KR102002846B1 - Verification system for protection element of generator and transformer digital protection relay, and verification method thereof - Google Patents

Abstract

The present invention relates to a digital protective relay protection element verification system. Provided is a generator and transformer digital protective relay protection element verification method, which comprises: a first step of starting a generator digital protective relay protection element verification method; a second step of confirming the confirmation of an operation of an element only by LCD, LED, and disturbance waveforms; and a third step confirming whether response characteristics in accordance with the disturbance waveforms of a protection element of the generator protective relays (130 including 130a and 130b).

Description

Verification system for protection element of generator and transformer digital protection relay, and verification method

The present invention relates to a digital protection relay protection element verification system and verification method, and more specifically, it is possible to prevent the accident in advance by trend management in the power generation system as well as generator digital protection relay protection elements, transformer digital The present invention relates to a digital protection relay protection element verification system and a verification method for verifying 100% protection relay protection elements.

Previous protective relays are mechanical and static types, each of which is a protective relay. That is, at present, most of the protection relays are digital protection relays, and there are several elements in one protection relay. A big advantage of digital protective relays is that they can be used to analyze accidents with measurement and disturbance waveforms. It is possible to prevent accidents in the power generation system by managing trends periodically with measurement and record waveforms while the generator is in operation.

"Generator protection elements" consist of a combination of directional and non-directional protection elements, which include differential generators for generators (87G), short or ground fault relays (21), field loss relays (40), and Volt per Hertz (24). In addition, there are approximately 10 to 17 AC power relays 32 and the like, and there are elements that operate only when a condition is satisfied when operating a protection element.

Directional and non-directional protection elements are also included in the transformer transformer elements.The differential transformer, unit overall, unit aux side differential relay (87T), two winding transformer, three winding transformer and current differential relay (87TN), short circuit and ground fault There are protection elements such as an AC overcurrent relay (50/51) operating at a selective relay / overcurrent, a short circuit and ground fault selection relay / neutral point OCR (50 / 51N).

It is difficult to verify 100% with the general test methods such as pick-up test, time test, and ratio characteristic test that use "generator protection relay" and "transformer protection relay" protection elements.

For that reason, first, the generator does not actually establish the rated operating conditions and apply the current and voltage calculated as the secondary value to the protective relay with the test equipment to verify the operation and measurement. The transformer also does not actually verify its operating condition and measurement by applying rated six-phase current to the protective relay as a test equipment by actually making rated operating conditions.

Second, after implementing Free Fault and Fault as a test equipment, the protection relay does not check whether it is the same as fault fault waveform. Third, when the protective relay is tested, the test is performed to check the operating part, but the part that does not operate in the normal state is often not checked.

Korean Patent Application No. 10-2015-0060753 "MOTOR PROTECTION RELAY FOR DETECTING RESISTIVE GROUND FAULT CURRENT"

The present invention is to solve the above problems, to make the actual rated operating conditions for the protection element of the generator protection relay which is the most important element of the protection relay to protect the power system equipment to the test equipment secondary value to the protective relay side Not only can you check the operating status and measurement by applying the calculated current and voltage, but also you can check the disturbance waveform individually to check the parts that are not working in the normal state for each protection element. It is to provide a digital protection relay protection element verification system.

In addition, the present invention is a digital protection to enable the verification of the protection element to prevent the frequent occurrence of malfunction in the case of completing the protective relay individual test in the transformer protection relay as well as the generator protection relay It is to provide a relay protection element verification system.

However, the objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

Generator and transformer digital protection relay protection element verification method according to an embodiment of the present invention to achieve the above object, "generator protection relays 130: 130a, 130b formed on the digital protection relay protection element verification system 100; In order to confirm ", connect the generator protection relay to the binary input side according to the operating conditions, and then, in the secondary test at the current test terminal (CTT) 110 and the voltage test terminal (PTT) 120, A first step of performing a generator digital protective relay protection element verification method after applying a phase rated current and a three phase rated voltage; Protective relay After checking that no protective elements operate in the ON state of all protective elements, and if all protective elements are ON, the test equipment is used to operate only one protective element corresponding to the test object. A second step of applying a voltage to confirm that only the element is operating in the protection relay with LCD, LED, and disturbance waveforms; And the response according to the disturbance waveform of the protection elements of the generator protection relays 130: 130a and 130b in the case of applying the voltage, current magnitude, phase, and frequency to the generator protection relays 130: 130a and 130b. A third step of checking whether the characteristics are the same; Characterized in that it comprises a.

