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protective relay

A relay device and voltage technology, applied in emergency protection circuit devices, emergency protection devices, circuit devices, etc., can solve problems such as system equipment damage, influence of power system stability, failure, etc.

Inactive Publication Date: 2015-08-19
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the event of a permanent failure such as contact with a tree or disconnection, the failure will reoccur even if the CB is turned on again after the set reconnection no-voltage time elapses.
Reconnecting the CB while the fault continues like this will cause damage to the system equipment (CB, transformer, or transmission line, etc.), which in turn will affect the stability of the power system

Method used

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no. 1 approach ）

[0031] figure 1 It is a block diagram of the electric power system 20 provided with the protective relay device 1 which concerns on 1st Embodiment of this invention. In addition, the same part is attached|subjected to the same code|symbol in each figure, and the detailed description is abbreviate|omitted, and a different part is mainly described. Repeated descriptions are similarly omitted for the following embodiments.

[0032] The power system 20 is a three-phase AC two-terminal power system. In the power system 20 , a CT 2 and a VT (Voltage Transformer: Voltage Transformer) (transformer for measuring instruments) 3 are provided for each phase. On the self-end side of the power system 20, a CB 4a is provided for each phase. On the opposite end side of the power system 20, a CB 4b is provided for each phase.

[0033] The current detected by the CT 2 of each phase and the voltage VL detected by the VT 3 of each phase are input to the protective relay device 1 . The prote...

no. 2 approach ）

[0088] Figure 7 It is a circuit diagram showing the sequence of the protective operation of the protective relay device 1A according to the second embodiment of the present invention.

[0089] The protective relay device 1A is used in figure 2 The protection relay device 1 according to the first embodiment shown has a configuration in which a phase difference determination unit 111 is added and a reconnection circuit 100A is used instead of the reconnection circuit 100 . The reconnection circuit 100A has a configuration obtained by replacing the AND gate 105 with an AND gate 105A in the reconnection circuit 100 of the first embodiment, and adding an AND gate 112 . Others are the same as those of the protective relay device 1 of the first embodiment.

[0090] The phase difference determination unit 111 determines whether or not the phase difference between the voltage measurement value VL measured by the VT 3 and the reference voltage value Vk at the time of non-fault when ...

no. 3 approach ）

[0108] Figure 10 It is a configuration diagram of a power system 20B provided with a protective relay device 1B according to a third embodiment of the present invention.

[0109] In the power system 20B, the protective relay device 1B is used instead figure 1 The protection relay device 1 in the electric power system 20 of the first embodiment shown is provided with a protection relay device 1Bb on the opposite end side, and a VT 3b is provided in each phase on the opposite end side. Others are the same as those of the power system 20 of the first embodiment.

[0110] The VT 3b is equivalent to the VT 3 installed on the own end side. The VT 3b detects the voltage of each phase of the power transmission line on the opposite end side of the power system 20 .

[0111] The protective relay device 1Bb is equivalent to the protective relay device 1B provided on the own end side. The protective relay device 1Bb measures the voltage of each phase of the transmission line of the ...

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Abstract

This invention provides a protection relay (1) that protects the power transmission lines of a three-phase AC power system (20). In response to detection of a fault, the protection relay (1) opens a CB (4a) of the fault phase for which the fault has occurred. After opening the CB (4a), the protection relay (1) determines, on the basis of a voltage measurement value (VL) of the fault phase detected by a VT (3), whether the fault has been eliminated. If having determined that the fault has been eliminated, the protection relay (1) closes the CB (4a) again.

Description

technical field [0001] The invention relates to a protective relay device with reconnection function. Background technique [0002] In the past, known applications such as Figure 15 The 2-terminal power system of the protective relay device 10 is shown. The current detected by CT (current transformer: current transformer) (current transformer for measuring instruments) 2 and the opening and closing of electrodes indicating CB (circuit breaker: circuit breaker) (circuit breaker) 4 are input to protective relay device 10 status signal. The protective relay device 10 detects a fault based on the current detected by the CT. When the protective relay device 10 detects a failure, it outputs a cutoff signal to the CB 4 to make the electrodes of the CB 4 open (open). Cut off the fault current by opening CB 4. Turning on (ie closing) the CB 4 again after opening the CB 4 is referred to as reclosing or reconnecting. After the CB 4 is disconnected, the power failure time can be s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/06
CPCH02H3/066H01H83/00H02H7/22
Inventor 大友优大野博文
Owner KK TOSHIBA