CN103018702A - Fast checking method of high-voltage cabinet current transformer secondary loop line - Google Patents

Abstract

The invention provides a fast checking method of a high-voltage cabinet current transformer secondary loop line. The method comprises the following steps: using a line checker composed of a battery pack, a small bulb and a probe in series connection to check, removing connecting lines of two grounding terminals at the secondary current side, a current relay and an ampere meter; firstly self-checking the line checker, then connecting one end of the line checker with a first terminal at a terminal strip before the cabinet, using the probe of the line checker to respectively click a second terminal, a third terminal and a fourth terminal of the terminal strip, wherein the terminal in sparking belongs to the same loop of the first terminal; and using a volt-ampere characteristic tester to respectively judge and determine a protection loop and a measurement loop at the secondary side of the transformer. Since the sparking can be produced when the circuit is opened, the fast checking method provided by the invention can fast and correctly judge whether the connection of two groups of secondary loop is correct; the tedious work of detaching and connecting the secondary line of the current transformer is avoided, and the efficient and correct effect is achieved when debugging the high-voltage cabinet.

Description

The quick proofreading method of a kind of high-voltage cabinet current transformer secondary loop wire

Technical field

The invention belongs to high-voltage electrical apparatus debugging field, relate to a kind of method that wiring is proofreaded to secondary loop of mutual inductor.

Background technology

At present, the interior space of its cabinet of widely used high-voltage board is very narrow and small on the market, its current transformer is installed very compactly, for the high-voltage board that has installed, whether the commissioning staff is correct such as the secondary electric streamline that will detect current transformer in the high-voltage board, need to remove wiring, need again reconnection after check and correction is good, in small space, carry out aforesaid operations very difficult, and after detecting end, the Current Transformer Secondary line need to reconnect not only difficulty and might cause the new problem such as mistake line, affects the safe operation of high-voltage board and relevant device.

Summary of the invention

Purpose of the present invention will overcome the above problems exactly, provide a kind of high-voltage cabinet current transformer secondary loop wire quick proofreading method, utilize the energy-storage function of inductance element, the moment that disconnects at circuit can produce pyrophoric behavio(u)r, judge quick and precisely whether two groups of secondary circuit wiring of current transformer are correct, need to tear, connect the loaded down with trivial details work of Current Transformer Secondary line when having exempted debugging open, when high-voltage board is debugged, reach efficiently, effect accurately.

Technical scheme of the present invention is achieved like this: the quick proofreading method of a kind of high-voltage cabinet current transformer secondary loop wire, be characterized in: adopt the correcting line machine 10 that is composed in series by 3v electric battery E, 2.5V miniature bulb W and probe T to carry out proofreading before the cabinet, its step is as follows:

1) opening high pressure cabinet bonnet removes the first ground terminal 4 and second ground terminal 7 of mutual inductor secondary current side, and separates at current transformer installation site side;

2) connecting line at dismounting current relay 3 and reometer 6 two ends is all thrown off measuring circuit and the protection loop of Current Transformer Secondary side;

3) first correcting line machine 10 is carried out self check, one of correcting line machine 10 is terminated on the first connection terminal XT-1 of terminal row 2, then the probe T with correcting line machine contacts correcting line machine bulb Chang Liang with the first connection terminal XT-1 of terminal row 2, and brightness is normal, shows that this correcting line machine is good for use;

4) correcting line machine 10 1 is terminated on the first connection terminal XT-1 of terminal row 2, the probe T of correcting line machine is clicked respectively the second connection terminal XT-2, the 3rd connection terminal XT-3, the 4th connection terminal XT-4 of terminal row 2, producing pyrophoric that connection terminal namely is to belong to same loop with the first connection terminal XT-1;

5) use with the same method of step 4) and can determine other electric current secondary loops, the wiring correctness in this loop has also obtained checking when determining electric current secondary loop;

6) utilize Testing Instrument for Volt-ampere Characteristic on the high-voltage board terminal row, to judge respectively protection loop and the measuring circuit of confirming the mutual inductor secondary side;

7) detect complete after, first restoring current mutual inductor installation site side the first ground terminal 4 and the second ground terminal 7, the again connecting line at restoring current relay 3 and reometer 6 two ends.

The present invention utilizes the energy-storage function of inductance element, produce pyrophoric behavio(u)r in the moment that circuit disconnects, judge quick and precisely whether two groups of secondary circuit wiring of current transformer are correct, need to tear, connect the loaded down with trivial details work of Current Transformer Secondary line when having exempted debugging open, when high-voltage board is debugged, reach efficiently, effect accurately.

Description of drawings

Fig. 1 is Current Transformer Secondary current return principle schematic.

Fig. 2 is that inductor loop of the present invention is confirmed the proofreading method schematic diagram.

Among the figure: 1---current transformer protection coil; 2---terminal row; 3---current relay; 4---protection loop ground terminal; 5---the current transformer measuring coil; 6---reometer; 7---the measuring circuit ground terminal; 8---terminal row; 9---telefault; 10---correcting line machine; E---3V electric battery; W---2.5V miniature bulb; T---probe.