In addition, the generator and transformer digital protection relay protection element verification method according to another embodiment of the present invention to achieve the above object, "transformer protection relay 140: 140a formed on the digital protection relay protection element verification system (100a). , 140b, 140c) " a first step of applying a six-phase current to a Full Load Current value with Secondary Injection and then performing a method of verifying a transformer digital protection relay protection element; Protective relay After confirming that no protective elements operate in the ON state of all protective elements, when only one protective element to be tested with the test equipment is allowed to operate when all the protective relays are ON, A second step of confirming that only the element is operated by LCD, LED, and Disturbance waveform; And a third to check whether the response characteristics according to the disturbance waveforms of the protection elements of the transformer protection relays 140: 140a, 140b, 140c are the same when the magnitude, phase, and frequency of the current are varied and applied to the protection relay. step; Characterized in that it comprises a.

The test equipment used in the generator and transformer digital protection relay protection element verification method according to an embodiment of the present invention to achieve the above object, the generator side current, voltage and transformer side to the record equipment when actually operating in the power system Record the current waveform to waveform during the test and measure the voltage at the comparison and CT terminal side to prevent the accident prevention in the power generation system periodically by trend management. The waveform includes the magnitude, phase and frequency. It can be seen as a measurement on the protection relay, which is characterized by checking the generator output and operating conditions in the monitoring room when measuring the record waveform.

Digital protection relay protection element verification system according to an embodiment of the present invention, by making the actual rated operating conditions for the protection element of the generator protection relay which is the most important element of the protection relay to protect the power system equipment to the protective relay side as test equipment Not only can you check the operating status and measurement by applying the current and voltage calculated as the secondary value, but also check the disturbance waveform individually to check the parts that are not working in the normal state for each protection element. Provide possible effects.

In addition, the digital protection relay protection element verification system according to another embodiment of the present invention, in addition to the generator protection relay, as well as the transformer protection relay in general prevents frequent occurrence of malfunction when completing the protection relay individual test Verification of protective elements to ensure that the effect is possible.

1 is a diagram illustrating a case of a generator protection relay 130 (130a, 130b) of the digital protection relay protection element verification system 100 according to an embodiment of the present invention.
2 is a flowchart illustrating a verification method for a generator protection relay 130 (130a, 130b) of the digital protection relay protection element verification system 100 according to an embodiment of the present invention.
3 is a diagram illustrating a case in which a transformer protection relay 140 (140a, 140b, 140c) is a digital protection relay protection element verification system 100a according to another embodiment of the present invention.
4 is a flowchart illustrating a verification method in the case of a transformer protection relay 140 (140a, 140b, 140c) of the digital protection relay protection element verification system 100a according to another embodiment of the present invention.

Hereinafter, the detailed description of the preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted when it is deemed that they may unnecessarily obscure the subject matter of the present invention.

In the present specification, when one component 'transmits' data or a signal to another component, the component may directly transmit the data or signal to another component, and through at least one other component. This means that data or signals can be transmitted to other components.

On the digital protective relay protection element verification systems 100 and 100a of FIGS. 1 and 3, all of the protective relay elements have been subjected to respective protection element characteristics tests such as pick-up, time, ratio characteristic test, B / I, and B / O. Proceed in one condition and can be applied to all generator and transformer digital protective relays. At this time, the B / O check should confirm whether the contact operation to the test equipment 200.

On the digital protective relay protection element verification system (100, 100a), it is necessary to check whether the equipment, drawings, and correction statements installed on the site are identical.The CT Star point provides the connection status provided by the protection relay companies and the CT Star point installed on the site. You need to make sure it's the same. In this case, the CT Star point is different for each protection relay company, so it is necessary to confirm it in the manual.

1 is a diagram illustrating a case of a generator protection relay 130 (130a, 130b) of the digital protection relay protection element verification system 100 according to an embodiment of the present invention.

