero line of the electromagnetic voltage transformer, A2n is an A-phase zero line of the capacitor voltage transformer, B1a is a B-phase outgoing line of the electromagnetic voltage transformer, B2a is a B-phase outgoing line of the capacitor voltage transformer, B1n is a B-phase zero line of the electromagnetic voltage transformer, B2n is a B-phase zero line of the capacitor voltage transformer, C1a is a C-phase outgoing line of the electromagnetic voltage transformer, C2a is a C-phase outgoing line of the capacitor voltage transformer, C1n is a C-phase zero line of the electromagnetic voltage transformer, and C2n is a C-phase zero line of the capacitor voltage transformer.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.
In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout mode of the attached drawing 1 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.
The invention will be further described with reference to the following examples and drawings:
as shown in fig. 1, 2, 3, 4, 5, the voltage transformer error on-line detection device comprises a secondary voltage signal conversion device and an error check meter, wherein the input end of the secondary voltage signal conversion device is respectively connected with a group of electromagnetic voltage transformers VT serving as standard voltage transformers and at least a group of tested capacitive voltage transformers CVT, the input end of the electromagnetic voltage transformers VT and the input end of each group of capacitive voltage transformers CVT are respectively connected to a three-phase bus of a transformer outgoing line, the secondary voltage signal conversion device comprises an overcurrent/short circuit protection circuit, a voltage isolation circuit and a voltage signal conversion switching box for converting high-voltage signals into low-voltage signals, the voltage signal conversion switching box comprises a first box body, a three-phase voltage signal input port, a voltage signal output port and a control port which are positioned on a rear panel of the first box body, the error checking instrument comprises a second box body, a power switch positioned on the front panel of the second box body, a secondary voltage signal access port positioned on the rear panel of the second box body and a control port;
the electromagnetic voltage transformer VT and each capacitor voltage transformer CVT are connected with an overcurrent/short circuit protection circuit, each phase output end of the electromagnetic voltage transformer VT and each capacitor voltage transformer CVT is respectively connected with a single-phase signal input interface corresponding to the voltage signal conversion switching box through a voltage isolation circuit, a voltage signal output port of the voltage signal conversion switching box is respectively connected with a corresponding secondary voltage signal input port of the error checking instrument, and a control port of the voltage signal conversion switching box is connected with a control port of the error checking instrument.
The utility model discloses the standard electromagnetic type voltage transformer of selection should satisfy following requirement:
(1) selecting an electromagnetic voltage transformer VT as a reference transformer;
(2) the rated transformation ratio is the same as that of the capacitor voltage transformer CVT to be detected, and the accuracy level is at least the same or higher;
(3) it is desirable to have valid certification or calibration credentials during the certification or calibration period.
The utility model discloses an electromagnetic type voltage transformer secondary voltage signal UNAnd secondary voltage signal U of detected capacitor voltage transformerXThe secondary voltage signal conversion device is respectively connected, and after the processing of the overcurrent/protection circuit and the voltage isolation circuit, the voltage signal conversion switching box is connected, the voltage signal conversion switching box is mainly used for converting high-voltage signals obtained by the measurement of a detected capacitive voltage transformer into low-voltage signals, the voltage signal conversion switching box can be simultaneously connected with a standard electromagnetic transformer and a plurality of groups of detected capacitive voltage transformers, so that the secondary voltage signals Un of the electromagnetic voltage transformer converted by the electromagnetic voltage transformer and the secondary voltage signals Ux of the detected capacitive voltage transformers converted by the plurality of groups of detected capacitive voltage transformers are switched and output to an error checking instrument, and therefore the secondary voltage signals Un of the electromagnetic voltage transformer converted by the electromagnetic voltage transformer and the secondary voltage signals UxThe error checking instrument simultaneously tests the errors of a plurality of groups of capacitor voltage transformers on line, effectively improves the working efficiency, comprehensively considers the factors such as the high-voltage lead connection mode, whether the peripheral equipment is in the running state and the actual secondary load, detects the error characteristics of the capacitor voltage transformer CVT in real time, and comprehensively compares and analyzes the error characteristics of the capacitor voltage transformer CVT. The utility model discloses a voltage signal conversion switches case and error check gauge all possess the volume less, the advantage of conveniently carrying realizes the simultaneous on-line test multiunit capacitive voltage transformer, labour saving and time saving.
As shown in table 1, the utility model discloses an error check gauge is current voltage transformer error check equipment, needs to satisfy following condition:
(a) the accuracy level is not lower than level 2;
(b) phase difference measurement range: -180 ° to 180 ° or 0 ° to 360 °;
(c) the specific difference and phase difference indicating resolution is not lower than 0.001% and 0.01';
(d) the error introduced by the calibrator is less than 1/10 of the error limit of the voltage transformer to be tested.
