CN112034391A - Acquisition circuit of power system relay protection device and mutual inductor detection method - Google Patents
Acquisition circuit of power system relay protection device and mutual inductor detection method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses a collecting circuit of a relay protection device of a power system, which comprises: the device comprises a voltage transformer or a current transformer, a parallel grounding resistor, a second-order low-pass anti-aliasing filter and an analog-to-digital conversion chip ADC; further comprising: the secondary side broken line detection component of the mutual inductor is a series branch circuit connected in series with a parallel ground resistor and comprises a controllable switch; when the analog-to-digital conversion chip ADC acquires a normal voltage signal or a normal current signal, the main processor CPU controls the controllable switch to be switched off, so that the acquired signal is not influenced by the secondary side broken line detection assembly of the mutual inductor; and if the voltage acquired by the analog-to-digital conversion chip ADC is 0, the main processor CPU controls the controllable switch to be closed, and judges whether the secondary side of the transformer is disconnected according to the voltage signal value. A mutual inductor detection method of the relay protection device of the power system is also disclosed. Whether the secondary side of the mutual inductor is broken or not is judged by judging the voltage value collected by the CPU of the main processor, and the method has the advantages of high detection speed, high detection accuracy and the like.
Description
Technical Field
The invention relates to the technical field of power system relay protection, in particular to a power system relay protection device acquisition circuit and a mutual inductor detection method.
Background
At present, as shown in fig. 1, a voltage and current acquisition circuit of a relay protection device of a power system is characterized in that a voltage Uin or a current Iin is input through a primary side of a transformer, an induced voltage is generated at two ends of a secondary side resistor, an acquired voltage signal passes through an anti-aliasing filter, high-frequency noise is filtered out, the high-frequency noise enters an ADC chip, the ADC chip converts the acquired voltage signal from an analog quantity to a digital quantity and transmits the digital quantity to a main processor CPU, and the main processor CPU monitors and processes the acquired voltage signal and data, namely, the acquisition of the voltage signal or the.
When the voltage Uin or the current Iin is equal to zero, the voltage value acquired by the ADC chip is zero, and in the other case, when the secondary side of the transformer is disconnected at the disconnection position or the disconnection position, the voltage value acquired by the ADC chip is also zero. Conversely, when the voltage value acquired by the ADC chip is zero, the relay protection device cannot distinguish whether the input voltage Uin or the current Iin is equal to zero or the secondary side of the transformer is disconnected at the moment, and thus cannot perform alarm indication on the secondary side disconnection fault of the transformer.
Disclosure of Invention
The embodiment of the invention aims to provide an acquisition circuit of a relay protection device of a power system and a mutual inductor detection method, wherein a series of branch circuits are added, when the voltage acquired by a main processor CPU is zero, a controllable switch in the series of branch circuits is controlled to be closed, and whether the secondary side of the mutual inductor is disconnected or not is judged by judging the voltage value acquired by the main processor CPU.
In order to solve the above technical problem, a first aspect of an embodiment of the present invention provides an acquisition circuit for a relay protection device of a power system, including: the device comprises a voltage transformer or a current transformer, a parallel grounding resistor, a second-order low-pass anti-aliasing filter and an analog-to-digital conversion chip ADC;
a voltage signal or a current signal is input through the primary side of the mutual inductor, the secondary side of the mutual inductor, the parallel grounding resistor, the second-order low-pass anti-aliasing filter and the analog-to-digital conversion chip ADC are sequentially connected to complete the acquisition of the voltage signal or the current signal, and the voltage signal data or the current signal data are transmitted to a main processor CPU for monitoring and data processing;
further comprising: the secondary side broken line detection component of the mutual inductor is a series branch circuit which is connected with the parallel ground resistor in series and comprises a controllable switch; when the analog-to-digital conversion chip ADC acquires the normal voltage signal or the normal current signal, the main processor CPU controls the controllable switch to be switched off, so that the acquired signal is not influenced by the secondary side disconnection detection assembly of the mutual inductor; and if the voltage acquired by the analog-to-digital conversion chip ADC is 0, the main processor CPU controls the controllable switch to be closed, and judges whether the secondary side of the transformer is disconnected according to the voltage signal value acquired at the moment.
Further, the mutual inductor secondary side disconnection detection assembly further comprises a series resistor and a direct current reference voltage VCC, and the controllable switch, the series resistor and the direct current reference voltage VCC are connected to form a series branch.
