JP2531988B2 - Transformer protection relay device test equipment and test method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a testing device and a testing method for a transformer protection relay device incorporating a transformer protection relay for electrically protecting a transformer.

[Prior Art] A transformer protection relay as shown by A, B and C in Fig. 3 is known which is connected to a main circuit for electrically protecting a power transformer. 10 in this FIG.
Reference numeral 0 denotes a transformer protection relay device including the transformer protection relays A, B, and C, in which the primary current of the two-winding transformer Tr provided in the three-phase main circuit MC is supplied to the current transformers BCT1 to BCT3. And the secondary current is measured via the current transformers CT1 to CT3, and when the vector difference between the primary current and the secondary current exceeds the planned value for each phase, the transformer corresponding to each phase Device protection relay A,
Wired so that B and C are activated. However, in FIG. 3, TT11 and TT12 are primary current input terminals for testing of the transformer protection relay device 100 for inputting the secondary currents of the current transformers BCT1 to 3, and TT2 is a secondary current of the current transformers CT1 to CT3. It is a secondary current input terminal for testing that inputs current. CCT1 to CCT3 are auxiliary current transformers that adjust the phase of the primary current of each phase of the main circuit input via the current transformers BCT1 to BCT3. Furthermore, TP1 to 3 are overcurrent relays provided for each phase on the secondary side of the current transformers BCT1 to BCT3.

Conventionally, the test whether or not this type of transformer protection relay is correctly connected to the main circuit is conducted in order to avoid a situation in which the main circuit is cut off under a large load and the power demand is low. For example, a current of about 30% of the rated load is applied to the main circuit in time.

[Problems to be Solved by the Invention] However, in the test by the conventional method as described above, the connection state between the main circuit and the transformer protection relay can be tested, but the operation test of the transformer protection relay itself is not However, there was a problem that the test current was too small to carry out a correct test in practice even if it was attempted. For this reason, the operation test of the transformer protection relay itself must be performed by directly inputting the current to the input terminal of the transformer protection relay, and in a three-phase power source, etc., each transformer protection relay corresponding to each phase is tested. Had to do an individual test. Therefore, there is a problem that the test is troublesome and that the test cannot be performed in an operating state according to the actual condition.

The present invention has been made in view of the above circumstances, and of course, it is possible to test the quality of the connection state between the transformer protection relay and the main circuit, as well as to accurately perform the operation test of the transformer protection relay itself in the operating state in conformity with the actual situation. It is an object of the present invention to provide a testing device and a testing method for a transformer protection relay device that can be used in the above.

[Means for Solving the Problems] In order to achieve the above object, the test device of the transformer protection relay device according to the present invention is sufficiently smaller than the rated voltage of the main power source on the primary side of the transformer disconnected from the main power source. A test power supply unit that applies a test voltage, and a test current that is input to the transformer protection relay device when the test voltage is applied to the transformer primary side is measured and the current value is measured. And a phase data storage unit, a synthesizer that reproduces a test current based on the test current data stored in the measurement unit, and a current amplifier that amplifies the output of the synthesizer to form an actual load equivalent current. And a section.

Further, the test method of the transformer protection relay device according to the present invention is such that the main circuit is cut off from the power source, and then the secondary side of the transformer of the main circuit is short-circuited, and then a test voltage sufficiently smaller than the rated voltage is applied to the main circuit. Is applied to measure each test current flowing in the input terminal of the transformer protection relay device, the transformer protection relay device is disconnected from the main circuit, and then the actual load equivalent current obtained by amplifying the test current is applied to the transformer protection relay device. It is characterized in that the operation test of the transformer protection relay is performed by inputting it to the input terminal of.

[Operation] According to the test device for the transformer protection relay device of the present invention, when a test voltage sufficiently smaller than the rated voltage of the main power source is applied from the test power source unit to the transformer primary side, the transformer primary side and the secondary side The test current flowing to the next side is measured by the measuring unit,
The current value and phase data are stored. Then, the synthesizer reproduces the test current based on the test current data stored in the measuring section, and the reproduced test current is amplified by the current amplifier section to form an actual load equivalent current. By inputting the actual load equivalent current thus formed to the input terminal of the transformer protection relay device, it is possible to perform an operation test of the transformer protection relay itself in a state in which it is actually used.

