CN210109234U - Output signal simulation device and secondary on-load test system - Google Patents
Output signal simulation device and secondary on-load test system Download PDFInfo
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- CN210109234U CN210109234U CN201920704835.3U CN201920704835U CN210109234U CN 210109234 U CN210109234 U CN 210109234U CN 201920704835 U CN201920704835 U CN 201920704835U CN 210109234 U CN210109234 U CN 210109234U
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Abstract
The utility model relates to an electric power field especially relates to output signal analogue means and secondary area load test system, output signal analogue means, include: the alternating current rectification module is connected to the output end of the alternating current power supply; the direct current inversion module is connected to the output end of the alternating current rectification module; the signal output module is connected to the output end of the direct current inversion module; the power grid synchronization module is connected to the output end of the alternating current power supply and is used for acquiring frequency and phase information of the alternating current power supply; the output detection module is connected to the output end of the signal output module; and the input end of the power grid synchronization module is connected with the output end of the power grid synchronization module, the output end of the output detection module is connected with the control module of the direct current inversion module, and the output end of the control module is used for controlling the output of the direct current inversion module. The utility model discloses frequency and phase information, output according to the collection alternating current power supply that the synchronous module of electric wire netting sent set up the instruction and output detection module controls the accurate output of direct current contravariant module to the feedback data that signal output module detected.
Description
Technical Field
The utility model relates to an electric power field especially relates to output signal analogue means and secondary area load test system.
Background
In a transformer substation, a current transformer and a voltage transformer are the most critical bridges for connecting primary equipment and secondary equipment, and are the basis for monitoring, analyzing and controlling the secondary equipment. The basic wiring of a current loop system and a voltage loop system of a transformer substation is complex, and particularly, a high-voltage-class transformer substation has more connecting devices and the loops are easy to have open-circuit and short-circuit faults.
In the past test and handover procedures, after various conventional tests of a transformer substation are generally completed and secondary protection and loop inspection are completed, a starting test is directly performed on the transformer substation, so that problems frequently occur in the starting test of the transformer substation, and the main steps are as follows:
current loops, such as secondary open circuit of a current transformer, polarity error of a protection current transformer loop and the like;
voltage loops, such as a protection device not introduced into the secondary of the voltage transformer, a secondary polarity error of the voltage transformer, and the like;
primary equipment, such as phase sequence errors of the primary equipment, and the like.
Therefore, before the transformer substation is put into operation, in order to check the wiring reliability of the secondary circuit of the equipment, when the ac circuit of the total station secondary system is connected and debugged, a secondary simulation load test is preferably performed to check the correctness of the phase difference of the primary equipment, the correctness of the transformation ratio and the polarity of the transformer, the integrity of the secondary circuit of the transformer, and the like.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an output signal analogue means and secondary load test system to the analog output who realizes the signal and the analog output who passes through the signal realizes the secondary load test.
On the one hand, the utility model provides an output signal analogue means, include:
the alternating current rectification module is connected to the output end of the alternating current power supply;
the direct current inversion module is connected to the output end of the alternating current rectification module;
the signal output module is connected to the output end of the direct current inversion module;
the power grid synchronization module is connected to the output end of the alternating current power supply and is used for acquiring frequency and phase information of the alternating current power supply;
the output detection module is connected to the output end of the signal output module; and
the input end of the power grid synchronization module is connected with the output end of the power grid synchronization module, the output end of the power grid synchronization module is connected with the output end of the output detection module, the output end of the power grid synchronization module is connected with the control module of the direct current inversion module, and the output control module is used for controlling the output of the direct current inversion module according to the frequency and phase information of the collected alternating current power supply, the output setting instruction and the feedback data of the output detection module on the.
Preferably, the ac rectifying module includes: the input end of the full-bridge rectification circuit is connected with the output end of the alternating current power supply, and the output end of the full-bridge rectification circuit is connected with the direct current inversion module.
