CN112180145A - Post-arc field emission current measurement compensation system for arc extinguish chamber - Google Patents
Post-arc field emission current measurement compensation system for arc extinguish chamber Download PDFInfo
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- CN112180145A CN112180145A CN202011050760.5A CN202011050760A CN112180145A CN 112180145 A CN112180145 A CN 112180145A CN 202011050760 A CN202011050760 A CN 202011050760A CN 112180145 A CN112180145 A CN 112180145A
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Abstract
The invention provides a post-arc field emission current measurement and compensation system for an arc extinguish chamber. Wherein: the recovery voltage measuring module comprises a high-voltage probe and a first oscilloscope and is used for measuring the recovery voltage of the contact gap of the arc extinguish chamber; the field emission current measuring module comprises a non-inductive resistor and a second oscilloscope which are used for measuring the voltage of the non-inductive resistor; the obtained contact gap recovery voltage and the obtained post-arc non-inductive resistor voltage are adjusted and compensated by the current compensation module, and then accurate field emission current is output. The invention realizes the online compensation of the field emission current.
Description
Technical Field
The invention relates to the technical field of arc extinguish chambers, in particular to a post-arc field emission current measurement compensation system for an arc extinguish chamber.
Background
The power system is an instant balance system, a large amount of reactive power can be generated in the operation process of the system, and the voltage of the power system can deviate due to the reactive power to generate loss; therefore, reactive power compensation plays an important role in maintaining safe, high-quality and economic operation of the power grid. When the reactive power compensation is carried out on the electric power system, the capacitor bank is switched to generate reactive power in a most economical and effective mode. The vacuum circuit breaker can be switched on and off when high frequency zero crossing generated by pre-breakdown, re-ignition and re-breakdown occurs, however, in experimental research and actual operation conditions of a power system, the vacuum circuit breaker has a high risk of re-breakdown when switching capacitive loads, particularly when switching back-to-back capacitor banks. Among them, the field emission current is considered as one of important factors to induce the capacitive breaking and re-breakdown phenomenon.
Chinese patent CN110058135A published in 7/26/2019 provides an inter-contact field emission current detection test system for an arc-extinguishing chamber, which comprises a voltage source, a transformer, a control switch, a voltage divider, a test arc-extinguishing chamber, a non-inductive resistor and a transient voltage suppressor; wherein: one side of the transformer is connected with the voltage source, and the other side of the transformer is sequentially connected with the control switch and the voltage divider; the test arc extinguish chamber is connected with the non-inductive resistor, and the test arc extinguish chamber is connected with the non-inductive resistor in series and then connected with the voltage divider in parallel; the transient voltage suppressor is connected with the non-inductive resistor in parallel, and the non-inductive resistor is far away from the input end of the test sample arc extinguish chamber and is grounded. The system can only realize the measurement of the field emission current between the contacts for the arc extinguish chamber, and cannot realize the online compensation of the field emission current.
Disclosure of Invention
The invention provides a post-arc field emission current measurement compensation system for an arc extinguish chamber, aiming at overcoming the defect that the prior art cannot compensate field emission current on line.
The technical scheme of the invention is as follows:
the invention provides a post-arc field emission current measurement compensation system for an arc extinguish chamber, which comprises a recovery voltage measurement module, a field emission current measurement module and a current compensation module, wherein the recovery voltage measurement module is used for measuring the current of the arc extinguish chamber;
the recovery voltage measuring module comprises a high-voltage probe and a first oscilloscope;
the field emission current measuring module comprises a non-inductive resistor and a second oscilloscope;
the current compensation module comprises a differential circuit unit and an adder, wherein the adder comprises an adder first input end, an adder second input end and an adder output end;
the high-voltage probe acquires a voltage signal of the arc extinguish chamber, the output end of the high-voltage probe is connected with the input end of a first oscilloscope, the output end of the first oscilloscope is connected with the input end of a differential circuit unit, and the output end of the differential circuit unit is connected with the first input end of the adder;
the noninductive resistor is connected with the arc extinguish chamber in series, the second oscilloscope collects voltage signals of the noninductive resistor, and the output end of the second oscilloscope is connected with the second input end of the adder;
the differential circuit performs amplification and differential operation on the obtained contact gap recovery voltage, and the adder performs summation operation on the arc extinguish chamber contact gap recovery voltage and the voltage of the non-inductive resistor.
