JP3234901B2 - Protection relay / breaker test system and tester used for same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protective relay and a circuit breaker.
Relay / breaker test system for testing with
And a tester .

[0002]

2. Description of the Related Art In a factory of each business site, if there is a machine short-circuit accident or the like in the factory and an excessive current is applied to the machine side, it is dangerous. In such a case, a breaker (CB) provided on a transmission line or a distribution line is operated by the output of the protective relay to cut off the current. Then, for example, once a year, equipment including a protective relay and a circuit breaker used for breaking a transmission line or a distribution line is tested.

Here, since the output contact of the protection relay is connected to the trip coil (CB coil) of the circuit breaker, when a test current is applied to the protection relay, for example,
In the circuit breaker interlock test for testing whether the circuit breaker operates within a predetermined time, the operation time of the protection relay alone cannot be measured together.

For this reason, conventionally, a test of a protection relay alone and a test of circuit breaker interlocking must be performed separately.
That is, the wiring between the output contact of the protective relay and the trip coil of the circuit breaker is disconnected, a tester is connected to the output contact of the protective relay, the operating time of the protective relay alone is measured, and Are connected again, and the auxiliary contacts of the circuit breaker are connected to the tester to measure the entire protective relay and circuit breaker, that is, the operation time of the circuit breaker interlocking. The operation time of the circuit breaker alone is calculated by reducing the operation time of the protection relay alone.

[0005]

However, in such a conventional example in which the test of the protection relay alone and the test of the interlock of the circuit breaker are separately performed, work such as disconnection and connection of wiring is required, and the number of tests is reduced. The time required for the test is long because it is two times, and the operation time of the protective relay alone and the operation time of the circuit breaker interlocking are not measured under the same conditions, so that the operation is performed correctly. There is a drawback that time cannot be measured.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to enable simultaneous testing of a protective relay alone and test of interlocking with a circuit breaker.

[0007]

SUMMARY OF THE INVENTION The protective relay / shield of the present invention is provided.
Sectional device test system in order to achieve the above object, protective
The protection relay is constructed by a relay, a circuit breaker, and a tester.
The electric appliance has an input unit to which a test current is supplied, and the circuit breaker.
Internal relay including the output contact connected to the trip coil
A test contact interlocked with the output contact,
The test terminal that outputs the operation signal of the test contact and the set value
Setting section for setting, and setting set in the setting section
Compare the value with the test current supplied from the input terminal
When the test current exceeds the set value, the first internal relay
And a CPU that controls the output contacts to be turned on by driving the
The circuit breaker turns on and off the output contact of the protection relay.
The trip coil operates by force and turns on accordingly
An auxiliary contact, wherein the tester is connected to the protective relay.
Generates current to supply test current to input terminals
Current from the current generator and the test terminal of the protective relay.
The first input terminal for inputting the motion signal and the connection cable
A second input for inputting an auxiliary contact output from the circuit breaker through the second input
Input the operation signal only from the power input terminal and the first input terminal.
If you apply a protective relay
Calculates the single operation time and outputs the operation signal from both input terminals.
And the auxiliary contact output are input,
Calculate circuit breaker interlocking operation time and shut off before
Subtract the protection relay unit operation time from the switch interlock operation time
By doing so, the CPU that calculates the breaker unit operating time
The connection cable between the tester and the circuit breaker
Each operation time is the same in one test depending on the presence or absence of
It is characterized in that it is sometimes measurable.
You.

[0008]

[0009]

According to the above configuration, the tester can simultaneously receive the output of the test contact corresponding to the output of the protective relay and the output of the auxiliary contact corresponding to the breaking operation of the circuit breaker, and can perform the test in one test. Thus, the operation time of the protection relay alone, the operation time of the circuit breaker interlock, and the operation time of the circuit breaker alone can be measured simultaneously.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram of a test system according to an embodiment of the present invention. A tester 2 according to this embodiment performs a test of a protection relay 1 and a circuit breaker 70 operated by an output of the protection relay 1. Is what you do.

