CN114200195B - Method for detecting current on magnetic field jumper loop based on Hall current converter - Google Patents
Method for detecting current on magnetic field jumper loop based on Hall current converter Download PDFInfo
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- CN114200195B CN114200195B CN202111458583.9A CN202111458583A CN114200195B CN 114200195 B CN114200195 B CN 114200195B CN 202111458583 A CN202111458583 A CN 202111458583A CN 114200195 B CN114200195 B CN 114200195B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a method for detecting current on a magnetic field jumper loop based on a Hall current converter, which comprises the following steps: 1: when current flows through the magnetic field jumper loop, the Hall current converter converts a current signal on the magnetic field jumper loop into an initial measurement voltage signal; 2: amplifying the initial measurement voltage signal, inputting a voltage stabilizing signal, and eliminating a zero drift component in the amplified voltage signal to obtain a voltage signal without zero drift influence; 3: comparing the voltage signal without zero drift effect with a reference voltage, and outputting a high-level signal or a low-level signal; 4: and outputting a high-level signal or a low-level signal in a delay way, sending out an alarm when the high-level signal is received, and not sending out an alarm when the low-level signal is received. The invention can effectively detect the current conduction in the magnetic field jumper loop, and can overcome the factors of easy zero drift and interference in the detection process, thereby effectively ensuring the timeliness and the correctness of the detection signal output.
Description
Technical Field
The invention belongs to the technical field of field de-excitation and overvoltage protection of large synchronous generators, and particularly relates to a method for detecting current on a magnetic field jumper loop based on a Hall current converter.
Background
The magnetic field jumper of the generator is connected to two ends of the synchronous generator magnetic field winding. When the large synchronous generator operates, if accident shutdown occurs, a magnetic field breaker in the generator exciting device is started to trip. Because the magnetic field energy storage of the large-scale generator is huge, the magnetic field breaker cannot safely de-magnetize, and the current in the magnetic field winding is transferred to the de-excitation resistor loop to freewheel when the magnetic field breaker trips, so that the magnetic field energy is consumed on the de-excitation resistor. The de-excitation resistor and the electronic switch thereof form the magnetic field jumper of the generator. The magnetic field jumper also has the function of protecting the magnetic field from overvoltage, and once the abnormal high voltage appears at the two ends of the magnetic field winding for a certain reason, the magnetic field jumper is immediately conducted to release the energy of the high voltage to the resistor, so that the insulation of the magnetic field winding is protected from being damaged.
Therefore, the current on the loop of the magnetic field jumper needs to be detected to judge whether the magnetic field jumper works normally or not. Generally, no current flows through the magnetic field jumper when the generator is in normal operation, but two conditions can cause the current to flow through the magnetic field jumper, so that an alarm needs to be given in time to start the generator to stop. Firstly, the electronic switch of the magnetic field jumper is supposed to be in a blocking state, because the blocking capability is aged down or is disturbed to be turned on by mistake. Secondly, the magnetic field overvoltage protection acts erroneously in normal operation, and the electronic switch is turned on.
When the generator is deactivated by tripping the field breaker due to an accident or shutdown schedule, current should flow through the field jumper loop. If the magnetic field jumper electronic switch is not turned on in time at this time and no current flows, an alarm signal should be sent to inform operators to check the equipment in time. Therefore, the current conduction detection signal is sent out as soon as possible at the initial stage of the generation of the magnetic field jumper current, that is, when the current value is small, so as to judge whether the magnetic field jumper works normally.
The single-machine capacity of the generator is developed to one hundred megawatts at present, the rated current of a magnetic field of a giant unit is close to ten thousand amperes, the de-excitation current of a limit accident calculated theoretically is up to twenty thousand amperes, and in most cases, the current flowing through a magnetic field jumper is de-excitation current in a single direction, which is different from the waveform of an alternating current short-circuit current on a public power grid. The huge unidirectional impact current property and the requirement of sending out detection signals under small current bring difficulty to the current conduction detection of the magnetic field jumper.
