JP3009595B2 - Ground fault relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground fault relay for detecting a ground fault occurring in a distribution line and automatically opening a high-voltage load switch.

[0002]

2. Description of the Related Art Conventionally, a ground fault relay of this type detects a zero-phase current via a zero-phase current transformer provided on a distribution line when a ground fault occurs in a distribution line. I have. Based on this detection signal, the ground fault relay operates a trip coil provided in the high-voltage load switch, and automatically opens the switch to disconnect the ground fault accident section from the sound line promptly.

[0003] In such a ground fault relay, a ground fault characteristic tester prepared separately for monthly inspection and annual inspection is used to determine whether or not the switch can be opened within a predetermined time in the event of a ground fault. It is obligatory to conduct characteristic tests such as

[0004]

However, in a conventional operation test of a ground fault relay, a terminal provided on a ground fault relay and a terminal provided on a connected body such as a ground fault characteristic tester are used by an operator. Gawazawaza must be connected to terminals provided on one not a one earth絡継collector. For this reason, there has been a problem that the connection work as described above is troublesome for an operator. In addition, there is a problem that the connection work as described above requires skill of an operator to prevent a connection error. In addition, due to the spread of OA systems in recent years, uninterruptible work at the time of this inspection is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems existing in the prior art described above, and has as its object to perform a task of connecting an object to be connected to a connector of a ground fault relay. It is an object of the present invention to provide a ground fault relay which can be easily performed regardless of the degree and in which a power failure accompanying a test is avoided.

[0006]

In order to solve the above-mentioned problems , the invention of claim 1 of the present application is to input a detection signal from a zero-phase current transformer provided on a distribution line via a control line.
A, a trip signal is output via the control line against the trip means provided in the switch based on the detection result of the signal, land絡継Appliances having a control circuit for tripping control trip means of the switch In the middle of the control circuit, a plurality of pairs of input terminals and output terminals
A connection connector having a terminal group is provided, and a trip circuit of the terminals is connected to the connection connector at the time of connection.
A first control connector for short-circuiting an open section between the constituent terminals, and the other end for opening the open section at the time of connection;
To the test line passing through the zero-phase current transformer
The gist is that the connection can be made by appropriately replacing the second control connector for connecting the test circuit of the characteristic tester . The invention of claim 2 of the present application is the invention of claim 1
In the above, the power connector of the ground fault characteristic tester is
It has a power connector that can hold the connection.
At the time of connection, power is supplied from the ground fault relay side to the ground fault characteristic tester side.
The gist is that it is configured to be supplied.
You.

[0007]

According to the present invention thus constructed, the first control connector is connected to the connection connector, the output terminal and the input terminal of the connection connector are short-circuited, and the ground fault relay and the switching means are tripped. It can be set to a normal state in which the control circuit is connected to monitor the ground fault on the distribution line. Also, by replacing the second control connector with the connection connector, a characteristic test circuit using the ground fault characteristic tester is configured, and the trip signal circuit is opened. Therefore,
Only the ground fault relay can be tested while the distribution line is in the charged state.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a non-directional SOG grounding relay will be described with reference to the drawings.

As shown in FIG. 4, a switch 3 is fixed to an arm 2 attached to the upper part of a utility pole 1. A housing case 4 is provided below the utility pole 1, and a ground fault relay 5 is housed in the housing case 4. The ground fault relay 5 is connected to the switch 3 via control lines 6A to 6G. A portable ground fault characteristic tester 7 described later is detachably connected to the ground fault relay 5 via a connection cable 8.

As shown in FIG. 1, the switch 3 is an SOG
A high-voltage load switch of the type (with a ground fault trip with an overcurrent storage trip).
An opening / closing unit 10 that is opened / closed by an external operation handle (not shown) is provided on the distribution line 9 of each phase including the phase and the W phase. A trip coil 14 for automatically tripping the opening / closing section 10 is provided in the opening / closing section 10.

The trip operation means that when a ground fault current flows through the distribution line 9 due to a ground fault, the ground fault current of the distribution line 9 is detected, and when the current is equal to or more than a set value, the switching unit 10 is automatically turned on instantaneously. Opening to Then, when a ground fault current equal to or more than the set value flows through the distribution line 9, the trip coil 14 is excited, and the switching unit 10 is automatically opened.
Further, when a merger of a ground fault and an overcurrent occurs in the distribution line 9, the overcurrent accident is prioritized, the ground fault trip circuit is opened, and a circuit breaker of a substation (not shown) operates to distribute the fault. The electric wire 9 is opened after shifting to a non-charged state.

