CN113721065A - Alternating current data acquisition device for station and acquisition method thereof - Google Patents
Alternating current data acquisition device for station and acquisition method thereof Download PDFInfo
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- CN113721065A CN113721065A CN202110986166.5A CN202110986166A CN113721065A CN 113721065 A CN113721065 A CN 113721065A CN 202110986166 A CN202110986166 A CN 202110986166A CN 113721065 A CN113721065 A CN 113721065A
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Abstract
The invention discloses a station AC current data acquisition device and an acquisition method thereof, comprising a residual current monitoring screen, wherein the input end of the residual current monitoring screen is electrically connected with a background control terminal through a data transmission line, the invention can timely master the internal current condition of a transformer substation by monitoring data such as neutral grounding point current at the low-voltage side of a transformer, total station residual current, feeder circuit residual current, environment temperature and the like in real time, simultaneously monitor the insulation state of a cable body by monitoring an important or long-distance feeder cable body or armoured current thereof, monitor the on-off signal or trip-off signal of a switch in real time, more comprehensively know the equipment operation condition of a low-voltage AC system, when the residual current exceeds the limit, the residual current terminal starts switch linkage control, cuts off a fault line in time and prevents the accident from expanding, is beneficial to practical application.
Description
Technical Field
The invention belongs to the field of current data acquisition, and particularly relates to a station alternating current data acquisition device and an acquisition method thereof.
Background
The transformer substation is a place for converting voltage and current in a power system, receiving electric energy and distributing the electric energy, the transformer substation in a power plant is a boosting transformer substation, the boosting transformer substation has the function of boosting the electric energy generated by a generator and then feeding the electric energy to a high-voltage power grid, and in the existing life, the accident that an alternating current cable is on fire often happens inside the transformer substation, so that the low-voltage alternating current cable is mainly on fire for two reasons: the first is that when the cable has a metal short circuit fault, the protection circuit breaker has insufficient sensitivity and cannot jump off in a short time to cause the cable to catch fire; secondly, when the cable is damaged in insulation and creepage and arcing occurs, the arc channel has larger resistance and belongs to the high-resistance grounding condition, the circuit breaker for protection cannot be tripped off, but the temperature of the arc channel is very high at the moment, so that the cable is ignited.
However, the current data of the cable inside the transformer substation is collected in real time by a station alternating current data collecting device which is lacked in the prior art, so that the current of the cable cannot be monitored in real time, corresponding safety measures are taken in time, and the situation that the cable is on fire is avoided.
The invention content is as follows:
the present invention is directed to a station ac current data collecting device and a collecting method thereof to solve the above problems, and to solve the problems mentioned in the background art.
In order to solve the above problems, the present invention provides a technical solution:
the alternating current data acquisition device for the station comprises a residual current monitoring screen, wherein the input end of the residual current monitoring screen is electrically connected with a background control terminal through a data transmission line, and the input end of the residual current monitoring screen is also electrically connected with a cable insulation monitoring host, a temperature and humidity sensor, a switch monitoring module and a residual current terminal through an R485 bus;
the residual current monitoring screen is used for checking and setting local data, displaying the residual current condition of each monitoring point on site, and uploading the data to the background control terminal through the residual current monitoring screen;
the background control terminal is used for providing a control platform for an operator and transmitting a control instruction of the operator;
the cable insulation monitoring host is used for acquiring data of each slave machine, performing vector synthesis on current data of the slave machines at two ends of the cable, and uploading the processed current data to the residual current monitoring screen;
the temperature and humidity sensor is used for monitoring the environmental temperature of the transformer substation in real time and uploading monitoring data to the residual current monitoring screen in real time;
the switch monitoring module is used for monitoring a switching-on signal or a tripping signal of the switch in real time;
and the residual current terminal is used for monitoring and managing the residual current of the feeder line loop and the environment temperature and humidity in real time, and is also used for starting switch linkage control and cutting off a fault line.
Preferably, the output end of the cable insulation monitoring host is electrically connected with a cable insulation monitoring slave 1 and a cable insulation monitoring slave 2 respectively;
the cable insulation monitoring slave 1 and the cable insulation monitoring slave 2 are used for acquiring parameters such as voltage, current and phase angle at one end of a cable, simultaneously used for issuing control and temperature measurement, and uploading data to the cable insulation monitoring host.