The existing magnetic field jumper current detection means have limitations. One is to detect the rising edge of a signal by using an electromagnetic current transformer; however, the alarm action value of the rising edge detection method is not easy to adjust and is easy to be subjected to false alarm due to interference. In addition, the current transformer is easy to be saturated in hysteresis and lose alarming function under the impact of multiple unidirectional de-excitation currents. The other type is to use a general electromagnetic overcurrent relay; however, since the electromagnetic overcurrent relay has limited current capacity, shunt measures must be taken, resulting in reduced alarm sensitivity. The relay is also formed by a magnet gathering core and a reed pipe, but the contact adhesion can occur after the large current impact of the generator accident demagnetization is encountered due to the magnetic sensitivity characteristic of the reed pipe, and the method is not easy to adjust the alarm action value. Therefore, there is a need to develop new technologies to improve upon them.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method for detecting the current on a magnetic field jumper loop, which can effectively detect the current conduction in the magnetic field jumper loop, overcome the factors which are easy to generate zero drift and interference in the detection process and further effectively ensure the timeliness and the accuracy of the detection signal output.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the method for detecting the current on the magnetic field jumper loop based on the Hall current converter is characterized by comprising the following steps of:
step 1: connecting a Hall current transformer with a magnetic field jumper loop, detecting the current on the magnetic field jumper loop by using the Hall current transformer, and when the current passes through the magnetic field jumper loop, converting a current signal on the magnetic field jumper loop into an initial measurement voltage signal by using the Hall current transformer and outputting the initial measurement voltage signal;
step 2: amplifying the initial measurement voltage signal, inputting a voltage stabilizing signal, and eliminating a zero drift component caused by a Hall current converter in the amplified voltage signal according to the voltage stabilizing signal to obtain a voltage signal without zero drift influence;
step 3: comparing the voltage signal without zero drift effect with a reference voltage, and outputting a high-level signal if the comparison result is larger than a high threshold voltage; if the comparison result is smaller than the low threshold voltage, outputting a low level signal;
step 4: and outputting a high-level signal or a low-level signal in a delay way, sending out an alarm when the high-level signal is received, and not sending out an alarm when the low-level signal is received.
In the step 1, the rated range of the Hall current converter is 2000A/4V.
And 2, subtracting the voltage stabilizing signal from the amplified voltage signal to obtain the voltage signal without zero drift influence in the step 2.
And in the step 2, the amplification factor of the initial measurement voltage signal is 80-120 times.
The reference voltage in step 3 is in the range of 2-10V.
The delay time in the step 4 is 100-200ms.
Step 2, amplifying the initial measurement voltage signal by using a differential measurement amplifier, and inputting a voltage stabilizing signal by using a zero drift compensation circuit through an output reference adjustment end of the differential measurement amplifier; in the step 3, a hysteresis comparison circuit is adopted for comparison, and a reference voltage adjusting circuit is adopted for adjusting the reference voltage of the hysteresis comparison circuit; in the step 4, a delay circuit is adopted to delay and output a high-level signal or a low-level signal, and an alarm circuit is adopted to send out an alarm; when the current on the magnetic field jumper loop is forward current, the voltage signal which is output after being processed by the differential measurement amplifier and has no zero drift effect enters a hysteresis comparison circuit; when the current on the magnetic field jumper loop is negative current, the voltage signal which is processed by the differential measurement amplifier and has no zero drift effect enters the hysteresis comparison circuit after being inverted by the inverter.
The alarm circuit comprises an action alarm circuit and a locking alarm circuit, the alarm circuit comprises a triode and a micro relay, and the triode is respectively connected with the delay circuit and the micro relay; the locking alarm circuit comprises a thyristor, a micro relay and a reset operation loop, wherein the thyristor is respectively connected with the delay circuit and the micro relay, and the reset operation loop is connected with the micro relay and used for resetting an alarm signal.