The utility model discloses an error check gauge can have out original record according to the regulation, and the error is repaiied about: the ratio error and phase error of the 0.1-0.5 capacitor voltage transformer CVT can be reduced as shown in table 1. And judging whether the capacitor voltage transformer CVT exceeds the error limit value or not based on the reduced data.
The online error detection device for the voltage transformer can be further optimized or/and improved according to actual needs:
as shown in fig. 1 and 2, the overcurrent/short-circuit protection circuit includes a first capacitor C1 and a second capacitor C2, the first capacitor C1 and the second capacitor C2 are connected in series, an input terminal of the electromagnetic voltage transformer VT is connected in parallel to two ends of the second capacitor C2 of the overcurrent/short-circuit protection circuit connected thereto, and an input terminal of the capacitive voltage transformer VT is connected in parallel to two ends of the second capacitor C2 of the overcurrent/short-circuit protection circuit connected thereto.
As shown in the attached figures 1 and 2, the voltage isolation circuit comprises A-phase airSwitch SAB phase air switch SBAnd C phase air switch SCThe A-phase output end of the electromagnetic voltage transformer VT and the A-phase output end of the capacitor voltage transformer CVT are both connected with an A-phase air switch SAThe B-phase output end of the electromagnetic voltage transformer VT and the B-phase output end of the capacitor voltage transformer CVT are both connected with a B-phase air switch SBThe C-phase output end of the electromagnetic voltage transformer VT and the C-phase output end of the capacitor voltage transformer CVT are both connected with a C-phase air switch SCPhase A air switch SAB phase air switch SBAnd C phase air switch SCThe other end of the voltage signal conversion switching box is respectively connected with a voltage signal input port of a corresponding phase of the voltage signal conversion switching box.
As shown in fig. 1, 2, and 3, the voltage signal input interface on the rear panel of the first box includes at least two a-phase input interfaces, an a-phase zero-line input interface, a B-phase zero-line input interface, a C-phase input interface, and a C-phase zero-line input interface, and each of the a-phase input interface, the B-phase input interface, and the C-phase input interface is respectively connected to a corresponding a-phase air switch SAB phase air switch SBAnd C phase air switch SCThe output end is connected.
The utility model discloses when actual wiring, electromagnetic type voltage transformer 'S A looks be qualified for the next round of competitions A1a, capacitive voltage transformer' S A looks be qualified for the next round of competitions A2a and connect air switch S respectivelyAThe B-phase outgoing line B1a of the electromagnetic voltage transformer and the B-phase outgoing line B2a of the capacitor voltage transformer are respectively connected with an air switch SBThe C-phase outlet C1a of the electromagnetic voltage transformer and the C-phase outlet C2a of the capacitor voltage transformer are respectively connected with an air switch SC。
An A-phase zero line A1n of the electromagnetic voltage transformer and an A-phase zero line A2n of the capacitor voltage transformer are connected to an A-phase input interface on a rear panel of the first box body; a B-phase zero line B1n of the electromagnetic voltage transformer and a B-phase zero line B2n of the capacitor voltage transformer are connected to a B-phase input interface on a rear panel of the first box body; and a C-phase zero line C1n of the electromagnetic voltage transformer and a C-phase zero line C2n of the capacitor voltage transformer are connected to a C-phase input interface on the rear panel of the first box body.
As shown in fig. 1, 2 and 4, the error calibrator further includes a display screen 1 and a USB interface located on the front panel of the second box, the display screen 1 is connected to a corresponding output interface of the error calibrator and is used for displaying error data of the measured capacitive voltage transformers CVT, and the USB interface is used for interface expansion.
Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.
The utility model discloses best embodiment's use:
1. the equipment is powered on and started, and the utility model is in a detection state;
2. the capacitive voltage transformer to be detected and the standard electromagnetic voltage transformer are correctly connected according to requirements, and then the utility model is powered on;
3. enabling the collected voltage signal to be detected and the standard voltage signal to enter an error calibrator after passing through an overcurrent/short-circuit protection circuit, a voltage isolation circuit and a voltage signal conversion switching box, carrying out error comparison processing on the converted standard voltage signal and the detected voltage signal by the error calibrator, and calculating by integrating all factors by the error calibrator;
4. and calculating the calculation result according to the original data and the contract-repairing standard, archiving the calculation result, and uploading the calculation result to an acquisition terminal in a wired or wireless communication mode.