Preferably, the output end of the cable insulation monitoring slave 1 is electrically connected with a residual current transformer CT1 and a temperature probe 1 respectively, and the output end of the cable insulation monitoring slave 2 is electrically connected with a residual current transformer CT2 and a temperature probe 2 respectively;
the residual current transformer CT1 and the residual current transformer CT2 are used for measuring alternating current of each cable insulation monitoring slave and output alternating current signals by utilizing the electromagnetic mutual inductance principle;
and the temperature measuring probes 1 and 2 are used for detecting the temperature of the corresponding cable end and transmitting the temperature data to the corresponding cable insulation monitoring slave machine for processing.
Preferably, the output end of the residual current terminal is respectively and electrically connected with a residual current transformer CT3 and a temperature probe 3;
the residual current transformer CT3 is used for measuring the alternating current of the residual current terminal and the output alternating current signal by utilizing the principle of electromagnetic mutual inductance;
and the temperature measuring probe 3 is used for detecting the temperature of the cable end of the residual current terminal and transmitting the temperature data to the residual current terminal for processing.
Preferably, the output end of the residual current terminal is also electrically connected with a leakage detector;
and the electric leakage detector is used for monitoring and managing the residual current of the feeder line loop, the temperature of the lead and other fire hazard parameters in real time.
A collection method of a station alternating current data collection device comprises the following steps:
s1, before the transformer substation is put into use, firstly, a transformer substation system needs to be transformed, meanwhile, the grounding condition of the transformer substation needs to be checked, the grounding system needs to meet the condition that the zero line in the alternating current system is not repeatedly grounded except the neutral point grounding of the transformer substation low-voltage side or the zero bus grounding of the central distribution panel, and then the transformer substation can be put into use;
s2, monitoring the total residual current of the low-voltage alternating-current power supply, the residual current of the feeder non-zero-sharing loop, the residual current of the feeder zero-sharing loop, the cable insulation and the armor layer current of the cable insulation in real time through the residual current terminal, and monitoring and collecting the residual current value of the whole station in real time;
and S3, monitoring and acquiring the cable and the armored current in real time through the cable insulation monitoring host and the cable insulation monitoring slave.
Preferably, in the step S1, the substation system needs to be modified into a TN-S system, a TN-C system, and a TN-C-S system.
Preferably, the specific operation steps of monitoring the total station residual current value in real time in step S2 are as follows: the current of a neutral point is monitored through a residual current terminal at one point of a plurality of neutral points in the TN-S system, and then the neutral point currents are subjected to vector synthesis to obtain an actual total station residual current value.
Preferably, the specific operation steps of monitoring the cable and the sheath current in real time in step S3 are as follows: the method comprises the steps of additionally arranging residual current monitoring terminals at the head end and the tail end of the power long cable, calculating out the residual current power long cable head end and tail end grounding current monitoring equipment of the cable by a calculation vector combination method, and directly obtaining the grounding current of the cable armor layer by the calculation vector combination method.
The invention has the beneficial effects that: the invention can timely master the current condition in a transformer substation by monitoring data such as neutral grounding point current on the low-voltage side of a transformer, total station residual current, feeder line loop residual current, environment temperature and the like in real time, simultaneously monitor the insulation state of a cable body by monitoring an important or long-distance feeder line cable body or the armoured current thereof, record instantaneous current waveforms before and after the fault occurs at the same time of the fault occurrence, provide basis for analysis and processing of reasons after the fault occurs, can early warn possible fault hidden dangers in advance by continuously recording characteristic parameters of feeder line monitoring data, simultaneously monitor the on-off signal or trip-off signal of a switch in real time, more comprehensively know the equipment operation condition of a low-voltage alternating current system, and start switch linkage control by a residual current terminal when the residual current exceeds the limit, and timely cut off a fault line, preventing the accident from expanding and being beneficial to the practical application.
Description of the drawings:
for ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is a schematic diagram of a system for a station AC current data acquisition device according to the present invention;
FIG. 2 is a schematic diagram of residual current monitoring according to the present invention;
FIG. 3 is a schematic diagram of the residual current monitoring of the neutral point on the low-voltage side of the transformer according to the present invention;
fig. 4 is a schematic diagram of the cable and sheath current monitoring of the present invention.