And the output quantity of the output end of the adder is the compensated accurate field emission current.
Preferably, the high-voltage probe is further provided with a grounding terminal. The ground terminal is used for protecting the first oscilloscope and an experimenter.
Preferably, the high voltage probe is a high voltage differential probe.
Preferably, the high-voltage probe is of type ETA 5026.
Preferably, the field emission current measurement module further comprises an anti-parallel diode, and the anti-parallel diode is connected in parallel with the non-inductive resistor. The reverse parallel diode has a conduction voltage, and when the voltage on the non-inductive resistor exceeds the conduction voltage, the reverse parallel diode is conducted to form overvoltage protection on the non-inductive resistor.
Preferably, the field emission current measurement module further comprises a gas discharge tube connected in parallel with the non-inductive resistor. When the voltage on the non-inductive resistor exceeds the insulation strength of the gas between the gas discharge tubes, the tubes are broken down, and the original insulation state is converted into a conductive state, so that the overvoltage protection of the non-inductive resistor is formed.
Preferably, the field emission current measurement module further comprises a transient suppressor connected in parallel with the non-inductive resistor. When the arc extinguish chamber is broken down and the transient suppressor is impacted by transient high energy, the high impedance between the two poles of the transient suppressor can be quickly changed into low impedance, surge power is absorbed, and the non-inductive resistor and the second oscilloscope are effectively protected from being damaged by surge current.
Preferably, the transient suppressor is a bidirectional transient suppression diode.
Preferably, the current compensation module further comprises a first voltage follower;
the input end of the first voltage follower is connected with the output end of the first oscilloscope, and the output end of the first voltage follower is connected with the input end of the differential circuit unit.
Preferably, the current compensation module further comprises a second voltage follower;
the input end of the second voltage follower is connected with the output end of the second oscilloscope, and the output end of the second voltage follower is connected with the second input end of the adder.
The first voltage follower and the second voltage follower are used as isolation circuits to isolate signals output by the first oscilloscope and the second oscilloscope from subsequent circuits, so that the subsequent circuits are protected.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that: the invention realizes the accurate measurement of the contact gap recovery voltage and the post-arc non-inductive resistance voltage through the recovery voltage measuring module and the field emission current measuring module, and outputs the accurate field emission current after the adjustment and compensation of the current compensation module, thereby realizing the online compensation of the field emission current.
Drawings
Fig. 1 is a schematic diagram of a post-arc field emission current measurement compensation system for an arc extinguishing chamber according to embodiment 1;
FIG. 2 is a schematic diagram of a post-arc field emission current measurement compensation system for an arc extinguishing chamber according to embodiment 2;
wherein: 1-high voltage probe, 2-noninductive resistor, 3-inverse parallel diode, 4-gas discharge tube and 5-transient suppressor.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
The embodiment provides a post-arc field emission current measurement compensation system for an arc extinguish chamber, as shown in fig. 1, the system comprises a recovery voltage measurement module, a field emission current measurement module and a current compensation module;
the recovery voltage measuring module comprises a high-voltage probe 1 and a first oscilloscope;
the field emission current measuring module comprises a non-inductive resistor 2 and a second oscilloscope;
the current compensation module comprises a differential circuit unit and an adder, wherein the adder comprises an adder first input end, an adder second input end and an adder output end;
the high-voltage probe 1 acquires a voltage signal of the arc extinguish chamber, the output end of the high-voltage probe 1 is connected with the input end of a first oscilloscope, the output end of the first oscilloscope is connected with the input end of a differential circuit unit, and the output end of the differential circuit unit is connected with the first input end of the adder;
the noninductive resistor 2 is connected with the arc extinguish chamber in series, the second oscilloscope collects voltage signals of the noninductive resistor 2, and the output end of the second oscilloscope is connected with the second input end of the adder;
the differential circuit performs amplification and differential operation on the obtained contact gap recovery voltage, and the adder performs summation operation on the arc extinguish chamber contact gap recovery voltage and the voltage of the non-inductive resistor 2.
And the output quantity of the output end of the adder is the compensated accurate field emission current.
In the embodiment, the recovery voltage measurement module and the field emission current measurement module are used for accurately measuring the contact gap recovery voltage and the post-arc non-inductive resistance voltage, and the current compensation module is used for adjusting and outputting the accurate field emission current, so that the on-line compensation of the field emission current is realized.