Claims (6)
1. The voltage transformer error on-line detection device is characterized by comprising a secondary voltage signal conversion device and an error check meter, wherein the input end of the secondary voltage signal conversion device is respectively connected with a group of electromagnetic voltage transformers serving as standard voltage transformers and at least one group of capacitance voltage transformers to be detected, the input end of the electromagnetic voltage transformers and the input end of each group of capacitance voltage transformers are respectively connected with a three-phase bus of a transformer outgoing line, the secondary voltage signal conversion device comprises an overcurrent/short-circuit protection circuit, a voltage isolation circuit and a voltage signal conversion switching box for converting high-voltage signals into low-voltage signals, the voltage signal conversion switching box comprises a first box body, a three-phase voltage signal input port, a voltage signal output port and a control port, the three-phase voltage signal input port, the voltage signal output port and the control port are positioned on a rear panel of the, The power switch is positioned on the front panel of the second box body, and the secondary voltage signal access port and the control port are positioned on the rear panel of the second box body;
the electromagnetic voltage transformer and each capacitor voltage transformer are connected with an overcurrent/short-circuit protection circuit, the output ends of each phase of the electromagnetic voltage transformer and each capacitor voltage transformer are respectively connected with a single-phase signal input interface corresponding to the voltage signal conversion switching box through a voltage isolation circuit, the voltage signal output port of the voltage signal conversion switching box is respectively connected with a corresponding secondary voltage signal input port of the error checking instrument, and the control port of the voltage signal conversion switching box is connected with the control port of the error checking instrument.
2. The on-line error detection device for the voltage transformer of claim 1, wherein the over-current/short-circuit protection circuit comprises a first capacitor and a second capacitor, the first capacitor and the second capacitor are connected in series, the input terminal of the electromagnetic voltage transformer is connected in parallel with two ends of the second capacitor of the over-current/short-circuit protection circuit connected with the electromagnetic voltage transformer, and the input terminal of the capacitive voltage transformer is connected in parallel with two ends of the second capacitor of the over-current/short-circuit protection circuit connected with the capacitive voltage transformer.
3. The on-line error detection device for the voltage transformer according to claim 1 or 2, wherein the voltage isolation circuit comprises an a-phase air switch, a B-phase air switch and a C-phase air switch, the a-phase output terminal of the electromagnetic voltage transformer and the a-phase output terminal of the capacitor voltage transformer are both connected with the a-phase air switch, the B-phase output terminal of the electromagnetic voltage transformer and the B-phase output terminal of the capacitor voltage transformer are both connected with the B-phase air switch, the C-phase output terminal of the electromagnetic voltage transformer and the C-phase output terminal of the capacitor voltage transformer are both connected with the C-phase air switch, and the other ends of the a-phase air switch, the B-phase air switch and the C-phase air switch are respectively connected with the voltage signal input ports of the corresponding phases of the voltage signal conversion switching box.
4. The on-line error detection device for the voltage transformer of claim 3, wherein the voltage signal input interface on the rear panel of the first box comprises at least two A-phase input interfaces, an A-phase zero line input interface, a B-phase zero line input interface, a C-phase input interface and a C-phase zero line input interface, and each of the A-phase input interface, the B-phase input interface and the C-phase input interface is respectively connected with the output ends of the corresponding A-phase air switch, the B-phase air switch and the C-phase air switch.
5. The on-line error detection device for the voltage transformers according to claim 1, 2 or 4, wherein the error calibrator further comprises a display screen and a USB interface, the display screen and the USB interface are located on a front panel of the second box body, the display screen is connected with a corresponding output interface of the error calibrator and used for displaying error data of each measured capacitive voltage transformer, and the USB interface is used for interface expansion.
6. The on-line error detection device for the voltage transformers according to claim 3, wherein the error calibrator further comprises a display screen and a USB interface which are arranged on the front panel of the second box body, the display screen is connected with the corresponding output interface of the error calibrator and is used for displaying error data of each measured capacitive voltage transformer, and the USB interface is used for interface expansion.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920518410.3U CN209928009U (en) | 2019-04-17 | 2019-04-17 | Online error detection device for voltage transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920518410.3U CN209928009U (en) | 2019-04-17 | 2019-04-17 | Online error detection device for voltage transformer |
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| CN209928009U true CN209928009U (en) | 2020-01-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117388785A (en) * | 2023-12-12 | 2024-01-12 | 武汉格蓝若智能技术股份有限公司 | Calibration method and system for voltage acquisition device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117388785A (en) * | 2023-12-12 | 2024-01-12 | 武汉格蓝若智能技术股份有限公司 | Calibration method and system for voltage acquisition device |
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