TWI459013B - Operation test system of protective relay device - Google Patents

Description

Action test system for protecting relay device

The present invention relates to an operation test system for a protective relay device that performs an operation test of a protective relay device that protects an electrical device from system abnormalities.

Among the protective relay devices used in the switchboard, there is a self-monitoring function that monitors the internal power supply voltage. However, in terms of protecting the relay device, it has been generally confirmed by the relay test during the periodic inspection every year to several years, but since the electrical equipment is always in operation, Signal input, so it is difficult to determine whether the electrical equipment is abnormal or the relay device is abnormal.

In the past, for example, Japanese Laid-Open Patent Publication No. 2010-284057 (Patent Document 1) discloses a characteristic test system for a protective relay device that performs a characteristic test of a protective relay device that protects an electrical device from system abnormalities. In Patent Document 1, an input cutoff switch for cutting off an input from a system is provided in a front stage of an analog input circuit for protecting a relay device, thereby cutting off an electrical input from a system to an analog input circuit. In this state, the test waveform is input to the analog input circuit to protect the relay. By setting the action, the characteristic test of the protective relay device is carried out without the power failure.

[Previous Technical Literature] (Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 2010-284057

According to the characteristic test system for protecting the relay device disclosed in the aforementioned Patent Document 1, the characteristic test of the existing protective relay device connected to the system can be performed without stopping the power supply or stopping the power. However, since the input from the system is cut off during the characteristic test of the protective relay device, it becomes a state in which the electrical device cannot be protected.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an operation test of a protective relay device capable of confirming the soundness of a protection function by using a test signal generated by a test signal generating circuit while monitoring an input from the outside. system.

The action test system for protecting the relay device of the present invention detects the abnormality of the system, protects the electrical equipment of the system from the abnormality of the system, and has an analog measurement circuit that receives an input signal from the system and outputs an analog measurement value; The aforementioned analog measurement output of the analog measurement circuit is converted into an analog/digital converter (A/D converter) of the digital signal; and the test signal for the protection relay device is generated. a signal generating circuit; in the preceding stage of the analog measuring circuit of the protection relay device, switching a switch of the test signal and an input signal from the system; using the digital signal from the analog/digital converter Entering and inputting, performing a protection calculation of the protection relay device and an instruction issued according to an instruction of protection or control of the calculation result, and controlling a switching timing of the switching switch; and comparing the analog measurement circuit and the foregoing The aforementioned test signal input by the analog/digital converter and the aforementioned test signal directly input from the test signal generating circuit to determine whether there is an abnormal protection/monitoring processing section, and interactively test the aforementioned test from the analog/digital converter The signal and the aforementioned input signal from the aforementioned system are subjected to sampling to monitor the presence or absence of an abnormality.

According to the operation test system for protecting the relay device of the present invention, not only the operation test of the existing protection relay device connected to the system can be performed without stopping the power supply or stopping the power, even during the operation test period. Protects electrical equipment.

1, 1a to 1n‧‧‧ transformer

1t‧‧‧Test terminals

2, 2a to 2n‧‧‧Toggle switch

3, 3a to 3n‧‧‧ analog measuring circuit

4‧‧‧ Analog/Digital Converter

5‧‧‧CPU

5a‧‧‧Protection/Monitoring and Processing Department

6‧‧‧Test signal generation circuit

7‧‧‧Mechanical relay

8‧‧‧Output circuit

9‧‧‧Central monitoring device

10‧‧‧Communication circuit

11‧‧‧ Display means

12‧‧‧Measurement Display Processing Department

13‧‧‧ analog switch

14‧‧‧Insulation

15‧‧‧Input circuit

100, 200, 300, 400‧‧‧protective relays

Fig. 1 is a block diagram showing the operation test system of the protective relay device according to the first embodiment of the present invention.

Fig. 2 (a) and (b) are views showing the operation of the operation test system of the protective relay device according to the first embodiment of the present invention.

Fig. 3 (a) to (c) are diagrams for explaining the protective relay of the first embodiment of the present invention. A diagram of a specific embodiment of the action test system.

