CN114034994A - Insulation monitoring system and method for power utilization system of transformer substation - Google Patents
Insulation monitoring system and method for power utilization system of transformer substation Download PDFInfo
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- CN114034994A CN114034994A CN202111306208.2A CN202111306208A CN114034994A CN 114034994 A CN114034994 A CN 114034994A CN 202111306208 A CN202111306208 A CN 202111306208A CN 114034994 A CN114034994 A CN 114034994A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 48
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- 230000009471 action Effects 0.000 claims abstract description 7
- 230000005284 excitation Effects 0.000 claims description 85
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Abstract
An insulation monitoring system and method for a substation power utilization system are provided, the system comprises: the system comprises a plurality of detection nodes, a cloud server and a management terminal; the detection node comprises: the system comprises a direct current leakage detection module, an execution module and a wireless network module; the direct current leakage detection module is sleeved on a detected line and used for collecting leakage current and calculating a leakage current value; the execution module is used for executing a tripping action when the leakage current value reaches a threshold value or maintaining a closing state, and feeding back the tripping/closing state to the direct current leakage detection module; the wireless network module is used for sending the current leakage value and the tripping/closing state to the cloud server; the cloud server is used for providing an access interface for the management terminal. The invention improves the reliability of detection and communication functions and realizes the quick identification and early warning of insulation monitoring.
Description
Technical Field
The invention belongs to the field of leakage current detection and protection, and particularly relates to an insulation monitoring system and method for a substation power utilization system.
Background
The leakage current is a part with a non-zero current vector sum, generally caused by slow factors such as insulation aging and the like, causes the insulation resistance between the phase line and the equipment shell to be reduced, forms tiny residual current, and finally causes fire due to local heating.
The insulation of the substation power utilization system has a problem, leakage current can be generated, the leakage current can not only threaten operators to a certain extent, but also damage equipment, cause accidents such as electrical fire and the like, and serious potential safety hazards exist. The traditional leakage protector depends on an alternating magnetic field generated by alternating current leakage current, for a direct current system, the leakage current cannot generate the alternating magnetic field, the traditional protection device cannot realize protection, and alternating current and direct current hybrid leakage protection can solve the problem, but the technical difficulty is higher and the technical problem is monopolized abroad, so that research and development of a key technology and a core component of the high-reliability and low-cost alternating current and direct current leakage protection are urgently needed.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide an insulation monitoring system and method for a substation power utilization system, which take B-type residual current detection protection as a breakthrough, develop an intelligent switch and a detection protection device of the substation power utilization system, and simultaneously build an online monitoring system with the functions of real-time monitoring, remote alarming and the like by combining the networking communication technology.
The invention adopts the following technical scheme. The first aspect of the present invention provides an insulation monitoring system for an electric system of a substation, including: the system comprises a plurality of detection nodes, a cloud server and a management terminal;
the detection node comprises: the system comprises a direct current leakage detection module, an execution module and a wireless network module;
the direct current leakage detection module is sleeved on a detected line and used for collecting leakage current and calculating a leakage current value;
the execution module is used for executing a tripping action when the leakage current value reaches a threshold value or maintaining a closing state, and feeding back the tripping/closing state to the direct current leakage detection module;
the wireless network module is used for sending the current leakage value and the tripping/closing state to the cloud server;
the cloud server is used for providing an access interface for the management terminal.
Preferably, the dc leakage detecting module includes: the device comprises an annular magnetic core, an excitation winding, an excitation source, a detection unit, a core processing unit and a first power supply unit;
the annular magnetic core is sleeved on a tested circuit, the excitation winding is wound on the annular magnetic core, the excitation source is connected with the excitation winding, and the detection unit is respectively connected with the excitation winding, the excitation source and the core processing unit.
Preferably, the excitation source inputs an excitation voltage signal to the excitation winding, expressed in the following formula,
in the formula:
Uewhich is representative of the excitation voltage signal, is,
u denotes the excitation voltage signal amplitude,
t represents the period of the excitation voltage signal,
Preferably, the detection unit is used for detecting excitation current on the excitation winding and converting the excitation current into a signal which can be identified by the core processing unit, the core processing unit calculates to obtain a leakage current value, the leakage current value is sent to a base station to which the node belongs through the wireless network module, and the base station sends the leakage current value to a cloud server serving as an upper computer.