The protection relay 1 includes a test electric quantity from the tester 2, in this embodiment, an input section 4 to which an alternating current is input, and a transmitting / receiving section 6 for transmitting and receiving information to and from the tester 2. ,
A CPU 8 for controlling each unit and performing an arithmetic operation and the like;
An output unit 10 that outputs by operation of a relay 26 based on a command operation from the PU 8, a setting unit 12 in which various set values are set, and a storage unit 14 that stores an operation program of the CPU 8, various test data, and the like. And a test circuit unit 16 provided corresponding to the output unit 10.

The output unit 10 includes an output drive circuit 18 that outputs a drive signal after a predetermined delay time in response to an output command signal from the CPU 8, a transistor 20 that is turned on by the drive signal from the output drive circuit 18, and a transistor 20.
, And an output contact 24 that is turned on when the drive coil 22 is excited. The drive coil 22 and the output contact 24 constitute a relay 26. The test circuit unit 16 is similarly operated by the drive coil 22 of the output unit 10, that is, is provided with a test contact 28 that is linked to the output contact 24. The output contact 24 of this protective relay 1
Is connected to the trip coil 71 of the circuit breaker 70 via the output terminal 42.

FIG. 2 is a partial front view showing a part of the front surface of the protection relay 1.
A test connector 30 is provided for connection to the test. In the test connector 30, a communication terminal 32 connected to the transmission / reception unit 6 and a test terminal 34 from the test circuit unit 16 are collectively arranged. As shown in FIG. 3, the input terminal 36 connected to the input unit 4 is pulled out to the outside, and a test terminal is provided below a portion of the sub-panel 38 on which the protective relay 1 is provided, where the protective relay 1 is provided. 40. The output terminal 42 connected to the output contact 24 is provided on the back surface of the protection relay 1.

The protection relay 1 usually has an input terminal 3
6, when a detection current is provided from a current detector provided in a transmission line or a distribution line, for example, and when the current value reaches a set value set by the settling unit 12, an output command signal is output from the CPU 8 to drive. By being supplied to the circuit 18, the drive coil 22 is driven to turn on the output contact 24, whereby a cutoff command signal is sent from the output terminal 42 to the trip coil 71 of the circuit breaker 70 provided on the power transmission line or the distribution line. To give.

The tester 2 has a CPU 50 for controlling each unit.
And a storage unit 51 for storing an operation program of the CPU 50 and various data, a current generation unit 52 for generating a test alternating current to be supplied to the protection relay 1, and transmission and reception for transmitting and receiving information to and from the protection relay 1. It comprises a unit 54, an input unit 56 to which an output signal from the protection relay 1 is input, a display unit 58 for displaying test result contents and the like, and an operation unit 60.

The tester 2 has an output terminal 72 for supplying an alternating current from the current generator 52 to the protection relay 1 and a communication terminal 73 for performing communication with the protection relay 1.
And an input terminal 74 to which the output of the test circuit section 16 of the protective relay 1 is provided and a three-terminal input terminal 76 to which the output of the auxiliary contact 75 of the circuit breaker 70 is provided.
have.

As described above, the tester 2 has the input terminal 74 to which the output of the test contact 28 is provided in conjunction with the output contact 24 of the protective relay 1 and the output of the auxiliary contact 75 corresponding to the breaking operation of the circuit breaker 70. Since the input terminal 76 is provided, an alternating current for test is supplied to the protection relay 1 to measure the operation time of the contacts 28 and 75, thereby protecting the protection relay 1 in one test. A relay unit and circuit breaker interlock test can be performed.

Therefore, it is not necessary to perform the work of disconnecting or connecting the wiring as in the conventional example, in which the test of the protection relay alone and the test of the interlock of the circuit breaker are separately performed, and the number of tests is one. The time required for the test will be greatly reduced. In addition, the operation time of the protection relay alone and the operation time of the circuit breaker interlock can be measured under the same condition, and the accurate operation time can be measured.

Further, the tester 2 of this embodiment determines whether the test is a test of the protection relay 1 alone or an interlock test including the circuit breaker 70 by connecting the input terminal 76 to the three terminals. Automatic determination is made based on whether or not the connection cable 77 is connected, and based on the determination, a corresponding time measurement is performed as described later.

