JPH0567114U - Closed switchboard - Google Patents

Abstract

(57) [Summary] [Purpose] Partial discharge can be easily measured even with external noise. [Structure] A partial discharge monitoring device 17 is provided in a closed switchboard 1 composed of a main circuit device and a monitoring control device, and this partial discharge monitoring device is connected to a high-voltage circuit 14 by a detector insulator 1
The output terminal of 2 is provided with an indicator for voltage detection and impedance 8 for detecting partial discharge, and it is possible to perform voltage detection and partial discharge measurement by using the capacitor 13 constituting the above-mentioned voltage insulator.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a closed switchboard for predictive maintenance of insulation of high voltage equipment during operation.

[0002]

[Prior Art]

 Conventionally, this type of closed switchboard is constructed as shown in FIG. In FIG. 3, 1 is a closed switchboard that accommodates main circuit devices such as circuit breakers, disconnectors, and transformers for instruments, and a supervisory control device that performs supervisory control of circuit breakers, disconnectors, and the like, and 2 is outside the closed switchboard 1. A grounding metal box to be covered, and this grounding metal box 2 is placed on an insulating plate 3. Reference numeral 4 is a ground wire connected to the ground metal box 2 and taken out, 5 is a high frequency current transformer attached to the ground wire 4, and 6 is a partial discharge measurement for detecting a high frequency pulse from the high frequency current transformer 5. It is a container.

Next, the operation will be described. For the partial discharge monitoring of the closed switchboard 1, the ground metal box 2 is insulated from the ground, the ground wire 4 is connected to the ground metal box 2, and the high frequency current transformer 5 is attached to the ground wire 4 to generate the partial discharge high frequency pulse. The partial discharge measuring device 6 detects the partial discharge to monitor the partial discharge.

[0004]

[Problems to be solved by the device]

 Since the conventional closed switchboard is configured as described above, there is a risk that external noise may jump into the ground metal box 2, and the high frequency current transformer attached to the ground wire 4 connected to this ground metal box 2 Since the external noise is superposed on the container 5, there is a problem that it is dangerous.

The present invention has been made to solve the above problems, and an object thereof is to obtain a closed switchboard which can easily measure partial discharge even with respect to external noise.

[0006]

[Means for Solving the Problems]

 The closed switchboard according to the present invention is provided with a detection indicator and a partial discharge detection impedance at the output terminal of the detection insulator connected to the high voltage circuit, and the detection and partial detection are performed by using the capacitor that constitutes the above detection insulator. The discharge can be measured.

[0007]

[Action]

 The closed switchboard according to the present invention uses the capacitor of the detector, and is configured to perform the detection and the partial discharge measurement by the indicator for detection provided at the output terminal of the detector and the impedance for detecting partial discharge. Is.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram showing a closed switchboard. In FIG. 1, 8 is a partial discharge detection impedance, 9 is a push switch, and this push switch 9 Is attached to the front door 10 of the closed switchboard 1. Reference numeral 11 denotes a voltage-detecting neon lamp, and this voltage-detecting neon lamp 11 is also attached to the front door 10. Reference numeral 12 is a detector insulator with a built-in capacitor 13, and the detector insulator 12 is connected between the high voltage circuit 14 of the closed switchboard 1 and the partial discharge detection terminal 15. Reference numeral 16 is a varistor used for short-circuit protection of the detection terminal, and the varistor 16, the partial discharge detection impedance 8, the push switch 9 and the detection neon lamp 11 constitute a partial discharge monitoring device 17. Reference numeral 18 denotes a partial discharge measuring instrument, and this partial discharge measuring instrument 18 is connected to a partial discharge measuring terminal 22 2 drawn out from both ends of the partial discharge detecting impedance 8. The partial discharge measuring terminal 22 is provided on the front door 10.

As shown in FIG. 2, the main circuit device of the closed switchboard 1 is composed of a drawer type vacuum shutoff device 19 and a shutter opening / closing mechanism 20, and the monitoring control device is composed of a partial discharge monitoring device 17 and the like. ing. Reference numeral 21 is a vacuum circuit breaker, and this vacuum circuit breaker 21 constitutes a drawer type vacuum circuit breaker 19.

Next, the operation will be described. Normally, the capacitor 13 in the detector insulator 12 is grounded through the push switch 9 and the inductance L of the partial discharge detection impedance 8.

When the closed switchboard 1 is used for power detection, the push switch 9 is pushed to open the switch and voltage is applied to the power detection neon lamp 11. You can check the voltage by turning on (charging).

When performing the partial discharge measurement using the closed switchboard 1, the partial discharge measuring instrument 18 is connected to the partial discharge measuring terminal 22 and the partial discharge measurement is performed.

[0013]

[Effect of the device]

 As described above, according to the present invention, a detection indicator and a partial discharge detection impedance are provided at the output terminal of the detection insulator connected to the high voltage circuit, and the detection is performed by using the capacitor of the detection insulator. Since the configuration enables the measurement of electric discharge and partial discharge, there is an effect that the partial discharge can be easily measured even with respect to external noise.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a partial discharge monitoring device for a closed switchboard according to the present invention,

FIG. 2 is a cross-sectional view showing a schematic configuration of a closed switchboard,

FIG. 3 is a schematic configuration diagram showing an example of a conventional closed switchboard.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Closed switchboard, 8 ... Impedance for partial discharge detection 11 ... Neon lamp for detection 12 ... Insulator, 13 ... Capacitor, 14 ... High voltage circuit, 15 ... Terminal for partial discharge detection, 18 ... Partial discharge measuring instrument, 22 ... Terminal for measuring partial discharge.

Claims (1)

[Scope of utility model registration request] 1. A detection indicator provided on an output terminal of a detection insulator connected to a high-voltage circuit, for detecting electricity using the capacitor of the detection insulator, and a capacitor of the detection insulator. And a partial discharge detection impedance for performing partial discharge measurement, and it is possible to perform electric detection and partial discharge measurement by using the capacitor of the electric detection insulator.