CN101071151A - Amplitude-comparison zero sequence direction relay reactor inter-turn fault measuring method - Google Patents

Abstract

This invention involves a ratio of the rate of zero-sequence direction relay measurement reactor inter-turn fault method, including the following steps: a. movement of tectonic relay function F1 constructed relay system Momentum function F2 ; b. Order F3 = F1 - F2; c. Measurement Reactor zero-sequence current I0 and into the function F; d.; judgment whether F3 >= 0 E. When F3> 0:00, concluded that inter-turn reactor fault relay action. By analyzing the invention reactor malfunctions zero sequence voltage and zero-sequence current phase, the rate of tectonic than zero sequence direction of Relay equation and tectonic movements than fixed-rate zero-sequence direction relay braking capacity equation, the method can Relay in a reactor internal inter-turn brake failure zero, movement of large external reactor in single-phase ground fault occurred when braking tremendous volume of movements of zero, so as to solve the reactor failure in the inter-turn the sensitivity and reliability problems.

Description

Measure the method for inductor turn-to-turn fault than width of cloth formula zero sequence direction relay

Technical field

The present invention relates to electricity field, relate in particular to a kind of method of measuring inductor turn-to-turn fault than width of cloth formula zero sequence direction relay.

Background technology

Along with the electric pressure of transmission line of electricity is more and more higher; electric system is had higher requirement to the shunt reactor turn-to-turn fault protection of high pressure, extra high voltage network, and the zero sequence power direction of reactor protection at present can not satisfied the requirement of system to the inductor turn-to-turn fault protection aspect sensitivity and the reliability.

Summary of the invention

Task of the present invention is to propose a kind of method of measuring inductor turn-to-turn fault than width of cloth formula zero sequence direction relay, it is zero that this method can make relay braking amount when the inner generation of reactor turn-to-turn fault, actuating quantity is very big, the braking amount is very big when the outside generation of reactor singlephase earth fault, actuating quantity is zero, thus sensitivity and integrity problem when solving reactor generation turn-to-turn fault.

Operation equation of phase relation structure of residual voltage and zero-sequence current when to achieve the above object of the invention, the present invention utilizes inner turn-to-turn fault of reactor and outside singlephase earth fault than width of cloth formula zero sequence direction relay.Technical scheme of the present invention is: a kind of method than width of cloth formula zero sequence direction relay measurement inductor turn-to-turn fault, this method comprises the steps:

A. construct the actuating quantity function of relay $F_1=|3{\stackrel{\&CenterDot;}{U}}_0-3{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; L"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_L|,$ The braking flow function of structure relay $F_2=|3{\stackrel{\&CenterDot;}{U}}_0+3{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; S"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S|;$

B. make F ₃=F ₁-F ₂

C. measure the zero-sequence current of reactor , and bring function F into

D. judge F ₃〉=0?

E. work as F ₃, conclude inductor turn-to-turn fault, the actuating of relay at＞0 o'clock.

Than the operation equation of the width of cloth formula zero sequence direction relay Z that need adjust _L0, Z _S0, Z wherein _L0Be the nameplate parameter of reactor, Z _S0Be the zero-sequence reactance of system, generally adjusting is Z _S0=(0-1.0) Z _L0

The phase relation of residual voltage and zero-sequence current when the present invention passes through to analyze the reactor fault, structure moves zero sequence direction relay braking amount equation than width of cloth formula zero sequence direction relay actuating quantity equation and structure than width of cloth formula, it is zero that this method can make relay braking amount when the inner generation of reactor turn-to-turn fault, actuating quantity is very big, the braking amount is very big when the outside generation of reactor singlephase earth fault, actuating quantity is zero, thus sensitivity and integrity problem when having solved reactor generation turn-to-turn fault.

Description of drawings

Schematic diagram when Fig. 1 is inductor turn-to-turn fault;

Schematic diagram when Fig. 2 is reactor outside singlephase earth fault;

Fig. 3 is a process flow diagram of the present invention.