Further, according to the method for testing the transformer protection relay device according to the present invention, the connection between the transformer protection relay device and the main circuit and the current ratio of the current transformer are tested with a small test current corresponding to the test voltage, Further, by inputting a small current equivalent to an actual load to the input terminal of the transformer protection relay device, it is possible to perform an operation test of the transformer protection relay and improve the reliability of the test.

[Embodiment] FIG. 1 shows a transformer protection relay device 10 provided to electrically protect a two-winding transformer Tr provided in a main circuit MC.
0 and this transformer protection relay device to do its test 1
The test apparatus 1 connected to 00 is shown. The transformer protection relay device 100 shown in FIG. 1 is the same as that shown in FIG. 3 described above, but in FIG. 1 the input terminals TT11, TT12 in FIG. Only the primary current input terminal for testing T1 and the secondary current input terminal for testing T2 are collectively shown, and their internal connections are omitted.

The test apparatus 1 includes a connection test unit 2 for testing a connection state between each of the transformer protection relays A, B, C (see FIG. 3) included in the transformer protection relay device 100 and the main circuit MC, and each transformer protection. An operation test unit 3 for performing an operation test of the relays A, B, C.

The connection test apparatus 2 includes a test power supply section 21 and a measurement section 22.

The test power supply unit 21 is a power supply unit for applying a test voltage sufficiently smaller than the rated voltage of the main power supply to the transformer primary side in a state where the transformer primary side of the main circuit MC is cut off from the main power supply. . The voltage output from the test power supply unit 21 is, for example, a transformer.
It can be set to 200V when the rated voltage on the primary side of the Tr is 77kV.

The measuring unit 22 includes a multimeter 22a, a personal computer 22b, and a printer 22c.

The multimeter 22a is connected to the main circuit M by the test power supply unit 21.
When a test voltage is applied to C, the test current flowing through the input terminals T1 and T2 and the input terminals c1, c2 and c4 of the transformer protection relays A, B and C in FIG. The test current, and further the reference voltage of the test power supply section 21 and the test current flowing through the supply line thereof are measured and the effective value, phase, frequency and the like are displayed. Each effective value and phase is current
It is obtained by sampling the voltage in a predetermined cycle and processing it.

The personal computer 22b is the rated value of the transformer Tr and the current transformer BCT.
Effective value and phase data of the test current by calculation obtained by arithmetically processing the data such as the transformation ratio of 1 to 3, and effective value and phase data of each measured test current input from the multimeter 22a. And are compared, and the quality of the connection is determined by the comparison determination value. At the same time, the personal computer 22b stores, in the floppy disk 22ba, the data of the effective value / phase of the test current calculated and measured, and the result of the quality judgment. Further, the effective value / phase data and the pass / fail judgment result can be printed by the printer 22c.

According to the connection test apparatus 2 as described above, the main circuit MC
Is cut off from the main power supply, and then the secondary side of the 2-winding transformer Tr is short-circuited with three phases, and then a test voltage sufficiently smaller than the rated voltage supplied from the test power supply unit 21 is applied to the main circuit MC. Thus, the effective value and phase of each test current as described above can be obtained. Then, by comparing the effective values and phases of these measured test currents with the effective values and phases of the calculated test currents calculated by the personal computer 22b, the transformation ratios, polarities and currents of the current transformers BCT1 to BCT3 are compared. Between transformers BCT1 to 3 and transformer protection relay device 100, transformer protection relay device 1
It is possible to find defects such as wiring inside 00.

On the other hand, the operation test section 3 synthesizes a simulated test current based on arbitrary effective value and phase data.
And a current amplifier section 32 for amplifying this simulated test current into an arbitrary simulated actual load current. As the effective value and phase data to be input to the synthesizer 31 as described above, the input terminal T1 (TT11, T11) stored in the floppy disk 22ba is stored.
When the effective value and the phase data of the measured test current for each phase in T12) and T2 are adopted, each measured test current waveform is reproduced based on these data instead of the simulated test current. Further, in this way, the test current waveform for each phase reproduced by the synthesizer 31 is amplified stepwise by the current amplifier section 32 to, for example, 150% of the rating,
An actual load equivalent current is formed instead of the simulated actual load current. Of course, these synthesizer 31 and current amplifier section
It is necessary that 32 is provided with the number of circuits capable of outputting the simulated actual load current or the actual load equivalent current to the terminals of each phase of the test current terminals T1 (TT11, TT12) and T2, and therefore, the third circuit. Transformer protection relay device 100 as shown
In the case of, at least 9 circuits corresponding to 3 phases and 3 circuits are equipped. The synthesizer 31 is a transformer protection relay.
It is preferable that the operation of itself can be stopped by inputting the operation signals of A, B, and C.