Referring to FIG. 1, the generator protection relay 130 may include a MAIN protection relay 130a and a BACK-UP protection relay 130b, and the MAIN protection relay 130a may include components 25, 21, 27, and the like. 78, 59, 51P, 24T, 46A, 24A, 46T, 81U, 59BF, 81O, 50 / 62BF, 40-1,2, 50/27, 32-1, 87G, 64TN, 59N. BACK-UP protective relay 130b is the same as component except for 21, 27, 78, 59, 51P, 24T, 46A, 24A, 46T, 81U, 59BF, 81O, 50 / 62BF, 40-1, 2, 50/27, 32-1, 87G, 64TN, 59N. On the other hand, the generator protection element to be used in one embodiment, may vary slightly depending on the site.

To check the "generator protection relays 130: 130a, 130b" formed on the digital protection relay protection element verification system 100, the protection relay binary input (Binary Input) according to the generator operating conditions with the data shown in the correction statement. After connecting to the side, apply the 6-phase rated current, 3-phase rated voltage to the secondary injection from the current test terminal (CTT) (110), voltage test terminal (PTT) (120) side, the generator and Transformer digital protective relay protection element verification method can be performed. At this time, the protection elements of all generator protection relays 130 (130a and 130b) should be in an ON state or an enabled state.

In the first condition, the protection relay should be injected into the test equipment 200 in the ON state of all the protection elements to check whether any protection elements are operating in the generator protection relays 130: 130a and 130b. .

Second, the CT & PT Ratio is corrected by injecting current and voltage into the protective relay with the test equipment 200, and the primary and secondary values should be measured normally (current, voltage, power, frequency, etc.). Generator protection relays (130: 130a, 130b) should be checked.

Third, injecting the current and voltage to the protection relay side with the test equipment 200, the differential current in the protection elements of the generator protection relays (130: 130a, 130b) including 87G should be measured as 0A (ampere) and suppressed The current shall be measured at the generator rated current value.

Fourth, the test equipment 200 is fixed to the end-side three-phase current magnitude and phase of the digital protection relay protection element verification system 100, fixed to the line-side three-phase current magnitude and only the phase is changed to the left and right When the phases are the same size, it is checked whether the protection elements of the generator protection relays 130 (130a and 130b) are operated. At this time, it is possible to check whether the power values are also operated at the same size.

Fifth, the test equipment 200 is fixed on the line-side three-phase current magnitude and phase of the digital protective relay protection element verification system 100, and fixed on the end-side three-phase current size and only the phase is changed left and right, When the phases are the same size, it is checked whether the protection elements of the generator protection relays 130 (130a and 130b) operate, and at this time, it is possible to check whether the power values also operate at the same size.

Sixth, the test equipment 200 applies the current and voltage to operate only one element to be tested by the test equipment when all the elements of the protective relay are ON. Check with LED, Disturbance Waveform. In this case, all elements are applied equally. In some cases, the two relays operate simultaneously due to the difference of the protective relay correction values.

Seventh, when the voltage, current magnitude, phase, and frequency in the test equipment 200 are applied to the protection relays (130: 130a, 130b), it is checked whether the same is true in the measurement and disturbance of the protection relay.

2 is a flowchart illustrating a verification method for a generator protection relay 130 (130a, 130b) of the digital protection relay protection element verification system 100 according to an embodiment of the present invention.

Referring to FIG. 2, the test equipment 200 checks the generator protection relays 130: 130a and 130b formed on the digital protection relay protection element verification system 100. After wiring according to the operating conditions on the side, apply the 6-phase rated current and 3-phase rated voltage by the secondary injection from the current test terminal (CTT) 110 and the voltage test terminal (PTT) 120, Start performing the protection relay protection element verification method (S11).

After the step (S11), it is checked whether the operation of the protection element constituting the generator protection relay (130: 130a, 130b) by injecting current, voltage to the test equipment 200 (S12).

After the step (S12), the CT and PT Ratio is corrected by injecting current and voltage into the test equipment 200, and the primary and secondary values are normally measured (current, voltage, power, frequency, etc.) and checked (S13). ).

After the step (S13), the current and voltage is injected into the test equipment 200 to measure the difference current is 0A (ampere) in the generator protection element, it is checked whether the suppression current is measured by the generator rated current value (S14).

After the step (S14), the test equipment 200 is applied to the protective relay by applying current and voltage to operate only one protective element corresponding to the test object when the protective relay is in the ON state of all protective elements. Confirm that only the element is operating is confirmed by the LCD, LED and Disturbance waveform (S15).