Preferably, the first power supply unit takes power from the front end of the incoming line end of the node, and is used for supplying power to the excitation source detection unit and the core processing unit so as not to cut off power after the execution module trips.
Preferably, the execution module comprises: the circuit breaker comprises a circuit breaker, a tripping control unit, a circuit breaker state monitoring unit and a second power supply unit.
Preferably, the core processing unit compares the calculated leakage current value with a threshold value, and sends the comparison result to the trip control unit of the execution module, if the leakage current value is smaller than the threshold value, the trip control unit does not act, and maintains the closing state of the circuit breaker, and if the leakage current value is not smaller than the threshold value, the trip control unit drives the circuit breaker to trip.
Preferably, the circuit breaker state monitoring unit is connected with a core processing unit of the direct current leakage detection module and used for feeding back the state of the circuit breaker in real time, namely, the circuit breaker is in a tripping state or a closing state and is fed back to the core processing unit in real time, the core processing unit sends the state of the circuit breaker to an upper computer to which the node belongs through the wireless network module, and the upper computer sends the state of the circuit breaker to the cloud server.
The insulation monitoring system of the substation power utilization system according to claim 7, characterized in that:
the wireless network module comprises a 433MHz LoRa wireless unit, the core processing unit of the direct current leakage detection module sends the calculated leakage current value and the breaker state to the base station through a LoRa wireless network, and the base station sends the leakage current value and the breaker state to the cloud server through a 4G wireless network.
Preferably, the second power supply unit is used for supplying power to the tripping control unit and the circuit breaker state monitoring unit, and cutting off the power supply after tripping to protect the electronic device from being damaged.
A second aspect of the invention provides an insulation monitoring method for an electrical system for a substation, operating on an insulation monitoring system as claimed in claims 1 to 10, comprising the steps of:
step 1, sleeving a direct current leakage detection module on a detected circuit, collecting leakage current and calculating a leakage current value;
step 2, on the basis of the step 1, the execution module executes a tripping action when the leakage current value reaches a threshold value or maintains a closing state, and feeds the tripping/closing state back to the direct current leakage detection module; if the closing state is maintained, returning to the step 1,
step 3, the direct current leakage detection module sends a leakage current value and a tripping/closing state to a cloud server through the wireless network module;
and 4, the cloud server provides the leakage current value and the tripping/closing state to the management terminal through the access interface.
Preferably, in step 1, the excitation source of the dc leakage detecting module inputs an excitation voltage signal to the excitation winding wound on the toroidal core, which is expressed by the following formula,
in the formula:
Uewhich is representative of the excitation voltage signal, is,
u denotes the excitation voltage signal amplitude,
t represents the period of the excitation voltage signal,
The invention has the beneficial effects that compared with the prior art, the insulation monitoring system and the insulation monitoring method for the power utilization system of the transformer substation are provided, the B-type residual current detection protection is taken as a breakthrough, the intelligent switch and the detection protection device of the power utilization system of the transformer substation are developed, and meanwhile, the online monitoring system with the functions of real-time monitoring, remote alarming and the like is built by combining the networking communication technology. The reliability of detection and communication functions is improved, and quick identification and early warning of insulation monitoring are achieved.
Drawings
Fig. 1 is a flowchart of an insulation monitoring method for an electric system of a substation provided by the present invention;
FIG. 2 is a schematic diagram of a detection of a DC leakage current fluxgate sensor;
FIG. 3 is a schematic diagram of the excitation voltage and excitation current waveforms without leakage current;
FIG. 4 is a schematic diagram of the waveforms of the excitation voltage and the excitation current with the forward leakage current;
FIG. 5 is a schematic diagram of an electrical leakage protection detection and execution topology;
FIG. 6 is a diagram of the internal functional components of the electrical leakage detection and execution module;
fig. 7 is a schematic diagram of a trip control unit logic topology;
fig. 8 is a logic diagram of LORA networking design.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
As shown in fig. 1 to 8, the present invention provides an insulation monitoring system for an electric system of a substation, including: the system comprises a plurality of detection nodes, a cloud server and a management terminal. The detection node comprises: the system comprises a direct current electric leakage detection module, an execution module and a wireless network module; the direct current leakage detection module is sleeved on a detected line and used for collecting leakage current and calculating a leakage current value; the execution module is used for executing tripping action when the leakage current value reaches above a threshold value, otherwise, maintaining a closing state, and feeding back the tripping/closing state to the direct current leakage detection module; the wireless network module is used for sending the current leakage value and the tripping/closing state to the cloud server; the cloud server is used for providing an access interface for the management terminal.