Example 2
The present embodiment provides a post-arc field emission current measurement compensation system for an arc extinguish chamber, as shown in fig. 2, the system includes a recovery voltage measurement module, a field emission current measurement module, and a current compensation module;
the recovery voltage measuring module comprises a high-voltage probe 1 and a first oscilloscope;
the field emission current measuring module comprises a non-inductive resistor 2 and a second oscilloscope;
the current compensation module comprises a differential circuit unit and an adder, wherein the adder comprises an adder first input end, an adder second input end and an adder output end;
the high-voltage probe 1 acquires a voltage signal of the arc extinguish chamber, the output end of the high-voltage probe 1 is connected with the input end of a first oscilloscope, the output end of the first oscilloscope is connected with the input end of a differential circuit unit, and the output end of the differential circuit unit is connected with the first input end of the adder;
the noninductive resistor 2 is connected with the arc extinguish chamber in series, the second oscilloscope collects voltage signals of the noninductive resistor 2, and the output end of the second oscilloscope is connected with the second input end of the adder;
the differential circuit performs amplification and differential operation on the obtained contact gap recovery voltage, and the adder performs summation operation on the arc extinguish chamber contact gap recovery voltage and the voltage of the non-inductive resistor 2.
And the output quantity of the output end of the adder is the compensated accurate field emission current.
The high-voltage probe 1 is also provided with a grounding terminal, and the grounding terminal is used for protecting the first oscilloscope and an experimenter.
The high-voltage probe 1 is a high-voltage differential probe.
The model of the high-voltage probe 1 is ETA 5026.
The field emission current measuring module further comprises an anti-parallel diode 3, and the anti-parallel diode 3 is connected with the non-inductive resistor 2 in parallel. The anti-parallel diode 3 has a conducting voltage, and when the voltage on the non-inductive resistor 2 exceeds the conducting voltage, the anti-parallel diode 3 is conducted to form overvoltage protection for the non-inductive resistor 2.
The field emission current measuring module further comprises a gas discharge tube 4, and the gas discharge tube 4 is connected with the non-inductive resistor 2 in parallel. When the voltage on the non-inductive resistor 2 exceeds the insulation strength of the gas between the gas discharge tubes 4, the tubes are broken down, and the original insulation state is converted into a conductive state, so that the overvoltage protection of the non-inductive resistor 2 is formed.
The field emission current measuring module further comprises a transient suppressor 5, wherein the transient suppressor 5 is connected with the non-inductive resistor 2 in parallel. When the arc extinguish chamber is broken down, the transient suppressor 5 can rapidly change the high impedance between the two poles into low impedance when being impacted by transient high energy, so as to absorb surge power and effectively protect the non-inductive resistor 2 and the second oscilloscope from being damaged by surge current.
The transient suppressor 5 is a bidirectional transient suppressor diode.
The current compensation module also comprises a first voltage follower;
the input end of the first voltage follower is connected with the output end of the first oscilloscope, and the output end of the first voltage follower is connected with the input end of the differential circuit unit.
The current compensation module also comprises a second voltage follower;
the input end of the second voltage follower is connected with the output end of the second oscilloscope, and the output end of the second voltage follower is connected with the second input end of the adder.
The first voltage follower and the second voltage follower are used as isolation circuits to isolate signals output by the first oscilloscope and the second oscilloscope from subsequent circuits, so that the subsequent circuits are protected.
The principle of the embodiment is as follows:
the noninductive resistor 2 is connected with the arc extinguish chamber in series, the second oscilloscope measures the total voltage at two ends of the noninductive resistor 2, the total voltage is composed of the voltage generated by the field emission current flowing through the noninductive resistor and the voltage generated by the capacitive component current flowing through the noninductive resistor, and the total voltage is input to the second input end of the adder through the second voltage follower.
The high-voltage probe 1 is connected with the arc extinguish chamber in parallel, the contact gap recovery voltage of the arc extinguish chamber is obtained through measurement, the contact gap recovery voltage is input to the differential circuit unit through the first oscilloscope and the first voltage follower, the differential circuit unit adjusts the contact gap recovery voltage, the obtained voltage is equal to the voltage value generated by capacitive component current flowing through the non-inductive resistor, the polarity of the voltage is opposite, and the adjusted voltage is input to the first input end of the adder.