Further, the second-order low-pass anti-aliasing filter comprises a first filter resistor, a second filter resistor, a third filter resistor, a fourth filter resistor, a first filter capacitor and a second filter capacitor;
the first filter resistor is connected with the second filter resistor in series, the first filter resistor is connected with one end of the secondary side of the mutual inductor, and the second filter resistor is connected with one input end of the analog-to-digital conversion chip ADC; the third filter resistor is connected with the fourth filter resistor in series, the third filter resistor is connected with the other end of the secondary side of the mutual inductor, and the fourth filter resistor is connected with the other input end of the analog-to-digital conversion chip ADC; two ends of the first filter capacitor are respectively connected to the connection point of the first filter resistor and the second filter resistor and the connection point of the third filter resistor and the fourth filter resistor; the second filter capacitor is connected in parallel to the input end of the analog-to-digital conversion chip ADC.
Further, when the voltage signal value acquired by the analog-to-digital conversion chip ADC is 0, the main processor CPU controls the controllable switch to be closed and judges;
if the value of the collected voltage signal is equal to the value of the collected voltage signal
When the current transformer is in a normal state, indicating that the secondary side of the transformer is not broken;
when the value of the collected voltage signal is equal to
When the fault occurs, the secondary side of the mutual inductor is broken, and a secondary side broken line fault alarm is sent out;
wherein, R2 is the equivalent resistance of the secondary coil of the transformer, R3 is the parallel grounding resistance, and R14 is the series resistance.
Further, the controllable switch is a signal relay or a controllable MOS tube.
Correspondingly, a second aspect of the embodiments of the present invention provides a method for detecting a transformer of a relay protection device of a power system, in which a collecting circuit of the relay protection device of the power system, which is composed of a voltage transformer or a current transformer, a parallel ground resistor, a second-order low-pass anti-aliasing filter, and an analog-to-digital conversion chip ADC, is used to collect voltage or current; the voltage signal or the current signal is input through the primary side of the mutual inductor, the secondary side of the mutual inductor, the parallel grounding resistor, the second-order low-pass anti-aliasing filter and the analog-to-digital conversion chip ADC are sequentially connected to complete the acquisition of the voltage signal or the current signal, and the voltage signal data or the current signal data are transmitted to a main processor CPU for monitoring and data processing;
a mutual inductor secondary side disconnection detection component is added in an acquisition circuit of the relay protection device of the power system, is a series branch circuit connected with the parallel ground resistors in series and comprises a controllable switch; when the analog-to-digital conversion chip ADC acquires a normal voltage signal or current signal, the main processor CPU controls the controllable switch to be switched off, and the acquired voltage signal or current signal is not influenced by the secondary side disconnection detection component of the mutual inductor; and when the voltage signal value acquired by the analog-to-digital conversion chip ADC is 0, the main processor CPU controls the controllable switch to be closed, and judges whether the secondary side of the transformer is disconnected or not according to the voltage signal value acquired at the moment.
Further, the mutual inductor secondary side disconnection detection assembly further comprises a series resistor and a direct current reference voltage VCC, and the controllable switch, the series resistor and the direct current reference voltage VCC are connected to form a series branch.
Further, when the voltage signal value acquired by the analog-to-digital conversion chip ADC is 0, the main processor CPU controls the controllable switch to be closed and judges;
if the value of the collected voltage signal is equal to the value of the collected voltage signal
When the voltage value is equal to the voltage value, the secondary side of the transformer is not broken
When the fault occurs, the secondary side of the mutual inductor is broken, and a secondary side broken line fault alarm is sent out;
wherein, R2 is the equivalent resistance of the secondary coil of the transformer, R3 is the parallel grounding resistance, and R14 is the series resistance.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
the series branch is added on the secondary side of the transformer, when the voltage collected by the main processor CPU is zero, the controllable switch in the series branch is controlled to be closed, and whether the secondary side of the transformer is broken or not is judged by judging the voltage value collected by the main processor CPU.
Drawings
Fig. 1 is a schematic diagram of an acquisition circuit of a relay protection device of a power system according to an embodiment of the present invention.
Reference numerals:
1. the transformer comprises a transformer 2, a transformer secondary coil equivalent resistor 3, a parallel grounding resistor 4, a first filter resistor 5, a first filter resistor 6, a second filter resistor 7, a second filter resistor 8, a third filter resistor 9, a fourth filter resistor 10, an analog-to-digital conversion chip ADC 11, a first disconnection position 12, a second disconnection position 13, a controllable switch 14 and a series resistor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic diagram of an acquisition circuit of a relay protection device of a power system according to an embodiment of the present invention.