In a further preferred embodiment of the present invention, the dc leakage detecting module is sleeved on the line to be detected, and is configured to collect the leakage current and calculate the leakage current value, and includes: the device comprises an annular magnetic core, an excitation source, an excitation winding, a detection unit, a core processing unit and a first power supply unit.
The annular magnetic core is sleeved on a tested circuit, the excitation winding is wound on the annular magnetic core, the excitation source is connected with the excitation winding, and the detection unit is respectively connected with the excitation winding, the excitation source and the core processing unit.
The excitation source inputs an excitation voltage signal to the excitation winding, expressed by the following formula (1),
in the formula:
Uewhich is representative of the excitation voltage signal, is,
u denotes the excitation voltage signal amplitude,
t represents the period of the excitation voltage signal,
In a further preferred embodiment of the invention, the excitation voltage signal period T <1 ms.
The excitation winding and the detection winding are wound on the magnetic core at the same time, a current I is arranged in the direction perpendicular to the magnetic core, an annular magnetic field Ho can be generated by the current I, and further influences B in the magnetic core, the change of the magnetic field in the magnetic core can be shown through a voltage signal of the detection coil, the second harmonic which has the largest influence on the magnetic field in the magnetic core in all harmonics contained in the signal is utilized, and the voltage signal except the second harmonic on the detection coil can be filtered. The positive and negative of the second harmonic voltage obtained after filtering can be used as a reference of the direction of the current to be detected, and the amplitude of the second harmonic voltage is approximately proportional to the current to be detected.
The detection unit is used for detecting the excitation current on the excitation winding and converting the excitation current into a signal which can be identified by the core processing unit, the core processing unit calculates to obtain a leakage current value, the leakage current value is sent to a base station to which the node belongs through the wireless network module, and the base station sends the leakage current value to a cloud server serving as an upper computer.
Fig. 3 is a waveform diagram of no leakage current. In the positive half cycle, the positive voltage from the square wave excitation source causes the magnetic core to be positively magnetized. When the magnetic core is saturated in the positive direction, the intensity of the forward excitation current sent by the magnetic core reaches a threshold value, the detection control module is triggered to send out a turnover signal, and the square wave signal enters a negative half period. At the moment, the magnetic core is magnetized reversely, when the magnetic core is saturated, the reverse excitation current triggers the turnover signal again, and the cycle is finished. Because the input and output currents are symmetrical at the moment, and the magnetic core is completely magnetized by the square wave signals, the waveforms of the excitation currents are symmetrical.
Fig. 4 is a schematic diagram of waveforms of an excitation voltage and an excitation current with a forward leakage current, when the forward leakage current exists in the current, the magnetic core is saturated in advance due to an additional magnetization effect of the leakage current, and the waveform of the excitation current is shifted down.
In a further preferred embodiment of the present invention, the first power supply unit obtains power from the front end of the incoming line end of the node, and is configured to supply power to the excitation source detection unit and the core processing unit, so as to ensure that the circuit breaker of the execution module is not powered off after tripping, and implement an intelligent real-time online function. Specifically, the alternating current is rectified, filtered and then subjected to AC/DC conversion, and is converted into stable low-voltage direct current to be supplied to a core processing unit, a detection unit and a wireless network module, namely an LORA wireless unit.
The execution module comprises: the circuit breaker comprises a circuit breaker, a tripping control unit, a circuit breaker state monitoring unit and a second power supply unit.
The core processing unit compares the calculated leakage current value with a threshold value, sends a comparison result to a tripping control unit of the execution module, if the leakage current value is smaller than the threshold value, the tripping control unit does not act, the closing state of the circuit breaker is maintained, and if the leakage current value is not smaller than the threshold value, the tripping control unit drives the circuit breaker to trip.
