Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
  • H02H1/00—Details of emergency protective circuit arrangements
  • H02H1/0038—Details of emergency protective circuit arrangements concerning the connection of the detecting means, e.g. for reducing their number
  • H02H1/0046—Commutating the detecting means in dependance of the fault, e.g. for reducing their number
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
  • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
  • H02H3/40—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to ratio of voltage and current

Definitions

• This invention relates to a distance relay installed in an electric power system.o
• Fig. 1 shows a conventional device of this type.
• A, B, and C phase failure detection elements that detect the failure of the phase in charge.
• (3) Zero-phase failure that receives the output of the input transformer ⁇ and detects a ground fault.
• the detection element ( 4 ) receives the outputs A, B, C, and N of the A, ⁇ , and C phase failure detection elements (2) and the zero-phase failure detection element (3) directly.
• Output of input transformer (1) VIA, VIB,
• VIC, VIN, EA;, EB , EC, -E-3 ⁇ 4- switches the three sets of signals SI o, S EO, switching circuit which outputs a S EP, (5) the above S as a calculation input io, SEO, and reference It is a measuring element that receives the above-mentioned EP as an input, measures the distance to the fault point based on these, responds to a fault within the set range, and outputs a signal.
• FIG. 2 specifically shows the switching circuit ( 4 ) in FIG.
• VIA, VIB, VIC, VIN, EA, EB, EC, and EN are signals from the input transformer (l)
• A, B, C, and N are failure detection elements ( 2 ) and And (S) force signals, RYA, RYB, RYC, and YN, respectively, receive the above A, B, C, and N to perform switching, switching relay, SIO, SEO, SEP.
• the output from the CT and PT powers is supplied to the relay via the input transformer (1).
• A, B, C The failure detection element of each phase receives the output of the above-mentioned input transformer, and detects the failure of the phase in charge.
• the zero-phase fault detecting element (3) receives the output of the above-mentioned input transformer (3) and detects a ground fault.
• These fault detection elements ( 2 ) and (3) output signals A, B, C, and N for driving the switching contacts in the switching circuit.
• the switching circuit ( 4 ) outputs the output signal from the input transformer (1). It has contacts for switching VIA, VIB, VIC, ViN, EA, EB, EC, and EN according to the type of failure.
• the switching circuit (4) includes switching relays RY A, RYB, RYC,
• the output from the switching circuit ( 4 ) is supplied to the measuring element ( 5 ).
• the measurement element ( 5 ) is the three sets of input signals from ( 4 )
• the conventional device has the failure detection elements (,, and).
• the output signal of the transformer (1) was transmitted to the distance measuring element ( 5 ) via a plurality of switching contacts. In this way, many contacts
• the present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional one, and does not directly drive the switching contact with the output of the failure detection element, but instead uses the switching logic.
• Driving the switching circuit through a switching circuit simplifies the switching circuit, thereby achieving high reliability, low cost, and the effect of the contact resistance of the switching contact. It provides a switchable distance relay that is difficult to receive.
• FIG. 1 is a block diagram of the conventional switching distance converter
• Fig. 2 is a diagram showing the specific circuit of the switching circuit in Fig. 1
• Fig. 3 is the type of fault and each input.
• FIG. 4 is an explanatory diagram showing the relationship between the output of the relay and the output of the switching circuit
• FIG. 4 is a diagram showing a switching type distance relay according to an embodiment of the present invention
• FIG. 3 is a diagram showing a specific example of a switching circuit. Best mode for carrying out the invention
• FIG. 4 is a circuit diagram of one embodiment of the distance relay device according to the present invention.
• (1) is the input trans- lator that receives the output of the power system CT and PT and outputs a signal corresponding to the input.
• A, B, and C phases that detect the failure of the phase in charge by receiving the output of (1), the failure detection element of each phase, and ( 3 ) receive the output of the input transformer (1).
• the zero-phase fault detection elements that detect ground faults are the A, B, C, and N outputs of the A, B, and C phase fault detection elements ( 2 ), and the zero-phase fault detection elements ( 3 ).
• the switching logic circuit that synthesizes and outputs the ON-OFF command signal of each switching contact of the switching circuit of () as a result of the logical operation, and outputs the switching logic circuit.
• Switching circuit, (5) is arithmetic
• FIG. 5 shows a specific example of the switching circuit ( 4 ) shown in FIG. In Fig. 5, VIA, VIB,
• VI C, V IN, EA, EB, EC, and EN are the signals from the input transformer (1), S 11 to Si 4, S 21 to S 23, S 31 to S 34, S 1
• SS43, S51 ⁇ S53, S61 1S63 are the output signals of the switching logic circuit ⁇ , RY1 1 ⁇ RY14, RY21—RY23; RY31
• ⁇ RY34, RY41 ⁇ RY43, RY51 ⁇ RY53, Y61 ⁇ RY63 each receive the output signal of the switching logic circuit ⁇ and perform switching.
• the fault detection elements (A, B, and C) detect the fault of the phase in charge by receiving the output of the input transformer (1). Also, the zero-phase fault detection elements (3 ) Receives the output of the input transformer (1) and detects a ground fault, and these fault detection elements ( 2 ) and (
• the switching logic circuit ⁇ receives the signals A, B, C, N
• ⁇ is ANI ⁇ V and ⁇ ⁇ is the negation of ⁇ .
• S 1 1 ( ⁇ ⁇ V ( ⁇ AC ⁇ :)... (1)
• S 12 (B AC ⁇ ) V (B AC ⁇ : :)... (2)
• S 13 (C ⁇ ⁇ V (C ⁇ • V (AABAC V (AABACAN)... (3)
• sl 4 (AABAN V (BAAAN) VCC ABAN
• S 31 (AABACAN) V (AABACAN:)... (8)
• S 32 (BACAAAN V (BAC ⁇ )... (9)
• S 33 ( ⁇ ⁇ ( ⁇ )
• V (AABAC) V ( ⁇ ?? WS 34 ( ⁇ ⁇ ⁇ ) V ( ⁇ ⁇ ; V (C ABAN) V (AABACAN-3 ⁇ 4
• the switching circuit output signals S io, SEO, and SEP that are output as a result of driving RY63 are the same as those of the conventional switching circuit outputs SIO, SEO, and SEP in FIG. In this case, the above logical formula is made to be equivalent.
• the logic in the logic circuit ( ⁇ ) is used.
• the arithmetic expression is configured to obtain the same output as the conventional device, but by changing the logical expression as appropriate, it is possible to freely switch output for all types of failures
• the force S can be obtained.
• the switching circuit is driven via the switching logic circuit without directly driving the switching contact by the output of the failure detection element. Therefore, the switching circuit is simplified, high reliability, low cost, and insensitive to the contact resistance of the switching contacts.

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• Emergency Protection Circuit Devices (AREA)
• Keying Circuit Devices (AREA)

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Publications (1)

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ID=15628932

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Citations (2)

• 1979
  • 1979-11-30 JP JP15649279A patent/JPS5681032A/ja active Granted
• 1980
  • 1980-11-28 WO PCT/JP1980/000290 patent/WO1981001632A1/ja not_active Ceased
• 1981
  • 1981-04-04 IN IN373/CAL/81A patent/IN154206B/en unknown

Patent Citations (2)

Non-Patent Citations (2)

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