CN111366218A - Method for detecting faults of water cooling system - Google Patents
Method for detecting faults of water cooling system Download PDFInfo
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- CN111366218A CN111366218A CN202010320530.XA CN202010320530A CN111366218A CN 111366218 A CN111366218 A CN 111366218A CN 202010320530 A CN202010320530 A CN 202010320530A CN 111366218 A CN111366218 A CN 111366218A
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- flow sensor
- signal
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- transmitter
- water cooling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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Abstract
The invention provides a method for detecting faults of a water cooling system, which comprises the steps of obtaining an analog signal output by a transmitter; the analog signal is used to determine whether the transmitter is malfunctioning; judging whether the flow sensor outputs a frequency signal or not; if the flow sensor outputs a frequency signal, whether a signal loop of the flow sensor is in fault can be judged; if the flow sensor does not output the frequency signal, whether the flow sensor fails or not can be judged. The invention provides guarantee for the correctness detection of the fault in the water cooling system by detecting the running states of the flow sensor and the transmitter in the water cooling system and the signal loop of the flow sensor, and avoids the misoperation risk caused by the abnormity of a single sensor or the transmitter; moreover, when the digital signal wire of the signal loop of the flow sensor is loosened, whether the flow sensor has a fault or not can be accurately judged.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a method for detecting faults of a water cooling system.
Background
The flexible alternating current transmission technology is developed vigorously, and a static synchronous compensator based on an inverter is used as one of flexible alternating current transmission controllers, and is widely applied along with the development of power electronic semiconductor devices and power electronic technologies in recent years. A static synchronous compensator is a reactive-compensation device of the parallel type that is capable of emitting or absorbing reactive power and whose output can be varied to control specific parameters in an electrical power system. The system level protection of the static synchronous compensator is provided with a water cooling system, the water cooling system can ensure normal operation under the maximum design condition and the extreme use condition, a trip signal can be sent out to request the converter valve bank to stop operation under the severe condition, and the static synchronous compensator is isolated from the system so as to ensure the safety of equipment.
In the prior art, a fault detection loop of a water cooling system has detection hidden danger, and whether a flow sensor or a transmitter has a fault or not cannot be correctly judged, so that a protection system of a static synchronous compensator is prone to malfunction or malfunction, the static synchronous compensator is isolated from the system, and the working efficiency of a power grid is affected. For example, a flow sensor sends a pulse-type frequency signal to a transmitter module, the transmitter module converts the pulse-type frequency signal into an analog quantity of 4-20mA, and the analog quantity is sent to a water-cooling controller for logical operation, and due to the design defect, when the flow sensor fails or a digital signal wire from the flow sensor to the transmitter is loosened, the output quantity of the transmitter is also 4mA, so that whether the flow sensor fails or not cannot be judged.
Disclosure of Invention
The invention provides a method for detecting faults of a water cooling system, which aims to solve the problem that whether a flow sensor has faults or not cannot be accurately judged in the prior art.
The invention provides a method for detecting faults of a water cooling system, which comprises the following steps:
acquiring an analog signal output by a transmitter;
the analog signal is used to determine whether the transmitter is malfunctioning;
judging whether the flow sensor outputs a frequency signal or not;
if the flow sensor outputs a frequency signal, whether a signal loop of the flow sensor is in fault can be judged;
if the flow sensor does not output the frequency signal, whether the flow sensor fails or not can be judged.
Optionally, the step of determining whether the flow sensor signal loop has a fault specifically includes:
the water cooling controller converts the frequency signal and the analog signal into a first water flow signal and a second water flow signal;
calculating a difference value between the first water flow signal and the second water flow signal, and taking an absolute value;
obtaining a standard error allowable value;
judging whether the absolute value is larger than the standard error allowable value or not;
and if the absolute value is large, determining that the flow sensor signal loop has a fault, otherwise, outputting the flow sensor signal loop normally.
In the above technical solution, the first water flow signal and the second water flow signal are both numerical water flow data so as to be compared with a standard error allowable value.
Optionally, the determining whether the flow sensor fails specifically includes:
judging whether the water cooling machine is in a working state;
and if the water cooling machine is in a working state, determining that the flow sensor is in a fault, otherwise, determining that the flow sensor is not in a fault.
Optionally, the method for determining whether the transmitter fails specifically includes:
judging whether the analog signal output by the transmitter exceeds 4mA-20 mA;
and if the analog signal exceeds 4-20mA, the transmitter fails, otherwise, the transmitter does not fail.