The circuit breaker state monitoring unit is connected with the core processing unit of the direct current electric leakage detection module and used for feeding back the state of the circuit breaker in real time, namely feeding back the state of the circuit breaker in a tripping state or a closing state to the core processing unit in real time, the core processing unit sends the state of the circuit breaker to an upper computer to which the node belongs through the wireless network module, and the upper computer sends the state of the circuit breaker to the cloud server.
In a further preferred embodiment, the wireless network module comprises a 433MHz LoRa wireless unit, the core processing unit of the dc leakage detection module sends the calculated leakage current value and the breaker state to the base station through the LoRa wireless network, and the base station sends the leakage current value and the breaker state to the cloud server through the 4G wireless network.
The second power supply unit obtains electricity at the rear end of the wire outlet end of the node and is used for supplying power to the tripping control unit and the circuit breaker state monitoring unit, and the power supply is cut off after tripping to protect the electronic device from being damaged.
The core processing unit receives the excitation current collected by the detection unit, judges by using the excitation current waveform obtained by the detection unit, and further judges the direct current leakage condition according to the current waveform.
The loRa wireless unit is used for each detection node and the communication between the host computer, and each leakage protection switch is as a node, and inside 433MHz LORA wireless module that adopts customization agreement gives the basic station of certain limit with information transfer such as electric leakage data, circuit breaker divide-shut brake state, passes through the high in the clouds server on the 4G network by the basic station again, and the high in the clouds server provides cell-phone APP and PC and carries out the interface that visits.
The embodiment 2 of the invention provides an insulation monitoring method of an electric system of a transformer substation, which is operated on the insulation monitoring system and comprises the following steps:
step 1, sleeving a direct current leakage detection module on a detected circuit, collecting leakage current and calculating a leakage current value;
step 2, on the basis of the step 1, the execution module executes a tripping action when the leakage current value reaches a threshold value or maintains a closing state, and feeds the tripping/closing state back to the direct current leakage detection module; if the closing state is maintained, returning to the step 1,
step 3, the direct current leakage detection module sends a leakage current value and a tripping/closing state to a cloud server through the wireless network module;
and 4, the cloud server provides the leakage current value and the tripping/closing state to the management terminal through the access interface.
In a further preferred embodiment, in step 1, the excitation source of the dc leakage detection module inputs an excitation voltage signal to the excitation winding wound on the annular magnetic core, which is expressed by the following formula,
in the formula:
Uewhich is representative of the excitation voltage signal, is,
u denotes the excitation voltage signal amplitude,
t represents the period of the excitation voltage signal,
The invention has the beneficial effects that compared with the prior art, the insulation monitoring system and the insulation monitoring method for the power utilization system of the transformer substation are provided, the B-type residual current detection protection is taken as a breakthrough, the intelligent switch and the detection protection device of the power utilization system of the transformer substation are developed, and meanwhile, the online monitoring system with the functions of real-time monitoring, remote alarming and the like is built by combining the networking communication technology. The reliability of detection and communication functions is improved, and quick identification and early warning of insulation monitoring are achieved.
The present applicant has described and illustrated embodiments of the present invention in detail with reference to the accompanying drawings, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (12)
1. An insulation monitoring system of a substation power utilization system, comprising: the system comprises a plurality of detection nodes, a cloud server and a management terminal; it is characterized in that the preparation method is characterized in that,
the detection node comprises: the system comprises a direct current leakage detection module, an execution module and a wireless network module;
the direct current leakage detection module is sleeved on a detected line and used for collecting leakage current and calculating a leakage current value;
the execution module is used for executing a tripping action when the leakage current value reaches a threshold value or maintaining a closing state, and feeding back the tripping/closing state to the direct current leakage detection module;
the wireless network module is used for sending the current leakage value and the tripping/closing state to the cloud server;
the cloud server is used for providing an access interface for the management terminal.
2. The insulation monitoring system of the substation power utilization system according to claim 1, characterized in that:
the direct current electric leakage detection module includes: the device comprises an annular magnetic core, an excitation winding, an excitation source, a detection unit, a core processing unit and a first power supply unit;
the annular magnetic core is sleeved on a tested circuit, the excitation winding is wound on the annular magnetic core, the excitation source is connected with the excitation winding, and the detection unit is respectively connected with the excitation winding, the excitation source and the core processing unit.