Preferably, the dc inversion module includes: and the input end of the thyristor inverter is connected with the output end of the alternating current rectification module, the output end of the thyristor inverter is connected with the signal output module, and the control end of the thyristor inverter is connected with the control module.
Preferably, the signal output module includes:
the current output module is used for outputting a large current signal after reducing voltage and increasing current of an output alternating current signal of the direct current inversion module;
and the voltage output module is used for outputting the alternating current voltage signal output by the direct current inversion module to output a high voltage signal after current reduction and voltage boosting.
Preferably, the control module includes:
the man-machine interaction interface is used for receiving an output setting instruction of a user;
the main controller is connected with the human-computer interaction interface, the power grid synchronization module and the output detection module and is used for controlling the output of the driver according to the frequency and phase information of the collected alternating current power supply, the output setting instruction and the feedback data of the output detection module on the signal output module, which are sent by the power grid synchronization module;
and the driver is used for driving and setting the output of the direct current inversion module.
Preferably, the output detection module includes:
the input end of the current output module is connected with the current output module, and the output end of the current output module is connected with the output current detection module of the control module and used for detecting the current output by the current output module;
the input end is connected with the voltage output module, and the output end is connected with the output voltage detection module of the control module and used for detecting the voltage output by the voltage output module.
Preferably, the method further comprises the following steps: the input end of the DC filter module is connected with the output end of the AC rectification module, and the output end of the DC filter module is connected with the input end of the DC inversion module.
Preferably, the dc filtering module includes: and the capacitor is connected in parallel with the output end of the alternating current rectification module.
The utility model has the advantages that:
and controlling the accurate output of the direct current inversion module according to the frequency and phase information of the collected alternating current power supply, the output setting instruction and the feedback data of the output detection module to the signal output module, which are sent by the power grid synchronization module.
On the other hand, the utility model provides a secondary area load test system, include:
the output signal simulator is connected to the primary sides of the current transformer and the voltage transformer and is used for simulating the output of current signals and voltage signals; and
and the testing device is connected to the secondary sides of the current transformer and the voltage transformer and is used for detecting the output of the current transformer and the voltage transformer and the secondary loop of the current transformer and the voltage transformer.
Preferably, the testing device adopts a relay protection device.
The utility model has the advantages that:
the output signal simulator generates stable working voltage and stable load current respectively, the stable working voltage and the stable load current are accessed from the primary side of the current sensor and the primary side of the voltage sensor, the loaded operation of the current sensor and the voltage sensor is simulated, and the testing device is utilized to realize the loaded test.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an ac rectifier module according to a first embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a dc inverter module according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a signal output module in the first embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a current output module according to a first embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a voltage output module according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an output detection module according to a first embodiment of the present invention;
fig. 8 is a schematic structural diagram of a control module according to a first embodiment of the present invention;
fig. 9 is a schematic structural diagram of a dc filter module according to a first embodiment of the present invention;
fig. 10 is a schematic circuit diagram of a dc filter module according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a second embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
Example one
The basic idea of this embodiment is that the control module forms an output control signal according to the received output setting instruction, using data provided by the grid synchronization module as a frequency and phase reference point, sends the output control signal to the dc inversion module, receives feedback data of the output detection module, and controls the magnitude of the output control signal according to the deviation between the feedback data and the output setting instruction, thereby achieving stable control output of current and voltage.
Based on the above conception, the utility model provides an output signal simulation device, as shown in fig. 1, include:
the alternating current rectification module is connected to the output end of the alternating current power supply;
the direct current inversion module is connected to the output end of the alternating current rectification module;
the signal output module is connected to the output end of the direct current inversion module;
the power grid synchronization module is connected to the output end of the alternating current power supply and is used for acquiring frequency and phase information of the alternating current power supply;
the output detection module is connected to the output end of the signal output module; and
the input end of the power grid synchronization module is connected with the output end of the power grid synchronization module, the output end of the power grid synchronization module is connected with the output end of the output detection module, the output end of the power grid synchronization module is connected with the control module of the direct current inversion module, and the output control module is used for controlling the output of the direct current inversion module according to the frequency and phase information of the collected alternating current power supply, the output setting instruction and the feedback data of the output detection module on the.
