CN217766771U - Voltage loop ground point detection system - Google Patents
Voltage loop ground point detection system Download PDFInfo
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- CN217766771U CN217766771U CN202122611657.XU CN202122611657U CN217766771U CN 217766771 U CN217766771 U CN 217766771U CN 202122611657 U CN202122611657 U CN 202122611657U CN 217766771 U CN217766771 U CN 217766771U
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Abstract
The utility model discloses a voltage loop ground point detecting system belongs to electric power system detection technical field, including central processing unit, stationary flow module, signal detection module, orientation module and display module, the central processing unit storage has the reference current value and the module operation instruction that the circuit detected, and send instruction gives stationary flow module and signal detection module, stationary flow module receives the signal operation instruction that central processing unit sent, and the operation produces steady voltage, sets up steady voltage change time, acquires the constant current value according to ground resistance, produces current signal, sends the current signal who acquires for signal detection module, after the operation instruction that central processing unit sent is received to signal detection module, the current signal that receives stationary flow module and send measures ground circuit current signal, the utility model discloses a point ground connection to the transformer substation carries out on-line detection, judges voltage transformer secondary circuit voltage loop network multiple spot ground fault fast, does not influence the correct measurement of measurement and control device to voltage.
Description
Technical Field
The utility model belongs to the technical field of the power system detects, specifically speaking relates to a voltage circuit ground point detecting system.
Background
The relay protection alternating current voltage circuit in the transformer substation is one of the information sources of the protection device and is a precondition for protecting correct action, and in the anti-accident and anti-interference measures of the secondary circuit of the voltage transformer in the transformer substation of the national power grid dispatching center, it is definitely specified that the secondary circuit of the voltage transformer can only be grounded at one point in the voltage circuit in the control room, and the voltage circuit of the voltage circuit must be grounded at one point and only at one point. If the voltage loop is not grounded or is grounded at multiple points, the protection device can be mistakenly operated or refused to operate;
for a transformer substation in operation, whether a voltage loop is actually grounded at one point or not is detected by no means at present, the voltage loop is ensured only by wiring during production, a plurality of protective gaps are arranged on the voltage loop, once the gaps are broken down or the cable insulation of the voltage loop is damaged and grounded, the voltage loop is grounded at multiple points, and serious damage is caused to equipment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a voltage circuit ground point detecting system, aim at not having concrete means to detect the problem whether real a bit ground connection of voltage circuit to the transformer substation in service, do not change the voltage secondary circuit, guarantee the safe operation of transformer substation, detect voltage circuit on line.
In order to achieve the above object, the utility model provides a voltage circuit ground point detecting system, voltage circuit ground point detecting system includes:
the device comprises a central processing unit, a current stabilization module, a signal detection module, a positioning module and a display module;
the central processing unit stores a reference current value detected by the circuit and a module operation instruction, and sends the instruction to the current stabilization module and the signal detection module;
the current stabilizing module receives a signal operation instruction sent by the central processing unit, operates to generate a stable voltage, sets a stable voltage change time, acquires a constant current value according to the grounding resistor, generates a current signal, and sends the acquired current signal to the signal detection module;
the signal detection module receives a current signal sent by the current stabilization module after receiving an operation instruction sent by the central processing unit, measures a current signal of the grounding circuit, compares and judges the received current signal and the measured current signal, sends a measurement position to the positioning module, and sends a judgment result to the display module;
the positioning module receives the measured position data sent by the signal detection module and stores the data;
and the display module receives the judgment result sent by the signal detection module, sets a result display signal and displays a corresponding signal according to the received judgment result.
Preferably, the generating of the stable voltage is performed by connecting a 220V power supply in a terminal box of the voltage transformer, and converting an output power mode into ± 12DC by using a converter to generate the stable voltage.
Preferably, the current stabilization module comprises a limiting module, and the limiting module limits the generated constant current value by using a direct current clamp meter and stabilizes the current value within the range of 0.1%.
Preferably, the range of the direct current clamp meter is defined to be 0-100 mA, the minimum resolution is set to be +/-0.01 mA, and the measured current signal value is fed back to the processing module.
Preferably, the current stabilization module includes a processing module, the processing module processes a current signal generated by the obtained constant current value, processes a zero drift generated in the current signal by using a wavelet analysis method, and sends the processed current signal to the signal detection module.
Preferably, the signal detection module comprises a timing module, and the timing module is provided with a time-trigger signal, sends the trigger signal to the signal detection module within a specified time, and measures the current signal of the grounding circuit at the time point.
Preferably, the signal detection module further comprises a signal amplification module and a signal synchronization module:
the signal amplification module receives the current signal sent by the current stabilization module, amplifies the current signal and sends the amplified signal to the signal synchronization module;
the signal synchronization module receives the amplified signal sent by the signal amplification module, acquires a measured current signal of the grounding circuit, synchronizes the signal in the grounding current with the amplified signal, eliminates the current of other components in the grounding current, and retains the current signal of the square wave with the same phase and angle.