That is, the tester 2 has an internal relay 80 in which a drive coil 78 is connected to one of the three input terminals 76 and an output contact 79 is connected to the input section 56. One of the input terminals 76 is connected to the ground of the internal circuit, and the other one is connected to the input unit 5.
6 is connected. On the other hand, two terminals of a three-terminal connection cable 77 connected to the input terminal 76 are connected to each other, and the other end of the connection cable 77 is connected to an auxiliary contact 75 of the circuit breaker 70. .

With such a configuration, the tester 2
When the connection cable 77 is connected to the input terminal 76, that is, in the state of FIG. 1, the internal relay 80 operates, thereby determining that the circuit breaker interlock test is performed.
When the connection cable 77 is not connected to the input terminal 76, the internal relay 80 does not operate.
This is to judge that the test is for the protection relay alone.

Next, the operation during the test will be described.

FIG. 3 is a diagram showing a test state of the protection relay by the tester 2. During the test, a current supply cable 62 from the tester 2 is connected to the test terminal 40 of the power receiving and changing panel 38, and the protection relay 1 is turned on. The contact confirmation cable 64 from the tester 2 is connected to the test connector 30. Further, when performing the circuit breaker interlock test, the connection cable 77 connected to the auxiliary contact 75 of the circuit breaker 70 is connected to the input terminal 76 of the tester 2 to be in the state shown in FIG.

When a test current is supplied from the tester 2 to the test terminal 40 during the test, the protection relay 1 operates in the same manner as in the normal operation described above, and when the current value exceeds the set value, the relay 26 is activated. Then, the output contact 24 is turned on, and the test contact 28 is turned on. Thereby, the trip coil 71 operates and the circuit breaker 70 cuts off the circuit. The output of the test contact 28 is supplied to the test device 2 via the test connector 30 and the contact confirmation cable 64 while being supplied to the test device 2.

FIG. 4 is a flowchart of the operation time measurement by the tester 2. In this embodiment, as described above,
In accordance with the presence or absence of connection of the connection cable 77, the operation time of the protection relay alone or the operation time of the circuit breaker interlock is determined and measured.

First, a test current is supplied to the protection relay 1 to start a test and time measurement is started (step n1), and it is determined whether or not the output contact 42 of the protection relay 1 is operated (step n2). ), When it works,
Judgment as protection relay unit test when inputting only motion signal
When inputting the operation signal and the auxiliary contact output,
It is determined that the test is an interlock test (step n3). Here,
The protection relay unit test is indicated by IN as a test of the internal contact of the protection relay 1, and the circuit breaker interlock test is performed by the circuit breaker 7.
Indicated by AUX as being a test of an auxiliary contact of 0.

If it is determined in step n3 that the test is for the protection relay alone, the process proceeds to step n6.
The time measurement is stopped, and the measured time is displayed as the operation time (IN) of the protection relay alone (step n7).

If it is determined in step n3 that the test is a circuit breaker interlocking test, the time measurement is held and stored as the operating time of the protection relay alone (step n3).
4) Further, it is determined whether or not the auxiliary contact 75 of the circuit breaker 70 has been operated (step n5). When it has been operated, the time measurement is stopped (step n6), and the measured time is measured by the protection relay 1 and the cutoff. Total operating time (T
OTAL), the time stored in step n4 is displayed as the operation time (IN) of the protection relay alone, and the operation time (AUX) of the circuit breaker alone
From the total operation time (TOTAL) including the protection relay 1 and the circuit breaker 70 to the operation time (I
N) is obtained and displayed (step n)
7).

FIG. 5 shows the operation times measured or calculated in the circuit breaker interlocking test as described above. FIG. 5A shows the operation time of the protection relay alone, and FIG. ) Indicates the operation time of the interlock including the protection relay and the circuit breaker, and FIG. 7C indicates the operation time of the single circuit breaker calculated by subtracting the operation time of the single protection relay from the operation time of the interlock.