Referring to fig. 1, a first aspect of an embodiment of the present invention provides an acquisition circuit for a relay protection device of a power system, including: the transformer comprises a voltage transformer 1 or a current transformer 1, a parallel ground resistor 3, a second-order low-pass anti-aliasing filter and an analog-to-digital conversion chip ADC 10; a voltage signal or a current signal is input through the primary side of the mutual inductor 1, the secondary side of the mutual inductor 1, the parallel ground resistor 3, the second-order low-pass anti-aliasing filter and the analog-to-digital conversion chip ADC10 are sequentially connected to complete the acquisition of the voltage signal or the current signal, and the voltage signal data or the current signal data are transmitted to a main processor CPU for monitoring and data processing; further comprising: the line break detection component 2 on the side of the mutual inductor, the line break detection component 2 on the side of the mutual inductor is a series branch circuit connected in series with the parallel ground resistor 3, and include a controllable switch 13; when the analog-to-digital conversion chip ADC10 acquires a normal voltage signal or a normal current signal, the main processor CPU controls the controllable switch 13 to be switched off, so that the acquired signal is not influenced by the secondary side disconnection detection assembly 2 of the mutual inductor; if the voltage collected by the analog-to-digital conversion chip ADC10 is 0, the main processor CPU controls the controllable switch 13 to be closed, and judges whether the possible disconnection position I11 and the possible disconnection position 12 on the secondary side of the transformer 1 are disconnected according to the collected voltage signal value.
Specifically, the secondary side disconnection detecting component 2 of the transformer further includes a series resistor 14 and a dc reference voltage VCC, and the controllable switch 13, the series resistor 14 and the dc reference voltage VCC are connected to form a series branch.
Further, the second-order low-pass anti-aliasing filter comprises a first filter resistor 4, a second filter resistor 6, a third filter resistor 8, a fourth filter resistor 9, a first filter capacitor 5 and a second filter capacitor 7; the first filter resistor 4 is connected with the second filter resistor 6 in series, the first filter resistor 4 is connected with one end of the secondary side of the mutual inductor 1, and the second filter resistor 6 is connected with one input end of the analog-to-digital conversion chip ADC 10; the third filter resistor 8 is connected with the fourth filter resistor 9 in series, the third filter resistor 8 is connected with the other end of the secondary side of the mutual inductor 1, and the fourth filter resistor 9 is connected with the other input end of the analog-to-digital conversion chip ADC 10; two ends of the first filter capacitor 5 are respectively connected with the connection point of the first filter resistor 4 and the second filter resistor 6 and the connection point of the third filter resistor 8 and the fourth filter resistor 9; the second filter capacitor 7 is connected in parallel to the input terminal of the analog-to-digital conversion chip ADC 10.
Further, when the voltage signal value collected by the analog-to-digital conversion chip ADC10 is 0, the main processor CPU controls the controllable switch 13 to close, and performs the determination.
If the value of the collected voltage signal is equal to
And the time is long, the secondary side of the mutual inductor 1 is not broken. Wherein, R2 is the equivalent resistor 2 of the secondary side coil of the mutual inductor 1, R3 is the parallel grounding resistor 3, and R14 is the series resistor 14.
When the value of the collected voltage signal is equal to
And (4) when the secondary side of the mutual inductor 1 is broken, sending out a secondary side broken line fault alarm.
In addition, the controllable switch 13 is a signal relay or a controllable MOS transistor.
Correspondingly, a second aspect of the embodiment of the invention provides a method for detecting a transformer 1 of a relay protection device of a power system, which is characterized in that a collecting circuit of the relay protection device of the power system, which is composed of a voltage transformer 1 or a current transformer 1, a parallel ground resistor 3, a second-order low-pass anti-aliasing filter and an analog-to-digital conversion chip ADC10, is adopted to collect voltage or current; wherein, a voltage signal or a current signal is input through the primary side of the mutual inductor 1, the secondary side of the mutual inductor 1, the parallel ground resistor 3, the second-order low-pass anti-aliasing filter and the analog-to-digital conversion chip ADC10 are sequentially connected to finish the acquisition of the voltage signal or the current signal, and the voltage signal data or the current signal data are transmitted to a main processor CPU for monitoring and data processing; a mutual inductor secondary side disconnection detection component 2 is added in an acquisition circuit of a relay protection device of a power system, the mutual inductor secondary side disconnection detection component 2 is a series branch which is connected with a parallel ground resistor 3 in series and comprises a controllable switch 13; when the analog-to-digital conversion chip ADC10 acquires a normal voltage signal or current signal, the main processor CPU controls the controllable switch 13 to be switched off, so that the acquired voltage signal or current signal is not influenced by the secondary side disconnection detection component 2 of the transformer; when the voltage signal value acquired by the analog-to-digital conversion chip ADC10 is 0, the main processor CPU controls the controllable switch 13 to be closed, and determines whether the possible disconnection position one 11 and the disconnection position 12 on the secondary side of the transformer 1 are disconnected according to the voltage signal value acquired at this time.