By adopting the technical scheme, the invention has the beneficial technical effects that:
1. the invention mainly adopts a Hall current converter to detect the conduction condition of current on a magnetic field jumper loop. The magnetic core of the Hall current converter is made of soft magnetic materials, and can bear large overload current and is not easy to generate particularly large hysteresis. However, when the machine set has rare limit working conditions such as no-load false excitation and field elimination, and the like, after the field elimination current of tens of thousands of amperes of accidents is impacted, the Hall current converter may drift at zero point due to hysteresis, and obvious errors are brought to small current measurement. In addition, the Hall current converter is easy to be interfered by surrounding environment when being positioned in the generator de-excitation device based on the principle of magneto-electric conversion. The problems of zero drift and interference resistance of the Hall current transformer are solved, so that the method is not widely applied to detect the current conduction condition of the magnetic field jumper. The invention can simply adjust the bias voltage to correct by adopting the specific method, overcomes the influence of two adverse factors of the Hall current converter, and can send out a signal when a current of tens of amperes flows in the circuit. When the circuit flows thousands or even tens of thousands of impact currents, the current detector can still ensure the accuracy of the action and continue to be used after simple inspection and adjustment, thereby quickly recovering the normal working point of the current detector
Furthermore, aiming at the characteristics of the variable amplitude and obvious time characteristics of the interference signals suffered by the Hall current converter, the invention delays outputting the high-level signal or the low-level signal, which can avoid the interference of the impact event and ensure the timeliness of the output of the detection signal.
2. In the specific method, the rated range of the Hall current converter is set to 2000A/4V, the amplification factor of an initial measurement voltage signal is set to 80-120 times, the range of a reference voltage is set to 2-10V, and the delay time is set to 100-200ms. The adoption of the setting of the specific parameters has the advantages that all links of the circuit can work in a coordinated manner, and the timeliness and the accuracy of the output of the current conduction detection alarm signal are ensured.
3. The invention is mainly based on detection of the Hall current converter, the differential measurement amplifier, the zero drift compensation circuit, the reference voltage regulating circuit, the hysteresis comparison circuit, the delay circuit and the alarm circuit, can timely and effectively detect the current conduction condition on the magnetic field jumper loop of the large synchronous generator, can accurately send out signals, and improves the safety of unit operation.
4. The invention can send out alarm when the current rises to more than tens of amperes, and can reset the alarm signal when the current drops to less than the action value of tens of amperes. The method has the advantages of high detection accuracy, timely alarm and the like.
Drawings
FIG. 1 is a flow chart of the present invention;
fig. 2 is a schematic circuit diagram of the present invention.
Marked in the figure as: 1. the device comprises a Hall current converter, a differential measuring amplifier, a zero drift compensation circuit, a hysteresis comparison circuit, a delay circuit, an action alarm circuit, a locking alarm circuit and a reference voltage regulating circuit, wherein the Hall current converter, the differential measuring amplifier, the zero drift compensation circuit, the hysteresis comparison circuit, the delay circuit, the action alarm circuit, the locking alarm circuit and the reference voltage regulating circuit are respectively arranged in sequence.
Detailed Description
Example 1
The embodiment discloses a method for detecting current on a magnetic field jumper loop based on a Hall current transformer, which can effectively detect current conduction in the magnetic field jumper loop, overcome factors which are easy to generate zero drift and interference in the detection process, and further effectively ensure timeliness and correctness of detection signal output. Specifically, as shown in fig. 1, the method specifically includes the following steps:
step 1: the Hall current converter is used for detecting the current in the magnetic field jumper loop of the generator, and converting the large current in the magnetic field jumper loop into a small voltage signal which can be processed by the weak current loop. When current flows through the magnetic field jumper loop, the Hall current converter converts a current signal on the magnetic field jumper loop into an initial measurement voltage signal and outputs the initial measurement voltage signal.
In this step, the current on the loop is large when the magnetic field jumper is on, the current varies with the generator model and its working condition, and the maximum value of the current may range from several hundred to approximately two Mo Anpei. The hall current transducer can convert a larger current signal into a voltage of a few volts as an initial measurement voltage signal. For the purpose of current conduction detection, a hall current transformer is not required to be selected according to the full range, and the rated range of the hall current transformer is usually preferably 2000A/4V.
Step 2: amplifying the initial measurement voltage signal to obtain an amplified voltage signal, wherein the amplification factor can be set to 80-120 times; and meanwhile, inputting a voltage stabilizing signal, wherein the voltage of the voltage stabilizing signal can be correspondingly adjusted according to the situation, then eliminating zero drift components caused by a Hall current converter in the amplified voltage signal according to the input voltage stabilizing signal, and obtaining the voltage signal without zero drift influence after eliminating the zero drift components.