Conventionally, as in this embodiment, the protection relay 1 has a test circuit section 16 having a test contact 28 linked to the output contact 24 and a contact confirmation cable 6.
4 is not provided, and during the test, the contact confirmation cable 64 is connected to the substation 3
8, the protective relay 1 is opened and its output contact 42
According to the present invention, the test can be performed simply by connecting the contact confirmation cable 64 to the test connector 30 from the front of the protective relay 1 according to the present invention.

In this embodiment, the tester 2 automatically determines whether the test is for the protection relay alone or for the circuit breaker interlocking test. However, as another embodiment of the present invention, the tester 2 However, it is of course possible to set whether the test is a unit test or an interlock test.

[0033]

As described above, according to the present invention, a tester for supplying a test electric quantity to a protection relay includes an output of a test contact corresponding to an output of the protection relay and a breaking operation of the circuit breaker. The output of the auxiliary contact corresponding to the above can be taken in at the same time, so that the operation time of the protection relay alone and the operation time of the circuit breaker interlock can be measured at the same time in one test. The work of disconnecting and connecting the wiring as in the conventional example, in which the circuit breaker interlocking test is performed separately, is not required, and the number of tests only needs to be one, which significantly reduces the time required for the test. In addition, the operating time of the protection relay alone and the operating time of the circuit breaker interlock can be measured under the same condition, and accurate timing measurement can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a partial front view of the protection relay.

FIG. 3 is an explanatory diagram of a state during a test.

FIG. 4 is a flowchart for explaining the operation.

FIG. 5 is a time chart of each operation time.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Protective relay 2 Tester 24 Output contact 28 Test contact 70 Circuit breaker 71 Tripping coil 75 Auxiliary contact

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Toshimori Fujieda 91-1, Nakagami, Minamisayama, Iruma-shi, Saitama Musashi Electric Instrument Works Co., Ltd. (72) Inventor Osamu Fukui, Iruma-shi, Saitama 918-1 Minamisayama Inside Musashi Electric Instrument Works Co., Ltd. (56) References JP-A-4-368418 (JP, A) JP-A-4-185222 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) H02H 3/05

Claims (2)

(57) [Claims] (1) A protection relay, a circuit breaker, and a tester.
Constructed, the protection relay comprises an input to which a test current is supplied;
The output contact connected to the trip coil of the circuit breaker
Internal relays, and test contacts linked to the output contacts
And a test terminal for outputting an operation signal of the test contact
A setting section for setting a set value, and a setting section for setting the set value.
Set value and test supplied from the input terminal
Current, and when the test current exceeds the set value, the
1 CP that drives the internal relay to control the output contact to turn on
U, and the circuit breaker is turned on and off of the output contact of the protection relay.
The trip coil operates by force and turns on accordingly
The tester is connected to an input terminal of the protective relay.
A current generator for generating a current for supplying a current,
1st input of operation signal from test terminal of protective relay
From the breaker via the input terminal and the connection cable
A second input terminal for inputting an auxiliary contact output of
Protection relay when inputting an operation signal only from the input terminal
Calculates the protection relay's single operation time by judging it as a single unit test
And an operation signal and an auxiliary contact output from the two input terminals.
When inputting, it is judged as a circuit breaker interlock test and the circuit breaker interlock
Calculate the operation time and calculate the operation time
Cut off by reducing the operation time of the protection relay alone
And a CPU for calculating the vessel standalone operation time, the connection of the connecting cable between the circuit breaker and the tester
Each operation time is measured simultaneously by one test depending on the presence or absence of
A protective relay / circuit breaker test system , which is enabled . 2. A test current is supplied to an input terminal of a protective relay.
A current generator for generating a current to supply, and the protection
First input for inputting the operation signal from the test terminal of the relay
Terminal and the auxiliary connection from the ACB via the connection cable.
A second input terminal for inputting a point output, and the first input terminal
When inputting the operation signal only from the
Calculate the operating time of the protective relay alone
When the operation signal and auxiliary contact output are input from the input terminal
Is judged to be a circuit breaker interlock test,
And the protection relay from the breaker interlocking operation time.
By subtracting the electric device alone operation time, breaker standalone operation
A CPU that calculates time, and determines whether or not the connection cable is connected to the circuit breaker.
Each operation time can be measured simultaneously by one test.
And has, tester, characterized in that.