One end of the trip coil 14 is connected to an overcurrent lock relay 19 via a micro switch 18. The overcurrent lock relay 19 includes a pair of trip relays 20 and 21, and a common terminal 20 c of the trip relay 20 and a normally closed contact 21 of the other trip relay 21.
a is connected. When a current equal to or more than the overcurrent lock value flows in the U phase or the W phase, each trip relay 2
0, 21 actuators 20d, 21d are normally open contacts 2
0b and 21b can be connected. The actuator 18a of the microswitch 18 opens and closes in conjunction with the opening and closing operation of the opening and closing unit.

A zero-phase current transformer 25 for detecting U-phase, V-phase and W-phase zero-phase currents is provided on the distribution line 9. Around the iron core (not shown) of the zero-phase current transformer 25, when checking whether or not the operation of the ground-fault relay 5 is normal, a ground-fault test current is supplied to the zero-phase current transformer 25. Test line 26
Is wound.

The ground fault relay 5 has power supply terminals P 1, P
2 and terminals A1, B1, C1, W1, W2, D1, E1
, F1, G1 is provided, among the terminals of these terminals A1, C1, F1, G 1, as shown in FIG. 1, the receptacle terminal a, c in the female connector 27
g, h. In addition, in the connector 27
As shown in FIG. 1, each of the receptacle terminals b, g,
e, d and the receptacles terminals a, h, f, and forms a and the c <br/> pairs to each other to constitute a open portion at each of these pairs terminals.

The connection of the connector 27 will be described in more detail. The other end of the trip coil 14 is connected to a receptacle terminal b via a terminal A provided on the switch 3 and a control line 6A. Double trip relay 2
The normally open contacts 20b and 21b of 0 and 21 are connected to a terminal B1 via a terminal B provided on the switch 3 and a control line 6B. Common terminal 21c of the other trip relay 21
Is connected to a receptacle terminal d via a terminal C provided on the switch 3 and a control line 6C. Zero-phase current transformer 2
5 has a terminal D provided on the switch 3 and a control line 6.
It is connected to terminal D1 via D. Zero-phase current transformer 25
Is connected to a terminal E provided on the switch 3 and a control line 6E.
Is connected to the terminal E1.

As shown in FIG . 1, one end of the test line 26 is
Terminal F provided in the switch 3, the control line 6F, terminals F1 及
And to the receptacle terminal g via a lead wire 28e . The other end of the test line 26, terminal G provided in switch 3, the control line 6G, terminals G1 and the lead wire
28f, it is connected to the receptacle terminal h. And each terminal a, c, e, f of the connector 27
Are connected to the terminals A1, C1,.
It is connected to W1 and W2. The terminals A1 to E
1 is connected to a control circuit (not shown) provided in the ground fault relay 5.

The ground fault relay 5 is provided with a female connector 29 for power supply, and the connector 29 is provided with receptacle terminals i and j. The receptacle terminal i is connected to the power terminal P1 via a lead wire 30a. The receptacle terminal j is connected to the power terminal P2 via a lead wire 30b. The power supply terminals P1 and P2 are connected to AC10 provided in the switch case 3a.
It is connected to a 0 V power transformer (not shown) via a cable (not shown).

As shown in FIG. 2, the connection connector 27 of the ground fault relay 5 has a first control connector during a non-ground fault operation test, that is, in a normal state of monitoring a ground fault in a distribution line. A male connector 31 is detachably mounted. The connector 31 has plug terminals a2 to d.
2 are provided. Plug terminal a2 and plug terminal b
2 are connected to each other by a lead wire 38a. The plug terminal c2 and the plug terminal d2 are connected to each other by a lead wire 38b.

The connector 27 and the connector 3
1 is described. As shown in FIG. 6, the female housing 32 of the connector 27 is formed of a synthetic resin into a substantially rectangular cylindrical shape, and the front and rear surfaces of the female housing 32 are open. A partition plate 33 made of a synthetic resin is integrally formed on the inner side wall of the female housing 32. The partition plate 33 is composed of a horizontal plate 33a extending in the left-right direction of the female housing 32 and a plurality of vertical plates 33b extending in a direction orthogonal to the horizontal plate 33a. The horizontal plate 33a and the vertical plate 33b They are formed integrally with each other.