In one embodiment, an ac rectifier module includes: the input end of the full-bridge rectification circuit is connected with the output end of the alternating current power supply, and the output end of the full-bridge rectification circuit is connected with the direct current inversion module.
As shown in fig. 2, the full-bridge rectifier circuit includes a full-bridge rectifier circuit composed of diodes D1, D2, D3, D4, D5, and D6, and converts an ac signal output from an ac power source into a dc signal.
In one embodiment, the dc inversion module includes: and the input end of the thyristor inverter is connected with the output end of the alternating current rectification module, the output end of the thyristor inverter is connected with the signal output module, and the control end of the thyristor inverter is connected with the control module.
As shown in fig. 3, the thyristor inverter is composed of thyristors Q1, Q2, Q3, Q4, Q5, Q6. The direct current inversion module adopts a power electronic technology, and converts a direct current signal into an alternating current signal and an alternating voltage signal by receiving a control signal of the operation control module.
In one embodiment, as shown in fig. 4, the signal output module includes:
the current output module is used for outputting a large current signal after reducing voltage and increasing current of an output alternating current signal of the direct current inversion module;
and the voltage output module is used for outputting the alternating current voltage signal output by the direct current inversion module to output a high voltage signal after current reduction and voltage boosting.
Specifically, as shown in fig. 5, the current output module includes a transformer T1 connected to the output end of the dc inversion module, and the transformer T1 outputs a large current signal after stepping down and stepping up the output ac current signal of the dc inversion module.
Specifically, as shown in fig. 6, the voltage output module includes a transformer T2 connected to the output end of the dc inversion module, and the transformer T2 performs a current reduction and voltage boosting on the output ac voltage signal of the dc inversion module to output a high voltage signal.
In one embodiment, the grid synchronization module adopts a synchronous phase locking technology, converts an alternating current power supply into an alternating current signal through a synchronous voltage transformer, realizes acquisition of frequency and phase information of the alternating current power supply through analog-to-digital conversion, and sends data to the control module.
In one embodiment, as shown in fig. 7, the output detection module includes:
the input end of the current output module is connected with the current output module, and the output end of the current output module is connected with the output current detection module of the control module and used for detecting the current output by the current output module;
the input end is connected with the voltage output module, and the output end is connected with the output voltage detection module of the control module and used for detecting the voltage output by the voltage output module.
Specifically, the output current detection module converts the output current of the current output module into a current signal through the current sensor, acquires the amplitude and the phase of the alternating current of the current output module after analog-to-digital conversion, and sends the data to the operation control module.
Specifically, the output voltage detection module converts the output voltage of the voltage output module into a voltage signal through a voltage sensor, and after analog-to-digital conversion, the amplitude and the phase of the alternating voltage output by the voltage output module are collected, and data are sent to the operation control module.
In one embodiment, as shown in fig. 8, the control module includes:
the man-machine interaction interface is used for receiving an output setting instruction of a user;
the main controller is connected with the human-computer interaction interface, the power grid synchronization module and the output detection module and is used for controlling the output of the driver according to the frequency and phase information of the collected alternating current power supply, the output setting instruction and the feedback data of the output detection module on the signal output module, which are sent by the power grid synchronization module;
and the driver is used for driving and setting the output of the direct current inversion module.