The specific implementation mode is as follows:
as shown in fig. 1 to 4, the following technical solutions are adopted in the present embodiment:
example (b):
a station alternating current data acquisition device comprises a residual current monitoring screen, wherein the input end of the residual current monitoring screen is electrically connected with a background control terminal through a data transmission line, the input end of the residual current monitoring screen is also electrically connected with a cable insulation monitoring host, a temperature and humidity sensor, a switch monitoring module and a residual current terminal through an R485 bus, and the station alternating current data acquisition device is formed by the cable insulation monitoring host, the temperature and humidity sensor, the switch monitoring module, the residual current terminal, the background control terminal and the residual current monitoring screen;
the residual current monitoring screen is used for checking and setting local data, displaying the residual current condition of each monitoring point on site, and uploading the data to the background control terminal through the residual current monitoring screen;
the background control terminal is used for providing a control platform for an operator and transmitting a control instruction of the operator;
the cable insulation monitoring host is used for acquiring data of each slave machine, performing vector synthesis on current data of the slave machines at two ends of the cable, and uploading the processed current data to the residual current monitoring screen;
the temperature and humidity sensor is used for monitoring the environmental temperature of the transformer substation in real time and uploading monitoring data to the residual current monitoring screen in real time;
the switch monitoring module is used for monitoring a switching-on signal or a tripping signal of the switch in real time;
and the residual current terminal is used for monitoring and managing the residual current of the feeder line loop and the environment temperature and humidity in real time, and is also used for starting switch linkage control and cutting off a fault line.
The output end of the cable insulation monitoring host is respectively and electrically connected with a cable insulation monitoring slave 1 and a cable insulation monitoring slave 2;
the cable insulation monitoring slave 1 and the cable insulation monitoring slave 2 are used for acquiring parameters such as voltage, current and phase angle at one end of a cable, simultaneously used for issuing control and temperature measurement, and uploading data to the cable insulation monitoring host.
The output end of the cable insulation monitoring slave 1 is respectively and electrically connected with a residual current transformer CT1 and a temperature probe 1, and the output end of the cable insulation monitoring slave 2 is respectively and electrically connected with a residual current transformer CT2 and a temperature probe 2;
the residual current transformer CT1 and the residual current transformer CT2 are used for measuring alternating current of each cable insulation monitoring slave and output alternating current signals by utilizing the electromagnetic mutual inductance principle;
and the temperature measuring probes 1 and 2 are used for detecting the temperature of the corresponding cable end and transmitting the temperature data to the corresponding cable insulation monitoring slave machine for processing.
The output end of the residual current terminal is respectively and electrically connected with a residual current transformer CT3 and a temperature probe 3, the residual current transformer CT3 is used for better measuring the alternating current of the residual current terminal and outputting an alternating current signal, the measured data are better transmitted, the temperature probe 3 is used for better detecting the temperature of the cable end, and the temperature data are better transmitted, so that the normal operation of the whole system device is ensured;
the residual current transformer CT3 is used for measuring the alternating current of the residual current terminal and the output alternating current signal by utilizing the principle of electromagnetic mutual inductance;
and the temperature measuring probe 3 is used for detecting the temperature of the cable end of the residual current terminal and transmitting the temperature data to the residual current terminal for processing.
The output end of the residual current terminal is also electrically connected with a leakage detector, and the leakage detector is arranged, so that the circuit condition of the whole equipment can be better monitored, the potential safety hazard of the whole equipment is greatly reduced, and the actual application is facilitated;
and the electric leakage detector is used for monitoring and managing the residual current of the feeder line loop, the temperature of the lead and other fire hazard parameters in real time.
A collection method of a station alternating current data collection device comprises the following steps:
s1, before the transformer substation is put into use, firstly, a transformer substation system needs to be transformed, meanwhile, the grounding condition of the transformer substation needs to be checked, the grounding system needs to meet the condition that the zero line in the alternating current system is not repeatedly grounded except the neutral point grounding of the transformer substation low-voltage side or the zero bus grounding of the central distribution panel, and then the transformer substation can be put into use;
s2, monitoring the total residual current of the low-voltage alternating-current power supply, the residual current of the feeder non-zero-sharing loop, the residual current of the feeder zero-sharing loop, the cable insulation and the armor layer current of the cable insulation in real time through the residual current terminal, and monitoring and collecting the residual current value of the whole station in real time;
s3, the cable and the armored current are monitored and collected in real time through the cable insulation monitoring host and the cable insulation monitoring slave, the current data are collected through the alternating current data collection method, potential fault hazards which may exist can be early warned in advance, meanwhile, the on-off signal or the tripping signal of the switch is monitored in real time, the equipment running condition of the low-voltage alternating current system is more comprehensively known, when the residual current exceeds the limit, the residual current terminal starts switch linkage control, the fault line is timely cut off, and the accident expansion is prevented.