Fig. 4 is a view showing a specific embodiment of the operation test system for the protective relay device according to the first embodiment of the present invention.

Fig. 5 (a) and (b) are views showing a specific embodiment of an operation test system for a protective relay device according to a first embodiment of the present invention.

Fig. 6 (a) to (c) are views showing a specific embodiment of an operation test system for a protective relay device according to Embodiment 1 of the present invention.

Fig. 7 is a view showing a specific embodiment of an operation test system for a protective relay device according to Embodiment 1 of the present invention.

Fig. 8 is a view showing a specific embodiment of the operation test system for the protective relay device according to the first embodiment of the present invention.

Fig. 9 is a block diagram showing the operation test system of the protective relay device according to the second embodiment of the present invention.

Fig. 10 is a view for explaining the operation of the operation test system for the protective relay device according to the second embodiment of the present invention.

Fig. 11 is a block diagram showing the operation test system of the protective relay device according to the third embodiment of the present invention.

Fig. 12 is a view for explaining the operation of the operation test system of the protective relay device according to the third embodiment of the present invention.

Fig. 13 is a block diagram showing the operation test system of the protective relay device according to the fourth embodiment of the present invention.

Hereinafter, a preferred embodiment of the operation test system for the protective relay device of the present invention will be described with reference to the drawings. In each figure, the same symbol The numbers indicate the same or equivalent parts.

Embodiment 1.

Fig. 1 is a block diagram showing the operation test system of the protective relay device according to the first embodiment of the present invention.

In Fig. 1, reference numeral 100 denotes a protective relay device. The protective relay device 100 includes an inverter (such as a transformer) that converts an input signal from a system (not shown) (such as a transformer); and is input from the transformer 1 via the changeover switch 2; The signal is amplified, and the filter circuit is used to remove the noise analog circuit 3; the analog signal from the analog measurement circuit 3 is converted into a digital signal analog/digital converter (A/D converter) 4; for calculation and protection, Or the CPU 5 that switches the switching process of the switch 2; and the test signal generating circuit 6 that generates the test waveform in accordance with an instruction from the CPU 5. The changeover switch 2 is configured to switch between a signal input from the analog measuring circuit 3 and a signal input from the transformer 1 and a signal input from the test signal generating circuit 6 in accordance with an instruction from the CPU 5. The test signal generating circuit 6 is composed of a digital/analog converter (D/A converter) or a circuit that can generate signals of any size.

In addition, the protection relay device 100 further has: An output circuit 8 for operating the mechanical relay 7; a communication circuit 10 for communicating with the central monitoring device 9 for collecting information from the protective relay device 100; and a test signal for the display system, the test signal generating circuit 6, and the like A display means 11 such as a lamp or a display screen.

The action test system of the protective relay device of the first embodiment The system is configured as described above, and the operation will be described below.

When sampling the input from the system, the CPU 5 causes the switch 2 to switch the connection to the transformer 1 or the test signal generating circuit 6 at the time of sampling, as shown in Figs. 2(a) and (b). The signals from the transformer 1 and the signals from the test signal generating circuit 6 are sampled interactively. The number of samplings is set to any value of more than one cycle per current or voltage waveform. The sampled data, although it is the data of the two signal synthesis, is divided into the data of the test signal generation circuit 6 and the data of the transformer 1 according to the timing of the sampled data in the software processing of the CPU 5. Then, the CPU 5 performs protection/monitoring processing on each of the divided pieces of data by the protection/monitoring processing unit 5a. In the present embodiment, the protection/monitoring processing unit 5a is illustrated as a functional unit inside the CPU 5. However, the protection/monitoring processing unit 5a may be provided as a functional unit outside the CPU 5.

The CPU 5 detects a system abnormality based on the signal from the transformer 1, and operates the mechanical relay 7 via the output circuit 8 to open the circuit breaker (not shown). On the other hand, if the protection operation is performed based on the signal from the test signal generating circuit 6, the mechanical relay 7 is not operated, and the result of the protection operation is transmitted to the central monitoring device 9 via the communication circuit 10. Thereby, the soundness of the protection function can be confirmed.