The left and right edges of the horizontal plate 33a are formed integrally with the inner surfaces of the left and right side walls of the female housing 32. The vertical plates 33b are arranged at regular intervals at equal intervals, and the upper and lower ends of the vertical plate 33b are formed integrally with the inner surfaces of the upper and lower side walls of the female housing 32. The portion surrounded by the side wall of the female housing 32 and the partition plate 33 is a plurality (eight in this embodiment) of insertion holes 34, and the insertion holes 34 include insertion cylinders 35 of the connecting connector 31 described later. Is to be inserted. The receptacle terminals a to h are accommodated in the respective insertion holes 34. Each of the receptacle terminals a to h is formed in a rectangular tube shape. The lead wires 28 are connected to the receptacle terminals a to h.
a to 28f, 6A and 6C are electrically connected.

The male housing 3 of the connecting connector 31
Reference numeral 6 denotes a base made of a synthetic resin, and a plurality of insertion tubes 35 (8 in this embodiment) extending forward from the front of the base 37.
) Are integrally formed from The base 37 is formed in a square tube shape, and its front and back surfaces are open. Each insertion tube 35 is formed in an elongated rectangular tube shape, and the opening at the distal end of the insertion tube 35 and the opening at the rear side of the male housing 36 communicate with each other. At the front of the base 37, the insertion tubes 35 are arranged in two rows vertically at predetermined intervals, and at the upper and lower stages, the insertion cylinders 35 are arranged in parallel at predetermined intervals.
Each insertion tube 35 can be inserted into the insertion hole 34 of the female housing 32.

Further, the insertion tube 35 of the connecting connector 31 which faces the receptacle terminals a to d of the connecting connector 27.
Inside, plug terminals a2 to d2 are accommodated. The plug terminals a2 to d2 are formed in the shape of a square tube,
Is inserted into the insertion hole 34, the receptacle terminal a becomes the plug terminal a2 and the receptacle terminal b becomes the plug terminal b2.
The receptacle terminal c is in contact with the plug terminal c2, and the receptacle terminal d is in contact with the plug terminal d2. The lead wires 38a and 38b are electrically connected to the plugs a2 to d2.

As shown in FIG. 5 to FIG.
A stopper 39 made of a synthetic resin is integrally formed on the upper surface of the upper side wall of the female housing 32 of FIG. The stopper 39 is a pair of guide plates 3 arranged at a predetermined interval.
9a and retaining plate 3 extending between guide plate 39a
9b. On the other hand, a locking tool 40 made of synthetic resin is integrally formed on the upper surface of the upper side wall of the base 37 of the connecting connector 31. The locking member 40 is composed of a support portion 41 having a bifurcated horizontal U-shape, and a claw portion 42 protruding in a cantilever shape from the distal end surface of the support portion 41.

At the tip of the claw portion 42, an inclined portion 42a is formed which is cut obliquely downward from above. And
The tip of the claw portion 42 swings up and down against the elastic force of the resin by the inclined portion 42a sliding rearward of the female housing 32 with respect to the front end surface of the retaining plate 39b. ing. Also, from the vicinity of the center of the claw portion 42, the support portion 41
An engagement concave portion 42b is formed over the distal end surface of the contact hole. When the retaining plate 39b is engaged in the engaging concave portion 42b, the stopper 40 is prevented from coming off from the stopper 39, and the female housing 32 of the connector 27 and the male housing 36 of the connector 31 are engaged. Are maintained in a connected state. FIG. 9 shows a state where the connecting connector 31 and the female connector 29 for power supply are mounted on the grounding relay 5.

As shown in FIG. 3, the ground fault characteristic tester 7
A plurality of connection cables 8 are detachably connected to the upper surface of the device via a plug 43. At the end of the connection cable 8, a male test connector 45 as a second control connector is provided. The test connector 45 is provided with plug terminals e1 to h1. Test connector 45
Can be connected to the connection connector 27 of the ground fault relay 5. Then, a ground fault test current flows from the ground fault characteristic tester 7 to the terminal F1 via the connection cable 8 and the plug terminal g1, and is output from the terminal F1 to the zero-phase current transformer 25. The test current flowing through the test line 26 of the zero-phase current transformer 25 and passing through the test line 26 is input to the terminal G1, and grounded via the lead wire 28f, the receptacle terminal h, the plug terminal h1, and the connection cable 8. It flows to the characteristic tester 7.