In the step S1, the substation system needs to be modified into a TN-S system, a TN-C system, and a TN-C-S system, which is more suitable for the ac current data acquisition device for the substation.
The specific operation steps of monitoring the total station residual current value in real time in step S2 are as follows: the current of the neutral point is monitored by the residual current terminal at the point-to-point ground of the neutral points in the TN-S system, and then the neutral point currents are subjected to vector synthesis to obtain an actual residual current value of the total station, so that the obtained current data volume can be better processed, the actual residual current value of the total station is obtained, and the actual calculation and early warning operation is facilitated.
The specific operation steps of monitoring the cable and the armoured current in real time in the step S3 are as follows: the method is characterized in that residual current monitoring terminals are additionally arranged at the first end and the last end of the power long cable, armored layer grounding current monitoring equipment is additionally arranged at the first end and the last end of the residual current power long cable, the cable grounding current monitoring equipment is calculated by a calculation vector combination method, the cable armored layer grounding current is directly obtained by the calculation vector combination method, the cable armored layer grounding current is conveniently and better calculated by the residual current monitoring terminals and the vector combination calculation method, and therefore the process of calculating through data acquisition is completed.
Specifically, the method comprises the following steps: before the transformer substation is put into use, firstly, a transformer substation system needs to be transformed into one of a TN-S system, a TN-C system and a TN-C-S system, meanwhile, the grounding condition of the transformer substation is checked, the grounding system is ensured to meet the condition that the zero line in an alternating current system is not repeatedly grounded except the neutral point grounding of a low-voltage side for the transformer substation or the zero bus grounding of a central distribution panel, and then the transformer substation can be put into use; in actual operation, the total residual current of the low-voltage alternating-current power supply, the residual current of the feeder non-zero-sharing loop, the residual current of the feeder zero-sharing loop, the cable insulation and the armor layer current of the cable insulation can be monitored in real time through the residual current terminal, the switch is started to carry out linkage control according to the real-time monitoring result, a fault line is cut off, and meanwhile, the residual current value of the whole station is monitored and collected in real time; then, the cable and the armor current are monitored and collected in real time through the cable insulation monitoring host and the cable insulation monitoring slave, the alternating current and the output alternating current signals of each cable insulation monitoring slave are measured by utilizing the electromagnetic mutual inductance principle through the residual current transformer CT1 and the residual current transformer CT2, the temperature of the corresponding cable end is detected through the temperature probe 1 and the temperature probe 2, the temperature data are transmitted to the corresponding cable insulation monitoring slave for processing, meanwhile, the residual current of a feeder line loop, the temperature of a lead and other fire hazard parameters are monitored and managed in real time through the leakage detector during detection, so that the real-time monitoring of the data of the neutral ground point current, the total station residual current, the residual current of the feeder line loop, the environmental temperature and the like on the low-voltage side of the transformer is completed, and the current condition in a transformer substation can be mastered in time, simultaneously through monitoring important or long distance feeder cable body or its armor electric current, realize the monitoring to cable body insulating state, and record the instantaneous current wave form around the trouble takes place when the trouble takes place, provide the basis for reason analysis and processing after the trouble takes place, and through the characteristic parameter of continuous recording feeder monitoring data, the hidden danger of trouble that can early warning probably exist in advance, the break-make signal or the trip signal of real-time supervision switch simultaneously, the equipment running condition of more comprehensive understanding low pressure alternating current system, when the residual current overlimit, residual current terminal starting switch coordinated control, in time cut off the fault line, prevent the accident from expanding, be favorable to practical application.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The alternating current data acquisition device for the station is characterized by comprising a residual current monitoring screen, wherein the input end of the residual current monitoring screen is electrically connected with a background control terminal through a data transmission line, and the input end of the residual current monitoring screen is also electrically connected with a cable insulation monitoring host, a temperature and humidity sensor, a switch monitoring module and a residual current terminal through an R485 bus;
the residual current monitoring screen is used for checking and setting local data, displaying the residual current condition of each monitoring point on site, and uploading the data to the background control terminal through the residual current monitoring screen;
the background control terminal is used for providing a control platform for an operator and transmitting a control instruction of the operator;
the cable insulation monitoring host is used for acquiring data of each slave machine, performing vector synthesis on current data of the slave machines at two ends of the cable, and uploading the processed current data to the residual current monitoring screen;
the temperature and humidity sensor is used for monitoring the environmental temperature of the transformer substation in real time and uploading monitoring data to the residual current monitoring screen in real time;
the switch monitoring module is used for monitoring a switching-on signal or a tripping signal of the switch in real time;
and the residual current terminal is used for monitoring and managing the residual current of the feeder line loop and the environment temperature and humidity in real time, and is also used for starting switch linkage control and cutting off a fault line.