The adder sums the voltages input to the first input end of the adder and the second input end of the adder, namely adds the voltage generated by capacitive component current with opposite polarity flowing through the non-inductive resistor to the total voltage to obtain the voltage generated by the field emission current flowing through the non-inductive resistor; the voltage generated by the field emission current flowing through the non-inductive resistor is divided by the resistance value of the non-inductive resistor to obtain the accurate field emission current.
In the embodiment, the recovery voltage measurement module and the field emission current measurement module are used for accurately measuring the contact gap recovery voltage and the post-arc non-inductive resistance voltage, and the current compensation module is used for adjusting and outputting the accurate field emission current, so that the on-line compensation of the field emission current is realized. In addition, safety protection for each module and experimenters of the system is realized by arranging protection measures such as a grounding terminal, an anti-parallel diode, a gas discharge tube, a transient suppressor, a first voltage follower and a second voltage follower.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A post-arc field emission current measurement compensation system for an arc extinguish chamber is characterized by comprising a recovery voltage measurement module, a field emission current measurement module and a current compensation module;
the recovery voltage measuring module comprises a high-voltage probe (1) and a first oscilloscope;
the field emission current measuring module comprises a non-inductive resistor (2) and a second oscilloscope;
the current compensation module comprises a differential circuit unit and an adder, wherein the adder comprises an adder first input end, an adder second input end and an adder output end;
the high-voltage probe (1) collects a voltage signal of the arc extinguish chamber, the output end of the high-voltage probe (1) is connected with the input end of a first oscilloscope, the output end of the first oscilloscope is connected with the input end of a differential circuit unit, and the output end of the differential circuit unit is connected with the first input end of an adder;
the noninductive resistor (2) is connected with the arc extinguish chamber in series, the second oscilloscope collects voltage signals of the noninductive resistor (2), and the output end of the second oscilloscope is connected with the second input end of the adder;
and the output quantity of the output end of the adder is the compensated accurate field emission current.
2. A post-arc field emission current measurement compensation system for an arc chute according to claim 1, characterized in that the high voltage probe (1) is further provided with a ground terminal.
3. A post-arc field emission current measurement compensation system for arc chutes as claimed in claim 2 wherein the high voltage probe (1) is a high voltage differential probe.
4. A post-arc field emission current measurement compensation system for arc extinguishing chambers according to claim 3, characterized in that the high voltage probe (1) is of the type ETA 5026.
5. A post-arc field emission current measurement compensation system for an arc chute according to claim 4, characterized in that the field emission current measurement module further comprises an anti-parallel diode (3), and the anti-parallel diode (3) is connected in parallel with the non-inductive resistor (2).
6. A post-arc field emission current measurement compensation system for arc chutes as claimed in claim 5 wherein the field emission current measurement module further comprises a gas discharge tube (4), the gas discharge tube (4) being connected in parallel with the non-inductive resistor (2).
7. A post-arc field emission current measurement compensation system for an arc chute according to claim 6 wherein said field emission current measurement module further comprises a transient suppressor (5), said transient suppressor (5) being connected in parallel with said non-inductive resistor (2).
8. A post-arc field emission current measurement compensation system for an arc chute according to claim 7 wherein the transient suppressor (5) is a bi-directional transient suppressor diode.
9. The system for compensating current measurement for post-arc field emission of an arc chute according to claim 8, wherein said current compensation module further comprises a first voltage follower;
the input end of the first voltage follower is connected with the output end of the first oscilloscope, and the output end of the first voltage follower is connected with the input end of the differential circuit unit.
10. The system for compensating current measurement of field emission after arc extinguishing chamber according to claim 8, wherein said current compensation module further comprises a second voltage follower;
the input end of the second voltage follower is connected with the output end of the second oscilloscope, and the output end of the second voltage follower is connected with the second input end of the adder.
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Cited By (2)
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| CN114325186A (en) * | 2021-12-28 | 2022-04-12 | 南京航空航天大学 | Method for obtaining field emission current and test device |
| CN116125135A (en) * | 2023-04-17 | 2023-05-16 | 南方电网数字电网研究院有限公司 | Temperature self-compensating tunneling magneto-resistance current sensor, current measuring method and device |
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