With the above configuration, it is possible to monitor the signal from the transformer 1, that is, the input from the system, and use the test signal generated by the test signal generating circuit 6 to confirm the soundness of the protection function. Further, in the above description, the case where the transformer 1 is used will be described, but the same applies to the case of using the current transformer.

Next, a specific embodiment will be described with respect to the protection/monitoring process performed by the CPU 5.

(Example 1)

The test signal generating circuit 6 generates a DC signal in accordance with an instruction from the CPU 5. The CPU 5 performs monitoring by inputting this DC signal as a test signal. The so-called DC signal does not specify the width (time) and size of the signal. For example, it may be a pulse-like waveform once per cycle.

For example, the straightness generated in the test signal generating circuit 6 can be made. The stream signal is a pulse-like signal as shown in the upper part of Fig. 3(a), and the specified signal generation interval is t1, the signal width is t2, and the signal size is d. Then, in the software processing inside the CPU 5, the output signal of the analog/digital converter 4 shown in FIG. 3(b) is divided into the test shown in FIG. 3(c) according to the timing of the sampling data. The information of the signal generating circuit 6 and the information of the transformer 1. The lower section of Figure 3(a) shows the input signal from the system. Further, in Fig. 3(c), the upper stage displays the data of the test signal generating circuit 6, and the lower stage shows the signal from the transformer 1.

As described above, the test of the test signal generating circuit 6 In the monitoring process of the signal, by monitoring the values, it is possible to find a failure of the circuit component, for example, when the input terminal of the changeover switch 2 or the analog/digital converter 4 is in an ON state.

(Example 2)

Further, as shown in FIG. 4, the test signal of the test signal generating circuit 6 is gradually increased from 0 to the measurable range, and the measurable range can be confirmed. Precision. Further, as shown in FIGS. 5(a) and (b), the test signal of the test signal generating circuit 6 is made larger as each sample becomes larger, and even if a circuit abnormality occurs in one cycle, the test signal can be instantaneously Detected. Further, in the fourth and fifth figures, the upper stage displays the test signal of the test signal generating circuit 6, and the lower stage shows the signal from the transformer 1.

(Example 3)

In the foregoing description, the case where the DC signal is generated by the test signal generating circuit 6 will be described, but the sine wave signal may be generated in the test signal generating circuit 6. Next, a case where the protection function is confirmed by a sine wave will be described.

The test signal of the test signal generating circuit 6 is made as the sixth The sinusoidal signal shown in the upper part of Fig. (a) is such that the size and frequency of the signal are values which are within a range defined by the specifications of the product protecting the relay device 100, that is, a predetermined value, and the protection function is activated. Then, in the software processing inside the CPU 5, the output signal of the analog/digital converter 4 shown in FIG. 6(b) is divided into the test as shown in FIG. 6(c) according to the timing of the sampling data. The information of the signal generating circuit 6 and the information of the transformer 1. The lower section of Figure 6(a) shows the input signal from the system. In addition, the upper part of Fig. 6(c) shows the data of the test signal generating circuit 6, and the lower part shows the signal from the transformer 1.

Thus, it can be used instead of protecting the relay device 100. The relay test is carried out during regular inspections. By using the communication circuit 10 mounted on the protective relay device 100, the data of the operation result is periodically collected by the central monitoring device 9, and the protection device can be confirmed by the central monitoring device 9. The action changes can be.

(Example 4)

In the third embodiment, the test signal is made to be a sine wave, and the protection function of the protection relay device 100 is operated corresponding to the test waveform. However, in the fourth embodiment, the test signal is used as the analog measurement of the protection relay device 100. The case of monitoring the circuit 3.

The test signal generating circuit 6 is sinusoidal output in advance The test signal of the specified value (for example, the maximum value of the measurement range). The CPU 5 performs protection and monitoring processing common to the monitoring data for the acquired test signal, and compares it with a predetermined value. Figure 7 is a diagram showing a specific embodiment thereof.