With the operation test section 3 as described above, the operation test of the transformer protection relays A, B, C can be performed as follows.

First, the data of the effective value and the phase of each test current stored in the floppy disk 22ba is taken out through the personal computer 22b, and the transformer protection relay device 100 is disconnected from the main circuit MC. Based on the actual load equivalent current formed on the basis of this transformer protection relay device 100
Input to the test current terminals T1 (TT11, TT12) and T2. In this way, by changing the magnitude of each actual load equivalent current input to the test current terminals T1 (TT11, TT12), T2,
It is possible to test whether the settling of transformer protection relays AB, C is correct. That is, transformer protection relays A, B, C
However, if it does not work despite inputting the actual load equivalent current that should naturally operate, or on the contrary it operates even if inputting the actual load equivalent current that does not need to operate. Means that the settling is incorrect.

In the above description, the case of testing the protection relay device of the two-winding transformer was described, but the transformer protection relay device 100 'for protecting the three-winding transformer Tr' as shown in FIG. 2 was tested. Also, when performing a wiring test, the number of test currents measured at the input terminals of the transformer protection relay device and the input terminals of each transformer protection relay during the connection test, and the simulated actual load current or actual load formed during the operation test. By simply increasing the number of equivalent currents, the test can be performed in substantially the same manner as in the above case.

[Effects of the Invention] As described above, according to the test apparatus and the test method of the present invention, the test reproduced based on the data of the effective value and the phase of the small test current corresponding to the test voltage sufficiently smaller than the rated voltage. Since the actual load equivalent current can be formed by amplifying the current, the actual load equivalent current is input to the input terminal of the transformer protection relay device to actually perform the operation test of the transformer protection relay itself. In addition to being able to test the quality of the connection state between the transformer protection relay and the main circuit, it is also possible to accurately perform the operation test of the transformer protection relay itself, and therefore, it is possible to perform reliable testing. The effect that a highly reliable test can be implemented is exhibited.

[Brief description of drawings]

Fig. 1 is a block diagram showing the operation of the test equipment for a transformer protection relay device for a two-winding transformer, Fig. 2 is a single wire connection diagram of a three-winding transformer and a transformer protection relay, and Fig. 3 is a transformer. It is a wiring diagram of a protection relay device. 21 …… Test power supply section 22 …… Measuring section 31 …… Synthesizer 32 …… Current amplifier section 100 …… Transformer protection relay device A, B, C …… Transformer protection relay Tr …… 2-winding transformer (transformer vessel)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yukichi Makino 3-14-40 Senrioka, Settsu-shi, Osaka Prefecture Toko Seiki Co., Ltd. (72) Inventor Yoshinori Terakawa 3-14-40 Senrioka, Settsu-shi, Osaka Prefecture Toko Seiki Co., Ltd. (56) Reference JP-A-52-40748 (JP, A) JP-A-56-79265 (JP, A)

Claims (2)

(57) [Claims] Claim: What is claimed is: 1. A transformer protection relay device comprising a transformer protection relay, which measures current values on a primary side and a secondary side of a transformer of a main circuit and operates to protect the transformer based on these current values. The test power supply unit that applies a test voltage that is sufficiently smaller than the rated voltage of the main power source to the transformer primary side that is cut off from the main power source, and the test voltage is applied to the transformer primary side. When measuring the test current of the transformer primary side and secondary side, which is input to the transformer protection relay device, and storing the current value and phase data, a test current data stored in the measuring unit. A test apparatus for a transformer protection relay device, comprising: a synthesizer that reproduces a test current based on the above, and a current amplifier unit that amplifies the output of the synthesizer to form an actual load equivalent current. 2. A transformer protection relay device provided with a transformer protection relay that operates to take out the current values of the transformer primary side and the secondary side of the main circuit, respectively, and operate to protect the transformer based on these current values. In the test method of (1), the main circuit is cut off from the power supply, the transformer secondary side of the main circuit is short-circuited, and then a test voltage that is sufficiently smaller than the rated voltage is applied to the main circuit. After measuring each test current flowing through the input terminal of the device and disconnecting the transformer protection relay device from the main circuit, the actual load equivalent current obtained by amplifying the test current is input to the input terminal of the transformer protection relay device and transformed. A test method for a transformer protection relay device, which comprises performing an operation test of a transformer protection relay.