In the step, the voltage signal without zero drift influence is obtained by subtracting the voltage stabilizing signal from the amplified voltage signal.
Step 3: comparing the voltage signal without zero drift effect with a reference voltage, wherein the range of the reference voltage can be set to be 2-10V, and if the comparison result is larger than the high threshold voltage, outputting a high-level signal; if the comparison result is smaller than the low threshold voltage, a low level signal is output.
Step 4: the delay time can be set to 100-200ms, then the alarm is sent out when the high level signal is received, and the alarm is not sent out when the low level signal is received.
Example 2
The embodiment discloses a method for detecting current on a magnetic field jumper loop based on a Hall current converter. The number of the hysteresis comparison circuit, the delay circuit and the alarm circuit is two, one set of the hysteresis comparison circuit, the delay circuit and the alarm circuit form a positive current judgment branch according to the relation that the hysteresis comparison circuit, the delay circuit and the alarm circuit are sequentially connected, and the other set of the hysteresis comparison circuit, the delay circuit and the alarm circuit are matched with an inverter to form a negative current judgment branch.
Further, as shown in fig. 2, the connection relationship of each composition is: the generator comprises a field jumper loop of a de-excitation resistor and an electronic switch, wherein the field jumper loop is connected to two ends of a field winding, the input end of a Hall current converter is connected with the field jumper loop, the output end of the Hall current converter is connected with the input end of a differential measurement amplifier, a zero drift compensation circuit is connected with an output reference adjustment end of the differential measurement amplifier, a reference voltage adjustment circuit is respectively connected to the reference end of a hysteresis comparison circuit, and the output end of the differential measurement amplifier is respectively connected with a hysteresis comparison circuit in a positive current judgment branch and an inverter in a negative current judgment branch.
In this embodiment, the hall current transformer, the differential measurement amplifier, the zero drift compensation circuit, the hysteresis comparison circuit, the delay circuit and the alarm circuit are all conventional commercially available components, and in order to ensure the correctness and timeliness of current detection, the embodiment further sets the components as follows:
1. the Hall current converter is a device purchased in the market, and has the function of detecting the current in the magnetic field jumper loop of the generator, converting the large current on the magnetic field jumper loop into the weak current loop, processing a smaller initial measurement voltage signal and outputting the signal, wherein the rated range of the Hall current converter is preferably 2000A/4V.
2. The differential measurement amplifier adopts a differential measurement amplifying chip for amplifying an initial measurement voltage signal from the Hall current converter, and can amplify the initial measurement voltage signal with millivolt level to a level of a few volts for subsequent processing. In this embodiment, the measurement amplification factor is preferably set to 100 times, and the initial measurement voltage signal (corresponding to the current of about 30A on the primary side of the hall current-transducer) input at 60mV can be amplified to 6V.
3. Because the output of the hall current transformer has zero drift, if the generator accident de-excitation occurs, the magnetic field jumper may flow thousands of currents even up to Mo Anpei, and the zero drift of the hall current transformer is aggravated after the accident. The zero drift of the Hall current converter is amplified, so that the correct alarm judgment can be influenced. Therefore, the zero drift compensation circuit is an adjustable high-precision voltage stabilizing signal, the voltage stabilizing signal is sent to the reference adjusting end of the differential amplifying chip, and the zero drift part is subtracted from the output of the amplifying circuit, so that the zero drift component caused by the Hall current converter contained in the amplified voltage signal is eliminated, and the voltage signal without the zero drift effect can be obtained. The zero drift compensation circuit mainly comprises a voltage stabilizing diode, a potentiometer and a voltage follower.