Preferably, the comparison between the received current signal and the measured current signal in the signal detection module is as follows:
the amplified current signal is consistent with the ground current signal after being eliminated, and the ground point is grounded at one point according to the judgment result;
the amplified current signal is inconsistent with the ground current signal after being eliminated, and the judgment result is that the ground point is in multipoint grounding;
the amplified current signal and the ground current signal after being eliminated are both 0, and the grounding point is 0 according to the judgment result.
Preferably, the display module is an LCD display, and the display of the corresponding signal according to the received determination result is:
the judgment result is that one point is grounded, and the indicator light on the display is correspondingly displayed in green;
the judgment result is multipoint grounding, indicator light on the display is correspondingly displayed in red, and the data of the measurement position stored by the positioning module is sent to the display screen;
and the judgment result is that the point 0 is grounded, and the indicator light on the display is correspondingly displayed in yellow.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) The utility model discloses obtained a plug-and-play's voltage circuit ground connection detection device, can carry out on-line measuring to the one point ground connection of transformer substation, judge voltage transformer secondary circuit voltage circuit network multiple spot ground fault fast;
(2) The utility model discloses real-time detection judges that voltage transformer secondary circuit voltage return circuit network is ground at a point, when not changing voltage secondary circuit structure, does not influence the protection and measurement and control device to the correct measurement of voltage;
(3) The utility model discloses simple structure, reasonable in design easily installs.
Drawings
In order to more clearly illustrate the embodiments or exemplary technical solutions of the present application, the drawings needed to be used in the embodiments or exemplary descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application and therefore should not be considered as limiting the scope, and it is also possible for those skilled in the art to obtain other drawings according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of a system module according to the present invention;
fig. 2 is a schematic diagram of the circuit structure of the present invention;
fig. 3 is a schematic diagram of the structure of the current detection of the present invention.
Fig. 4 is a waveform signal diagram obtained by limiting the generated constant current value by using the dc clamp meter of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments that can be obtained by a person skilled in the art without making any inventive step based on the embodiments in the present application belong to the protection scope of the present application, and the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Example 1
1-3, a voltage loop ground point detection system, comprising:
the device comprises a central processing unit, a current stabilization module, a signal detection module, a positioning module and a display module;
the central processing unit stores a reference current value detected by the circuit and a module operation instruction, and sends the instruction to the current stabilization module and the signal detection module;
the current stabilization module receives a signal operation instruction sent by the central processing unit, operates to generate a stabilized voltage, sets a stabilized voltage change time, acquires a constant current value according to the grounding resistor, generates a current signal, and sends the acquired current signal to the signal detection module;
after receiving an operation instruction sent by a central processing unit, the signal detection module receives a current signal sent by the current stabilization module, measures a current signal of a grounding circuit, compares and judges the received current signal and the measured current signal, sends a measurement position to the positioning module, and sends a judgment result to the display module;
the positioning module receives the measured position data sent by the signal detection module and stores the data;
the display module receives the judgment result sent by the signal detection module, sets a result display signal and displays a corresponding signal according to the received judgment result;
the system is explained below with reference to specific embodiments:
firstly, connecting system modules, including a power plug, a switch, a power stabilizer, a load power supply, an LCD display screen, a load voltage detection module, a constant current source module, a single chip microcomputer, a JTAG interface, a reference source module and an ISP interface, wherein the single chip microcomputer is a central processing unit, the load voltage detection module is a signal detection module, the constant current source module is a current stabilization module, the LCD display screen is a display module, and the modules are electrically connected by the current stabilization module, and refer to FIG. 2;
then when the grounding condition of a voltage loop needs to be detected, a power plug of the system is connected with a power supply, an operation switch is turned on, a reference current value and a module operation instruction detected by a circuit are stored in a single chip microcomputer, at the moment, the single chip microcomputer issues an instruction to a load voltage detection module and a constant current source module, the constant current source module receives the operation instruction and then generates a stable voltage by a power voltage stabilizer, as shown in figure 3, the generated stable voltage is connected with a 220V power supply in a terminal box of a voltage transformer, a converter is adopted to convert an output power supply mode into +/-12 DC to generate the stable voltage, two groups of voltage stabilizing tubes are used for limiting the load voltage and limiting the load voltage in a safety range, then a current value is obtained according to a grounding resistor and is used as a constant current value, the constant current principle is realized by using IC7, VT2 and R9, the formula principle is that the resistor is unchanged, the current is changed along with the voltage change, as long as the voltage is kept constant, a constant current value can be generated, and when the output voltage of a DAC is adjusted;