Specifically, the human-computer interaction interface is connected with an output port of the upper computer or the server, a user inputs and outputs a setting instruction according to an output requirement through the upper computer or the server, and the human-computer interaction interface receives the output setting instruction and then sends the output setting instruction to the main controller. The main controller receives an output setting instruction output by the man-machine interaction interface, the frequency and phase information of the alternating current power supply output by the power grid synchronization module, and also receives feedback data detected by the output detection module to the signal output module. If the output setting instruction output by the man-machine interaction interface has deviation with the feedback data size detected by the output module, adjusting the output size of the driver to the output size required by the output setting instruction; if the output setting instruction output by the man-machine interaction interface is deviated from the feedback data size detected by the output module, the output size of the driver is not adjusted. And meanwhile, the main controller sets the frequency and the phase information of the alternating current power supply output by the driver to be the same as those of the power grid synchronization module according to the frequency and the phase information of the alternating current power supply output by the power grid synchronization module. The driver realizes output after receiving the output control signal of the master controller.
Through the analog output of the device, on one hand, the current and voltage signals of the analog output can be accurately controlled, on the other hand, the frequency and the phase of the output of the alternating current power supply can be synchronized, and the output is more stable.
As a preferred embodiment of the present invention, as shown in fig. 9, the apparatus further includes: the input end of the DC filter module is connected with the output end of the AC rectification module, and the output end of the DC filter module is connected with the input end of the DC inversion module.
Specifically, as shown in fig. 10, the dc filter module includes: and the capacitors C1 and C2 are connected in parallel at the output end of the alternating current rectifying module. The direct current signal output by the alternating current rectification module is stabilized through the capacitors C1 and C2, and direct current voltage fluctuation is reduced.
Example two
The basic idea of this embodiment is based on that in the existing test and handover procedures, after various conventional tests on the substation are completed and after secondary protection and circuit inspection are completed, the substation is directly subjected to a start test, which causes problems in the start test of the substation, so that before the substation is put into operation, in order to check the wiring reliability of the secondary circuit of the equipment, under the condition that the ac circuit of the secondary system of the substation is already connected and debugged, a secondary simulation on-load test is preferably performed to check the correctness of the phase difference of the primary equipment, the correctness of the transformation ratio and the polarity of the transformer, the integrity of the secondary circuit of the transformer, and the like. In this embodiment, the output signal simulation device in the first embodiment is used to simulate the output load, and the test device is used to realize the detection.
Based on the above conception, the utility model provides a secondary area load test system, as shown in FIG. 11, include:
the output signal simulator is connected to the primary sides of the current transformer and the voltage transformer and is used for simulating the output of current signals and voltage signals; and
and the testing device is connected to the secondary sides of the current transformer and the voltage transformer and is used for detecting the output of the current transformer and the voltage transformer and the secondary loop of the current transformer and the voltage transformer.
Preferably, the testing device in this embodiment employs a relay protection device. The relay protection device is an automatic measure and equipment which can timely send out a warning signal to an operation attendant or directly send out a trip command to a controlled circuit breaker to stop the development of events when a fault occurs to a power element (such as a generator, a line and the like) in a power system or the power system per se to endanger the safe operation of the power system. The relay protection device can realize the automation and remote operation of a power system and the automatic control of industrial production, such as automatic reclosing, automatic input of a standby power supply, remote control, remote measurement and the like.
In a specific actual working environment, the input end of the output signal simulator is connected with the output end of a three-phase alternating-current power supply, three-phase heavy current output by the output signal simulator is connected to the primary side of the current transformer, three-phase high voltage output by the output signal simulator is connected to the primary side of the voltage transformer, the output signal simulator outputs three-phase current values and three-phase voltage values required by a user, and the on-load running state of the transformer substation is simulated in an overhauling state.
Under the simulated on-load operation state, a worker can check the correctness of the phase difference of the primary equipment, the correctness of the transformation ratio and the polarity of the transformer, the integrity of a secondary circuit of the transformer and the like according to relevant regulations of the relay protection device, can effectively reduce the risk of incorrect actions of secondary systems such as the relay protection device and the like when the equipment is put into operation and reduce the hidden danger of power grid operation, and plays a more convenient and quicker role in checking and troubleshooting of a power station.