In this method, because of the test signal generation circuit 6 The test signal is equivalent to the current and the voltage input from the system, that is, the transformer 1 is input. Therefore, in addition to confirming the soundness of the analog measuring circuit 3 and the analog/digital converter 4, the internal protection of the CPU 5 can be diagnosed immediately. The monitoring process is performed to realize the protection relay device 100 with high reliability.

(Example 5)

Further, as shown in FIG. 8, the CPU 5 has the measurement display processing unit 12, and since the conversion result of the test signal is displayed on the display screen of the display means 11, the user who protects the relay device 100 can pass through the screen. The comparison confirms the measured value from the input of the system, that is, the input of the transformer 1 and the test signal.

By utilizing the operating function of the protective relay device 100, it is possible to specify Test the size of the signal, so the user can specify the analog measurement circuit 3 Any value in the measurement range can be visually confirmed, and the soundness of the value can be visually confirmed, and the soundness confirmation can be performed by the central monitoring device 9 via the communication circuit 10.

Embodiment 2.

Next, an operation test system for the protective relay device according to the second embodiment of the present invention will be described. In recent years, protective relay devices are generally equipped with a plurality of protective elements. Although the first embodiment is an example of a single circuit, the present invention is also applicable to a protective relay device having a plurality of circuits.

Figure 9 is a diagram for explaining the protection relay of Embodiment 2 The block diagram of the action test system. In Fig. 9, reference numeral 200 denotes a protection relay device. The protection relay device 200 includes transformers 1a and 1b and converters 1c and 1n for converting input signals from a system (not shown), and is provided with n types of transformers 1a and 1b and converters 1c and 1n. The input signals are amplified by the changeover switches 2a, 2b, 2c, 2n, respectively, and the analog circuits 3a, 3b, 3c, 3n are removed by the filter circuit. Further, the analog/digital converters 4 are provided with corresponding input terminals 1 to n, respectively. The other configurations are the same as those in the first embodiment, and the same reference numerals will be given thereto, and the description thereof will be omitted.

The operation test system of the protective relay device according to the second embodiment is configured as described above, and the CPU 5 specifies the size of the circuit and the signal to be outputted by the test signal to the test signal generating circuit 6. The test signal generation circuit 6 inputs a signal corresponding thereto to the target circuit. Here, a plurality of circuits can also be selected.

The CPU 5 is instructed to give the test signal generating circuit 6 Then, switching between the switching switches 2a, 2b, 2c, and 2n corresponding to the analog measuring circuits 3a, 3b, 3c, and 3n as the object is performed in accordance with the timing of sampling. In the case of an analog/digital converter 4 in which a plurality of channels can be simultaneously sampled, a waiting time is set before and after switching to prevent the influence of noise occurring at the time of switching of the changeover switches 2a, 2b, 2c, 2n. Fig. 10 is a view for explaining the operation of the operation test system of the protective relay device according to the second embodiment, and shows an example of the sampling sequence of the CPU 5 provided in the protective relay device 200.

As mentioned above, even with multiple circuits Similarly to the first embodiment, the relay relay device 200 can monitor the signals from the transformers 1a, 1b and the converters 1c, 1n, that is, the input from the system, while using the test signals generated by the test signal generating circuit 6. To confirm the soundness of the protection function.

Embodiment 3.

Next, an operation test system for the protective relay device according to the third embodiment of the present invention will be described. Fig. 11 is a block diagram showing the operation test system of the protective relay device of the third embodiment. The third embodiment is a modification of the second embodiment, and as shown in FIG. 11, the configuration in which the input terminal of the analog/digital converter 4 of the relay device 300 is one point is protected. When a plurality of elements are input, an analog switch 13 of 1:n is provided in the front stage of the analog/digital converter 4, and the sampling of each input from the outside is performed while sequentially switching.