Specifically, the secondary side disconnection detecting component 2 of the transformer further includes a series resistor and a dc reference voltage VCC, and the controllable switch 13, the series resistor and the dc reference voltage VCC are connected to form a series branch.
Further, when the voltage signal value collected by the analog-to-digital conversion chip ADC10 is 0, the main processor CPU controls the controllable switch 13 to close, and performs the determination.
If the value of the collected voltage signal is equal to
When the voltage value is equal to the voltage value, the secondary side of the transformer 1 is not broken
When the fault occurs, the secondary side of the mutual inductor 1 is broken, and a secondary side broken line fault alarm is sent out; wherein, R2 is the equivalent resistance 2 of the secondary side coil of the mutual inductor 1, R3 is the parallel connection ground resistance 3, and R14 is the series resistance 14.
The embodiment of the invention aims to protect an acquisition circuit of a relay protection device of a power system, which comprises: the device comprises a voltage transformer or a current transformer, a parallel grounding resistor, a second-order low-pass anti-aliasing filter and an analog-to-digital conversion chip ADC; a voltage signal or a current signal is input through the primary side of the mutual inductor, the secondary side of the mutual inductor, the parallel grounding resistor, the second-order low-pass anti-aliasing filter and the analog-to-digital conversion chip ADC are sequentially connected to complete the acquisition of the voltage signal or the current signal, and the voltage signal data or the current signal data are transmitted to a main processor CPU for monitoring and data processing; further comprising: the secondary side broken line detection component of the mutual inductor is a series branch circuit connected in series with a parallel ground resistor and comprises a controllable switch; when the analog-to-digital conversion chip ADC acquires a normal voltage signal or a normal current signal, the main processor CPU controls the controllable switch to be switched off, so that the acquired signal is not influenced by the secondary side broken line detection assembly of the mutual inductor; if the voltage acquired by the analog-to-digital conversion chip ADC is 0, the main processor CPU controls the controllable switch to be closed, and whether the secondary side of the transformer is disconnected or not is judged according to the voltage signal value acquired at the moment. The method for detecting the mutual inductor of the relay protection device of the power system is also protected. The technical scheme has the following effects:
the series branch is added on the secondary side of the transformer, when the voltage collected by the main processor CPU is zero, the controllable switch in the series branch is controlled to be closed, and whether the secondary side of the transformer is broken or not is judged by judging the voltage value collected by the main processor CPU.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (8)
1. A power system relay protection device acquisition circuit comprises: the device comprises a voltage transformer or a current transformer, a parallel grounding resistor, a second-order low-pass anti-aliasing filter and an analog-to-digital conversion chip ADC;
a voltage signal or a current signal is input through the primary side of the mutual inductor, the secondary side of the mutual inductor, the parallel grounding resistor, the second-order low-pass anti-aliasing filter and the analog-to-digital conversion chip ADC are sequentially connected to complete the acquisition of the voltage signal or the current signal, and the voltage signal data or the current signal data are transmitted to a main processor CPU for monitoring and data processing;
it is characterized by also comprising: the secondary side broken line detection component of the mutual inductor is a series branch circuit which is connected with the parallel ground resistor in series and comprises a controllable switch; when the analog-to-digital conversion chip ADC acquires the normal voltage signal or the normal current signal, the main processor CPU controls the controllable switch to be switched off, so that the acquired signal is not influenced by the secondary side disconnection detection assembly of the mutual inductor; and if the voltage acquired by the analog-to-digital conversion chip ADC is 0, the main processor CPU controls the controllable switch to be closed, and judges whether the secondary side of the transformer is disconnected according to the voltage signal value acquired at the moment.
2. The acquisition circuit of the power system relay protection device according to claim 1,
the mutual inductor secondary side broken line detection assembly further comprises a series resistor and a direct current reference voltage VCC, and the controllable switch, the series resistor and the direct current reference voltage VCC are connected to form a series branch.