2. The ac power current data acquisition device for the station according to claim 1, wherein the cable insulation monitoring slave 1 and the cable insulation monitoring slave 2 are electrically connected to the output end of the cable insulation monitoring master, respectively;
the cable insulation monitoring slave 1 and the cable insulation monitoring slave 2 are used for acquiring parameters such as voltage, current and phase angle at one end of a cable, simultaneously used for issuing control and temperature measurement, and uploading data to the cable insulation monitoring host.
3. The alternating current data acquisition device for the station as claimed in claim 2, wherein the output end of the cable insulation monitoring slave 1 is electrically connected with a residual current transformer CT1 and a temperature probe 1 respectively, and the output end of the cable insulation monitoring slave 2 is electrically connected with a residual current transformer CT2 and a temperature probe 2 respectively;
the residual current transformer CT1 and the residual current transformer CT2 are used for measuring alternating current of each cable insulation monitoring slave and output alternating current signals by utilizing the electromagnetic mutual inductance principle;
and the temperature measuring probes 1 and 2 are used for detecting the temperature of the corresponding cable end and transmitting the temperature data to the corresponding cable insulation monitoring slave machine for processing.
4. The alternating current data acquisition device for the station as claimed in claim 1, wherein the output end of the residual current terminal is electrically connected with a residual current transformer CT3 and a temperature probe 3 respectively;
the residual current transformer CT3 is used for measuring the alternating current of the residual current terminal and the output alternating current signal by utilizing the principle of electromagnetic mutual inductance;
and the temperature measuring probe 3 is used for detecting the temperature of the cable end of the residual current terminal and transmitting the temperature data to the residual current terminal for processing.
5. The ac power supply current data acquisition device of claim 1, wherein the output terminal of the residual current terminal is further electrically connected to a leakage detector;
and the electric leakage detector is used for monitoring and managing the residual current of the feeder line loop, the temperature of the lead and other fire hazard parameters in real time.
6. A collection method of a station alternating current electric current data collection apparatus according to any one of claims 1 to 5, comprising the steps of:
s1, before the transformer substation is put into use, firstly, a transformer substation system needs to be transformed, meanwhile, the grounding condition of the transformer substation needs to be checked, the grounding system needs to meet the condition that the zero line in the alternating current system is not repeatedly grounded except the neutral point grounding of the transformer substation low-voltage side or the zero bus grounding of the central distribution panel, and then the transformer substation can be put into use;
s2, monitoring the total residual current of the low-voltage alternating-current power supply, the residual current of the feeder non-zero-sharing loop, the residual current of the feeder zero-sharing loop, the cable insulation and the armor layer current of the cable insulation in real time through the residual current terminal, and monitoring and collecting the residual current value of the whole station in real time;
and S3, monitoring and acquiring the cable and the armored current in real time through the cable insulation monitoring host and the cable insulation monitoring slave.
7. The collection method of the AC power current data collection device for the station as claimed in claim 6, wherein in the step S1, the substation system is required to be modified into TN-S system, TN-C system and TN-C-S system.
8. The method for acquiring ac power current data of a station as claimed in claim 6, wherein the real-time monitoring of the residual current value of the whole station in step S2 includes the following steps: the current of a neutral point is monitored through a residual current terminal at one point of a plurality of neutral points in the TN-S system, and then the neutral point currents are subjected to vector synthesis to obtain an actual total station residual current value.
9. The method for acquiring the alternating current data acquisition device for the station as claimed in claim 6, wherein the specific operation steps for monitoring the cable and the sheath current in real time in the step S3 are as follows: the method comprises the steps of additionally arranging residual current monitoring terminals at the head end and the tail end of the power long cable, calculating out the residual current power long cable head end and tail end grounding current monitoring equipment of the cable by a calculation vector combination method, and directly obtaining the grounding current of the cable armor layer by the calculation vector combination method.
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| CN115436687A (en) * | 2022-08-31 | 2022-12-06 | 重庆泊津科技有限公司 | Method and system for synchronously synthesizing grounding current of transformer for station |
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