At the end of the sampling of each element, the switch will be made in advance. The switches 2a, 2b, 2c, 2n are switched to be connected to the test signal generating circuit 6. Such as Therefore, since the time from the switching between the inputs of the transformers 1a, 1b, the converters 1c, 1n and the input from the test signal generating circuit 6 is generated, the mismatching of the switching switches 2a, 2b, 2c, 2n can be reduced. The impact of the news. Fig. 12 is a view for explaining the operation of the operation test system of the protective relay device of the third embodiment, and shows an example of the sampling sequence of the CPU 5 provided in the protective relay device 300.

Embodiment 4.

Next, an operation test system for a protective relay device according to a fourth embodiment of the present invention will be described. At this point, the case where the test signal of the test signal generating circuit 6 is input to the analog measuring circuit 3 will be described, but it may be input to the primary side of the transformer or the converter (herein described by a transformer) 1. Thereby, it is confirmed that the soundness of the transformer 1 inside the relay device is protected.

Figure 13 is a diagram showing the protective relay device of the fourth embodiment The block diagram of the action test system. In Fig. 13, reference numeral 400 denotes a protective relay device. The protective relay device 400 includes an insulating portion 14 between the primary side of the transformer 1 and an internal circuit of the protective relay device 400, and an input circuit 15 connected to the test terminal 1t of the transformer 1. The other configurations are the same as those in the first embodiment, and the same reference numerals will be given thereto, and the description thereof will be omitted.

The operation test system of the protective relay device according to the fourth embodiment is configured as described above. Since the test signal of the test signal generating circuit 6 is input to the primary side of the transformer 1, it must be a signal of a large voltage. Therefore, the test terminal 1t is set in the transformer 1, and the test signal is generated. The test signal of the road 6 is input to the test terminal 1t. This eliminates the need for large voltages. Although the above description has been made on the case of using a transformer, the same applies to the case of using a current transformer.

As described above, the protective relay device of Embodiment 4 In the operation test system, the soundness of the protection relay device 400 can also be confirmed. According to this embodiment, it is also possible to confirm the soundness of the transformer 1 inside the protection relay device.

As described above, the first embodiment to the fourth embodiment have been described. However, the electronic components used in the protection relay device hardly deteriorate over time, and the operation of the protection function is performed by the software processing, so that the operation of the protection function hardly changes. Therefore, the third embodiment described in the first embodiment can be implemented periodically, once a year or once a month, as needed, in the first, second, fourth, and fifth embodiments described in the first embodiment. In other words, since the purpose is to detect the abnormality of the analog measuring circuit 3, the abnormality of the protective relay device can be immediately detected through the usual execution. In addition, the present invention is not limited to the embodiments, and the respective embodiments can be freely combined, and the application, changes, and omissions of the respective embodiments can be made.

1‧‧‧Transformer

2‧‧‧Toggle switch

3‧‧‧ analog measuring circuit

4‧‧‧ Analog/Digital Converter

5‧‧‧CPU

5a‧‧‧Protection/Monitoring and Processing Department

6‧‧‧Test signal generation circuit

100‧‧‧Protection relay device

Claims (10)