3. The acquisition circuit of the power system relay protection device according to claim 2,
the second-order low-pass anti-aliasing filter comprises a first filter resistor, a second filter resistor, a third filter resistor, a fourth filter resistor, a first filter capacitor and a second filter capacitor;
the first filter resistor is connected with the second filter resistor in series, the first filter resistor is connected with one end of the secondary side of the mutual inductor, and the second filter resistor is connected with one input end of the analog-to-digital conversion chip ADC; the third filter resistor is connected with the fourth filter resistor in series, the third filter resistor is connected with the other end of the secondary side of the mutual inductor, and the fourth filter resistor is connected with the other input end of the analog-to-digital conversion chip ADC; two ends of the first filter capacitor are respectively connected to the connection point of the first filter resistor and the second filter resistor and the connection point of the third filter resistor and the fourth filter resistor; the second filter capacitor is connected in parallel to the input end of the analog-to-digital conversion chip ADC.
4. The acquisition circuit of the power system relay protection device according to claim 2,
when the voltage signal value acquired by the analog-to-digital conversion chip ADC is 0, the main processor CPU controls the controllable switch to be closed and judges;
if the value of the collected voltage signal is equal to the value of the collected voltage signal
When the current transformer is in a normal state, indicating that the secondary side of the transformer is not broken;
when the value of the collected voltage signal is equal to
When the fault occurs, the secondary side of the mutual inductor is broken, and a secondary side broken line fault alarm is sent out;
wherein, R2 is the equivalent resistance of the secondary coil of the transformer, R3 is the parallel grounding resistance, and R14 is the series resistance.
5. The acquisition circuit of the power system relay protection device according to any one of claims 2 to 4,
the controllable switch is a signal relay or a controllable MOS tube.
6. A mutual inductor detection method of a relay protection device of a power system adopts a collecting circuit of the relay protection device of the power system, which is composed of a voltage mutual inductor or a current mutual inductor, a parallel grounding resistor, a second-order low-pass anti-aliasing filter and an analog-to-digital conversion chip ADC, to collect voltage or current; the voltage signal or the current signal is input through the primary side of the mutual inductor, the secondary side of the mutual inductor, the parallel grounding resistor, the second-order low-pass anti-aliasing filter and the analog-to-digital conversion chip ADC are sequentially connected to complete the acquisition of the voltage signal or the current signal, and the voltage signal data or the current signal data are transmitted to a main processor CPU for monitoring and data processing;
the system is characterized in that a mutual inductor secondary side disconnection detection component is added in an acquisition circuit of a relay protection device of the power system, is a series branch circuit connected with the parallel ground resistors in series and comprises a controllable switch; when the analog-to-digital conversion chip ADC acquires a normal voltage signal or current signal, the main processor CPU controls the controllable switch to be switched off, and the acquired voltage signal or current signal is not influenced by the secondary side disconnection detection component of the mutual inductor; and when the voltage signal value acquired by the analog-to-digital conversion chip ADC is 0, the main processor CPU controls the controllable switch to be closed, and judges whether the secondary side of the transformer is disconnected or not according to the voltage signal value acquired at the moment.
7. The method for detecting a transformer of a relay protection device in a power system according to claim 6,
the mutual inductor secondary side broken line detection assembly further comprises a series resistor and a direct current reference voltage VCC, and the controllable switch, the series resistor and the direct current reference voltage VCC are connected to form a series branch.
8. The method for detecting mutual inductor of power system relay protection device according to claim 6,
when the voltage signal value acquired by the analog-to-digital conversion chip ADC is 0, the main processor CPU controls the controllable switch to be closed and judges;
if the value of the collected voltage signal is equal to the value of the collected voltage signal
When the voltage value is equal to the voltage value, the secondary side of the transformer is not broken
When the fault occurs, the secondary side of the mutual inductor is broken, and a secondary side broken line fault alarm is sent out;
wherein, R2 is the equivalent resistance of the secondary coil of the transformer, R3 is the parallel grounding resistance, and R14 is the series resistance.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112946552A (en) * | 2021-01-29 | 2021-06-11 | 许继集团有限公司 | Method and device for detecting secondary side disconnection of current transformer |
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| CN207601292U (en) * | 2017-12-28 | 2018-07-10 | 浙江阿海珐电气有限公司 | A kind of abnormal detector of mutual inductor |
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| CN204347169U (en) * | 2013-12-17 | 2015-05-20 | 重庆川仪自动化股份有限公司 | A kind of break detection circuit and temperature collection circuit |
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Application publication date: 20201204 |
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