The terminals W1 and W2 of the ground fault relay 5
In the meantime, when the ground fault relay 5 performs a trip operation of outputting a trip signal to the trip coil 14 in response to the detection of a ground fault of the zero-phase current transformer 25, the operation follows the operation. The a contact for ON operation is connected. The terminal W1 is connected to an operation test circuit (not shown) of the ground fault characteristic tester 7 via the lead wire 28c, the receptacle terminal f, the plug terminal f1, and the connection cable 8. The terminal W2 is connected to an operation test circuit of the ground fault characteristic tester 7 (not shown) through a lead wire 28d, a receptacle terminal e, a plug terminal e1, and a connection line 8. The operation test circuit (not shown) receives the ON signal of the a-contact and makes the signal correspond to the test current output from the same ground fault characteristic tester 7 to the test line 26 of the zero-phase current transformer 25, The required time from the test current output to the trip operation of the ground fault relay 5 is measured, and it is determined whether or not to operate within a predetermined operation time, and it is determined whether or not the ground fault relay 5 is operating normally. The operation time is displayed on the liquid crystal display unit 7a while being displayed on the display unit provided in the short-circuit characteristic tester 7.

The connection structure between the test connector 45 and the connection connector 27 will be described. However, the connection connector 31
The description of the same components will be omitted, the same reference numerals will be given, and only different components will be described.

As shown in FIG. 5, each of the insertion tubes 35 of the test connector 45 accommodates plug terminals e 1 to h 1. The plug terminals e 1 to h 1 have the same shape as the plug terminals a 2 to d 2 of the connecting connector 31. Then, the insertion tube 35 of the test connector 45 is inserted into the insertion hole 3 of the connection connector 27.
4, the plug terminals e 1 to h 1 can be inserted into the receptacle terminals a to h of the connector 27. At the time of this insertion, each of the receptacle terminals e to
h and the plug terminals e1 to h1 are in contact with each other.

The end of the cable 8 excluding the insulation coating is crimped to the rear of the plug terminals e1 to h1 .
The respective cables of the cables 8 are electrically connected to the respective plug terminals e1 to h1.

A power supply cable 46 is detachably connected to the ground fault characteristic tester 7 via a plug 44, and a power supply male connector 47 is provided at the end of the power supply cable 46. ing. Male connector 47 for power supply
Are provided with plug terminals i1, j1. And
The power supply male connector 47 is connectable to the power supply female connector 29 of the ground fault relay 5.

The connection structure between the female connector 29 for power supply and the male connector 47 for power supply will be described. However, the description of the same components as those of the connection connector 31 will be omitted, the same reference numerals will be given, and only different components will be described.

As shown in FIG. 7, the power supply female connector 2
Nine female housings 48 are formed in a substantially rectangular tube shape with synthetic resin, and the front and rear surfaces of the female housing 48 are open. A partition plate 49 made of a synthetic resin is integrally formed on the inner side wall of the female housing 48. The portion surrounded by the side wall of the female housing 48 and the partition plate 49 is a plurality (two in this embodiment) of insertion holes 50, and the insertion holes 50 are provided with a male connector 47 for power supply described later.
Of the insertion tube 51 is inserted. The receptacle terminals i and j are accommodated in the respective insertion holes 50. Each receptacle terminal i, j has the same shape as the receptacle terminals a to h. The ends of the power supply cable 46 excluding the insulating coating are plug terminals i 1 , j
1 at the rear.

The male housing 52 of the power supply male connector 47 is made of synthetic resin, and has a base 53 and the base 53.
Are formed integrally with a plurality of insertion tubes 51 (two in this embodiment) extending from the front to the front. The base 53 is formed in a square tubular shape, and its front and back surfaces are open.
Each insertion tube 51 is formed in an elongated rectangular tube shape.
And the opening on the back side of the male housing 52 are in communication with each other. On the front surface of the base 53, the insertion tubes 51 are arranged side by side at predetermined intervals. Each insertion tube 51 can be inserted into the insertion hole 50 of the female housing 48.