Further, the processing method for any one of the flow sensor, the flow sensor signal loop and the transmitter to have a fault is as follows:
sending an alarm signal to a water-cooling controller;
and exiting the trip logic judgment participated by the fault part to prevent error trip.
Compared with the prior art, the method for detecting the fault of the water cooling system has the following beneficial effects:
the invention provides guarantee for the correctness detection of the fault in the water cooling system by detecting the running states of the flow sensor and the transmitter in the water cooling system and the signal loop of the flow sensor, and avoids the misoperation risk caused by the abnormity of a single sensor or the transmitter; moreover, when the digital signal wire of the signal loop of the flow sensor is loosened, whether the flow sensor has a fault or not can be accurately judged.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flow chart of the steps of carrying out the present invention;
FIG. 2 is a complete flow chart of the present invention;
FIG. 3 is a flow chart of the present invention for determining whether a signal loop of a flow sensor is faulty;
FIG. 4 is a flow chart of the present invention for determining whether a flow sensor is malfunctioning;
FIG. 5 is a flow chart of the present invention for determining if a transmitter is malfunctioning;
FIG. 6 is a functional block diagram of the present invention;
FIG. 7 is a logic decision diagram of the present invention.
Detailed Description
The static synchronous compensator and the converter mentioned in the background of the invention are briefly explained as follows:
a static synchronous compensator (STATCOM) is a parallel reactive-compensated FACTS device that is capable of emitting or absorbing reactive power, and whose output can be varied to control specific parameters in an electrical power system. When the input end of the solid-state switching converter is connected with a power supply or an energy storage device, the output end of the solid-state switching converter can independently emit or absorb controllable active power and reactive power; it can improve the power system function in the following aspects: dynamic voltage control, power oscillation damping, transient stability, voltage flicker control, and the like.
A Converter (Converter) is a device for performing ac/dc conversion, which is composed of a single or multiple Converter bridges. Converters (Converter) can be divided into two categories: a rectifier (rectifier) and an Inverter (Inverter). A Rectifier (Rectifier) converts alternating current to direct current and an Inverter (Inverter) converts direct current to alternating current.
Referring to fig. 1, a flow chart of the implementation steps of the present invention is shown. The invention provides a method for detecting faults of a water cooling system, which comprises the following steps:
acquiring an analog signal output by a transmitter;
the analog signal is used to determine whether the transmitter is malfunctioning;
judging whether the flow sensor has pulse type frequency signal output;
if the flow sensor outputs a frequency signal, whether a signal loop of the flow sensor is in fault can be judged;
if the flow sensor does not output the frequency signal, whether the flow sensor fails or not can be judged.
Referring to fig. 2 and fig. 3, on the basis of the foregoing specific embodiment, further, the step of determining whether the flow sensor signal loop is faulty specifically includes:
the water cooling controller converts the frequency signal and the analog signal into a first water flow signal and a second water flow signal;
calculating a difference value between the first water flow signal and the second water flow signal, and taking an absolute value;
obtaining a standard error allowable value;
judging whether the absolute value is larger than the standard error allowable value or not;
and if the absolute value is large, determining that the flow sensor signal loop has a fault, otherwise, outputting the flow sensor signal loop normally.
In the technical scheme, the first water flow signal and the second water flow signal are both numerical water flow data so as to be compared with a standard error allowable value; in addition, it should be noted that the standard error allowable value in the present invention can be set differently according to the model of the transmitter, the requirement in actual operation, and experience, and there is no specific numerical value.
It should be noted that, as shown in fig. 6, in this embodiment, the flow sensor signal loop is a signal line between the flow sensor and the transmitter, so that the present invention can accurately determine whether the flow sensor is faulty or whether the signal line between the flow sensor and the transmitter is loose or faulty.
Referring to fig. 2 and 4, on the basis of the foregoing specific embodiment, further determining whether the flow sensor fails specifically includes:
judging whether the water cooling machine is in a working state;
and if the water cooling machine is in a working state, determining that the flow sensor is in a fault, otherwise, determining that the flow sensor is not in a fault.
Referring to fig. 2 and 5, based on the foregoing embodiments, further, the method for determining whether the transmitter is faulty specifically includes:
judging whether the analog signal output by the transmitter exceeds 4mA-20 mA;
and if the analog signal exceeds 4-20mA, the transmitter fails, otherwise, the transmitter does not fail.
Referring to fig. 3-5, based on the above embodiments, further, the method for processing the fault of any one of the flow sensor, the flow sensor signal loop and the transmitter is:
sending an alarm signal to a water-cooling controller;
and exiting the trip logic judgment participated by the fault part to prevent error trip.