Embodiment

Method than width of cloth formula zero sequence direction relay measurement inductor turn-to-turn fault of the present invention, this method comprises the steps:

A. construct the actuating quantity function of relay $F_1=|3{\stackrel{\&CenterDot;}{U}}_0-3{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; L"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_L|,$ The braking flow function of structure relay $F_2=|3{\stackrel{\&CenterDot;}{U}}_0+3{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; S"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S|;$

B. make F ₃=F ₁-F ₂

C. measure the zero-sequence current of reactor

, and bring function F into

D. judge F ₃〉=0?

E. work as F ₃, conclude inductor turn-to-turn fault, the actuating of relay at＞0 o'clock.

As seen, as follows than the operation equation of width of cloth formula zero sequence direction relay:

$|3{\stackrel{\&CenterDot;}{U}}_0-3{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; L"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_L|\&GreaterEqual;|3{\stackrel{\&CenterDot;}{U}}_0+3{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; S"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S|$

$|{\stackrel{\&CenterDot;}{U}}_0-{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; L"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_L|\&GreaterEqual;|{\stackrel{\&CenterDot;}{U}}_0+{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; S"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S|$

Following formula: left end is an actuating quantity, and right-hand member is the braking amount.

3  ₀: be added on three times of residual voltages of relay terminal, 3  ₀= _A+  _B+  _C

: be added on three times of zero-sequence currents of relay terminal, $3{\stackrel{\&CenterDot;}{I}}_0={\stackrel{\&CenterDot;}{I}}_A+{\stackrel{\&CenterDot;}{I}}_B+{\stackrel{\&CenterDot;}{I}}_C.$

Z _L0: the every phase zero-sequence reactance of reactor, Z _L0=Z _L0'+Z _L0";

Z _S0: the every phase zero-sequence reactance of system.

Relay characteristic is analyzed:

A), the characteristic of relay during inner turn-to-turn fault

As shown in Figure 1

The direction of arrow is

Positive dirction, this moment primary side

Positive ends by TA flows into.

The following formula substitution is got than width of cloth formula action operation equation:

$|-{\stackrel{\&CenterDot;}{I}}_0{Z}_{S0}-{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; L"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_L|>|-{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; S"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S+{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; S"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S|$

$|-{\stackrel{\&CenterDot;}{I}}_0({\mathrm{<figure-callout\; id="0"\; label="Z\; S"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S+Z_{L0})|>0$

Actuating quantity is very big, and the braking amount is zero, and the directional relay action is the sensitiveest.

B), relay characteristic during outside singlephase earth fault, as shown in Figure 2:

 ₀Leading in

90 °.

The substitution operation equation gets: $|{\stackrel{\&CenterDot;}{I}}_0{Z}_{L0}-{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; L"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_L|<|{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; L"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_L+{\stackrel{\&CenterDot;}{I}}_0{\mathrm{<figure-callout\; id="0"\; label="Z\; S"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_S|$

$0<\left|{\stackrel{\&CenterDot;}{I}}_0({\mathrm{<figure-callout\; id="0"\; label="Z\; L"\; filenames="A20061001775300081.png"\; state="\{\{state\}\}">Z</figure-callout>}}_L+Z_{S0})\right|$

Actuating quantity is zero, and the braking amount is very big, and directional relay is failure to actuate the most reliably.

Fixed value adjusting:

Than the operation equation of the width of cloth formula zero sequence direction relay Z that need adjust _L0, Z _S0, Z wherein _L0Be the nameplate parameter of reactor, Z _S0Be the zero-sequence reactance of system, generally adjusting is Z _S0=(0-1.0) Z _L0

Claims (2)

1, a kind of method than width of cloth formula zero sequence direction relay measurement inductor turn-to-turn fault is characterized in that this method comprises the steps:

A. construct the actuating quantity function of relay $F_1=|3{\stackrel{.}{U}}_0-3{\stackrel{.}{I}}_0{Z}_{L0}|,$ The braking flow function of structure relay $F_2=|3{\stackrel{.}{U}}_0+3{\stackrel{.}{I}}_0{Z}_{S0}|;$

B. make F ₃=F ₁-F ₂

C. measure the zero-sequence current of reactor

, and bring function F into

D. judge F ₃〉=0?

E. work as F ₃, conclude inductor turn-to-turn fault, the actuating of relay at＞0 o'clock.

2. according to claim 1ly measure the method for inductor turn-to-turn fault, it is characterized in that, than the operation equation of the width of cloth formula zero sequence direction relay Z that need adjust than width of cloth formula zero sequence direction relay _L0, Z _S0, Z wherein _L0Be the nameplate parameter of reactor, Z _S0Be the zero-sequence reactance of system, generally adjusting is Z _S0=(0-1.0) Z _L0

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