The output signal simulator generates stable working voltage and stable load current respectively, the stable working voltage and the stable load current are accessed from the primary side of the current sensor and the primary side of the voltage sensor, the loaded operation of the current sensor and the voltage sensor is simulated, and the testing device is utilized to realize the loaded test.
Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
1. An output signal simulation apparatus, comprising:
the alternating current rectification module is connected to the output end of the alternating current power supply;
the direct current inversion module is connected to the output end of the alternating current rectification module;
the signal output module is connected to the output end of the direct current inversion module;
the power grid synchronization module is connected to the output end of the alternating current power supply and is used for acquiring frequency and phase information of the alternating current power supply;
the output detection module is connected to the output end of the signal output module; and
the input end of the power grid synchronization module is connected with the output end of the power grid synchronization module, the output end of the power grid synchronization module is connected with the output end of the output detection module, the output end of the power grid synchronization module is connected with the control module of the direct current inversion module, and the output control module is used for controlling the output of the direct current inversion module according to the frequency and phase information of the collected alternating current power supply, the output setting instruction and the feedback data of the output detection module on the.
2. The output signal simulation apparatus of claim 1, wherein the ac rectification module comprises: the input end of the full-bridge rectification circuit is connected with the output end of the alternating current power supply, and the output end of the full-bridge rectification circuit is connected with the direct current inversion module.
3. The output signal simulation apparatus of claim 1, wherein the dc inversion module comprises: and the input end of the thyristor inverter is connected with the output end of the alternating current rectification module, the output end of the thyristor inverter is connected with the signal output module, and the control end of the thyristor inverter is connected with the control module.
4. The output signal simulation apparatus of claim 1, wherein the signal output module comprises:
the current output module is used for outputting a large current signal after reducing voltage and increasing current of an output alternating current signal of the direct current inversion module;
and the voltage output module is used for outputting the alternating current voltage signal output by the direct current inversion module to output a high voltage signal after current reduction and voltage boosting.
5. The output signal simulation apparatus of claim 1, wherein the control module comprises:
the man-machine interaction interface is used for receiving an output setting instruction of a user;
the main controller is connected with the human-computer interaction interface, the power grid synchronization module and the output detection module and is used for controlling the output of the driver according to the frequency and phase information of the collected alternating current power supply, the output setting instruction and the feedback data of the output detection module on the signal output module, which are sent by the power grid synchronization module;
and the driver is used for driving and setting the output of the direct current inversion module.
6. The output signal simulation apparatus of claim 4, wherein the output detection module comprises:
the input end of the current output module is connected with the current output module, and the output end of the current output module is connected with the output current detection module of the control module and used for detecting the current output by the current output module;
the input end is connected with the voltage output module, and the output end is connected with the output voltage detection module of the control module and used for detecting the voltage output by the voltage output module.
7. The output signal simulation apparatus according to any one of claims 1 to 6, further comprising: the input end of the DC filter module is connected with the output end of the AC rectification module, and the output end of the DC filter module is connected with the input end of the DC inversion module.
8. The output signal simulation apparatus of claim 7, wherein the DC filtering module comprises: and the capacitor is connected in parallel with the output end of the alternating current rectification module.
9. Secondary area load test system, its characterized in that includes:
the output signal simulator of any one of claims 1 to 8, connected to the primary side of a current transformer and a voltage transformer for simulating the output of current signals and voltage signals; and
and the testing device is connected to the secondary sides of the current transformer and the voltage transformer and is used for detecting the output of the current transformer and the voltage transformer and the secondary loop of the current transformer and the voltage transformer.
10. The secondary on-load testing system of claim 9, wherein the testing device employs a relay protection device.
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| CN110133404A (en) * | 2019-05-17 | 2019-08-16 | 国网浙江省电力有限公司宁波供电公司 | Output signal analog device and secondary loading tests system |
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| CN110133404A (en) * | 2019-05-17 | 2019-08-16 | 国网浙江省电力有限公司宁波供电公司 | Output signal analog device and secondary loading tests system |
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