CN212432376U - Voltage transformer winding internal temperature monitoring system - Google Patents
Voltage transformer winding internal temperature monitoring system Download PDFInfo
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- CN212432376U CN212432376U CN202020888575.2U CN202020888575U CN212432376U CN 212432376 U CN212432376 U CN 212432376U CN 202020888575 U CN202020888575 U CN 202020888575U CN 212432376 U CN212432376 U CN 212432376U
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Abstract
The utility model relates to an inside temperature monitoring system of voltage transformer winding. A system for monitoring the internal temperature of a voltage transformer winding comprises a power distribution controller, an ammeter, a voltmeter and an instant load; the power distribution controller is provided with a power distribution processor; the ammeter and the voltmeter are arranged at the primary end of the power distribution controller, connected with the winding output end of the voltage transformer and also connected with the power distribution processor; the instant load is arranged at the secondary end of the power distribution controller, is connected with the power distribution processor, and is driven by the power distribution processor to be switched on or off at the secondary end. The utility model discloses an accurate control instantaneous load of distribution treater when detecting voltage transformer's inside winding temperature with the switch-on and the turn-off of distribution controller secondary, make the equivalent resistance of the inside winding of voltage transformer calculate fast and obtain, find the temperature of the inside winding of voltage transformer promptly and cross the limit harm.
Description
Technical Field
The utility model relates to a transformer monitoring field especially relates to an inside temperature monitoring system of voltage transformer winding.
Background
The intelligent switch of the power distribution network is used as important line load management and control equipment of a 10kV overhead line, has automatic positioning and cutting functions of line short circuit and earth fault, is typically applied to T joints of line head ends, segmentation points, large branch line head ends, trunk line ends and user lines, limits fault power failure range and power failure time to the minimum degree, and effectively improves power supply reliability of the power distribution network.
The device mainly comprises the following components: the common box type vacuum switch, the distribution controller, the voltage transformer and the control cable are shown in the lower drawing. The control cables are divided into two types, namely a power cable and a switch measurement and control cable; the power supply cable is used for electrically connecting the voltage transformer and the distribution controller, and the switch measuring cable is used for electrically connecting the vacuum circuit breaker and the feeder terminal.
The voltage transformer (PT for short) mainly realizes voltage monitoring of the power distribution overhead line and provides a power supply to the power distribution controller. Before and after 2006, a design scheme that a voltage transformer is arranged in a vacuum switch is designed, and due to the fact that the design scheme is convenient to install (a process of another voltage transformer, a supporting bracket and the like are omitted), the design scheme is widely used by provincial and municipal electric power companies with earlier power distribution automation construction such as Beijing and Shandong, and is counted by a certain company, and the number of the voltage transformers is not less than 2 ten thousand for the Shandong provincial electric power companies. With continuous operation, some problems of the built-in voltage transformer are gradually revealed.
Other accessories such as a current transformer (used for measuring and monitoring line current), a vacuum arc-extinguishing chamber (used for cutting off normal power supply load current and cutting off fault current when in fault) and an operating mechanism are integrated in the conventional switch;
from the anatomical view of the existing malfunctioning product, the source of the malfunction is directed to the built-in PT. In a fault recurrence test, the project group finds that the fault characteristics of the built-in PT are basically the same as the characteristics of the PT caused by turn-to-turn short circuit or interlayer short circuit. And meanwhile, the test also shows that the PT can continuously run for more than 3-7 hours even if the interlayer is short-circuited. In the process, the most obvious fault characteristics are that the temperature of the coil rises and the internal resistance becomes large.
Because built-in PT installs in high-pressure environment, current temperature sensor all has various drawbacks: for example, a wireless temperature sensor needs a built-in battery, and the battery needs to be replaced by regularly power failure due to the influence of the service life of the battery; due to the cost, the wireless passive temperature sensor and the optical fiber sensor are difficult to be applied in the field of distribution networks on a large scale. Moreover, they all have one of the biggest problems: the temperature measured by all the temperature sensors is the surface temperature. The internal temperature of the PT winding is transmitted to the surface through the thick epoxy resin insulating layer, so that the transmission speed is low, and the existing temperature difference is large. It is difficult for the conventional temperature sensor to accurately measure the internal temperature of the PT winding.
Patent document No. ZL201510429451.1 discloses an online temperature monitoring device for a voltage transformer, which is characterized by comprising a transformer for transforming voltage grades, a current collecting module for collecting primary current of the transformer, a voltage collecting module for collecting primary voltage of the transformer, an instantaneous load, and a control unit for calculating equivalent internal resistance variation of the voltage transformer side, controlling the input of the instantaneous load and controlling the on-off of primary equipment in the interval; the control unit controls the instantaneous load to be put in at regular time, and simultaneously collects the primary current and the primary voltage of the transformer, calculates the equivalent internal resistance variable quantity of the voltage transformer side according to the variable quantity of the current and the voltage, and deduces the temperature rise value of the internal winding of the voltage transformer according to the temperature coefficient of the lead material.