The male connector 47 for the power supply is located opposite the receptacle terminals i and j of the female connector 29 for the power supply.
In the insertion tube 51, plug terminals i1, j1 are accommodated. The plug terminals i1, j1 are connected to the connector 31.
Has the same shape as the plug terminals a2 to d2. When the insertion tube 51 of the power supply male connector 47 is inserted into the insertion hole 50 of the power supply female connector 29, the plug terminal i1
, J1 can be inserted into receptacle terminals i, j of the female connector 29 for power supply. At the time of this insertion, the receptacle terminal i and the plug terminal i1, the receptacle terminal j and the plug terminal j1 come into contact with each other.
The power supply cable 46 is electrically connected to the plug terminals i1 and j1. The distal end of the power supply cable 46, excluding the insulating coating, is crimped to the rear of the plug terminals i1 to j1.

FIG. 9 is a view showing a state in which the connecting connector 27, the connecting connector 31, and the female connector 29 for the power supply have been attached to the existing ground fault relay 5 in a normal state. In this case, since the female connector for power supply 29 is in an unused state, each receptacle terminal i, j is covered with a blind lid M.

Next, the connector 27 and the power supply female connector 29 of the ground fault relay 5 configured as described above,
The operation when a ground fault trip operation test is performed using each of the male connectors 31, 45, and 47 and the ground fault characteristic tester 7 will be described. Before the ground fault trip operation test is performed, the connection connector 31 is connected to the connection connector 27 of the ground fault relay 5. That is, the receptacle terminal a
Is a plug terminal a2, a lead wire 38a and a plug terminal b2.
Is connected to the receptacle terminal b. Also,
Receptacle terminal c is plug terminal c2, lead wire 38b
And the plug terminal d2 is connected to the receptacle terminal d.

[0037] First, the communication from the connector 27 by the operator
The male housing 36 of the connector 31 is removed. In performing this removal, the tip of the claw portion 42 is pressed downward, and is bent as shown by the two-dot chain line in FIG. Claw part 42
Of the retaining plate 39b and the engagement recess 42
The engagement with the connector b is released, and the connection connector 31 can be pulled out of the connection connector 27. In this state, when the connection connector 31 is pulled out from the connection connector 27, the insertion tube 35 of the connection connector 31 is pulled out from the insertion hole 34 of the connection connector 27. At the same time, the plug terminals a2 to d2 are pulled out from the receptacle terminals a to d.
As a result, the connection between the plug terminals a2 to d2 and the receptacle terminals a to d is released.

Next, the test connector 45 is connected to the connection connector 27 of the ground fault relay 5 by an operator. In making this connection, the insertion tube 35 of the test connector 45 is inserted into the insertion hole 34 of the connection connector 27. At the same time, the plug terminals e1 to h1 of the test connector 45 are inserted into the receptacle terminals e to h of the connector 27, respectively, and connected to the receptacle terminals e to h.
With this connection, a state is opened between the receptacle terminal a and the receptacle terminal b and between the receptacle terminal c and the receptacle terminal d.

Further, when the insertion tube 35 is inserted into the insertion hole 34, the inclined portion 42 a of the claw portion 42 slides on the front end surface of the stopper plate 39 b of the stopper 39. Due to this sliding,
The tip of the claw portion 42 is bent downward as shown by a two-dot chain line in FIG. 8 against the elastic force. The bent state of the claw portion 42 is maintained by the upper surface of the claw portion 42 abutting against the lower surface of the retaining plate 39b. And the claw part 42 is inserted
Is moved by a predetermined amount in the moving direction, the claw portion 42 returns to its original position by its elastic force, and the engagement concave portion 42b is engaged with the retaining plate 39b. By this engagement, the test connector 45 is connected and held to the connection connector 27 of the ground fault relay 5. After that, the pair of plugs 43 is connected to the ground fault characteristic tester 7. With this connection, the receptacle terminals e to h of the connector 27 are connected to the operation test control circuit (not shown) of the ground fault characteristic tester 7 via the plug terminals e 1 to h 1 of the test connector 45, the connection cable 8 and the plug 43. Connected.