4. The hysteresis comparison circuit is used for comparing the amplified voltage signal without zero drift effect with a reference voltage, and if the comparison result is larger than a high threshold voltage, the hysteresis comparison circuit outputs a high-level signal to drive a subsequent alarm circuit to alarm. If the comparison result is smaller than the low threshold voltage, the hysteresis comparison circuit outputs a low-level signal and does not give an alarm. The hysteresis comparison circuit can prevent the pumping phenomenon that the alarm output frequently acts repeatedly and resets. In this embodiment, the reference voltage setting is preferably 5V, and the hysteresis comparator circuit is preferably designed to emit a high level action at about field jumper current 35A, 20A current reset. The hysteresis comparison circuit is mainly composed of an operational amplifier.
5. The Hall current converter is interfered by a space magnetic field caused by the operation of surrounding switches, relays and the like, and is characterized in that the amplitude of the interference is variable, and a filtering method in a measuring link is not suitable. Therefore, the delay circuit can delay the output of the result of the hysteresis comparison circuit for a period of time, and false alarm caused by the interference of the space magnetic field can be avoided. In this embodiment, the delay circuit is formed by a 555 timing chip, and the delay time of the delay circuit is preferably designed to be 100 ms-200 ms. Through experiments and demonstration, the delay circuit adopts the specific design, so that the interference of surrounding impact events can be avoided, and the timeliness of the output of the detection signal can be ensured.
On the basis of the above, the detection method of the present embodiment specifically includes the following steps:
step 1: the Hall current transformer is connected with the magnetic field jumper loop, the Hall current transformer is used for detecting the current on the magnetic field jumper loop, and when the current flows through the magnetic field jumper loop, the Hall current transformer converts the current signal on the magnetic field jumper loop into an initial measurement voltage signal and outputs the initial measurement voltage signal.
Step 2: the differential measurement amplifier amplifies the initial measurement voltage signal, and the zero drift compensation circuit inputs the stabilized voltage signal, and eliminates the zero drift component caused by the Hall current converter in the amplified voltage signal according to the stabilized voltage signal to obtain the voltage signal without zero drift influence.
Step 3: the reference voltage of the hysteresis comparison circuit is regulated by the reference voltage regulating circuit, the voltage signal without zero drift influence is compared with the reference voltage by the hysteresis comparison circuit, and if the comparison result is larger than the high threshold voltage, a high-level signal is output; if the comparison result is smaller than the low threshold voltage, a low level signal is output.
Step 4: the delay circuit delays and outputs a high-level signal or a low-level signal, and when the high-level signal is received by the alarm circuit, the alarm circuit gives an alarm, and when the low-level signal is received, the alarm is not given.
When the electronic switch T1 in fig. 2 is turned on, the forward current passes through the magnetic field jumper loop, and at this time, the hall current transformer converts the forward high current signal on the loop into the forward small initial measurement voltage signal and inputs the forward small initial measurement voltage signal into the differential measurement amplifier, and after the initial measurement voltage signal is compensated in the differential measurement amplifier by the zero drift compensation circuit to eliminate the zero drift effect caused by the hall transformer, the output voltage signal without the zero drift effect enters the forward current judgment branch to carry out comparison judgment. When the electronic switch T2 in fig. 2 is turned on, the negative current passes through the magnetic field jumper loop, and at this time, the hall current transformer converts the negative large current signal on the loop into the negative small initial measurement voltage signal and inputs the negative small initial measurement voltage signal into the differential measurement amplifier, the initial measurement voltage signal is compensated by the zero drift compensation circuit in the differential measurement amplifier to eliminate the zero drift influence of the hall transformer, and the output voltage signal without the zero drift influence is reversely transmitted by the inverter and then input into the positive current judgment branch for comparison and judgment.
The present embodiment further defines an action alarm circuit and a lock alarm circuit, as shown in fig. 2, where the alarm circuit includes an action alarm circuit and a lock alarm circuit, and the action alarm circuit and the lock alarm circuit are both connected to an output end of the delay circuit. Wherein, the liquid crystal display device comprises a liquid crystal display device,
the action alarm circuit comprises a triode and a micro relay, wherein the triode is respectively connected with the output end of the delay circuit and the micro relay. The action alarm circuit converts the output of the delay circuit into relay signal output, and the output relay is reset after the output of the delay circuit is reset. The alarm signal indicates that current is flowing through the magnetic field jumper and that current has not fallen below the reset level.