However, the temperature rise value derived from the temperature coefficient of the wire material generally has errors, so that the internal temperature monitoring of the existing voltage transformer is insufficient and needs to be improved.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing prior art, an object of the utility model is to provide an inside temperature monitoring system of voltage transformer winding can discern the voltage transformer inside temperature fast and whether cross the limit.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a system for monitoring the internal temperature of a voltage transformer winding comprises a power distribution controller, an ammeter, a voltmeter and an instant load; the power distribution controller is provided with a power distribution processor;
the ammeter and the voltmeter are arranged at the primary end of the power distribution controller, connected with the winding output end of the voltage transformer and also connected with the power distribution processor; the instant load is arranged at the secondary end of the power distribution controller, is connected with the power distribution processor, and is driven by the power distribution processor to be switched on or off at the secondary end.
Preferably, the voltage transformer winding internal temperature monitoring system, the instant load comprises a control component and a load component; the load assembly is erected at the secondary end of the power distribution controller;
the control assembly comprises a relay and a current limiter; the relay is provided with a normally open switch, and meanwhile, one end of the relay is connected with the current limiter, and the other end of the relay is grounded; the current limiter is connected with the power distribution processor;
the load component is provided with a protection resistor; and one end of the protection resistor is connected with one end point of the secondary end of the power distribution controller through the normally open switch.
Preferably, in the system for monitoring the temperature inside the voltage transformer winding, the protection resistor includes a first protection resistor and a second protection resistor connected in parallel.
Preferably, in the internal temperature monitoring system of the voltage transformer winding, the first protection resistor is a fuse tube; the second protection resistor is a thermistor.
Preferably, the system for monitoring the temperature inside the voltage transformer winding further comprises an alarm device connected with the power distribution processor and used for sending alarm information to the outside according to the signal of the power distribution processor.
Compared with the prior art, the utility model provides a pair of inside temperature monitoring system of voltage transformer winding, the utility model discloses a switch-on and turn-off of accurate control instantaneous load of distribution treater and distribution controller secondary end when detecting voltage transformer's inside winding temperature makes the equivalent resistance of the inside winding of voltage transformer calculate fast and obtains, finds the temperature of the inside winding of voltage transformer and crosses the limit harm immediately.
Drawings
FIG. 1 is a block diagram of an internal temperature monitoring system provided by the present invention;
fig. 2 is a circuit diagram of a transient load provided by the present invention;
fig. 3 is a flow chart of an internal temperature monitoring method provided by the present invention;
FIG. 4 is a data line graph of internal resistance values for 1# and 2# PTs measured using a bridge as provided by the present invention;
FIG. 5 is a data line graph of internal resistance values of 1# and 2# PTs measured using an internal temperature monitoring method as provided by the present invention;
fig. 6-8 are test data line graphs with the access time of the instant load of 100ms, 200ms, and 300ms, respectively.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the following description of the present invention will refer to the accompanying drawings and illustrate embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1-3, the present invention provides a system for monitoring the internal temperature of a winding of a voltage transformer, which comprises a distribution controller TRAN2, an ammeter a1, a voltmeter V and an instantaneous load SS; said power distribution controller TRAN2 having a power distribution processor (not shown);
the ammeter A1 and the voltmeter V are arranged at the primary end of a distribution controller TRAN2, connected with the winding output end of the voltage transformer and further connected with the distribution processor; the instantaneous load SS is arranged at the secondary end of a distribution controller TRAN2, is connected with the distribution processor, and is driven by the distribution processor to be switched on and off with the secondary end.
Specifically, the power distribution processor is an original device in a power distribution controller TRAN2, and is not limited; the ammeter A1 and the voltage are common detection devices in the field, and are not limited, the detection periods of the ammeter A1 and the voltage are the same and are both 10-50ms once, and the preferred detection period is 20ms for detecting data once; the instant load SS can be switched on and off accurately by the power distribution processor. An ammeter A1 and a voltmeter V measuring loop are added at the primary end of a transformer TRAN2 (transformation ratio 220:35) in a distribution controller TRAN 2; the secondary end is provided with an instantaneous load adjusting loop, and the impedance of the instantaneous load and the internal resistance of the voltage transformer are in the same order of magnitude (generally, several omega levels). The distribution processor of the distribution controller TRAN2 controls the instantaneous load to be put into use at regular time, detects the variable quantities of the current and the voltage of the primary circuit of the transformer (TRANs2), calculates the equivalent internal resistance variable quantity of the PT side according to the variable quantities of the parameters, and can judge the risk state of the internal temperature of the internal winding of the voltage transformer in advance according to the equivalent internal resistance variable quantity so as to give an alarm.
