JP5082961B2 - Switchboard AC voltage circuit testing apparatus and method - Google Patents

Description

  The present invention relates to a switchboard testing apparatus that is mounted on a test terminal of a switchboard and tests the switchboard operation without applying an actual voltage.

  To test the AC voltage circuit of the switchboard (instrument transformer 13 secondary circuit 132), the main circuit receiving circuit breaker 12 is closed and the actual voltage is directly applied to the primary side 131 of the instrument transformer 13. After the primary test to be confirmed from the power supply side 111 of the test terminal 11 and the test transformer secondary test terminal 11 is opened as shown in FIG. 2, a test power supply (AC110V) 3 different from the actual system is connected. The simulation circuit is assembled so that the auxiliary relay 7 and the like are driven under the condition that the power receiving breaker 12 is turned on, and a voltage is applied to the secondary circuit 112 of the test terminal 11 through the contact point. There is a method of performing the test in a state of being separated from each other.

  The primary test, in which the actual voltage is directly applied to the main circuit and confirmed, is conducted to check the vibration of each instrument during energization in addition to the presence or absence of equipment abnormalities due to actual pressurization. The method to be applied to the secondary circuit 132 is used for a power failure detection detection by the voltage relay 16 with a high voltage switchboard or the like, and for a confirmation test of the automatic opening / closing operation of the distribution line breaker accompanying this. A simulation circuit as shown in FIG. 2 is built in order to prevent an electric shock accident due to application and to simplify the test.

  In FIG. 2, the test is performed with no voltage applied to the main circuit. In this case, the status signal of the power receiving breaker 12 is amplified by the auxiliary relay 7 by the auxiliary contact 121 of the power receiving breaker, and the test power source connected to the test terminal on the secondary side of the instrument transformer is opened and closed by the contact 14. For example, a voltage is applied to the secondary side of the instrument transformer in conjunction with the opening and closing of the power receiving circuit breaker 12, so that a power failure / recovery state can be simulated and connected to the secondary side of the instrument transformer. The operation of the voltmeter and voltage relay can be confirmed.

When the voltage relay 16 detects a power failure state, the power relay display circuit 17 issues a power failure display and alarm by an accompanying sequence circuit and automatically shuts off the distribution line breaker 17. Similarly, when a power recovery state is detected, a power recovery display and an alarm are issued, and the distribution line breaker 17 is automatically turned on.
A series of operation checks can be performed by turning on and off the test power supply connected to the secondary circuit of the instrument transformer, but electrical confirmation between the power receiving point, the power receiving breaker, the instrument transformer, and the test terminal is It is common to check the continuity with a tester or the like, not simultaneously. For this reason, it takes time to check the continuity, which is an inefficient work. In addition, the conduction work was checked individually, and there was a mistake in the connection check.
A method of measuring current voltage while applying an actual voltage to the main circuit to keep the equipment in an operating state is known (see, for example, Patent Document 1). However, the present invention is more complete by separating the switchboard from the line. Therefore, such a technique has not been known in the past.

JP 2005-80320 A

FIG. 2 shows the case where the power is received by one line, but there are also power distribution systems for multiple lines (usually-spare, spot network, etc.) and systems with switching to the generator. For, a simulation circuit must be built according to the equipment configuration.
In the primary test in which the actual voltage is directly applied to the main circuit, the test voltage becomes high in high-voltage switchboards, etc., and the test equipment becomes large, and there is a risk of electric shock.

  According to the present invention, the test apparatus power receiving end 91 connected to the power source side 111 of the test terminal on the secondary side 132 of the instrument transformer, the load resistor 5 receiving the test current from the power receiving end 91, and the current flowing through the load resistance A current detection sensor 6 for detecting the voltage, a low voltage application terminal 8 for directly applying a test low voltage to the main circuit during an AC voltage circuit test of the switchboard, a test power supply 4 for supplying a test current thereto, and an instrument transformer based on the test current A current detection sensor 6 for detecting a current flowing through the load resistor 5 by a voltage generated on the secondary side 132, and an auxiliary relay for outputting a control signal for supplying a test power to the secondary side of the instrument transformer by its output signal 7, a contact 14 for controlling the current of the test power supply by a control signal of the auxiliary relay, and a current of the test power supply controlled by the contact 14 is connected to the secondary side of the test terminal. The test voltage output terminal 9 provides a test device in which the same voltage as that when the actual voltage is applied to the main circuit is applied to the voltage relay or instrument connected to the secondary side of the instrument transformer. .