In the prior art, a pulse-type frequency signal output by a flow sensor is input into a transmitter, the transmitter outputs a 4-20mA analog signal, and a water cooling controller judges whether a water cooling system fails or not through the received analog signal, so that whether a static synchronous compensator needs to be isolated from the system or not is judged, and the safety of other equipment is ensured.
Referring to fig. 6, a loop is additionally arranged between the flow sensor and the water cooling controller, when the flow sensor outputs a frequency signal, the water cooling controller is used for converting a pulse-type frequency signal output by the flow sensor and a 4mA-20mA analog signal output by the transmitter into a first water flow signal and a second water flow signal in a numerical type respectively; comparing the absolute value of the difference value of the two numerical type first water flow signals and the second water flow signals with a standard error allowable value, and judging whether a signal loop of the flow sensor fails or not according to a comparison result; when the flow sensor has no frequency signal output, whether the flow sensor has a fault is judged according to whether the water cooling machine is in a working state.
Referring to fig. 7, when the frequency signal output is present and the difference between the first water flow and the second water flow is greater than the standard error allowance, the flow sensor signal loop is malfunctioning; when the frequency signal output does not exist and the water cooling machine is in a working state, the flow sensor breaks down; when the analog signal output by the transmitter exceeds the range of 4-20mA, the transmitter fails. When any one of the three faults occurs, an alarm signal is sent to the water-cooling controller, the trip logic judgment of the fault part is quitted, and the false trip is prevented; namely, if the flow sensor has a fault, the trip logic judgment participated by the flow sensor is quitted; if the signal loop of the flow sensor has a fault, the trip logic judgment participated by the signal loop of the flow sensor is quitted; and if the transmitter fails, exiting the trip logic judgment of the transmitter participation.
It should be noted that, in the present invention, the descriptions of "first" and "second" are only used for distinguishing the converted frequency signal from the analog signal so as to better explain the method of the present invention, and do not have any practical meaning or sequence order.
The embodiments provided by the present invention are only examples under the general concept of the present invention, and do not constitute a limitation to the scope of the present invention. Any other embodiments extended by the solution according to the invention without inventive step will be within the scope of protection of the invention for a person skilled in the art.
Claims (5)
1. A method for water cooling system fault detection, the method comprising the steps of:
acquiring an analog signal output by a transmitter;
the analog signal is used to determine whether the transmitter is malfunctioning;
judging whether the flow sensor outputs a frequency signal or not;
if the flow sensor outputs a frequency signal, whether a signal loop of the flow sensor is in fault can be judged;
if the flow sensor does not output the frequency signal, whether the flow sensor fails or not can be judged.
2. The method for detecting the fault of the water cooling system according to claim 1, wherein the step of judging whether the flow sensor signal loop is faulty specifically comprises the steps of:
the water cooling controller converts the frequency signal and the analog signal into a first water flow signal and a second water flow signal;
calculating a difference value between the first water flow signal and the second water flow signal, and taking an absolute value;
obtaining a standard error allowable value;
judging whether the absolute value is larger than the standard error allowable value or not;
and if the absolute value is large, determining that the flow sensor signal loop has a fault, otherwise, outputting the flow sensor signal loop normally.
3. The method for detecting the fault of the water cooling system according to claim 1, wherein judging whether the flow sensor has the fault specifically comprises:
judging whether the water cooling machine is in a working state;
and if the water cooling machine is in a working state, determining that the flow sensor is in a fault, otherwise, determining that the flow sensor is not in a fault.
4. The method for water cooling system fault detection according to claim 1, wherein the method for determining whether the transmitter is faulty specifically comprises:
judging whether the analog signal output by the transmitter exceeds 4mA-20 mA;
and if the analog signal exceeds 4-20mA, the transmitter fails, otherwise, the transmitter does not fail.
5. The method for detecting the fault of the water cooling system according to any one of claims 2 to 4, wherein the method for processing the fault of any one of the flow sensor, the flow sensor signal loop and the transmitter is as follows:
sending an alarm signal to a water-cooling controller;
and exiting the trip logic judgment participated by the fault part to prevent error trip.
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| CN202010320530.XA CN111366218B (en) | 2020-04-22 | 2020-04-22 | Method for detecting faults of water cooling system |
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| CN202010320530.XA CN111366218B (en) | 2020-04-22 | 2020-04-22 | Method for detecting faults of water cooling system |
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