After the step (S15), the test equipment 200 is fixed to the end side three-phase current magnitude and phase, the line-side three-phase current magnitude is fixed and only the phase is changed left and right so that the generator protection element operates when the phase is the same size Check whether (S16).

After step (S16), the test equipment 200 is fixed to the line-side three-phase current size and phase, the end-side three-phase current size is fixed and only the phase is changed left and right, the generator protection element operates when the phase is the same size Check whether it is (S17).

After the step (S17), the test equipment 200 is the generator protection relays (130: 130a, 130b) in the same way when applied to the generator protection relays (130: 130a, 130b) by varying the magnitude, phase and frequency of the voltage, current Verify that the response characteristics according to the disturbance waveforms for the protection element are the same (S18).

3 is a diagram illustrating a case in which a transformer protection relay 140 (140a, 140b, 140c) is a digital protection relay protection element verification system 100a according to another embodiment of the present invention. 3, the transformer protection relay 140 is a UNIT OVERALL protective relay 140a, STEP-UP TR protective relay 140b, AUX. TR protection relay 140c may include, UNIT OVERALL protective relay 140a is composed of 87TU, STEP-UP TR protective relay 140b is composed of 51N, 50/51, 87TN, 87T, AUX. The TR protection relay 140c may be configured of 87T, 50/51, 87TN, and 51N.

Meanwhile, in order to check the "transformer protection relays 140 (140a, 140b, 140c)" formed on the digital protection relay protection element verification system 100a, the six-phase current is fully loaded by secondary injection with the data shown in the correction statement. After applying as the current value, the verification method of the transformer digital protection relay protection element can be performed through the following conditions. In this case, all protection elements must be in the ON or Enable state.

In the first condition, when the current is injected into the test equipment 200, any of the protection elements of the transformer protection relays 140: 140a, 140b, 140c should not operate. , 140b, 140c).

Second, the CT ratio is corrected when the current is injected into the test equipment 200. The protection relay (140: 140a, 140b, 140c) should have the primary value and the secondary value normally measured (current). You should check at

Third, when the current is injected into the test equipment 200, the differential current should be measured as 0 A in the protection element of the transformer protection relay 140 including the peripheral voltage differential relay 87T element and the suppression current is the transformer rated current. It should be measured by value.

Fourth, when the current is injected into the test equipment 200, the three-phase current magnitude and phase of the low voltage (LV) side and the three phase current magnitude of the high voltage (HV) side of the digital protection relay protection element verification system 100a are fixed. It can be fixed, and only the phase is changed left and right, so that the protection elements of the transformer protection relays 140: 140a, 140b, 140c including the peripheral voltage differential relay 87T protection elements operate when the phases are the same size. .

Fifth, when the current is injected into the test equipment 200, the three-phase current size and phase of the high voltage (HV) side and the three phase current size of the low voltage (LV) side of the digital protective relay protection element verification system 100a are fixed. It can be fixed, and only the phase is changed left and right, so that the protection elements of the transformer protection relays 140: 140a, 140b, 140c including the peripheral voltage differential relay 87T protection elements operate when the phases are the same size. .

Sixth, when all elements of the protective relay are in the ON state, only one element to be tested by the test equipment is allowed to operate and the LCD, LED, and disturbance waveforms confirm that only the element has been operated in the protective relay. In this case, all elements are applied equally. However, when testing 50/51 elements, test after turning off 87T element.

Seventh, when the magnitude, phase, frequency of the test equipment 200 is applied to the protection relay side to check whether the same in the disturbance of the protection relay.

4 is a flowchart illustrating a verification method in the case of a transformer protection relay 140 (140a, 140b, 140c) of the digital protection relay protection element verification system 100a according to another embodiment of the present invention. Referring to FIG. 4, the test equipment 200 uses a secondary injection to check the "transformer protection relays 140: 140a, 140b, 140c" formed on the digital protection relay protection element verification system 100a. After applying the full load current value, the transformer digital protection relay protection element verification method starts to be performed (S21).

After the step (S21), when the current is injected into the test equipment 200 to check whether the protective element constituting the transformer protection relay 140 (140A, 140b, 140c) operation (S22).

After the step (S22), it is checked that the CT ratio is corrected when the current is injected into the test equipment 200, the primary value and the secondary value are normally measured (current) (S23).

After the step (S23), when the current is injected into the test equipment 200, the differential current in the transformer protection element is measured to 0A (ampere), it is checked whether the suppression current is measured by the transformer rated current value (S24).