Subsequently, a female connector 2 for power supply is provided by an operator.
9, the blind lid M is removed, and the power supply female connector 29 is connected to the power supply male connector 47. In making this connection, the insertion hole 50 of the female connector 29 for power supply
The insertion tube 51 of the power male connector 47 is inserted. At the same time, the plug terminals i1 and j1 of the power male connector 47 are inserted into the receptacle terminals i and j of the power female connector 29, and both terminals i and i1 and both terminals j and j are inserted.
j1 are connected to each other.

Further, when the insertion tube 51 is inserted into the insertion hole 50, the inclined portion 42a of the claw portion 42 slides on the front end surface of the stopper plate 39b of the stopper 39. Due to this sliding,
The tip of the claw portion 42 is bent downward as shown by a two-dot chain line in FIG. 8 against the elastic force. The bent state of the claw portion 42 is maintained by the upper surface of the claw portion 42 abutting against the lower surface of the retaining plate 39b. And the claw part 42 is inserted
Is moved by a predetermined amount in the moving direction, the claw portion 42 returns to its original position by its elastic force, and the engagement concave portion 42b is engaged with the retaining plate 39b. By this engagement, the power supply male connector 47 is connected and held to the power supply female connector 29.

Thereafter, the plug 44 is connected to the ground fault characteristic tester 7. With this connection, the power supply terminal P1 is connected to the lead wire 30a, the receptacle terminal i of the power supply female connector 29, the plug terminal i1 of the power supply male connector 47, the power supply cable 46, and the plug 44 to conduct a ground fault characteristic test. Connected to the vessel 7. The power supply terminal P2 is connected to the lead wire 3
0b, receptacle terminal j of female connector 29 for power supply,
The ground fault characteristic tester 7 is connected via the plug terminal j1 of the power supply female connector 47, the power supply cable 46 and the plug 44.
Connected to. Therefore, the control power supply of the ground fault characteristic tester 7 can be more easily secured than the ground fault relay 5 to be tested.

Next, a test as to whether or not the ground fault trip operation is performed normally will be described. First, the setting switch 54 provided on the ground fault relay 5 is operated as a condition before the start of the test with respect to the zero-phase current transformer 25 mounted on the distribution line 9 in the state of aeration, and for example, a ground fault current setting tap is set. 0.2A
Set to. Further, by operating a setting switch (not shown) of the ground fault characteristic tester 7, the input value of the ground fault test current is set to 400% of the ground fault current setting tap (8.0 A).

An operator turns on a test start switch (not shown) of the ground fault characteristic tester 7 by an operator. Then, a ground fault test current of 8.0 A is supplied from the ground fault characteristic tester 7 to the connection cable 8, the plug terminal g1, the receptacle terminal g, and the lead wire 2.
8e, the terminal F 1, flowing through the test line 26 via a control line 6F and the terminal F. And the ground fault test current is zero phase current transformer 25.
Through terminal G, control line 6G, terminal G1, lead wire 2.
8f, the receptacle terminal h, the plug terminal h1, and the connection cable 8 to the ground fault characteristic tester 7.

At this time, the ground fault test current value is displayed on the liquid crystal display section 7a of the ground fault characteristic tester 7. Zero-phase current transformer 25
, The ground fault test current is detected by the zero-phase current transformer 25. Then, a current of 19.4 mmA based on the ground fault test current detected by the zero-phase current transformer 25 flows between the terminals D1 and E1 of the ground fault relay 5. Then, the control circuit (not shown) of the earth絡継collector 5, and generates a trip power source (140 V in this embodiment), as well as applied to the output terminal A 1 and the terminal C1 to the trip coil,
With this operation, the terminal W1 and the terminal W2 are connected in series.
Turn ON the contact. At this time, needless to say, by exchanging the connection connector 31 as the first control connector and the test connector 45, the connection between the receptacle terminals a and b and the connection between cd and c constituting the trip circuit of the switch of the connection connector 27 are opened. This test does not cause the switch to trip open operation and does not cause a power outage to the distribution line.

Then, the operation test control circuit of the ground fault characteristic tester 7 operates the circuit, and then the zero- phase current transformer 25 of the ground fault relay 5 detects the test current, and this ground fault relay 5 The trip operation time until the operation (a contact is closed) is measured. At this time, the trip operation time is displayed on the liquid crystal display unit 7a of the ground fault characteristic tester 7. Then, the operator reads the trip time and determines whether the ground fault trip operation of the ground fault relay 5 is performed normally. If the trip operation time is within 0.1 to 0.2 seconds, it is determined that the ground fault trip operation has been performed normally.