then, a direct current clamp meter is adopted to limit the generated constant current value, the current value is stabilized in a range of 0.1%, the range of the direct current clamp meter is defined as 0-100 mA, the minimum resolution is set to be +/-0.01 mA, the resistance is 5 omega, after a current signal is measured, when the output current is 100mA, the voltage between the output M600 and the ground is less than or equal to 0.5V, when the output current is 10mA, the voltage between the output M600 and the ground is less than or equal to 50mV, and a 100mA and 10mA waveform signal is output as shown in FIG. 4;
the signal current and the signal voltage adopt 0 → a certain value, and the period of the certain value is 3S;
the system processes a current signal generated by an obtained constant current value, processes zero drift generated in the current signal by adopting a wavelet analysis method, sends the processed current signal to a load voltage detection module, is provided with a time-trigger signal, sends the trigger signal to the load voltage detection module within a specified time, measures a current signal of a grounding circuit at the time point, receives the current signal sent by a constant current source module by a signal amplification module after the measurement is finished, amplifies the current signal, sends the amplified signal to a signal synchronization module, receives the amplified signal sent by the signal amplification module by the signal synchronization module, obtains a measured current signal of the grounding circuit, synchronizes the signal in the grounding current and the amplified signal, rejects currents of other components in the grounding current, and retains current signals of square waves with the same phase and angle;
then comparing and judging the received current signal and the measured current signal, sending the measured position to a system for storage and positioning, sending a judgment result to an LCD display, setting a result display signal by the system, and displaying a corresponding signal according to the received judgment result:
the amplified current signal is consistent with the ground current signal after being removed, the judgment result is that the ground point is one-point grounded, and the indicator light on the display is correspondingly displayed in green;
the amplified current signal is consistent with the ground current signal after being removed, the judgment result is that the ground point is one-point grounded, the indicator light on the display is correspondingly displayed in red, and the data of the measurement position stored by the positioning module is sent to the display screen;
the amplified current signal and the ground current signal after being removed are both 0, the judgment result is that the ground point is 0, and the indicator light on the display is correspondingly displayed to be yellow;
the utility model discloses carry out on-line measuring to the one point ground connection of transformer substation, the quick judgement voltage transformer secondary circuit voltage loop network multiple spot earth fault does not influence the correct measurement of measurement and control device to voltage.
The above-mentioned embodiments only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes, modifications and substitutions can be made, which are all within the scope of the present invention.
Claims (6)
1. A voltage loop ground detection system, comprising:
the device comprises a central processing unit, a current stabilization module, a signal detection module, a positioning module and a display module;
the central processing unit is used for storing a reference current value detected by the circuit and a module operation instruction, and sending the instruction to the current stabilization module and the signal detection module;
the current stabilizing module is used for receiving a signal operation instruction sent by the central processing unit, generating stable voltage by operation, setting stable voltage change time, acquiring a constant current value according to the grounding resistor, generating a current signal and sending the acquired current signal to the signal detection module;
the signal detection module is used for receiving an operation instruction sent by the central processing unit, receiving a current signal sent by the current stabilization module, measuring a current signal of the grounding circuit, comparing and judging the received current signal and the measured current signal, sending a measuring position to the positioning module, and sending a judgment result to the display module;
the positioning module is used for receiving the measured position data sent by the signal detection module and storing the data;
the display module is used for receiving the judgment result sent by the signal detection module, setting a result display signal and displaying a corresponding signal according to the received judgment result.
2. The voltage loop ground detection system of claim 1, wherein: the generated stable voltage is generated by connecting a 220V power supply in a terminal box of the voltage transformer and converting an output power supply mode into +/-12 DC by adopting a converter.
3. The voltage loop ground detection system of claim 1, wherein: the current stabilizing module comprises a limiting module, wherein the limiting module limits the generated constant current value by adopting a direct current clamp meter and stabilizes the current value within the range of 0.1%.
4. The voltage loop ground detection system of claim 3, wherein: the range of the direct current clamp meter is specified to be 0-100 mA, the minimum resolution is set to be +/-0.01 mA, and the measured current signal value is fed back to the processing module.
5. The voltage loop ground detection system of claim 1, wherein: the signal detection module comprises a timing module, wherein the timing module is provided with a time-trigger signal, the trigger signal is sent to the signal detection module within a set time, and a current signal of the grounding circuit at the time point is measured.
6. The system of claim 1, wherein the signal detection module further comprises a signal amplification module and a signal synchronization module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122611657.XU CN217766771U (en) | 2021-10-28 | 2021-10-28 | Voltage loop ground point detection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122611657.XU CN217766771U (en) | 2021-10-28 | 2021-10-28 | Voltage loop ground point detection system |
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| CN217766771U true CN217766771U (en) | 2022-11-08 |
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| CN202122611657.XU Active CN217766771U (en) | 2021-10-28 | 2021-10-28 | Voltage loop ground point detection system |
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