Correspondingly, the utility model also provides an inside temperature monitoring method of voltage transformer winding, including the step:
s1, the power distribution processor drives the instantaneous load SS and the secondary end of the power distribution controller TRAN2 to be switched on and off according to a preset strategy; the ammeter A1 detects current detection data of the output end of the voltage transformer winding; the voltmeter V detects voltage detection data of the output end of the voltage transformer winding;
s2, the power distribution processor receives the current detection data and the voltage detection data, and calculates an equivalent resistance value of the voltage transformer winding according to an equivalent resistance algorithm;
s3, the power distribution processor judges whether the equivalent resistance exceeds an alarm threshold value, if so, alarm information is sent out; if not, step S1 is executed.
Preferably, in step S3, the power distribution processor may calculate the temperature inside the voltage transformer at that time according to the equivalent resistance and the temperature coefficient of resistivity of the winding material (e.g., copper) inside the voltage transformer, and further display the temperature to the outside, where the display mode may be a fuzzy display (e.g., displaying different colors to indicate the temperature) or an accurate display (displaying different data to indicate the temperature).
Preferably, in this embodiment, the instant load SS includes a control component and a load component; the load assembly is erected at the secondary end of the distribution controller TRAN 2;
the control assembly comprises a relay FZ and a current limiter D2; the relay FZ is provided with a normally open switch, one end of the relay FZ is connected with the current limiter D2, and the other end of the relay FZ is grounded; the current limiter D2 is connected with the power distribution processor;
the load component is provided with a protective resistor R1/R2; one end of the protection resistor R1/R2 is connected with one end point of the secondary end of the distribution controller TRAN2 through the normally open switch.
In the voltage transformer winding internal temperature monitoring system, the protection resistor comprises a first protection resistor R1 and a second protection resistor R2 which are connected in parallel.
Preferably, in this embodiment, the first protection resistor is a fuse tube; the second protection resistor is a thermistor.
Specifically, in fig. 2, the wiring diagram of the secondary side of the distribution controller TRAN2 and the distribution processor is not directly shown, but a load terminal X1 and a control terminal X2 are used as intermediate connection devices; the control component is directly controlled by the power distribution processor, the control component can be activated by a control signal DO05 (for example, 24V voltage) after the power distribution processor outputs a certain high level, after the current limiter D2 is passed, the relay FZ is electrified, and then a normally open switch 3-4/5-6 on the relay FZ is closed; meanwhile, in order to make the control component form a loop, the relay FZ is grounded, in this embodiment, the grounding is implemented by connecting the terminal 24VGND to ground; thereby controlling the passage of the load assembly and the secondary end of the distribution controller TRAN 2; the time for maintaining the load assembly on can be set to 0-1000 ms. In this embodiment, the connection terminal AC35VL in the load component is connected to the phase line in the secondary side of the distribution controller TRAN2, and the connection terminal AC35VN is connected to the neutral line in the secondary side; two normally open switches 3-4/5-6 are arranged on the relay FZ in the control assembly, and after the relay FZ is electrified, the normally open switches are closed, so that the short circuit of the secondary end of the distribution controller TRAN2 is finally realized, and the equivalent resistance of the internal winding of the voltage transformer is realized. The corresponding working principle of the transient load is as follows: referring to fig. 2, DO05 is a control signal (off) for the distribution processor to control the operation of the relay FZ (preferably, model G2R-1A-E-24VDC) to receive the trigger signal of the distribution processor, so that the secondary terminal of the distribution controller TRAN2 (AC 35VL and AC35VN in fig. 2, respectively) simulates the switching on/off of the instantaneous load according to the DO05 pulse time. Wherein protection resistance R1/R2 is in order to prevent relay FZ's normally open switch bonding setting, respectively with the two normally open switches of relay FZ wherein, protection resistance R1 is the fuse tube, and protection resistance R2 is PTC thermistor.
Preferably, in this embodiment, the power distribution system further includes an alarm device (not shown) connected to the power distribution processor, and configured to send an alarm message to the outside according to a signal of the power distribution processor. It should be noted that the alarm manner of the alarm device described herein includes sound, LED lamp or screen display; if the LED lamps are used for displaying, a plurality of LED lamps can be used for displaying different temperature levels, and lamps with different colors can also be used for displaying different temperature levels; if the LED screen displays, the internal temperature value and the danger level (the high, the low and the medium can be positioned) can be directly displayed.
Preferably, in this embodiment, in step S2, the equivalent resistance algorithm is:
wherein R isiIs an equivalent resistance value; u shapenDetecting data for voltmeter V before the instantaneous load is switched on; u shapesVoltage meter V detection data when the instantaneous load is on, i.e. the voltage detection data; i issThe current meter a1 detects data for the instant load on, i.e., the current detection data.