In order to apply the test voltage directly to the main circuit of the switchboard, when performing a power recovery detection by the voltage relay 16 or an automatic open / close operation test of the distribution line circuit breaker 17, a simulated circuit incorporating the state signal of the circuit breaker 12 is used. Since they do not have to be assembled, a uniform test circuit can be obtained, and the efficiency of the test can be improved.
Even for high-voltage switchboards, the low voltage (AC110V) is applied to the main circuit, the test equipment is light, and safety is high. Relay operation tests and instrument runout under the same conditions as actual operation Can be confirmed.

  The present invention focuses on the fact that even if a low voltage (AC 110 V) is applied to the power receiving point 10, a test equivalent to the actual voltage application test can be performed, and a high voltage (here, 6600 V) is explained by applying the low voltage (AC 110 V). ) The test method is the same as the application test.

  When the power receiving breaker 12 is turned on with a low voltage (110 V) applied to the power receiving point 10, a low voltage (110 V) is applied to the primary side 131 of the instrument transformer 13, and a voltage corresponding to the transformation ratio is applied to the secondary side 132. (1.83 V) is generated. This voltage is similarly applied to the primary side 111 of the test terminal 11. When the voltage output 8 of the test apparatus 1 is connected to the main circuit inside the switchboard of the switchboard 2 and the power supply side 111 load side 112 of the test terminal 11 is connected to the test apparatus 1, the power supply side 111 has a load resistor 5 for each phase and The current sensor 6 connected in series is connected, and a low voltage (110 V) is connected to the load side 112 via the operation contact 14 of the current detection sensor 6. When a voltage is applied to the instrument transformer 13 in this state, a current flows to the current detection sensor 6 through the load resistor 5 on the instrument transformer secondary side 112, the sensor 6 operates, and a low voltage (110V) is generated. Applied to the test terminal load side 112. If this test apparatus 1 is used, the electrical confirmation between the receiving point 10 to the receiving circuit breaker 12 to the measuring transformer 13 to the test terminal 11 is ensured without applying an actual voltage (6600 V) to the main circuit. I can do it. Further, the test terminal 11 is opened at the time of the test, and the power supply side 111 and the load side 112 are not connected, and there is no contact when the power receiving breaker 12 is turned on and off. The right circuit is opened and closed as it is based on the information on the left side of the auxiliary relay 7, and the test under the same conditions is possible without applying the actual voltage to the main circuit.

  The present invention is applicable to a switchboard testing apparatus and test method that can test all of the power receiving circuit breaker, instrument transformer, and switchboard control means from the power receiving end without applying an actual voltage to the power receiving end of the switchboard.

It is a figure which shows the alternating voltage circuit (instrument transformer secondary circuit) test circuit of the switchboard which concerns on embodiment of this invention. It is a figure which shows the alternating voltage circuit (instrument transformer secondary circuit) test circuit of the conventional switchboard.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Test apparatus 2 ... Distribution board 3 ... Test power supply 4 ... Switch 5 ... Load resistance 6 ... Current detection sensor 7 ... Auxiliary relay 8 ... Test apparatus 1 Test power supply voltage output terminal 9... Test power supply voltage output terminal 91 drawn through the auxiliary relay contact... Test device power receiving terminal 10... Power receiving point 11. Power source side 112 ... Test terminal load side 12 ... Receiving circuit breaker 13 ... Instrument transformer (VT)
131 VT primary side 132 VT secondary side 14 auxiliary relay contact 15 switchboard control means 16 voltage relay 17 distribution line breaker

Claims (3)

In a test device that tests the function of the switchboard that is connected to the switchboard and controls power failure and recovery, supply the test voltage to the incoming circuit breaker of the main circuit and apply it to the load side of the test terminal during normal operation. A test power supply that supplies the same voltage as the wax, a test power receiving terminal that takes in a test voltage supplied from the test power supply through the power receiving breaker and transformed by the instrument transformer, and outputs a test voltage from the test power supply The power receiving end that receives the test current transformed by the instrument transformer from the power supply side of the output terminal and the test terminal of the switchboard, and the instrument transformer of the switchboard according to the amount of current flowing through the power receiver end. A test apparatus comprising switching means for directly supplying the voltage of the test power supply to the load side of the test terminal without using it.   A load resistance and a current detection sensor are attached to each phase of the test voltage output from the power supply side of the test terminal, and the voltage from the test power supply is passed through the instrument transformer by the contact driven by the current sensor. 2. The test apparatus according to claim 1, wherein the test apparatus is supplied to a load side of the test terminal.   A low-voltage test voltage that is not the actual voltage is supplied from the receiving end of the switchboard, the test current is taken out from the power supply side of the test terminal, and it will come out when the actual power is received by the auxiliary relay according to the test current A distribution board test method in which the secondary voltage of an instrument transformer is supplied directly from the test power supply to the load side of the test terminal, and the distribution panel functions according to the test voltage are checked for abnormalities.

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