The locking alarm circuit comprises a thyristor, a micro relay and a reset operation loop, wherein the thyristor is respectively connected with the output end of the delay circuit and the micro relay, and the reset operation loop is connected with the micro relay and is used for resetting an alarm signal. The locking alarm circuit converts the output of the delay circuit into a relay signal output and locks the relay in the action position. The alarm signal indicates that current is flowing through the magnetic field jumper or once, and is reset manually after the delay circuit outputs a reset.
While the invention has been described with reference to certain embodiments, it is understood that any feature disclosed in this specification may be replaced by alternative features serving the equivalent or similar purpose, unless expressly stated otherwise; all of the features disclosed, or all of the steps in a method or process, except for mutually exclusive features and/or steps, may be combined in any manner.
Claims (7)
1. The method for detecting the current on the magnetic field jumper loop based on the Hall current converter is characterized by comprising the following steps of:
step 1: connecting a Hall current transformer with a magnetic field jumper loop, detecting the current on the magnetic field jumper loop by using the Hall current transformer, and when the current passes through the magnetic field jumper loop, converting a current signal on the magnetic field jumper loop into an initial measurement voltage signal by using the Hall current transformer and outputting the initial measurement voltage signal;
step 2: amplifying the initial measurement voltage signal, inputting a voltage stabilizing signal, and eliminating a zero drift component caused by a Hall current converter in the amplified voltage signal according to the voltage stabilizing signal to obtain a voltage signal without zero drift influence;
step 3: comparing the voltage signal without zero drift effect with a reference voltage, and outputting a high-level signal if the comparison result is larger than a high threshold voltage; if the comparison result is smaller than the low threshold voltage, outputting a low level signal;
step 4: delay-outputting a high-level signal or a low-level signal, sending an alarm when receiving the high-level signal, and not sending an alarm when receiving the low-level signal;
and 2, subtracting the voltage stabilizing signal from the amplified voltage signal to obtain the voltage signal without zero drift influence in the step 2.
2. The method for detecting current in a magnetic field jumper loop based on a hall current transformer according to claim 1, wherein: in the step 1, the rated range of the Hall current converter is 2000A/4V.
3. The method for detecting current in a magnetic field jumper loop based on a hall current transformer according to claim 1, wherein: and in the step 2, the amplification factor of the initial measurement voltage signal is 80-120 times.
4. The method for detecting current in a magnetic field jumper loop based on a hall current transformer according to claim 1, wherein: the reference voltage in step 3 is in the range of 2-10V.
5. The method for detecting current in a magnetic field jumper loop based on a hall current transformer according to claim 1, wherein: the delay time in the step 4 is 100-200ms.
6. The method for detecting current on a magnetic field jumper loop based on a hall current transducer according to any of claims 1-5, wherein: step 2, amplifying the initial measurement voltage signal by using a differential measurement amplifier, and inputting a voltage stabilizing signal by using a zero drift compensation circuit through an output reference adjustment end of the differential measurement amplifier; in the step 3, a hysteresis comparison circuit is adopted for comparison, and a reference voltage adjusting circuit is adopted for adjusting the reference voltage of the hysteresis comparison circuit; in the step 4, a delay circuit is adopted to delay and output a high-level signal or a low-level signal, and an alarm circuit is adopted to send out an alarm; when the current on the magnetic field jumper loop is forward current, the voltage signal which is output after being processed by the differential measurement amplifier and has no zero drift effect enters a hysteresis comparison circuit; when the current on the magnetic field jumper loop is negative current, the voltage signal which is processed by the differential measurement amplifier and has no zero drift effect enters the hysteresis comparison circuit after being inverted by the inverter.
7. The method for detecting current in a magnetic field jumper loop based on a hall current transducer of claim 6, wherein: the alarm circuit comprises an action alarm circuit and a locking alarm circuit, the alarm circuit comprises a triode and a micro relay, and the triode is respectively connected with the delay circuit and the micro relay; the locking alarm circuit comprises a thyristor, a micro relay and a reset operation loop, wherein the thyristor is respectively connected with the delay circuit and the micro relay, and the reset operation loop is connected with the micro relay and used for resetting an alarm signal.
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| CN114200195A (en) | 2022-03-18 |
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