An action test system for protecting a relay device detects a system abnormality, and the electrical equipment of the protection system is not affected by the system abnormality. The action test system of the protection relay device has: receiving an input signal from the system and outputting an analog measurement value And an analog measuring circuit; an analog/digital converter that converts the analog analog output value outputted from the analog measuring circuit into a digital signal; a test signal generating circuit that generates a test signal for the protection relay device; and the protection relay a switching switch for switching the test signal and an input signal from the system in the front stage of the analog measuring circuit of the device; taking in the digital signal from the analog/digital converter as an input, and performing the protection relay device a protection calculation and a CPU that is issued according to an instruction of protection or control of the calculation result, and controls a switching timing of the switching switch; and compares the aforementioned test signal input through the analog measurement circuit and the analog/digital converter, and the test signal from the test signal Generating circuit directly The of the test signal, to determine the presence or absence of abnormality of protection / monitoring unit, and alternately for the test signal from said analog / digital converter and the input signal from the system according to the sampling to monitor the presence or absence of findings. An action test system for protecting a relay device detects a system abnormality, and the electrical equipment of the protection system is not affected by the system abnormality. The action test system of the protection relay device has: receiving an input signal from the system and outputting an analog measurement value And an analog measuring circuit; an analog/digital converter that converts the analog analog output value outputted from the analog measuring circuit into a digital signal; a test signal generating circuit that generates a test signal for the protection relay device; and the protection relay a switching switch for switching the test signal and an input signal from the system in the front stage of the analog measuring circuit of the device; taking in the digital signal from the analog/digital converter as an input, and performing the protection relay device a protection calculation and a CPU that is issued according to an instruction of protection or control of the calculation result, and controls a switching timing of the switching switch; and compares the aforementioned test signal input through the analog measurement circuit and the analog/digital converter, and the test signal from the test signal Generating circuit directly Entering the test signal to determine whether there is an abnormality of the protection/monitoring processing unit, and interactively detecting the test signal from the analog/digital converter at intervals of one cycle or less of the current or voltage to be monitored by the system The aforementioned input signals from the aforementioned system are sampled. An action test system for protecting a relay device detects an abnormality of the system, and the electrical equipment of the protection system is not affected by the system abnormality. The action test system of the protection relay device has a plurality of input signals for converting the input signals from the system. a test signal generating circuit for generating a test signal for the protection relay device; a front stage of each type of ratio measurement circuit provided in the plurality of analog measurement circuits provided in the protection relay device, switching the test signal and coming from a switching switch for input signals of the converters of the plurality of converters; and a CPU for controlling a switching timing of the switching switches, and interactively testing signals for the test signal generating circuit and converters from the plurality of converters The input signal is sampled. The action test system for protecting a relay device according to any one of claims 1 to 3, wherein the test signal generating circuit generates a DC signal in accordance with an instruction from the CPU, and an instruction from the CPU And the DC signal generated by the test signal generating circuit to confirm the operation of the protection relay device. The action test system for protecting a relay device according to any one of claims 1 to 3, wherein the test signal is generated according to an instruction from the CPU The circuit generates a pulsed DC signal, and defines a pulse-shaped DC signal generation interval, a width of the pulsed DC signal, a magnitude of the pulsed DC signal, and an instruction from the CPU and the test signal generation circuit. The generated pulsed DC signal confirms the operation of the aforementioned protective relay device. The action test system for protecting a relay device according to any one of claims 1 to 3, wherein the test signal generating circuit generates a range from 0 to a measurable range in accordance with an instruction from the CPU. a pulsed DC signal that is enlarged, and defines a pulse-like DC signal generation interval, a width of the pulsed DC signal, and a magnitude of the pulsed DC signal, and is generated from the CPU command and the test signal. A pulsed DC signal generated by the circuit confirms the operation of the protection relay device. The action test system for protecting a relay device according to any one of claims 1 to 3, wherein the test signal generating circuit generates a pulse that becomes larger with each sampling in accordance with an instruction from the CPU. a DC signal, and defining a pulse-like DC signal generation interval, a width of the pulsed DC signal, and a magnitude of the pulsed DC signal, and generated by the CPU command and the test signal generating circuit A pulsed DC signal is used to confirm the operation of the aforementioned protective relay device. Protection relay as described in any one of claims 1 to 3 The operation test system of the device, wherein the test signal generating circuit generates a sine wave signal in accordance with an instruction from the CPU, and operates the size and frequency of the sine wave signal to be a predetermined value of the protective relay device. The action test system for protecting a relay device according to any one of claims 1 to 3, wherein the test signal generating circuit generates a sine wave signal according to an instruction from the CPU, and the sine wave is generated. The size and frequency of the signal are the predetermined values of the protection relay device, and the predetermined value is operated in the same manner as the input signal from the system. An operation test system for protecting a relay device according to any one of claims 1 to 3, comprising: a converter for obtaining an input signal from the system, and inputting a test signal of the test signal generating circuit to the foregoing The primary side of the converter.