Embodiment

Inductance is a kind of energy-storage travelling wave tube, and its voltage equation is: UL=L*(di/dt)

L is the inductance value of inductance element in the formula, and i is the electric current of inductor loop.

By following formula as can be known, when the electric current of the inductance element of flowing through was undergone mutation, the inductance two ends can produce certain voltage, and under normal conditions, the analog loopback open-circuit condition can produce Spark Discharges, and whether can judge thus has inductance to exist in this loop.

From Fig. 1, Fig. 2 as seen, correcting line machine 10 is composed in series by 3v electric battery E, 2.5V miniature bulb W and probe T in the empty frame.Bulb Chang Liang when connecting in the loop, in the moment that the terminal XT-2 of probe T and terminal row 8 disconnects, terminal XT-2 produces spark to probe T discharge, shows that this loop has inductance to exist; Occur then in the loop judging a complete inductor loop without inductance with this in the moment no-spark that probe disconnects.Simultaneously, cooperate the volt-ampere characteristic of each self-loop, can judge that this loop is measuring circuit or protection loop.Utilize the method can judge rapidly and accurately electric current secondary line from the mutual inductor different circuit, so just the secondary electric streamline of mutual inductor need not be removed the accuracy that just can guarantee this current circuit connections.Quick proofreading method step of the present invention is as follows;

1) opening high pressure cabinet bonnet removes ground terminal 4 and the ground terminal 7 of mutual inductor secondary current side, and separately, avoids mutually touching the correctness that affects the inspection of line because of ground terminal at current transformer installation site side;

2) connecting line at dismounting current relay 3 and reometer 6 two ends is all opened a way measuring circuit and the protection loop of Current Transformer Secondary side;

3) first correcting line machine is carried out self check, correcting line machine one is terminated at the XT-1 terminal of Fig. 1 terminal row 2, then the probe with correcting line machine contacts with the XT-1 terminal of terminal row 2, correcting line machine bulb Chang Liang, and brightness is normal, shows that this correcting line machine is good for use;

4) correcting line machine one is terminated at the first connection terminal XT-1 of terminal row 2, the probe of correcting line machine is clicked respectively the second connection terminal XT-2, the 3rd connection terminal XT-3, the 4th connection terminal XT-4 of terminal row 2, producing pyrophoric that connection terminal namely is to belong to same loop with the first connection terminal XT-1;

5) use and 4) similarly method can determine other electric current secondary loops, the wiring correctness in this loop has also obtained checking when determining electric current secondary loop;

6) utilize Testing Instrument for Volt-ampere Characteristic on the high-voltage board terminal row, to judge respectively protection loop and the measuring circuit of confirming the mutual inductor secondary side;

7) detect complete after, first restoring current mutual inductor ground terminal 4 and ground terminal 7, the connecting line at restoring current relay 3 and reometer 6 two ends again, and guarantee that secondary loop of mutual inductor can open running.

In Fig. 2, in the connection terminal XT-1 of probe stationary contact terminal 8 process, require the loop steady-state current to be not more than 100mA, Keep Clear-High Voltage otherwise might produce.

Claims (1)

1. quick proofreading method of high-voltage cabinet current transformer secondary loop wire is characterized in that: adopt the correcting line machine 10 that is composed in series by 3v electric battery E, 2.5V miniature bulb W and probe T to carry out proofreading before the cabinet, its step is as follows:

1) opening high pressure cabinet bonnet removes the first ground terminal 4 and second ground terminal 7 of mutual inductor secondary current side, and separates at current transformer installation site side;

2) connecting line at dismounting current relay 3 and reometer 6 two ends is all thrown off measuring circuit and the protection loop of Current Transformer Secondary side;

3) first correcting line machine 10 is carried out self check, one of correcting line machine 10 is terminated on the first connection terminal XT-1 of terminal row 2, then the probe T with correcting line machine contacts correcting line machine bulb Chang Liang with the first connection terminal XT-1 of terminal row 2, and brightness is normal, shows that this correcting line machine is good for use;

4) correcting line machine 10 1 is terminated on the first connection terminal XT-1 of terminal row 2, the probe T of correcting line machine is clicked respectively the second connection terminal XT-2, the 3rd connection terminal XT-3, the 4th connection terminal XT-4 of terminal row 2, producing pyrophoric that connection terminal namely is to belong to same loop with the first connection terminal XT-1;

5) use with the same method of step 4) and can determine other electric current secondary loops, the wiring correctness in this loop has also obtained checking when determining electric current secondary loop;

6) utilize Testing Instrument for Volt-ampere Characteristic on the high-voltage board terminal row, to judge respectively protection loop and the measuring circuit of confirming the mutual inductor secondary side;

7) detect complete after, first restoring current mutual inductor installation site side the first ground terminal 4 and the second ground terminal 7, the again connecting line at restoring current relay 3 and reometer 6 two ends.

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