3. The insulation monitoring system of the substation power utilization system according to claim 2, characterized in that:
the excitation source inputs an excitation voltage signal to the excitation winding, expressed by the following formula,
in the formula:
Uewhich is representative of the excitation voltage signal, is,
u denotes the excitation voltage signal amplitude,
t represents the period of the excitation voltage signal,
4. An insulation monitoring system of a substation power consumption system according to any of claims 1 to 3, characterized in that:
the detection unit is used for detecting the excitation current on the excitation winding and converting the excitation current into a signal which can be identified by the core processing unit, the core processing unit calculates to obtain a leakage current value, the leakage current value is sent to a base station to which the node belongs through the wireless network module, and the base station sends the leakage current value to a cloud server serving as an upper computer.
5. An insulation monitoring system of a substation power consumption system according to any of claims 1 to 3, characterized in that:
the first power supply unit obtains electricity at the front end of the wire inlet end of the node, is used for supplying power to the excitation source detection unit and the core processing unit and is used for not cutting off the power after the execution module trips.
6. An insulation monitoring system of a substation power consumption system according to any of claims 1 to 3, characterized in that:
the execution module comprises: the circuit breaker comprises a circuit breaker, a tripping control unit, a circuit breaker state monitoring unit and a second power supply unit.
7. The insulation monitoring system of the substation power utilization system according to claim 6, characterized in that:
the core processing unit compares the calculated leakage current value with a threshold value, sends a comparison result to a tripping control unit of the execution module, if the leakage current value is smaller than the threshold value, the tripping control unit does not act, the closing state of the circuit breaker is maintained, and if the leakage current value is not smaller than the threshold value, the tripping control unit drives the circuit breaker to trip.
8. The insulation monitoring system of the substation power utilization system according to claim 7, characterized in that:
the circuit breaker state monitoring unit is connected with the core processing unit of the direct current electric leakage detection module and used for feeding back the state of the circuit breaker in real time, namely feeding back the state of the circuit breaker in a tripping state or a closing state to the core processing unit in real time, the core processing unit sends the state of the circuit breaker to an upper computer to which the node belongs through the wireless network module, and the upper computer sends the state of the circuit breaker to the cloud server.
9. The insulation monitoring system of the substation power utilization system according to claim 7, characterized in that:
the wireless network module comprises a 433MHz LoRa wireless unit, a core processing unit of the direct current leakage detection module sends a calculated leakage current value and a calculated breaker state to a base station through a LoRa wireless network, and the base station sends the leakage current value and the breaker state to a cloud server through a 4G wireless network.
10. The insulation monitoring system of the substation power utilization system according to claim 7, characterized in that:
the second power supply unit gets electricity at the rear end of the wire outlet end of the node and is used for supplying power to the tripping control unit and the circuit breaker state monitoring unit, and the power supply is cut off after tripping to protect the electronic device from being damaged.
11. An insulation monitoring method of a substation power utilization system operating on the insulation monitoring system according to claims 1 to 10, characterized by comprising the steps of:
step 1, sleeving a direct current leakage detection module on a detected circuit, collecting leakage current and calculating a leakage current value;
step 2, on the basis of the step 1, the execution module executes a tripping action when the leakage current value reaches a threshold value or maintains a closing state, and feeds the tripping/closing state back to the direct current leakage detection module; if the closing state is maintained, returning to the step 1,
step 3, the direct current leakage detection module sends a leakage current value and a tripping/closing state to a cloud server through the wireless network module;
and 4, the cloud server provides the leakage current value and the tripping/closing state to the management terminal through the access interface.
12. The insulation monitoring method of the substation power utilization system according to claim 11, characterized in that:
in step 1, an excitation source of the direct current leakage detection module inputs an excitation voltage signal to an excitation winding wound on an annular magnetic core, and the excitation voltage signal is expressed by the following formula,
in the formula:
Uewhich is representative of the excitation voltage signal, is,
u denotes the excitation voltage signal amplitude,
t represents the period of the excitation voltage signal,
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2021
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