After step (S24), when all the elements of the protection relay are ON, only one protection element to be tested by the test equipment is allowed to operate, and the operation of the protection relay is confirmed by LCD, LED, and Disturbance waveform. (S25).

After the step (S25), when injecting current into the test equipment 200, the three-phase current magnitude and phase of the low voltage (LV) side is fixed, the three-phase current magnitude of the high voltage (HV) side is fixed and only the phase is changed to the left and right When the phase is the same size, check whether the protection element of the transformer protection relay operates (S26).

After the step (S26), when injecting the current to the test equipment 200, the three-phase current size and phase of the high voltage (HV) side is fixed, the three-phase current size of the low voltage (LV) side is fixed and only the phase is changed to the left and right When the phase is the same size, check whether the protection element of the transformer protection relay operates (S27).

After the step (S27), the test equipment 200, when applied to the protection relay side by varying the magnitude, phase, frequency of the current disturbance waveform for the protection elements of the transformer protection relay (140: 140a, 140b, 140c) Check whether the response characteristics according to the same (S28).

The invention can also be embodied as computer readable code on a computer readable recording medium. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system.

Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and the like, which are also implemented in the form of carrier waves (eg, transmission over the Internet). It also includes.

The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. And functional programs, codes and code segments for implementing the present invention can be easily inferred by programmers in the art to which the present invention belongs.

As described above, the present specification and drawings have been described with respect to preferred embodiments of the present invention, although specific terms are used, it is only used in a general sense to easily explain the technical contents of the present invention and to help the understanding of the present invention. It is not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

100, 100a: Digital protection relay protection element verification system
110: current test terminal (CTT)
120: voltage test terminal (PTT)
130: generator protection relay
130a: MAIN protective relay
130b: BACK-UP protective relay
140: transformer protection relay
140a: UNIT OVERALL Protective Relay
140b: STEP-UP TR protective relay
140c: AUX. TR protective relay
200: test equipment

Claims (3)

As a verification method of the digital protection relay protection element verification system 100 for confirming a generator protection relay including a MAIN protection relay and a back-up protection relay,
In order for the test equipment 200 to check the generator protection relays 130: 130a and 130b formed on the digital protection relay protection element verification system 100, the generator protection relay binary according to the operating conditions based on the data in the correction statement. After connecting to Binary Input side, apply 6-phase rated current and 3-phase rated voltage by Secondary Injection from current test terminal (CTT) 110 and voltage test terminal (PTT) 120 side. A first step of performing a digital protective relay protection element verification method;
A second step in which the test equipment 200 injects current and voltage to check whether the protection device constituting the generator protection relay 130 is operated;
The third step of confirming that the CT & PT Ratio is corrected by injecting current and voltage into the test equipment 200, and that the primary and secondary values are normally measured (current, voltage, power, and frequency are measured) ;
Is the test equipment 200 injecting current and voltage to determine whether the differential current is measured as 0 A (ampere) in the protection elements of the generator protection relays 130: 130a and 130b, and whether the suppression current is measured to the generator rated current value. A fourth step of identifying each;
The test equipment 200 applies a current and voltage to operate only one protection element corresponding to the test object among all protection elements of the generator protection relays 130: 130a and 130b. A fifth step of confirming, by means of LCD, LED, and Disturbance waveforms whether only that element has been operated in 130b);
When the test equipment 200 fixes the end side three-phase current magnitude and phase, and the line side three-phase current magnitude is fixed, and only the phase is changed to the left and right, the generator protection relay (130: 130a) A sixth step of confirming that the protection element of operation 130b operates;
When the test equipment 200 fixes the line-side three-phase current size and phase, and the end-side three-phase current size is fixed, only the phase is changed left and right so that the generator protection relay (130: 130a) A seventh step of confirming that the protection element of operation 130b operates; And
When the test equipment 200 is applied to the generator protection relay (130: 130a, 130b) by varying the magnitude, phase, frequency of voltage, current, the protection of the generator protection relay (130: 130a, 130b) An eighth step of checking whether the response characteristic according to the disturbance waveform for the element is the same; Including,
In the first step, the protection element of the generator protective relay 130 (130a, 130b) is ON (ON) or enabled state,
The sixth step and the seventh step is a generator digital protection relay protection element verification method, characterized in that to check whether the power value is the same size, respectively.
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