As described above, after the ground fault trip operation test is completed, the male power connector 47 is detached from the female connector 29 by the operator. In performing this removal, the tip of the claw portion 42 is pressed downward, and is bent as shown by a two-dot chain line in FIG. By bending the claw portion 42, the engagement between the retaining plate 39b and the engagement concave portion 42b is released, and the female connector 29 for power supply and the male connector 4 for power supply are released.
7 can be pulled out. In this state, when the male power connector 47 is pulled out from the female power connector 29, the insertion tube 51 of the male power connector 47 is pulled out from the insertion hole 50 of the female power connector 29. At the same time, the receptacle terminals i, j to the plug terminals i1, j
1 is pulled out. As a result, each plug terminal i1, j1
Is disconnected from the receptacle terminals i and j.

Subsequently, the test connector 45 is detached from the connection connector 27 by an operator. In performing this removal, the tip of the claw portion 42 is pressed downward, and is bent as shown by the two-dot chain line in FIG. By bending the claw portion 42, the engagement between the retaining plate 39b and the engagement concave portion 42b is released, and the test connector 45 can be pulled out from the connection connector 27. In this state, when the test connector 45 is pulled out from the connection connector 27, the insertion tube 35 of the test connector 45 is pulled out from the insertion hole 34 of the connection connector 27. At the same time, the plug terminals e1 to h1 are pulled out from the receptacle terminals e to h. As a result, the connection between each of the plug terminals e1 to h1 and each of the receptacle terminals e to h is released.

Thereafter, the connection connector 31 is connected to the connection connector 27 by an operator. In making this connection, the insertion tube 35 of the connection connector 31 is inserted into the insertion hole 34 of the connection connector 27. At the same time, the plug terminals a2 to d2 of the connection connector 31 are inserted into the receptacle terminals a to d of the connection connector 27, respectively. As a result, the plug terminals a2 to d2 are connected to the receptacle terminals a to d.

Further, in the same manner as described in connection between the connection connector 27 and the test connector 45, the locking member 40 of the connection connector 31 is locked to the stopper 39 of the connection connector 27 of the ground fault relay 5. Is done. By this locking, the connection connector 27 and the connection connector 31 are connected and held. The plug terminals a1 to d1 of the connection connector 31 are connected to the receptacle terminals a to d of the connection connector 27, respectively.
Is connected.

Therefore, the receptacle terminals a to h for connecting the connection cable 8 from the outside are connected to the connection connector 27.
Provided within. At the same time, a test connector 45 detachable from the connection connector 27 is provided at the end of the plurality of connection cables 8. With this configuration, the test connector 45
When the ground fault operation test is performed by using the connector, only the test connector 45 is connected to the connection connector 27, so that the operator does not need to connect the connection cables 8 to the terminals e to h one by one. Therefore, the connection work as described above can be easily performed regardless of the skill level of the operator, and the connection mistake of the connection cable 8 can be eliminated.
Moreover, since the connection time of the connection cable 8 can be reduced,
The time required for the ground fault operation test can be reduced.

Further, the connection connector 31 can be attached to and detached from the connection connector 27 during the non-grounding test. Therefore, the operator does not need to connect the lead wires 28a and 28b, and the common terminal 21c between the other end of the trip coil 14 in the switch 3 and the terminal A1 of the ground fault relay 5 and the trip relay 21 is used. And between the terminals C1 of the ground fault relays 5 can be easily short-circuited.

The present invention may be appropriately modified as follows. (1) Connector 27 on front panel P of ground fault relay 5
Is fixed, and at the time of non-test, an insulating cap provided with a short-circuiting piece is placed so as to short-circuit between the plugs a2 and b2 and between the plugs c2 and d2 as in the above embodiment. The power supply for the female connector 29 has also been fixed to the front panel P similar, so covered with the insulating cap.

(2) In the above embodiment, each of the plug terminals e1 to h1 of the test connector 45 is connected to the ground fault characteristic tester 7 through a plurality of connection cables 8, but the connection cable 8 is omitted and the ground fault is omitted. The structure may be such that the test connector 45 is directly attached to the characteristic tester 7.

