JBS-15 type PT wire breaking locking relayDetailed product description：

Application of JBS-15 PT Disconnecting Lock Relay:

The JBS-15 PT disconnection blocking relay is mainly used for voltage transformer PT secondary circuit disconnection blocking. When one or two phases of the PT secondary circuit are disconnected, the relay can quickly block the protection device.
This relay is composed of integrated circuits and has the characteristics of high sensitivity, fast speed, and low power consumption. When one or two phases of PT break, the relay operates correctly and the action indicator light is on. When the PT opening triangle shows 3Uo, it can prevent the disconnection locking relay from acting.

Working Principle:
The principle block diagram is shown in Figure 1. The voltages Ua, Ub, Uc, and Un of the PT secondary star winding are applied to the star connection circuit composed of capacitors and YH1 to monitor the integrity of the PT. When one or two phases of the PT secondary circuit are disconnected, YH1 provides voltage output to prompt J1 to operate.
YH2 is connected to the open delta winding of PT. When there is voltage output from the open delta winding, J2 is activated and J1 relay is locked to prevent accidental tripping of the disconnection locking device in case of system short circuit fault.



Main technical parameters:
5.1 AC rated value: Star connection three-phase line voltage: 100V, 50Hz
Open delta rated voltage: 100V, 50Hz.
5.2 Auxiliary DC voltage: 110V or 220V.
5.3 Sensitivity coefficient: When one or two phases of a star wire are disconnected, the sensitivity coefficient shall not be less than 3.
5.4 Allowable ambient temperature: -10 ℃ to+55 ℃.
5.5 AC/DC power consumption AC power consumption: ≤ 1VA per phase at rated voltage 100V; DC power consumption: 110V<3W, 220V<3W.
5.6 Contact breaking capacity
a) DC circuit: Under the conditions of current not exceeding 1A and voltage not exceeding 250V, the external output contact can disconnect a DC inductive load of 30W with a time constant of 5ms ± 0.75ms.
b) AC voltage: Under the conditions of current not exceeding 1A and voltage not exceeding 250V, the external output contact can disconnect the load of the circuit with a power factor coso of 0.4 ± 0.1, which is 250VA.
The conductive circuits of the 5.7 dielectric strength relay should be able to withstand an AC test voltage of 2kV (effective value) and 50Hz between the exposed non charged metal parts and the casing, as well as between the input circuit and the contacts, for a duration of 1 minute without insulation breakdown or flashover.
5.8 Working conditions
a) The usage location does not allow explosive media, and the surrounding media should not contain corrosive metals, gases that damage insulation, or conductive media. It is not allowed to be filled with water vapor or have serious mold presence;
b) Strong vibrations and impacts are not allowed in the usage location;
c) The usage location should have facilities to defend against rain, snow, wind, and sand;
d) The usage location does not allow an external magnetic induction intensity exceeding 1.5mT.
5.9 Electrical anti-interference relays shall comply with GB7261 and GB6261 "Electrical anti-interference tests for static relays and protective devices".

Wiring diagram behind the relay:

Relay external dimensions and opening dimensions:
Refer to Figures 4 and 8 in the protruding modular insertion structure.

Ordering instructions:
7.1 Product model, name, and structural form.
7.2 Order Quantity.
7.3 Relay matching: such as base, socket, etc. (must be ordered separately).

JBS-15 type PT wire breaking locking relay（No image available）