Preferably, in step S3, in the embodiment, the equivalent resistance is calculated by the power distribution processor calculating the equivalent resistance value a plurality of times, and then calculating an average of the plurality of equivalent resistance values as the final equivalent resistance value. Here, in the case where the instantaneous load is turned on, the current data and the voltage data are detected several times during the time period in which the load is continuously turned on, and further, the current data and the voltage data are calculated several times to obtain a plurality of equivalent resistance values, and an average value is obtained to prevent erroneous determination.
Preferably, in this embodiment, in step S1, the predetermined policy is: the instantaneous short-circuit duration of the instantaneous load SS is 100-300ms, and the time interval of two-time monitoring is 1-5 h. Preferably, the short-circuit duration is 100ms, and the two-time monitoring time interval is 5 h. Preferably, in step S3, after the alarm message is sent out, step S1 needs to be executed, but the corresponding predetermined policy needs to be changed, wherein the two-time monitoring time interval is modified to 10-30min, so that the equivalent resistance value of the internal winding of the voltage transformer can be ensured to be grasped in real time.
Referring to fig. 6-8, the instant load access time is 100mS, 200mS, and 300mS, respectively, the interval time is 10 minutes, and the test is performed for more than 4 hours, it can be clearly known that the instant load access has little influence on the temperature rise of the PT itself, and the lateral deviation of the test result is about ± 0.6 Ω, which meets the requirement of the test precision. The final preferred mode is 100ms in view of the increased efficiency.
Preferably, in this embodiment, before the step S1, the method further includes:
and S0, electrifying the distribution controller TRAN2 for the first time, executing the steps S1-S2, and obtaining the equivalent resistance value of the voltage transformer winding as a sampling calculation initial value. Generally, the initial value of the sampling calculation is approximate to 0, and is set to 0 in the initial stage of the equipment, and the initial value of the sampling calculation is performed once in the first working of the low-voltage controller and is used for performing one evaluation on the self device of the equipment.
Comparing the internal resistance result of the voltage Transformer measured by the bridge with the test result of the internal temperature monitoring method provided by the present invention, please refer to fig. 4-5, wherein, two PTs (Potential Transformer) are kept at a constant temperature of 110 ℃, and after the constant temperature is kept for 5 hours, the actual resistance value of the bridge is measured (measured once in half an hour) during the cooling process of the two PTs as shown in fig. 4; the resistance change (once in half an hour) measured by the internal temperature monitoring method provided by the utility model in the two PT cooling processes is shown in figure 5; therefore, the utility model provides an inside temperature monitoring method of voltage transformer obtains the result similar with the actually measured result of electric bridge, can realize the accurate measurement of the inside winding of voltage transformer.
It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.
Claims (5)
1. A system for monitoring the internal temperature of a voltage transformer winding is characterized by comprising a power distribution controller, an ammeter, a voltmeter and an instant load; the power distribution controller is provided with a power distribution processor;
the ammeter and the voltmeter are arranged at the primary end of the power distribution controller, connected with the winding output end of the voltage transformer and also connected with the power distribution processor; the instant load is arranged at the secondary end of the power distribution controller, is connected with the power distribution processor, and is driven by the power distribution processor to be switched on or off at the secondary end.
2. The voltage transformer winding internal temperature monitoring system of claim 1, wherein the transient load comprises a control component and a load component; the load assembly is erected at the secondary end of the power distribution controller;
the control assembly comprises a relay and a current limiter; the relay is provided with a normally open switch, and meanwhile, one end of the relay is connected with the current limiter, and the other end of the relay is grounded; the current limiter is connected with the power distribution processor;
the load component is provided with a protection resistor; and one end of the protection resistor is connected with one end point of the secondary end of the power distribution controller through the normally open switch.
3. The system of claim 2, wherein the protection resistor comprises a first protection resistor and a second protection resistor connected in parallel.
4. The system according to claim 3, wherein said first protection resistor is a fuse tube; the second protection resistor is a thermistor.
5. The system for monitoring the internal temperature of the winding of the voltage transformer according to claim 1, further comprising an alarm device connected to the power distribution processor for sending an alarm message to the outside according to the signal of the power distribution processor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020888575.2U CN212432376U (en) | 2020-05-25 | 2020-05-25 | Voltage transformer winding internal temperature monitoring system |
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| CN202020888575.2U CN212432376U (en) | 2020-05-25 | 2020-05-25 | Voltage transformer winding internal temperature monitoring system |
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| CN212432376U true CN212432376U (en) | 2021-01-29 |
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Address after: 411201 28 Bai Shi Road, Jing Kai District, Xiangtan, Hunan Patentee after: Weisheng Energy Technology Co.,Ltd. Address before: 411201 28 Bai Shi Road, Jing Kai District, Xiangtan, Hunan Patentee before: WASION ELECTRIC Co.,Ltd. |