(3) The connecting connector 27 may be a male connector, the test connector 45 may be a female terminal, and the connecting connector 31 may be changed to a female terminal. (4) In the above embodiment, the plug terminal e is connected to the test connector 45.
Although only 1, 1, f1, g1, and h1 are arranged, if it is desired to load data such as a trip signal output into a tester as another test, test the plug terminals connected to the receptacle terminals a and c. By arranging it on the connector 45, it is possible to easily cope with it.

(5) The connector 27 of the above embodiment is used for connection to a ground fault characteristic tester. The receptacle terminals b and d of the connector 27 are used and connected to the receptacle terminals b and d. By detaching the connector 31 and then connecting a separately provided megger connector, the insulation resistance of the trip signal circuit can be easily measured, and it can be used for measuring and monitoring the insulation state.

[0057]

As described above in detail, according to the first aspect of the present invention, the terminal of the ground fault relay is connected to the ground fault by replacing the first control connector for normal use and the second control connector for test use. This eliminates the work of attaching and detaching individual control lines in the work of connecting to the characteristic tester, thereby simplifying the connection work and eliminating connection errors. Further, the trip circuit of the switch at the time of the test is surely shut off, erroneous opening of the switch accompanying the ground fault characteristic test is avoided, and the power distribution line is not stopped. Further, according to the invention of claim 2, according to claim 1,
In addition to the effects of the invention, the ground fault characteristic tester
Ensure that the control power supply is easier than the ground fault relay to be tested.
Can be.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a connection between a switch and a ground fault relay in one embodiment.

FIG. 2 is a schematic explanatory view showing a male connector of a first control connector.

FIG. 3 is a schematic explanatory view showing a ground fault characteristic tester, a male connector of a second control connector, and a male connector for a power supply.

FIG. 4 is an explanatory diagram showing a state in which a switch and a ground fault relay are attached to a utility pole.

FIG. 5 is an exploded perspective view of a male connector and a female connector of the second control connector.

FIG. 6 is an exploded perspective view of a male connector and a female connector of the first control connector.

FIG. 7 is an exploded perspective view of a male power connector and a female power connector.

FIG. 8 is a side view showing a connection state of the male connector and the female connector.

FIG. 9 is a front view showing a use state of the connector.

[Explanation of symbols]

3 ... Switch, 7 ... Ground fault characteristic tester, 9 ... Distribution line, 14 ...
Trip coil , 25: Zero-phase current transformer, 27: Connector, 29: Female connector for power supply (connector for power supply), 3
1: Connection connector (first control connector), 45: Test connector (second control connector), 47: Male connector for power supply
Connectors (power supply connector), ah ... receptacle terminals (open circuit).

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Eiji Komiya 1st character small needle in Inuyama City, Aichi Prefecture Energy Support Co., Ltd. (72) Inventor Gen Moto Ito 1st character small character in Inuyama City, Aichi Prefecture Energy Support Corporation ( 56) References JP-A-52-112745 (JP, A) JP-A-63-16523 (JP, A) JP-A-4-342917 (JP, A) JP-A-59-117417 (JP, A) 63-93730 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02J 13/00 301 H02H 3/05 H01H 83/02 H01H 73/00 H01H 33/59

Claims (2)

(57) [Claims] 1. A receives an input via a detection signal from the zero-phase current transformer provided on the distribution line control line, trip against trip means provided in the switch based on the detection result of the signal A ground fault relay having a control circuit that outputs a signal through a control line and controls trip operation of a switch, wherein an input terminal and an output terminal are connected to each other in the middle of the control circuit.
A connection connector having a plurality of pairs of terminal groups is provided,
To the connector, each terminal at the time of connection
A first control connector for shorting the open portion between the terminals constituting the Chi trip circuit, the open circuit portion at the time of connecting the open circuit
And passes through the zero-phase current transformer through another terminal
A ground fault relay, wherein a test line of a ground fault characteristic tester is connected to a second control connector for connection to a test line as appropriate. 2. A power supply connector of the ground fault characteristic tester.
Power supply connector that can hold
When connecting the ground fault relay to the ground fault tester
The ground fault according to claim 1, wherein power is supplied.
relay.